summaryrefslogblamecommitdiffstats
path: root/drivers/scsi/ncr53c8xx.c
blob: d013a2aa2fd54aac8e6d251f4aa2267ebe669922 (plain) (tree)
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609






































































                                                                                



                                                                       




















                                                                               



                              
                      



















                            
                          






                                    

                                           
























































                                                                    
                                                    






















































































































































































































































































































































                                                                                
                                    




                               



                                                                        

                                   

                         






                                                                       














                                                                        
              



                                                                     
                    















































                                                                     






                   


















                                            















                                                                
























































































































                                                                                                                 
                    























































                                                                     

































































































































































































































































































































































































































































































































































































                                                                                     
                                                                


























































                                                            
                                                































































































































































































































































































































































































































































































































































































































                                                                                                          
                                                                          

















































                                                                    
                                               



























                                                                 
                                     






















































































































































                                                                            
                                                    
                                 
                                              
                                   
                                                 
                                
                                                    
                                   
                                                    
                                      
                                       
                               
                                                  
                                    
                                                       













                                                             
                                                






























































































































































































                                                                
                                                  










                                                              
                                     









































































































































































































































































































































































































































































                                                                     
                                                 
































                                                             
                                      


















                                                             
                                                 

































                                                             
                                      












































































                                                                
                                                            

                                        
                                            






                                                               
                                            






                                                               
                                                














































































































                                                                              
                                                                  










                                                               
                                               








                                                               
                                           









                                                               
                                     















































































































































































































































































































































                                                                                                      

                                           

                           

















































































































































































































































































































































































































                                                                                       

                                                                            

                      
                                                                               
















































































                                                                               

                                                                     
                                                        















                                                              
                                       















                                                                          
                                                                
                                            
                                                          




                                                                                
                                                        










                                                                      
                                                         

                                      
                                                          
































































































































                                                                                   
                                                        

























































































































                                                                                      
                                                      































































































































































































































































































































































































































































































                                                                                    

                                                           

                                                              
                                                      






















































































































                                                                         
                                                 









                                                                 
                                                               
























































































































































































































































































































































                                                                                   
                         
































































                                                                             
                                                         






















                                                                                     
                                               
























































                                                                                 
                                               












































































































































                                                                                
                                   











                                                                  
                                                              































































































































                                                                                            

                                                             



















































































































































                                                                               

                                               


















































































































                                                                     
                                               





















































                                                                                    
                                       
            
                                      





































































































































































































































































































                                                                                         
                                                                     











































































































































































































































































                                                                                

                                                                     









                                                                   
                                                             

























































































                                                                               

                                    




























































































                                                                                  
                                                            









                                                                     
                                    









































































                                                                                 
                                                         
 
                                    

















                                                                      
                                                     



                                                                 
                                                                         










                                                                          
                                                                        

















                                                                      
                                                                                











                                                                 
                                                                           






































































































































































































































































































































































































































































































                                                                                
                                                




































                                                               


                                                                             
                                             


                            


                                           








                                                            


                                                              



                                                                      
              
                             































































































































                                                                               
                                       









































































































































































































































































                                                                                             
                                                 











































































                                                                                 
                                                                         


                                





































                                                                                       
                                       


































                                                                                                                       
                                               



















                                                                                     

                                                                                






                                                                         
                                                          



                                                           
                                                          














                                                            
              




                                            



































































































































                                                                                                                           




















































































                                                                                                                             
                                     



























                                                                            
                                              
 
                                                       


                                       
                           
                                           
                            


























































































                                                                                            
/******************************************************************************
**  Device driver for the PCI-SCSI NCR538XX controller family.
**
**  Copyright (C) 1994  Wolfgang Stanglmeier
**
**  This program is free software; you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation; either version 2 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software
**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
**
**  This driver has been ported to Linux from the FreeBSD NCR53C8XX driver
**  and is currently maintained by
**
**          Gerard Roudier              <groudier@free.fr>
**
**  Being given that this driver originates from the FreeBSD version, and
**  in order to keep synergy on both, any suggested enhancements and corrections
**  received on Linux are automatically a potential candidate for the FreeBSD 
**  version.
**
**  The original driver has been written for 386bsd and FreeBSD by
**          Wolfgang Stanglmeier        <wolf@cologne.de>
**          Stefan Esser                <se@mi.Uni-Koeln.de>
**
**  And has been ported to NetBSD by
**          Charles M. Hannum           <mycroft@gnu.ai.mit.edu>
**
**-----------------------------------------------------------------------------
**
**                     Brief history
**
**  December 10 1995 by Gerard Roudier:
**     Initial port to Linux.
**
**  June 23 1996 by Gerard Roudier:
**     Support for 64 bits architectures (Alpha).
**
**  November 30 1996 by Gerard Roudier:
**     Support for Fast-20 scsi.
**     Support for large DMA fifo and 128 dwords bursting.
**
**  February 27 1997 by Gerard Roudier:
**     Support for Fast-40 scsi.
**     Support for on-Board RAM.
**
**  May 3 1997 by Gerard Roudier:
**     Full support for scsi scripts instructions pre-fetching.
**
**  May 19 1997 by Richard Waltham <dormouse@farsrobt.demon.co.uk>:
**     Support for NvRAM detection and reading.
**
**  August 18 1997 by Cort <cort@cs.nmt.edu>:
**     Support for Power/PC (Big Endian).
**
**  June 20 1998 by Gerard Roudier
**     Support for up to 64 tags per lun.
**     O(1) everywhere (C and SCRIPTS) for normal cases.
**     Low PCI traffic for command handling when on-chip RAM is present.
**     Aggressive SCSI SCRIPTS optimizations.
**
**  2005 by Matthew Wilcox and James Bottomley
**     PCI-ectomy.  This driver now supports only the 720 chip (see the
**     NCR_Q720 and zalon drivers for the bus probe logic).
**
*******************************************************************************
*/

/*
**	Supported SCSI-II features:
**	    Synchronous negotiation
**	    Wide negotiation        (depends on the NCR Chip)
**	    Enable disconnection
**	    Tagged command queuing
**	    Parity checking
**	    Etc...
**
**	Supported NCR/SYMBIOS chips:
**		53C720		(Wide,   Fast SCSI-2, intfly problems)
*/

/* Name and version of the driver */
#define SCSI_NCR_DRIVER_NAME	"ncr53c8xx-3.4.3g"

#define SCSI_NCR_DEBUG_FLAGS	(0)

#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/types.h>

#include <asm/dma.h>
#include <asm/io.h>
#include <asm/system.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>

#include "ncr53c8xx.h"

#define NAME53C8XX		"ncr53c8xx"

/*==========================================================
**
**	Debugging tags
**
**==========================================================
*/

#define DEBUG_ALLOC    (0x0001)
#define DEBUG_PHASE    (0x0002)
#define DEBUG_QUEUE    (0x0008)
#define DEBUG_RESULT   (0x0010)
#define DEBUG_POINTER  (0x0020)
#define DEBUG_SCRIPT   (0x0040)
#define DEBUG_TINY     (0x0080)
#define DEBUG_TIMING   (0x0100)
#define DEBUG_NEGO     (0x0200)
#define DEBUG_TAGS     (0x0400)
#define DEBUG_SCATTER  (0x0800)
#define DEBUG_IC        (0x1000)

/*
**    Enable/Disable debug messages.
**    Can be changed at runtime too.
*/

#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
static int ncr_debug = SCSI_NCR_DEBUG_FLAGS;
	#define DEBUG_FLAGS ncr_debug
#else
	#define DEBUG_FLAGS	SCSI_NCR_DEBUG_FLAGS
#endif

static inline struct list_head *ncr_list_pop(struct list_head *head)
{
	if (!list_empty(head)) {
		struct list_head *elem = head->next;

		list_del(elem);
		return elem;
	}

	return NULL;
}

/*==========================================================
**
**	Simple power of two buddy-like allocator.
**
**	This simple code is not intended to be fast, but to 
**	provide power of 2 aligned memory allocations.
**	Since the SCRIPTS processor only supplies 8 bit 
**	arithmetic, this allocator allows simple and fast 
**	address calculations  from the SCRIPTS code.
**	In addition, cache line alignment is guaranteed for 
**	power of 2 cache line size.
**	Enhanced in linux-2.3.44 to provide a memory pool 
**	per pcidev to support dynamic dma mapping. (I would 
**	have preferred a real bus abstraction, btw).
**
**==========================================================
*/

#define MEMO_SHIFT	4	/* 16 bytes minimum memory chunk */
#if PAGE_SIZE >= 8192
#define MEMO_PAGE_ORDER	0	/* 1 PAGE  maximum */
#else
#define MEMO_PAGE_ORDER	1	/* 2 PAGES maximum */
#endif
#define MEMO_FREE_UNUSED	/* Free unused pages immediately */
#define MEMO_WARN	1
#define MEMO_GFP_FLAGS	GFP_ATOMIC
#define MEMO_CLUSTER_SHIFT	(PAGE_SHIFT+MEMO_PAGE_ORDER)
#define MEMO_CLUSTER_SIZE	(1UL << MEMO_CLUSTER_SHIFT)
#define MEMO_CLUSTER_MASK	(MEMO_CLUSTER_SIZE-1)

typedef u_long m_addr_t;	/* Enough bits to bit-hack addresses */
typedef struct device *m_bush_t;	/* Something that addresses DMAable */

typedef struct m_link {		/* Link between free memory chunks */
	struct m_link *next;
} m_link_s;

typedef struct m_vtob {		/* Virtual to Bus address translation */
	struct m_vtob *next;
	m_addr_t vaddr;
	m_addr_t baddr;
} m_vtob_s;
#define VTOB_HASH_SHIFT		5
#define VTOB_HASH_SIZE		(1UL << VTOB_HASH_SHIFT)
#define VTOB_HASH_MASK		(VTOB_HASH_SIZE-1)
#define VTOB_HASH_CODE(m)	\
	((((m_addr_t) (m)) >> MEMO_CLUSTER_SHIFT) & VTOB_HASH_MASK)

typedef struct m_pool {		/* Memory pool of a given kind */
	m_bush_t bush;
	m_addr_t (*getp)(struct m_pool *);
	void (*freep)(struct m_pool *, m_addr_t);
	int nump;
	m_vtob_s *(vtob[VTOB_HASH_SIZE]);
	struct m_pool *next;
	struct m_link h[PAGE_SHIFT-MEMO_SHIFT+MEMO_PAGE_ORDER+1];
} m_pool_s;

static void *___m_alloc(m_pool_s *mp, int size)
{
	int i = 0;
	int s = (1 << MEMO_SHIFT);
	int j;
	m_addr_t a;
	m_link_s *h = mp->h;

	if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
		return NULL;

	while (size > s) {
		s <<= 1;
		++i;
	}

	j = i;
	while (!h[j].next) {
		if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
			h[j].next = (m_link_s *)mp->getp(mp);
			if (h[j].next)
				h[j].next->next = NULL;
			break;
		}
		++j;
		s <<= 1;
	}
	a = (m_addr_t) h[j].next;
	if (a) {
		h[j].next = h[j].next->next;
		while (j > i) {
			j -= 1;
			s >>= 1;
			h[j].next = (m_link_s *) (a+s);
			h[j].next->next = NULL;
		}
	}
#ifdef DEBUG
	printk("___m_alloc(%d) = %p\n", size, (void *) a);
#endif
	return (void *) a;
}

static void ___m_free(m_pool_s *mp, void *ptr, int size)
{
	int i = 0;
	int s = (1 << MEMO_SHIFT);
	m_link_s *q;
	m_addr_t a, b;
	m_link_s *h = mp->h;

#ifdef DEBUG
	printk("___m_free(%p, %d)\n", ptr, size);
#endif

	if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
		return;

	while (size > s) {
		s <<= 1;
		++i;
	}

	a = (m_addr_t) ptr;

	while (1) {
#ifdef MEMO_FREE_UNUSED
		if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
			mp->freep(mp, a);
			break;
		}
#endif
		b = a ^ s;
		q = &h[i];
		while (q->next && q->next != (m_link_s *) b) {
			q = q->next;
		}
		if (!q->next) {
			((m_link_s *) a)->next = h[i].next;
			h[i].next = (m_link_s *) a;
			break;
		}
		q->next = q->next->next;
		a = a & b;
		s <<= 1;
		++i;
	}
}

static DEFINE_SPINLOCK(ncr53c8xx_lock);

static void *__m_calloc2(m_pool_s *mp, int size, char *name, int uflags)
{
	void *p;

	p = ___m_alloc(mp, size);

	if (DEBUG_FLAGS & DEBUG_ALLOC)
		printk ("new %-10s[%4d] @%p.\n", name, size, p);

	if (p)
		memset(p, 0, size);
	else if (uflags & MEMO_WARN)
		printk (NAME53C8XX ": failed to allocate %s[%d]\n", name, size);

	return p;
}

#define __m_calloc(mp, s, n)	__m_calloc2(mp, s, n, MEMO_WARN)

static void __m_free(m_pool_s *mp, void *ptr, int size, char *name)
{
	if (DEBUG_FLAGS & DEBUG_ALLOC)
		printk ("freeing %-10s[%4d] @%p.\n", name, size, ptr);

	___m_free(mp, ptr, size);

}

/*
 * With pci bus iommu support, we use a default pool of unmapped memory 
 * for memory we donnot need to DMA from/to and one pool per pcidev for 
 * memory accessed by the PCI chip. `mp0' is the default not DMAable pool.
 */

static m_addr_t ___mp0_getp(m_pool_s *mp)
{
	m_addr_t m = __get_free_pages(MEMO_GFP_FLAGS, MEMO_PAGE_ORDER);
	if (m)
		++mp->nump;
	return m;
}

static void ___mp0_freep(m_pool_s *mp, m_addr_t m)
{
	free_pages(m, MEMO_PAGE_ORDER);
	--mp->nump;
}

static m_pool_s mp0 = {NULL, ___mp0_getp, ___mp0_freep};

/*
 * DMAable pools.
 */

/*
 * With pci bus iommu support, we maintain one pool per pcidev and a 
 * hashed reverse table for virtual to bus physical address translations.
 */
static m_addr_t ___dma_getp(m_pool_s *mp)
{
	m_addr_t vp;
	m_vtob_s *vbp;

	vbp = __m_calloc(&mp0, sizeof(*vbp), "VTOB");
	if (vbp) {
		dma_addr_t daddr;
		vp = (m_addr_t) dma_alloc_coherent(mp->bush,
						PAGE_SIZE<<MEMO_PAGE_ORDER,
						&daddr, GFP_ATOMIC);
		if (vp) {
			int hc = VTOB_HASH_CODE(vp);
			vbp->vaddr = vp;
			vbp->baddr = daddr;
			vbp->next = mp->vtob[hc];
			mp->vtob[hc] = vbp;
			++mp->nump;
			return vp;
		}
	}
	if (vbp)
		__m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
	return 0;
}

static void ___dma_freep(m_pool_s *mp, m_addr_t m)
{
	m_vtob_s **vbpp, *vbp;
	int hc = VTOB_HASH_CODE(m);

	vbpp = &mp->vtob[hc];
	while (*vbpp && (*vbpp)->vaddr != m)
		vbpp = &(*vbpp)->next;
	if (*vbpp) {
		vbp = *vbpp;
		*vbpp = (*vbpp)->next;
		dma_free_coherent(mp->bush, PAGE_SIZE<<MEMO_PAGE_ORDER,
				  (void *)vbp->vaddr, (dma_addr_t)vbp->baddr);
		__m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
		--mp->nump;
	}
}

static inline m_pool_s *___get_dma_pool(m_bush_t bush)
{
	m_pool_s *mp;
	for (mp = mp0.next; mp && mp->bush != bush; mp = mp->next);
	return mp;
}

static m_pool_s *___cre_dma_pool(m_bush_t bush)
{
	m_pool_s *mp;
	mp = __m_calloc(&mp0, sizeof(*mp), "MPOOL");
	if (mp) {
		memset(mp, 0, sizeof(*mp));
		mp->bush = bush;
		mp->getp = ___dma_getp;
		mp->freep = ___dma_freep;
		mp->next = mp0.next;
		mp0.next = mp;
	}
	return mp;
}

static void ___del_dma_pool(m_pool_s *p)
{
	struct m_pool **pp = &mp0.next;

	while (*pp && *pp != p)
		pp = &(*pp)->next;
	if (*pp) {
		*pp = (*pp)->next;
		__m_free(&mp0, p, sizeof(*p), "MPOOL");
	}
}

static void *__m_calloc_dma(m_bush_t bush, int size, char *name)
{
	u_long flags;
	struct m_pool *mp;
	void *m = NULL;

	spin_lock_irqsave(&ncr53c8xx_lock, flags);
	mp = ___get_dma_pool(bush);
	if (!mp)
		mp = ___cre_dma_pool(bush);
	if (mp)
		m = __m_calloc(mp, size, name);
	if (mp && !mp->nump)
		___del_dma_pool(mp);
	spin_unlock_irqrestore(&ncr53c8xx_lock, flags);

	return m;
}

static void __m_free_dma(m_bush_t bush, void *m, int size, char *name)
{
	u_long flags;
	struct m_pool *mp;

	spin_lock_irqsave(&ncr53c8xx_lock, flags);
	mp = ___get_dma_pool(bush);
	if (mp)
		__m_free(mp, m, size, name);
	if (mp && !mp->nump)
		___del_dma_pool(mp);
	spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
}

static m_addr_t __vtobus(m_bush_t bush, void *m)
{
	u_long flags;
	m_pool_s *mp;
	int hc = VTOB_HASH_CODE(m);
	m_vtob_s *vp = NULL;
	m_addr_t a = ((m_addr_t) m) & ~MEMO_CLUSTER_MASK;

	spin_lock_irqsave(&ncr53c8xx_lock, flags);
	mp = ___get_dma_pool(bush);
	if (mp) {
		vp = mp->vtob[hc];
		while (vp && (m_addr_t) vp->vaddr != a)
			vp = vp->next;
	}
	spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
	return vp ? vp->baddr + (((m_addr_t) m) - a) : 0;
}

#define _m_calloc_dma(np, s, n)		__m_calloc_dma(np->dev, s, n)
#define _m_free_dma(np, p, s, n)	__m_free_dma(np->dev, p, s, n)
#define m_calloc_dma(s, n)		_m_calloc_dma(np, s, n)
#define m_free_dma(p, s, n)		_m_free_dma(np, p, s, n)
#define _vtobus(np, p)			__vtobus(np->dev, p)
#define vtobus(p)			_vtobus(np, p)

/*
 *  Deal with DMA mapping/unmapping.
 */

/* To keep track of the dma mapping (sg/single) that has been set */
#define __data_mapped	SCp.phase
#define __data_mapping	SCp.have_data_in

static void __unmap_scsi_data(struct device *dev, struct scsi_cmnd *cmd)
{
	switch(cmd->__data_mapped) {
	case 2:
		scsi_dma_unmap(cmd);
		break;
	}
	cmd->__data_mapped = 0;
}

static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
{
	int use_sg;

	use_sg = scsi_dma_map(cmd);
	if (!use_sg)
		return 0;

	cmd->__data_mapped = 2;
	cmd->__data_mapping = use_sg;

	return use_sg;
}

#define unmap_scsi_data(np, cmd)	__unmap_scsi_data(np->dev, cmd)
#define map_scsi_sg_data(np, cmd)	__map_scsi_sg_data(np->dev, cmd)

/*==========================================================
**
**	Driver setup.
**
**	This structure is initialized from linux config 
**	options. It can be overridden at boot-up by the boot 
**	command line.
**
**==========================================================
*/
static struct ncr_driver_setup
	driver_setup			= SCSI_NCR_DRIVER_SETUP;

#ifndef MODULE
#ifdef	SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
static struct ncr_driver_setup
	driver_safe_setup __initdata	= SCSI_NCR_DRIVER_SAFE_SETUP;
#endif
#endif /* !MODULE */

#define initverbose (driver_setup.verbose)
#define bootverbose (np->verbose)


/*===================================================================
**
**	Driver setup from the boot command line
**
**===================================================================
*/

#ifdef MODULE
#define	ARG_SEP	' '
#else
#define	ARG_SEP	','
#endif

#define OPT_TAGS		1
#define OPT_MASTER_PARITY	2
#define OPT_SCSI_PARITY		3
#define OPT_DISCONNECTION	4
#define OPT_SPECIAL_FEATURES	5
#define OPT_UNUSED_1		6
#define OPT_FORCE_SYNC_NEGO	7
#define OPT_REVERSE_PROBE	8
#define OPT_DEFAULT_SYNC	9
#define OPT_VERBOSE		10
#define OPT_DEBUG		11
#define OPT_BURST_MAX		12
#define OPT_LED_PIN		13
#define OPT_MAX_WIDE		14
#define OPT_SETTLE_DELAY	15
#define OPT_DIFF_SUPPORT	16
#define OPT_IRQM		17
#define OPT_PCI_FIX_UP		18
#define OPT_BUS_CHECK		19
#define OPT_OPTIMIZE		20
#define OPT_RECOVERY		21
#define OPT_SAFE_SETUP		22
#define OPT_USE_NVRAM		23
#define OPT_EXCLUDE		24
#define OPT_HOST_ID		25

#ifdef SCSI_NCR_IARB_SUPPORT
#define OPT_IARB		26
#endif

#ifdef MODULE
#define	ARG_SEP	' '
#else
#define	ARG_SEP	','
#endif

#ifndef MODULE
static char setup_token[] __initdata = 
	"tags:"   "mpar:"
	"spar:"   "disc:"
	"specf:"  "ultra:"
	"fsn:"    "revprob:"
	"sync:"   "verb:"
	"debug:"  "burst:"
	"led:"    "wide:"
	"settle:" "diff:"
	"irqm:"   "pcifix:"
	"buschk:" "optim:"
	"recovery:"
	"safe:"   "nvram:"
	"excl:"   "hostid:"
#ifdef SCSI_NCR_IARB_SUPPORT
	"iarb:"
#endif
	;	/* DONNOT REMOVE THIS ';' */

static int __init get_setup_token(char *p)
{
	char *cur = setup_token;
	char *pc;
	int i = 0;

	while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
		++pc;
		++i;
		if (!strncmp(p, cur, pc - cur))
			return i;
		cur = pc;
	}
	return 0;
}

static int __init sym53c8xx__setup(char *str)
{
#ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
	char *cur = str;
	char *pc, *pv;
	int i, val, c;
	int xi = 0;

	while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
		char *pe;

		val = 0;
		pv = pc;
		c = *++pv;

		if	(c == 'n')
			val = 0;
		else if	(c == 'y')
			val = 1;
		else
			val = (int) simple_strtoul(pv, &pe, 0);

		switch (get_setup_token(cur)) {
		case OPT_TAGS:
			driver_setup.default_tags = val;
			if (pe && *pe == '/') {
				i = 0;
				while (*pe && *pe != ARG_SEP && 
					i < sizeof(driver_setup.tag_ctrl)-1) {
					driver_setup.tag_ctrl[i++] = *pe++;
				}
				driver_setup.tag_ctrl[i] = '\0';
			}
			break;
		case OPT_MASTER_PARITY:
			driver_setup.master_parity = val;
			break;
		case OPT_SCSI_PARITY:
			driver_setup.scsi_parity = val;
			break;
		case OPT_DISCONNECTION:
			driver_setup.disconnection = val;
			break;
		case OPT_SPECIAL_FEATURES:
			driver_setup.special_features = val;
			break;
		case OPT_FORCE_SYNC_NEGO:
			driver_setup.force_sync_nego = val;
			break;
		case OPT_REVERSE_PROBE:
			driver_setup.reverse_probe = val;
			break;
		case OPT_DEFAULT_SYNC:
			driver_setup.default_sync = val;
			break;
		case OPT_VERBOSE:
			driver_setup.verbose = val;
			break;
		case OPT_DEBUG:
			driver_setup.debug = val;
			break;
		case OPT_BURST_MAX:
			driver_setup.burst_max = val;
			break;
		case OPT_LED_PIN:
			driver_setup.led_pin = val;
			break;
		case OPT_MAX_WIDE:
			driver_setup.max_wide = val? 1:0;
			break;
		case OPT_SETTLE_DELAY:
			driver_setup.settle_delay = val;
			break;
		case OPT_DIFF_SUPPORT:
			driver_setup.diff_support = val;
			break;
		case OPT_IRQM:
			driver_setup.irqm = val;
			break;
		case OPT_PCI_FIX_UP:
			driver_setup.pci_fix_up	= val;
			break;
		case OPT_BUS_CHECK:
			driver_setup.bus_check = val;
			break;
		case OPT_OPTIMIZE:
			driver_setup.optimize = val;
			break;
		case OPT_RECOVERY:
			driver_setup.recovery = val;
			break;
		case OPT_USE_NVRAM:
			driver_setup.use_nvram = val;
			break;
		case OPT_SAFE_SETUP:
			memcpy(&driver_setup, &driver_safe_setup,
				sizeof(driver_setup));
			break;
		case OPT_EXCLUDE:
			if (xi < SCSI_NCR_MAX_EXCLUDES)
				driver_setup.excludes[xi++] = val;
			break;
		case OPT_HOST_ID:
			driver_setup.host_id = val;
			break;
#ifdef SCSI_NCR_IARB_SUPPORT
		case OPT_IARB:
			driver_setup.iarb = val;
			break;
#endif
		default:
			printk("sym53c8xx_setup: unexpected boot option '%.*s' ignored\n", (int)(pc-cur+1), cur);
			break;
		}

		if ((cur = strchr(cur, ARG_SEP)) != NULL)
			++cur;
	}
#endif /* SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT */
	return 1;
}
#endif /* !MODULE */

/*===================================================================
**
**	Get device queue depth from boot command line.
**
**===================================================================
*/
#define DEF_DEPTH	(driver_setup.default_tags)
#define ALL_TARGETS	-2
#define NO_TARGET	-1
#define ALL_LUNS	-2
#define NO_LUN		-1

static int device_queue_depth(int unit, int target, int lun)
{
	int c, h, t, u, v;
	char *p = driver_setup.tag_ctrl;
	char *ep;

	h = -1;
	t = NO_TARGET;
	u = NO_LUN;
	while ((c = *p++) != 0) {
		v = simple_strtoul(p, &ep, 0);
		switch(c) {
		case '/':
			++h;
			t = ALL_TARGETS;
			u = ALL_LUNS;
			break;
		case 't':
			if (t != target)
				t = (target == v) ? v : NO_TARGET;
			u = ALL_LUNS;
			break;
		case 'u':
			if (u != lun)
				u = (lun == v) ? v : NO_LUN;
			break;
		case 'q':
			if (h == unit &&
				(t == ALL_TARGETS || t == target) &&
				(u == ALL_LUNS    || u == lun))
				return v;
			break;
		case '-':
			t = ALL_TARGETS;
			u = ALL_LUNS;
			break;
		default:
			break;
		}
		p = ep;
	}
	return DEF_DEPTH;
}


/*==========================================================
**
**	The CCB done queue uses an array of CCB virtual 
**	addresses. Empty entries are flagged using the bogus 
**	virtual address 0xffffffff.
**
**	Since PCI ensures that only aligned DWORDs are accessed 
**	atomically, 64 bit little-endian architecture requires 
**	to test the high order DWORD of the entry to determine 
**	if it is empty or valid.
**
**	BTW, I will make things differently as soon as I will 
**	have a better idea, but this is simple and should work.
**
**==========================================================
*/
 
#define SCSI_NCR_CCB_DONE_SUPPORT
#ifdef  SCSI_NCR_CCB_DONE_SUPPORT

#define MAX_DONE 24
#define CCB_DONE_EMPTY 0xffffffffUL

/* All 32 bit architectures */
#if BITS_PER_LONG == 32
#define CCB_DONE_VALID(cp)  (((u_long) cp) != CCB_DONE_EMPTY)

/* All > 32 bit (64 bit) architectures regardless endian-ness */
#else
#define CCB_DONE_VALID(cp)  \
	((((u_long) cp) & 0xffffffff00000000ul) && 	\
	 (((u_long) cp) & 0xfffffffful) != CCB_DONE_EMPTY)
#endif

#endif /* SCSI_NCR_CCB_DONE_SUPPORT */

/*==========================================================
**
**	Configuration and Debugging
**
**==========================================================
*/

/*
**    SCSI address of this device.
**    The boot routines should have set it.
**    If not, use this.
*/

#ifndef SCSI_NCR_MYADDR
#define SCSI_NCR_MYADDR      (7)
#endif

/*
**    The maximum number of tags per logic unit.
**    Used only for disk devices that support tags.
*/

#ifndef SCSI_NCR_MAX_TAGS
#define SCSI_NCR_MAX_TAGS    (8)
#endif

/*
**    TAGS are actually limited to 64 tags/lun.
**    We need to deal with power of 2, for alignment constraints.
*/
#if	SCSI_NCR_MAX_TAGS > 64
#define	MAX_TAGS (64)
#else
#define	MAX_TAGS SCSI_NCR_MAX_TAGS
#endif

#define NO_TAG	(255)

/*
**	Choose appropriate type for tag bitmap.
*/
#if	MAX_TAGS > 32
typedef u64 tagmap_t;
#else
typedef u32 tagmap_t;
#endif

/*
**    Number of targets supported by the driver.
**    n permits target numbers 0..n-1.
**    Default is 16, meaning targets #0..#15.
**    #7 .. is myself.
*/

#ifdef SCSI_NCR_MAX_TARGET
#define MAX_TARGET  (SCSI_NCR_MAX_TARGET)
#else
#define MAX_TARGET  (16)
#endif

/*
**    Number of logic units supported by the driver.
**    n enables logic unit numbers 0..n-1.
**    The common SCSI devices require only
**    one lun, so take 1 as the default.
*/

#ifdef SCSI_NCR_MAX_LUN
#define MAX_LUN    SCSI_NCR_MAX_LUN
#else
#define MAX_LUN    (1)
#endif

/*
**    Asynchronous pre-scaler (ns). Shall be 40
*/
 
#ifndef SCSI_NCR_MIN_ASYNC
#define SCSI_NCR_MIN_ASYNC (40)
#endif

/*
**    The maximum number of jobs scheduled for starting.
**    There should be one slot per target, and one slot
**    for each tag of each target in use.
**    The calculation below is actually quite silly ...
*/

#ifdef SCSI_NCR_CAN_QUEUE
#define MAX_START   (SCSI_NCR_CAN_QUEUE + 4)
#else
#define MAX_START   (MAX_TARGET + 7 * MAX_TAGS)
#endif

/*
**   We limit the max number of pending IO to 250.
**   since we donnot want to allocate more than 1 
**   PAGE for 'scripth'.
*/
#if	MAX_START > 250
#undef	MAX_START
#define	MAX_START 250
#endif

/*
**    The maximum number of segments a transfer is split into.
**    We support up to 127 segments for both read and write.
**    The data scripts are broken into 2 sub-scripts.
**    80 (MAX_SCATTERL) segments are moved from a sub-script
**    in on-chip RAM. This makes data transfers shorter than 
**    80k (assuming 1k fs) as fast as possible.
*/

#define MAX_SCATTER (SCSI_NCR_MAX_SCATTER)

#if (MAX_SCATTER > 80)
#define MAX_SCATTERL	80
#define	MAX_SCATTERH	(MAX_SCATTER - MAX_SCATTERL)
#else
#define MAX_SCATTERL	(MAX_SCATTER-1)
#define	MAX_SCATTERH	1
#endif

/*
**	other
*/

#define NCR_SNOOP_TIMEOUT (1000000)

/*
**	Other definitions
*/

#define ScsiResult(host_code, scsi_code) (((host_code) << 16) + ((scsi_code) & 0x7f))

#define initverbose (driver_setup.verbose)
#define bootverbose (np->verbose)

/*==========================================================
**
**	Command control block states.
**
**==========================================================
*/

#define HS_IDLE		(0)
#define HS_BUSY		(1)
#define HS_NEGOTIATE	(2)	/* sync/wide data transfer*/
#define HS_DISCONNECT	(3)	/* Disconnected by target */

#define HS_DONEMASK	(0x80)
#define HS_COMPLETE	(4|HS_DONEMASK)
#define HS_SEL_TIMEOUT	(5|HS_DONEMASK)	/* Selection timeout      */
#define HS_RESET	(6|HS_DONEMASK)	/* SCSI reset	          */
#define HS_ABORTED	(7|HS_DONEMASK)	/* Transfer aborted       */
#define HS_TIMEOUT	(8|HS_DONEMASK)	/* Software timeout       */
#define HS_FAIL		(9|HS_DONEMASK)	/* SCSI or PCI bus errors */
#define HS_UNEXPECTED	(10|HS_DONEMASK)/* Unexpected disconnect  */

/*
**	Invalid host status values used by the SCRIPTS processor 
**	when the nexus is not fully identified.
**	Shall never appear in a CCB.
*/

