summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpio-samsung.c
blob: 7c288ba4dc87fe0ea9e6274be22d7c7719752142 (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
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
/*
 * Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com/
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *      Ben Dooks <ben@simtec.co.uk>
 *      http://armlinux.simtec.co.uk/
 *
 * SAMSUNG - GPIOlib support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/of_address.h>

#include <asm/irq.h>

#include <mach/map.h>
#include <mach/regs-gpio.h>
#include <mach/gpio-samsung.h>

#include <plat/cpu.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
#include <plat/pm.h>

int samsung_gpio_setpull_updown(struct samsung_gpio_chip *chip,
				unsigned int off, samsung_gpio_pull_t pull)
{
	void __iomem *reg = chip->base + 0x08;
	int shift = off * 2;
	u32 pup;

	pup = __raw_readl(reg);
	pup &= ~(3 << shift);
	pup |= pull << shift;
	__raw_writel(pup, reg);

	return 0;
}

samsung_gpio_pull_t samsung_gpio_getpull_updown(struct samsung_gpio_chip *chip,
						unsigned int off)
{
	void __iomem *reg = chip->base + 0x08;
	int shift = off * 2;
	u32 pup = __raw_readl(reg);

	pup >>= shift;
	pup &= 0x3;

	return (__force samsung_gpio_pull_t)pup;
}

int s3c2443_gpio_setpull(struct samsung_gpio_chip *chip,
			 unsigned int off, samsung_gpio_pull_t pull)
{
	switch (pull) {
	case S3C_GPIO_PULL_NONE:
		pull = 0x01;
		break;
	case S3C_GPIO_PULL_UP:
		pull = 0x00;
		break;
	case S3C_GPIO_PULL_DOWN:
		pull = 0x02;
		break;
	}
	return samsung_gpio_setpull_updown(chip, off, pull);
}

samsung_gpio_pull_t s3c2443_gpio_getpull(struct samsung_gpio_chip *chip,
					 unsigned int off)
{
	samsung_gpio_pull_t pull;

	pull = samsung_gpio_getpull_updown(chip, off);

	switch (pull) {
	case 0x00:
		pull = S3C_GPIO_PULL_UP;
		break;
	case 0x01:
	case 0x03:
		pull = S3C_GPIO_PULL_NONE;
		break;
	case 0x02:
		pull = S3C_GPIO_PULL_DOWN;
		break;
	}

	return pull;
}

static int s3c24xx_gpio_setpull_1(struct samsung_gpio_chip *chip,
				  unsigned int off, samsung_gpio_pull_t pull,
				  samsung_gpio_pull_t updown)
{
	void __iomem *reg = chip->base + 0x08;
	u32 pup = __raw_readl(reg);

	if (pull == updown)
		pup &= ~(1 << off);
	else if (pull == S3C_GPIO_PULL_NONE)
		pup |= (1 << off);
	else
		return -EINVAL;

	__raw_writel(pup, reg);
	return 0;
}

static samsung_gpio_pull_t s3c24xx_gpio_getpull_1(struct samsung_gpio_chip *chip,
						  unsigned int off,
						  samsung_gpio_pull_t updown)
{
	void __iomem *reg = chip->base + 0x08;
	u32 pup = __raw_readl(reg);

	pup &= (1 << off);
	return pup ? S3C_GPIO_PULL_NONE : updown;
}

samsung_gpio_pull_t s3c24xx_gpio_getpull_1up(struct samsung_gpio_chip *chip,
					     unsigned int off)
{
	return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_UP);
}

int s3c24xx_gpio_setpull_1up(struct samsung_gpio_chip *chip,
			     unsigned int off, samsung_gpio_pull_t pull)
{
	return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_UP);
}

samsung_gpio_pull_t s3c24xx_gpio_getpull_1down(struct samsung_gpio_chip *chip,
					       unsigned int off)
{
	return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_DOWN);
}

int s3c24xx_gpio_setpull_1down(struct samsung_gpio_chip *chip,
			       unsigned int off, samsung_gpio_pull_t pull)
{
	return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_DOWN);
}

/*
 * samsung_gpio_setcfg_2bit - Samsung 2bit style GPIO configuration.
 * @chip: The gpio chip that is being configured.
 * @off: The offset for the GPIO being configured.
 * @cfg: The configuration value to set.
 *
 * This helper deal with the GPIO cases where the control register
 * has two bits of configuration per gpio, which have the following
 * functions:
 *	00 = input
 *	01 = output
 *	1x = special function
 */

static int samsung_gpio_setcfg_2bit(struct samsung_gpio_chip *chip,
				    unsigned int off, unsigned int cfg)
{
	void __iomem *reg = chip->base;
	unsigned int shift = off * 2;
	u32 con;

	if (samsung_gpio_is_cfg_special(cfg)) {
		cfg &= 0xf;
		if (cfg > 3)
			return -EINVAL;

