summaryrefslogtreecommitdiffstats
path: root/drivers/net/wan/fsl_ucc_hdlc.c
blob: a08f04c3f64410c9ca8d78ff62802ac1c417be40 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
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
/* Freescale QUICC Engine HDLC Device Driver
 *
 * Copyright 2016 Freescale Semiconductor Inc.
 *
 * 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.
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/hdlc.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <soc/fsl/qe/qe_tdm.h>
#include <uapi/linux/if_arp.h>

#include "fsl_ucc_hdlc.h"

#define DRV_DESC "Freescale QE UCC HDLC Driver"
#define DRV_NAME "ucc_hdlc"

#define TDM_PPPOHT_SLIC_MAXIN
#define RX_BD_ERRORS (R_CD_S | R_OV_S | R_CR_S | R_AB_S | R_NO_S | R_LG_S)

static struct ucc_tdm_info utdm_primary_info = {
	.uf_info = {
		.tsa = 0,
		.cdp = 0,
		.cds = 1,
		.ctsp = 1,
		.ctss = 1,
		.revd = 0,
		.urfs = 256,
		.utfs = 256,
		.urfet = 128,
		.urfset = 192,
		.utfet = 128,
		.utftt = 0x40,
		.ufpt = 256,
		.mode = UCC_FAST_PROTOCOL_MODE_HDLC,
		.ttx_trx = UCC_FAST_GUMR_TRANSPARENT_TTX_TRX_NORMAL,
		.tenc = UCC_FAST_TX_ENCODING_NRZ,
		.renc = UCC_FAST_RX_ENCODING_NRZ,
		.tcrc = UCC_FAST_16_BIT_CRC,
		.synl = UCC_FAST_SYNC_LEN_NOT_USED,
	},

	.si_info = {
#ifdef TDM_PPPOHT_SLIC_MAXIN
		.simr_rfsd = 1,
		.simr_tfsd = 2,
#else
		.simr_rfsd = 0,
		.simr_tfsd = 0,
#endif
		.simr_crt = 0,
		.simr_sl = 0,
		.simr_ce = 1,
		.simr_fe = 1,
		.simr_gm = 0,
	},
};

static struct ucc_tdm_info utdm_info[MAX_HDLC_NUM];

static int uhdlc_init(struct ucc_hdlc_private *priv)
{
	struct ucc_tdm_info *ut_info;
	struct ucc_fast_info *uf_info;
	u32 cecr_subblock;
	u16 bd_status;
	int ret, i;
	void *bd_buffer;
	dma_addr_t bd_dma_addr;
	u32 riptr;
	u32 tiptr;
	u32 gumr;

	ut_info = priv->ut_info;
	uf_info = &ut_info->uf_info;

	if (priv->tsa) {
		uf_info->tsa = 1;
		uf_info->ctsp = 1;
		uf_info->cds = 1;
		uf_info->ctss = 1;
	} else {
		uf_info->cds = 0;
		uf_info->ctsp = 0;
		uf_info->ctss = 0;
	}

	/* This sets HPM register in CMXUCR register which configures a
	 * open drain connected HDLC bus
	 */
	if (priv->hdlc_bus)
		uf_info->brkpt_support = 1;

	uf_info->uccm_mask = ((UCC_HDLC_UCCE_RXB | UCC_HDLC_UCCE_RXF |
				UCC_HDLC_UCCE_TXB) << 16);

	ret = ucc_fast_init(uf_info, &priv->uccf);
	if (ret) {
		dev_err(priv->dev, "Failed to init uccf.");
		return ret;
	}

	priv->uf_regs = priv->uccf->uf_regs;
	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);

	/* Loopback mode */
	if (priv->loopback) {
		dev_info(priv->dev, "Loopback Mode\n");
		/* use the same clock when work in loopback */
		qe_setbrg(ut_info->uf_info.rx_clock, 20000000, 1);

		gumr = ioread32be(&priv->uf_regs->gumr);
		gumr |= (UCC_FAST_GUMR_LOOPBACK | UCC_FAST_GUMR_CDS |
			 UCC_FAST_GUMR_TCI);
		gumr &= ~(UCC_FAST_GUMR_CTSP | UCC_FAST_GUMR_RSYN);
		iowrite32be(gumr, &priv->uf_regs->gumr);
	}

	/* Initialize SI */
	if (priv->tsa)
		ucc_tdm_init(priv->utdm, priv->ut_info);

	/* Write to QE CECR, UCCx channel to Stop Transmission */
	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
	ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
			   QE_CR_PROTOCOL_UNSPECIFIED, 0);

	/* Set UPSMR normal mode (need fixed)*/
	iowrite32be(0, &priv->uf_regs->upsmr);

	/* hdlc_bus mode */
	if (priv->hdlc_bus) {
		u32 upsmr;

		dev_info(priv->dev, "HDLC bus Mode\n");
		upsmr = ioread32be(&priv->uf_regs->upsmr);

		/* bus mode and retransmit enable, with collision window
		 * set to 8 bytes
		 */
		upsmr |= UCC_HDLC_UPSMR_RTE | UCC_HDLC_UPSMR_BUS |
				UCC_HDLC_UPSMR_CW8;
		iowrite32be(upsmr, &priv->uf_regs->upsmr);

