aboutsummaryrefslogtreecommitdiff
path: root/drivers/pinctrl/pinctrl-nomadik.c
blob: 3dde6537adb878d7986a96b2dba528d41cf77d1a (plain)
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
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
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
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
/*
 * Generic GPIO driver for logic cells found in the Nomadik SoC
 *
 * Copyright (C) 2008,2009 STMicroelectronics
 * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
 *   Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
 * Copyright (C) 2011 Linus Walleij <linus.walleij@linaro.org>
 *
 * 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/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
/* Since we request GPIOs from ourself */
#include <linux/pinctrl/consumer.h>

#include <asm/mach/irq.h>

#include <plat/pincfg.h>
#include <plat/gpio-nomadik.h>

#include "pinctrl-nomadik.h"

/*
 * The GPIO module in the Nomadik family of Systems-on-Chip is an
 * AMBA device, managing 32 pins and alternate functions.  The logic block
 * is currently used in the Nomadik and ux500.
 *
 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
 */

#define NMK_GPIO_PER_CHIP	32

struct nmk_gpio_chip {
	struct gpio_chip chip;
	struct irq_domain *domain;
	void __iomem *addr;
	struct clk *clk;
	unsigned int bank;
	unsigned int parent_irq;
	int secondary_parent_irq;
	u32 (*get_secondary_status)(unsigned int bank);
	void (*set_ioforce)(bool enable);
	spinlock_t lock;
	bool sleepmode;
	/* Keep track of configured edges */
	u32 edge_rising;
	u32 edge_falling;
	u32 real_wake;
	u32 rwimsc;
	u32 fwimsc;
	u32 rimsc;
	u32 fimsc;
	u32 pull_up;
	u32 lowemi;
};

struct nmk_pinctrl {
	struct device *dev;
	struct pinctrl_dev *pctl;
	const struct nmk_pinctrl_soc_data *soc;
};

static struct nmk_gpio_chip *
nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)];

static DEFINE_SPINLOCK(nmk_gpio_slpm_lock);

#define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips)

static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
				unsigned offset, int gpio_mode)
{
	u32 bit = 1 << offset;
	u32 afunc, bfunc;

	afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
	bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
	if (gpio_mode & NMK_GPIO_ALT_A)
		afunc |= bit;
	if (gpio_mode & NMK_GPIO_ALT_B)
		bfunc |= bit;
	writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
	writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
}

static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
				unsigned offset, enum nmk_gpio_slpm mode)
{
	u32 bit = 1 << offset;
	u32 slpm;

	slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
	if (mode == NMK_GPIO_SLPM_NOCHANGE)
		slpm |= bit;
	else
		slpm &= ~bit;
	writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
}

static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
				unsigned offset, enum nmk_gpio_pull pull)
{
	u32 bit = 1 << offset;
	u32 pdis;

	pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
	if (pull == NMK_GPIO_PULL_NONE) {
		pdis |= bit;
		nmk_chip->pull_up &= ~bit;
	} else {
		pdis &= ~bit;
	}

	writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);

	if (pull == NMK_GPIO_PULL_UP) {
		nmk_chip->pull_up |= bit;
		writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
	} else if (pull == NMK_GPIO_PULL_DOWN) {
		nmk_chip->pull_up &= ~bit;
		writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
	}
}

static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip,
				  unsigned offset, bool lowemi)
{
	u32 bit = BIT(offset);
	bool enabled = nmk_chip->lowemi & bit;

	if (lowemi == enabled)
		return;

	if (lowemi)
		nmk_chip->lowemi |= bit;
	else
		nmk_chip->lowemi &= ~bit;

	writel_relaxed(nmk_chip->lowemi,
		       nmk_chip->addr + NMK_GPIO_LOWEMI);
}

static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
				  unsigned offset)
{
	writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
}

static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip,
				  unsigned offset, int val)
{
	if (val)
		writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS);
	else
		writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC);
}

static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip,
				  unsigned offset, int val)
{
	writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
	__nmk_gpio_set_output(nmk_chip, offset, val);
}

static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
				     unsigned offset, int gpio_mode,
				     bool glitch)
{
	u32 rwimsc = nmk_chip->rwimsc;
	u32 fwimsc = nmk_chip->fwimsc;

	if (glitch && nmk_chip->set_ioforce) {
		u32 bit = BIT(offset);

		/* Prevent spurious wakeups */
		writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC);
		writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC);

		nmk_chip->set_ioforce(true);
	}

	__nmk_gpio_set_mode(nmk_chip, offset, gpio_mode);

	if (glitch && nmk_chip->set_ioforce) {
		nmk_chip->set_ioforce(false);

		writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC);
		writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC);
	}
}

static void
nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
{
	u32 falling = nmk_chip->fimsc & BIT(offset);
	u32 rising = nmk_chip->rimsc & BIT(offset);
	int gpio = nmk_chip->chip.base + offset;
	int irq = NOMADIK_GPIO_TO_IRQ(gpio);
	struct irq_data *d = irq_get_irq_data(irq);

	if (!rising && !falling)
		return;

	if (!d || !irqd_irq_disabled(d))
		return;

	if (rising) {
		nmk_chip->rimsc &= ~BIT(offset);
		writel_relaxed(nmk_chip->rimsc,
			       nmk_chip->addr + NMK_GPIO_RIMSC);
	}

	if (falling) {
		nmk_chip->fimsc &= ~BIT(offset);
		writel_relaxed(nmk_chip->fimsc,
			       nmk_chip->addr + NMK_GPIO_FIMSC);
	}

	dev_dbg(nmk_chip->chip.dev, "%d: clearing interrupt mask\n", gpio);
}

static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
			     pin_cfg_t cfg, bool sleep, unsigned int *slpmregs)
{
	static const char *afnames[] = {
		[NMK_GPIO_ALT_GPIO]	= "GPIO",
		[NMK_GPIO_ALT_A]	= "A",
		[NMK_GPIO_ALT_B]	= "B",
		[NMK_GPIO_ALT_C]	= "C"
	};
	static const char *pullnames[] = {
		[NMK_GPIO_PULL_NONE]	= "none",
		[NMK_GPIO_PULL_UP]	= "up",
		[NMK_GPIO_PULL_DOWN]	= "down",
		[3] /* illegal */	= "??"
	};
	static const char *slpmnames[] = {
		[NMK_GPIO_SLPM_INPUT]		= "input/wakeup",
		[NMK_GPIO_SLPM_NOCHANGE]	= "no-change/no-wakeup",
	};

	int pin = PIN_NUM(cfg);
	int pull = PIN_PULL(cfg);
	int af = PIN_ALT(cfg);
	int slpm = PIN_SLPM(cfg);
	int output = PIN_DIR(cfg);
	int val = PIN_VAL(cfg);
	bool glitch = af == NMK_GPIO_ALT_C;

	dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: af %s, pull %s, slpm %s (%s%s)\n",
		pin, cfg, afnames[af], pullnames[pull], slpmnames[slpm],
		output ? "output " : "input",
		output ? (val ? "high" : "low") : "");

	if (sleep) {
		int slpm_pull = PIN_SLPM_PULL(cfg);
		int slpm_output = PIN_SLPM_DIR(cfg);
		int slpm_val = PIN_SLPM_VAL(cfg);

		af = NMK_GPIO_ALT_GPIO;