#define HS_INVALMASK	(0x40)
#define	HS_SELECTING	(0|HS_INVALMASK)
#define	HS_IN_RESELECT	(1|HS_INVALMASK)
#define	HS_STARTING	(2|HS_INVALMASK)

/*
**	Flags set by the SCRIPT processor for commands 
**	that have been skipped.
*/
#define HS_SKIPMASK	(0x20)

/*==========================================================
**
**	Software Interrupt Codes
**
**==========================================================
*/

#define	SIR_BAD_STATUS		(1)
#define	SIR_XXXXXXXXXX		(2)
#define	SIR_NEGO_SYNC		(3)
#define	SIR_NEGO_WIDE		(4)
#define	SIR_NEGO_FAILED		(5)
#define	SIR_NEGO_PROTO		(6)
#define	SIR_REJECT_RECEIVED	(7)
#define	SIR_REJECT_SENT		(8)
#define	SIR_IGN_RESIDUE		(9)
#define	SIR_MISSING_SAVE	(10)
#define	SIR_RESEL_NO_MSG_IN	(11)
#define	SIR_RESEL_NO_IDENTIFY	(12)
#define	SIR_RESEL_BAD_LUN	(13)
#define	SIR_RESEL_BAD_TARGET	(14)
#define	SIR_RESEL_BAD_I_T_L	(15)
#define	SIR_RESEL_BAD_I_T_L_Q	(16)
#define	SIR_DONE_OVERFLOW	(17)
#define	SIR_INTFLY		(18)
#define	SIR_MAX			(18)

/*==========================================================
**
**	Extended error codes.
**	xerr_status field of struct ccb.
**
**==========================================================
*/

#define	XE_OK		(0)
#define	XE_EXTRA_DATA	(1)	/* unexpected data phase */
#define	XE_BAD_PHASE	(2)	/* illegal phase (4/5)   */

/*==========================================================
**
**	Negotiation status.
**	nego_status field	of struct ccb.
**
**==========================================================
*/

#define NS_NOCHANGE	(0)
#define NS_SYNC		(1)
#define NS_WIDE		(2)
#define NS_PPR		(4)

/*==========================================================
**
**	Misc.
**
**==========================================================
*/

#define CCB_MAGIC	(0xf2691ad2)

/*==========================================================
**
**	Declaration of structs.
**
**==========================================================
*/

static struct scsi_transport_template *ncr53c8xx_transport_template = NULL;

struct tcb;
struct lcb;
struct ccb;
struct ncb;
struct script;

struct link {
	ncrcmd	l_cmd;
	ncrcmd	l_paddr;
};

struct	usrcmd {
	u_long	target;
	u_long	lun;
	u_long	data;
	u_long	cmd;
};

#define UC_SETSYNC      10
#define UC_SETTAGS	11
#define UC_SETDEBUG	12
#define UC_SETORDER	13
#define UC_SETWIDE	14
#define UC_SETFLAG	15
#define UC_SETVERBOSE	17

#define	UF_TRACE	(0x01)
#define	UF_NODISC	(0x02)
#define	UF_NOSCAN	(0x04)

/*========================================================================
**
**	Declaration of structs:		target control block
**
**========================================================================
*/
struct tcb {
	/*----------------------------------------------------------------
	**	During reselection the ncr jumps to this point with SFBR 
	**	set to the encoded target number with bit 7 set.
	**	if it's not this target, jump to the next.
	**
	**	JUMP  IF (SFBR != #target#), @(next tcb)
	**----------------------------------------------------------------
	*/
	struct link   jump_tcb;

	/*----------------------------------------------------------------
	**	Load the actual values for the sxfer and the scntl3
	**	register (sync/wide mode).
	**
	**	SCR_COPY (1), @(sval field of this tcb), @(sxfer  register)
	**	SCR_COPY (1), @(wval field of this tcb), @(scntl3 register)
	**----------------------------------------------------------------
	*/
	ncrcmd	getscr[6];

	/*----------------------------------------------------------------
	**	Get the IDENTIFY message and load the LUN to SFBR.
	**
	**	CALL, <RESEL_LUN>
	**----------------------------------------------------------------
	*/
	struct link   call_lun;

	/*----------------------------------------------------------------
	**	Now look for the right lun.
	**
	**	For i = 0 to 3
	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(first lcb mod. i)
	**
	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
	**	It is kind of hashcoding.
	**----------------------------------------------------------------
	*/
	struct link     jump_lcb[4];	/* JUMPs for reselection	*/
	struct lcb *	lp[MAX_LUN];	/* The lcb's of this tcb	*/

	/*----------------------------------------------------------------
	**	Pointer to the ccb used for negotiation.
	**	Prevent from starting a negotiation for all queued commands 
	**	when tagged command queuing is enabled.
	**----------------------------------------------------------------
	*/
	struct ccb *   nego_cp;

	/*----------------------------------------------------------------
	**	statistical data
	**----------------------------------------------------------------
	*/
	u_long	transfers;
	u_long	bytes;

	/*----------------------------------------------------------------
	**	negotiation of wide and synch transfer and device quirks.
	**----------------------------------------------------------------
	*/
#ifdef SCSI_NCR_BIG_ENDIAN
/*0*/	u16	period;
/*2*/	u_char	sval;
/*3*/	u_char	minsync;
/*0*/	u_char	wval;
/*1*/	u_char	widedone;
/*2*/	u_char	quirks;
/*3*/	u_char	maxoffs;
#else
/*0*/	u_char	minsync;
/*1*/	u_char	sval;
/*2*/	u16	period;
/*0*/	u_char	maxoffs;
/*1*/	u_char	quirks;
/*2*/	u_char	widedone;
/*3*/	u_char	wval;
#endif

	/* User settable limits and options.  */
	u_char	usrsync;
	u_char	usrwide;
	u_char	usrtags;
	u_char	usrflag;
	struct scsi_target *starget;
};

/*========================================================================
**
**	Declaration of structs:		lun control block
**
**========================================================================
*/
struct lcb {
	/*----------------------------------------------------------------
	**	During reselection the ncr jumps to this point
	**	with SFBR set to the "Identify" message.
	**	if it's not this lun, jump to the next.
	**
	**	JUMP  IF (SFBR != #lun#), @(next lcb of this target)
	**
	**	It is this lun. Load TEMP with the nexus jumps table 
	**	address and jump to RESEL_TAG (or RESEL_NOTAG).
	**
	**		SCR_COPY (4), p_jump_ccb, TEMP,
	**		SCR_JUMP, <RESEL_TAG>
	**----------------------------------------------------------------
	*/
	struct link	jump_lcb;
	ncrcmd		load_jump_ccb[3];
	struct link	jump_tag;
	ncrcmd		p_jump_ccb;	/* Jump table bus address	*/

	/*----------------------------------------------------------------
	**	Jump table used by the script processor to directly jump 
	**	to the CCB corresponding to the reselected nexus.
	**	Address is allocated on 256 bytes boundary in order to 
	**	allow 8 bit calculation of the tag jump entry for up to 
	**	64 possible tags.
	**----------------------------------------------------------------
	*/
	u32		jump_ccb_0;	/* Default table if no tags	*/
	u32		*jump_ccb;	/* Virtual address		*/

	/*----------------------------------------------------------------
	**	CCB queue management.
	**----------------------------------------------------------------
	*/
	struct list_head free_ccbq;	/* Queue of available CCBs	*/
	struct list_head busy_ccbq;	/* Queue of busy CCBs		*/
	struct list_head wait_ccbq;	/* Queue of waiting for IO CCBs	*/
	struct list_head skip_ccbq;	/* Queue of skipped CCBs	*/
	u_char		actccbs;	/* Number of allocated CCBs	*/
	u_char		busyccbs;	/* CCBs busy for this lun	*/
	u_char		queuedccbs;	/* CCBs queued to the controller*/
	u_char		queuedepth;	/* Queue depth for this lun	*/
	u_char		scdev_depth;	/* SCSI device queue depth	*/
	u_char		maxnxs;		/* Max possible nexuses		*/

	/*----------------------------------------------------------------
	**	Control of tagged command queuing.
	**	Tags allocation is performed using a circular buffer.
	**	This avoids using a loop for tag allocation.
	**----------------------------------------------------------------
	*/
	u_char		ia_tag;		/* Allocation index		*/
	u_char		if_tag;		/* Freeing index		*/
	u_char cb_tags[MAX_TAGS];	/* Circular tags buffer	*/
	u_char		usetags;	/* Command queuing is active	*/
	u_char		maxtags;	/* Max nr of tags asked by user	*/
	u_char		numtags;	/* Current number of tags	*/

	/*----------------------------------------------------------------
	**	QUEUE FULL control and ORDERED tag control.
	**----------------------------------------------------------------
	*/
	/*----------------------------------------------------------------
	**	QUEUE FULL and ORDERED tag control.
	**----------------------------------------------------------------
	*/
	u16		num_good;	/* Nr of GOOD since QUEUE FULL	*/
	tagmap_t	tags_umap;	/* Used tags bitmap		*/
	tagmap_t	tags_smap;	/* Tags in use at 'tag_stime'	*/
	u_long		tags_stime;	/* Last time we set smap=umap	*/
	struct ccb *	held_ccb;	/* CCB held for QUEUE FULL	*/
};

/*========================================================================
**
**      Declaration of structs:     the launch script.
**
**========================================================================
**
**	It is part of the CCB and is called by the scripts processor to 
**	start or restart the data structure (nexus).
**	This 6 DWORDs mini script makes use of prefetching.
**
**------------------------------------------------------------------------
*/
struct launch {
	/*----------------------------------------------------------------
	**	SCR_COPY(4),	@(p_phys), @(dsa register)
	**	SCR_JUMP,	@(scheduler_point)
	**----------------------------------------------------------------
	*/
	ncrcmd		setup_dsa[3];	/* Copy 'phys' address to dsa	*/
	struct link	schedule;	/* Jump to scheduler point	*/
	ncrcmd		p_phys;		/* 'phys' header bus address	*/
};

/*========================================================================
**
**      Declaration of structs:     global HEADER.
**
**========================================================================
**
**	This substructure is copied from the ccb to a global address after 
**	selection (or reselection) and copied back before disconnect.
**
**	These fields are accessible to the script processor.
**
**------------------------------------------------------------------------
*/

struct head {
	/*----------------------------------------------------------------
	**	Saved data pointer.
	**	Points to the position in the script responsible for the
	**	actual transfer transfer of data.
	**	It's written after reception of a SAVE_DATA_POINTER message.
	**	The goalpointer points after the last transfer command.
	**----------------------------------------------------------------
	*/
	u32		savep;
	u32		lastp;
	u32		goalp;

	/*----------------------------------------------------------------
	**	Alternate data pointer.
	**	They are copied back to savep/lastp/goalp by the SCRIPTS 
	**	when the direction is unknown and the device claims data out.
	**----------------------------------------------------------------
	*/
	u32		wlastp;
	u32		wgoalp;

	/*----------------------------------------------------------------
	**	The virtual address of the ccb containing this header.
	**----------------------------------------------------------------
	*/
	struct ccb *	cp;

	/*----------------------------------------------------------------
	**	Status fields.
	**----------------------------------------------------------------
	*/
	u_char		scr_st[4];	/* script status		*/
	u_char		status[4];	/* host status. must be the 	*/
					/*  last DWORD of the header.	*/
};

/*
**	The status bytes are used by the host and the script processor.
**
**	The byte corresponding to the host_status must be stored in the 
**	last DWORD of the CCB header since it is used for command 
**	completion (ncr_wakeup()). Doing so, we are sure that the header 
**	has been entirely copied back to the CCB when the host_status is 
**	seen complete by the CPU.
**
**	The last four bytes (status[4]) are copied to the scratchb register
**	(declared as scr0..scr3 in ncr_reg.h) just after the select/reselect,
**	and copied back just after disconnecting.
**	Inside the script the XX_REG are used.
**
**	The first four bytes (scr_st[4]) are used inside the script by 
**	"COPY" commands.
**	Because source and destination must have the same alignment
**	in a DWORD, the fields HAVE to be at the chosen offsets.
**		xerr_st		0	(0x34)	scratcha
**		sync_st		1	(0x05)	sxfer
**		wide_st		3	(0x03)	scntl3
*/

/*
**	Last four bytes (script)
*/
#define  QU_REG	scr0
#define  HS_REG	scr1
#define  HS_PRT	nc_scr1
#define  SS_REG	scr2
#define  SS_PRT	nc_scr2
#define  PS_REG	scr3

/*
**	Last four bytes (host)
*/
#ifdef SCSI_NCR_BIG_ENDIAN
#define  actualquirks  phys.header.status[3]
#define  host_status   phys.header.status[2]
#define  scsi_status   phys.header.status[1]
#define  parity_status phys.header.status[0]
#else
#define  actualquirks  phys.header.status[0]
#define  host_status   phys.header.status[1]
#define  scsi_status   phys.header.status[2]
#define  parity_status phys.header.status[3]
#endif

/*
**	First four bytes (script)
*/
#define  xerr_st       header.scr_st[0]
#define  sync_st       header.scr_st[1]
#define  nego_st       header.scr_st[2]
#define  wide_st       header.scr_st[3]

/*
**	First four bytes (host)
*/
#define  xerr_status   phys.xerr_st
#define  nego_status   phys.nego_st

#if 0
#define  sync_status   phys.sync_st
#define  wide_status   phys.wide_st
#endif

/*==========================================================
**
**      Declaration of structs:     Data structure block
**
**==========================================================
**
**	During execution of a ccb by the script processor,
**	the DSA (data structure address) register points
**	to this substructure of the ccb.
**	This substructure contains the header with
**	the script-processor-changeable data and
**	data blocks for the indirect move commands.
**
**----------------------------------------------------------
*/

struct dsb {

	/*
	**	Header.
	*/

	struct head	header;

	/*
	**	Table data for Script
	*/

	struct scr_tblsel  select;
	struct scr_tblmove smsg  ;
	struct scr_tblmove cmd   ;
	struct scr_tblmove sense ;
	struct scr_tblmove data[MAX_SCATTER];
};


/*========================================================================
**
**      Declaration of structs:     Command control block.
**
**========================================================================
*/
struct ccb {
	/*----------------------------------------------------------------
	**	This is the data structure which is pointed by the DSA 
	**	register when it is executed by the script processor.
	**	It must be the first entry because it contains the header 
	**	as first entry that must be cache line aligned.
	**----------------------------------------------------------------
	*/
	struct dsb	phys;

	/*----------------------------------------------------------------
	**	Mini-script used at CCB execution start-up.
	**	Load the DSA with the data structure address (phys) and 
	**	jump to SELECT. Jump to CANCEL if CCB is to be canceled.
	**----------------------------------------------------------------
	*/
	struct launch	start;

	/*----------------------------------------------------------------
	**	Mini-script used at CCB relection to restart the nexus.
	**	Load the DSA with the data structure address (phys) and 
	**	jump to RESEL_DSA. Jump to ABORT if CCB is to be aborted.
	**----------------------------------------------------------------
	*/
	struct launch	restart;

	/*----------------------------------------------------------------
	**	If a data transfer phase is terminated too early
	**	(after reception of a message (i.e. DISCONNECT)),
	**	we have to prepare a mini script to transfer
	**	the rest of the data.
	**----------------------------------------------------------------
	*/
	ncrcmd		patch[8];

	/*----------------------------------------------------------------
	**	The general SCSI driver provides a
	**	pointer to a control block.
	**----------------------------------------------------------------
	*/
	struct scsi_cmnd	*cmd;		/* SCSI command 		*/
	u_char		cdb_buf[16];	/* Copy of CDB			*/
	u_char		sense_buf[64];
	int		data_len;	/* Total data length		*/

	/*----------------------------------------------------------------
	**	Message areas.
	**	We prepare a message to be sent after selection.
	**	We may use a second one if the command is rescheduled 
	**	due to GETCC or QFULL.
	**      Contents are IDENTIFY and SIMPLE_TAG.
	**	While negotiating sync or wide transfer,
	**	a SDTR or WDTR message is appended.
	**----------------------------------------------------------------
	*/
	u_char		scsi_smsg [8];
	u_char		scsi_smsg2[8];

	/*----------------------------------------------------------------
	**	Other fields.
	**----------------------------------------------------------------
	*/
	u_long		p_ccb;		/* BUS address of this CCB	*/
	u_char		sensecmd[6];	/* Sense command		*/
	u_char		tag;		/* Tag for this transfer	*/
					/*  255 means no tag		*/
	u_char		target;
	u_char		lun;
	u_char		queued;
	u_char		auto_sense;
	struct ccb *	link_ccb;	/* Host adapter CCB chain	*/
	struct list_head link_ccbq;	/* Link to unit CCB queue	*/
	u32		startp;		/* Initial data pointer		*/
	u_long		magic;		/* Free / busy  CCB flag	*/
};

#define CCB_PHYS(cp,lbl)	(cp->p_ccb + offsetof(struct ccb, lbl))


/*========================================================================
**
**      Declaration of structs:     NCR device descriptor
**
**========================================================================
*/
struct ncb {
	/*----------------------------------------------------------------
	**	The global header.
	**	It is accessible to both the host and the script processor.
	**	Must be cache line size aligned (32 for x86) in order to 
	**	allow cache line bursting when it is copied to/from CCB.
	**----------------------------------------------------------------
	*/
	struct head     header;

	/*----------------------------------------------------------------
	**	CCBs management queues.
	**----------------------------------------------------------------
	*/
	struct scsi_cmnd	*waiting_list;	/* Commands waiting for a CCB	*/
					/*  when lcb is not allocated.	*/
	struct scsi_cmnd	*done_list;	/* Commands waiting for done()  */
					/* callback to be invoked.      */ 
	spinlock_t	smp_lock;	/* Lock for SMP threading       */

	/*----------------------------------------------------------------
	**	Chip and controller indentification.
	**----------------------------------------------------------------
	*/
	int		unit;		/* Unit number			*/
	char		inst_name[16];	/* ncb instance name		*/

	/*----------------------------------------------------------------
	**	Initial value of some IO register bits.
	**	These values are assumed to have been set by BIOS, and may 
	**	be used for probing adapter implementation differences.
	**----------------------------------------------------------------
	*/
	u_char	sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest0, sv_ctest3,
		sv_ctest4, sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4;

	/*----------------------------------------------------------------
	**	Actual initial value of IO register bits used by the 
	**	driver. They are loaded at initialisation according to  
	**	features that are to be enabled.
	**----------------------------------------------------------------
	*/
	u_char	rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest0, rv_ctest3,
		rv_ctest4, rv_ctest5, rv_stest2;

	/*----------------------------------------------------------------
	**	Targets management.
	**	During reselection the ncr jumps to jump_tcb.
	**	The SFBR register is loaded with the encoded target id.
	**	For i = 0 to 3
	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(next tcb mod. i)
	**
	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
	**	It is kind of hashcoding.
	**----------------------------------------------------------------
	*/
	struct link     jump_tcb[4];	/* JUMPs for reselection	*/
	struct tcb  target[MAX_TARGET];	/* Target data			*/

	/*----------------------------------------------------------------
	**	Virtual and physical bus addresses of the chip.
	**----------------------------------------------------------------
	*/
	void __iomem *vaddr;		/* Virtual and bus address of	*/
	unsigned long	paddr;		/*  chip's IO registers.	*/
	unsigned long	paddr2;		/* On-chip RAM bus address.	*/
	volatile			/* Pointer to volatile for 	*/
	struct ncr_reg	__iomem *reg;	/*  memory mapped IO.		*/

	/*----------------------------------------------------------------
	**	SCRIPTS virtual and physical bus addresses.
	**	'script'  is loaded in the on-chip RAM if present.
	**	'scripth' stays in main memory.
	**----------------------------------------------------------------
	*/
	struct script	*script0;	/* Copies of script and scripth	*/
	struct scripth	*scripth0;	/*  relocated for this ncb.	*/
	struct scripth	*scripth;	/* Actual scripth virt. address	*/
	u_long		p_script;	/* Actual script and scripth	*/
	u_long		p_scripth;	/*  bus addresses.		*/

	/*----------------------------------------------------------------
	**	General controller parameters and configuration.
	**----------------------------------------------------------------
	*/
	struct device	*dev;
	u_char		revision_id;	/* PCI device revision id	*/
	u32		irq;		/* IRQ level			*/
	u32		features;	/* Chip features map		*/
	u_char		myaddr;		/* SCSI id of the adapter	*/
	u_char		maxburst;	/* log base 2 of dwords burst	*/
	u_char		maxwide;	/* Maximum transfer width	*/
	u_char		minsync;	/* Minimum sync period factor	*/
	u_char		maxsync;	/* Maximum sync period factor	*/
	u_char		maxoffs;	/* Max scsi offset		*/
	u_char		multiplier;	/* Clock multiplier (1,2,4)	*/
	u_char		clock_divn;	/* Number of clock divisors	*/
	u_long		clock_khz;	/* SCSI clock frequency in KHz	*/

	/*----------------------------------------------------------------
	**	Start queue management.
	**	It is filled up by the host processor and accessed by the 
	**	SCRIPTS processor in order to start SCSI commands.
	**----------------------------------------------------------------
	*/
	u16		squeueput;	/* Next free slot of the queue	*/
	u16		actccbs;	/* Number of allocated CCBs	*/
	u16		queuedccbs;	/* Number of CCBs in start queue*/
	u16		queuedepth;	/* Start queue depth		*/

	/*----------------------------------------------------------------
	**	Timeout handler.
	**----------------------------------------------------------------
	*/
	struct timer_list timer;	/* Timer handler link header	*/
	u_long		lasttime;
	u_long		settle_time;	/* Resetting the SCSI BUS	*/

	/*----------------------------------------------------------------
	**	Debugging and profiling.
	**----------------------------------------------------------------
	*/
	struct ncr_reg	regdump;	/* Register dump		*/
	u_long		regtime;	/* Time it has been done	*/

	/*----------------------------------------------------------------
	**	Miscellaneous buffers accessed by the scripts-processor.
	**	They shall be DWORD aligned, because they may be read or 
	**	written with a SCR_COPY script command.
	**----------------------------------------------------------------
	*/
	u_char		msgout[8];	/* Buffer for MESSAGE OUT 	*/
	u_char		msgin [8];	/* Buffer for MESSAGE IN	*/
	u32		lastmsg;	/* Last SCSI message sent	*/
	u_char		scratch;	/* Scratch for SCSI receive	*/

	/*----------------------------------------------------------------
	**	Miscellaneous configuration and status parameters.
	**----------------------------------------------------------------
	*/
	u_char		disc;		/* Diconnection allowed		*/
	u_char		scsi_mode;	/* Current SCSI BUS mode	*/
	u_char		order;		/* Tag order to use		*/
	u_char		verbose;	/* Verbosity for this controller*/
	int		ncr_cache;	/* Used for cache test at init.	*/
	u_long		p_ncb;		/* BUS address of this NCB	*/

	/*----------------------------------------------------------------
	**	Command completion handling.
	**----------------------------------------------------------------
	*/
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
	struct ccb	*(ccb_done[MAX_DONE]);
	int		ccb_done_ic;
#endif
	/*----------------------------------------------------------------
	**	Fields that should be removed or changed.
	**----------------------------------------------------------------
	*/
	struct ccb	*ccb;		/* Global CCB			*/
	struct usrcmd	user;		/* Command from user		*/
	volatile u_char	release_stage;	/* Synchronisation stage on release  */
};

#define NCB_SCRIPT_PHYS(np,lbl)	 (np->p_script  + offsetof (struct script, lbl))
#define NCB_SCRIPTH_PHYS(np,lbl) (np->p_scripth + offsetof (struct scripth,lbl))

/*==========================================================
**
**
**      Script for NCR-Processor.
**
**	Use ncr_script_fill() to create the variable parts.
**	Use ncr_script_copy_and_bind() to make a copy and
**	bind to physical addresses.
**
**
**==========================================================
**
**	We have to know the offsets of all labels before
**	we reach them (for forward jumps).
**	Therefore we declare a struct here.
**	If you make changes inside the script,
**	DONT FORGET TO CHANGE THE LENGTHS HERE!
**
**----------------------------------------------------------
*/

/*
**	For HP Zalon/53c720 systems, the Zalon interface
**	between CPU and 53c720 does prefetches, which causes
**	problems with self modifying scripts.  The problem
**	is overcome by calling a dummy subroutine after each
**	modification, to force a refetch of the script on
**	return from the subroutine.
*/

#ifdef CONFIG_NCR53C8XX_PREFETCH
#define PREFETCH_FLUSH_CNT	2
#define PREFETCH_FLUSH		SCR_CALL, PADDRH (wait_dma),
#else
#define PREFETCH_FLUSH_CNT	0
#define PREFETCH_FLUSH
#endif

/*
**	Script fragments which are loaded into the on-chip RAM 
**	of 825A, 875 and 895 chips.
*/
struct script {
	ncrcmd	start		[  5];
	ncrcmd  startpos	[  1];
	ncrcmd	select		[  6];
	ncrcmd	select2		[  9 + PREFETCH_FLUSH_CNT];
	ncrcmd	loadpos		[  4];
	ncrcmd	send_ident	[  9];
	ncrcmd	prepare		[  6];
	ncrcmd	prepare2	[  7];
	ncrcmd  command		[  6];
	ncrcmd  dispatch	[ 32];
	ncrcmd  clrack		[  4];
	ncrcmd	no_data		[ 17];
	ncrcmd  status		[  8];
	ncrcmd  msg_in		[  2];
	ncrcmd  msg_in2		[ 16];
	ncrcmd  msg_bad		[  4];
	ncrcmd	setmsg		[  7];
	ncrcmd	cleanup		[  6];
	ncrcmd  complete	[  9];
	ncrcmd	cleanup_ok	[  8 + PREFETCH_FLUSH_CNT];
	ncrcmd	cleanup0	[  1];
#ifndef SCSI_NCR_CCB_DONE_SUPPORT
	ncrcmd	signal		[ 12];
#else
	ncrcmd	signal		[  9];
	ncrcmd	done_pos	[  1];
	ncrcmd	done_plug	[  2];
	ncrcmd	done_end	[  7];
#endif
	ncrcmd  save_dp		[  7];
	ncrcmd  restore_dp	[  5];
	ncrcmd  disconnect	[ 10];
	ncrcmd	msg_out		[  9];
	ncrcmd	msg_out_done	[  7];
	ncrcmd  idle		[  2];
	ncrcmd	reselect	[  8];
	ncrcmd	reselected	[  8];
	ncrcmd	resel_dsa	[  6 + PREFETCH_FLUSH_CNT];
	ncrcmd	loadpos1	[  4];
	ncrcmd  resel_lun	[  6];
	ncrcmd	resel_tag	[  6];
	ncrcmd	jump_to_nexus	[  4 + PREFETCH_FLUSH_CNT];
	ncrcmd	nexus_indirect	[  4];
	ncrcmd	resel_notag	[  4];
	ncrcmd  data_in		[MAX_SCATTERL * 4];
	ncrcmd  data_in2	[  4];
	ncrcmd  data_out	[MAX_SCATTERL * 4];
	ncrcmd  data_out2	[  4];
};

/*
**	Script fragments which stay in main memory for all chips.
*/
struct scripth {
	ncrcmd  tryloop		[MAX_START*2];
	ncrcmd  tryloop2	[  2];
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
	ncrcmd  done_queue	[MAX_DONE*5];
	ncrcmd  done_queue2	[  2];
#endif
	ncrcmd	select_no_atn	[  8];
	ncrcmd	cancel		[  4];
	ncrcmd	skip		[  9 + PREFETCH_FLUSH_CNT];
	ncrcmd	skip2		[ 19];
	ncrcmd	par_err_data_in	[  6];
	ncrcmd	par_err_other	[  4];
	ncrcmd	msg_reject	[  8];
	ncrcmd	msg_ign_residue	[ 24];
	ncrcmd  msg_extended	[ 10];
	ncrcmd  msg_ext_2	[ 10];
	ncrcmd	msg_wdtr	[ 14];
	ncrcmd	send_wdtr	[  7];
	ncrcmd  msg_ext_3	[ 10];
	ncrcmd	msg_sdtr	[ 14];
	ncrcmd	send_sdtr	[  7];
	ncrcmd	nego_bad_phase	[  4];
	ncrcmd	msg_out_abort	[ 10];
	ncrcmd  hdata_in	[MAX_SCATTERH * 4];
	ncrcmd  hdata_in2	[  2];
	ncrcmd  hdata_out	[MAX_SCATTERH * 4];
	ncrcmd  hdata_out2	[  2];
	ncrcmd	reset		[  4];
	ncrcmd	aborttag	[  4];
	ncrcmd	abort		[  2];
	ncrcmd	abort_resel	[ 20];
	ncrcmd	resend_ident	[  4];
	ncrcmd	clratn_go_on	[  3];
	ncrcmd	nxtdsp_go_on	[  1];
	ncrcmd	sdata_in	[  8];
	ncrcmd  data_io		[ 18];
	ncrcmd	bad_identify	[ 12];
	ncrcmd	bad_i_t_l	[  4];
	ncrcmd	bad_i_t_l_q	[  4];
	ncrcmd	bad_target	[  8];
	ncrcmd	bad_status	[  8];
	ncrcmd	start_ram	[  4 + PREFETCH_FLUSH_CNT];
	ncrcmd	start_ram0	[  4];
	ncrcmd	sto_restart	[  5];
	ncrcmd	wait_dma	[  2];
	ncrcmd	snooptest	[  9];
	ncrcmd	snoopend	[  2];
};

/*==========================================================
**
**
**      Function headers.
**
**
**==========================================================
*/

static	void	ncr_alloc_ccb	(struct ncb *np, u_char tn, u_char ln);
static	void	ncr_complete	(struct ncb *np, struct ccb *cp);
static	void	ncr_exception	(struct ncb *np);
static	void	ncr_free_ccb	(struct ncb *np, struct ccb *cp);
static	void	ncr_init_ccb	(struct ncb *np, struct ccb *cp);
static	void	ncr_init_tcb	(struct ncb *np, u_char tn);
static	struct lcb *	ncr_alloc_lcb	(struct ncb *np, u_char tn, u_char ln);
static	struct lcb *	ncr_setup_lcb	(struct ncb *np, struct scsi_device *sdev);
static	void	ncr_getclock	(struct ncb *np, int mult);
static	void	ncr_selectclock	(struct ncb *np, u_char scntl3);
static	struct ccb *ncr_get_ccb	(struct ncb *np, struct scsi_cmnd *cmd);
static	void	ncr_chip_reset	(struct ncb *np, int delay);
static	void	ncr_init	(struct ncb *np, int reset, char * msg, u_long code);
static	int	ncr_int_sbmc	(struct ncb *np);
static	int	ncr_int_par	(struct ncb *np);
static	void	ncr_int_ma	(struct ncb *np);
static	void	ncr_int_sir	(struct ncb *np);
static  void    ncr_int_sto     (struct ncb *np);
static	void	ncr_negotiate	(struct ncb* np, struct tcb* tp);
static	int	ncr_prepare_nego(struct ncb *np, struct ccb *cp, u_char *msgptr);

static	void	ncr_script_copy_and_bind
				(struct ncb *np, ncrcmd *src, ncrcmd *dst, int len);
static  void    ncr_script_fill (struct script * scr, struct scripth * scripth);
static	int	ncr_scatter	(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd);
static	void	ncr_getsync	(struct ncb *np, u_char sfac, u_char *fakp, u_char *scntl3p);
static	void	ncr_setsync	(struct ncb *np, struct ccb *cp, u_char scntl3, u_char sxfer);
static	void	ncr_setup_tags	(struct ncb *np, struct scsi_device *sdev);
static	void	ncr_setwide	(struct ncb *np, struct ccb *cp, u_char wide, u_char ack);
static	int	ncr_snooptest	(struct ncb *np);
static	void	ncr_timeout	(struct ncb *np);
static  void    ncr_wakeup      (struct ncb *np, u_long code);
static  void    ncr_wakeup_done (struct ncb *np);
static	void	ncr_start_next_ccb (struct ncb *np, struct lcb * lp, int maxn);
static	void	ncr_put_start_queue(struct ncb *np, struct ccb *cp);

static void insert_into_waiting_list(struct ncb *np, struct scsi_cmnd *cmd);
static struct scsi_cmnd *retrieve_from_waiting_list(int to_remove, struct ncb *np, struct scsi_cmnd *cmd);
static void process_waiting_list(struct ncb *np, int sts);

#define remove_from_waiting_list(np, cmd) \
		retrieve_from_waiting_list(1, (np), (cmd))
#define requeue_waiting_list(np) process_waiting_list((np), DID_OK)
#define reset_waiting_list(np) process_waiting_list((np), DID_RESET)

static inline char *ncr_name (struct ncb *np)
{
	return np->inst_name;
}


/*==========================================================
**
**
**      Scripts for NCR-Processor.
**
**      Use ncr_script_bind for binding to physical addresses.
**
**
**==========================================================
**
**	NADDR generates a reference to a field of the controller data.
**	PADDR generates a reference to another part of the script.
**	RADDR generates a reference to a script processor register.
**	FADDR generates a reference to a script processor register
**		with offset.
**
**----------------------------------------------------------
*/

