summaryrefslogtreecommitdiff
path: root/drivers/pinctrl/pinctrl-at91-pio4.c
blob: 88ba9c50cc8ed1335078e7a3f7af066bc8f7fece (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
/*
 * Driver for the Atmel PIO4 controller
 *
 * Copyright (C) 2015 Atmel,
 *               2015 Ludovic Desroches <ludovic.desroches@atmel.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/clk.h>
#include <linux/gpio/driver.h>
/* FIXME: needed for gpio_to_irq(), get rid of this */
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"

/*
 * Warning:
 * In order to not introduce confusion between Atmel PIO groups and pinctrl
 * framework groups, Atmel PIO groups will be called banks, line is kept to
 * designed the pin id into this bank.
 */

#define ATMEL_PIO_MSKR		0x0000
#define ATMEL_PIO_CFGR		0x0004
#define		ATMEL_PIO_CFGR_FUNC_MASK	GENMASK(2, 0)
#define		ATMEL_PIO_DIR_MASK		BIT(8)
#define		ATMEL_PIO_PUEN_MASK		BIT(9)
#define		ATMEL_PIO_PDEN_MASK		BIT(10)
#define		ATMEL_PIO_IFEN_MASK		BIT(12)
#define		ATMEL_PIO_IFSCEN_MASK		BIT(13)
#define		ATMEL_PIO_OPD_MASK		BIT(14)
#define		ATMEL_PIO_SCHMITT_MASK		BIT(15)
#define		ATMEL_PIO_CFGR_EVTSEL_MASK	GENMASK(26, 24)
#define		ATMEL_PIO_CFGR_EVTSEL_FALLING	(0 << 24)
#define		ATMEL_PIO_CFGR_EVTSEL_RISING	(1 << 24)
#define		ATMEL_PIO_CFGR_EVTSEL_BOTH	(2 << 24)
#define		ATMEL_PIO_CFGR_EVTSEL_LOW	(3 << 24)
#define		ATMEL_PIO_CFGR_EVTSEL_HIGH	(4 << 24)
#define ATMEL_PIO_PDSR		0x0008
#define ATMEL_PIO_LOCKSR	0x000C
#define ATMEL_PIO_SODR		0x0010
#define ATMEL_PIO_CODR		0x0014
#define ATMEL_PIO_ODSR		0x0018
#define ATMEL_PIO_IER		0x0020
#define ATMEL_PIO_IDR		0x0024
#define ATMEL_PIO_IMR		0x0028
#define ATMEL_PIO_ISR		0x002C
#define ATMEL_PIO_IOFR		0x003C

#define ATMEL_PIO_NPINS_PER_BANK	32
#define ATMEL_PIO_BANK(pin_id)		(pin_id / ATMEL_PIO_NPINS_PER_BANK)
#define ATMEL_PIO_LINE(pin_id)		(pin_id % ATMEL_PIO_NPINS_PER_BANK)
#define ATMEL_PIO_BANK_OFFSET		0x40

#define ATMEL_GET_PIN_NO(pinfunc)	((pinfunc) & 0xff)
#define ATMEL_GET_PIN_FUNC(pinfunc)	((pinfunc >> 16) & 0xf)
#define ATMEL_GET_PIN_IOSET(pinfunc)	((pinfunc >> 20) & 0xf)

struct atmel_pioctrl_data {
	unsigned nbanks;
};

struct atmel_group {
	const char *name;
	u32 pin;
};

struct atmel_pin {
	unsigned pin_id;
	unsigned mux;
	unsigned ioset;
	unsigned bank;
	unsigned line;
	const char *device;
};

/**
 * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio)
 * @reg_base: base address of the controller.
 * @clk: clock of the controller.
 * @nbanks: number of PIO groups, it can vary depending on the SoC.
 * @pinctrl_dev: pinctrl device registered.
 * @groups: groups table to provide group name and pin in the group to pinctrl.
 * @group_names: group names table to provide all the group/pin names to
 *     pinctrl or gpio.
 * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line
 *     fields are set at probe time. Other ones are set when parsing dt
 *     pinctrl.
 * @npins: number of pins.
 * @gpio_chip: gpio chip registered.
 * @irq_domain: irq domain for the gpio controller.
 * @irqs: table containing the hw irq number of the bank. The index of the
 *     table is the bank id.
 * @dev: device entry for the Atmel PIO controller.
 * @node: node of the Atmel PIO controller.
 */
struct atmel_pioctrl {
	void __iomem		*reg_base;
	struct clk		*clk;
	unsigned		nbanks;
	struct pinctrl_dev	*pinctrl_dev;
	struct atmel_group	*groups;
	const char * const	*group_names;
	struct atmel_pin	**pins;
	unsigned		npins;
	struct gpio_chip	*gpio_chip;
	struct irq_domain	*irq_domain;
	int			*irqs;
	unsigned		*pm_wakeup_sources;
	unsigned		*pm_suspend_backup;
	struct device		*dev;
	struct device_node	*node;
};

static const char * const atmel_functions[] = {
	"GPIO", "A", "B", "C", "D", "E", "F", "G"
};