		/*
		 * The SLPM_* values are normal values + 1 to allow zero to
		 * mean "same as normal".
		 */
		if (slpm_pull)
			pull = slpm_pull - 1;
		if (slpm_output)
			output = slpm_output - 1;
		if (slpm_val)
			val = slpm_val - 1;

		dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n",
			pin,
			slpm_pull ? pullnames[pull] : "same",
			slpm_output ? (output ? "output" : "input") : "same",
			slpm_val ? (val ? "high" : "low") : "same");
	}

	if (output)
		__nmk_gpio_make_output(nmk_chip, offset, val);
	else {
		__nmk_gpio_make_input(nmk_chip, offset);
		__nmk_gpio_set_pull(nmk_chip, offset, pull);
	}

	__nmk_gpio_set_lowemi(nmk_chip, offset, PIN_LOWEMI(cfg));

	/*
	 * If the pin is switching to altfunc, and there was an interrupt
	 * installed on it which has been lazy disabled, actually mask the
	 * interrupt to prevent spurious interrupts that would occur while the
	 * pin is under control of the peripheral.  Only SKE does this.
	 */
	if (af != NMK_GPIO_ALT_GPIO)
		nmk_gpio_disable_lazy_irq(nmk_chip, offset);

	/*
	 * If we've backed up the SLPM registers (glitch workaround), modify
	 * the backups since they will be restored.
	 */
	if (slpmregs) {
		if (slpm == NMK_GPIO_SLPM_NOCHANGE)
			slpmregs[nmk_chip->bank] |= BIT(offset);
		else
			slpmregs[nmk_chip->bank] &= ~BIT(offset);
	} else
		__nmk_gpio_set_slpm(nmk_chip, offset, slpm);

	__nmk_gpio_set_mode_safe(nmk_chip, offset, af, glitch);
}

/*
 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
 *  - Save SLPM registers
 *  - Set SLPM=0 for the IOs you want to switch and others to 1
 *  - Configure the GPIO registers for the IOs that are being switched
 *  - Set IOFORCE=1
 *  - Modify the AFLSA/B registers for the IOs that are being switched
 *  - Set IOFORCE=0
 *  - Restore SLPM registers
 *  - Any spurious wake up event during switch sequence to be ignored and
 *    cleared
 */
static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
{
	int i;

	for (i = 0; i < NUM_BANKS; i++) {
		struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
		unsigned int temp = slpm[i];

		if (!chip)
			break;

		clk_enable(chip->clk);

		slpm[i] = readl(chip->addr + NMK_GPIO_SLPC);
		writel(temp, chip->addr + NMK_GPIO_SLPC);
	}
}

static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm)
{
	int i;

	for (i = 0; i < NUM_BANKS; i++) {
		struct nmk_gpio_chip *chip = nmk_gpio_chips[i];

		if (!chip)
			break;

		writel(slpm[i], chip->addr + NMK_GPIO_SLPC);

		clk_disable(chip->clk);
	}
}

static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep)
{
	static unsigned int slpm[NUM_BANKS];
	unsigned long flags;
	bool glitch = false;
	int ret = 0;
	int i;

	for (i = 0; i < num; i++) {
		if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) {
			glitch = true;
			break;
		}
	}

	spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);

	if (glitch) {
		memset(slpm, 0xff, sizeof(slpm));

		for (i = 0; i < num; i++) {
			int pin = PIN_NUM(cfgs[i]);
			int offset = pin % NMK_GPIO_PER_CHIP;

			if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C)
				slpm[pin / NMK_GPIO_PER_CHIP] &= ~BIT(offset);
		}

		nmk_gpio_glitch_slpm_init(slpm);
	}

	for (i = 0; i < num; i++) {
		struct nmk_gpio_chip *nmk_chip;
		int pin = PIN_NUM(cfgs[i]);

		nmk_chip = nmk_gpio_chips[pin / NMK_GPIO_PER_CHIP];
		if (!nmk_chip) {
			ret = -EINVAL;
			break;
		}

		clk_enable(nmk_chip->clk);
		spin_lock(&nmk_chip->lock);
		__nmk_config_pin(nmk_chip, pin % NMK_GPIO_PER_CHIP,
				 cfgs[i], sleep, glitch ? slpm : NULL);
		spin_unlock(&nmk_chip->lock);
		clk_disable(nmk_chip->clk);
	}

	if (glitch)
		nmk_gpio_glitch_slpm_restore(slpm);

	spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);

	return ret;
}

/**
 * nmk_config_pin - configure a pin's mux attributes
 * @cfg: pin confguration
 * @sleep: Non-zero to apply the sleep mode configuration
 * Configures a pin's mode (alternate function or GPIO), its pull up status,
 * and its sleep mode based on the specified configuration.  The @cfg is
 * usually one of the SoC specific macros defined in mach/<soc>-pins.h.  These
 * are constructed using, and can be further enhanced with, the macros in
 * plat/pincfg.h.
 *
 * If a pin's mode is set to GPIO, it is configured as an input to avoid
 * side-effects.  The gpio can be manipulated later using standard GPIO API
 * calls.
 */
int nmk_config_pin(pin_cfg_t cfg, bool sleep)
{
	return __nmk_config_pins(&cfg, 1, sleep);
}
EXPORT_SYMBOL(nmk_config_pin);