		cfg <<= shift;
	}

	con = __raw_readl(reg);
	con &= ~(0x3 << shift);
	con |= cfg;
	__raw_writel(con, reg);

	return 0;
}

/*
 * samsung_gpio_getcfg_2bit - Samsung 2bit style GPIO configuration read.
 * @chip: The gpio chip that is being configured.
 * @off: The offset for the GPIO being configured.
 *
 * The reverse of samsung_gpio_setcfg_2bit(). Will return a value which
 * could be directly passed back to samsung_gpio_setcfg_2bit(), from the
 * S3C_GPIO_SPECIAL() macro.
 */

static unsigned int samsung_gpio_getcfg_2bit(struct samsung_gpio_chip *chip,
					     unsigned int off)
{
	u32 con;

	con = __raw_readl(chip->base);
	con >>= off * 2;
	con &= 3;

	/* this conversion works for IN and OUT as well as special mode */
	return S3C_GPIO_SPECIAL(con);
}

/*
 * samsung_gpio_setcfg_4bit - Samsung 4bit single register GPIO config.
 * @chip: The gpio chip that is being configured.
 * @off: The offset for the GPIO being configured.
 * @cfg: The configuration value to set.
 *
 * This helper deal with the GPIO cases where the control register has 4 bits
 * of control per GPIO, generally in the form of:
 *	0000 = Input
 *	0001 = Output
 *	others = Special functions (dependent on bank)
 *
 * Note, since the code to deal with the case where there are two control
 * registers instead of one, we do not have a separate set of functions for
 * each case.
 */

static int samsung_gpio_setcfg_4bit(struct samsung_gpio_chip *chip,
				    unsigned int off, unsigned int cfg)
{
	void __iomem *reg = chip->base;
	unsigned int shift = (off & 7) * 4;
	u32 con;

	if (off < 8 && chip->chip.ngpio > 8)
		reg -= 4;

	if (samsung_gpio_is_cfg_special(cfg)) {
		cfg &= 0xf;
		cfg <<= shift;
	}

	con = __raw_readl(reg);
	con &= ~(0xf << shift);
	con |= cfg;
	__raw_writel(con, reg);

	return 0;
}

/*
 * samsung_gpio_getcfg_4bit - Samsung 4bit single register GPIO config read.
 * @chip: The gpio chip that is being configured.
 * @off: The offset for the GPIO being configured.
 *
 * The reverse of samsung_gpio_setcfg_4bit(), turning a gpio configuration
 * register setting into a value the software can use, such as could be passed
 * to samsung_gpio_setcfg_4bit().
 *
 * @sa samsung_gpio_getcfg_2bit
 */

static unsigned samsung_gpio_getcfg_4bit(struct samsung_gpio_chip *chip,
					 unsigned int off)
{
	void __iomem *reg = chip->base;
	unsigned int shift = (off & 7) * 4;
	u32 con;

	if (off < 8 && chip->chip.ngpio > 8)
		reg -= 4;

	con = __raw_readl(reg);
	con >>= shift;
	con &= 0xf;

	/* this conversion works for IN and OUT as well as special mode */
	return S3C_GPIO_SPECIAL(con);
}

#ifdef CONFIG_PLAT_S3C24XX
/*
 * s3c24xx_gpio_setcfg_abank - S3C24XX style GPIO configuration (Bank A)
 * @chip: The gpio chip that is being configured.
 * @off: The offset for the GPIO being configured.
 * @cfg: The configuration value to set.
 *
 * This helper deal with the GPIO cases where the control register
 * has one bit of configuration for the gpio, where setting the bit
 * means the pin is in special function mode and unset means output.
 */

static int s3c24xx_gpio_setcfg_abank(struct samsung_gpio_chip *chip,
				     unsigned int off, unsigned int cfg)
{
	void __iomem *reg = chip->base;
	unsigned int shift = off;
	u32 con;

	if (samsung_gpio_is_cfg_special(cfg)) {
		cfg &= 0xf;

		/* Map output to 0, and SFN2 to 1 */
		cfg -= 1;
		if (cfg > 1)
			return -EINVAL;

		cfg <<= shift;
	}

	con = __raw_readl(reg);
	con &= ~(0x1 << shift);
	con |= cfg;
	__raw_writel(con, reg);

	return 0;
}

/*
 * s3c24xx_gpio_getcfg_abank - S3C24XX style GPIO configuration read (Bank A)
 * @chip: The gpio chip that is being configured.
 * @off: The offset for the GPIO being configured.
 *
 * The reverse of s3c24xx_gpio_setcfg_abank() turning an GPIO into a usable
 * GPIO configuration value.
 *
 * @sa samsung_gpio_getcfg_2bit
 * @sa samsung_gpio_getcfg_4bit
 */