		/* explicitly disable CDS & CTSP */
		gumr = ioread32be(&priv->uf_regs->gumr);
		gumr &= ~(UCC_FAST_GUMR_CDS | UCC_FAST_GUMR_CTSP);
		/* set automatic sync to explicitly ignore CD signal */
		gumr |= UCC_FAST_GUMR_SYNL_AUTO;
		iowrite32be(gumr, &priv->uf_regs->gumr);
	}

	priv->rx_ring_size = RX_BD_RING_LEN;
	priv->tx_ring_size = TX_BD_RING_LEN;
	/* Alloc Rx BD */
	priv->rx_bd_base = dma_alloc_coherent(priv->dev,
			RX_BD_RING_LEN * sizeof(struct qe_bd),
			&priv->dma_rx_bd, GFP_KERNEL);

	if (!priv->rx_bd_base) {
		dev_err(priv->dev, "Cannot allocate MURAM memory for RxBDs\n");
		ret = -ENOMEM;
		goto free_uccf;
	}

	/* Alloc Tx BD */
	priv->tx_bd_base = dma_alloc_coherent(priv->dev,
			TX_BD_RING_LEN * sizeof(struct qe_bd),
			&priv->dma_tx_bd, GFP_KERNEL);

	if (!priv->tx_bd_base) {
		dev_err(priv->dev, "Cannot allocate MURAM memory for TxBDs\n");
		ret = -ENOMEM;
		goto free_rx_bd;
	}

	/* Alloc parameter ram for ucc hdlc */
	priv->ucc_pram_offset = qe_muram_alloc(sizeof(struct ucc_hdlc_param),
				ALIGNMENT_OF_UCC_HDLC_PRAM);

	if (IS_ERR_VALUE(priv->ucc_pram_offset)) {
		dev_err(priv->dev, "Can not allocate MURAM for hdlc parameter.\n");
		ret = -ENOMEM;
		goto free_tx_bd;
	}

	priv->rx_skbuff = kcalloc(priv->rx_ring_size,
				  sizeof(*priv->rx_skbuff),
				  GFP_KERNEL);
	if (!priv->rx_skbuff)
		goto free_ucc_pram;

	priv->tx_skbuff = kcalloc(priv->tx_ring_size,
				  sizeof(*priv->tx_skbuff),
				  GFP_KERNEL);
	if (!priv->tx_skbuff)
		goto free_rx_skbuff;

	priv->skb_curtx = 0;
	priv->skb_dirtytx = 0;
	priv->curtx_bd = priv->tx_bd_base;
	priv->dirty_tx = priv->tx_bd_base;
	priv->currx_bd = priv->rx_bd_base;
	priv->currx_bdnum = 0;

	/* init parameter base */
	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
	ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
			   QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);

	priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
					qe_muram_addr(priv->ucc_pram_offset);

	/* Zero out parameter ram */
	memset_io(priv->ucc_pram, 0, sizeof(struct ucc_hdlc_param));

	/* Alloc riptr, tiptr */
	riptr = qe_muram_alloc(32, 32);
	if (IS_ERR_VALUE(riptr)) {
		dev_err(priv->dev, "Cannot allocate MURAM mem for Receive internal temp data pointer\n");
		ret = -ENOMEM;
		goto free_tx_skbuff;
	}

	tiptr = qe_muram_alloc(32, 32);
	if (IS_ERR_VALUE(tiptr)) {
		dev_err(priv->dev, "Cannot allocate MURAM mem for Transmit internal temp data pointer\n");
		ret = -ENOMEM;
		goto free_riptr;
	}

	/* Set RIPTR, TIPTR */
	iowrite16be(riptr, &priv->ucc_pram->riptr);
	iowrite16be(tiptr, &priv->ucc_pram->tiptr);

	/* Set MRBLR */
	iowrite16be(MAX_RX_BUF_LENGTH, &priv->ucc_pram->mrblr);

	/* Set RBASE, TBASE */
	iowrite32be(priv->dma_rx_bd, &priv->ucc_pram->rbase);
	iowrite32be(priv->dma_tx_bd, &priv->ucc_pram->tbase);

	/* Set RSTATE, TSTATE */
	iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->rstate);
	iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->tstate);

	/* Set C_MASK, C_PRES for 16bit CRC */
	iowrite32be(CRC_16BIT_MASK, &priv->ucc_pram->c_mask);
	iowrite32be(CRC_16BIT_PRES, &priv->ucc_pram->c_pres);

	iowrite16be(MAX_FRAME_LENGTH, &priv->ucc_pram->mflr);
	iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfthr);
	iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfcnt);
	iowrite16be(priv->hmask, &priv->ucc_pram->hmask);
	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr1);
	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr2);
	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr3);
	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr4);