/**
 * nmk_config_pins - configure several pins at once
 * @cfgs: array of pin configurations
 * @num: number of elments in the array
 *
 * Configures several pins using nmk_config_pin().  Refer to that function for
 * further information.
 */
int nmk_config_pins(pin_cfg_t *cfgs, int num)
{
	return __nmk_config_pins(cfgs, num, false);
}
EXPORT_SYMBOL(nmk_config_pins);

int nmk_config_pins_sleep(pin_cfg_t *cfgs, int num)
{
	return __nmk_config_pins(cfgs, num, true);
}
EXPORT_SYMBOL(nmk_config_pins_sleep);

/**
 * nmk_gpio_set_slpm() - configure the sleep mode of a pin
 * @gpio: pin number
 * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
 *
 * This register is actually in the pinmux layer, not the GPIO block itself.
 * The GPIO1B_SLPM register defines the GPIO mode when SLEEP/DEEP-SLEEP
 * mode is entered (i.e. when signal IOFORCE is HIGH by the platform code).
 * Each GPIO can be configured to be forced into GPIO mode when IOFORCE is
 * HIGH, overriding the normal setting defined by GPIO_AFSELx registers.
 * When IOFORCE returns LOW (by software, after SLEEP/DEEP-SLEEP exit),
 * the GPIOs return to the normal setting defined by GPIO_AFSELx registers.
 *
 * If @mode is NMK_GPIO_SLPM_INPUT, the corresponding GPIO is switched to GPIO
 * mode when signal IOFORCE is HIGH (i.e. when SLEEP/DEEP-SLEEP mode is
 * entered) regardless of the altfunction selected. Also wake-up detection is
 * ENABLED.
 *
 * If @mode is NMK_GPIO_SLPM_NOCHANGE, the corresponding GPIO remains
 * controlled by NMK_GPIO_DATC, NMK_GPIO_DATS, NMK_GPIO_DIR, NMK_GPIO_PDIS
 * (for altfunction GPIO) or respective on-chip peripherals (for other
 * altfuncs) when IOFORCE is HIGH. Also wake-up detection DISABLED.
 *
 * Note that enable_irq_wake() will automatically enable wakeup detection.
 */
int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
{
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;

	nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
	if (!nmk_chip)
		return -EINVAL;

	clk_enable(nmk_chip->clk);
	spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
	spin_lock(&nmk_chip->lock);

	__nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP, mode);

	spin_unlock(&nmk_chip->lock);
	spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
	clk_disable(nmk_chip->clk);

	return 0;
}

/**
 * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio
 * @gpio: pin number
 * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE
 *
 * Enables/disables pull up/down on a specified pin.  This only takes effect if
 * the pin is configured as an input (either explicitly or by the alternate
 * function).
 *
 * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
 * configured as an input.  Otherwise, due to the way the controller registers
 * work, this function will change the value output on the pin.
 */
int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
{
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;

	nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
	if (!nmk_chip)
		return -EINVAL;

	clk_enable(nmk_chip->clk);
	spin_lock_irqsave(&nmk_chip->lock, flags);
	__nmk_gpio_set_pull(nmk_chip, gpio % NMK_GPIO_PER_CHIP, pull);
	spin_unlock_irqrestore(&nmk_chip->lock, flags);
	clk_disable(nmk_chip->clk);

	return 0;
}

/* Mode functions */
/**
 * nmk_gpio_set_mode() - set the mux mode of a gpio pin
 * @gpio: pin number
 * @gpio_mode: one of NMK_GPIO_ALT_GPIO, NMK_GPIO_ALT_A,
 *	       NMK_GPIO_ALT_B, and NMK_GPIO_ALT_C
 *
 * Sets the mode of the specified pin to one of the alternate functions or
 * plain GPIO.
 */
int nmk_gpio_set_mode(int gpio, int gpio_mode)
{
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;

	nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
	if (!nmk_chip)
		return -EINVAL;

	clk_enable(nmk_chip->clk);
	spin_lock_irqsave(&nmk_chip->lock, flags);
	__nmk_gpio_set_mode(nmk_chip, gpio % NMK_GPIO_PER_CHIP, gpio_mode);
	spin_unlock_irqrestore(&nmk_chip->lock, flags);
	clk_disable(nmk_chip->clk);

	return 0;
}
EXPORT_SYMBOL(nmk_gpio_set_mode);

int nmk_gpio_get_mode(int gpio)
{
	struct nmk_gpio_chip *nmk_chip;
	u32 afunc, bfunc, bit;

	nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
	if (!nmk_chip)
		return -EINVAL;

	bit = 1 << (gpio % NMK_GPIO_PER_CHIP);

	clk_enable(nmk_chip->clk);

	afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
	bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;

	clk_disable(nmk_chip->clk);

	return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
}
EXPORT_SYMBOL(nmk_gpio_get_mode);


/* IRQ functions */
static inline int nmk_gpio_get_bitmask(int gpio)
{
	return 1 << (gpio % NMK_GPIO_PER_CHIP);
}

static void nmk_gpio_irq_ack(struct irq_data *d)
{
	struct nmk_gpio_chip *nmk_chip;

	nmk_chip = irq_data_get_irq_chip_data(d);
	if (!nmk_chip)
		return;

	clk_enable(nmk_chip->clk);
	writel(nmk_gpio_get_bitmask(d->hwirq), nmk_chip->addr + NMK_GPIO_IC);
	clk_disable(nmk_chip->clk);
}

enum nmk_gpio_irq_type {
	NORMAL,
	WAKE,
};

static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
				  int gpio, enum nmk_gpio_irq_type which,
				  bool enable)
{
	u32 bitmask = nmk_gpio_get_bitmask(gpio);
	u32 *rimscval;
	u32 *fimscval;
	u32 rimscreg;
	u32 fimscreg;

	if (which == NORMAL) {
		rimscreg = NMK_GPIO_RIMSC;
		fimscreg = NMK_GPIO_FIMSC;
		rimscval = &nmk_chip->rimsc;
		fimscval = &nmk_chip->fimsc;
	} else  {
		rimscreg = NMK_GPIO_RWIMSC;
		fimscreg = NMK_GPIO_FWIMSC;
		rimscval = &nmk_chip->rwimsc;
		fimscval = &nmk_chip->fwimsc;
	}