static unsigned s3c24xx_gpio_getcfg_abank(struct samsung_gpio_chip *chip,
					  unsigned int off)
{
	u32 con;

	con = __raw_readl(chip->base);
	con >>= off;
	con &= 1;
	con++;

	return S3C_GPIO_SFN(con);
}
#endif

static void __init samsung_gpiolib_set_cfg(struct samsung_gpio_cfg *chipcfg,
					   int nr_chips)
{
	for (; nr_chips > 0; nr_chips--, chipcfg++) {
		if (!chipcfg->set_config)
			chipcfg->set_config = samsung_gpio_setcfg_4bit;
		if (!chipcfg->get_config)
			chipcfg->get_config = samsung_gpio_getcfg_4bit;
		if (!chipcfg->set_pull)
			chipcfg->set_pull = samsung_gpio_setpull_updown;
		if (!chipcfg->get_pull)
			chipcfg->get_pull = samsung_gpio_getpull_updown;
	}
}

struct samsung_gpio_cfg s3c24xx_gpiocfg_default = {
	.set_config	= samsung_gpio_setcfg_2bit,
	.get_config	= samsung_gpio_getcfg_2bit,
};

#ifdef CONFIG_PLAT_S3C24XX
static struct samsung_gpio_cfg s3c24xx_gpiocfg_banka = {
	.set_config	= s3c24xx_gpio_setcfg_abank,
	.get_config	= s3c24xx_gpio_getcfg_abank,
};
#endif

static struct samsung_gpio_cfg samsung_gpio_cfgs[] = {
	[0] = {
		.cfg_eint	= 0x0,
	},
	[1] = {
		.cfg_eint	= 0x3,
	},
	[2] = {
		.cfg_eint	= 0x7,
	},
	[3] = {
		.cfg_eint	= 0xF,
	},
	[4] = {
		.cfg_eint	= 0x0,
		.set_config	= samsung_gpio_setcfg_2bit,
		.get_config	= samsung_gpio_getcfg_2bit,
	},
	[5] = {
		.cfg_eint	= 0x2,
		.set_config	= samsung_gpio_setcfg_2bit,
		.get_config	= samsung_gpio_getcfg_2bit,
	},
	[6] = {
		.cfg_eint	= 0x3,
		.set_config	= samsung_gpio_setcfg_2bit,
		.get_config	= samsung_gpio_getcfg_2bit,
	},
	[7] = {
		.set_config	= samsung_gpio_setcfg_2bit,
		.get_config	= samsung_gpio_getcfg_2bit,
	},
};

/*
 * Default routines for controlling GPIO, based on the original S3C24XX
 * GPIO functions which deal with the case where each gpio bank of the
 * chip is as following:
 *
 * base + 0x00: Control register, 2 bits per gpio
 *	        gpio n: 2 bits starting at (2*n)
 *		00 = input, 01 = output, others mean special-function
 * base + 0x04: Data register, 1 bit per gpio
 *		bit n: data bit n
*/

static int samsung_gpiolib_2bit_input(struct gpio_chip *chip, unsigned offset)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long flags;
	unsigned long con;

	samsung_gpio_lock(ourchip, flags);

	con = __raw_readl(base + 0x00);
	con &= ~(3 << (offset * 2));

	__raw_writel(con, base + 0x00);

	samsung_gpio_unlock(ourchip, flags);
	return 0;
}

static int samsung_gpiolib_2bit_output(struct gpio_chip *chip,
				       unsigned offset, int value)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long flags;
	unsigned long dat;
	unsigned long con;

	samsung_gpio_lock(ourchip, flags);

	dat = __raw_readl(base + 0x04);
	dat &= ~(1 << offset);
	if (value)
		dat |= 1 << offset;
	__raw_writel(dat, base + 0x04);

	con = __raw_readl(base + 0x00);
	con &= ~(3 << (offset * 2));
	con |= 1 << (offset * 2);

	__raw_writel(con, base + 0x00);
	__raw_writel(dat, base + 0x04);

	samsung_gpio_unlock(ourchip, flags);
	return 0;
}

/*
 * The samsung_gpiolib_4bit routines are to control the gpio banks where
 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
 * following example:
 *
 * base + 0x00: Control register, 4 bits per gpio
 *		gpio n: 4 bits starting at (4*n)
 *		0000 = input, 0001 = output, others mean special-function
 * base + 0x04: Data register, 1 bit per gpio
 *		bit n: data bit n
 *
 * Note, since the data register is one bit per gpio and is at base + 0x4
 * we can use samsung_gpiolib_get and samsung_gpiolib_set to change the
 * state of the output.
 */

static int samsung_gpiolib_4bit_input(struct gpio_chip *chip,
				      unsigned int offset)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long con;