#define	RELOC_SOFTC	0x40000000
#define	RELOC_LABEL	0x50000000
#define	RELOC_REGISTER	0x60000000
#if 0
#define	RELOC_KVAR	0x70000000
#endif
#define	RELOC_LABELH	0x80000000
#define	RELOC_MASK	0xf0000000

#define	NADDR(label)	(RELOC_SOFTC | offsetof(struct ncb, label))
#define PADDR(label)    (RELOC_LABEL | offsetof(struct script, label))
#define PADDRH(label)   (RELOC_LABELH | offsetof(struct scripth, label))
#define	RADDR(label)	(RELOC_REGISTER | REG(label))
#define	FADDR(label,ofs)(RELOC_REGISTER | ((REG(label))+(ofs)))
#if 0
#define	KVAR(which)	(RELOC_KVAR | (which))
#endif

#if 0
#define	SCRIPT_KVAR_JIFFIES	(0)
#define	SCRIPT_KVAR_FIRST		SCRIPT_KVAR_JIFFIES
#define	SCRIPT_KVAR_LAST		SCRIPT_KVAR_JIFFIES
/*
 * Kernel variables referenced in the scripts.
 * THESE MUST ALL BE ALIGNED TO A 4-BYTE BOUNDARY.
 */
static void *script_kvars[] __initdata =
	{ (void *)&jiffies };
#endif

static	struct script script0 __initdata = {
/*--------------------------< START >-----------------------*/ {
	/*
	**	This NOP will be patched with LED ON
	**	SCR_REG_REG (gpreg, SCR_AND, 0xfe)
	*/
	SCR_NO_OP,
		0,
	/*
	**      Clear SIGP.
	*/
	SCR_FROM_REG (ctest2),
		0,
	/*
	**	Then jump to a certain point in tryloop.
	**	Due to the lack of indirect addressing the code
	**	is self modifying here.
	*/
	SCR_JUMP,
}/*-------------------------< STARTPOS >--------------------*/,{
		PADDRH(tryloop),

}/*-------------------------< SELECT >----------------------*/,{
	/*
	**	DSA	contains the address of a scheduled
	**		data structure.
	**
	**	SCRATCHA contains the address of the script,
	**		which starts the next entry.
	**
	**	Set Initiator mode.
	**
	**	(Target mode is left as an exercise for the reader)
	*/

	SCR_CLR (SCR_TRG),
		0,
	SCR_LOAD_REG (HS_REG, HS_SELECTING),
		0,

	/*
	**      And try to select this target.
	*/
	SCR_SEL_TBL_ATN ^ offsetof (struct dsb, select),
		PADDR (reselect),

}/*-------------------------< SELECT2 >----------------------*/,{
	/*
	**	Now there are 4 possibilities:
	**
	**	(1) The ncr loses arbitration.
	**	This is ok, because it will try again,
	**	when the bus becomes idle.
	**	(But beware of the timeout function!)
	**
	**	(2) The ncr is reselected.
	**	Then the script processor takes the jump
	**	to the RESELECT label.
	**
	**	(3) The ncr wins arbitration.
	**	Then it will execute SCRIPTS instruction until 
	**	the next instruction that checks SCSI phase.
	**	Then will stop and wait for selection to be 
	**	complete or selection time-out to occur.
	**	As a result the SCRIPTS instructions until 
	**	LOADPOS + 2 should be executed in parallel with 
	**	the SCSI core performing selection.
	*/

	/*
	**	The MESSAGE_REJECT problem seems to be due to a selection 
	**	timing problem.
	**	Wait immediately for the selection to complete. 
	**	(2.5x behaves so)
	*/
	SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_OUT)),
		0,

	/*
	**	Next time use the next slot.
	*/
	SCR_COPY (4),
		RADDR (temp),
		PADDR (startpos),
	/*
	**      The ncr doesn't have an indirect load
	**	or store command. So we have to
	**	copy part of the control block to a
	**	fixed place, where we can access it.
	**
	**	We patch the address part of a
	**	COPY command with the DSA-register.
	*/
	SCR_COPY_F (4),
		RADDR (dsa),
		PADDR (loadpos),
	/*
	**	Flush script prefetch if required
	*/
	PREFETCH_FLUSH
	/*
	**	then we do the actual copy.
	*/
	SCR_COPY (sizeof (struct head)),
	/*
	**	continued after the next label ...
	*/
}/*-------------------------< LOADPOS >---------------------*/,{
		0,
		NADDR (header),
	/*
	**	Wait for the next phase or the selection
	**	to complete or time-out.
	*/
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
		PADDR (prepare),

}/*-------------------------< SEND_IDENT >----------------------*/,{
	/*
	**	Selection complete.
	**	Send the IDENTIFY and SIMPLE_TAG messages
	**	(and the EXTENDED_SDTR message)
	*/
	SCR_MOVE_TBL ^ SCR_MSG_OUT,
		offsetof (struct dsb, smsg),
	SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
		PADDRH (resend_ident),
	SCR_LOAD_REG (scratcha, 0x80),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (lastmsg),
}/*-------------------------< PREPARE >----------------------*/,{
	/*
	**      load the savep (saved pointer) into
	**      the TEMP register (actual pointer)
	*/
	SCR_COPY (4),
		NADDR (header.savep),
		RADDR (temp),
	/*
	**      Initialize the status registers
	*/
	SCR_COPY (4),
		NADDR (header.status),
		RADDR (scr0),
}/*-------------------------< PREPARE2 >---------------------*/,{
	/*
	**	Initialize the msgout buffer with a NOOP message.
	*/
	SCR_LOAD_REG (scratcha, NOP),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (msgout),
#if 0
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (msgin),
#endif
	/*
	**	Anticipate the COMMAND phase.
	**	This is the normal case for initial selection.
	*/
	SCR_JUMP ^ IFFALSE (WHEN (SCR_COMMAND)),
		PADDR (dispatch),

}/*-------------------------< COMMAND >--------------------*/,{
	/*
	**	... and send the command
	*/
	SCR_MOVE_TBL ^ SCR_COMMAND,
		offsetof (struct dsb, cmd),
	/*
	**	If status is still HS_NEGOTIATE, negotiation failed.
	**	We check this here, since we want to do that 
	**	only once.
	*/
	SCR_FROM_REG (HS_REG),
		0,
	SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
		SIR_NEGO_FAILED,

}/*-----------------------< DISPATCH >----------------------*/,{
	/*
	**	MSG_IN is the only phase that shall be 
	**	entered at least once for each (re)selection.
	**	So we test it first.
	*/
	SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)),
		PADDR (msg_in),

	SCR_RETURN ^ IFTRUE (IF (SCR_DATA_OUT)),
		0,
	/*
	**	DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 4.
	**	Possible data corruption during Memory Write and Invalidate.
	**	This work-around resets the addressing logic prior to the 
	**	start of the first MOVE of a DATA IN phase.
	**	(See Documentation/scsi/ncr53c8xx.txt for more information)
	*/
	SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
		20,
	SCR_COPY (4),
		RADDR (scratcha),
		RADDR (scratcha),
	SCR_RETURN,
 		0,
	SCR_JUMP ^ IFTRUE (IF (SCR_STATUS)),
		PADDR (status),
	SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND)),
		PADDR (command),
	SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT)),
		PADDR (msg_out),
	/*
	**      Discard one illegal phase byte, if required.
	*/
	SCR_LOAD_REG (scratcha, XE_BAD_PHASE),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (xerr_st),
	SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_OUT)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_ILG_OUT,
		NADDR (scratch),
	SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_IN)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_ILG_IN,
		NADDR (scratch),
	SCR_JUMP,
		PADDR (dispatch),

}/*-------------------------< CLRACK >----------------------*/,{
	/*
	**	Terminate possible pending message phase.
	*/
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP,
		PADDR (dispatch),

}/*-------------------------< NO_DATA >--------------------*/,{
	/*
	**	The target wants to tranfer too much data
	**	or in the wrong direction.
	**      Remember that in extended error.
	*/
	SCR_LOAD_REG (scratcha, XE_EXTRA_DATA),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (xerr_st),
	/*
	**      Discard one data byte, if required.
	*/
	SCR_JUMPR ^ IFFALSE (WHEN (SCR_DATA_OUT)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_DATA_OUT,
		NADDR (scratch),
	SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
		NADDR (scratch),
	/*
	**      .. and repeat as required.
	*/
	SCR_CALL,
		PADDR (dispatch),
	SCR_JUMP,
		PADDR (no_data),

}/*-------------------------< STATUS >--------------------*/,{
	/*
	**	get the status
	*/
	SCR_MOVE_ABS (1) ^ SCR_STATUS,
		NADDR (scratch),
	/*
	**	save status to scsi_status.
	**	mark as complete.
	*/
	SCR_TO_REG (SS_REG),
		0,
	SCR_LOAD_REG (HS_REG, HS_COMPLETE),
		0,
	SCR_JUMP,
		PADDR (dispatch),
}/*-------------------------< MSG_IN >--------------------*/,{
	/*
	**	Get the first byte of the message
	**	and save it to SCRATCHA.
	**
	**	The script processor doesn't negate the
	**	ACK signal after this transfer.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin[0]),
}/*-------------------------< MSG_IN2 >--------------------*/,{
	/*
	**	Handle this message.
	*/
	SCR_JUMP ^ IFTRUE (DATA (COMMAND_COMPLETE)),
		PADDR (complete),
	SCR_JUMP ^ IFTRUE (DATA (DISCONNECT)),
		PADDR (disconnect),
	SCR_JUMP ^ IFTRUE (DATA (SAVE_POINTERS)),
		PADDR (save_dp),
	SCR_JUMP ^ IFTRUE (DATA (RESTORE_POINTERS)),
		PADDR (restore_dp),
	SCR_JUMP ^ IFTRUE (DATA (EXTENDED_MESSAGE)),
		PADDRH (msg_extended),
	SCR_JUMP ^ IFTRUE (DATA (NOP)),
		PADDR (clrack),
	SCR_JUMP ^ IFTRUE (DATA (MESSAGE_REJECT)),
		PADDRH (msg_reject),
	SCR_JUMP ^ IFTRUE (DATA (IGNORE_WIDE_RESIDUE)),
		PADDRH (msg_ign_residue),
	/*
	**	Rest of the messages left as
	**	an exercise ...
	**
	**	Unimplemented messages:
	**	fall through to MSG_BAD.
	*/
}/*-------------------------< MSG_BAD >------------------*/,{
	/*
	**	unimplemented message - reject it.
	*/
	SCR_INT,
		SIR_REJECT_SENT,
	SCR_LOAD_REG (scratcha, MESSAGE_REJECT),
		0,
}/*-------------------------< SETMSG >----------------------*/,{
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (msgout),
	SCR_SET (SCR_ATN),
		0,
	SCR_JUMP,
		PADDR (clrack),
}/*-------------------------< CLEANUP >-------------------*/,{
	/*
	**      dsa:    Pointer to ccb
	**	      or xxxxxxFF (no ccb)
	**
	**      HS_REG:   Host-Status (<>0!)
	*/
	SCR_FROM_REG (dsa),
		0,
	SCR_JUMP ^ IFTRUE (DATA (0xff)),
		PADDR (start),
	/*
	**      dsa is valid.
	**	complete the cleanup.
	*/
	SCR_JUMP,
		PADDR (cleanup_ok),

}/*-------------------------< COMPLETE >-----------------*/,{
	/*
	**	Complete message.
	**
	**	Copy TEMP register to LASTP in header.
	*/
	SCR_COPY (4),
		RADDR (temp),
		NADDR (header.lastp),
	/*
	**	When we terminate the cycle by clearing ACK,
	**	the target may disconnect immediately.
	**
	**	We don't want to be told of an
	**	"unexpected disconnect",
	**	so we disable this feature.
	*/
	SCR_REG_REG (scntl2, SCR_AND, 0x7f),
		0,
	/*
	**	Terminate cycle ...
	*/
	SCR_CLR (SCR_ACK|SCR_ATN),
		0,
	/*
	**	... and wait for the disconnect.
	*/
	SCR_WAIT_DISC,
		0,
}/*-------------------------< CLEANUP_OK >----------------*/,{
	/*
	**	Save host status to header.
	*/
	SCR_COPY (4),
		RADDR (scr0),
		NADDR (header.status),
	/*
	**	and copy back the header to the ccb.
	*/
	SCR_COPY_F (4),
		RADDR (dsa),
		PADDR (cleanup0),
	/*
	**	Flush script prefetch if required
	*/
	PREFETCH_FLUSH
	SCR_COPY (sizeof (struct head)),
		NADDR (header),
}/*-------------------------< CLEANUP0 >--------------------*/,{
		0,
}/*-------------------------< SIGNAL >----------------------*/,{
	/*
	**	if job not completed ...
	*/
	SCR_FROM_REG (HS_REG),
		0,
	/*
	**	... start the next command.
	*/
	SCR_JUMP ^ IFTRUE (MASK (0, (HS_DONEMASK|HS_SKIPMASK))),
		PADDR(start),
	/*
	**	If command resulted in not GOOD status,
	**	call the C code if needed.
	*/
	SCR_FROM_REG (SS_REG),
		0,
	SCR_CALL ^ IFFALSE (DATA (S_GOOD)),
		PADDRH (bad_status),

#ifndef	SCSI_NCR_CCB_DONE_SUPPORT

	/*
	**	... signal completion to the host
	*/
	SCR_INT,
		SIR_INTFLY,
	/*
	**	Auf zu neuen Schandtaten!
	*/
	SCR_JUMP,
		PADDR(start),

#else	/* defined SCSI_NCR_CCB_DONE_SUPPORT */

	/*
	**	... signal completion to the host
	*/
	SCR_JUMP,
}/*------------------------< DONE_POS >---------------------*/,{
		PADDRH (done_queue),
}/*------------------------< DONE_PLUG >--------------------*/,{
	SCR_INT,
		SIR_DONE_OVERFLOW,
}/*------------------------< DONE_END >---------------------*/,{
	SCR_INT,
		SIR_INTFLY,
	SCR_COPY (4),
		RADDR (temp),
		PADDR (done_pos),
	SCR_JUMP,
		PADDR (start),

#endif	/* SCSI_NCR_CCB_DONE_SUPPORT */

}/*-------------------------< SAVE_DP >------------------*/,{
	/*
	**	SAVE_DP message:
	**	Copy TEMP register to SAVEP in header.
	*/
	SCR_COPY (4),
		RADDR (temp),
		NADDR (header.savep),
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP,
		PADDR (dispatch),
}/*-------------------------< RESTORE_DP >---------------*/,{
	/*
	**	RESTORE_DP message:
	**	Copy SAVEP in header to TEMP register.
	*/
	SCR_COPY (4),
		NADDR (header.savep),
		RADDR (temp),
	SCR_JUMP,
		PADDR (clrack),

}/*-------------------------< DISCONNECT >---------------*/,{
	/*
	**	DISCONNECTing  ...
	**
	**	disable the "unexpected disconnect" feature,
	**	and remove the ACK signal.
	*/
	SCR_REG_REG (scntl2, SCR_AND, 0x7f),
		0,
	SCR_CLR (SCR_ACK|SCR_ATN),
		0,
	/*
	**	Wait for the disconnect.
	*/
	SCR_WAIT_DISC,
		0,
	/*
	**	Status is: DISCONNECTED.
	*/
	SCR_LOAD_REG (HS_REG, HS_DISCONNECT),
		0,
	SCR_JUMP,
		PADDR (cleanup_ok),

}/*-------------------------< MSG_OUT >-------------------*/,{
	/*
	**	The target requests a message.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
		NADDR (msgout),
	SCR_COPY (1),
		NADDR (msgout),
		NADDR (lastmsg),
	/*
	**	If it was no ABORT message ...
	*/
	SCR_JUMP ^ IFTRUE (DATA (ABORT_TASK_SET)),
		PADDRH (msg_out_abort),
	/*
	**	... wait for the next phase
	**	if it's a message out, send it again, ...
	*/
	SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
		PADDR (msg_out),
}/*-------------------------< MSG_OUT_DONE >--------------*/,{
	/*
	**	... else clear the message ...
	*/
	SCR_LOAD_REG (scratcha, NOP),
		0,
	SCR_COPY (4),
		RADDR (scratcha),
		NADDR (msgout),
	/*
	**	... and process the next phase
	*/
	SCR_JUMP,
		PADDR (dispatch),
}/*-------------------------< IDLE >------------------------*/,{
	/*
	**	Nothing to do?
	**	Wait for reselect.
	**	This NOP will be patched with LED OFF
	**	SCR_REG_REG (gpreg, SCR_OR, 0x01)
	*/
	SCR_NO_OP,
		0,
}/*-------------------------< RESELECT >--------------------*/,{
	/*
	**	make the DSA invalid.
	*/
	SCR_LOAD_REG (dsa, 0xff),
		0,
	SCR_CLR (SCR_TRG),
		0,
	SCR_LOAD_REG (HS_REG, HS_IN_RESELECT),
		0,
	/*
	**	Sleep waiting for a reselection.
	**	If SIGP is set, special treatment.
	**
	**	Zu allem bereit ..
	*/
	SCR_WAIT_RESEL,
		PADDR(start),
}/*-------------------------< RESELECTED >------------------*/,{
	/*
	**	This NOP will be patched with LED ON
	**	SCR_REG_REG (gpreg, SCR_AND, 0xfe)
	*/
	SCR_NO_OP,
		0,
	/*
	**	... zu nichts zu gebrauchen ?
	**
	**      load the target id into the SFBR
	**	and jump to the control block.
	**
	**	Look at the declarations of
	**	- struct ncb
	**	- struct tcb
	**	- struct lcb
	**	- struct ccb
	**	to understand what's going on.
	*/
	SCR_REG_SFBR (ssid, SCR_AND, 0x8F),
		0,
	SCR_TO_REG (sdid),
		0,
	SCR_JUMP,
		NADDR (jump_tcb),

}/*-------------------------< RESEL_DSA >-------------------*/,{
	/*
	**	Ack the IDENTIFY or TAG previously received.
	*/
	SCR_CLR (SCR_ACK),
		0,
	/*
	**      The ncr doesn't have an indirect load
	**	or store command. So we have to
	**	copy part of the control block to a
	**	fixed place, where we can access it.
	**
	**	We patch the address part of a
	**	COPY command with the DSA-register.
	*/
	SCR_COPY_F (4),
		RADDR (dsa),
		PADDR (loadpos1),
	/*
	**	Flush script prefetch if required
	*/
	PREFETCH_FLUSH
	/*
	**	then we do the actual copy.
	*/
	SCR_COPY (sizeof (struct head)),
	/*
	**	continued after the next label ...
	*/

}/*-------------------------< LOADPOS1 >-------------------*/,{
		0,
		NADDR (header),
	/*
	**	The DSA contains the data structure address.
	*/
	SCR_JUMP,
		PADDR (prepare),

}/*-------------------------< RESEL_LUN >-------------------*/,{
	/*
	**	come back to this point
	**	to get an IDENTIFY message
	**	Wait for a msg_in phase.
	*/
	SCR_INT ^ IFFALSE (WHEN (SCR_MSG_IN)),
		SIR_RESEL_NO_MSG_IN,
	/*
	**	message phase.
	**	Read the data directly from the BUS DATA lines.
	**	This helps to support very old SCSI devices that 
	**	may reselect without sending an IDENTIFY.
	*/
	SCR_FROM_REG (sbdl),
		0,
	/*
	**	It should be an Identify message.
	*/
	SCR_RETURN,
		0,
}/*-------------------------< RESEL_TAG >-------------------*/,{
	/*
	**	Read IDENTIFY + SIMPLE + TAG using a single MOVE.
	**	Agressive optimization, is'nt it?
	**	No need to test the SIMPLE TAG message, since the 
	**	driver only supports conformant devices for tags. ;-)
	*/
	SCR_MOVE_ABS (3) ^ SCR_MSG_IN,
		NADDR (msgin),
	/*
	**	Read the TAG from the SIDL.
	**	Still an aggressive optimization. ;-)
	**	Compute the CCB indirect jump address which 
	**	is (#TAG*2 & 0xfc) due to tag numbering using 
	**	1,3,5..MAXTAGS*2+1 actual values.
	*/
	SCR_REG_SFBR (sidl, SCR_SHL, 0),
		0,
	SCR_SFBR_REG (temp, SCR_AND, 0xfc),
		0,
}/*-------------------------< JUMP_TO_NEXUS >-------------------*/,{
	SCR_COPY_F (4),
		RADDR (temp),
		PADDR (nexus_indirect),
	/*
	**	Flush script prefetch if required
	*/
	PREFETCH_FLUSH
	SCR_COPY (4),
}/*-------------------------< NEXUS_INDIRECT >-------------------*/,{
		0,
		RADDR (temp),
	SCR_RETURN,
		0,
}/*-------------------------< RESEL_NOTAG >-------------------*/,{
	/*
	**	No tag expected.
	**	Read an throw away the IDENTIFY.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin),
	SCR_JUMP,
		PADDR (jump_to_nexus),
}/*-------------------------< DATA_IN >--------------------*/,{
/*
**	Because the size depends on the
**	#define MAX_SCATTERL parameter,
**	it is filled in at runtime.
**
**  ##===========< i=0; i<MAX_SCATTERL >=========
**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
**  ||		PADDR (dispatch),
**  ||	SCR_MOVE_TBL ^ SCR_DATA_IN,
**  ||		offsetof (struct dsb, data[ i]),
**  ##==========================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< DATA_IN2 >-------------------*/,{
	SCR_CALL,
		PADDR (dispatch),
	SCR_JUMP,
		PADDR (no_data),
}/*-------------------------< DATA_OUT >--------------------*/,{
/*
**	Because the size depends on the
**	#define MAX_SCATTERL parameter,
**	it is filled in at runtime.
**
**  ##===========< i=0; i<MAX_SCATTERL >=========
**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
**  ||		PADDR (dispatch),
**  ||	SCR_MOVE_TBL ^ SCR_DATA_OUT,
**  ||		offsetof (struct dsb, data[ i]),
**  ##==========================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< DATA_OUT2 >-------------------*/,{
	SCR_CALL,
		PADDR (dispatch),
	SCR_JUMP,
		PADDR (no_data),
}/*--------------------------------------------------------*/
};

static	struct scripth scripth0 __initdata = {
/*-------------------------< TRYLOOP >---------------------*/{
/*
**	Start the next entry.
**	Called addresses point to the launch script in the CCB.
**	They are patched by the main processor.
**
**	Because the size depends on the
**	#define MAX_START parameter, it is filled
**	in at runtime.
**
**-----------------------------------------------------------
**
**  ##===========< I=0; i<MAX_START >===========
**  ||	SCR_CALL,
**  ||		PADDR (idle),
**  ##==========================================
**
**-----------------------------------------------------------
*/
0
}/*------------------------< TRYLOOP2 >---------------------*/,{
	SCR_JUMP,
		PADDRH(tryloop),

#ifdef SCSI_NCR_CCB_DONE_SUPPORT

}/*------------------------< DONE_QUEUE >-------------------*/,{
/*
**	Copy the CCB address to the next done entry.
**	Because the size depends on the
**	#define MAX_DONE parameter, it is filled
**	in at runtime.
**
**-----------------------------------------------------------
**
**  ##===========< I=0; i<MAX_DONE >===========
**  ||	SCR_COPY (sizeof(struct ccb *),
**  ||		NADDR (header.cp),
**  ||		NADDR (ccb_done[i]),
**  ||	SCR_CALL,
**  ||		PADDR (done_end),
**  ##==========================================
**
**-----------------------------------------------------------
*/
0
}/*------------------------< DONE_QUEUE2 >------------------*/,{
	SCR_JUMP,
		PADDRH (done_queue),

#endif /* SCSI_NCR_CCB_DONE_SUPPORT */
}/*------------------------< SELECT_NO_ATN >-----------------*/,{
	/*
	**	Set Initiator mode.
	**      And try to select this target without ATN.
	*/

	SCR_CLR (SCR_TRG),
		0,
	SCR_LOAD_REG (HS_REG, HS_SELECTING),
		0,
	SCR_SEL_TBL ^ offsetof (struct dsb, select),
		PADDR (reselect),
	SCR_JUMP,
		PADDR (select2),

}/*-------------------------< CANCEL >------------------------*/,{

	SCR_LOAD_REG (scratcha, HS_ABORTED),
		0,
	SCR_JUMPR,
		8,
}/*-------------------------< SKIP >------------------------*/,{
	SCR_LOAD_REG (scratcha, 0),
		0,
	/*
	**	This entry has been canceled.
	**	Next time use the next slot.
	*/
	SCR_COPY (4),
		RADDR (temp),
		PADDR (startpos),
	/*
	**      The ncr doesn't have an indirect load
	**	or store command. So we have to
	**	copy part of the control block to a
	**	fixed place, where we can access it.
	**
	**	We patch the address part of a
	**	COPY command with the DSA-register.
	*/
	SCR_COPY_F (4),
		RADDR (dsa),
		PADDRH (skip2),
	/*
	**	Flush script prefetch if required
	*/
	PREFETCH_FLUSH
	/*
	**	then we do the actual copy.
	*/
	SCR_COPY (sizeof (struct head)),
	/*
	**	continued after the next label ...
	*/
}/*-------------------------< SKIP2 >---------------------*/,{
		0,
		NADDR (header),
	/*
	**      Initialize the status registers
	*/
	SCR_COPY (4),
		NADDR (header.status),
		RADDR (scr0),
	/*
	**	Force host status.
	*/
	SCR_FROM_REG (scratcha),
		0,
	SCR_JUMPR ^ IFFALSE (MASK (0, HS_DONEMASK)),
		16,
	SCR_REG_REG (HS_REG, SCR_OR, HS_SKIPMASK),
		0,
	SCR_JUMPR,
		8,
	SCR_TO_REG (HS_REG),
		0,
	SCR_LOAD_REG (SS_REG, S_GOOD),
		0,
	SCR_JUMP,
		PADDR (cleanup_ok),

},/*-------------------------< PAR_ERR_DATA_IN >---------------*/{
	/*
	**	Ignore all data in byte, until next phase
	*/
	SCR_JUMP ^ IFFALSE (WHEN (SCR_DATA_IN)),
		PADDRH (par_err_other),
	SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
		NADDR (scratch),
	SCR_JUMPR,
		-24,
},/*-------------------------< PAR_ERR_OTHER >------------------*/{
	/*
	**	count it.
	*/
	SCR_REG_REG (PS_REG, SCR_ADD, 0x01),
		0,
	/*
	**	jump to dispatcher.
	*/
	SCR_JUMP,
		PADDR (dispatch),
}/*-------------------------< MSG_REJECT >---------------*/,{
	/*
	**	If a negotiation was in progress,
	**	negotiation failed.
	**	Otherwise, let the C code print 
	**	some message.
	*/
	SCR_FROM_REG (HS_REG),
		0,
	SCR_INT ^ IFFALSE (DATA (HS_NEGOTIATE)),
		SIR_REJECT_RECEIVED,
	SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
		SIR_NEGO_FAILED,
	SCR_JUMP,
		PADDR (clrack),

}/*-------------------------< MSG_IGN_RESIDUE >----------*/,{
	/*
	**	Terminate cycle
	*/
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
		PADDR (dispatch),
	/*
	**	get residue size.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin[1]),
	/*
	**	Size is 0 .. ignore message.
	*/
	SCR_JUMP ^ IFTRUE (DATA (0)),
		PADDR (clrack),
	/*
	**	Size is not 1 .. have to interrupt.
	*/
	SCR_JUMPR ^ IFFALSE (DATA (1)),
		40,
	/*
	**	Check for residue byte in swide register
	*/
	SCR_FROM_REG (scntl2),
		0,
	SCR_JUMPR ^ IFFALSE (MASK (WSR, WSR)),
		16,
	/*
	**	There IS data in the swide register.
	**	Discard it.
	*/
	SCR_REG_REG (scntl2, SCR_OR, WSR),
		0,
	SCR_JUMP,
		PADDR (clrack),
	/*
	**	Load again the size to the sfbr register.
	*/
	SCR_FROM_REG (scratcha),
		0,
	SCR_INT,
		SIR_IGN_RESIDUE,
	SCR_JUMP,
		PADDR (clrack),

}/*-------------------------< MSG_EXTENDED >-------------*/,{
	/*
	**	Terminate cycle
	*/
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
		PADDR (dispatch),
	/*
	**	get length.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin[1]),
	/*
	*/
	SCR_JUMP ^ IFTRUE (DATA (3)),
		PADDRH (msg_ext_3),
	SCR_JUMP ^ IFFALSE (DATA (2)),
		PADDR (msg_bad),
}/*-------------------------< MSG_EXT_2 >----------------*/,{
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
		PADDR (dispatch),
	/*
	**	get extended message code.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin[2]),
	SCR_JUMP ^ IFTRUE (DATA (EXTENDED_WDTR)),
		PADDRH (msg_wdtr),
	/*
	**	unknown extended message
	*/
	SCR_JUMP,
		PADDR (msg_bad)
}/*-------------------------< MSG_WDTR >-----------------*/,{
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
		PADDR (dispatch),
	/*
	**	get data bus width
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin[3]),
	/*
	**	let the host do the real work.
	*/
	SCR_INT,
		SIR_NEGO_WIDE,
	/*
	**	let the target fetch our answer.
	*/
	SCR_SET (SCR_ATN),
		0,
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
		PADDRH (nego_bad_phase),

}/*-------------------------< SEND_WDTR >----------------*/,{
	/*
	**	Send the EXTENDED_WDTR
	*/
	SCR_MOVE_ABS (4) ^ SCR_MSG_OUT,
		NADDR (msgout),
	SCR_COPY (1),
		NADDR (msgout),
		NADDR (lastmsg),
	SCR_JUMP,
		PADDR (msg_out_done),

}/*-------------------------< MSG_EXT_3 >----------------*/,{
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
		PADDR (dispatch),
	/*
	**	get extended message code.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin[2]),
	SCR_JUMP ^ IFTRUE (DATA (EXTENDED_SDTR)),
		PADDRH (msg_sdtr),
	/*
	**	unknown extended message
	*/
	SCR_JUMP,
		PADDR (msg_bad)

}/*-------------------------< MSG_SDTR >-----------------*/,{
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
		PADDR (dispatch),
	/*
	**	get period and offset
	*/
	SCR_MOVE_ABS (2) ^ SCR_MSG_IN,
		NADDR (msgin[3]),
	/*
	**	let the host do the real work.
	*/
	SCR_INT,
		SIR_NEGO_SYNC,
	/*
	**	let the target fetch our answer.
	*/
	SCR_SET (SCR_ATN),
		0,
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
		PADDRH (nego_bad_phase),

}/*-------------------------< SEND_SDTR >-------------*/,{
	/*
	**	Send the EXTENDED_SDTR
	*/
	SCR_MOVE_ABS (5) ^ SCR_MSG_OUT,
		NADDR (msgout),
	SCR_COPY (1),
		NADDR (msgout),
		NADDR (lastmsg),
	SCR_JUMP,
		PADDR (msg_out_done),

}/*-------------------------< NEGO_BAD_PHASE >------------*/,{
	SCR_INT,
		SIR_NEGO_PROTO,
	SCR_JUMP,
		PADDR (dispatch),

}/*-------------------------< MSG_OUT_ABORT >-------------*/,{
	/*
	**	After ABORT message,
	**
	**	expect an immediate disconnect, ...
	*/
	SCR_REG_REG (scntl2, SCR_AND, 0x7f),
		0,
	SCR_CLR (SCR_ACK|SCR_ATN),
		0,
	SCR_WAIT_DISC,
		0,
	/*
	**	... and set the status to "ABORTED"
	*/
	SCR_LOAD_REG (HS_REG, HS_ABORTED),
		0,
	SCR_JUMP,
		PADDR (cleanup),

}/*-------------------------< HDATA_IN >-------------------*/,{
/*
**	Because the size depends on the
**	#define MAX_SCATTERH parameter,
**	it is filled in at runtime.
**
**  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
**  ||		PADDR (dispatch),
**  ||	SCR_MOVE_TBL ^ SCR_DATA_IN,
**  ||		offsetof (struct dsb, data[ i]),
**  ##===================================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< HDATA_IN2 >------------------*/,{
	SCR_JUMP,
		PADDR (data_in),

}/*-------------------------< HDATA_OUT >-------------------*/,{
/*
**	Because the size depends on the
**	#define MAX_SCATTERH parameter,
**	it is filled in at runtime.
**
**  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
**  ||		PADDR (dispatch),
**  ||	SCR_MOVE_TBL ^ SCR_DATA_OUT,
**  ||		offsetof (struct dsb, data[ i]),
**  ##===================================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< HDATA_OUT2 >------------------*/,{
	SCR_JUMP,
		PADDR (data_out),