	/* we must individually set/clear the two edges */
	if (nmk_chip->edge_rising & bitmask) {
		if (enable)
			*rimscval |= bitmask;
		else
			*rimscval &= ~bitmask;
		writel(*rimscval, nmk_chip->addr + rimscreg);
	}
	if (nmk_chip->edge_falling & bitmask) {
		if (enable)
			*fimscval |= bitmask;
		else
			*fimscval &= ~bitmask;
		writel(*fimscval, nmk_chip->addr + fimscreg);
	}
}

static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
				int gpio, bool on)
{
	/*
	 * Ensure WAKEUP_ENABLE is on.  No need to disable it if wakeup is
	 * disabled, since setting SLPM to 1 increases power consumption, and
	 * wakeup is anyhow controlled by the RIMSC and FIMSC registers.
	 */
	if (nmk_chip->sleepmode && on) {
		__nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP,
				    NMK_GPIO_SLPM_WAKEUP_ENABLE);
	}

	__nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
}

static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
{
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;
	u32 bitmask;

	nmk_chip = irq_data_get_irq_chip_data(d);
	bitmask = nmk_gpio_get_bitmask(d->hwirq);
	if (!nmk_chip)
		return -EINVAL;

	clk_enable(nmk_chip->clk);
	spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
	spin_lock(&nmk_chip->lock);

	__nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, enable);

	if (!(nmk_chip->real_wake & bitmask))
		__nmk_gpio_set_wake(nmk_chip, d->hwirq, enable);

	spin_unlock(&nmk_chip->lock);
	spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
	clk_disable(nmk_chip->clk);

	return 0;
}

static void nmk_gpio_irq_mask(struct irq_data *d)
{
	nmk_gpio_irq_maskunmask(d, false);
}

static void nmk_gpio_irq_unmask(struct irq_data *d)
{
	nmk_gpio_irq_maskunmask(d, true);
}

static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
{
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;
	u32 bitmask;

	nmk_chip = irq_data_get_irq_chip_data(d);
	if (!nmk_chip)
		return -EINVAL;
	bitmask = nmk_gpio_get_bitmask(d->hwirq);

	clk_enable(nmk_chip->clk);
	spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
	spin_lock(&nmk_chip->lock);

	if (irqd_irq_disabled(d))
		__nmk_gpio_set_wake(nmk_chip, d->hwirq, on);

	if (on)
		nmk_chip->real_wake |= bitmask;
	else
		nmk_chip->real_wake &= ~bitmask;

	spin_unlock(&nmk_chip->lock);
	spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
	clk_disable(nmk_chip->clk);

	return 0;
}

static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
	bool enabled = !irqd_irq_disabled(d);
	bool wake = irqd_is_wakeup_set(d);
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;
	u32 bitmask;

	nmk_chip = irq_data_get_irq_chip_data(d);
	bitmask = nmk_gpio_get_bitmask(d->hwirq);
	if (!nmk_chip)
		return -EINVAL;
	if (type & IRQ_TYPE_LEVEL_HIGH)
		return -EINVAL;
	if (type & IRQ_TYPE_LEVEL_LOW)
		return -EINVAL;

	clk_enable(nmk_chip->clk);
	spin_lock_irqsave(&nmk_chip->lock, flags);

	if (enabled)
		__nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, false);

	if (enabled || wake)
		__nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, false);

	nmk_chip->edge_rising &= ~bitmask;
	if (type & IRQ_TYPE_EDGE_RISING)
		nmk_chip->edge_rising |= bitmask;

	nmk_chip->edge_falling &= ~bitmask;
	if (type & IRQ_TYPE_EDGE_FALLING)
		nmk_chip->edge_falling |= bitmask;

	if (enabled)
		__nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, true);

	if (enabled || wake)
		__nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, true);

	spin_unlock_irqrestore(&nmk_chip->lock, flags);
	clk_disable(nmk_chip->clk);

	return 0;
}

static unsigned int nmk_gpio_irq_startup(struct irq_data *d)
{
	struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);

	clk_enable(nmk_chip->clk);
	nmk_gpio_irq_unmask(d);
	return 0;
}

static void nmk_gpio_irq_shutdown(struct irq_data *d)
{
	struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);

	nmk_gpio_irq_mask(d);
	clk_disable(nmk_chip->clk);
}

static struct irq_chip nmk_gpio_irq_chip = {
	.name		= "Nomadik-GPIO",
	.irq_ack	= nmk_gpio_irq_ack,
	.irq_mask	= nmk_gpio_irq_mask,
	.irq_unmask	= nmk_gpio_irq_unmask,
	.irq_set_type	= nmk_gpio_irq_set_type,
	.irq_set_wake	= nmk_gpio_irq_set_wake,
	.irq_startup	= nmk_gpio_irq_startup,
	.irq_shutdown	= nmk_gpio_irq_shutdown,
};

static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
				   u32 status)
{
	struct nmk_gpio_chip *nmk_chip;
	struct irq_chip *host_chip = irq_get_chip(irq);
	unsigned int first_irq;

	chained_irq_enter(host_chip, desc);

	nmk_chip = irq_get_handler_data(irq);
	first_irq = nmk_chip->domain->revmap_data.legacy.first_irq;
	while (status) {
		int bit = __ffs(status);

		generic_handle_irq(first_irq + bit);
		status &= ~BIT(bit);
	}

	chained_irq_exit(host_chip, desc);
}

static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
	u32 status;

	clk_enable(nmk_chip->clk);
	status = readl(nmk_chip->addr + NMK_GPIO_IS);
	clk_disable(nmk_chip->clk);

	__nmk_gpio_irq_handler(irq, desc, status);
}

static void nmk_gpio_secondary_irq_handler(unsigned int irq,
					   struct irq_desc *desc)
{
	struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
	u32 status = nmk_chip->get_secondary_status(nmk_chip->bank);

	__nmk_gpio_irq_handler(irq, desc, status);
}

static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
{
	irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
	irq_set_handler_data(nmk_chip->parent_irq, nmk_chip);

	if (nmk_chip->secondary_parent_irq >= 0) {
		irq_set_chained_handler(nmk_chip->secondary_parent_irq,
					nmk_gpio_secondary_irq_handler);
		irq_set_handler_data(nmk_chip->secondary_parent_irq, nmk_chip);
	}

	return 0;
}

/* I/O Functions */

static int nmk_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	/*
	 * Map back to global GPIO space and request muxing, the direction
	 * parameter does not matter for this controller.
	 */
	int gpio = chip->base + offset;

	return pinctrl_request_gpio(gpio);
}

static void nmk_gpio_free(struct gpio_chip *chip, unsigned offset)
{
	int gpio = chip->base + offset;

	pinctrl_free_gpio(gpio);
}

static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);

	clk_enable(nmk_chip->clk);

	writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);

	clk_disable(nmk_chip->clk);

	return 0;
}

static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);
	u32 bit = 1 << offset;
	int value;

	clk_enable(nmk_chip->clk);

	value = (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;

	clk_disable(nmk_chip->clk);

	return value;
}

static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
				int val)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);

	clk_enable(nmk_chip->clk);