	con = __raw_readl(base + GPIOCON_OFF);
	if (ourchip->bitmap_gpio_int & BIT(offset))
		con |= 0xf << con_4bit_shift(offset);
	else
		con &= ~(0xf << con_4bit_shift(offset));
	__raw_writel(con, base + GPIOCON_OFF);

	pr_debug("%s: %p: CON now %08lx\n", __func__, base, con);

	return 0;
}

static int samsung_gpiolib_4bit_output(struct gpio_chip *chip,
				       unsigned int offset, int value)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long con;
	unsigned long dat;

	con = __raw_readl(base + GPIOCON_OFF);
	con &= ~(0xf << con_4bit_shift(offset));
	con |= 0x1 << con_4bit_shift(offset);

	dat = __raw_readl(base + GPIODAT_OFF);

	if (value)
		dat |= 1 << offset;
	else
		dat &= ~(1 << offset);

	__raw_writel(dat, base + GPIODAT_OFF);
	__raw_writel(con, base + GPIOCON_OFF);
	__raw_writel(dat, base + GPIODAT_OFF);

	pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);

	return 0;
}

/*
 * The next set of routines are for the case where the GPIO configuration
 * registers are 4 bits per GPIO but there is more than one register (the
 * bank has more than 8 GPIOs.
 *
 * This case is the similar to the 4 bit case, but the registers are as
 * follows:
 *
 * base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
 *		gpio n: 4 bits starting at (4*n)
 *		0000 = input, 0001 = output, others mean special-function
 * base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
 *		gpio n: 4 bits starting at (4*n)
 *		0000 = input, 0001 = output, others mean special-function
 * base + 0x08: Data register, 1 bit per gpio
 *		bit n: data bit n
 *
 * To allow us to use the samsung_gpiolib_get and samsung_gpiolib_set
 * routines we store the 'base + 0x4' address so that these routines see
 * the data register at ourchip->base + 0x04.
 */

static int samsung_gpiolib_4bit2_input(struct gpio_chip *chip,
				       unsigned int offset)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	void __iomem *regcon = base;
	unsigned long con;

	if (offset > 7)
		offset -= 8;
	else
		regcon -= 4;

	con = __raw_readl(regcon);
	con &= ~(0xf << con_4bit_shift(offset));
	__raw_writel(con, regcon);

	pr_debug("%s: %p: CON %08lx\n", __func__, base, con);

	return 0;
}

static int samsung_gpiolib_4bit2_output(struct gpio_chip *chip,
					unsigned int offset, int value)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	void __iomem *regcon = base;
	unsigned long con;
	unsigned long dat;
	unsigned con_offset = offset;

	if (con_offset > 7)
		con_offset -= 8;
	else
		regcon -= 4;

	con = __raw_readl(regcon);
	con &= ~(0xf << con_4bit_shift(con_offset));
	con |= 0x1 << con_4bit_shift(con_offset);

	dat = __raw_readl(base + GPIODAT_OFF);

	if (value)
		dat |= 1 << offset;
	else
		dat &= ~(1 << offset);

	__raw_writel(dat, base + GPIODAT_OFF);
	__raw_writel(con, regcon);
	__raw_writel(dat, base + GPIODAT_OFF);

	pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);

	return 0;
}

#ifdef CONFIG_PLAT_S3C24XX
/* The next set of routines are for the case of s3c24xx bank a */

static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
{
	return -EINVAL;
}

static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
					unsigned offset, int value)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long flags;
	unsigned long dat;
	unsigned long con;

	local_irq_save(flags);

	con = __raw_readl(base + 0x00);
	dat = __raw_readl(base + 0x04);

	dat &= ~(1 << offset);
	if (value)
		dat |= 1 << offset;

	__raw_writel(dat, base + 0x04);

	con &= ~(1 << offset);

	__raw_writel(con, base + 0x00);
	__raw_writel(dat, base + 0x04);

	local_irq_restore(flags);
	return 0;
}
#endif

static void samsung_gpiolib_set(struct gpio_chip *chip,
				unsigned offset, int value)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long flags;
	unsigned long dat;

	samsung_gpio_lock(ourchip, flags);

	dat = __raw_readl(base + 0x04);
	dat &= ~(1 << offset);
	if (value)
		dat |= 1 << offset;
	__raw_writel(dat, base + 0x04);

	samsung_gpio_unlock(ourchip, flags);
}

static int samsung_gpiolib_get(struct gpio_chip *chip, unsigned offset)
{
	struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
	unsigned long val;

	val = __raw_readl(ourchip->base + 0x04);
	val >>= offset;
	val &= 1;

	return val;
}

/*
 * CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
 * for use with the configuration calls, and other parts of the s3c gpiolib
 * support code.
 *
 * Not all s3c support code will need this, as some configurations of cpu
 * may only support one or two different configuration options and have an
 * easy gpio to samsung_gpio_chip mapping function. If this is the case, then
 * the machine support file should provide its own samsung_gpiolib_getchip()
 * and any other necessary functions.
 */