}/*-------------------------< RESET >----------------------*/,{
	/*
	**      Send a TARGET_RESET message if bad IDENTIFY 
	**	received on reselection.
	*/
	SCR_LOAD_REG (scratcha, ABORT_TASK),
		0,
	SCR_JUMP,
		PADDRH (abort_resel),
}/*-------------------------< ABORTTAG >-------------------*/,{
	/*
	**      Abort a wrong tag received on reselection.
	*/
	SCR_LOAD_REG (scratcha, ABORT_TASK),
		0,
	SCR_JUMP,
		PADDRH (abort_resel),
}/*-------------------------< ABORT >----------------------*/,{
	/*
	**      Abort a reselection when no active CCB.
	*/
	SCR_LOAD_REG (scratcha, ABORT_TASK_SET),
		0,
}/*-------------------------< ABORT_RESEL >----------------*/,{
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (msgout),
	SCR_SET (SCR_ATN),
		0,
	SCR_CLR (SCR_ACK),
		0,
	/*
	**	and send it.
	**	we expect an immediate disconnect
	*/
	SCR_REG_REG (scntl2, SCR_AND, 0x7f),
		0,
	SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
		NADDR (msgout),
	SCR_COPY (1),
		NADDR (msgout),
		NADDR (lastmsg),
	SCR_CLR (SCR_ACK|SCR_ATN),
		0,
	SCR_WAIT_DISC,
		0,
	SCR_JUMP,
		PADDR (start),
}/*-------------------------< RESEND_IDENT >-------------------*/,{
	/*
	**	The target stays in MSG OUT phase after having acked 
	**	Identify [+ Tag [+ Extended message ]]. Targets shall
	**	behave this way on parity error.
	**	We must send it again all the messages.
	*/
	SCR_SET (SCR_ATN), /* Shall be asserted 2 deskew delays before the  */
		0,         /* 1rst ACK = 90 ns. Hope the NCR is'nt too fast */
	SCR_JUMP,
		PADDR (send_ident),
}/*-------------------------< CLRATN_GO_ON >-------------------*/,{
	SCR_CLR (SCR_ATN),
		0,
	SCR_JUMP,
}/*-------------------------< NXTDSP_GO_ON >-------------------*/,{
		0,
}/*-------------------------< SDATA_IN >-------------------*/,{
	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
		PADDR (dispatch),
	SCR_MOVE_TBL ^ SCR_DATA_IN,
		offsetof (struct dsb, sense),
	SCR_CALL,
		PADDR (dispatch),
	SCR_JUMP,
		PADDR (no_data),
}/*-------------------------< DATA_IO >--------------------*/,{
	/*
	**	We jump here if the data direction was unknown at the 
	**	time we had to queue the command to the scripts processor.
	**	Pointers had been set as follow in this situation:
	**	  savep   -->   DATA_IO
	**	  lastp   -->   start pointer when DATA_IN
	**	  goalp   -->   goal  pointer when DATA_IN
	**	  wlastp  -->   start pointer when DATA_OUT
	**	  wgoalp  -->   goal  pointer when DATA_OUT
	**	This script sets savep/lastp/goalp according to the 
	**	direction chosen by the target.
	*/
	SCR_JUMPR ^ IFTRUE (WHEN (SCR_DATA_OUT)),
		32,
	/*
	**	Direction is DATA IN.
	**	Warning: we jump here, even when phase is DATA OUT.
	*/
	SCR_COPY (4),
		NADDR (header.lastp),
		NADDR (header.savep),

	/*
	**	Jump to the SCRIPTS according to actual direction.
	*/
	SCR_COPY (4),
		NADDR (header.savep),
		RADDR (temp),
	SCR_RETURN,
		0,
	/*
	**	Direction is DATA OUT.
	*/
	SCR_COPY (4),
		NADDR (header.wlastp),
		NADDR (header.lastp),
	SCR_COPY (4),
		NADDR (header.wgoalp),
		NADDR (header.goalp),
	SCR_JUMPR,
		-64,
}/*-------------------------< BAD_IDENTIFY >---------------*/,{
	/*
	**	If message phase but not an IDENTIFY,
	**	get some help from the C code.
	**	Old SCSI device may behave so.
	*/
	SCR_JUMPR ^ IFTRUE (MASK (0x80, 0x80)),
		16,
	SCR_INT,
		SIR_RESEL_NO_IDENTIFY,
	SCR_JUMP,
		PADDRH (reset),
	/*
	**	Message is an IDENTIFY, but lun is unknown.
	**	Read the message, since we got it directly 
	**	from the SCSI BUS data lines.
	**	Signal problem to C code for logging the event.
	**	Send an ABORT_TASK_SET to clear all pending tasks.
	*/
	SCR_INT,
		SIR_RESEL_BAD_LUN,
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin),
	SCR_JUMP,
		PADDRH (abort),
}/*-------------------------< BAD_I_T_L >------------------*/,{
	/*
	**	We donnot have a task for that I_T_L.
	**	Signal problem to C code for logging the event.
	**	Send an ABORT_TASK_SET message.
	*/
	SCR_INT,
		SIR_RESEL_BAD_I_T_L,
	SCR_JUMP,
		PADDRH (abort),
}/*-------------------------< BAD_I_T_L_Q >----------------*/,{
	/*
	**	We donnot have a task that matches the tag.
	**	Signal problem to C code for logging the event.
	**	Send an ABORT_TASK message.
	*/
	SCR_INT,
		SIR_RESEL_BAD_I_T_L_Q,
	SCR_JUMP,
		PADDRH (aborttag),
}/*-------------------------< BAD_TARGET >-----------------*/,{
	/*
	**	We donnot know the target that reselected us.
	**	Grab the first message if any (IDENTIFY).
	**	Signal problem to C code for logging the event.
	**	TARGET_RESET message.
	*/
	SCR_INT,
		SIR_RESEL_BAD_TARGET,
	SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_IN)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin),
	SCR_JUMP,
		PADDRH (reset),
}/*-------------------------< BAD_STATUS >-----------------*/,{
	/*
	**	If command resulted in either QUEUE FULL,
	**	CHECK CONDITION or COMMAND TERMINATED,
	**	call the C code.
	*/
	SCR_INT ^ IFTRUE (DATA (S_QUEUE_FULL)),
		SIR_BAD_STATUS,
	SCR_INT ^ IFTRUE (DATA (S_CHECK_COND)),
		SIR_BAD_STATUS,
	SCR_INT ^ IFTRUE (DATA (S_TERMINATED)),
		SIR_BAD_STATUS,
	SCR_RETURN,
		0,
}/*-------------------------< START_RAM >-------------------*/,{
	/*
	**	Load the script into on-chip RAM, 
	**	and jump to start point.
	*/
	SCR_COPY_F (4),
		RADDR (scratcha),
		PADDRH (start_ram0),
	/*
	**	Flush script prefetch if required
	*/
	PREFETCH_FLUSH
	SCR_COPY (sizeof (struct script)),
}/*-------------------------< START_RAM0 >--------------------*/,{
		0,
		PADDR (start),
	SCR_JUMP,
		PADDR (start),
}/*-------------------------< STO_RESTART >-------------------*/,{
	/*
	**
	**	Repair start queue (e.g. next time use the next slot) 
	**	and jump to start point.
	*/
	SCR_COPY (4),
		RADDR (temp),
		PADDR (startpos),
	SCR_JUMP,
		PADDR (start),
}/*-------------------------< WAIT_DMA >-------------------*/,{
	/*
	**	For HP Zalon/53c720 systems, the Zalon interface
	**	between CPU and 53c720 does prefetches, which causes
	**	problems with self modifying scripts.  The problem
	**	is overcome by calling a dummy subroutine after each
	**	modification, to force a refetch of the script on
	**	return from the subroutine.
	*/
	SCR_RETURN,
		0,
}/*-------------------------< SNOOPTEST >-------------------*/,{
	/*
	**	Read the variable.
	*/
	SCR_COPY (4),
		NADDR(ncr_cache),
		RADDR (scratcha),
	/*
	**	Write the variable.
	*/
	SCR_COPY (4),
		RADDR (temp),
		NADDR(ncr_cache),
	/*
	**	Read back the variable.
	*/
	SCR_COPY (4),
		NADDR(ncr_cache),
		RADDR (temp),
}/*-------------------------< SNOOPEND >-------------------*/,{
	/*
	**	And stop.
	*/
	SCR_INT,
		99,
}/*--------------------------------------------------------*/
};

/*==========================================================
**
**
**	Fill in #define dependent parts of the script
**
**
**==========================================================
*/

void __init ncr_script_fill (struct script * scr, struct scripth * scrh)
{
	int	i;
	ncrcmd	*p;

	p = scrh->tryloop;
	for (i=0; i<MAX_START; i++) {
		*p++ =SCR_CALL;
		*p++ =PADDR (idle);
	}

	BUG_ON((u_long)p != (u_long)&scrh->tryloop + sizeof (scrh->tryloop));

#ifdef SCSI_NCR_CCB_DONE_SUPPORT

	p = scrh->done_queue;
	for (i = 0; i<MAX_DONE; i++) {
		*p++ =SCR_COPY (sizeof(struct ccb *));
		*p++ =NADDR (header.cp);
		*p++ =NADDR (ccb_done[i]);
		*p++ =SCR_CALL;
		*p++ =PADDR (done_end);
	}

	BUG_ON((u_long)p != (u_long)&scrh->done_queue+sizeof(scrh->done_queue));

#endif /* SCSI_NCR_CCB_DONE_SUPPORT */

	p = scrh->hdata_in;
	for (i=0; i<MAX_SCATTERH; i++) {
		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
		*p++ =PADDR (dispatch);
		*p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
		*p++ =offsetof (struct dsb, data[i]);
	}

	BUG_ON((u_long)p != (u_long)&scrh->hdata_in + sizeof (scrh->hdata_in));

	p = scr->data_in;
	for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
		*p++ =PADDR (dispatch);
		*p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
		*p++ =offsetof (struct dsb, data[i]);
	}

	BUG_ON((u_long)p != (u_long)&scr->data_in + sizeof (scr->data_in));

	p = scrh->hdata_out;
	for (i=0; i<MAX_SCATTERH; i++) {
		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
		*p++ =PADDR (dispatch);
		*p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
		*p++ =offsetof (struct dsb, data[i]);
	}

	BUG_ON((u_long)p != (u_long)&scrh->hdata_out + sizeof (scrh->hdata_out));

	p = scr->data_out;
	for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
		*p++ =PADDR (dispatch);
		*p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
		*p++ =offsetof (struct dsb, data[i]);
	}

	BUG_ON((u_long) p != (u_long)&scr->data_out + sizeof (scr->data_out));
}

/*==========================================================
**
**
**	Copy and rebind a script.
**
**
**==========================================================
*/

static void __init 
ncr_script_copy_and_bind (struct ncb *np, ncrcmd *src, ncrcmd *dst, int len)
{
	ncrcmd  opcode, new, old, tmp1, tmp2;
	ncrcmd	*start, *end;
	int relocs;
	int opchanged = 0;

	start = src;
	end = src + len/4;

	while (src < end) {

		opcode = *src++;
		*dst++ = cpu_to_scr(opcode);

		/*
		**	If we forget to change the length
		**	in struct script, a field will be
		**	padded with 0. This is an illegal
		**	command.
		*/

		if (opcode == 0) {
			printk (KERN_ERR "%s: ERROR0 IN SCRIPT at %d.\n",
				ncr_name(np), (int) (src-start-1));
			mdelay(1000);
		}

		if (DEBUG_FLAGS & DEBUG_SCRIPT)
			printk (KERN_DEBUG "%p:  <%x>\n",
				(src-1), (unsigned)opcode);

		/*
		**	We don't have to decode ALL commands
		*/
		switch (opcode >> 28) {

		case 0xc:
			/*
			**	COPY has TWO arguments.
			*/
			relocs = 2;
			tmp1 = src[0];
#ifdef	RELOC_KVAR
			if ((tmp1 & RELOC_MASK) == RELOC_KVAR)
				tmp1 = 0;
#endif
			tmp2 = src[1];
#ifdef	RELOC_KVAR
			if ((tmp2 & RELOC_MASK) == RELOC_KVAR)
				tmp2 = 0;
#endif
			if ((tmp1 ^ tmp2) & 3) {
				printk (KERN_ERR"%s: ERROR1 IN SCRIPT at %d.\n",
					ncr_name(np), (int) (src-start-1));
				mdelay(1000);
			}
			/*
			**	If PREFETCH feature not enabled, remove 
			**	the NO FLUSH bit if present.
			*/
			if ((opcode & SCR_NO_FLUSH) && !(np->features & FE_PFEN)) {
				dst[-1] = cpu_to_scr(opcode & ~SCR_NO_FLUSH);
				++opchanged;
			}
			break;

		case 0x0:
			/*
			**	MOVE (absolute address)
			*/
			relocs = 1;
			break;

		case 0x8:
			/*
			**	JUMP / CALL
			**	don't relocate if relative :-)
			*/
			if (opcode & 0x00800000)
				relocs = 0;
			else
				relocs = 1;
			break;

		case 0x4:
		case 0x5:
		case 0x6:
		case 0x7:
			relocs = 1;
			break;

		default:
			relocs = 0;
			break;
		}

		if (relocs) {
			while (relocs--) {
				old = *src++;

				switch (old & RELOC_MASK) {
				case RELOC_REGISTER:
					new = (old & ~RELOC_MASK) + np->paddr;
					break;
				case RELOC_LABEL:
					new = (old & ~RELOC_MASK) + np->p_script;
					break;
				case RELOC_LABELH:
					new = (old & ~RELOC_MASK) + np->p_scripth;
					break;
				case RELOC_SOFTC:
					new = (old & ~RELOC_MASK) + np->p_ncb;
					break;
#ifdef	RELOC_KVAR
				case RELOC_KVAR:
					if (((old & ~RELOC_MASK) <
					     SCRIPT_KVAR_FIRST) ||
					    ((old & ~RELOC_MASK) >
					     SCRIPT_KVAR_LAST))
						panic("ncr KVAR out of range");
					new = vtophys(script_kvars[old &
					    ~RELOC_MASK]);
					break;
#endif
				case 0:
					/* Don't relocate a 0 address. */
					if (old == 0) {
						new = old;
						break;
					}
					/* fall through */
				default:
					panic("ncr_script_copy_and_bind: weird relocation %x\n", old);
					break;
				}

				*dst++ = cpu_to_scr(new);
			}
		} else
			*dst++ = cpu_to_scr(*src++);

	}
}

/*
**	Linux host data structure
*/

struct host_data {
     struct ncb *ncb;
};

#define PRINT_ADDR(cmd, arg...) dev_info(&cmd->device->sdev_gendev , ## arg)

static void ncr_print_msg(struct ccb *cp, char *label, u_char *msg)
{
	PRINT_ADDR(cp->cmd, "%s: ", label);

	spi_print_msg(msg);
	printk("\n");
}

/*==========================================================
**
**	NCR chip clock divisor table.
**	Divisors are multiplied by 10,000,000 in order to make 
**	calculations more simple.
**
**==========================================================
*/

#define _5M 5000000
static u_long div_10M[] =
	{2*_5M, 3*_5M, 4*_5M, 6*_5M, 8*_5M, 12*_5M, 16*_5M};


/*===============================================================
**
**	Prepare io register values used by ncr_init() according 
**	to selected and supported features.
**
**	NCR chips allow burst lengths of 2, 4, 8, 16, 32, 64, 128 
**	transfers. 32,64,128 are only supported by 875 and 895 chips.
**	We use log base 2 (burst length) as internal code, with 
**	value 0 meaning "burst disabled".
**
**===============================================================
*/

/*
 *	Burst length from burst code.
 */
#define burst_length(bc) (!(bc))? 0 : 1 << (bc)

/*
 *	Burst code from io register bits.  Burst enable is ctest0 for c720
 */
#define burst_code(dmode, ctest0) \
	(ctest0) & 0x80 ? 0 : (((dmode) & 0xc0) >> 6) + 1

/*
 *	Set initial io register bits from burst code.
 */
static inline void ncr_init_burst(struct ncb *np, u_char bc)
{
	u_char *be = &np->rv_ctest0;
	*be		&= ~0x80;
	np->rv_dmode	&= ~(0x3 << 6);
	np->rv_ctest5	&= ~0x4;

	if (!bc) {
		*be		|= 0x80;
	} else {
		--bc;
		np->rv_dmode	|= ((bc & 0x3) << 6);
		np->rv_ctest5	|= (bc & 0x4);
	}
}

static void __init ncr_prepare_setting(struct ncb *np)
{
	u_char	burst_max;
	u_long	period;
	int i;

	/*
	**	Save assumed BIOS setting
	*/

	np->sv_scntl0	= INB(nc_scntl0) & 0x0a;
	np->sv_scntl3	= INB(nc_scntl3) & 0x07;
	np->sv_dmode	= INB(nc_dmode)  & 0xce;
	np->sv_dcntl	= INB(nc_dcntl)  & 0xa8;
	np->sv_ctest0	= INB(nc_ctest0) & 0x84;
	np->sv_ctest3	= INB(nc_ctest3) & 0x01;
	np->sv_ctest4	= INB(nc_ctest4) & 0x80;
	np->sv_ctest5	= INB(nc_ctest5) & 0x24;
	np->sv_gpcntl	= INB(nc_gpcntl);
	np->sv_stest2	= INB(nc_stest2) & 0x20;
	np->sv_stest4	= INB(nc_stest4);

	/*
	**	Wide ?
	*/

	np->maxwide	= (np->features & FE_WIDE)? 1 : 0;

 	/*
	 *  Guess the frequency of the chip's clock.
	 */
	if (np->features & FE_ULTRA)
		np->clock_khz = 80000;
	else
		np->clock_khz = 40000;

	/*
	 *  Get the clock multiplier factor.
 	 */
	if	(np->features & FE_QUAD)
		np->multiplier	= 4;
	else if	(np->features & FE_DBLR)
		np->multiplier	= 2;
	else
		np->multiplier	= 1;

	/*
	 *  Measure SCSI clock frequency for chips 
	 *  it may vary from assumed one.
	 */
	if (np->features & FE_VARCLK)
		ncr_getclock(np, np->multiplier);

	/*
	 * Divisor to be used for async (timer pre-scaler).
	 */
	i = np->clock_divn - 1;
	while (--i >= 0) {
		if (10ul * SCSI_NCR_MIN_ASYNC * np->clock_khz > div_10M[i]) {
			++i;
			break;
		}
	}
	np->rv_scntl3 = i+1;

	/*
	 * Minimum synchronous period factor supported by the chip.
	 * Btw, 'period' is in tenths of nanoseconds.
	 */

	period = (4 * div_10M[0] + np->clock_khz - 1) / np->clock_khz;
	if	(period <= 250)		np->minsync = 10;
	else if	(period <= 303)		np->minsync = 11;
	else if	(period <= 500)		np->minsync = 12;
	else				np->minsync = (period + 40 - 1) / 40;

	/*
	 * Check against chip SCSI standard support (SCSI-2,ULTRA,ULTRA2).
	 */

	if	(np->minsync < 25 && !(np->features & FE_ULTRA))
		np->minsync = 25;

	/*
	 * Maximum synchronous period factor supported by the chip.
	 */

	period = (11 * div_10M[np->clock_divn - 1]) / (4 * np->clock_khz);
	np->maxsync = period > 2540 ? 254 : period / 10;

	/*
	**	Prepare initial value of other IO registers
	*/
#if defined SCSI_NCR_TRUST_BIOS_SETTING
	np->rv_scntl0	= np->sv_scntl0;
	np->rv_dmode	= np->sv_dmode;
	np->rv_dcntl	= np->sv_dcntl;
	np->rv_ctest0	= np->sv_ctest0;
	np->rv_ctest3	= np->sv_ctest3;
	np->rv_ctest4	= np->sv_ctest4;
	np->rv_ctest5	= np->sv_ctest5;
	burst_max	= burst_code(np->sv_dmode, np->sv_ctest0);
#else

	/*
	**	Select burst length (dwords)
	*/
	burst_max	= driver_setup.burst_max;
	if (burst_max == 255)
		burst_max = burst_code(np->sv_dmode, np->sv_ctest0);
	if (burst_max > 7)
		burst_max = 7;
	if (burst_max > np->maxburst)
		burst_max = np->maxburst;

	/*
	**	Select all supported special features
	*/
	if (np->features & FE_ERL)
		np->rv_dmode	|= ERL;		/* Enable Read Line */
	if (np->features & FE_BOF)
		np->rv_dmode	|= BOF;		/* Burst Opcode Fetch */
	if (np->features & FE_ERMP)
		np->rv_dmode	|= ERMP;	/* Enable Read Multiple */
	if (np->features & FE_PFEN)
		np->rv_dcntl	|= PFEN;	/* Prefetch Enable */
	if (np->features & FE_CLSE)
		np->rv_dcntl	|= CLSE;	/* Cache Line Size Enable */
	if (np->features & FE_WRIE)
		np->rv_ctest3	|= WRIE;	/* Write and Invalidate */
	if (np->features & FE_DFS)
		np->rv_ctest5	|= DFS;		/* Dma Fifo Size */
	if (np->features & FE_MUX)
		np->rv_ctest4	|= MUX;		/* Host bus multiplex mode */
	if (np->features & FE_EA)
		np->rv_dcntl	|= EA;		/* Enable ACK */
	if (np->features & FE_EHP)
		np->rv_ctest0	|= EHP;		/* Even host parity */

	/*
	**	Select some other
	*/
	if (driver_setup.master_parity)
		np->rv_ctest4	|= MPEE;	/* Master parity checking */
	if (driver_setup.scsi_parity)
		np->rv_scntl0	|= 0x0a;	/*  full arb., ena parity, par->ATN  */

	/*
	**  Get SCSI addr of host adapter (set by bios?).
	*/
	if (np->myaddr == 255) {
		np->myaddr = INB(nc_scid) & 0x07;
		if (!np->myaddr)
			np->myaddr = SCSI_NCR_MYADDR;
	}

#endif /* SCSI_NCR_TRUST_BIOS_SETTING */

	/*
	 *	Prepare initial io register bits for burst length
	 */
	ncr_init_burst(np, burst_max);

	/*
	**	Set SCSI BUS mode.
	**
	**	- ULTRA2 chips (895/895A/896) report the current 
	**	  BUS mode through the STEST4 IO register.
	**	- For previous generation chips (825/825A/875), 
	**	  user has to tell us how to check against HVD, 
	**	  since a 100% safe algorithm is not possible.
	*/
	np->scsi_mode = SMODE_SE;
	if (np->features & FE_DIFF) {
		switch(driver_setup.diff_support) {
		case 4:	/* Trust previous settings if present, then GPIO3 */
			if (np->sv_scntl3) {
				if (np->sv_stest2 & 0x20)
					np->scsi_mode = SMODE_HVD;
				break;
			}
		case 3:	/* SYMBIOS controllers report HVD through GPIO3 */
			if (INB(nc_gpreg) & 0x08)
				break;
		case 2:	/* Set HVD unconditionally */
			np->scsi_mode = SMODE_HVD;
		case 1:	/* Trust previous settings for HVD */
			if (np->sv_stest2 & 0x20)
				np->scsi_mode = SMODE_HVD;
			break;
		default:/* Don't care about HVD */	
			break;
		}
	}
	if (np->scsi_mode == SMODE_HVD)
		np->rv_stest2 |= 0x20;

	/*
	**	Set LED support from SCRIPTS.
	**	Ignore this feature for boards known to use a 
	**	specific GPIO wiring and for the 895A or 896 
	**	that drive the LED directly.
	**	Also probe initial setting of GPIO0 as output.
	*/
	if ((driver_setup.led_pin) &&
	    !(np->features & FE_LEDC) && !(np->sv_gpcntl & 0x01))
		np->features |= FE_LED0;

	/*
	**	Set irq mode.
	*/
	switch(driver_setup.irqm & 3) {
	case 2:
		np->rv_dcntl	|= IRQM;
		break;
	case 1:
		np->rv_dcntl	|= (np->sv_dcntl & IRQM);
		break;
	default:
		break;
	}

	/*
	**	Configure targets according to driver setup.
	**	Allow to override sync, wide and NOSCAN from 
	**	boot command line.
	*/
	for (i = 0 ; i < MAX_TARGET ; i++) {
		struct tcb *tp = &np->target[i];

		tp->usrsync = driver_setup.default_sync;
		tp->usrwide = driver_setup.max_wide;
		tp->usrtags = MAX_TAGS;
		tp->period = 0xffff;
		if (!driver_setup.disconnection)
			np->target[i].usrflag = UF_NODISC;
	}

	/*
	**	Announce all that stuff to user.
	*/

	printk(KERN_INFO "%s: ID %d, Fast-%d%s%s\n", ncr_name(np),
		np->myaddr,
		np->minsync < 12 ? 40 : (np->minsync < 25 ? 20 : 10),
		(np->rv_scntl0 & 0xa)	? ", Parity Checking"	: ", NO Parity",
		(np->rv_stest2 & 0x20)	? ", Differential"	: "");

	if (bootverbose > 1) {
		printk (KERN_INFO "%s: initial SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
			"(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
			ncr_name(np), np->sv_scntl3, np->sv_dmode, np->sv_dcntl,
			np->sv_ctest3, np->sv_ctest4, np->sv_ctest5);

		printk (KERN_INFO "%s: final   SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
			"(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
			ncr_name(np), np->rv_scntl3, np->rv_dmode, np->rv_dcntl,
			np->rv_ctest3, np->rv_ctest4, np->rv_ctest5);
	}

	if (bootverbose && np->paddr2)
		printk (KERN_INFO "%s: on-chip RAM at 0x%lx\n",
			ncr_name(np), np->paddr2);
}

/*==========================================================
**
**
**	Done SCSI commands list management.
**
**	We donnot enter the scsi_done() callback immediately 
**	after a command has been seen as completed but we 
**	insert it into a list which is flushed outside any kind 
**	of driver critical section.
**	This allows to do minimal stuff under interrupt and 
**	inside critical sections and to also avoid locking up 
**	on recursive calls to driver entry points under SMP.
**	In fact, the only kernel point which is entered by the 
**	driver with a driver lock set is kmalloc(GFP_ATOMIC) 
**	that shall not reenter the driver under any circumstances,
**	AFAIK.
**
**==========================================================
*/
static inline void ncr_queue_done_cmd(struct ncb *np, struct scsi_cmnd *cmd)
{
	unmap_scsi_data(np, cmd);
	cmd->host_scribble = (char *) np->done_list;
	np->done_list = cmd;
}

static inline void ncr_flush_done_cmds(struct scsi_cmnd *lcmd)
{
	struct scsi_cmnd *cmd;

	while (lcmd) {
		cmd = lcmd;
		lcmd = (struct scsi_cmnd *) cmd->host_scribble;
		cmd->scsi_done(cmd);
	}
}

/*==========================================================
**
**
**	Prepare the next negotiation message if needed.
**
**	Fill in the part of message buffer that contains the 
**	negotiation and the nego_status field of the CCB.
**	Returns the size of the message in bytes.
**
**
**==========================================================
*/


static int ncr_prepare_nego(struct ncb *np, struct ccb *cp, u_char *msgptr)
{
	struct tcb *tp = &np->target[cp->target];
	int msglen = 0;
	int nego = 0;
	struct scsi_target *starget = tp->starget;

	/* negotiate wide transfers ?  */
	if (!tp->widedone) {
		if (spi_support_wide(starget)) {
			nego = NS_WIDE;
		} else
			tp->widedone=1;
	}

	/* negotiate synchronous transfers?  */
	if (!nego && !tp->period) {
		if (spi_support_sync(starget)) {
			nego = NS_SYNC;
		} else {
			tp->period  =0xffff;
			dev_info(&starget->dev, "target did not report SYNC.\n");
		}
	}

	switch (nego) {
	case NS_SYNC:
		msglen += spi_populate_sync_msg(msgptr + msglen,
				tp->maxoffs ? tp->minsync : 0, tp->maxoffs);
		break;
	case NS_WIDE:
		msglen += spi_populate_width_msg(msgptr + msglen, tp->usrwide);
		break;
	}

	cp->nego_status = nego;

	if (nego) {
		tp->nego_cp = cp;
		if (DEBUG_FLAGS & DEBUG_NEGO) {
			ncr_print_msg(cp, nego == NS_WIDE ?
					  "wide msgout":"sync_msgout", msgptr);
		}
	}

	return msglen;
}



/*==========================================================
**
**
**	Start execution of a SCSI command.
**	This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd)
{
	struct scsi_device *sdev = cmd->device;
	struct tcb *tp = &np->target[sdev->id];
	struct lcb *lp = tp->lp[sdev->lun];
	struct ccb *cp;

	int	segments;
	u_char	idmsg, *msgptr;
	u32	msglen;
	int	direction;
	u32	lastp, goalp;

	/*---------------------------------------------
	**
	**      Some shortcuts ...
	**
	**---------------------------------------------
	*/
	if ((sdev->id == np->myaddr	  ) ||
		(sdev->id >= MAX_TARGET) ||
		(sdev->lun    >= MAX_LUN   )) {
		return(DID_BAD_TARGET);
	}

	/*---------------------------------------------
	**
	**	Complete the 1st TEST UNIT READY command
	**	with error condition if the device is 
	**	flagged NOSCAN, in order to speed up 
	**	the boot.
	**
	**---------------------------------------------
	*/
	if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12) && 
	    (tp->usrflag & UF_NOSCAN)) {
		tp->usrflag &= ~UF_NOSCAN;
		return DID_BAD_TARGET;
	}

	if (DEBUG_FLAGS & DEBUG_TINY) {
		PRINT_ADDR(cmd, "CMD=%x ", cmd->cmnd[0]);
	}

	/*---------------------------------------------------
	**
	**	Assign a ccb / bind cmd.
	**	If resetting, shorten settle_time if necessary
	**	in order to avoid spurious timeouts.
	**	If resetting or no free ccb,
	**	insert cmd into the waiting list.
	**
	**----------------------------------------------------
	*/
	if (np->settle_time && cmd->request->timeout >= HZ) {
		u_long tlimit = jiffies + cmd->request->timeout - HZ;
		if (time_after(np->settle_time, tlimit))
			np->settle_time = tlimit;
	}

	if (np->settle_time || !(cp=ncr_get_ccb (np, cmd))) {
		insert_into_waiting_list(np, cmd);
		return(DID_OK);
	}
	cp->cmd = cmd;

	/*----------------------------------------------------
	**
	**	Build the identify / tag / sdtr message
	**
	**----------------------------------------------------
	*/

	idmsg = IDENTIFY(0, sdev->lun);

	if (cp ->tag != NO_TAG ||
		(cp != np->ccb && np->disc && !(tp->usrflag & UF_NODISC)))
		idmsg |= 0x40;

	msgptr = cp->scsi_smsg;
	msglen = 0;
	msgptr[msglen++] = idmsg;

	if (cp->tag != NO_TAG) {
		char order = np->order;

		/*
		**	Force ordered tag if necessary to avoid timeouts 
		**	and to preserve interactivity.
		*/
		if (lp && time_after(jiffies, lp->tags_stime)) {
			if (lp->tags_smap) {
				order = ORDERED_QUEUE_TAG;
				if ((DEBUG_FLAGS & DEBUG_TAGS)||bootverbose>2){ 
					PRINT_ADDR(cmd,
						"ordered tag forced.\n");
				}
			}
			lp->tags_stime = jiffies + 3*HZ;
			lp->tags_smap = lp->tags_umap;
		}

		if (order == 0) {
			/*
			**	Ordered write ops, unordered read ops.
			*/
			switch (cmd->cmnd[0]) {
			case 0x08:  /* READ_SMALL (6) */
			case 0x28:  /* READ_BIG  (10) */
			case 0xa8:  /* READ_HUGE (12) */
				order = SIMPLE_QUEUE_TAG;
				break;
			default:
				order = ORDERED_QUEUE_TAG;
			}
		}
		msgptr[msglen++] = order;
		/*
		**	Actual tags are numbered 1,3,5,..2*MAXTAGS+1,
		**	since we may have to deal with devices that have 
		**	problems with #TAG 0 or too great #TAG numbers.
		*/
		msgptr[msglen++] = (cp->tag << 1) + 1;
	}

	/*----------------------------------------------------
	**
	**	Build the data descriptors
	**
	**----------------------------------------------------
	*/

	direction = cmd->sc_data_direction;
	if (direction != DMA_NONE) {
		segments = ncr_scatter(np, cp, cp->cmd);
		if (segments < 0) {
			ncr_free_ccb(np, cp);
			return(DID_ERROR);
		}
	}
	else {
		cp->data_len = 0;
		segments = 0;
	}