	__nmk_gpio_set_output(nmk_chip, offset, val);

	clk_disable(nmk_chip->clk);
}

static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
				int val)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);

	clk_enable(nmk_chip->clk);

	__nmk_gpio_make_output(nmk_chip, offset, val);

	clk_disable(nmk_chip->clk);

	return 0;
}

static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);

	return irq_find_mapping(nmk_chip->domain, offset);
}

#ifdef CONFIG_DEBUG_FS

#include <linux/seq_file.h>

static void nmk_gpio_dbg_show_one(struct seq_file *s, struct gpio_chip *chip,
				  unsigned offset, unsigned gpio)
{
	const char *label = gpiochip_is_requested(chip, offset);
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);
	int mode;
	bool is_out;
	bool pull;
	u32 bit = 1 << offset;
	const char *modes[] = {
		[NMK_GPIO_ALT_GPIO]	= "gpio",
		[NMK_GPIO_ALT_A]	= "altA",
		[NMK_GPIO_ALT_B]	= "altB",
		[NMK_GPIO_ALT_C]	= "altC",
	};

	clk_enable(nmk_chip->clk);
	is_out = !!(readl(nmk_chip->addr + NMK_GPIO_DIR) & bit);
	pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
	mode = nmk_gpio_get_mode(gpio);

	seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
		   gpio, label ?: "(none)",
		   is_out ? "out" : "in ",
		   chip->get
		   ? (chip->get(chip, offset) ? "hi" : "lo")
		   : "?  ",
		   (mode < 0) ? "unknown" : modes[mode],
		   pull ? "pull" : "none");

	if (label && !is_out) {
		int		irq = gpio_to_irq(gpio);
		struct irq_desc	*desc = irq_to_desc(irq);

		/* This races with request_irq(), set_irq_type(),
		 * and set_irq_wake() ... but those are "rare".
		 */
		if (irq >= 0 && desc->action) {
			char *trigger;
			u32 bitmask = nmk_gpio_get_bitmask(gpio);

			if (nmk_chip->edge_rising & bitmask)
				trigger = "edge-rising";
			else if (nmk_chip->edge_falling & bitmask)
				trigger = "edge-falling";
			else
				trigger = "edge-undefined";

			seq_printf(s, " irq-%d %s%s",
				   irq, trigger,
				   irqd_is_wakeup_set(&desc->irq_data)
				   ? " wakeup" : "");
		}
	}
	clk_disable(nmk_chip->clk);
}

static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	unsigned		i;
	unsigned		gpio = chip->base;

	for (i = 0; i < chip->ngpio; i++, gpio++) {
		nmk_gpio_dbg_show_one(s, chip, i, gpio);
		seq_printf(s, "\n");
	}
}

#else
static inline void nmk_gpio_dbg_show_one(struct seq_file *s,
					 struct gpio_chip *chip,
					 unsigned offset, unsigned gpio)
{
}
#define nmk_gpio_dbg_show	NULL
#endif

/* This structure is replicated for each GPIO block allocated at probe time */
static struct gpio_chip nmk_gpio_template = {
	.request		= nmk_gpio_request,
	.free			= nmk_gpio_free,
	.direction_input	= nmk_gpio_make_input,
	.get			= nmk_gpio_get_input,
	.direction_output	= nmk_gpio_make_output,
	.set			= nmk_gpio_set_output,
	.to_irq			= nmk_gpio_to_irq,
	.dbg_show		= nmk_gpio_dbg_show,
	.can_sleep		= 0,
};

void nmk_gpio_clocks_enable(void)
{
	int i;

	for (i = 0; i < NUM_BANKS; i++) {
		struct nmk_gpio_chip *chip = nmk_gpio_chips[i];

		if (!chip)
			continue;

		clk_enable(chip->clk);
	}
}

void nmk_gpio_clocks_disable(void)
{
	int i;

	for (i = 0; i < NUM_BANKS; i++) {
		struct nmk_gpio_chip *chip = nmk_gpio_chips[i];

		if (!chip)
			continue;

		clk_disable(chip->clk);
	}
}

/*
 * Called from the suspend/resume path to only keep the real wakeup interrupts
 * (those that have had set_irq_wake() called on them) as wakeup interrupts,
 * and not the rest of the interrupts which we needed to have as wakeups for
 * cpuidle.
 *
 * PM ops are not used since this needs to be done at the end, after all the
 * other drivers are done with their suspend callbacks.
 */
void nmk_gpio_wakeups_suspend(void)
{
	int i;

	for (i = 0; i < NUM_BANKS; i++) {
		struct nmk_gpio_chip *chip = nmk_gpio_chips[i];

		if (!chip)
			break;

		clk_enable(chip->clk);

		writel(chip->rwimsc & chip->real_wake,
		       chip->addr + NMK_GPIO_RWIMSC);
		writel(chip->fwimsc & chip->real_wake,
		       chip->addr + NMK_GPIO_FWIMSC);

		clk_disable(chip->clk);
	}
}

void nmk_gpio_wakeups_resume(void)
{
	int i;

	for (i = 0; i < NUM_BANKS; i++) {
		struct nmk_gpio_chip *chip = nmk_gpio_chips[i];

		if (!chip)
			break;

		clk_enable(chip->clk);

		writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC);
		writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC);

		clk_disable(chip->clk);
	}
}

/*
 * Read the pull up/pull down status.
 * A bit set in 'pull_up' means that pull up
 * is selected if pull is enabled in PDIS register.
 * Note: only pull up/down set via this driver can
 * be detected due to HW limitations.
 */
void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
{
	if (gpio_bank < NUM_BANKS) {
		struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank];

		if (!chip)
			return;