#ifdef CONFIG_S3C_GPIO_TRACK
struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];

static __init void s3c_gpiolib_track(struct samsung_gpio_chip *chip)
{
	unsigned int gpn;
	int i;

	gpn = chip->chip.base;
	for (i = 0; i < chip->chip.ngpio; i++, gpn++) {
		BUG_ON(gpn >= ARRAY_SIZE(s3c_gpios));
		s3c_gpios[gpn] = chip;
	}
}
#endif /* CONFIG_S3C_GPIO_TRACK */

/*
 * samsung_gpiolib_add() - add the Samsung gpio_chip.
 * @chip: The chip to register
 *
 * This is a wrapper to gpiochip_add() that takes our specific gpio chip
 * information and makes the necessary alterations for the platform and
 * notes the information for use with the configuration systems and any
 * other parts of the system.
 */

static void __init samsung_gpiolib_add(struct samsung_gpio_chip *chip)
{
	struct gpio_chip *gc = &chip->chip;
	int ret;

	BUG_ON(!chip->base);
	BUG_ON(!gc->label);
	BUG_ON(!gc->ngpio);

	spin_lock_init(&chip->lock);

	if (!gc->direction_input)
		gc->direction_input = samsung_gpiolib_2bit_input;
	if (!gc->direction_output)
		gc->direction_output = samsung_gpiolib_2bit_output;
	if (!gc->set)
		gc->set = samsung_gpiolib_set;
	if (!gc->get)
		gc->get = samsung_gpiolib_get;

#ifdef CONFIG_PM
	if (chip->pm != NULL) {
		if (!chip->pm->save || !chip->pm->resume)
			pr_err("gpio: %s has missing PM functions\n",
			       gc->label);
	} else
		pr_err("gpio: %s has no PM function\n", gc->label);
#endif

	/* gpiochip_add() prints own failure message on error. */
	ret = gpiochip_add(gc);
	if (ret >= 0)
		s3c_gpiolib_track(chip);
}

static void __init s3c24xx_gpiolib_add_chips(struct samsung_gpio_chip *chip,
					     int nr_chips, void __iomem *base)
{
	int i;
	struct gpio_chip *gc = &chip->chip;

	for (i = 0 ; i < nr_chips; i++, chip++) {
		/* skip banks not present on SoC */
		if (chip->chip.base >= S3C_GPIO_END)
			continue;

		if (!chip->config)
			chip->config = &s3c24xx_gpiocfg_default;
		if (!chip->pm)
			chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
		if ((base != NULL) && (chip->base == NULL))
			chip->base = base + ((i) * 0x10);

		if (!gc->direction_input)
			gc->direction_input = samsung_gpiolib_2bit_input;
		if (!gc->direction_output)
			gc->direction_output = samsung_gpiolib_2bit_output;

		samsung_gpiolib_add(chip);
	}
}

static void __init samsung_gpiolib_add_2bit_chips(struct samsung_gpio_chip *chip,
						  int nr_chips, void __iomem *base,
						  unsigned int offset)
{
	int i;

	for (i = 0 ; i < nr_chips; i++, chip++) {
		chip->chip.direction_input = samsung_gpiolib_2bit_input;
		chip->chip.direction_output = samsung_gpiolib_2bit_output;

		if (!chip->config)
			chip->config = &samsung_gpio_cfgs[7];
		if (!chip->pm)
			chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
		if ((base != NULL) && (chip->base == NULL))
			chip->base = base + ((i) * offset);

		samsung_gpiolib_add(chip);
	}
}

/*
 * samsung_gpiolib_add_4bit_chips - 4bit single register GPIO config.
 * @chip: The gpio chip that is being configured.
 * @nr_chips: The no of chips (gpio ports) for the GPIO being configured.
 *
 * This helper deal with the GPIO cases where the control register has 4 bits
 * of control per GPIO, generally in the form of:
 * 0000 = Input
 * 0001 = Output
 * others = Special functions (dependent on bank)
 *
 * Note, since the code to deal with the case where there are two control
 * registers instead of one, we do not have a separate set of function
 * (samsung_gpiolib_add_4bit2_chips)for each case.
 */

static void __init samsung_gpiolib_add_4bit_chips(struct samsung_gpio_chip *chip,
						  int nr_chips, void __iomem *base)
{
	int i;

	for (i = 0 ; i < nr_chips; i++, chip++) {
		chip->chip.direction_input = samsung_gpiolib_4bit_input;
		chip->chip.direction_output = samsung_gpiolib_4bit_output;

		if (!chip->config)
			chip->config = &samsung_gpio_cfgs[2];
		if (!chip->pm)
			chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
		if ((base != NULL) && (chip->base == NULL))
			chip->base = base + ((i) * 0x20);

		chip->bitmap_gpio_int = 0;