	/* Get BD buffer */
	bd_buffer = dma_alloc_coherent(priv->dev,
				       (RX_BD_RING_LEN + TX_BD_RING_LEN) * MAX_RX_BUF_LENGTH,
				       &bd_dma_addr, GFP_KERNEL);

	if (!bd_buffer) {
		dev_err(priv->dev, "Could not allocate buffer descriptors\n");
		ret = -ENOMEM;
		goto free_tiptr;
	}

	priv->rx_buffer = bd_buffer;
	priv->tx_buffer = bd_buffer + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;

	priv->dma_rx_addr = bd_dma_addr;
	priv->dma_tx_addr = bd_dma_addr + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;

	for (i = 0; i < RX_BD_RING_LEN; i++) {
		if (i < (RX_BD_RING_LEN - 1))
			bd_status = R_E_S | R_I_S;
		else
			bd_status = R_E_S | R_I_S | R_W_S;

		iowrite16be(bd_status, &priv->rx_bd_base[i].status);
		iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
			    &priv->rx_bd_base[i].buf);
	}

	for (i = 0; i < TX_BD_RING_LEN; i++) {
		if (i < (TX_BD_RING_LEN - 1))
			bd_status =  T_I_S | T_TC_S;
		else
			bd_status =  T_I_S | T_TC_S | T_W_S;

		iowrite16be(bd_status, &priv->tx_bd_base[i].status);
		iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
			    &priv->tx_bd_base[i].buf);
	}

	return 0;

free_tiptr:
	qe_muram_free(tiptr);
free_riptr:
	qe_muram_free(riptr);
free_tx_skbuff:
	kfree(priv->tx_skbuff);
free_rx_skbuff:
	kfree(priv->rx_skbuff);
free_ucc_pram:
	qe_muram_free(priv->ucc_pram_offset);
free_tx_bd:
	dma_free_coherent(priv->dev,
			  TX_BD_RING_LEN * sizeof(struct qe_bd),
			  priv->tx_bd_base, priv->dma_tx_bd);
free_rx_bd:
	dma_free_coherent(priv->dev,
			  RX_BD_RING_LEN * sizeof(struct qe_bd),
			  priv->rx_bd_base, priv->dma_rx_bd);
free_uccf:
	ucc_fast_free(priv->uccf);

	return ret;
}

static netdev_tx_t ucc_hdlc_tx(struct sk_buff *skb, struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)hdlc->priv;
	struct qe_bd __iomem *bd;
	u16 bd_status;
	unsigned long flags;
	u16 *proto_head;

	switch (dev->type) {
	case ARPHRD_RAWHDLC:
		if (skb_headroom(skb) < HDLC_HEAD_LEN) {
			dev->stats.tx_dropped++;
			dev_kfree_skb(skb);
			netdev_err(dev, "No enough space for hdlc head\n");
			return -ENOMEM;
		}

		skb_push(skb, HDLC_HEAD_LEN);

		proto_head = (u16 *)skb->data;
		*proto_head = htons(DEFAULT_HDLC_HEAD);

		dev->stats.tx_bytes += skb->len;
		break;

	case ARPHRD_PPP:
		proto_head = (u16 *)skb->data;
		if (*proto_head != htons(DEFAULT_PPP_HEAD)) {
			dev->stats.tx_dropped++;
			dev_kfree_skb(skb);
			netdev_err(dev, "Wrong ppp header\n");
			return -ENOMEM;
		}

		dev->stats.tx_bytes += skb->len;
		break;

	case ARPHRD_ETHER:
		dev->stats.tx_bytes += skb->len;
		break;

	default:
		dev->stats.tx_dropped++;
		dev_kfree_skb(skb);
		return -ENOMEM;
	}
	netdev_sent_queue(dev, skb->len);
	spin_lock_irqsave(&priv->lock, flags);

	/* Start from the next BD that should be filled */
	bd = priv->curtx_bd;
	bd_status = ioread16be(&bd->status);
	/* Save the skb pointer so we can free it later */
	priv->tx_skbuff[priv->skb_curtx] = skb;

	/* Update the current skb pointer (wrapping if this was the last) */
	priv->skb_curtx =
	    (priv->skb_curtx + 1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);

	/* copy skb data to tx buffer for sdma processing */
	memcpy(priv->tx_buffer + (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
	       skb->data, skb->len);

	/* set bd status and length */
	bd_status = (bd_status & T_W_S) | T_R_S | T_I_S | T_L_S | T_TC_S;

	iowrite16be(skb->len, &bd->length);
	iowrite16be(bd_status, &bd->status);

	/* Move to next BD in the ring */
	if (!(bd_status & T_W_S))
		bd += 1;
	else
		bd = priv->tx_bd_base;

	if (bd == priv->dirty_tx) {
		if (!netif_queue_stopped(dev))
			netif_stop_queue(dev);
	}

	priv->curtx_bd = bd;

	spin_unlock_irqrestore(&priv->lock, flags);

	return NETDEV_TX_OK;
}

static int hdlc_tx_restart(struct ucc_hdlc_private *priv)
{
	u32 cecr_subblock;

	cecr_subblock =
		ucc_fast_get_qe_cr_subblock(priv->ut_info->uf_info.ucc_num);

	qe_issue_cmd(QE_RESTART_TX, cecr_subblock,
		     QE_CR_PROTOCOL_UNSPECIFIED, 0);
	return 0;
}

static int hdlc_tx_done(struct ucc_hdlc_private *priv)
{
	/* Start from the next BD that should be filled */
	struct net_device *dev = priv->ndev;
	unsigned int bytes_sent = 0;
	int howmany = 0;
	struct qe_bd *bd;		/* BD pointer */
	u16 bd_status;
	int tx_restart = 0;

	bd = priv->dirty_tx;
	bd_status = ioread16be(&bd->status);