	/*---------------------------------------------------
	**
	**	negotiation required?
	**
	**	(nego_status is filled by ncr_prepare_nego())
	**
	**---------------------------------------------------
	*/

	cp->nego_status = 0;

	if ((!tp->widedone || !tp->period) && !tp->nego_cp && lp) {
		msglen += ncr_prepare_nego (np, cp, msgptr + msglen);
	}

	/*----------------------------------------------------
	**
	**	Determine xfer direction.
	**
	**----------------------------------------------------
	*/
	if (!cp->data_len)
		direction = DMA_NONE;

	/*
	**	If data direction is BIDIRECTIONAL, speculate FROM_DEVICE
	**	but prepare alternate pointers for TO_DEVICE in case 
	**	of our speculation will be just wrong.
	**	SCRIPTS will swap values if needed.
	*/
	switch(direction) {
	case DMA_BIDIRECTIONAL:
	case DMA_TO_DEVICE:
		goalp = NCB_SCRIPT_PHYS (np, data_out2) + 8;
		if (segments <= MAX_SCATTERL)
			lastp = goalp - 8 - (segments * 16);
		else {
			lastp = NCB_SCRIPTH_PHYS (np, hdata_out2);
			lastp -= (segments - MAX_SCATTERL) * 16;
		}
		if (direction != DMA_BIDIRECTIONAL)
			break;
		cp->phys.header.wgoalp	= cpu_to_scr(goalp);
		cp->phys.header.wlastp	= cpu_to_scr(lastp);
		/* fall through */
	case DMA_FROM_DEVICE:
		goalp = NCB_SCRIPT_PHYS (np, data_in2) + 8;
		if (segments <= MAX_SCATTERL)
			lastp = goalp - 8 - (segments * 16);
		else {
			lastp = NCB_SCRIPTH_PHYS (np, hdata_in2);
			lastp -= (segments - MAX_SCATTERL) * 16;
		}
		break;
	default:
	case DMA_NONE:
		lastp = goalp = NCB_SCRIPT_PHYS (np, no_data);
		break;
	}

	/*
	**	Set all pointers values needed by SCRIPTS.
	**	If direction is unknown, start at data_io.
	*/
	cp->phys.header.lastp = cpu_to_scr(lastp);
	cp->phys.header.goalp = cpu_to_scr(goalp);

	if (direction == DMA_BIDIRECTIONAL)
		cp->phys.header.savep = 
			cpu_to_scr(NCB_SCRIPTH_PHYS (np, data_io));
	else
		cp->phys.header.savep= cpu_to_scr(lastp);

	/*
	**	Save the initial data pointer in order to be able 
	**	to redo the command.
	*/
	cp->startp = cp->phys.header.savep;

	/*----------------------------------------------------
	**
	**	fill in ccb
	**
	**----------------------------------------------------
	**
	**
	**	physical -> virtual backlink
	**	Generic SCSI command
	*/

	/*
	**	Startqueue
	*/
	cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
	cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_dsa));
	/*
	**	select
	*/
	cp->phys.select.sel_id		= sdev_id(sdev);
	cp->phys.select.sel_scntl3	= tp->wval;
	cp->phys.select.sel_sxfer	= tp->sval;
	/*
	**	message
	*/
	cp->phys.smsg.addr		= cpu_to_scr(CCB_PHYS (cp, scsi_smsg));
	cp->phys.smsg.size		= cpu_to_scr(msglen);

	/*
	**	command
	*/
	memcpy(cp->cdb_buf, cmd->cmnd, min_t(int, cmd->cmd_len, sizeof(cp->cdb_buf)));
	cp->phys.cmd.addr		= cpu_to_scr(CCB_PHYS (cp, cdb_buf[0]));
	cp->phys.cmd.size		= cpu_to_scr(cmd->cmd_len);

	/*
	**	status
	*/
	cp->actualquirks		= 0;
	cp->host_status			= cp->nego_status ? HS_NEGOTIATE : HS_BUSY;
	cp->scsi_status			= S_ILLEGAL;
	cp->parity_status		= 0;

	cp->xerr_status			= XE_OK;
#if 0
	cp->sync_status			= tp->sval;
	cp->wide_status			= tp->wval;
#endif

	/*----------------------------------------------------
	**
	**	Critical region: start this job.
	**
	**----------------------------------------------------
	*/

	/* activate this job.  */
	cp->magic		= CCB_MAGIC;

	/*
	**	insert next CCBs into start queue.
	**	2 max at a time is enough to flush the CCB wait queue.
	*/
	cp->auto_sense = 0;
	if (lp)
		ncr_start_next_ccb(np, lp, 2);
	else
		ncr_put_start_queue(np, cp);

	/* Command is successfully queued.  */

	return DID_OK;
}


/*==========================================================
**
**
**	Insert a CCB into the start queue and wake up the 
**	SCRIPTS processor.
**
**
**==========================================================
*/

static void ncr_start_next_ccb(struct ncb *np, struct lcb *lp, int maxn)
{
	struct list_head *qp;
	struct ccb *cp;

	if (lp->held_ccb)
		return;

	while (maxn-- && lp->queuedccbs < lp->queuedepth) {
		qp = ncr_list_pop(&lp->wait_ccbq);
		if (!qp)
			break;
		++lp->queuedccbs;
		cp = list_entry(qp, struct ccb, link_ccbq);
		list_add_tail(qp, &lp->busy_ccbq);
		lp->jump_ccb[cp->tag == NO_TAG ? 0 : cp->tag] =
			cpu_to_scr(CCB_PHYS (cp, restart));
		ncr_put_start_queue(np, cp);
	}
}

static void ncr_put_start_queue(struct ncb *np, struct ccb *cp)
{
	u16	qidx;

	/*
	**	insert into start queue.
	*/
	if (!np->squeueput) np->squeueput = 1;
	qidx = np->squeueput + 2;
	if (qidx >= MAX_START + MAX_START) qidx = 1;

	np->scripth->tryloop [qidx] = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
	MEMORY_BARRIER();
	np->scripth->tryloop [np->squeueput] = cpu_to_scr(CCB_PHYS (cp, start));

	np->squeueput = qidx;
	++np->queuedccbs;
	cp->queued = 1;

	if (DEBUG_FLAGS & DEBUG_QUEUE)
		printk ("%s: queuepos=%d.\n", ncr_name (np), np->squeueput);

	/*
	**	Script processor may be waiting for reselect.
	**	Wake it up.
	*/
	MEMORY_BARRIER();
	OUTB (nc_istat, SIGP);
}


static int ncr_reset_scsi_bus(struct ncb *np, int enab_int, int settle_delay)
{
	u32 term;
	int retv = 0;

	np->settle_time	= jiffies + settle_delay * HZ;

	if (bootverbose > 1)
		printk("%s: resetting, "
			"command processing suspended for %d seconds\n",
			ncr_name(np), settle_delay);

	ncr_chip_reset(np, 100);
	udelay(2000);	/* The 895 needs time for the bus mode to settle */
	if (enab_int)
		OUTW (nc_sien, RST);
	/*
	**	Enable Tolerant, reset IRQD if present and 
	**	properly set IRQ mode, prior to resetting the bus.
	*/
	OUTB (nc_stest3, TE);
	OUTB (nc_scntl1, CRST);
	udelay(200);

	if (!driver_setup.bus_check)
		goto out;
	/*
	**	Check for no terminators or SCSI bus shorts to ground.
	**	Read SCSI data bus, data parity bits and control signals.
	**	We are expecting RESET to be TRUE and other signals to be 
	**	FALSE.
	*/

	term =	INB(nc_sstat0);
	term =	((term & 2) << 7) + ((term & 1) << 17);	/* rst sdp0 */
	term |= ((INB(nc_sstat2) & 0x01) << 26) |	/* sdp1     */
		((INW(nc_sbdl) & 0xff)   << 9)  |	/* d7-0     */
		((INW(nc_sbdl) & 0xff00) << 10) |	/* d15-8    */
		INB(nc_sbcl);	/* req ack bsy sel atn msg cd io    */

	if (!(np->features & FE_WIDE))
		term &= 0x3ffff;

	if (term != (2<<7)) {
		printk("%s: suspicious SCSI data while resetting the BUS.\n",
			ncr_name(np));
		printk("%s: %sdp0,d7-0,rst,req,ack,bsy,sel,atn,msg,c/d,i/o = "
			"0x%lx, expecting 0x%lx\n",
			ncr_name(np),
			(np->features & FE_WIDE) ? "dp1,d15-8," : "",
			(u_long)term, (u_long)(2<<7));
		if (driver_setup.bus_check == 1)
			retv = 1;
	}
out:
	OUTB (nc_scntl1, 0);
	return retv;
}

/*
 * Start reset process.
 * If reset in progress do nothing.
 * The interrupt handler will reinitialize the chip.
 * The timeout handler will wait for settle_time before 
 * clearing it and so resuming command processing.
 */
static void ncr_start_reset(struct ncb *np)
{
	if (!np->settle_time) {
		ncr_reset_scsi_bus(np, 1, driver_setup.settle_delay);
 	}
}
 
/*==========================================================
**
**
**	Reset the SCSI BUS.
**	This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_reset_bus (struct ncb *np, struct scsi_cmnd *cmd, int sync_reset)
{
/*	struct scsi_device        *device    = cmd->device; */
	struct ccb *cp;
	int found;

/*
 * Return immediately if reset is in progress.
 */
	if (np->settle_time) {
		return FAILED;
	}
/*
 * Start the reset process.
 * The script processor is then assumed to be stopped.
 * Commands will now be queued in the waiting list until a settle 
 * delay of 2 seconds will be completed.
 */
	ncr_start_reset(np);
/*
 * First, look in the wakeup list
 */
	for (found=0, cp=np->ccb; cp; cp=cp->link_ccb) {
		/*
		**	look for the ccb of this command.
		*/
		if (cp->host_status == HS_IDLE) continue;
		if (cp->cmd == cmd) {
			found = 1;
			break;
		}
	}
/*
 * Then, look in the waiting list
 */
	if (!found && retrieve_from_waiting_list(0, np, cmd))
		found = 1;
/*
 * Wake-up all awaiting commands with DID_RESET.
 */
	reset_waiting_list(np);
/*
 * Wake-up all pending commands with HS_RESET -> DID_RESET.
 */
	ncr_wakeup(np, HS_RESET);
/*
 * If the involved command was not in a driver queue, and the 
 * scsi driver told us reset is synchronous, and the command is not 
 * currently in the waiting list, complete it with DID_RESET status,
 * in order to keep it alive.
 */
	if (!found && sync_reset && !retrieve_from_waiting_list(0, np, cmd)) {
		cmd->result = ScsiResult(DID_RESET, 0);
		ncr_queue_done_cmd(np, cmd);
	}

	return SUCCESS;
}

#if 0 /* unused and broken.. */
/*==========================================================
**
**
**	Abort an SCSI command.
**	This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_abort_command (struct ncb *np, struct scsi_cmnd *cmd)
{
/*	struct scsi_device        *device    = cmd->device; */
	struct ccb *cp;
	int found;
	int retv;

/*
 * First, look for the scsi command in the waiting list
 */
	if (remove_from_waiting_list(np, cmd)) {
		cmd->result = ScsiResult(DID_ABORT, 0);
		ncr_queue_done_cmd(np, cmd);
		return SCSI_ABORT_SUCCESS;
	}

/*
 * Then, look in the wakeup list
 */
	for (found=0, cp=np->ccb; cp; cp=cp->link_ccb) {
		/*
		**	look for the ccb of this command.
		*/
		if (cp->host_status == HS_IDLE) continue;
		if (cp->cmd == cmd) {
			found = 1;
			break;
		}
	}

	if (!found) {
		return SCSI_ABORT_NOT_RUNNING;
	}

	if (np->settle_time) {
		return SCSI_ABORT_SNOOZE;
	}

	/*
	**	If the CCB is active, patch schedule jumps for the 
	**	script to abort the command.
	*/

	switch(cp->host_status) {
	case HS_BUSY:
	case HS_NEGOTIATE:
		printk ("%s: abort ccb=%p (cancel)\n", ncr_name (np), cp);
			cp->start.schedule.l_paddr =
				cpu_to_scr(NCB_SCRIPTH_PHYS (np, cancel));
		retv = SCSI_ABORT_PENDING;
		break;
	case HS_DISCONNECT:
		cp->restart.schedule.l_paddr =
				cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
		retv = SCSI_ABORT_PENDING;
		break;
	default:
		retv = SCSI_ABORT_NOT_RUNNING;
		break;

	}

	/*
	**      If there are no requests, the script
	**      processor will sleep on SEL_WAIT_RESEL.
	**      Let's wake it up, since it may have to work.
	*/
	OUTB (nc_istat, SIGP);

	return retv;
}
#endif

static void ncr_detach(struct ncb *np)
{
	struct ccb *cp;
	struct tcb *tp;
	struct lcb *lp;
	int target, lun;
	int i;
	char inst_name[16];

	/* Local copy so we don't access np after freeing it! */
	strlcpy(inst_name, ncr_name(np), sizeof(inst_name));

	printk("%s: releasing host resources\n", ncr_name(np));

/*
**	Stop the ncr_timeout process
**	Set release_stage to 1 and wait that ncr_timeout() set it to 2.
*/

#ifdef DEBUG_NCR53C8XX
	printk("%s: stopping the timer\n", ncr_name(np));
#endif
	np->release_stage = 1;
	for (i = 50 ; i && np->release_stage != 2 ; i--)
		mdelay(100);
	if (np->release_stage != 2)
		printk("%s: the timer seems to be already stopped\n", ncr_name(np));
	else np->release_stage = 2;

/*
**	Disable chip interrupts
*/

#ifdef DEBUG_NCR53C8XX
	printk("%s: disabling chip interrupts\n", ncr_name(np));
#endif
	OUTW (nc_sien , 0);
	OUTB (nc_dien , 0);

	/*
	**	Reset NCR chip
	**	Restore bios setting for automatic clock detection.
	*/

	printk("%s: resetting chip\n", ncr_name(np));
	ncr_chip_reset(np, 100);

	OUTB(nc_dmode,	np->sv_dmode);
	OUTB(nc_dcntl,	np->sv_dcntl);
	OUTB(nc_ctest0,	np->sv_ctest0);
	OUTB(nc_ctest3,	np->sv_ctest3);
	OUTB(nc_ctest4,	np->sv_ctest4);
	OUTB(nc_ctest5,	np->sv_ctest5);
	OUTB(nc_gpcntl,	np->sv_gpcntl);
	OUTB(nc_stest2,	np->sv_stest2);

	ncr_selectclock(np, np->sv_scntl3);

	/*
	**	Free allocated ccb(s)
	*/

	while ((cp=np->ccb->link_ccb) != NULL) {
		np->ccb->link_ccb = cp->link_ccb;
		if (cp->host_status) {
		printk("%s: shall free an active ccb (host_status=%d)\n",
			ncr_name(np), cp->host_status);
		}
#ifdef DEBUG_NCR53C8XX
	printk("%s: freeing ccb (%lx)\n", ncr_name(np), (u_long) cp);
#endif
		m_free_dma(cp, sizeof(*cp), "CCB");
	}

	/* Free allocated tp(s) */

	for (target = 0; target < MAX_TARGET ; target++) {
		tp=&np->target[target];
		for (lun = 0 ; lun < MAX_LUN ; lun++) {
			lp = tp->lp[lun];
			if (lp) {
#ifdef DEBUG_NCR53C8XX
	printk("%s: freeing lp (%lx)\n", ncr_name(np), (u_long) lp);
#endif
				if (lp->jump_ccb != &lp->jump_ccb_0)
					m_free_dma(lp->jump_ccb,256,"JUMP_CCB");
				m_free_dma(lp, sizeof(*lp), "LCB");
			}
		}
	}

	if (np->scripth0)
		m_free_dma(np->scripth0, sizeof(struct scripth), "SCRIPTH");
	if (np->script0)
		m_free_dma(np->script0, sizeof(struct script), "SCRIPT");
	if (np->ccb)
		m_free_dma(np->ccb, sizeof(struct ccb), "CCB");
	m_free_dma(np, sizeof(struct ncb), "NCB");

	printk("%s: host resources successfully released\n", inst_name);
}

/*==========================================================
**
**
**	Complete execution of a SCSI command.
**	Signal completion to the generic SCSI driver.
**
**
**==========================================================
*/

void ncr_complete (struct ncb *np, struct ccb *cp)
{
	struct scsi_cmnd *cmd;
	struct tcb *tp;
	struct lcb *lp;

	/*
	**	Sanity check
	*/

	if (!cp || cp->magic != CCB_MAGIC || !cp->cmd)
		return;

	/*
	**	Print minimal debug information.
	*/

	if (DEBUG_FLAGS & DEBUG_TINY)
		printk ("CCB=%lx STAT=%x/%x\n", (unsigned long)cp,
			cp->host_status,cp->scsi_status);

	/*
	**	Get command, target and lun pointers.
	*/

	cmd = cp->cmd;
	cp->cmd = NULL;
	tp = &np->target[cmd->device->id];
	lp = tp->lp[cmd->device->lun];

	/*
	**	We donnot queue more than 1 ccb per target 
	**	with negotiation at any time. If this ccb was 
	**	used for negotiation, clear this info in the tcb.
	*/

	if (cp == tp->nego_cp)
		tp->nego_cp = NULL;

	/*
	**	If auto-sense performed, change scsi status.
	*/
	if (cp->auto_sense) {
		cp->scsi_status = cp->auto_sense;
	}

	/*
	**	If we were recovering from queue full or performing 
	**	auto-sense, requeue skipped CCBs to the wait queue.
	*/

	if (lp && lp->held_ccb) {
		if (cp == lp->held_ccb) {
			list_splice_init(&lp->skip_ccbq, &lp->wait_ccbq);
			lp->held_ccb = NULL;
		}
	}

	/*
	**	Check for parity errors.
	*/

	if (cp->parity_status > 1) {
		PRINT_ADDR(cmd, "%d parity error(s).\n",cp->parity_status);
	}

	/*
	**	Check for extended errors.
	*/

	if (cp->xerr_status != XE_OK) {
		switch (cp->xerr_status) {
		case XE_EXTRA_DATA:
			PRINT_ADDR(cmd, "extraneous data discarded.\n");
			break;
		case XE_BAD_PHASE:
			PRINT_ADDR(cmd, "invalid scsi phase (4/5).\n");
			break;
		default:
			PRINT_ADDR(cmd, "extended error %d.\n",
					cp->xerr_status);
			break;
		}
		if (cp->host_status==HS_COMPLETE)
			cp->host_status = HS_FAIL;
	}

	/*
	**	Print out any error for debugging purpose.
	*/
	if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
		if (cp->host_status!=HS_COMPLETE || cp->scsi_status!=S_GOOD) {
			PRINT_ADDR(cmd, "ERROR: cmd=%x host_status=%x "
					"scsi_status=%x\n", cmd->cmnd[0],
					cp->host_status, cp->scsi_status);
		}
	}

	/*
	**	Check the status.
	*/
	if (   (cp->host_status == HS_COMPLETE)
		&& (cp->scsi_status == S_GOOD ||
		    cp->scsi_status == S_COND_MET)) {
		/*
		 *	All went well (GOOD status).
		 *	CONDITION MET status is returned on 
		 *	`Pre-Fetch' or `Search data' success.
		 */
		cmd->result = ScsiResult(DID_OK, cp->scsi_status);

		/*
		**	@RESID@
		**	Could dig out the correct value for resid,
		**	but it would be quite complicated.
		*/
		/* if (cp->phys.header.lastp != cp->phys.header.goalp) */

		/*
		**	Allocate the lcb if not yet.
		*/
		if (!lp)
			ncr_alloc_lcb (np, cmd->device->id, cmd->device->lun);

		tp->bytes     += cp->data_len;
		tp->transfers ++;

		/*
		**	If tags was reduced due to queue full,
		**	increase tags if 1000 good status received.
		*/
		if (lp && lp->usetags && lp->numtags < lp->maxtags) {
			++lp->num_good;
			if (lp->num_good >= 1000) {
				lp->num_good = 0;
				++lp->numtags;
				ncr_setup_tags (np, cmd->device);
			}
		}
	} else if ((cp->host_status == HS_COMPLETE)
		&& (cp->scsi_status == S_CHECK_COND)) {
		/*
		**   Check condition code
		*/
		cmd->result = ScsiResult(DID_OK, S_CHECK_COND);

		/*
		**	Copy back sense data to caller's buffer.
		*/
		memcpy(cmd->sense_buffer, cp->sense_buf,
		       min_t(size_t, SCSI_SENSE_BUFFERSIZE,
			     sizeof(cp->sense_buf)));

		if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
			u_char *p = cmd->sense_buffer;
			int i;
			PRINT_ADDR(cmd, "sense data:");
			for (i=0; i<14; i++) printk (" %x", *p++);
			printk (".\n");
		}
	} else if ((cp->host_status == HS_COMPLETE)
		&& (cp->scsi_status == S_CONFLICT)) {
		/*
		**   Reservation Conflict condition code
		*/
		cmd->result = ScsiResult(DID_OK, S_CONFLICT);
	
	} else if ((cp->host_status == HS_COMPLETE)
		&& (cp->scsi_status == S_BUSY ||
		    cp->scsi_status == S_QUEUE_FULL)) {

		/*
		**   Target is busy.
		*/
		cmd->result = ScsiResult(DID_OK, cp->scsi_status);

	} else if ((cp->host_status == HS_SEL_TIMEOUT)
		|| (cp->host_status == HS_TIMEOUT)) {

		/*
		**   No response
		*/
		cmd->result = ScsiResult(DID_TIME_OUT, cp->scsi_status);

	} else if (cp->host_status == HS_RESET) {

		/*
		**   SCSI bus reset
		*/
		cmd->result = ScsiResult(DID_RESET, cp->scsi_status);

	} else if (cp->host_status == HS_ABORTED) {

		/*
		**   Transfer aborted
		*/
		cmd->result = ScsiResult(DID_ABORT, cp->scsi_status);

	} else {

		/*
		**  Other protocol messes
		*/
		PRINT_ADDR(cmd, "COMMAND FAILED (%x %x) @%p.\n",
			cp->host_status, cp->scsi_status, cp);

		cmd->result = ScsiResult(DID_ERROR, cp->scsi_status);
	}

	/*
	**	trace output
	*/

	if (tp->usrflag & UF_TRACE) {
		u_char * p;
		int i;
		PRINT_ADDR(cmd, " CMD:");
		p = (u_char*) &cmd->cmnd[0];
		for (i=0; i<cmd->cmd_len; i++) printk (" %x", *p++);

		if (cp->host_status==HS_COMPLETE) {
			switch (cp->scsi_status) {
			case S_GOOD:
				printk ("  GOOD");
				break;
			case S_CHECK_COND:
				printk ("  SENSE:");
				p = (u_char*) &cmd->sense_buffer;
				for (i=0; i<14; i++)
					printk (" %x", *p++);
				break;
			default:
				printk ("  STAT: %x\n", cp->scsi_status);
				break;
			}
		} else printk ("  HOSTERROR: %x", cp->host_status);
		printk ("\n");
	}

	/*
	**	Free this ccb
	*/
	ncr_free_ccb (np, cp);

	/*
	**	requeue awaiting scsi commands for this lun.
	*/
	if (lp && lp->queuedccbs < lp->queuedepth &&
	    !list_empty(&lp->wait_ccbq))
		ncr_start_next_ccb(np, lp, 2);

	/*
	**	requeue awaiting scsi commands for this controller.
	*/
	if (np->waiting_list)
		requeue_waiting_list(np);

	/*
	**	signal completion to generic driver.
	*/
	ncr_queue_done_cmd(np, cmd);
}

/*==========================================================
**
**
**	Signal all (or one) control block done.
**
**
**==========================================================
*/

/*
**	This CCB has been skipped by the NCR.
**	Queue it in the corresponding unit queue.
*/
static void ncr_ccb_skipped(struct ncb *np, struct ccb *cp)
{
	struct tcb *tp = &np->target[cp->target];
	struct lcb *lp = tp->lp[cp->lun];

	if (lp && cp != np->ccb) {
		cp->host_status &= ~HS_SKIPMASK;
		cp->start.schedule.l_paddr = 
			cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
		list_move_tail(&cp->link_ccbq, &lp->skip_ccbq);
		if (cp->queued) {
			--lp->queuedccbs;
		}
	}
	if (cp->queued) {
		--np->queuedccbs;
		cp->queued = 0;
	}
}

/*
**	The NCR has completed CCBs.
**	Look at the DONE QUEUE if enabled, otherwise scan all CCBs
*/
void ncr_wakeup_done (struct ncb *np)
{
	struct ccb *cp;
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
	int i, j;

	i = np->ccb_done_ic;
	while (1) {
		j = i+1;
		if (j >= MAX_DONE)
			j = 0;

		cp = np->ccb_done[j];
		if (!CCB_DONE_VALID(cp))
			break;

		np->ccb_done[j] = (struct ccb *)CCB_DONE_EMPTY;
		np->scripth->done_queue[5*j + 4] =
				cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));
		MEMORY_BARRIER();
		np->scripth->done_queue[5*i + 4] =
				cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));

		if (cp->host_status & HS_DONEMASK)
			ncr_complete (np, cp);
		else if (cp->host_status & HS_SKIPMASK)
			ncr_ccb_skipped (np, cp);

		i = j;
	}
	np->ccb_done_ic = i;
#else
	cp = np->ccb;
	while (cp) {
		if (cp->host_status & HS_DONEMASK)
			ncr_complete (np, cp);
		else if (cp->host_status & HS_SKIPMASK)
			ncr_ccb_skipped (np, cp);
		cp = cp->link_ccb;
	}
#endif
}

/*
**	Complete all active CCBs.
*/
void ncr_wakeup (struct ncb *np, u_long code)
{
	struct ccb *cp = np->ccb;

	while (cp) {
		if (cp->host_status != HS_IDLE) {
			cp->host_status = code;
			ncr_complete (np, cp);
		}
		cp = cp->link_ccb;
	}
}

/*
** Reset ncr chip.
*/

/* Some initialisation must be done immediately following reset, for 53c720,
 * at least.  EA (dcntl bit 5) isn't set here as it is set once only in
 * the _detect function.
 */
static void ncr_chip_reset(struct ncb *np, int delay)
{
	OUTB (nc_istat,  SRST);
	udelay(delay);
	OUTB (nc_istat,  0   );

	if (np->features & FE_EHP)
		OUTB (nc_ctest0, EHP);
	if (np->features & FE_MUX)
		OUTB (nc_ctest4, MUX);
}


/*==========================================================
**
**
**	Start NCR chip.
**
**
**==========================================================
*/

void ncr_init (struct ncb *np, int reset, char * msg, u_long code)
{
 	int	i;

 	/*
	**	Reset chip if asked, otherwise just clear fifos.
 	*/

	if (reset) {
		OUTB (nc_istat,  SRST);
		udelay(100);
	}
	else {
		OUTB (nc_stest3, TE|CSF);
		OUTONB (nc_ctest3, CLF);
	}
 
	/*
	**	Message.
	*/

	if (msg) printk (KERN_INFO "%s: restart (%s).\n", ncr_name (np), msg);

	/*
	**	Clear Start Queue
	*/
	np->queuedepth = MAX_START - 1;	/* 1 entry needed as end marker */
	for (i = 1; i < MAX_START + MAX_START; i += 2)
		np->scripth0->tryloop[i] =
				cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));

	/*
	**	Start at first entry.
	*/
	np->squeueput = 0;
	np->script0->startpos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np, tryloop));

#ifdef SCSI_NCR_CCB_DONE_SUPPORT
	/*
	**	Clear Done Queue
	*/
	for (i = 0; i < MAX_DONE; i++) {
		np->ccb_done[i] = (struct ccb *)CCB_DONE_EMPTY;
		np->scripth0->done_queue[5*i + 4] =
			cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));
	}
#endif

	/*
	**	Start at first entry.
	*/
	np->script0->done_pos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np,done_queue));
	np->ccb_done_ic = MAX_DONE-1;
	np->scripth0->done_queue[5*(MAX_DONE-1) + 4] =
			cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));

	/*
	**	Wakeup all pending jobs.
	*/
	ncr_wakeup (np, code);

	/*
	**	Init chip.
	*/

	/*
	** Remove reset; big delay because the 895 needs time for the
	** bus mode to settle
	*/
	ncr_chip_reset(np, 2000);

	OUTB (nc_scntl0, np->rv_scntl0 | 0xc0);
					/*  full arb., ena parity, par->ATN  */
	OUTB (nc_scntl1, 0x00);		/*  odd parity, and remove CRST!! */

	ncr_selectclock(np, np->rv_scntl3);	/* Select SCSI clock */

	OUTB (nc_scid  , RRE|np->myaddr);	/* Adapter SCSI address */
	OUTW (nc_respid, 1ul<<np->myaddr);	/* Id to respond to */
	OUTB (nc_istat , SIGP	);		/*  Signal Process */
	OUTB (nc_dmode , np->rv_dmode);		/* Burst length, dma mode */
	OUTB (nc_ctest5, np->rv_ctest5);	/* Large fifo + large burst */

	OUTB (nc_dcntl , NOCOM|np->rv_dcntl);	/* Protect SFBR */
	OUTB (nc_ctest0, np->rv_ctest0);	/* 720: CDIS and EHP */
	OUTB (nc_ctest3, np->rv_ctest3);	/* Write and invalidate */
	OUTB (nc_ctest4, np->rv_ctest4);	/* Master parity checking */

	OUTB (nc_stest2, EXT|np->rv_stest2);	/* Extended Sreq/Sack filtering */
	OUTB (nc_stest3, TE);			/* TolerANT enable */
	OUTB (nc_stime0, 0x0c	);		/* HTH disabled  STO 0.25 sec */

	/*
	**	Disable disconnects.
	*/

	np->disc = 0;

	/*
	**    Enable GPIO0 pin for writing if LED support.
	*/

	if (np->features & FE_LED0) {
		OUTOFFB (nc_gpcntl, 0x01);
	}

	/*
	**      enable ints
	*/

	OUTW (nc_sien , STO|HTH|MA|SGE|UDC|RST|PAR);
	OUTB (nc_dien , MDPE|BF|ABRT|SSI|SIR|IID);

	/*
	**	Fill in target structure.
	**	Reinitialize usrsync.
	**	Reinitialize usrwide.
	**	Prepare sync negotiation according to actual SCSI bus mode.
	*/

	for (i=0;i<MAX_TARGET;i++) {
		struct tcb *tp = &np->target[i];

		tp->sval    = 0;
		tp->wval    = np->rv_scntl3;

		if (tp->usrsync != 255) {
			if (tp->usrsync <= np->maxsync) {
				if (tp->usrsync < np->minsync) {
					tp->usrsync = np->minsync;
				}
			}
			else
				tp->usrsync = 255;
		}

		if (tp->usrwide > np->maxwide)
			tp->usrwide = np->maxwide;

	}

	/*
	**    Start script processor.
	*/
	if (np->paddr2) {
		if (bootverbose)
			printk ("%s: Downloading SCSI SCRIPTS.\n",
				ncr_name(np));
		OUTL (nc_scratcha, vtobus(np->script0));
		OUTL_DSP (NCB_SCRIPTH_PHYS (np, start_ram));
	}
	else
		OUTL_DSP (NCB_SCRIPT_PHYS (np, start));
}

/*==========================================================
**
**	Prepare the negotiation values for wide and
**	synchronous transfers.
**
**==========================================================
*/

static void ncr_negotiate (struct ncb* np, struct tcb* tp)
{
	/*
	**	minsync unit is 4ns !
	*/

	u_long minsync = tp->usrsync;

	/*
	**	SCSI bus mode limit
	*/

	if (np->scsi_mode && np->scsi_mode == SMODE_SE) {
		if (minsync < 12) minsync = 12;
	}

	/*
	**	our limit ..
	*/

	if (minsync < np->minsync)
		minsync = np->minsync;

	/*
	**	divider limit
	*/

	if (minsync > np->maxsync)
		minsync = 255;

	if (tp->maxoffs > np->maxoffs)
		tp->maxoffs = np->maxoffs;

	tp->minsync = minsync;
	tp->maxoffs = (minsync<255 ? tp->maxoffs : 0);

	/*
	**	period=0: has to negotiate sync transfer
	*/

	tp->period=0;

	/*
	**	widedone=0: has to negotiate wide transfer
	*/
	tp->widedone=0;
}

/*==========================================================
**
**	Get clock factor and sync divisor for a given 
**	synchronous factor period.
**	Returns the clock factor (in sxfer) and scntl3 
**	synchronous divisor field.
**
**==========================================================
*/

static void ncr_getsync(struct ncb *np, u_char sfac, u_char *fakp, u_char *scntl3p)
{
	u_long	clk = np->clock_khz;	/* SCSI clock frequency in kHz	*/
	int	div = np->clock_divn;	/* Number of divisors supported	*/
	u_long	fak;			/* Sync factor in sxfer		*/
	u_long	per;			/* Period in tenths of ns	*/
	u_long	kpc;			/* (per * clk)			*/