/* --- GPIO --- */
static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl,
				    unsigned int bank, unsigned int reg)
{
	return readl_relaxed(atmel_pioctrl->reg_base
			     + ATMEL_PIO_BANK_OFFSET * bank + reg);
}

static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl,
			     unsigned int bank, unsigned int reg,
			     unsigned int val)
{
	writel_relaxed(val, atmel_pioctrl->reg_base
		       + ATMEL_PIO_BANK_OFFSET * bank + reg);
}

static void atmel_gpio_irq_ack(struct irq_data *d)
{
	/*
	 * Nothing to do, interrupt is cleared when reading the status
	 * register.
	 */
}

static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned type)
{
	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
	struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
	unsigned reg;

	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
			 BIT(pin->line));
	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
	reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		irq_set_handler_locked(d, handle_edge_irq);
		reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		irq_set_handler_locked(d, handle_edge_irq);
		reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		irq_set_handler_locked(d, handle_edge_irq);
		reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		irq_set_handler_locked(d, handle_level_irq);
		reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		irq_set_handler_locked(d, handle_level_irq);
		reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
		break;
	case IRQ_TYPE_NONE:
	default:
		return -EINVAL;
	}

	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);

	return 0;
}

static void atmel_gpio_irq_mask(struct irq_data *d)
{
	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
	struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];

	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR,
			 BIT(pin->line));
}

static void atmel_gpio_irq_unmask(struct irq_data *d)
{
	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
	struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];

	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER,
			 BIT(pin->line));
}

#ifdef CONFIG_PM_SLEEP

static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
{
	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
	int bank = ATMEL_PIO_BANK(d->hwirq);
	int line = ATMEL_PIO_LINE(d->hwirq);

	/* The gpio controller has one interrupt line per bank. */
	irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);

	if (on)
		atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
	else
		atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));

	return 0;
}
#else
#define atmel_gpio_irq_set_wake NULL
#endif /* CONFIG_PM_SLEEP */

static struct irq_chip atmel_gpio_irq_chip = {
	.name		= "GPIO",
	.irq_ack	= atmel_gpio_irq_ack,
	.irq_mask	= atmel_gpio_irq_mask,
	.irq_unmask	= atmel_gpio_irq_unmask,
	.irq_set_type	= atmel_gpio_irq_set_type,
	.irq_set_wake	= atmel_gpio_irq_set_wake,
};

static void atmel_gpio_irq_handler(struct irq_desc *desc)
{
	unsigned int irq = irq_desc_get_irq(desc);
	struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
	struct irq_chip *chip = irq_desc_get_chip(desc);
	unsigned long isr;
	int n, bank = -1;

	/* Find from which bank is the irq received. */
	for (n = 0; n < atmel_pioctrl->nbanks; n++) {
		if (atmel_pioctrl->irqs[n] == irq) {
			bank = n;
			break;
		}
	}

	if (bank < 0) {
		dev_err(atmel_pioctrl->dev,
			"no bank associated to irq %u\n", irq);
		return;
	}

	chained_irq_enter(chip, desc);

	for (;;) {
		isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
						     ATMEL_PIO_ISR);
		isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
						      ATMEL_PIO_IMR);
		if (!isr)
			break;

		for_each_set_bit(n, &isr, BITS_PER_LONG)
			generic_handle_irq(gpio_to_irq(bank *
					ATMEL_PIO_NPINS_PER_BANK + n));
	}

	chained_irq_exit(chip, desc);
}

static int atmel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
	struct atmel_pin *pin = atmel_pioctrl->pins[offset];
	unsigned reg;

	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
			 BIT(pin->line));
	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
	reg &= ~ATMEL_PIO_DIR_MASK;
	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);

	return 0;
}

static int atmel_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
	struct atmel_pin *pin = atmel_pioctrl->pins[offset];
	unsigned reg;

	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);

	return !!(reg & BIT(pin->line));
}

static int atmel_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
				       int value)
{
	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
	struct atmel_pin *pin = atmel_pioctrl->pins[offset];
	unsigned reg;

	atmel_gpio_write(atmel_pioctrl, pin->bank,
			 value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
			 BIT(pin->line));