		*pull_up = chip->pull_up;
	}
}

int nmk_gpio_irq_map(struct irq_domain *d, unsigned int irq,
			  irq_hw_number_t hwirq)
{
	struct nmk_gpio_chip *nmk_chip = d->host_data;

	if (!nmk_chip)
		return -EINVAL;

	irq_set_chip_and_handler(irq, &nmk_gpio_irq_chip, handle_edge_irq);
	set_irq_flags(irq, IRQF_VALID);
	irq_set_chip_data(irq, nmk_chip);
	irq_set_irq_type(irq, IRQ_TYPE_EDGE_FALLING);

	return 0;
}

const struct irq_domain_ops nmk_gpio_irq_simple_ops = {
	.map = nmk_gpio_irq_map,
	.xlate = irq_domain_xlate_twocell,
};

static int __devinit nmk_gpio_probe(struct platform_device *dev)
{
	struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
	struct device_node *np = dev->dev.of_node;
	struct nmk_gpio_chip *nmk_chip;
	struct gpio_chip *chip;
	struct resource *res;
	struct clk *clk;
	int secondary_irq;
	void __iomem *base;
	int irq;
	int ret;

	if (!pdata && !np) {
		dev_err(&dev->dev, "No platform data or device tree found\n");
		return -ENODEV;
	}

	if (np) {
		pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;

		if (of_get_property(np, "st,supports-sleepmode", NULL))
			pdata->supports_sleepmode = true;

		if (of_property_read_u32(np, "gpio-bank", &dev->id)) {
			dev_err(&dev->dev, "gpio-bank property not found\n");
			ret = -EINVAL;
			goto out;
		}

		pdata->first_gpio = dev->id * NMK_GPIO_PER_CHIP;
		pdata->num_gpio   = NMK_GPIO_PER_CHIP;
	}

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENOENT;
		goto out;
	}

	irq = platform_get_irq(dev, 0);
	if (irq < 0) {
		ret = irq;
		goto out;
	}

	secondary_irq = platform_get_irq(dev, 1);
	if (secondary_irq >= 0 && !pdata->get_secondary_status) {
		ret = -EINVAL;
		goto out;
	}

	base = devm_request_and_ioremap(&dev->dev, res);
	if (!base) {
		ret = -ENOMEM;
		goto out;
	}

	clk = devm_clk_get(&dev->dev, NULL);
	if (IS_ERR(clk)) {
		ret = PTR_ERR(clk);
		goto out;
	}
	clk_prepare(clk);

	nmk_chip = devm_kzalloc(&dev->dev, sizeof(*nmk_chip), GFP_KERNEL);
	if (!nmk_chip) {
		ret = -ENOMEM;
		goto out;
	}

	/*
	 * The virt address in nmk_chip->addr is in the nomadik register space,
	 * so we can simply convert the resource address, without remapping
	 */
	nmk_chip->bank = dev->id;
	nmk_chip->clk = clk;
	nmk_chip->addr = base;
	nmk_chip->chip = nmk_gpio_template;
	nmk_chip->parent_irq = irq;
	nmk_chip->secondary_parent_irq = secondary_irq;
	nmk_chip->get_secondary_status = pdata->get_secondary_status;
	nmk_chip->set_ioforce = pdata->set_ioforce;
	nmk_chip->sleepmode = pdata->supports_sleepmode;
	spin_lock_init(&nmk_chip->lock);

	chip = &nmk_chip->chip;
	chip->base = pdata->first_gpio;
	chip->ngpio = pdata->num_gpio;
	chip->label = pdata->name ?: dev_name(&dev->dev);
	chip->dev = &dev->dev;
	chip->owner = THIS_MODULE;

	clk_enable(nmk_chip->clk);
	nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI);
	clk_disable(nmk_chip->clk);

#ifdef CONFIG_OF_GPIO
	chip->of_node = np;
#endif

	ret = gpiochip_add(&nmk_chip->chip);
	if (ret)
		goto out;

	BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));

	nmk_gpio_chips[nmk_chip->bank] = nmk_chip;

	platform_set_drvdata(dev, nmk_chip);

	nmk_chip->domain = irq_domain_add_legacy(np, NMK_GPIO_PER_CHIP,
						NOMADIK_GPIO_TO_IRQ(pdata->first_gpio),
						0, &nmk_gpio_irq_simple_ops, nmk_chip);
	if (!nmk_chip->domain) {
		dev_err(&dev->dev, "failed to create irqdomain\n");
		ret = -ENOSYS;
		goto out;
	}

	nmk_gpio_init_irq(nmk_chip);

	dev_info(&dev->dev, "at address %p\n", nmk_chip->addr);

	return 0;

out:
	dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
		  pdata->first_gpio, pdata->first_gpio+31);

	return ret;
}

static int nmk_get_groups_cnt(struct pinctrl_dev *pctldev)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);

	return npct->soc->ngroups;
}

static const char *nmk_get_group_name(struct pinctrl_dev *pctldev,
				       unsigned selector)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);

	return npct->soc->groups[selector].name;
}

static int nmk_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
			      const unsigned **pins,
			      unsigned *num_pins)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);

	*pins = npct->soc->groups[selector].pins;
	*num_pins = npct->soc->groups[selector].npins;
	return 0;
}

static struct pinctrl_gpio_range *
nmk_match_gpio_range(struct pinctrl_dev *pctldev, unsigned offset)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
	int i;

	for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
		struct pinctrl_gpio_range *range;

		range = &npct->soc->gpio_ranges[i];
		if (offset >= range->pin_base &&
		    offset <= (range->pin_base + range->npins - 1))
			return range;
	}
	return NULL;
}

static void nmk_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
		   unsigned offset)
{
	struct pinctrl_gpio_range *range;
	struct gpio_chip *chip;

	range = nmk_match_gpio_range(pctldev, offset);
	if (!range || !range->gc) {
		seq_printf(s, "invalid pin offset");
		return;
	}
	chip = range->gc;
	nmk_gpio_dbg_show_one(s, chip, offset - chip->base, offset);
}

static struct pinctrl_ops nmk_pinctrl_ops = {
	.get_groups_count = nmk_get_groups_cnt,
	.get_group_name = nmk_get_group_name,
	.get_group_pins = nmk_get_group_pins,
	.pin_dbg_show = nmk_pin_dbg_show,
};

static int nmk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);

	return npct->soc->nfunctions;
}

static const char *nmk_pmx_get_func_name(struct pinctrl_dev *pctldev,
					 unsigned function)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);

	return npct->soc->functions[function].name;
}

static int nmk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
				   unsigned function,
				   const char * const **groups,
				   unsigned * const num_groups)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);