	/*
	**	Compute the synchronous period in tenths of nano-seconds
	*/
	if	(sfac <= 10)	per = 250;
	else if	(sfac == 11)	per = 303;
	else if	(sfac == 12)	per = 500;
	else			per = 40 * sfac;

	/*
	**	Look for the greatest clock divisor that allows an 
	**	input speed faster than the period.
	*/
	kpc = per * clk;
	while (--div > 0)
		if (kpc >= (div_10M[div] << 2)) break;

	/*
	**	Calculate the lowest clock factor that allows an output 
	**	speed not faster than the period.
	*/
	fak = (kpc - 1) / div_10M[div] + 1;

#if 0	/* This optimization does not seem very useful */

	per = (fak * div_10M[div]) / clk;

	/*
	**	Why not to try the immediate lower divisor and to choose 
	**	the one that allows the fastest output speed ?
	**	We don't want input speed too much greater than output speed.
	*/
	if (div >= 1 && fak < 8) {
		u_long fak2, per2;
		fak2 = (kpc - 1) / div_10M[div-1] + 1;
		per2 = (fak2 * div_10M[div-1]) / clk;
		if (per2 < per && fak2 <= 8) {
			fak = fak2;
			per = per2;
			--div;
		}
	}
#endif

	if (fak < 4) fak = 4;	/* Should never happen, too bad ... */

	/*
	**	Compute and return sync parameters for the ncr
	*/
	*fakp		= fak - 4;
	*scntl3p	= ((div+1) << 4) + (sfac < 25 ? 0x80 : 0);
}


/*==========================================================
**
**	Set actual values, sync status and patch all ccbs of 
**	a target according to new sync/wide agreement.
**
**==========================================================
*/

static void ncr_set_sync_wide_status (struct ncb *np, u_char target)
{
	struct ccb *cp;
	struct tcb *tp = &np->target[target];

	/*
	**	set actual value and sync_status
	*/
	OUTB (nc_sxfer, tp->sval);
	np->sync_st = tp->sval;
	OUTB (nc_scntl3, tp->wval);
	np->wide_st = tp->wval;

	/*
	**	patch ALL ccbs of this target.
	*/
	for (cp = np->ccb; cp; cp = cp->link_ccb) {
		if (!cp->cmd) continue;
		if (scmd_id(cp->cmd) != target) continue;
#if 0
		cp->sync_status = tp->sval;
		cp->wide_status = tp->wval;
#endif
		cp->phys.select.sel_scntl3 = tp->wval;
		cp->phys.select.sel_sxfer  = tp->sval;
	}
}

/*==========================================================
**
**	Switch sync mode for current job and it's target
**
**==========================================================
*/

static void ncr_setsync (struct ncb *np, struct ccb *cp, u_char scntl3, u_char sxfer)
{
	struct scsi_cmnd *cmd = cp->cmd;
	struct tcb *tp;
	u_char target = INB (nc_sdid) & 0x0f;
	u_char idiv;

	BUG_ON(target != (scmd_id(cmd) & 0xf));

	tp = &np->target[target];

	if (!scntl3 || !(sxfer & 0x1f))
		scntl3 = np->rv_scntl3;
	scntl3 = (scntl3 & 0xf0) | (tp->wval & EWS) | (np->rv_scntl3 & 0x07);

	/*
	**	Deduce the value of controller sync period from scntl3.
	**	period is in tenths of nano-seconds.
	*/

	idiv = ((scntl3 >> 4) & 0x7);
	if ((sxfer & 0x1f) && idiv)
		tp->period = (((sxfer>>5)+4)*div_10M[idiv-1])/np->clock_khz;
	else
		tp->period = 0xffff;

	/* Stop there if sync parameters are unchanged */
	if (tp->sval == sxfer && tp->wval == scntl3)
		return;
	tp->sval = sxfer;
	tp->wval = scntl3;

	if (sxfer & 0x01f) {
		/* Disable extended Sreq/Sack filtering */
		if (tp->period <= 2000)
			OUTOFFB(nc_stest2, EXT);
	}
 
	spi_display_xfer_agreement(tp->starget);

	/*
	**	set actual value and sync_status
	**	patch ALL ccbs of this target.
	*/
	ncr_set_sync_wide_status(np, target);
}

/*==========================================================
**
**	Switch wide mode for current job and it's target
**	SCSI specs say: a SCSI device that accepts a WDTR 
**	message shall reset the synchronous agreement to 
**	asynchronous mode.
**
**==========================================================
*/

static void ncr_setwide (struct ncb *np, struct ccb *cp, u_char wide, u_char ack)
{
	struct scsi_cmnd *cmd = cp->cmd;
	u16 target = INB (nc_sdid) & 0x0f;
	struct tcb *tp;
	u_char	scntl3;
	u_char	sxfer;

	BUG_ON(target != (scmd_id(cmd) & 0xf));

	tp = &np->target[target];
	tp->widedone  =  wide+1;
	scntl3 = (tp->wval & (~EWS)) | (wide ? EWS : 0);

	sxfer = ack ? 0 : tp->sval;

	/*
	**	 Stop there if sync/wide parameters are unchanged
	*/
	if (tp->sval == sxfer && tp->wval == scntl3) return;
	tp->sval = sxfer;
	tp->wval = scntl3;

	/*
	**	Bells and whistles   ;-)
	*/
	if (bootverbose >= 2) {
		dev_info(&cmd->device->sdev_target->dev, "WIDE SCSI %sabled.\n",
				(scntl3 & EWS) ? "en" : "dis");
	}

	/*
	**	set actual value and sync_status
	**	patch ALL ccbs of this target.
	*/
	ncr_set_sync_wide_status(np, target);
}

/*==========================================================
**
**	Switch tagged mode for a target.
**
**==========================================================
*/

static void ncr_setup_tags (struct ncb *np, struct scsi_device *sdev)
{
	unsigned char tn = sdev->id, ln = sdev->lun;
	struct tcb *tp = &np->target[tn];
	struct lcb *lp = tp->lp[ln];
	u_char   reqtags, maxdepth;

	/*
	**	Just in case ...
	*/
	if ((!tp) || (!lp) || !sdev)
		return;

	/*
	**	If SCSI device queue depth is not yet set, leave here.
	*/
	if (!lp->scdev_depth)
		return;

	/*
	**	Donnot allow more tags than the SCSI driver can queue 
	**	for this device.
	**	Donnot allow more tags than we can handle.
	*/
	maxdepth = lp->scdev_depth;
	if (maxdepth > lp->maxnxs)	maxdepth    = lp->maxnxs;
	if (lp->maxtags > maxdepth)	lp->maxtags = maxdepth;
	if (lp->numtags > maxdepth)	lp->numtags = maxdepth;

	/*
	**	only devices conformant to ANSI Version >= 2
	**	only devices capable of tagged commands
	**	only if enabled by user ..
	*/
	if (sdev->tagged_supported && lp->numtags > 1) {
		reqtags = lp->numtags;
	} else {
		reqtags = 1;
	}

	/*
	**	Update max number of tags
	*/
	lp->numtags = reqtags;
	if (lp->numtags > lp->maxtags)
		lp->maxtags = lp->numtags;

	/*
	**	If we want to switch tag mode, we must wait 
	**	for no CCB to be active.
	*/
	if	(reqtags > 1 && lp->usetags) {	 /* Stay in tagged mode    */
		if (lp->queuedepth == reqtags)	 /* Already announced	   */
			return;
		lp->queuedepth	= reqtags;
	}
	else if	(reqtags <= 1 && !lp->usetags) { /* Stay in untagged mode  */
		lp->queuedepth	= reqtags;
		return;
	}
	else {					 /* Want to switch tag mode */
		if (lp->busyccbs)		 /* If not yet safe, return */
			return;
		lp->queuedepth	= reqtags;
		lp->usetags	= reqtags > 1 ? 1 : 0;
	}

	/*
	**	Patch the lun mini-script, according to tag mode.
	*/
	lp->jump_tag.l_paddr = lp->usetags?
			cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_tag)) :
			cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_notag));

	/*
	**	Announce change to user.
	*/
	if (bootverbose) {
		if (lp->usetags) {
			dev_info(&sdev->sdev_gendev,
				"tagged command queue depth set to %d\n",
				reqtags);
		} else {
			dev_info(&sdev->sdev_gendev,
					"tagged command queueing disabled\n");
		}
	}
}

/*==========================================================
**
**
**	ncr timeout handler.
**
**
**==========================================================
**
**	Misused to keep the driver running when
**	interrupts are not configured correctly.
**
**----------------------------------------------------------
*/

static void ncr_timeout (struct ncb *np)
{
	u_long	thistime = jiffies;

	/*
	**	If release process in progress, let's go
	**	Set the release stage from 1 to 2 to synchronize
	**	with the release process.
	*/

	if (np->release_stage) {
		if (np->release_stage == 1) np->release_stage = 2;
		return;
	}

	np->timer.expires = jiffies + SCSI_NCR_TIMER_INTERVAL;
	add_timer(&np->timer);

	/*
	**	If we are resetting the ncr, wait for settle_time before 
	**	clearing it. Then command processing will be resumed.
	*/
	if (np->settle_time) {
		if (np->settle_time <= thistime) {
			if (bootverbose > 1)
				printk("%s: command processing resumed\n", ncr_name(np));
			np->settle_time	= 0;
			np->disc	= 1;
			requeue_waiting_list(np);
		}
		return;
	}

	/*
	**	Since the generic scsi driver only allows us 0.5 second 
	**	to perform abort of a command, we must look at ccbs about 
	**	every 0.25 second.
	*/
	if (np->lasttime + 4*HZ < thistime) {
		/*
		**	block ncr interrupts
		*/
		np->lasttime = thistime;
	}

#ifdef SCSI_NCR_BROKEN_INTR
	if (INB(nc_istat) & (INTF|SIP|DIP)) {

		/*
		**	Process pending interrupts.
		*/
		if (DEBUG_FLAGS & DEBUG_TINY) printk ("{");
		ncr_exception (np);
		if (DEBUG_FLAGS & DEBUG_TINY) printk ("}");
	}
#endif /* SCSI_NCR_BROKEN_INTR */
}

/*==========================================================
**
**	log message for real hard errors
**
**	"ncr0 targ 0?: ERROR (ds:si) (so-si-sd) (sxfer/scntl3) @ name (dsp:dbc)."
**	"	      reg: r0 r1 r2 r3 r4 r5 r6 ..... rf."
**
**	exception register:
**		ds:	dstat
**		si:	sist
**
**	SCSI bus lines:
**		so:	control lines as driver by NCR.
**		si:	control lines as seen by NCR.
**		sd:	scsi data lines as seen by NCR.
**
**	wide/fastmode:
**		sxfer:	(see the manual)
**		scntl3:	(see the manual)
**
**	current script command:
**		dsp:	script address (relative to start of script).
**		dbc:	first word of script command.
**
**	First 16 register of the chip:
**		r0..rf
**
**==========================================================
*/

static void ncr_log_hard_error(struct ncb *np, u16 sist, u_char dstat)
{
	u32	dsp;
	int	script_ofs;
	int	script_size;
	char	*script_name;
	u_char	*script_base;
	int	i;

	dsp	= INL (nc_dsp);

	if (dsp > np->p_script && dsp <= np->p_script + sizeof(struct script)) {
		script_ofs	= dsp - np->p_script;
		script_size	= sizeof(struct script);
		script_base	= (u_char *) np->script0;
		script_name	= "script";
	}
	else if (np->p_scripth < dsp && 
		 dsp <= np->p_scripth + sizeof(struct scripth)) {
		script_ofs	= dsp - np->p_scripth;
		script_size	= sizeof(struct scripth);
		script_base	= (u_char *) np->scripth0;
		script_name	= "scripth";
	} else {
		script_ofs	= dsp;
		script_size	= 0;
		script_base	= NULL;
		script_name	= "mem";
	}

	printk ("%s:%d: ERROR (%x:%x) (%x-%x-%x) (%x/%x) @ (%s %x:%08x).\n",
		ncr_name (np), (unsigned)INB (nc_sdid)&0x0f, dstat, sist,
		(unsigned)INB (nc_socl), (unsigned)INB (nc_sbcl), (unsigned)INB (nc_sbdl),
		(unsigned)INB (nc_sxfer),(unsigned)INB (nc_scntl3), script_name, script_ofs,
		(unsigned)INL (nc_dbc));

	if (((script_ofs & 3) == 0) &&
	    (unsigned)script_ofs < script_size) {
		printk ("%s: script cmd = %08x\n", ncr_name(np),
			scr_to_cpu((int) *(ncrcmd *)(script_base + script_ofs)));
	}

	printk ("%s: regdump:", ncr_name(np));
	for (i=0; i<16;i++)
            printk (" %02x", (unsigned)INB_OFF(i));
	printk (".\n");
}

/*============================================================
**
**	ncr chip exception handler.
**
**============================================================
**
**	In normal cases, interrupt conditions occur one at a 
**	time. The ncr is able to stack in some extra registers 
**	other interrupts that will occur after the first one.
**	But, several interrupts may occur at the same time.
**
**	We probably should only try to deal with the normal 
**	case, but it seems that multiple interrupts occur in 
**	some cases that are not abnormal at all.
**
**	The most frequent interrupt condition is Phase Mismatch.
**	We should want to service this interrupt quickly.
**	A SCSI parity error may be delivered at the same time.
**	The SIR interrupt is not very frequent in this driver, 
**	since the INTFLY is likely used for command completion 
**	signaling.
**	The Selection Timeout interrupt may be triggered with 
**	IID and/or UDC.
**	The SBMC interrupt (SCSI Bus Mode Change) may probably 
**	occur at any time.
**
**	This handler try to deal as cleverly as possible with all
**	the above.
**
**============================================================
*/

void ncr_exception (struct ncb *np)
{
	u_char	istat, dstat;
	u16	sist;
	int	i;

	/*
	**	interrupt on the fly ?
	**	Since the global header may be copied back to a CCB 
	**	using a posted PCI memory write, the last operation on 
	**	the istat register is a READ in order to flush posted 
	**	PCI write commands.
	*/
	istat = INB (nc_istat);
	if (istat & INTF) {
		OUTB (nc_istat, (istat & SIGP) | INTF);
		istat = INB (nc_istat);
		if (DEBUG_FLAGS & DEBUG_TINY) printk ("F ");
		ncr_wakeup_done (np);
	}

	if (!(istat & (SIP|DIP)))
		return;

	if (istat & CABRT)
		OUTB (nc_istat, CABRT);

	/*
	**	Steinbach's Guideline for Systems Programming:
	**	Never test for an error condition you don't know how to handle.
	*/

	sist  = (istat & SIP) ? INW (nc_sist)  : 0;
	dstat = (istat & DIP) ? INB (nc_dstat) : 0;

	if (DEBUG_FLAGS & DEBUG_TINY)
		printk ("<%d|%x:%x|%x:%x>",
			(int)INB(nc_scr0),
			dstat,sist,
			(unsigned)INL(nc_dsp),
			(unsigned)INL(nc_dbc));

	/*========================================================
	**	First, interrupts we want to service cleanly.
	**
	**	Phase mismatch is the most frequent interrupt, and 
	**	so we have to service it as quickly and as cleanly 
	**	as possible.
	**	Programmed interrupts are rarely used in this driver,
	**	but we must handle them cleanly anyway.
	**	We try to deal with PAR and SBMC combined with 
	**	some other interrupt(s).
	**=========================================================
	*/

	if (!(sist  & (STO|GEN|HTH|SGE|UDC|RST)) &&
	    !(dstat & (MDPE|BF|ABRT|IID))) {
		if ((sist & SBMC) && ncr_int_sbmc (np))
			return;
		if ((sist & PAR)  && ncr_int_par  (np))
			return;
		if (sist & MA) {
			ncr_int_ma (np);
			return;
		}
		if (dstat & SIR) {
			ncr_int_sir (np);
			return;
		}
		/*
		**  DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 2.
		*/
		if (!(sist & (SBMC|PAR)) && !(dstat & SSI)) {
			printk(	"%s: unknown interrupt(s) ignored, "
				"ISTAT=%x DSTAT=%x SIST=%x\n",
				ncr_name(np), istat, dstat, sist);
			return;
		}
		OUTONB_STD ();
		return;
	}

	/*========================================================
	**	Now, interrupts that need some fixing up.
	**	Order and multiple interrupts is so less important.
	**
	**	If SRST has been asserted, we just reset the chip.
	**
	**	Selection is intirely handled by the chip. If the 
	**	chip says STO, we trust it. Seems some other 
	**	interrupts may occur at the same time (UDC, IID), so 
	**	we ignore them. In any case we do enough fix-up 
	**	in the service routine.
	**	We just exclude some fatal dma errors.
	**=========================================================
	*/

	if (sist & RST) {
		ncr_init (np, 1, bootverbose ? "scsi reset" : NULL, HS_RESET);
		return;
	}

	if ((sist & STO) &&
		!(dstat & (MDPE|BF|ABRT))) {
	/*
	**	DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 1.
	*/
		OUTONB (nc_ctest3, CLF);

		ncr_int_sto (np);
		return;
	}

	/*=========================================================
	**	Now, interrupts we are not able to recover cleanly.
	**	(At least for the moment).
	**
	**	Do the register dump.
	**	Log message for real hard errors.
	**	Clear all fifos.
	**	For MDPE, BF, ABORT, IID, SGE and HTH we reset the 
	**	BUS and the chip.
	**	We are more soft for UDC.
	**=========================================================
	*/

	if (time_after(jiffies, np->regtime)) {
		np->regtime = jiffies + 10*HZ;
		for (i = 0; i<sizeof(np->regdump); i++)
			((char*)&np->regdump)[i] = INB_OFF(i);
		np->regdump.nc_dstat = dstat;
		np->regdump.nc_sist  = sist;
	}

	ncr_log_hard_error(np, sist, dstat);

	printk ("%s: have to clear fifos.\n", ncr_name (np));
	OUTB (nc_stest3, TE|CSF);
	OUTONB (nc_ctest3, CLF);

	if ((sist & (SGE)) ||
		(dstat & (MDPE|BF|ABRT|IID))) {
		ncr_start_reset(np);
		return;
	}

	if (sist & HTH) {
		printk ("%s: handshake timeout\n", ncr_name(np));
		ncr_start_reset(np);
		return;
	}

	if (sist & UDC) {
		printk ("%s: unexpected disconnect\n", ncr_name(np));
		OUTB (HS_PRT, HS_UNEXPECTED);
		OUTL_DSP (NCB_SCRIPT_PHYS (np, cleanup));
		return;
	}

	/*=========================================================
	**	We just miss the cause of the interrupt. :(
	**	Print a message. The timeout will do the real work.
	**=========================================================
	*/
	printk ("%s: unknown interrupt\n", ncr_name(np));
}

/*==========================================================
**
**	ncr chip exception handler for selection timeout
**
**==========================================================
**
**	There seems to be a bug in the 53c810.
**	Although a STO-Interrupt is pending,
**	it continues executing script commands.
**	But it will fail and interrupt (IID) on
**	the next instruction where it's looking
**	for a valid phase.
**
**----------------------------------------------------------
*/

void ncr_int_sto (struct ncb *np)
{
	u_long dsa;
	struct ccb *cp;
	if (DEBUG_FLAGS & DEBUG_TINY) printk ("T");

	/*
	**	look for ccb and set the status.
	*/

	dsa = INL (nc_dsa);
	cp = np->ccb;
	while (cp && (CCB_PHYS (cp, phys) != dsa))
		cp = cp->link_ccb;

	if (cp) {
		cp-> host_status = HS_SEL_TIMEOUT;
		ncr_complete (np, cp);
	}

	/*
	**	repair start queue and jump to start point.
	*/

	OUTL_DSP (NCB_SCRIPTH_PHYS (np, sto_restart));
	return;
}

/*==========================================================
**
**	ncr chip exception handler for SCSI bus mode change
**
**==========================================================
**
**	spi2-r12 11.2.3 says a transceiver mode change must 
**	generate a reset event and a device that detects a reset 
**	event shall initiate a hard reset. It says also that a
**	device that detects a mode change shall set data transfer 
**	mode to eight bit asynchronous, etc...
**	So, just resetting should be enough.
**	 
**
**----------------------------------------------------------
*/

static int ncr_int_sbmc (struct ncb *np)
{
	u_char scsi_mode = INB (nc_stest4) & SMODE;

	if (scsi_mode != np->scsi_mode) {
		printk("%s: SCSI bus mode change from %x to %x.\n",
			ncr_name(np), np->scsi_mode, scsi_mode);

		np->scsi_mode = scsi_mode;


		/*
		**	Suspend command processing for 1 second and 
		**	reinitialize all except the chip.
		*/
		np->settle_time	= jiffies + HZ;
		ncr_init (np, 0, bootverbose ? "scsi mode change" : NULL, HS_RESET);
		return 1;
	}
	return 0;
}

/*==========================================================
**
**	ncr chip exception handler for SCSI parity error.
**
**==========================================================
**
**
**----------------------------------------------------------
*/

static int ncr_int_par (struct ncb *np)
{
	u_char	hsts	= INB (HS_PRT);
	u32	dbc	= INL (nc_dbc);
	u_char	sstat1	= INB (nc_sstat1);
	int phase	= -1;
	int msg		= -1;
	u32 jmp;

	printk("%s: SCSI parity error detected: SCR1=%d DBC=%x SSTAT1=%x\n",
		ncr_name(np), hsts, dbc, sstat1);

	/*
	 *	Ignore the interrupt if the NCR is not connected 
	 *	to the SCSI bus, since the right work should have  
	 *	been done on unexpected disconnection handling.
	 */
	if (!(INB (nc_scntl1) & ISCON))
		return 0;

	/*
	 *	If the nexus is not clearly identified, reset the bus.
	 *	We will try to do better later.
	 */
	if (hsts & HS_INVALMASK)
		goto reset_all;

	/*
	 *	If the SCSI parity error occurs in MSG IN phase, prepare a 
	 *	MSG PARITY message. Otherwise, prepare a INITIATOR DETECTED 
	 *	ERROR message and let the device decide to retry the command 
	 *	or to terminate with check condition. If we were in MSG IN 
	 *	phase waiting for the response of a negotiation, we will 
	 *	get SIR_NEGO_FAILED at dispatch.
	 */
	if (!(dbc & 0xc0000000))
		phase = (dbc >> 24) & 7;
	if (phase == 7)
		msg = MSG_PARITY_ERROR;
	else
		msg = INITIATOR_ERROR;


	/*
	 *	If the NCR stopped on a MOVE ^ DATA_IN, we jump to a 
	 *	script that will ignore all data in bytes until phase 
	 *	change, since we are not sure the chip will wait the phase 
	 *	change prior to delivering the interrupt.
	 */
	if (phase == 1)
		jmp = NCB_SCRIPTH_PHYS (np, par_err_data_in);
	else
		jmp = NCB_SCRIPTH_PHYS (np, par_err_other);

	OUTONB (nc_ctest3, CLF );	/* clear dma fifo  */
	OUTB (nc_stest3, TE|CSF);	/* clear scsi fifo */

	np->msgout[0] = msg;
	OUTL_DSP (jmp);
	return 1;

reset_all:
	ncr_start_reset(np);
	return 1;
}

/*==========================================================
**
**
**	ncr chip exception handler for phase errors.
**
**
**==========================================================
**
**	We have to construct a new transfer descriptor,
**	to transfer the rest of the current block.
**
**----------------------------------------------------------
*/

static void ncr_int_ma (struct ncb *np)
{
	u32	dbc;
	u32	rest;
	u32	dsp;
	u32	dsa;
	u32	nxtdsp;
	u32	newtmp;
	u32	*vdsp;
	u32	oadr, olen;
	u32	*tblp;
	ncrcmd *newcmd;
	u_char	cmd, sbcl;
	struct ccb *cp;

	dsp	= INL (nc_dsp);
	dbc	= INL (nc_dbc);
	sbcl	= INB (nc_sbcl);

	cmd	= dbc >> 24;
	rest	= dbc & 0xffffff;

	/*
	**	Take into account dma fifo and various buffers and latches,
	**	only if the interrupted phase is an OUTPUT phase.
	*/

	if ((cmd & 1) == 0) {
		u_char	ctest5, ss0, ss2;
		u16	delta;

		ctest5 = (np->rv_ctest5 & DFS) ? INB (nc_ctest5) : 0;
		if (ctest5 & DFS)
			delta=(((ctest5 << 8) | (INB (nc_dfifo) & 0xff)) - rest) & 0x3ff;
		else
			delta=(INB (nc_dfifo) - rest) & 0x7f;

		/*
		**	The data in the dma fifo has not been transferred to
		**	the target -> add the amount to the rest
		**	and clear the data.
		**	Check the sstat2 register in case of wide transfer.
		*/

		rest += delta;
		ss0  = INB (nc_sstat0);
		if (ss0 & OLF) rest++;
		if (ss0 & ORF) rest++;
		if (INB(nc_scntl3) & EWS) {
			ss2 = INB (nc_sstat2);
			if (ss2 & OLF1) rest++;
			if (ss2 & ORF1) rest++;
		}

		if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
			printk ("P%x%x RL=%d D=%d SS0=%x ", cmd&7, sbcl&7,
				(unsigned) rest, (unsigned) delta, ss0);

	} else	{
		if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
			printk ("P%x%x RL=%d ", cmd&7, sbcl&7, rest);
	}

	/*
	**	Clear fifos.
	*/
	OUTONB (nc_ctest3, CLF );	/* clear dma fifo  */
	OUTB (nc_stest3, TE|CSF);	/* clear scsi fifo */

	/*
	**	locate matching cp.
	**	if the interrupted phase is DATA IN or DATA OUT,
	**	trust the global header.
	*/
	dsa = INL (nc_dsa);
	if (!(cmd & 6)) {
		cp = np->header.cp;
		if (CCB_PHYS(cp, phys) != dsa)
			cp = NULL;
	} else {
		cp  = np->ccb;
		while (cp && (CCB_PHYS (cp, phys) != dsa))
			cp = cp->link_ccb;
	}

	/*
	**	try to find the interrupted script command,
	**	and the address at which to continue.
	*/
	vdsp	= NULL;
	nxtdsp	= 0;
	if	(dsp >  np->p_script &&
		 dsp <= np->p_script + sizeof(struct script)) {
		vdsp = (u32 *)((char*)np->script0 + (dsp-np->p_script-8));
		nxtdsp = dsp;
	}
	else if	(dsp >  np->p_scripth &&
		 dsp <= np->p_scripth + sizeof(struct scripth)) {
		vdsp = (u32 *)((char*)np->scripth0 + (dsp-np->p_scripth-8));
		nxtdsp = dsp;
	}
	else if (cp) {
		if	(dsp == CCB_PHYS (cp, patch[2])) {
			vdsp = &cp->patch[0];
			nxtdsp = scr_to_cpu(vdsp[3]);
		}
		else if (dsp == CCB_PHYS (cp, patch[6])) {
			vdsp = &cp->patch[4];
			nxtdsp = scr_to_cpu(vdsp[3]);
		}
	}

	/*
	**	log the information
	*/

	if (DEBUG_FLAGS & DEBUG_PHASE) {
		printk ("\nCP=%p CP2=%p DSP=%x NXT=%x VDSP=%p CMD=%x ",
			cp, np->header.cp,
			(unsigned)dsp,
			(unsigned)nxtdsp, vdsp, cmd);
	}

	/*
	**	cp=0 means that the DSA does not point to a valid control 
	**	block. This should not happen since we donnot use multi-byte 
	**	move while we are being reselected ot after command complete.
	**	We are not able to recover from such a phase error.
	*/
	if (!cp) {
		printk ("%s: SCSI phase error fixup: "
			"CCB already dequeued (0x%08lx)\n", 
			ncr_name (np), (u_long) np->header.cp);
		goto reset_all;
	}

	/*
	**	get old startaddress and old length.
	*/

	oadr = scr_to_cpu(vdsp[1]);

	if (cmd & 0x10) {	/* Table indirect */
		tblp = (u32 *) ((char*) &cp->phys + oadr);
		olen = scr_to_cpu(tblp[0]);
		oadr = scr_to_cpu(tblp[1]);
	} else {
		tblp = (u32 *) 0;
		olen = scr_to_cpu(vdsp[0]) & 0xffffff;
	}

	if (DEBUG_FLAGS & DEBUG_PHASE) {
		printk ("OCMD=%x\nTBLP=%p OLEN=%x OADR=%x\n",
			(unsigned) (scr_to_cpu(vdsp[0]) >> 24),
			tblp,
			(unsigned) olen,
			(unsigned) oadr);
	}

	/*
	**	check cmd against assumed interrupted script command.
	*/

	if (cmd != (scr_to_cpu(vdsp[0]) >> 24)) {
		PRINT_ADDR(cp->cmd, "internal error: cmd=%02x != %02x=(vdsp[0] "
				">> 24)\n", cmd, scr_to_cpu(vdsp[0]) >> 24);

		goto reset_all;
	}

	/*
	**	cp != np->header.cp means that the header of the CCB 
	**	currently being processed has not yet been copied to 
	**	the global header area. That may happen if the device did 
	**	not accept all our messages after having been selected.
	*/
	if (cp != np->header.cp) {
		printk ("%s: SCSI phase error fixup: "
			"CCB address mismatch (0x%08lx != 0x%08lx)\n", 
			ncr_name (np), (u_long) cp, (u_long) np->header.cp);
	}

	/*
	**	if old phase not dataphase, leave here.
	*/

	if (cmd & 0x06) {
		PRINT_ADDR(cp->cmd, "phase change %x-%x %d@%08x resid=%d.\n",
			cmd&7, sbcl&7, (unsigned)olen,
			(unsigned)oadr, (unsigned)rest);
		goto unexpected_phase;
	}

	/*
	**	choose the correct patch area.
	**	if savep points to one, choose the other.
	*/

	newcmd = cp->patch;
	newtmp = CCB_PHYS (cp, patch);
	if (newtmp == scr_to_cpu(cp->phys.header.savep)) {
		newcmd = &cp->patch[4];
		newtmp = CCB_PHYS (cp, patch[4]);
	}

	/*
	**	fillin the commands
	*/

	newcmd[0] = cpu_to_scr(((cmd & 0x0f) << 24) | rest);
	newcmd[1] = cpu_to_scr(oadr + olen - rest);
	newcmd[2] = cpu_to_scr(SCR_JUMP);
	newcmd[3] = cpu_to_scr(nxtdsp);

	if (DEBUG_FLAGS & DEBUG_PHASE) {
		PRINT_ADDR(cp->cmd, "newcmd[%d] %x %x %x %x.\n",
			(int) (newcmd - cp->patch),
			(unsigned)scr_to_cpu(newcmd[0]),
			(unsigned)scr_to_cpu(newcmd[1]),
			(unsigned)scr_to_cpu(newcmd[2]),
			(unsigned)scr_to_cpu(newcmd[3]));
	}
	/*
	**	fake the return address (to the patch).
	**	and restart script processor at dispatcher.
	*/
	OUTL (nc_temp, newtmp);
	OUTL_DSP (NCB_SCRIPT_PHYS (np, dispatch));
	return;

	/*
	**	Unexpected phase changes that occurs when the current phase 
	**	is not a DATA IN or DATA OUT phase are due to error conditions.
	**	Such event may only happen when the SCRIPTS is using a 
	**	multibyte SCSI MOVE.
	**
	**	Phase change		Some possible cause
	**
	**	COMMAND  --> MSG IN	SCSI parity error detected by target.
	**	COMMAND  --> STATUS	Bad command or refused by target.
	**	MSG OUT  --> MSG IN     Message rejected by target.
	**	MSG OUT  --> COMMAND    Bogus target that discards extended
	**				negotiation messages.
	**
	**	The code below does not care of the new phase and so 
	**	trusts the target. Why to annoy it ?
	**	If the interrupted phase is COMMAND phase, we restart at
	**	dispatcher.
	**	If a target does not get all the messages after selection, 
	**	the code assumes blindly that the target discards extended 
	**	messages and clears the negotiation status.
	**	If the target does not want all our response to negotiation,
	**	we force a SIR_NEGO_PROTO interrupt (it is a hack that avoids 
	**	bloat for such a should_not_happen situation).
	**	In all other situation, we reset the BUS.
	**	Are these assumptions reasonable ? (Wait and see ...)
	*/
unexpected_phase:
	dsp -= 8;
	nxtdsp = 0;

	switch (cmd & 7) {
	case 2:	/* COMMAND phase */
		nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
		break;
#if 0
	case 3:	/* STATUS  phase */
		nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
		break;
#endif
	case 6:	/* MSG OUT phase */
		np->scripth->nxtdsp_go_on[0] = cpu_to_scr(dsp + 8);
		if	(dsp == NCB_SCRIPT_PHYS (np, send_ident)) {
			cp->host_status = HS_BUSY;
			nxtdsp = NCB_SCRIPTH_PHYS (np, clratn_go_on);
		}
		else if	(dsp == NCB_SCRIPTH_PHYS (np, send_wdtr) ||
			 dsp == NCB_SCRIPTH_PHYS (np, send_sdtr)) {
			nxtdsp = NCB_SCRIPTH_PHYS (np, nego_bad_phase);
		}
		break;
#if 0
	case 7:	/* MSG IN  phase */
		nxtdsp = NCB_SCRIPT_PHYS (np, clrack);
		break;
#endif
	}

	if (nxtdsp) {
		OUTL_DSP (nxtdsp);
		return;
	}

reset_all:
	ncr_start_reset(np);
}


static void ncr_sir_to_redo(struct ncb *np, int num, struct ccb *cp)
{
	struct scsi_cmnd *cmd	= cp->cmd;
	struct tcb *tp	= &np->target[cmd->device->id];
	struct lcb *lp	= tp->lp[cmd->device->lun];
	struct list_head *qp;
	struct ccb *	cp2;
	int		disc_cnt = 0;
	int		busy_cnt = 0;
	u32		startp;
	u_char		s_status = INB (SS_PRT);