	/* Normal processing. */
	while ((bd_status & T_R_S) == 0) {
		struct sk_buff *skb;

		if (bd_status & T_UN_S) { /* Underrun */
			dev->stats.tx_fifo_errors++;
			tx_restart = 1;
		}
		if (bd_status & T_CT_S) { /* Carrier lost */
			dev->stats.tx_carrier_errors++;
			tx_restart = 1;
		}

		/* BD contains already transmitted buffer.   */
		/* Handle the transmitted buffer and release */
		/* the BD to be used with the current frame  */

		skb = priv->tx_skbuff[priv->skb_dirtytx];
		if (!skb)
			break;
		howmany++;
		bytes_sent += skb->len;
		dev->stats.tx_packets++;
		memset(priv->tx_buffer +
		       (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
		       0, skb->len);
		dev_consume_skb_irq(skb);

		priv->tx_skbuff[priv->skb_dirtytx] = NULL;
		priv->skb_dirtytx =
		    (priv->skb_dirtytx +
		     1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);

		/* We freed a buffer, so now we can restart transmission */
		if (netif_queue_stopped(dev))
			netif_wake_queue(dev);

		/* Advance the confirmation BD pointer */
		if (!(bd_status & T_W_S))
			bd += 1;
		else
			bd = priv->tx_bd_base;
		bd_status = ioread16be(&bd->status);
	}
	priv->dirty_tx = bd;

	if (tx_restart)
		hdlc_tx_restart(priv);

	netdev_completed_queue(dev, howmany, bytes_sent);
	return 0;
}

static int hdlc_rx_done(struct ucc_hdlc_private *priv, int rx_work_limit)
{
	struct net_device *dev = priv->ndev;
	struct sk_buff *skb = NULL;
	hdlc_device *hdlc = dev_to_hdlc(dev);
	struct qe_bd *bd;
	u16 bd_status;
	u16 length, howmany = 0;
	u8 *bdbuffer;

	bd = priv->currx_bd;
	bd_status = ioread16be(&bd->status);

	/* while there are received buffers and BD is full (~R_E) */
	while (!((bd_status & (R_E_S)) || (--rx_work_limit < 0))) {
		if (bd_status & (RX_BD_ERRORS)) {
			dev->stats.rx_errors++;

			if (bd_status & R_CD_S)
				dev->stats.collisions++;
			if (bd_status & R_OV_S)
				dev->stats.rx_fifo_errors++;
			if (bd_status & R_CR_S)
				dev->stats.rx_crc_errors++;
			if (bd_status & R_AB_S)
				dev->stats.rx_over_errors++;
			if (bd_status & R_NO_S)
				dev->stats.rx_frame_errors++;
			if (bd_status & R_LG_S)
				dev->stats.rx_length_errors++;

			goto recycle;
		}
		bdbuffer = priv->rx_buffer +
			(priv->currx_bdnum * MAX_RX_BUF_LENGTH);
		length = ioread16be(&bd->length);

		switch (dev->type) {
		case ARPHRD_RAWHDLC:
			bdbuffer += HDLC_HEAD_LEN;
			length -= (HDLC_HEAD_LEN + HDLC_CRC_SIZE);

			skb = dev_alloc_skb(length);
			if (!skb) {
				dev->stats.rx_dropped++;
				return -ENOMEM;
			}

			skb_put(skb, length);
			skb->len = length;
			skb->dev = dev;
			memcpy(skb->data, bdbuffer, length);
			break;

		case ARPHRD_PPP:
		case ARPHRD_ETHER:
			length -= HDLC_CRC_SIZE;

			skb = dev_alloc_skb(length);
			if (!skb) {
				dev->stats.rx_dropped++;
				return -ENOMEM;
			}

			skb_put(skb, length);
			skb->len = length;
			skb->dev = dev;
			memcpy(skb->data, bdbuffer, length);
			break;
		}

		dev->stats.rx_packets++;
		dev->stats.rx_bytes += skb->len;
		howmany++;
		if (hdlc->proto)
			skb->protocol = hdlc_type_trans(skb, dev);
		netif_receive_skb(skb);

recycle:
		iowrite16be((bd_status & R_W_S) | R_E_S | R_I_S, &bd->status);

		/* update to point at the next bd */
		if (bd_status & R_W_S) {
			priv->currx_bdnum = 0;
			bd = priv->rx_bd_base;
		} else {
			if (priv->currx_bdnum < (RX_BD_RING_LEN - 1))
				priv->currx_bdnum += 1;
			else
				priv->currx_bdnum = RX_BD_RING_LEN - 1;

			bd += 1;
		}

		bd_status = ioread16be(&bd->status);
	}

	priv->currx_bd = bd;
	return howmany;
}

static int ucc_hdlc_poll(struct napi_struct *napi, int budget)
{
	struct ucc_hdlc_private *priv = container_of(napi,
						     struct ucc_hdlc_private,
						     napi);
	int howmany;