	*groups = npct->soc->functions[function].groups;
	*num_groups = npct->soc->functions[function].ngroups;

	return 0;
}

static int nmk_pmx_enable(struct pinctrl_dev *pctldev, unsigned function,
			  unsigned group)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
	const struct nmk_pingroup *g;
	static unsigned int slpm[NUM_BANKS];
	unsigned long flags;
	bool glitch;
	int ret = -EINVAL;
	int i;

	g = &npct->soc->groups[group];

	if (g->altsetting < 0)
		return -EINVAL;

	dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins);

	/*
	 * If we're setting altfunc C by setting both AFSLA and AFSLB to 1,
	 * we may pass through an undesired state. In this case we take
	 * some extra care.
	 *
	 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
	 *  - Save SLPM registers (since we have a shadow register in the
	 *    nmk_chip we're using that as backup)
	 *  - Set SLPM=0 for the IOs you want to switch and others to 1
	 *  - Configure the GPIO registers for the IOs that are being switched
	 *  - Set IOFORCE=1
	 *  - Modify the AFLSA/B registers for the IOs that are being switched
	 *  - Set IOFORCE=0
	 *  - Restore SLPM registers
	 *  - Any spurious wake up event during switch sequence to be ignored
	 *    and cleared
	 *
	 * We REALLY need to save ALL slpm registers, because the external
	 * IOFORCE will switch *all* ports to their sleepmode setting to as
	 * to avoid glitches. (Not just one port!)
	 */
	glitch = (g->altsetting == NMK_GPIO_ALT_C);

	if (glitch) {
		spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);

		/* Initially don't put any pins to sleep when switching */
		memset(slpm, 0xff, sizeof(slpm));

		/*
		 * Then mask the pins that need to be sleeping now when we're
		 * switching to the ALT C function.
		 */
		for (i = 0; i < g->npins; i++)
			slpm[g->pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->pins[i]);
		nmk_gpio_glitch_slpm_init(slpm);
	}

	for (i = 0; i < g->npins; i++) {
		struct pinctrl_gpio_range *range;
		struct nmk_gpio_chip *nmk_chip;
		struct gpio_chip *chip;
		unsigned bit;

		range = nmk_match_gpio_range(pctldev, g->pins[i]);
		if (!range) {
			dev_err(npct->dev,
				"invalid pin offset %d in group %s at index %d\n",
				g->pins[i], g->name, i);
			goto out_glitch;
		}
		if (!range->gc) {
			dev_err(npct->dev, "GPIO chip missing in range for pin offset %d in group %s at index %d\n",
				g->pins[i], g->name, i);
			goto out_glitch;
		}
		chip = range->gc;
		nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
		dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->pins[i], g->altsetting);

		clk_enable(nmk_chip->clk);
		bit = g->pins[i] % NMK_GPIO_PER_CHIP;
		/*
		 * If the pin is switching to altfunc, and there was an
		 * interrupt installed on it which has been lazy disabled,
		 * actually mask the interrupt to prevent spurious interrupts
		 * that would occur while the pin is under control of the
		 * peripheral. Only SKE does this.
		 */
		nmk_gpio_disable_lazy_irq(nmk_chip, bit);

		__nmk_gpio_set_mode_safe(nmk_chip, bit, g->altsetting, glitch);
		clk_disable(nmk_chip->clk);
	}

	/* When all pins are successfully reconfigured we get here */
	ret = 0;

out_glitch:
	if (glitch) {
		nmk_gpio_glitch_slpm_restore(slpm);
		spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
	}

	return ret;
}

static void nmk_pmx_disable(struct pinctrl_dev *pctldev,
			    unsigned function, unsigned group)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
	const struct nmk_pingroup *g;

	g = &npct->soc->groups[group];

	if (g->altsetting < 0)
		return;

	/* Poke out the mux, set the pin to some default state? */
	dev_dbg(npct->dev, "disable group %s, %u pins\n", g->name, g->npins);
}

int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
			    struct pinctrl_gpio_range *range,
			    unsigned offset)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
	struct nmk_gpio_chip *nmk_chip;
	struct gpio_chip *chip;
	unsigned bit;

	if (!range) {
		dev_err(npct->dev, "invalid range\n");
		return -EINVAL;
	}
	if (!range->gc) {
		dev_err(npct->dev, "missing GPIO chip in range\n");
		return -EINVAL;
	}
	chip = range->gc;
	nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);

	dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);

	clk_enable(nmk_chip->clk);
	bit = offset % NMK_GPIO_PER_CHIP;
	/* There is no glitch when converting any pin to GPIO */
	__nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
	clk_disable(nmk_chip->clk);

	return 0;
}

void nmk_gpio_disable_free(struct pinctrl_dev *pctldev,
			   struct pinctrl_gpio_range *range,
			   unsigned offset)
{
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);

	dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
	/* Set the pin to some default state, GPIO is usually default */
}

static struct pinmux_ops nmk_pinmux_ops = {
	.get_functions_count = nmk_pmx_get_funcs_cnt,
	.get_function_name = nmk_pmx_get_func_name,
	.get_function_groups = nmk_pmx_get_func_groups,
	.enable = nmk_pmx_enable,
	.disable = nmk_pmx_disable,
	.gpio_request_enable = nmk_gpio_request_enable,
	.gpio_disable_free = nmk_gpio_disable_free,
};

int nmk_pin_config_get(struct pinctrl_dev *pctldev,
		       unsigned pin,
		       unsigned long *config)
{
	/* Not implemented */
	return -EINVAL;
}

int nmk_pin_config_set(struct pinctrl_dev *pctldev,
		       unsigned pin,
		       unsigned long config)
{
	static const char *pullnames[] = {
		[NMK_GPIO_PULL_NONE]	= "none",
		[NMK_GPIO_PULL_UP]	= "up",
		[NMK_GPIO_PULL_DOWN]	= "down",
		[3] /* illegal */	= "??"
	};
	static const char *slpmnames[] = {
		[NMK_GPIO_SLPM_INPUT]		= "input/wakeup",
		[NMK_GPIO_SLPM_NOCHANGE]	= "no-change/no-wakeup",
	};
	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
	struct nmk_gpio_chip *nmk_chip;
	struct pinctrl_gpio_range *range;
	struct gpio_chip *chip;
	unsigned bit;