	/*
	**	Let the SCRIPTS processor skip all not yet started CCBs,
	**	and count disconnected CCBs. Since the busy queue is in 
	**	the same order as the chip start queue, disconnected CCBs 
	**	are before cp and busy ones after.
	*/
	if (lp) {
		qp = lp->busy_ccbq.prev;
		while (qp != &lp->busy_ccbq) {
			cp2 = list_entry(qp, struct ccb, link_ccbq);
			qp  = qp->prev;
			++busy_cnt;
			if (cp2 == cp)
				break;
			cp2->start.schedule.l_paddr =
			cpu_to_scr(NCB_SCRIPTH_PHYS (np, skip));
		}
		lp->held_ccb = cp;	/* Requeue when this one completes */
		disc_cnt = lp->queuedccbs - busy_cnt;
	}

	switch(s_status) {
	default:	/* Just for safety, should never happen */
	case S_QUEUE_FULL:
		/*
		**	Decrease number of tags to the number of 
		**	disconnected commands.
		*/
		if (!lp)
			goto out;
		if (bootverbose >= 1) {
			PRINT_ADDR(cmd, "QUEUE FULL! %d busy, %d disconnected "
					"CCBs\n", busy_cnt, disc_cnt);
		}
		if (disc_cnt < lp->numtags) {
			lp->numtags	= disc_cnt > 2 ? disc_cnt : 2;
			lp->num_good	= 0;
			ncr_setup_tags (np, cmd->device);
		}
		/*
		**	Requeue the command to the start queue.
		**	If any disconnected commands,
		**		Clear SIGP.
		**		Jump to reselect.
		*/
		cp->phys.header.savep = cp->startp;
		cp->host_status = HS_BUSY;
		cp->scsi_status = S_ILLEGAL;

		ncr_put_start_queue(np, cp);
		if (disc_cnt)
			INB (nc_ctest2);		/* Clear SIGP */
		OUTL_DSP (NCB_SCRIPT_PHYS (np, reselect));
		return;
	case S_TERMINATED:
	case S_CHECK_COND:
		/*
		**	If we were requesting sense, give up.
		*/
		if (cp->auto_sense)
			goto out;

		/*
		**	Device returned CHECK CONDITION status.
		**	Prepare all needed data strutures for getting 
		**	sense data.
		**
		**	identify message
		*/
		cp->scsi_smsg2[0]	= IDENTIFY(0, cmd->device->lun);
		cp->phys.smsg.addr	= cpu_to_scr(CCB_PHYS (cp, scsi_smsg2));
		cp->phys.smsg.size	= cpu_to_scr(1);

		/*
		**	sense command
		*/
		cp->phys.cmd.addr	= cpu_to_scr(CCB_PHYS (cp, sensecmd));
		cp->phys.cmd.size	= cpu_to_scr(6);

		/*
		**	patch requested size into sense command
		*/
		cp->sensecmd[0]		= 0x03;
		cp->sensecmd[1]		= cmd->device->lun << 5;
		cp->sensecmd[4]		= sizeof(cp->sense_buf);

		/*
		**	sense data
		*/
		memset(cp->sense_buf, 0, sizeof(cp->sense_buf));
		cp->phys.sense.addr	= cpu_to_scr(CCB_PHYS(cp,sense_buf[0]));
		cp->phys.sense.size	= cpu_to_scr(sizeof(cp->sense_buf));

		/*
		**	requeue the command.
		*/
		startp = cpu_to_scr(NCB_SCRIPTH_PHYS (np, sdata_in));

		cp->phys.header.savep	= startp;
		cp->phys.header.goalp	= startp + 24;
		cp->phys.header.lastp	= startp;
		cp->phys.header.wgoalp	= startp + 24;
		cp->phys.header.wlastp	= startp;

		cp->host_status = HS_BUSY;
		cp->scsi_status = S_ILLEGAL;
		cp->auto_sense	= s_status;

		cp->start.schedule.l_paddr =
			cpu_to_scr(NCB_SCRIPT_PHYS (np, select));

		/*
		**	Select without ATN for quirky devices.
		*/
		if (cmd->device->select_no_atn)
			cp->start.schedule.l_paddr =
			cpu_to_scr(NCB_SCRIPTH_PHYS (np, select_no_atn));

		ncr_put_start_queue(np, cp);

		OUTL_DSP (NCB_SCRIPT_PHYS (np, start));
		return;
	}

out:
	OUTONB_STD ();
	return;
}


/*==========================================================
**
**
**      ncr chip exception handler for programmed interrupts.
**
**
**==========================================================
*/

void ncr_int_sir (struct ncb *np)
{
	u_char scntl3;
	u_char chg, ofs, per, fak, wide;
	u_char num = INB (nc_dsps);
	struct ccb *cp=NULL;
	u_long	dsa    = INL (nc_dsa);
	u_char	target = INB (nc_sdid) & 0x0f;
	struct tcb *tp     = &np->target[target];
	struct scsi_target *starget = tp->starget;

	if (DEBUG_FLAGS & DEBUG_TINY) printk ("I#%d", num);

	switch (num) {
	case SIR_INTFLY:
		/*
		**	This is used for HP Zalon/53c720 where INTFLY
		**	operation is currently broken.
		*/
		ncr_wakeup_done(np);
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
		OUTL(nc_dsp, NCB_SCRIPT_PHYS (np, done_end) + 8);
#else
		OUTL(nc_dsp, NCB_SCRIPT_PHYS (np, start));
#endif
		return;
	case SIR_RESEL_NO_MSG_IN:
	case SIR_RESEL_NO_IDENTIFY:
		/*
		**	If devices reselecting without sending an IDENTIFY 
		**	message still exist, this should help.
		**	We just assume lun=0, 1 CCB, no tag.
		*/
		if (tp->lp[0]) { 
			OUTL_DSP (scr_to_cpu(tp->lp[0]->jump_ccb[0]));
			return;
		}
	case SIR_RESEL_BAD_TARGET:	/* Will send a TARGET RESET message */
	case SIR_RESEL_BAD_LUN:		/* Will send a TARGET RESET message */
	case SIR_RESEL_BAD_I_T_L_Q:	/* Will send an ABORT TAG message   */
	case SIR_RESEL_BAD_I_T_L:	/* Will send an ABORT message	    */
		printk ("%s:%d: SIR %d, "
			"incorrect nexus identification on reselection\n",
			ncr_name (np), target, num);
		goto out;
	case SIR_DONE_OVERFLOW:
		printk ("%s:%d: SIR %d, "
			"CCB done queue overflow\n",
			ncr_name (np), target, num);
		goto out;
	case SIR_BAD_STATUS:
		cp = np->header.cp;
		if (!cp || CCB_PHYS (cp, phys) != dsa)
			goto out;
		ncr_sir_to_redo(np, num, cp);
		return;
	default:
		/*
		**	lookup the ccb
		*/
		cp = np->ccb;
		while (cp && (CCB_PHYS (cp, phys) != dsa))
			cp = cp->link_ccb;

		BUG_ON(!cp);
		BUG_ON(cp != np->header.cp);

		if (!cp || cp != np->header.cp)
			goto out;
	}

	switch (num) {
/*-----------------------------------------------------------------------------
**
**	Was Sie schon immer ueber transfermode negotiation wissen wollten ...
**	("Everything you've always wanted to know about transfer mode
**	  negotiation")
**
**	We try to negotiate sync and wide transfer only after
**	a successful inquire command. We look at byte 7 of the
**	inquire data to determine the capabilities of the target.
**
**	When we try to negotiate, we append the negotiation message
**	to the identify and (maybe) simple tag message.
**	The host status field is set to HS_NEGOTIATE to mark this
**	situation.
**
**	If the target doesn't answer this message immediately
**	(as required by the standard), the SIR_NEGO_FAIL interrupt
**	will be raised eventually.
**	The handler removes the HS_NEGOTIATE status, and sets the
**	negotiated value to the default (async / nowide).
**
**	If we receive a matching answer immediately, we check it
**	for validity, and set the values.
**
**	If we receive a Reject message immediately, we assume the
**	negotiation has failed, and fall back to standard values.
**
**	If we receive a negotiation message while not in HS_NEGOTIATE
**	state, it's a target initiated negotiation. We prepare a
**	(hopefully) valid answer, set our parameters, and send back 
**	this answer to the target.
**
**	If the target doesn't fetch the answer (no message out phase),
**	we assume the negotiation has failed, and fall back to default
**	settings.
**
**	When we set the values, we adjust them in all ccbs belonging 
**	to this target, in the controller's register, and in the "phys"
**	field of the controller's struct ncb.
**
**	Possible cases:		   hs  sir   msg_in value  send   goto
**	We try to negotiate:
**	-> target doesn't msgin    NEG FAIL  noop   defa.  -      dispatch
**	-> target rejected our msg NEG FAIL  reject defa.  -      dispatch
**	-> target answered  (ok)   NEG SYNC  sdtr   set    -      clrack
**	-> target answered (!ok)   NEG SYNC  sdtr   defa.  REJ--->msg_bad
**	-> target answered  (ok)   NEG WIDE  wdtr   set    -      clrack
**	-> target answered (!ok)   NEG WIDE  wdtr   defa.  REJ--->msg_bad
**	-> any other msgin	   NEG FAIL  noop   defa.  -      dispatch
**
**	Target tries to negotiate:
**	-> incoming message	   --- SYNC  sdtr   set    SDTR   -
**	-> incoming message	   --- WIDE  wdtr   set    WDTR   -
**      We sent our answer:
**	-> target doesn't msgout   --- PROTO ?      defa.  -      dispatch
**
**-----------------------------------------------------------------------------
*/

	case SIR_NEGO_FAILED:
		/*-------------------------------------------------------
		**
		**	Negotiation failed.
		**	Target doesn't send an answer message,
		**	or target rejected our message.
		**
		**      Remove negotiation request.
		**
		**-------------------------------------------------------
		*/
		OUTB (HS_PRT, HS_BUSY);

		/* fall through */

	case SIR_NEGO_PROTO:
		/*-------------------------------------------------------
		**
		**	Negotiation failed.
		**	Target doesn't fetch the answer message.
		**
		**-------------------------------------------------------
		*/

		if (DEBUG_FLAGS & DEBUG_NEGO) {
			PRINT_ADDR(cp->cmd, "negotiation failed sir=%x "
					"status=%x.\n", num, cp->nego_status);
		}

		/*
		**	any error in negotiation:
		**	fall back to default mode.
		*/
		switch (cp->nego_status) {

		case NS_SYNC:
			spi_period(starget) = 0;
			spi_offset(starget) = 0;
			ncr_setsync (np, cp, 0, 0xe0);
			break;

		case NS_WIDE:
			spi_width(starget) = 0;
			ncr_setwide (np, cp, 0, 0);
			break;

		}
		np->msgin [0] = NOP;
		np->msgout[0] = NOP;
		cp->nego_status = 0;
		break;

	case SIR_NEGO_SYNC:
		if (DEBUG_FLAGS & DEBUG_NEGO) {
			ncr_print_msg(cp, "sync msgin", np->msgin);
		}

		chg = 0;
		per = np->msgin[3];
		ofs = np->msgin[4];
		if (ofs==0) per=255;

		/*
		**      if target sends SDTR message,
		**	      it CAN transfer synch.
		*/

		if (ofs && starget)
			spi_support_sync(starget) = 1;

		/*
		**	check values against driver limits.
		*/

		if (per < np->minsync)
			{chg = 1; per = np->minsync;}
		if (per < tp->minsync)
			{chg = 1; per = tp->minsync;}
		if (ofs > tp->maxoffs)
			{chg = 1; ofs = tp->maxoffs;}

		/*
		**	Check against controller limits.
		*/
		fak	= 7;
		scntl3	= 0;
		if (ofs != 0) {
			ncr_getsync(np, per, &fak, &scntl3);
			if (fak > 7) {
				chg = 1;
				ofs = 0;
			}
		}
		if (ofs == 0) {
			fak	= 7;
			per	= 0;
			scntl3	= 0;
			tp->minsync = 0;
		}

		if (DEBUG_FLAGS & DEBUG_NEGO) {
			PRINT_ADDR(cp->cmd, "sync: per=%d scntl3=0x%x ofs=%d "
				"fak=%d chg=%d.\n", per, scntl3, ofs, fak, chg);
		}

		if (INB (HS_PRT) == HS_NEGOTIATE) {
			OUTB (HS_PRT, HS_BUSY);
			switch (cp->nego_status) {

			case NS_SYNC:
				/* This was an answer message */
				if (chg) {
					/* Answer wasn't acceptable.  */
					spi_period(starget) = 0;
					spi_offset(starget) = 0;
					ncr_setsync(np, cp, 0, 0xe0);
					OUTL_DSP(NCB_SCRIPT_PHYS (np, msg_bad));
				} else {
					/* Answer is ok.  */
					spi_period(starget) = per;
					spi_offset(starget) = ofs;
					ncr_setsync(np, cp, scntl3, (fak<<5)|ofs);
					OUTL_DSP(NCB_SCRIPT_PHYS (np, clrack));
				}
				return;

			case NS_WIDE:
				spi_width(starget) = 0;
				ncr_setwide(np, cp, 0, 0);
				break;
			}
		}

		/*
		**	It was a request. Set value and
		**      prepare an answer message
		*/

		spi_period(starget) = per;
		spi_offset(starget) = ofs;
		ncr_setsync(np, cp, scntl3, (fak<<5)|ofs);

		spi_populate_sync_msg(np->msgout, per, ofs);
		cp->nego_status = NS_SYNC;

		if (DEBUG_FLAGS & DEBUG_NEGO) {
			ncr_print_msg(cp, "sync msgout", np->msgout);
		}

		if (!ofs) {
			OUTL_DSP (NCB_SCRIPT_PHYS (np, msg_bad));
			return;
		}
		np->msgin [0] = NOP;

		break;

	case SIR_NEGO_WIDE:
		/*
		**	Wide request message received.
		*/
		if (DEBUG_FLAGS & DEBUG_NEGO) {
			ncr_print_msg(cp, "wide msgin", np->msgin);
		}

		/*
		**	get requested values.
		*/

		chg  = 0;
		wide = np->msgin[3];

		/*
		**      if target sends WDTR message,
		**	      it CAN transfer wide.
		*/

		if (wide && starget)
			spi_support_wide(starget) = 1;

		/*
		**	check values against driver limits.
		*/

		if (wide > tp->usrwide)
			{chg = 1; wide = tp->usrwide;}

		if (DEBUG_FLAGS & DEBUG_NEGO) {
			PRINT_ADDR(cp->cmd, "wide: wide=%d chg=%d.\n", wide,
					chg);
		}

		if (INB (HS_PRT) == HS_NEGOTIATE) {
			OUTB (HS_PRT, HS_BUSY);
			switch (cp->nego_status) {

			case NS_WIDE:
				/*
				**      This was an answer message
				*/
				if (chg) {
					/* Answer wasn't acceptable.  */
					spi_width(starget) = 0;
					ncr_setwide(np, cp, 0, 1);
					OUTL_DSP (NCB_SCRIPT_PHYS (np, msg_bad));
				} else {
					/* Answer is ok.  */
					spi_width(starget) = wide;
					ncr_setwide(np, cp, wide, 1);
					OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
				}
				return;

			case NS_SYNC:
				spi_period(starget) = 0;
				spi_offset(starget) = 0;
				ncr_setsync(np, cp, 0, 0xe0);
				break;
			}
		}

		/*
		**	It was a request, set value and
		**      prepare an answer message
		*/

		spi_width(starget) = wide;
		ncr_setwide(np, cp, wide, 1);
		spi_populate_width_msg(np->msgout, wide);

		np->msgin [0] = NOP;

		cp->nego_status = NS_WIDE;

		if (DEBUG_FLAGS & DEBUG_NEGO) {
			ncr_print_msg(cp, "wide msgout", np->msgin);
		}
		break;

/*--------------------------------------------------------------------
**
**	Processing of special messages
**
**--------------------------------------------------------------------
*/

	case SIR_REJECT_RECEIVED:
		/*-----------------------------------------------
		**
		**	We received a MESSAGE_REJECT.
		**
		**-----------------------------------------------
		*/

		PRINT_ADDR(cp->cmd, "MESSAGE_REJECT received (%x:%x).\n",
			(unsigned)scr_to_cpu(np->lastmsg), np->msgout[0]);
		break;

	case SIR_REJECT_SENT:
		/*-----------------------------------------------
		**
		**	We received an unknown message
		**
		**-----------------------------------------------
		*/

		ncr_print_msg(cp, "MESSAGE_REJECT sent for", np->msgin);
		break;

/*--------------------------------------------------------------------
**
**	Processing of special messages
**
**--------------------------------------------------------------------
*/

	case SIR_IGN_RESIDUE:
		/*-----------------------------------------------
		**
		**	We received an IGNORE RESIDUE message,
		**	which couldn't be handled by the script.
		**
		**-----------------------------------------------
		*/

		PRINT_ADDR(cp->cmd, "IGNORE_WIDE_RESIDUE received, but not yet "
				"implemented.\n");
		break;
#if 0
	case SIR_MISSING_SAVE:
		/*-----------------------------------------------
		**
		**	We received an DISCONNECT message,
		**	but the datapointer wasn't saved before.
		**
		**-----------------------------------------------
		*/

		PRINT_ADDR(cp->cmd, "DISCONNECT received, but datapointer "
				"not saved: data=%x save=%x goal=%x.\n",
			(unsigned) INL (nc_temp),
			(unsigned) scr_to_cpu(np->header.savep),
			(unsigned) scr_to_cpu(np->header.goalp));
		break;
#endif
	}

out:
	OUTONB_STD ();
}

/*==========================================================
**
**
**	Acquire a control block
**
**
**==========================================================
*/

static struct ccb *ncr_get_ccb(struct ncb *np, struct scsi_cmnd *cmd)
{
	u_char tn = cmd->device->id;
	u_char ln = cmd->device->lun;
	struct tcb *tp = &np->target[tn];
	struct lcb *lp = tp->lp[ln];
	u_char tag = NO_TAG;
	struct ccb *cp = NULL;

	/*
	**	Lun structure available ?
	*/
	if (lp) {
		struct list_head *qp;
		/*
		**	Keep from using more tags than we can handle.
		*/
		if (lp->usetags && lp->busyccbs >= lp->maxnxs)
			return NULL;

		/*
		**	Allocate a new CCB if needed.
		*/
		if (list_empty(&lp->free_ccbq))
			ncr_alloc_ccb(np, tn, ln);

		/*
		**	Look for free CCB
		*/
		qp = ncr_list_pop(&lp->free_ccbq);
		if (qp) {
			cp = list_entry(qp, struct ccb, link_ccbq);
			if (cp->magic) {
				PRINT_ADDR(cmd, "ccb free list corrupted "
						"(@%p)\n", cp);
				cp = NULL;
			} else {
				list_add_tail(qp, &lp->wait_ccbq);
				++lp->busyccbs;
			}
		}

		/*
		**	If a CCB is available,
		**	Get a tag for this nexus if required.
		*/
		if (cp) {
			if (lp->usetags)
				tag = lp->cb_tags[lp->ia_tag];
		}
		else if (lp->actccbs > 0)
			return NULL;
	}

	/*
	**	if nothing available, take the default.
	*/
	if (!cp)
		cp = np->ccb;

	/*
	**	Wait until available.
	*/
#if 0
	while (cp->magic) {
		if (flags & SCSI_NOSLEEP) break;
		if (tsleep ((caddr_t)cp, PRIBIO|PCATCH, "ncr", 0))
			break;
	}
#endif

	if (cp->magic)
		return NULL;

	cp->magic = 1;

	/*
	**	Move to next available tag if tag used.
	*/
	if (lp) {
		if (tag != NO_TAG) {
			++lp->ia_tag;
			if (lp->ia_tag == MAX_TAGS)
				lp->ia_tag = 0;
			lp->tags_umap |= (((tagmap_t) 1) << tag);
		}
	}

	/*
	**	Remember all informations needed to free this CCB.
	*/
	cp->tag	   = tag;
	cp->target = tn;
	cp->lun    = ln;

	if (DEBUG_FLAGS & DEBUG_TAGS) {
		PRINT_ADDR(cmd, "ccb @%p using tag %d.\n", cp, tag);
	}

	return cp;
}

/*==========================================================
**
**
**	Release one control block
**
**
**==========================================================
*/

static void ncr_free_ccb (struct ncb *np, struct ccb *cp)
{
	struct tcb *tp = &np->target[cp->target];
	struct lcb *lp = tp->lp[cp->lun];

	if (DEBUG_FLAGS & DEBUG_TAGS) {
		PRINT_ADDR(cp->cmd, "ccb @%p freeing tag %d.\n", cp, cp->tag);
	}

	/*
	**	If lun control block available,
	**	decrement active commands and increment credit, 
	**	free the tag if any and remove the JUMP for reselect.
	*/
	if (lp) {
		if (cp->tag != NO_TAG) {
			lp->cb_tags[lp->if_tag++] = cp->tag;
			if (lp->if_tag == MAX_TAGS)
				lp->if_tag = 0;
			lp->tags_umap &= ~(((tagmap_t) 1) << cp->tag);
			lp->tags_smap &= lp->tags_umap;
			lp->jump_ccb[cp->tag] =
				cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l_q));
		} else {
			lp->jump_ccb[0] =
				cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l));
		}
	}

	/*
	**	Make this CCB available.
	*/

	if (lp) {
		if (cp != np->ccb)
			list_move(&cp->link_ccbq, &lp->free_ccbq);
		--lp->busyccbs;
		if (cp->queued) {
			--lp->queuedccbs;
		}
	}
	cp -> host_status = HS_IDLE;
	cp -> magic = 0;
	if (cp->queued) {
		--np->queuedccbs;
		cp->queued = 0;
	}

#if 0
	if (cp == np->ccb)
		wakeup ((caddr_t) cp);
#endif
}


#define ncr_reg_bus_addr(r) (np->paddr + offsetof (struct ncr_reg, r))

/*------------------------------------------------------------------------
**	Initialize the fixed part of a CCB structure.
**------------------------------------------------------------------------
**------------------------------------------------------------------------
*/
static void ncr_init_ccb(struct ncb *np, struct ccb *cp)
{
	ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);

	/*
	**	Remember virtual and bus address of this ccb.
	*/
	cp->p_ccb 	   = vtobus(cp);
	cp->phys.header.cp = cp;

	/*
	**	This allows list_del to work for the default ccb.
	*/
	INIT_LIST_HEAD(&cp->link_ccbq);

	/*
	**	Initialyze the start and restart launch script.
	**
	**	COPY(4) @(...p_phys), @(dsa)
	**	JUMP @(sched_point)
	*/
	cp->start.setup_dsa[0]	 = cpu_to_scr(copy_4);
	cp->start.setup_dsa[1]	 = cpu_to_scr(CCB_PHYS(cp, start.p_phys));
	cp->start.setup_dsa[2]	 = cpu_to_scr(ncr_reg_bus_addr(nc_dsa));
	cp->start.schedule.l_cmd = cpu_to_scr(SCR_JUMP);
	cp->start.p_phys	 = cpu_to_scr(CCB_PHYS(cp, phys));

	memcpy(&cp->restart, &cp->start, sizeof(cp->restart));

	cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
	cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
}


/*------------------------------------------------------------------------
**	Allocate a CCB and initialize its fixed part.
**------------------------------------------------------------------------
**------------------------------------------------------------------------
*/
static void ncr_alloc_ccb(struct ncb *np, u_char tn, u_char ln)
{
	struct tcb *tp = &np->target[tn];
	struct lcb *lp = tp->lp[ln];
	struct ccb *cp = NULL;

	/*
	**	Allocate memory for this CCB.
	*/
	cp = m_calloc_dma(sizeof(struct ccb), "CCB");
	if (!cp)
		return;

	/*
	**	Count it and initialyze it.
	*/
	lp->actccbs++;
	np->actccbs++;
	memset(cp, 0, sizeof (*cp));
	ncr_init_ccb(np, cp);

	/*
	**	Chain into wakeup list and free ccb queue and take it 
	**	into account for tagged commands.
	*/
	cp->link_ccb      = np->ccb->link_ccb;
	np->ccb->link_ccb = cp;

	list_add(&cp->link_ccbq, &lp->free_ccbq);
}

/*==========================================================
**
**
**      Allocation of resources for Targets/Luns/Tags.
**
**
**==========================================================
*/


/*------------------------------------------------------------------------
**	Target control block initialisation.
**------------------------------------------------------------------------
**	This data structure is fully initialized after a SCSI command 
**	has been successfully completed for this target.
**	It contains a SCRIPT that is called on target reselection.
**------------------------------------------------------------------------
*/
static void ncr_init_tcb (struct ncb *np, u_char tn)
{
	struct tcb *tp = &np->target[tn];
	ncrcmd copy_1 = np->features & FE_PFEN ? SCR_COPY(1) : SCR_COPY_F(1);
	int th = tn & 3;
	int i;

	/*
	**	Jump to next tcb if SFBR does not match this target.
	**	JUMP  IF (SFBR != #target#), @(next tcb)
	*/
	tp->jump_tcb.l_cmd   =
		cpu_to_scr((SCR_JUMP ^ IFFALSE (DATA (0x80 + tn))));
	tp->jump_tcb.l_paddr = np->jump_tcb[th].l_paddr;

	/*
	**	Load the synchronous transfer register.
	**	COPY @(tp->sval), @(sxfer)
	*/
	tp->getscr[0] =	cpu_to_scr(copy_1);
	tp->getscr[1] = cpu_to_scr(vtobus (&tp->sval));
#ifdef SCSI_NCR_BIG_ENDIAN
	tp->getscr[2] = cpu_to_scr(ncr_reg_bus_addr(nc_sxfer) ^ 3);
#else
	tp->getscr[2] = cpu_to_scr(ncr_reg_bus_addr(nc_sxfer));
#endif

	/*
	**	Load the timing register.
	**	COPY @(tp->wval), @(scntl3)
	*/
	tp->getscr[3] =	cpu_to_scr(copy_1);
	tp->getscr[4] = cpu_to_scr(vtobus (&tp->wval));
#ifdef SCSI_NCR_BIG_ENDIAN
	tp->getscr[5] = cpu_to_scr(ncr_reg_bus_addr(nc_scntl3) ^ 3);
#else
	tp->getscr[5] = cpu_to_scr(ncr_reg_bus_addr(nc_scntl3));
#endif

	/*
	**	Get the IDENTIFY message and the lun.
	**	CALL @script(resel_lun)
	*/
	tp->call_lun.l_cmd   = cpu_to_scr(SCR_CALL);
	tp->call_lun.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_lun));

	/*
	**	Look for the lun control block of this nexus.
	**	For i = 0 to 3
	**		JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
	*/
	for (i = 0 ; i < 4 ; i++) {
		tp->jump_lcb[i].l_cmd   =
				cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
		tp->jump_lcb[i].l_paddr =
				cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_identify));
	}

	/*
	**	Link this target control block to the JUMP chain.
	*/
	np->jump_tcb[th].l_paddr = cpu_to_scr(vtobus (&tp->jump_tcb));

	/*
	**	These assert's should be moved at driver initialisations.
	*/
#ifdef SCSI_NCR_BIG_ENDIAN
	BUG_ON(((offsetof(struct ncr_reg, nc_sxfer) ^
		 offsetof(struct tcb    , sval    )) &3) != 3);
	BUG_ON(((offsetof(struct ncr_reg, nc_scntl3) ^
		 offsetof(struct tcb    , wval    )) &3) != 3);
#else
	BUG_ON(((offsetof(struct ncr_reg, nc_sxfer) ^
		 offsetof(struct tcb    , sval    )) &3) != 0);
	BUG_ON(((offsetof(struct ncr_reg, nc_scntl3) ^
		 offsetof(struct tcb    , wval    )) &3) != 0);
#endif
}


/*------------------------------------------------------------------------
**	Lun control block allocation and initialization.
**------------------------------------------------------------------------
**	This data structure is allocated and initialized after a SCSI 
**	command has been successfully completed for this target/lun.
**------------------------------------------------------------------------
*/
static struct lcb *ncr_alloc_lcb (struct ncb *np, u_char tn, u_char ln)
{
	struct tcb *tp = &np->target[tn];
	struct lcb *lp = tp->lp[ln];
	ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);
	int lh = ln & 3;

	/*
	**	Already done, return.
	*/
	if (lp)
		return lp;

	/*
	**	Allocate the lcb.
	*/
	lp = m_calloc_dma(sizeof(struct lcb), "LCB");
	if (!lp)
		goto fail;
	memset(lp, 0, sizeof(*lp));
	tp->lp[ln] = lp;

	/*
	**	Initialize the target control block if not yet.
	*/
	if (!tp->jump_tcb.l_cmd)
		ncr_init_tcb(np, tn);

	/*
	**	Initialize the CCB queue headers.
	*/
	INIT_LIST_HEAD(&lp->free_ccbq);
	INIT_LIST_HEAD(&lp->busy_ccbq);
	INIT_LIST_HEAD(&lp->wait_ccbq);
	INIT_LIST_HEAD(&lp->skip_ccbq);

	/*
	**	Set max CCBs to 1 and use the default 1 entry 
	**	jump table by default.
	*/
	lp->maxnxs	= 1;
	lp->jump_ccb	= &lp->jump_ccb_0;
	lp->p_jump_ccb	= cpu_to_scr(vtobus(lp->jump_ccb));

	/*
	**	Initilialyze the reselect script:
	**
	**	Jump to next lcb if SFBR does not match this lun.
	**	Load TEMP with the CCB direct jump table bus address.
	**	Get the SIMPLE TAG message and the tag.
	**
	**	JUMP  IF (SFBR != #lun#), @(next lcb)
	**	COPY @(lp->p_jump_ccb),	  @(temp)
	**	JUMP @script(resel_notag)
	*/
	lp->jump_lcb.l_cmd   =
		cpu_to_scr((SCR_JUMP ^ IFFALSE (MASK (0x80+ln, 0xff))));
	lp->jump_lcb.l_paddr = tp->jump_lcb[lh].l_paddr;

	lp->load_jump_ccb[0] = cpu_to_scr(copy_4);
	lp->load_jump_ccb[1] = cpu_to_scr(vtobus (&lp->p_jump_ccb));
	lp->load_jump_ccb[2] = cpu_to_scr(ncr_reg_bus_addr(nc_temp));

	lp->jump_tag.l_cmd   = cpu_to_scr(SCR_JUMP);
	lp->jump_tag.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_notag));

	/*
	**	Link this lun control block to the JUMP chain.
	*/
	tp->jump_lcb[lh].l_paddr = cpu_to_scr(vtobus (&lp->jump_lcb));

	/*
	**	Initialize command queuing control.
	*/
	lp->busyccbs	= 1;
	lp->queuedccbs	= 1;
	lp->queuedepth	= 1;
fail:
	return lp;
}


/*------------------------------------------------------------------------
**	Lun control block setup on INQUIRY data received.
**------------------------------------------------------------------------
**	We only support WIDE, SYNC for targets and CMDQ for logical units.
**	This setup is done on each INQUIRY since we are expecting user 
**	will play with CHANGE DEFINITION commands. :-)
**------------------------------------------------------------------------
*/
static struct lcb *ncr_setup_lcb (struct ncb *np, struct scsi_device *sdev)
{
	unsigned char tn = sdev->id, ln = sdev->lun;
	struct tcb *tp = &np->target[tn];
	struct lcb *lp = tp->lp[ln];

	/* If no lcb, try to allocate it.  */
	if (!lp && !(lp = ncr_alloc_lcb(np, tn, ln)))
		goto fail;