		samsung_gpiolib_add(chip);
	}
}

static void __init samsung_gpiolib_add_4bit2_chips(struct samsung_gpio_chip *chip,
						   int nr_chips)
{
	for (; nr_chips > 0; nr_chips--, chip++) {
		chip->chip.direction_input = samsung_gpiolib_4bit2_input;
		chip->chip.direction_output = samsung_gpiolib_4bit2_output;

		if (!chip->config)
			chip->config = &samsung_gpio_cfgs[2];
		if (!chip->pm)
			chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);

		samsung_gpiolib_add(chip);
	}
}

int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
{
	struct samsung_gpio_chip *samsung_chip = container_of(chip, struct samsung_gpio_chip, chip);

	return samsung_chip->irq_base + offset;
}

#ifdef CONFIG_PLAT_S3C24XX
static int s3c24xx_gpiolib_fbank_to_irq(struct gpio_chip *chip, unsigned offset)
{
	if (offset < 4) {
		if (soc_is_s3c2412())
			return IRQ_EINT0_2412 + offset;
		else
			return IRQ_EINT0 + offset;
	}

	if (offset < 8)
		return IRQ_EINT4 + offset - 4;

	return -EINVAL;
}
#endif

#ifdef CONFIG_ARCH_S3C64XX
static int s3c64xx_gpiolib_mbank_to_irq(struct gpio_chip *chip, unsigned pin)
{
	return pin < 5 ? IRQ_EINT(23) + pin : -ENXIO;
}

static int s3c64xx_gpiolib_lbank_to_irq(struct gpio_chip *chip, unsigned pin)
{
	return pin >= 8 ? IRQ_EINT(16) + pin - 8 : -ENXIO;
}
#endif

struct samsung_gpio_chip s3c24xx_gpios[] = {
#ifdef CONFIG_PLAT_S3C24XX
	{
		.config	= &s3c24xx_gpiocfg_banka,
		.chip	= {
			.base			= S3C2410_GPA(0),
			.owner			= THIS_MODULE,
			.label			= "GPIOA",
			.ngpio			= 27,
			.direction_input	= s3c24xx_gpiolib_banka_input,
			.direction_output	= s3c24xx_gpiolib_banka_output,
		},
	}, {
		.chip	= {
			.base	= S3C2410_GPB(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOB",
			.ngpio	= 11,
		},
	}, {
		.chip	= {
			.base	= S3C2410_GPC(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOC",
			.ngpio	= 16,
		},
	}, {
		.chip	= {
			.base	= S3C2410_GPD(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOD",
			.ngpio	= 16,
		},
	}, {
		.chip	= {
			.base	= S3C2410_GPE(0),
			.label	= "GPIOE",
			.owner	= THIS_MODULE,
			.ngpio	= 16,
		},
	}, {
		.chip	= {
			.base	= S3C2410_GPF(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOF",
			.ngpio	= 8,
			.to_irq	= s3c24xx_gpiolib_fbank_to_irq,
		},
	}, {
		.irq_base = IRQ_EINT8,
		.chip	= {
			.base	= S3C2410_GPG(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOG",
			.ngpio	= 16,
			.to_irq	= samsung_gpiolib_to_irq,
		},
	}, {
		.chip	= {
			.base	= S3C2410_GPH(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOH",
			.ngpio	= 15,
		},
	},
		/* GPIOS for the S3C2443 and later devices. */
	{
		.base	= S3C2440_GPJCON,
		.chip	= {
			.base	= S3C2410_GPJ(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOJ",
			.ngpio	= 16,
		},
	}, {
		.base	= S3C2443_GPKCON,
		.chip	= {
			.base	= S3C2410_GPK(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOK",
			.ngpio	= 16,
		},
	}, {
		.base	= S3C2443_GPLCON,
		.chip	= {
			.base	= S3C2410_GPL(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOL",
			.ngpio	= 15,
		},
	}, {
		.base	= S3C2443_GPMCON,
		.chip	= {
			.base	= S3C2410_GPM(0),
			.owner	= THIS_MODULE,
			.label	= "GPIOM",
			.ngpio	= 2,
		},
	},
#endif
};