	/*
	 * The pin config contains pin number and altfunction fields, here
	 * we just ignore that part. It's being handled by the framework and
	 * pinmux callback respectively.
	 */
	pin_cfg_t cfg = (pin_cfg_t) config;
	int pull = PIN_PULL(cfg);
	int slpm = PIN_SLPM(cfg);
	int output = PIN_DIR(cfg);
	int val = PIN_VAL(cfg);
	bool lowemi = PIN_LOWEMI(cfg);
	bool gpiomode = PIN_GPIOMODE(cfg);
	bool sleep = PIN_SLEEPMODE(cfg);

	range = nmk_match_gpio_range(pctldev, pin);
	if (!range) {
		dev_err(npct->dev, "invalid pin offset %d\n", pin);
		return -EINVAL;
	}
	if (!range->gc) {
		dev_err(npct->dev, "GPIO chip missing in range for pin %d\n",
			pin);
		return -EINVAL;
	}
	chip = range->gc;
	nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);

	if (sleep) {
		int slpm_pull = PIN_SLPM_PULL(cfg);
		int slpm_output = PIN_SLPM_DIR(cfg);
		int slpm_val = PIN_SLPM_VAL(cfg);

		/* All pins go into GPIO mode at sleep */
		gpiomode = true;

		/*
		 * The SLPM_* values are normal values + 1 to allow zero to
		 * mean "same as normal".
		 */
		if (slpm_pull)
			pull = slpm_pull - 1;
		if (slpm_output)
			output = slpm_output - 1;
		if (slpm_val)
			val = slpm_val - 1;

		dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n",
			pin,
			slpm_pull ? pullnames[pull] : "same",
			slpm_output ? (output ? "output" : "input") : "same",
			slpm_val ? (val ? "high" : "low") : "same");
	}

	dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: pull %s, slpm %s (%s%s), lowemi %s\n",
		pin, cfg, pullnames[pull], slpmnames[slpm],
		output ? "output " : "input",
		output ? (val ? "high" : "low") : "",
		lowemi ? "on" : "off" );

	clk_enable(nmk_chip->clk);
	bit = pin % NMK_GPIO_PER_CHIP;
	if (gpiomode)
		/* No glitch when going to GPIO mode */
		__nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
	if (output)
		__nmk_gpio_make_output(nmk_chip, bit, val);
	else {
		__nmk_gpio_make_input(nmk_chip, bit);
		__nmk_gpio_set_pull(nmk_chip, bit, pull);
	}
	/* TODO: isn't this only applicable on output pins? */
	__nmk_gpio_set_lowemi(nmk_chip, bit, lowemi);

	__nmk_gpio_set_slpm(nmk_chip, bit, slpm);
	clk_disable(nmk_chip->clk);
	return 0;
}

static struct pinconf_ops nmk_pinconf_ops = {
	.pin_config_get = nmk_pin_config_get,
	.pin_config_set = nmk_pin_config_set,
};

static struct pinctrl_desc nmk_pinctrl_desc = {
	.name = "pinctrl-nomadik",
	.pctlops = &nmk_pinctrl_ops,
	.pmxops = &nmk_pinmux_ops,
	.confops = &nmk_pinconf_ops,
	.owner = THIS_MODULE,
};

static const struct of_device_id nmk_pinctrl_match[] = {
	{
		.compatible = "stericsson,nmk_pinctrl",
		.data = (void *)PINCTRL_NMK_DB8500,
	},
	{},
};

static int __devinit nmk_pinctrl_probe(struct platform_device *pdev)
{
	const struct platform_device_id *platid = platform_get_device_id(pdev);
	struct device_node *np = pdev->dev.of_node;
	struct nmk_pinctrl *npct;
	unsigned int version = 0;
	int i;

	npct = devm_kzalloc(&pdev->dev, sizeof(*npct), GFP_KERNEL);
	if (!npct)
		return -ENOMEM;

	if (platid)
		version = platid->driver_data;
	else if (np)
		version = (unsigned int)
			of_match_device(nmk_pinctrl_match, &pdev->dev)->data;

	/* Poke in other ASIC variants here */
	if (version == PINCTRL_NMK_DB8500)
		nmk_pinctrl_db8500_init(&npct->soc);

	/*
	 * We need all the GPIO drivers to probe FIRST, or we will not be able
	 * to obtain references to the struct gpio_chip * for them, and we
	 * need this to proceed.
	 */
	for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
		if (!nmk_gpio_chips[i]) {
			dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
			return -EPROBE_DEFER;
		}
		npct->soc->gpio_ranges[i].gc = &nmk_gpio_chips[i]->chip;
	}

	nmk_pinctrl_desc.pins = npct->soc->pins;
	nmk_pinctrl_desc.npins = npct->soc->npins;
	npct->dev = &pdev->dev;
	npct->pctl = pinctrl_register(&nmk_pinctrl_desc, &pdev->dev, npct);
	if (!npct->pctl) {
		dev_err(&pdev->dev, "could not register Nomadik pinctrl driver\n");
		return -EINVAL;
	}

	/* We will handle a range of GPIO pins */
	for (i = 0; i < npct->soc->gpio_num_ranges; i++)
		pinctrl_add_gpio_range(npct->pctl, &npct->soc->gpio_ranges[i]);

	platform_set_drvdata(pdev, npct);
	dev_info(&pdev->dev, "initialized Nomadik pin control driver\n");

	return 0;
}

static const struct of_device_id nmk_gpio_match[] = {
	{ .compatible = "st,nomadik-gpio", },
	{}
};

static struct platform_driver nmk_gpio_driver = {
	.driver = {
		.owner = THIS_MODULE,
		.name = "gpio",
		.of_match_table = nmk_gpio_match,
	},
	.probe = nmk_gpio_probe,
};

static const struct platform_device_id nmk_pinctrl_id[] = {
	{ "pinctrl-stn8815", PINCTRL_NMK_STN8815 },
	{ "pinctrl-db8500", PINCTRL_NMK_DB8500 },
};

static struct platform_driver nmk_pinctrl_driver = {
	.driver = {
		.owner = THIS_MODULE,
		.name = "pinctrl-nomadik",
		.of_match_table = nmk_pinctrl_match,
	},
	.probe = nmk_pinctrl_probe,
	.id_table = nmk_pinctrl_id,
};

static int __init nmk_gpio_init(void)
{
	int ret;

	ret = platform_driver_register(&nmk_gpio_driver);
	if (ret)
		return ret;
	return platform_driver_register(&nmk_pinctrl_driver);
}

core_initcall(nmk_gpio_init);

MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
MODULE_DESCRIPTION("Nomadik GPIO Driver");
MODULE_LICENSE("GPL");