	/*
	**	If unit supports tagged commands, allocate the 
	**	CCB JUMP table if not yet.
	*/
	if (sdev->tagged_supported && lp->jump_ccb == &lp->jump_ccb_0) {
		int i;
		lp->jump_ccb = m_calloc_dma(256, "JUMP_CCB");
		if (!lp->jump_ccb) {
			lp->jump_ccb = &lp->jump_ccb_0;
			goto fail;
		}
		lp->p_jump_ccb = cpu_to_scr(vtobus(lp->jump_ccb));
		for (i = 0 ; i < 64 ; i++)
			lp->jump_ccb[i] =
				cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_i_t_l_q));
		for (i = 0 ; i < MAX_TAGS ; i++)
			lp->cb_tags[i] = i;
		lp->maxnxs = MAX_TAGS;
		lp->tags_stime = jiffies + 3*HZ;
		ncr_setup_tags (np, sdev);
	}


fail:
	return lp;
}

/*==========================================================
**
**
**	Build Scatter Gather Block
**
**
**==========================================================
**
**	The transfer area may be scattered among
**	several non adjacent physical pages.
**
**	We may use MAX_SCATTER blocks.
**
**----------------------------------------------------------
*/

/*
**	We try to reduce the number of interrupts caused
**	by unexpected phase changes due to disconnects.
**	A typical harddisk may disconnect before ANY block.
**	If we wanted to avoid unexpected phase changes at all
**	we had to use a break point every 512 bytes.
**	Of course the number of scatter/gather blocks is
**	limited.
**	Under Linux, the scatter/gatter blocks are provided by 
**	the generic driver. We just have to copy addresses and 
**	sizes to the data segment array.
*/

static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
{
	int segment	= 0;
	int use_sg	= scsi_sg_count(cmd);

	cp->data_len	= 0;

	use_sg = map_scsi_sg_data(np, cmd);
	if (use_sg > 0) {
		struct scatterlist *sg;
		struct scr_tblmove *data;

		if (use_sg > MAX_SCATTER) {
			unmap_scsi_data(np, cmd);
			return -1;
		}

		data = &cp->phys.data[MAX_SCATTER - use_sg];

		scsi_for_each_sg(cmd, sg, use_sg, segment) {
			dma_addr_t baddr = sg_dma_address(sg);
			unsigned int len = sg_dma_len(sg);

			ncr_build_sge(np, &data[segment], baddr, len);
			cp->data_len += len;
		}
	} else
		segment = -2;

	return segment;
}

/*==========================================================
**
**
**	Test the bus snoop logic :-(
**
**	Has to be called with interrupts disabled.
**
**
**==========================================================
*/

static int __init ncr_regtest (struct ncb* np)
{
	register volatile u32 data;
	/*
	**	ncr registers may NOT be cached.
	**	write 0xffffffff to a read only register area,
	**	and try to read it back.
	*/
	data = 0xffffffff;
	OUTL_OFF(offsetof(struct ncr_reg, nc_dstat), data);
	data = INL_OFF(offsetof(struct ncr_reg, nc_dstat));
#if 1
	if (data == 0xffffffff) {
#else
	if ((data & 0xe2f0fffd) != 0x02000080) {
#endif
		printk ("CACHE TEST FAILED: reg dstat-sstat2 readback %x.\n",
			(unsigned) data);
		return (0x10);
	}
	return (0);
}

static int __init ncr_snooptest (struct ncb* np)
{
	u32	ncr_rd, ncr_wr, ncr_bk, host_rd, host_wr, pc;
	int	i, err=0;
	if (np->reg) {
		err |= ncr_regtest (np);
		if (err)
			return (err);
	}

	/* init */
	pc  = NCB_SCRIPTH_PHYS (np, snooptest);
	host_wr = 1;
	ncr_wr  = 2;
	/*
	**	Set memory and register.
	*/
	np->ncr_cache = cpu_to_scr(host_wr);
	OUTL (nc_temp, ncr_wr);
	/*
	**	Start script (exchange values)
	*/
	OUTL_DSP (pc);
	/*
	**	Wait 'til done (with timeout)
	*/
	for (i=0; i<NCR_SNOOP_TIMEOUT; i++)
		if (INB(nc_istat) & (INTF|SIP|DIP))
			break;
	/*
	**	Save termination position.
	*/
	pc = INL (nc_dsp);
	/*
	**	Read memory and register.
	*/
	host_rd = scr_to_cpu(np->ncr_cache);
	ncr_rd  = INL (nc_scratcha);
	ncr_bk  = INL (nc_temp);
	/*
	**	Reset ncr chip
	*/
	ncr_chip_reset(np, 100);
	/*
	**	check for timeout
	*/
	if (i>=NCR_SNOOP_TIMEOUT) {
		printk ("CACHE TEST FAILED: timeout.\n");
		return (0x20);
	}
	/*
	**	Check termination position.
	*/
	if (pc != NCB_SCRIPTH_PHYS (np, snoopend)+8) {
		printk ("CACHE TEST FAILED: script execution failed.\n");
		printk ("start=%08lx, pc=%08lx, end=%08lx\n", 
			(u_long) NCB_SCRIPTH_PHYS (np, snooptest), (u_long) pc,
			(u_long) NCB_SCRIPTH_PHYS (np, snoopend) +8);
		return (0x40);
	}
	/*
	**	Show results.
	*/
	if (host_wr != ncr_rd) {
		printk ("CACHE TEST FAILED: host wrote %d, ncr read %d.\n",
			(int) host_wr, (int) ncr_rd);
		err |= 1;
	}
	if (host_rd != ncr_wr) {
		printk ("CACHE TEST FAILED: ncr wrote %d, host read %d.\n",
			(int) ncr_wr, (int) host_rd);
		err |= 2;
	}
	if (ncr_bk != ncr_wr) {
		printk ("CACHE TEST FAILED: ncr wrote %d, read back %d.\n",
			(int) ncr_wr, (int) ncr_bk);
		err |= 4;
	}
	return (err);
}

/*==========================================================
**
**	Determine the ncr's clock frequency.
**	This is essential for the negotiation
**	of the synchronous transfer rate.
**
**==========================================================
**
**	Note: we have to return the correct value.
**	THERE IS NO SAFE DEFAULT VALUE.
**
**	Most NCR/SYMBIOS boards are delivered with a 40 Mhz clock.
**	53C860 and 53C875 rev. 1 support fast20 transfers but 
**	do not have a clock doubler and so are provided with a 
**	80 MHz clock. All other fast20 boards incorporate a doubler 
**	and so should be delivered with a 40 MHz clock.
**	The future fast40 chips (895/895) use a 40 Mhz base clock 
**	and provide a clock quadrupler (160 Mhz). The code below 
**	tries to deal as cleverly as possible with all this stuff.
**
**----------------------------------------------------------
*/

/*
 *	Select NCR SCSI clock frequency
 */
static void ncr_selectclock(struct ncb *np, u_char scntl3)
{
	if (np->multiplier < 2) {
		OUTB(nc_scntl3,	scntl3);
		return;
	}

	if (bootverbose >= 2)
		printk ("%s: enabling clock multiplier\n", ncr_name(np));

	OUTB(nc_stest1, DBLEN);	   /* Enable clock multiplier		  */
	if (np->multiplier > 2) {  /* Poll bit 5 of stest4 for quadrupler */
		int i = 20;
		while (!(INB(nc_stest4) & LCKFRQ) && --i > 0)
			udelay(20);
		if (!i)
			printk("%s: the chip cannot lock the frequency\n", ncr_name(np));
	} else			/* Wait 20 micro-seconds for doubler	*/
		udelay(20);
	OUTB(nc_stest3, HSC);		/* Halt the scsi clock		*/
	OUTB(nc_scntl3,	scntl3);
	OUTB(nc_stest1, (DBLEN|DBLSEL));/* Select clock multiplier	*/
	OUTB(nc_stest3, 0x00);		/* Restart scsi clock 		*/
}


/*
 *	calculate NCR SCSI clock frequency (in KHz)
 */
static unsigned __init ncrgetfreq (struct ncb *np, int gen)
{
	unsigned ms = 0;
	char count = 0;

	/*
	 * Measure GEN timer delay in order 
	 * to calculate SCSI clock frequency
	 *
	 * This code will never execute too
	 * many loop iterations (if DELAY is 
	 * reasonably correct). It could get
	 * too low a delay (too high a freq.)
	 * if the CPU is slow executing the 
	 * loop for some reason (an NMI, for
	 * example). For this reason we will
	 * if multiple measurements are to be 
	 * performed trust the higher delay 
	 * (lower frequency returned).
	 */
	OUTB (nc_stest1, 0);	/* make sure clock doubler is OFF */
	OUTW (nc_sien , 0);	/* mask all scsi interrupts */
	(void) INW (nc_sist);	/* clear pending scsi interrupt */
	OUTB (nc_dien , 0);	/* mask all dma interrupts */
	(void) INW (nc_sist);	/* another one, just to be sure :) */
	OUTB (nc_scntl3, 4);	/* set pre-scaler to divide by 3 */
	OUTB (nc_stime1, 0);	/* disable general purpose timer */
	OUTB (nc_stime1, gen);	/* set to nominal delay of 1<<gen * 125us */
	while (!(INW(nc_sist) & GEN) && ms++ < 100000) {
		for (count = 0; count < 10; count ++)
			udelay(100);	/* count ms */
	}
	OUTB (nc_stime1, 0);	/* disable general purpose timer */
 	/*
 	 * set prescaler to divide by whatever 0 means
 	 * 0 ought to choose divide by 2, but appears
 	 * to set divide by 3.5 mode in my 53c810 ...
 	 */
 	OUTB (nc_scntl3, 0);

	if (bootverbose >= 2)
		printk ("%s: Delay (GEN=%d): %u msec\n", ncr_name(np), gen, ms);
  	/*
 	 * adjust for prescaler, and convert into KHz 
  	 */
	return ms ? ((1 << gen) * 4340) / ms : 0;
}

/*
 *	Get/probe NCR SCSI clock frequency
 */
static void __init ncr_getclock (struct ncb *np, int mult)
{
	unsigned char scntl3 = INB(nc_scntl3);
	unsigned char stest1 = INB(nc_stest1);
	unsigned f1;

	np->multiplier = 1;
	f1 = 40000;

	/*
	**	True with 875 or 895 with clock multiplier selected
	*/
	if (mult > 1 && (stest1 & (DBLEN+DBLSEL)) == DBLEN+DBLSEL) {
		if (bootverbose >= 2)
			printk ("%s: clock multiplier found\n", ncr_name(np));
		np->multiplier = mult;
	}

	/*
	**	If multiplier not found or scntl3 not 7,5,3,
	**	reset chip and get frequency from general purpose timer.
	**	Otherwise trust scntl3 BIOS setting.
	*/
	if (np->multiplier != mult || (scntl3 & 7) < 3 || !(scntl3 & 1)) {
		unsigned f2;

		ncr_chip_reset(np, 5);

		(void) ncrgetfreq (np, 11);	/* throw away first result */
		f1 = ncrgetfreq (np, 11);
		f2 = ncrgetfreq (np, 11);

		if(bootverbose)
			printk ("%s: NCR clock is %uKHz, %uKHz\n", ncr_name(np), f1, f2);

		if (f1 > f2) f1 = f2;		/* trust lower result	*/

		if	(f1 <	45000)		f1 =  40000;
		else if (f1 <	55000)		f1 =  50000;
		else				f1 =  80000;

		if (f1 < 80000 && mult > 1) {
			if (bootverbose >= 2)
				printk ("%s: clock multiplier assumed\n", ncr_name(np));
			np->multiplier	= mult;
		}
	} else {
		if	((scntl3 & 7) == 3)	f1 =  40000;
		else if	((scntl3 & 7) == 5)	f1 =  80000;
		else 				f1 = 160000;

		f1 /= np->multiplier;
	}

	/*
	**	Compute controller synchronous parameters.
	*/
	f1		*= np->multiplier;
	np->clock_khz	= f1;
}

/*===================== LINUX ENTRY POINTS SECTION ==========================*/

static int ncr53c8xx_slave_alloc(struct scsi_device *device)
{
	struct Scsi_Host *host = device->host;
	struct ncb *np = ((struct host_data *) host->hostdata)->ncb;
	struct tcb *tp = &np->target[device->id];
	tp->starget = device->sdev_target;

	return 0;
}

static int ncr53c8xx_slave_configure(struct scsi_device *device)
{
	struct Scsi_Host *host = device->host;
	struct ncb *np = ((struct host_data *) host->hostdata)->ncb;
	struct tcb *tp = &np->target[device->id];
	struct lcb *lp = tp->lp[device->lun];
	int numtags, depth_to_use;

	ncr_setup_lcb(np, device);

	/*
	**	Select queue depth from driver setup.
	**	Donnot use more than configured by user.
	**	Use at least 2.
	**	Donnot use more than our maximum.
	*/
	numtags = device_queue_depth(np->unit, device->id, device->lun);
	if (numtags > tp->usrtags)
		numtags = tp->usrtags;
	if (!device->tagged_supported)
		numtags = 1;
	depth_to_use = numtags;
	if (depth_to_use < 2)
		depth_to_use = 2;
	if (depth_to_use > MAX_TAGS)
		depth_to_use = MAX_TAGS;

	scsi_adjust_queue_depth(device,
				(device->tagged_supported ?
				 MSG_SIMPLE_TAG : 0),
				depth_to_use);

	/*
	**	Since the queue depth is not tunable under Linux,
	**	we need to know this value in order not to 
	**	announce stupid things to user.
	**
	**	XXX(hch): As of Linux 2.6 it certainly _is_ tunable..
	**		  In fact we just tuned it, or did I miss
	**		  something important? :)
	*/
	if (lp) {
		lp->numtags = lp->maxtags = numtags;
		lp->scdev_depth = depth_to_use;
	}
	ncr_setup_tags (np, device);

#ifdef DEBUG_NCR53C8XX
	printk("ncr53c8xx_select_queue_depth: host=%d, id=%d, lun=%d, depth=%d\n",
	       np->unit, device->id, device->lun, depth_to_use);
#endif

	if (spi_support_sync(device->sdev_target) &&
	    !spi_initial_dv(device->sdev_target))
		spi_dv_device(device);
	return 0;
}

static int ncr53c8xx_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
{
     struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
     unsigned long flags;
     int sts;

#ifdef DEBUG_NCR53C8XX
printk("ncr53c8xx_queue_command\n");
#endif

     cmd->scsi_done     = done;
     cmd->host_scribble = NULL;
     cmd->__data_mapped = 0;
     cmd->__data_mapping = 0;

     spin_lock_irqsave(&np->smp_lock, flags);

     if ((sts = ncr_queue_command(np, cmd)) != DID_OK) {
	  cmd->result = ScsiResult(sts, 0);
#ifdef DEBUG_NCR53C8XX
printk("ncr53c8xx : command not queued - result=%d\n", sts);
#endif
     }
#ifdef DEBUG_NCR53C8XX
     else
printk("ncr53c8xx : command successfully queued\n");
#endif

     spin_unlock_irqrestore(&np->smp_lock, flags);

     if (sts != DID_OK) {
          unmap_scsi_data(np, cmd);
          done(cmd);
	  sts = 0;
     }

     return sts;
}

irqreturn_t ncr53c8xx_intr(int irq, void *dev_id)
{
     unsigned long flags;
     struct Scsi_Host *shost = (struct Scsi_Host *)dev_id;
     struct host_data *host_data = (struct host_data *)shost->hostdata;
     struct ncb *np = host_data->ncb;
     struct scsi_cmnd *done_list;

#ifdef DEBUG_NCR53C8XX
     printk("ncr53c8xx : interrupt received\n");
#endif

     if (DEBUG_FLAGS & DEBUG_TINY) printk ("[");

     spin_lock_irqsave(&np->smp_lock, flags);
     ncr_exception(np);
     done_list     = np->done_list;
     np->done_list = NULL;
     spin_unlock_irqrestore(&np->smp_lock, flags);

     if (DEBUG_FLAGS & DEBUG_TINY) printk ("]\n");

     if (done_list)
	     ncr_flush_done_cmds(done_list);
     return IRQ_HANDLED;
}

static void ncr53c8xx_timeout(unsigned long npref)
{
	struct ncb *np = (struct ncb *) npref;
	unsigned long flags;
	struct scsi_cmnd *done_list;

	spin_lock_irqsave(&np->smp_lock, flags);
	ncr_timeout(np);
	done_list     = np->done_list;
	np->done_list = NULL;
	spin_unlock_irqrestore(&np->smp_lock, flags);

	if (done_list)
		ncr_flush_done_cmds(done_list);
}

static int ncr53c8xx_bus_reset(struct scsi_cmnd *cmd)
{
	struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
	int sts;
	unsigned long flags;
	struct scsi_cmnd *done_list;

	/*
	 * If the mid-level driver told us reset is synchronous, it seems 
	 * that we must call the done() callback for the involved command, 
	 * even if this command was not queued to the low-level driver, 
	 * before returning SUCCESS.
	 */

	spin_lock_irqsave(&np->smp_lock, flags);
	sts = ncr_reset_bus(np, cmd, 1);

	done_list     = np->done_list;
	np->done_list = NULL;
	spin_unlock_irqrestore(&np->smp_lock, flags);

	ncr_flush_done_cmds(done_list);

	return sts;
}

#if 0 /* unused and broken */
static int ncr53c8xx_abort(struct scsi_cmnd *cmd)
{
	struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
	int sts;
	unsigned long flags;
	struct scsi_cmnd *done_list;

	printk("ncr53c8xx_abort: command pid %lu\n", cmd->serial_number);

	NCR_LOCK_NCB(np, flags);

	sts = ncr_abort_command(np, cmd);
out:
	done_list     = np->done_list;
	np->done_list = NULL;
	NCR_UNLOCK_NCB(np, flags);

	ncr_flush_done_cmds(done_list);

	return sts;
}
#endif


/*
**	Scsi command waiting list management.
**
**	It may happen that we cannot insert a scsi command into the start queue,
**	in the following circumstances.
** 		Too few preallocated ccb(s), 
**		maxtags < cmd_per_lun of the Linux host control block,
**		etc...
**	Such scsi commands are inserted into a waiting list.
**	When a scsi command complete, we try to requeue the commands of the
**	waiting list.
*/

#define next_wcmd host_scribble

static void insert_into_waiting_list(struct ncb *np, struct scsi_cmnd *cmd)
{
	struct scsi_cmnd *wcmd;

#ifdef DEBUG_WAITING_LIST
	printk("%s: cmd %lx inserted into waiting list\n", ncr_name(np), (u_long) cmd);
#endif
	cmd->next_wcmd = NULL;
	if (!(wcmd = np->waiting_list)) np->waiting_list = cmd;
	else {
		while (wcmd->next_wcmd)
			wcmd = (struct scsi_cmnd *) wcmd->next_wcmd;
		wcmd->next_wcmd = (char *) cmd;
	}
}

static struct scsi_cmnd *retrieve_from_waiting_list(int to_remove, struct ncb *np, struct scsi_cmnd *cmd)
{
	struct scsi_cmnd **pcmd = &np->waiting_list;

	while (*pcmd) {
		if (cmd == *pcmd) {
			if (to_remove) {
				*pcmd = (struct scsi_cmnd *) cmd->next_wcmd;
				cmd->next_wcmd = NULL;
			}
#ifdef DEBUG_WAITING_LIST
	printk("%s: cmd %lx retrieved from waiting list\n", ncr_name(np), (u_long) cmd);
#endif
			return cmd;
		}
		pcmd = (struct scsi_cmnd **) &(*pcmd)->next_wcmd;
	}
	return NULL;
}

static void process_waiting_list(struct ncb *np, int sts)
{
	struct scsi_cmnd *waiting_list, *wcmd;

	waiting_list = np->waiting_list;
	np->waiting_list = NULL;

#ifdef DEBUG_WAITING_LIST
	if (waiting_list) printk("%s: waiting_list=%lx processing sts=%d\n", ncr_name(np), (u_long) waiting_list, sts);
#endif
	while ((wcmd = waiting_list) != NULL) {
		waiting_list = (struct scsi_cmnd *) wcmd->next_wcmd;
		wcmd->next_wcmd = NULL;
		if (sts == DID_OK) {
#ifdef DEBUG_WAITING_LIST
	printk("%s: cmd %lx trying to requeue\n", ncr_name(np), (u_long) wcmd);
#endif
			sts = ncr_queue_command(np, wcmd);
		}
		if (sts != DID_OK) {
#ifdef DEBUG_WAITING_LIST
	printk("%s: cmd %lx done forced sts=%d\n", ncr_name(np), (u_long) wcmd, sts);
#endif
			wcmd->result = ScsiResult(sts, 0);
			ncr_queue_done_cmd(np, wcmd);
		}
	}
}

#undef next_wcmd

static ssize_t show_ncr53c8xx_revision(struct device *dev,
				       struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *host = class_to_shost(dev);
	struct host_data *host_data = (struct host_data *)host->hostdata;
  
	return snprintf(buf, 20, "0x%x\n", host_data->ncb->revision_id);
}
  
static struct device_attribute ncr53c8xx_revision_attr = {
	.attr	= { .name = "revision", .mode = S_IRUGO, },
	.show	= show_ncr53c8xx_revision,
};
  
static struct device_attribute *ncr53c8xx_host_attrs[] = {
	&ncr53c8xx_revision_attr,
	NULL
};

/*==========================================================
**
**	Boot command line.
**
**==========================================================
*/
#ifdef	MODULE
char *ncr53c8xx;	/* command line passed by insmod */
module_param(ncr53c8xx, charp, 0);
#endif

#ifndef MODULE
static int __init ncr53c8xx_setup(char *str)
{
	return sym53c8xx__setup(str);
}

__setup("ncr53c8xx=", ncr53c8xx_setup);
#endif


/*
 *	Host attach and initialisations.
 *
 *	Allocate host data and ncb structure.
 *	Request IO region and remap MMIO region.
 *	Do chip initialization.
 *	If all is OK, install interrupt handling and
 *	start the timer daemon.
 */
struct Scsi_Host * __init ncr_attach(struct scsi_host_template *tpnt,
					int unit, struct ncr_device *device)
{
	struct host_data *host_data;
	struct ncb *np = NULL;
	struct Scsi_Host *instance = NULL;
	u_long flags = 0;
	int i;

	if (!tpnt->name)
		tpnt->name	= SCSI_NCR_DRIVER_NAME;
	if (!tpnt->shost_attrs)
		tpnt->shost_attrs = ncr53c8xx_host_attrs;

	tpnt->queuecommand	= ncr53c8xx_queue_command;
	tpnt->slave_configure	= ncr53c8xx_slave_configure;
	tpnt->slave_alloc	= ncr53c8xx_slave_alloc;
	tpnt->eh_bus_reset_handler = ncr53c8xx_bus_reset;
	tpnt->can_queue		= SCSI_NCR_CAN_QUEUE;
	tpnt->this_id		= 7;
	tpnt->sg_tablesize	= SCSI_NCR_SG_TABLESIZE;
	tpnt->cmd_per_lun	= SCSI_NCR_CMD_PER_LUN;
	tpnt->use_clustering	= ENABLE_CLUSTERING;

	if (device->differential)
		driver_setup.diff_support = device->differential;

	printk(KERN_INFO "ncr53c720-%d: rev 0x%x irq %d\n",
		unit, device->chip.revision_id, device->slot.irq);

	instance = scsi_host_alloc(tpnt, sizeof(*host_data));
	if (!instance)
	        goto attach_error;
	host_data = (struct host_data *) instance->hostdata;

	np = __m_calloc_dma(device->dev, sizeof(struct ncb), "NCB");
	if (!np)
		goto attach_error;
	spin_lock_init(&np->smp_lock);
	np->dev = device->dev;
	np->p_ncb = vtobus(np);
	host_data->ncb = np;

	np->ccb = m_calloc_dma(sizeof(struct ccb), "CCB");
	if (!np->ccb)
		goto attach_error;

	/* Store input information in the host data structure.  */
	np->unit	= unit;
	np->verbose	= driver_setup.verbose;
	sprintf(np->inst_name, "ncr53c720-%d", np->unit);
	np->revision_id	= device->chip.revision_id;
	np->features	= device->chip.features;
	np->clock_divn	= device->chip.nr_divisor;
	np->maxoffs	= device->chip.offset_max;
	np->maxburst	= device->chip.burst_max;
	np->myaddr	= device->host_id;

	/* Allocate SCRIPTS areas.  */
	np->script0 = m_calloc_dma(sizeof(struct script), "SCRIPT");
	if (!np->script0)
		goto attach_error;
	np->scripth0 = m_calloc_dma(sizeof(struct scripth), "SCRIPTH");
	if (!np->scripth0)
		goto attach_error;

	init_timer(&np->timer);
	np->timer.data     = (unsigned long) np;
	np->timer.function = ncr53c8xx_timeout;

	/* Try to map the controller chip to virtual and physical memory. */

	np->paddr	= device->slot.base;
	np->paddr2	= (np->features & FE_RAM) ? device->slot.base_2 : 0;

	if (device->slot.base_v)
		np->vaddr = device->slot.base_v;
	else
		np->vaddr = ioremap(device->slot.base_c, 128);

	if (!np->vaddr) {
		printk(KERN_ERR
			"%s: can't map memory mapped IO region\n",ncr_name(np));
		goto attach_error;
	} else {
		if (bootverbose > 1)
			printk(KERN_INFO
				"%s: using memory mapped IO at virtual address 0x%lx\n", ncr_name(np), (u_long) np->vaddr);
	}

	/* Make the controller's registers available.  Now the INB INW INL
	 * OUTB OUTW OUTL macros can be used safely.
	 */

	np->reg = (struct ncr_reg __iomem *)np->vaddr;

	/* Do chip dependent initialization.  */
	ncr_prepare_setting(np);

	if (np->paddr2 && sizeof(struct script) > 4096) {
		np->paddr2 = 0;
		printk(KERN_WARNING "%s: script too large, NOT using on chip RAM.\n",
			ncr_name(np));
	}

	instance->max_channel	= 0;
	instance->this_id       = np->myaddr;
	instance->max_id	= np->maxwide ? 16 : 8;
	instance->max_lun	= SCSI_NCR_MAX_LUN;
	instance->base		= (unsigned long) np->reg;
	instance->irq		= device->slot.irq;
	instance->unique_id	= device->slot.base;
	instance->dma_channel	= 0;
	instance->cmd_per_lun	= MAX_TAGS;
	instance->can_queue	= (MAX_START-4);
	/* This can happen if you forget to call ncr53c8xx_init from
	 * your module_init */
	BUG_ON(!ncr53c8xx_transport_template);
	instance->transportt	= ncr53c8xx_transport_template;

	/* Patch script to physical addresses */
	ncr_script_fill(&script0, &scripth0);

	np->scripth	= np->scripth0;
	np->p_scripth	= vtobus(np->scripth);
	np->p_script	= (np->paddr2) ?  np->paddr2 : vtobus(np->script0);

	ncr_script_copy_and_bind(np, (ncrcmd *) &script0,
			(ncrcmd *) np->script0, sizeof(struct script));
	ncr_script_copy_and_bind(np, (ncrcmd *) &scripth0,
			(ncrcmd *) np->scripth0, sizeof(struct scripth));
	np->ccb->p_ccb	= vtobus (np->ccb);

	/* Patch the script for LED support.  */

	if (np->features & FE_LED0) {
		np->script0->idle[0]  =
				cpu_to_scr(SCR_REG_REG(gpreg, SCR_OR,  0x01));
		np->script0->reselected[0] =
				cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
		np->script0->start[0] =
				cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
	}

	/*
	 * Look for the target control block of this nexus.
	 * For i = 0 to 3
	 *   JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
	 */
	for (i = 0 ; i < 4 ; i++) {
		np->jump_tcb[i].l_cmd   =
				cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
		np->jump_tcb[i].l_paddr =
				cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_target));
	}

	ncr_chip_reset(np, 100);

	/* Now check the cache handling of the chipset.  */

	if (ncr_snooptest(np)) {
		printk(KERN_ERR "CACHE INCORRECTLY CONFIGURED.\n");
		goto attach_error;
	}

	/* Install the interrupt handler.  */
	np->irq = device->slot.irq;

	/* Initialize the fixed part of the default ccb.  */
	ncr_init_ccb(np, np->ccb);

	/*
	 * After SCSI devices have been opened, we cannot reset the bus
	 * safely, so we do it here.  Interrupt handler does the real work.
	 * Process the reset exception if interrupts are not enabled yet.
	 * Then enable disconnects.
	 */
	spin_lock_irqsave(&np->smp_lock, flags);
	if (ncr_reset_scsi_bus(np, 0, driver_setup.settle_delay) != 0) {
		printk(KERN_ERR "%s: FATAL ERROR: CHECK SCSI BUS - CABLES, TERMINATION, DEVICE POWER etc.!\n", ncr_name(np));

		spin_unlock_irqrestore(&np->smp_lock, flags);
		goto attach_error;
	}
	ncr_exception(np);

	np->disc = 1;

	/*
	 * The middle-level SCSI driver does not wait for devices to settle.
	 * Wait synchronously if more than 2 seconds.
	 */
	if (driver_setup.settle_delay > 2) {
		printk(KERN_INFO "%s: waiting %d seconds for scsi devices to settle...\n",
			ncr_name(np), driver_setup.settle_delay);
		mdelay(1000 * driver_setup.settle_delay);
	}

	/* start the timeout daemon */
	np->lasttime=0;
	ncr_timeout (np);

	/* use SIMPLE TAG messages by default */
#ifdef SCSI_NCR_ALWAYS_SIMPLE_TAG
	np->order = SIMPLE_QUEUE_TAG;
#endif

	spin_unlock_irqrestore(&np->smp_lock, flags);

	return instance;

 attach_error:
	if (!instance)
		return NULL;
	printk(KERN_INFO "%s: detaching...\n", ncr_name(np));
	if (!np)
		goto unregister;
	if (np->scripth0)
		m_free_dma(np->scripth0, sizeof(struct scripth), "SCRIPTH");
	if (np->script0)
		m_free_dma(np->script0, sizeof(struct script), "SCRIPT");
	if (np->ccb)
		m_free_dma(np->ccb, sizeof(struct ccb), "CCB");
	m_free_dma(np, sizeof(struct ncb), "NCB");
	host_data->ncb = NULL;

 unregister:
	scsi_host_put(instance);

	return NULL;
}


void ncr53c8xx_release(struct Scsi_Host *host)
{
	struct host_data *host_data = shost_priv(host);
#ifdef DEBUG_NCR53C8XX
	printk("ncr53c8xx: release\n");
#endif
	if (host_data->ncb)
		ncr_detach(host_data->ncb);
	scsi_host_put(host);
}

static void ncr53c8xx_set_period(struct scsi_target *starget, int period)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
	struct tcb *tp = &np->target[starget->id];

	if (period > np->maxsync)
		period = np->maxsync;
	else if (period < np->minsync)
		period = np->minsync;

	tp->usrsync = period;

	ncr_negotiate(np, tp);
}

static void ncr53c8xx_set_offset(struct scsi_target *starget, int offset)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
	struct tcb *tp = &np->target[starget->id];

	if (offset > np->maxoffs)
		offset = np->maxoffs;
	else if (offset < 0)
		offset = 0;

	tp->maxoffs = offset;

	ncr_negotiate(np, tp);
}

static void ncr53c8xx_set_width(struct scsi_target *starget, int width)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
	struct tcb *tp = &np->target[starget->id];

	if (width > np->maxwide)
		width = np->maxwide;
	else if (width < 0)
		width = 0;

	tp->usrwide = width;

	ncr_negotiate(np, tp);
}

static void ncr53c8xx_get_signalling(struct Scsi_Host *shost)
{
	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
	enum spi_signal_type type;

	switch (np->scsi_mode) {
	case SMODE_SE:
		type = SPI_SIGNAL_SE;
		break;
	case SMODE_HVD:
		type = SPI_SIGNAL_HVD;
		break;
	default:
		type = SPI_SIGNAL_UNKNOWN;
		break;
	}
	spi_signalling(shost) = type;
}

static struct spi_function_template ncr53c8xx_transport_functions =  {
	.set_period	= ncr53c8xx_set_period,
	.show_period	= 1,
	.set_offset	= ncr53c8xx_set_offset,
	.show_offset	= 1,
	.set_width	= ncr53c8xx_set_width,
	.show_width	= 1,
	.get_signalling	= ncr53c8xx_get_signalling,
};

int __init ncr53c8xx_init(void)
{
	ncr53c8xx_transport_template = spi_attach_transport(&ncr53c8xx_transport_functions);
	if (!ncr53c8xx_transport_template)
		return -ENODEV;
	return 0;
}

void ncr53c8xx_exit(void)
{
	spi_release_transport(ncr53c8xx_transport_template);
}