	/* Tx event processing */
	spin_lock(&priv->lock);
	hdlc_tx_done(priv);
	spin_unlock(&priv->lock);

	howmany = 0;
	howmany += hdlc_rx_done(priv, budget - howmany);

	if (howmany < budget) {
		napi_complete_done(napi, howmany);
		qe_setbits32(priv->uccf->p_uccm,
			     (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS) << 16);
	}

	return howmany;
}

static irqreturn_t ucc_hdlc_irq_handler(int irq, void *dev_id)
{
	struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)dev_id;
	struct net_device *dev = priv->ndev;
	struct ucc_fast_private *uccf;
	struct ucc_tdm_info *ut_info;
	u32 ucce;
	u32 uccm;

	ut_info = priv->ut_info;
	uccf = priv->uccf;

	ucce = ioread32be(uccf->p_ucce);
	uccm = ioread32be(uccf->p_uccm);
	ucce &= uccm;
	iowrite32be(ucce, uccf->p_ucce);
	if (!ucce)
		return IRQ_NONE;

	if ((ucce >> 16) & (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)) {
		if (napi_schedule_prep(&priv->napi)) {
			uccm &= ~((UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)
				  << 16);
			iowrite32be(uccm, uccf->p_uccm);
			__napi_schedule(&priv->napi);
		}
	}

	/* Errors and other events */
	if (ucce >> 16 & UCC_HDLC_UCCE_BSY)
		dev->stats.rx_missed_errors++;
	if (ucce >> 16 & UCC_HDLC_UCCE_TXE)
		dev->stats.tx_errors++;

	return IRQ_HANDLED;
}

static int uhdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	const size_t size = sizeof(te1_settings);
	te1_settings line;
	struct ucc_hdlc_private *priv = netdev_priv(dev);

	if (cmd != SIOCWANDEV)
		return hdlc_ioctl(dev, ifr, cmd);

	switch (ifr->ifr_settings.type) {
	case IF_GET_IFACE:
		ifr->ifr_settings.type = IF_IFACE_E1;
		if (ifr->ifr_settings.size < size) {
			ifr->ifr_settings.size = size; /* data size wanted */
			return -ENOBUFS;
		}
		memset(&line, 0, sizeof(line));
		line.clock_type = priv->clocking;

		if (copy_to_user(ifr->ifr_settings.ifs_ifsu.sync, &line, size))
			return -EFAULT;
		return 0;

	default:
		return hdlc_ioctl(dev, ifr, cmd);
	}
}

static int uhdlc_open(struct net_device *dev)
{
	u32 cecr_subblock;
	hdlc_device *hdlc = dev_to_hdlc(dev);
	struct ucc_hdlc_private *priv = hdlc->priv;
	struct ucc_tdm *utdm = priv->utdm;

	if (priv->hdlc_busy != 1) {
		if (request_irq(priv->ut_info->uf_info.irq,
				ucc_hdlc_irq_handler, 0, "hdlc", priv))
			return -ENODEV;

		cecr_subblock = ucc_fast_get_qe_cr_subblock(
					priv->ut_info->uf_info.ucc_num);

		qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
			     QE_CR_PROTOCOL_UNSPECIFIED, 0);

		ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);

		/* Enable the TDM port */
		if (priv->tsa)
			utdm->si_regs->siglmr1_h |= (0x1 << utdm->tdm_port);

		priv->hdlc_busy = 1;
		netif_device_attach(priv->ndev);
		napi_enable(&priv->napi);
		netdev_reset_queue(dev);
		netif_start_queue(dev);
		hdlc_open(dev);
	}

	return 0;
}

static void uhdlc_memclean(struct ucc_hdlc_private *priv)
{
	qe_muram_free(priv->ucc_pram->riptr);
	qe_muram_free(priv->ucc_pram->tiptr);

	if (priv->rx_bd_base) {
		dma_free_coherent(priv->dev,
				  RX_BD_RING_LEN * sizeof(struct qe_bd),
				  priv->rx_bd_base, priv->dma_rx_bd);

		priv->rx_bd_base = NULL;
		priv->dma_rx_bd = 0;
	}

	if (priv->tx_bd_base) {
		dma_free_coherent(priv->dev,
				  TX_BD_RING_LEN * sizeof(struct qe_bd),
				  priv->tx_bd_base, priv->dma_tx_bd);

		priv->tx_bd_base = NULL;
		priv->dma_tx_bd = 0;
	}

	if (priv->ucc_pram) {
		qe_muram_free(priv->ucc_pram_offset);
		priv->ucc_pram = NULL;
		priv->ucc_pram_offset = 0;
	 }

	kfree(priv->rx_skbuff);
	priv->rx_skbuff = NULL;

	kfree(priv->tx_skbuff);
	priv->tx_skbuff = NULL;

	if (priv->uf_regs) {
		iounmap(priv->uf_regs);
		priv->uf_regs = NULL;
	}

	if (priv->uccf) {
		ucc_fast_free(priv->uccf);
		priv->uccf = NULL;
	}

	if (priv->rx_buffer) {
		dma_free_coherent(priv->dev,
				  RX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
				  priv->rx_buffer, priv->dma_rx_addr);
		priv->rx_buffer = NULL;
		priv->dma_rx_addr = 0;
	}

	if (priv->tx_buffer) {
		dma_free_coherent(priv->dev,
				  TX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
				  priv->tx_buffer, priv->dma_tx_addr);
		priv->tx_buffer = NULL;
		priv->dma_tx_addr = 0;
	}
}

static int uhdlc_close(struct net_device *dev)
{
	struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;
	struct ucc_tdm *utdm = priv->utdm;
	u32 cecr_subblock;

	napi_disable(&priv->napi);
	cecr_subblock = ucc_fast_get_qe_cr_subblock(
				priv->ut_info->uf_info.ucc_num);

	qe_issue_cmd(QE_GRACEFUL_STOP_TX, cecr_subblock,
		     (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
	qe_issue_cmd(QE_CLOSE_RX_BD, cecr_subblock,
		     (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);

	if (priv->tsa)
		utdm->si_regs->siglmr1_h &= ~(0x1 << utdm->tdm_port);