/*
 * GPIO bank summary:
 *
 * Bank	GPIOs	Style	SlpCon	ExtInt Group
 * A	8	4Bit	Yes	1
 * B	7	4Bit	Yes	1
 * C	8	4Bit	Yes	2
 * D	5	4Bit	Yes	3
 * E	5	4Bit	Yes	None
 * F	16	2Bit	Yes	4 [1]
 * G	7	4Bit	Yes	5
 * H	10	4Bit[2]	Yes	6
 * I	16	2Bit	Yes	None
 * J	12	2Bit	Yes	None
 * K	16	4Bit[2]	No	None
 * L	15	4Bit[2] No	None
 * M	6	4Bit	No	IRQ_EINT
 * N	16	2Bit	No	IRQ_EINT
 * O	16	2Bit	Yes	7
 * P	15	2Bit	Yes	8
 * Q	9	2Bit	Yes	9
 *
 * [1] BANKF pins 14,15 do not form part of the external interrupt sources
 * [2] BANK has two control registers, GPxCON0 and GPxCON1
 */

static struct samsung_gpio_chip s3c64xx_gpios_4bit[] = {
#ifdef CONFIG_ARCH_S3C64XX
	{
		.chip	= {
			.base	= S3C64XX_GPA(0),
			.ngpio	= S3C64XX_GPIO_A_NR,
			.label	= "GPA",
		},
	}, {
		.chip	= {
			.base	= S3C64XX_GPB(0),
			.ngpio	= S3C64XX_GPIO_B_NR,
			.label	= "GPB",
		},
	}, {
		.chip	= {
			.base	= S3C64XX_GPC(0),
			.ngpio	= S3C64XX_GPIO_C_NR,
			.label	= "GPC",
		},
	}, {
		.chip	= {
			.base	= S3C64XX_GPD(0),
			.ngpio	= S3C64XX_GPIO_D_NR,
			.label	= "GPD",
		},
	}, {
		.config	= &samsung_gpio_cfgs[0],
		.chip	= {
			.base	= S3C64XX_GPE(0),
			.ngpio	= S3C64XX_GPIO_E_NR,
			.label	= "GPE",
		},
	}, {
		.base	= S3C64XX_GPG_BASE,
		.chip	= {
			.base	= S3C64XX_GPG(0),
			.ngpio	= S3C64XX_GPIO_G_NR,
			.label	= "GPG",
		},
	}, {
		.base	= S3C64XX_GPM_BASE,
		.config	= &samsung_gpio_cfgs[1],
		.chip	= {
			.base	= S3C64XX_GPM(0),
			.ngpio	= S3C64XX_GPIO_M_NR,
			.label	= "GPM",
			.to_irq = s3c64xx_gpiolib_mbank_to_irq,
		},
	},
#endif
};

static struct samsung_gpio_chip s3c64xx_gpios_4bit2[] = {
#ifdef CONFIG_ARCH_S3C64XX
	{
		.base	= S3C64XX_GPH_BASE + 0x4,
		.chip	= {
			.base	= S3C64XX_GPH(0),
			.ngpio	= S3C64XX_GPIO_H_NR,
			.label	= "GPH",
		},
	}, {
		.base	= S3C64XX_GPK_BASE + 0x4,
		.config	= &samsung_gpio_cfgs[0],
		.chip	= {
			.base	= S3C64XX_GPK(0),
			.ngpio	= S3C64XX_GPIO_K_NR,
			.label	= "GPK",
		},
	}, {
		.base	= S3C64XX_GPL_BASE + 0x4,
		.config	= &samsung_gpio_cfgs[1],
		.chip	= {
			.base	= S3C64XX_GPL(0),
			.ngpio	= S3C64XX_GPIO_L_NR,
			.label	= "GPL",
			.to_irq = s3c64xx_gpiolib_lbank_to_irq,
		},
	},
#endif
};

static struct samsung_gpio_chip s3c64xx_gpios_2bit[] = {
#ifdef CONFIG_ARCH_S3C64XX
	{
		.base	= S3C64XX_GPF_BASE,
		.config	= &samsung_gpio_cfgs[6],
		.chip	= {
			.base	= S3C64XX_GPF(0),
			.ngpio	= S3C64XX_GPIO_F_NR,
			.label	= "GPF",
		},
	}, {
		.config	= &samsung_gpio_cfgs[7],
		.chip	= {
			.base	= S3C64XX_GPI(0),
			.ngpio	= S3C64XX_GPIO_I_NR,
			.label	= "GPI",
		},
	}, {
		.config	= &samsung_gpio_cfgs[7],
		.chip	= {
			.base	= S3C64XX_GPJ(0),
			.ngpio	= S3C64XX_GPIO_J_NR,
			.label	= "GPJ",
		},
	}, {
		.config	= &samsung_gpio_cfgs[6],
		.chip	= {
			.base	= S3C64XX_GPO(0),
			.ngpio	= S3C64XX_GPIO_O_NR,
			.label	= "GPO",
		},
	}, {
		.config	= &samsung_gpio_cfgs[6],
		.chip	= {
			.base	= S3C64XX_GPP(0),
			.ngpio	= S3C64XX_GPIO_P_NR,
			.label	= "GPP",
		},
	}, {
		.config	= &samsung_gpio_cfgs[6],
		.chip	= {
			.base	= S3C64XX_GPQ(0),
			.ngpio	= S3C64XX_GPIO_Q_NR,
			.label	= "GPQ",
		},
	}, {
		.base	= S3C64XX_GPN_BASE,
		.irq_base = IRQ_EINT(0),
		.config	= &samsung_gpio_cfgs[5],
		.chip	= {
			.base	= S3C64XX_GPN(0),
			.ngpio	= S3C64XX_GPIO_N_NR,
			.label	= "GPN",
			.to_irq = samsung_gpiolib_to_irq,
		},
	},
#endif
};