	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);

	free_irq(priv->ut_info->uf_info.irq, priv);
	netif_stop_queue(dev);
	netdev_reset_queue(dev);
	priv->hdlc_busy = 0;

	return 0;
}

static int ucc_hdlc_attach(struct net_device *dev, unsigned short encoding,
			   unsigned short parity)
{
	struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;

	if (encoding != ENCODING_NRZ &&
	    encoding != ENCODING_NRZI)
		return -EINVAL;

	if (parity != PARITY_NONE &&
	    parity != PARITY_CRC32_PR1_CCITT &&
	    parity != PARITY_CRC16_PR0_CCITT &&
	    parity != PARITY_CRC16_PR1_CCITT)
		return -EINVAL;

	priv->encoding = encoding;
	priv->parity = parity;

	return 0;
}

#ifdef CONFIG_PM
static void store_clk_config(struct ucc_hdlc_private *priv)
{
	struct qe_mux *qe_mux_reg = &qe_immr->qmx;

	/* store si clk */
	priv->cmxsi1cr_h = ioread32be(&qe_mux_reg->cmxsi1cr_h);
	priv->cmxsi1cr_l = ioread32be(&qe_mux_reg->cmxsi1cr_l);

	/* store si sync */
	priv->cmxsi1syr = ioread32be(&qe_mux_reg->cmxsi1syr);

	/* store ucc clk */
	memcpy_fromio(priv->cmxucr, qe_mux_reg->cmxucr, 4 * sizeof(u32));
}

static void resume_clk_config(struct ucc_hdlc_private *priv)
{
	struct qe_mux *qe_mux_reg = &qe_immr->qmx;

	memcpy_toio(qe_mux_reg->cmxucr, priv->cmxucr, 4 * sizeof(u32));

	iowrite32be(priv->cmxsi1cr_h, &qe_mux_reg->cmxsi1cr_h);
	iowrite32be(priv->cmxsi1cr_l, &qe_mux_reg->cmxsi1cr_l);

	iowrite32be(priv->cmxsi1syr, &qe_mux_reg->cmxsi1syr);
}

static int uhdlc_suspend(struct device *dev)
{
	struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
	struct ucc_tdm_info *ut_info;
	struct ucc_fast __iomem *uf_regs;

	if (!priv)
		return -EINVAL;

	if (!netif_running(priv->ndev))
		return 0;

	netif_device_detach(priv->ndev);
	napi_disable(&priv->napi);

	ut_info = priv->ut_info;
	uf_regs = priv->uf_regs;

	/* backup gumr guemr*/
	priv->gumr = ioread32be(&uf_regs->gumr);
	priv->guemr = ioread8(&uf_regs->guemr);

	priv->ucc_pram_bak = kmalloc(sizeof(*priv->ucc_pram_bak),
					GFP_KERNEL);
	if (!priv->ucc_pram_bak)
		return -ENOMEM;

	/* backup HDLC parameter */
	memcpy_fromio(priv->ucc_pram_bak, priv->ucc_pram,
		      sizeof(struct ucc_hdlc_param));

	/* store the clk configuration */
	store_clk_config(priv);

	/* save power */
	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);

	return 0;
}

static int uhdlc_resume(struct device *dev)
{
	struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
	struct ucc_tdm *utdm;
	struct ucc_tdm_info *ut_info;
	struct ucc_fast __iomem *uf_regs;
	struct ucc_fast_private *uccf;
	struct ucc_fast_info *uf_info;
	int ret, i;
	u32 cecr_subblock;
	u16 bd_status;

	if (!priv)
		return -EINVAL;

	if (!netif_running(priv->ndev))
		return 0;

	utdm = priv->utdm;
	ut_info = priv->ut_info;
	uf_info = &ut_info->uf_info;
	uf_regs = priv->uf_regs;
	uccf = priv->uccf;

	/* restore gumr guemr */
	iowrite8(priv->guemr, &uf_regs->guemr);
	iowrite32be(priv->gumr, &uf_regs->gumr);

	/* Set Virtual Fifo registers */
	iowrite16be(uf_info->urfs, &uf_regs->urfs);
	iowrite16be(uf_info->urfet, &uf_regs->urfet);
	iowrite16be(uf_info->urfset, &uf_regs->urfset);
	iowrite16be(uf_info->utfs, &uf_regs->utfs);
	iowrite16be(uf_info->utfet, &uf_regs->utfet);
	iowrite16be(uf_info->utftt, &uf_regs->utftt);
	/* utfb, urfb are offsets from MURAM base */
	iowrite32be(uccf->ucc_fast_tx_virtual_fifo_base_offset, &uf_regs->utfb);
	iowrite32be(uccf->ucc_fast_rx_virtual_fifo_base_offset, &uf_regs->urfb);

	/* Rx Tx and sync clock routing */
	resume_clk_config(priv);

	iowrite32be(uf_info->uccm_mask, &uf_regs->uccm);
	iowrite32be(0xffffffff, &uf_regs->ucce);

	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);

	/* rebuild SIRAM */
	if (priv->tsa)
		ucc_tdm_init(priv->utdm, priv->ut_info);

	/* Write to QE CECR, UCCx channel to Stop Transmission */
	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
	ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
			   (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);

	/* Set UPSMR normal mode */
	iowrite32be(0, &uf_regs->upsmr);

	/* init parameter base */
	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
	ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
			   QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);

	priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
				qe_muram_addr(priv->ucc_pram_offset);

	/* restore ucc parameter */
	memcpy_toio(priv->ucc_pram, priv->ucc_pram_bak,
		    sizeof(struct ucc_hdlc_param));
	kfree(priv->ucc_pram_bak);

	/* rebuild BD entry */
	for (i = 0; i < RX_BD_RING_LEN; i++) {
		if (i < (RX_BD_RING_LEN - 1))
			bd_status = R_E_S | R_I_S;
		else
			bd_status = R_E_S | R_I_S | R_W_S;

		iowrite16be(bd_status, &priv->rx_bd_base[i].status);
		iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
			    &priv->rx_bd_base[i].buf);
	}

	for (i = 0; i < TX_BD_RING_LEN; i++) {
		if (i < (TX_BD_RING_LEN - 1))
			bd_status =  T_I_S | T_TC_S;
		else
			bd_status =  T_I_S | T_TC_S | T_W_S;

		iowrite16be(bd_status, &priv->tx_bd_base[i].status);
		iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
			    &priv->tx_bd_base[i].buf);
	}

	/* if hdlc is busy enable TX and RX */
	if (priv->hdlc_busy == 1) {
		cecr_subblock = ucc_fast_get_qe_cr_subblock(
					priv->ut_info->uf_info.ucc_num);

		qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
			     (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);

		ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);

		/* Enable the TDM port */
		if (priv->tsa)
			utdm->si_regs->siglmr1_h |= (0x1 << utdm->tdm_port);
	}

	napi_enable(&priv->napi);
	netif_device_attach(priv->ndev);

	return 0;
}

static const struct dev_pm_ops uhdlc_pm_ops = {
	.suspend = uhdlc_suspend,
	.resume = uhdlc_resume,
	.freeze = uhdlc_suspend,
	.thaw = uhdlc_resume,
};

#define HDLC_PM_OPS (&uhdlc_pm_ops)

#else

#define HDLC_PM_OPS NULL

#endif
static void uhdlc_tx_timeout(struct net_device *ndev)
{
	netdev_err(ndev, "%s\n", __func__);
}

static const struct net_device_ops uhdlc_ops = {
	.ndo_open       = uhdlc_open,
	.ndo_stop       = uhdlc_close,
	.ndo_start_xmit = hdlc_start_xmit,
	.ndo_do_ioctl   = uhdlc_ioctl,
	.ndo_tx_timeout	= uhdlc_tx_timeout,
};

static int hdlc_map_iomem(char *name, int init_flag, void __iomem **ptr)
{
	struct device_node *np;
	struct platform_device *pdev;
	struct resource *res;
	static int siram_init_flag;
	int ret = 0;

	np = of_find_compatible_node(NULL, NULL, name);
	if (!np)
		return -EINVAL;

	pdev = of_find_device_by_node(np);
	if (!pdev) {
		pr_err("%pOFn: failed to lookup pdev\n", np);
		of_node_put(np);
		return -EINVAL;
	}

	of_node_put(np);
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -EINVAL;
		goto error_put_device;
	}
	*ptr = ioremap(res->start, resource_size(res));
	if (!*ptr) {
		ret = -ENOMEM;
		goto error_put_device;
	}

	/* We've remapped the addresses, and we don't need the device any
	 * more, so we should release it.
	 */
	put_device(&pdev->dev);

	if (init_flag && siram_init_flag == 0) {
		memset_io(*ptr, 0, resource_size(res));
		siram_init_flag = 1;
	}
	return  0;

error_put_device:
	put_device(&pdev->dev);

	return ret;
}

static int ucc_hdlc_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct ucc_hdlc_private *uhdlc_priv = NULL;
	struct ucc_tdm_info *ut_info;
	struct ucc_tdm *utdm = NULL;
	struct resource res;
	struct net_device *dev;
	hdlc_device *hdlc;
	int ucc_num;
	const char *sprop;
	int ret;
	u32 val;

	ret = of_property_read_u32_index(np, "cell-index", 0, &val);
	if (ret) {
		dev_err(&pdev->dev, "Invalid ucc property\n");
		return -ENODEV;
	}

	ucc_num = val - 1;
	if (ucc_num > (UCC_MAX_NUM - 1) || ucc_num < 0) {
		dev_err(&pdev->dev, ": Invalid UCC num\n");
		return -EINVAL;
	}

	memcpy(&utdm_info[ucc_num], &utdm_primary_info,
	       sizeof(utdm_primary_info));

	ut_info = &utdm_info[ucc_num];
	ut_info->uf_info.ucc_num = ucc_num;