/* TODO: cleanup soc_is_* */
static __init int samsung_gpiolib_init(void)
{
	/*
	 * Currently there are two drivers that can provide GPIO support for
	 * Samsung SoCs. For device tree enabled platforms, the new
	 * pinctrl-samsung driver is used, providing both GPIO and pin control
	 * interfaces. For legacy (non-DT) platforms this driver is used.
	 */
	if (of_have_populated_dt())
		return -ENODEV;

	samsung_gpiolib_set_cfg(samsung_gpio_cfgs, ARRAY_SIZE(samsung_gpio_cfgs));

	if (soc_is_s3c24xx()) {
		s3c24xx_gpiolib_add_chips(s3c24xx_gpios,
				ARRAY_SIZE(s3c24xx_gpios), S3C24XX_VA_GPIO);
	} else if (soc_is_s3c64xx()) {
		samsung_gpiolib_add_2bit_chips(s3c64xx_gpios_2bit,
				ARRAY_SIZE(s3c64xx_gpios_2bit),
				S3C64XX_VA_GPIO + 0xE0, 0x20);
		samsung_gpiolib_add_4bit_chips(s3c64xx_gpios_4bit,
				ARRAY_SIZE(s3c64xx_gpios_4bit),
				S3C64XX_VA_GPIO);
		samsung_gpiolib_add_4bit2_chips(s3c64xx_gpios_4bit2,
				ARRAY_SIZE(s3c64xx_gpios_4bit2));
	} else {
		WARN(1, "Unknown SoC in gpio-samsung, no GPIOs added\n");
		return -ENODEV;
	}

	return 0;
}
core_initcall(samsung_gpiolib_init);

int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
{
	struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
	unsigned long flags;
	int offset;
	int ret;

	if (!chip)
		return -EINVAL;

	offset = pin - chip->chip.base;

	samsung_gpio_lock(chip, flags);
	ret = samsung_gpio_do_setcfg(chip, offset, config);
	samsung_gpio_unlock(chip, flags);

	return ret;
}
EXPORT_SYMBOL(s3c_gpio_cfgpin);

int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
			  unsigned int cfg)
{
	int ret;

	for (; nr > 0; nr--, start++) {
		ret = s3c_gpio_cfgpin(start, cfg);
		if (ret != 0)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(s3c_gpio_cfgpin_range);

int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
			  unsigned int cfg, samsung_gpio_pull_t pull)
{
	int ret;

	for (; nr > 0; nr--, start++) {
		s3c_gpio_setpull(start, pull);
		ret = s3c_gpio_cfgpin(start, cfg);
		if (ret != 0)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(s3c_gpio_cfgall_range);

unsigned s3c_gpio_getcfg(unsigned int pin)
{
	struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
	unsigned long flags;
	unsigned ret = 0;
	int offset;

	if (chip) {
		offset = pin - chip->chip.base;

		samsung_gpio_lock(chip, flags);
		ret = samsung_gpio_do_getcfg(chip, offset);
		samsung_gpio_unlock(chip, flags);
	}

	return ret;
}
EXPORT_SYMBOL(s3c_gpio_getcfg);

int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull)
{
	struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
	unsigned long flags;
	int offset, ret;

	if (!chip)
		return -EINVAL;

	offset = pin - chip->chip.base;

	samsung_gpio_lock(chip, flags);
	ret = samsung_gpio_do_setpull(chip, offset, pull);
	samsung_gpio_unlock(chip, flags);

	return ret;
}
EXPORT_SYMBOL(s3c_gpio_setpull);

samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin)
{
	struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
	unsigned long flags;
	int offset;
	u32 pup = 0;

	if (chip) {
		offset = pin - chip->chip.base;

		samsung_gpio_lock(chip, flags);
		pup = samsung_gpio_do_getpull(chip, offset);
		samsung_gpio_unlock(chip, flags);
	}

	return (__force samsung_gpio_pull_t)pup;
}
EXPORT_SYMBOL(s3c_gpio_getpull);

#ifdef CONFIG_PLAT_S3C24XX
unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
{
	unsigned long flags;
	unsigned long misccr;

	local_irq_save(flags);
	misccr = __raw_readl(S3C24XX_MISCCR);
	misccr &= ~clear;
	misccr ^= change;
	__raw_writel(misccr, S3C24XX_MISCCR);
	local_irq_restore(flags);

	return misccr;
}
EXPORT_SYMBOL(s3c2410_modify_misccr);
#endif