	sprop = of_get_property(np, "rx-clock-name", NULL);
	if (sprop) {
		ut_info->uf_info.rx_clock = qe_clock_source(sprop);
		if ((ut_info->uf_info.rx_clock < QE_CLK_NONE) ||
		    (ut_info->uf_info.rx_clock > QE_CLK24)) {
			dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
			return -EINVAL;
		}
	} else {
		dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
		return -EINVAL;
	}

	sprop = of_get_property(np, "tx-clock-name", NULL);
	if (sprop) {
		ut_info->uf_info.tx_clock = qe_clock_source(sprop);
		if ((ut_info->uf_info.tx_clock < QE_CLK_NONE) ||
		    (ut_info->uf_info.tx_clock > QE_CLK24)) {
			dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
			return -EINVAL;
		}
	} else {
		dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
		return -EINVAL;
	}

	ret = of_address_to_resource(np, 0, &res);
	if (ret)
		return -EINVAL;

	ut_info->uf_info.regs = res.start;
	ut_info->uf_info.irq = irq_of_parse_and_map(np, 0);

	uhdlc_priv = kzalloc(sizeof(*uhdlc_priv), GFP_KERNEL);
	if (!uhdlc_priv) {
		return -ENOMEM;
	}

	dev_set_drvdata(&pdev->dev, uhdlc_priv);
	uhdlc_priv->dev = &pdev->dev;
	uhdlc_priv->ut_info = ut_info;

	if (of_get_property(np, "fsl,tdm-interface", NULL))
		uhdlc_priv->tsa = 1;

	if (of_get_property(np, "fsl,ucc-internal-loopback", NULL))
		uhdlc_priv->loopback = 1;

	if (of_get_property(np, "fsl,hdlc-bus", NULL))
		uhdlc_priv->hdlc_bus = 1;

	if (uhdlc_priv->tsa == 1) {
		utdm = kzalloc(sizeof(*utdm), GFP_KERNEL);
		if (!utdm) {
			ret = -ENOMEM;
			dev_err(&pdev->dev, "No mem to alloc ucc tdm data\n");
			goto free_uhdlc_priv;
		}
		uhdlc_priv->utdm = utdm;
		ret = ucc_of_parse_tdm(np, utdm, ut_info);
		if (ret)
			goto free_utdm;

		ret = hdlc_map_iomem("fsl,t1040-qe-si", 0,
				     (void __iomem **)&utdm->si_regs);
		if (ret)
			goto free_utdm;
		ret = hdlc_map_iomem("fsl,t1040-qe-siram", 1,
				     (void __iomem **)&utdm->siram);
		if (ret)
			goto unmap_si_regs;
	}

	if (of_property_read_u16(np, "fsl,hmask", &uhdlc_priv->hmask))
		uhdlc_priv->hmask = DEFAULT_ADDR_MASK;

	ret = uhdlc_init(uhdlc_priv);
	if (ret) {
		dev_err(&pdev->dev, "Failed to init uhdlc\n");
		goto undo_uhdlc_init;
	}

	dev = alloc_hdlcdev(uhdlc_priv);
	if (!dev) {
		ret = -ENOMEM;
		pr_err("ucc_hdlc: unable to allocate memory\n");
		goto undo_uhdlc_init;
	}

	uhdlc_priv->ndev = dev;
	hdlc = dev_to_hdlc(dev);
	dev->tx_queue_len = 16;
	dev->netdev_ops = &uhdlc_ops;
	dev->watchdog_timeo = 2 * HZ;
	hdlc->attach = ucc_hdlc_attach;
	hdlc->xmit = ucc_hdlc_tx;
	netif_napi_add(dev, &uhdlc_priv->napi, ucc_hdlc_poll, 32);
	if (register_hdlc_device(dev)) {
		ret = -ENOBUFS;
		pr_err("ucc_hdlc: unable to register hdlc device\n");
		goto free_dev;
	}

	return 0;

free_dev:
	free_netdev(dev);
undo_uhdlc_init:
	iounmap(utdm->siram);
unmap_si_regs:
	iounmap(utdm->si_regs);
free_utdm:
	if (uhdlc_priv->tsa)
		kfree(utdm);
free_uhdlc_priv:
	kfree(uhdlc_priv);
	return ret;
}

static int ucc_hdlc_remove(struct platform_device *pdev)
{
	struct ucc_hdlc_private *priv = dev_get_drvdata(&pdev->dev);

	uhdlc_memclean(priv);

	if (priv->utdm->si_regs) {
		iounmap(priv->utdm->si_regs);
		priv->utdm->si_regs = NULL;
	}

	if (priv->utdm->siram) {
		iounmap(priv->utdm->siram);
		priv->utdm->siram = NULL;
	}
	kfree(priv);

	dev_info(&pdev->dev, "UCC based hdlc module removed\n");

	return 0;
}

static const struct of_device_id fsl_ucc_hdlc_of_match[] = {
	{
	.compatible = "fsl,ucc-hdlc",
	},
	{},
};

MODULE_DEVICE_TABLE(of, fsl_ucc_hdlc_of_match);

static struct platform_driver ucc_hdlc_driver = {
	.probe	= ucc_hdlc_probe,
	.remove	= ucc_hdlc_remove,
	.driver	= {
		.name		= DRV_NAME,
		.pm		= HDLC_PM_OPS,
		.of_match_table	= fsl_ucc_hdlc_of_match,
	},
};

module_platform_driver(ucc_hdlc_driver);
MODULE_LICENSE("GPL");