	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
			 BIT(pin->line));
	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
	reg |= ATMEL_PIO_DIR_MASK;
	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);

	return 0;
}

static void atmel_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
	struct atmel_pin *pin = atmel_pioctrl->pins[offset];

	atmel_gpio_write(atmel_pioctrl, pin->bank,
			 val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
			 BIT(pin->line));
}

static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);

	return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
}

static struct gpio_chip atmel_gpio_chip = {
	.direction_input        = atmel_gpio_direction_input,
	.get                    = atmel_gpio_get,
	.direction_output       = atmel_gpio_direction_output,
	.set                    = atmel_gpio_set,
	.to_irq                 = atmel_gpio_to_irq,
	.base                   = 0,
};

/* --- PINCTRL --- */
static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
					  unsigned pin_id)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
	unsigned line = atmel_pioctrl->pins[pin_id]->line;
	void __iomem *addr = atmel_pioctrl->reg_base
			     + bank * ATMEL_PIO_BANK_OFFSET;

	writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
	/* Have to set MSKR first, to access the right pin CFGR. */
	wmb();

	return readl_relaxed(addr + ATMEL_PIO_CFGR);
}

static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
				   unsigned pin_id, u32 conf)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
	unsigned line = atmel_pioctrl->pins[pin_id]->line;
	void __iomem *addr = atmel_pioctrl->reg_base
			     + bank * ATMEL_PIO_BANK_OFFSET;

	writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
	/* Have to set MSKR first, to access the right pin CFGR. */
	wmb();
	writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
}

static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);

	return atmel_pioctrl->npins;
}

static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
					     unsigned selector)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);

	return atmel_pioctrl->groups[selector].name;
}

static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
				     unsigned selector, const unsigned **pins,
				     unsigned *num_pins)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);

	*pins = (unsigned *)&atmel_pioctrl->groups[selector].pin;
	*num_pins = 1;

	return 0;
}

static struct atmel_group *
atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned pin)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	int i;

	for (i = 0; i < atmel_pioctrl->npins; i++) {
		struct atmel_group *grp = atmel_pioctrl->groups + i;

		if (grp->pin == pin)
			return grp;
	}

	return NULL;
}

static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
				    struct device_node *np,
				    u32 pinfunc, const char **grp_name,
				    const char **func_name)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	unsigned pin_id, func_id;
	struct atmel_group *grp;

	pin_id = ATMEL_GET_PIN_NO(pinfunc);
	func_id = ATMEL_GET_PIN_FUNC(pinfunc);

	if (func_id >= ARRAY_SIZE(atmel_functions))
		return -EINVAL;

	*func_name = atmel_functions[func_id];

	grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
	if (!grp)
		return -EINVAL;
	*grp_name = grp->name;

	atmel_pioctrl->pins[pin_id]->mux = func_id;
	atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
	/* Want the device name not the group one. */
	if (np->parent == atmel_pioctrl->node)
		atmel_pioctrl->pins[pin_id]->device = np->name;
	else
		atmel_pioctrl->pins[pin_id]->device = np->parent->name;

	return 0;
}

static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
					struct device_node *np,
					struct pinctrl_map **map,
					unsigned *reserved_maps,
					unsigned *num_maps)
{
	unsigned num_pins, num_configs, reserve;
	unsigned long *configs;
	struct property	*pins;
	bool has_config;
	u32 pinfunc;
	int ret, i;

	pins = of_find_property(np, "pinmux", NULL);
	if (!pins)
		return -EINVAL;

	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
					      &num_configs);
	if (ret < 0) {
		dev_err(pctldev->dev, "%s: could not parse node property\n",
			of_node_full_name(np));
		return ret;
	}

	if (num_configs)
		has_config = true;

	num_pins = pins->length / sizeof(u32);
	if (!num_pins) {
		dev_err(pctldev->dev, "no pins found in node %s\n",
			of_node_full_name(np));
		ret = -EINVAL;
		goto exit;
	}

	/*
	 * Reserve maps, at least there is a mux map and an optional conf
	 * map for each pin.
	 */
	reserve = 1;
	if (has_config && num_pins >= 1)
		reserve++;
	reserve *= num_pins;
	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
					reserve);
	if (ret < 0)
		goto exit;

	for (i = 0; i < num_pins; i++) {
		const char *group, *func;

		ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
		if (ret)
			goto exit;

		ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
					       &func);
		if (ret)
			goto exit;

		pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
					  group, func);

		if (has_config) {
			ret = pinctrl_utils_add_map_configs(pctldev, map,
					reserved_maps, num_maps, group,
					configs, num_configs,
					PIN_MAP_TYPE_CONFIGS_GROUP);
			if (ret < 0)
				goto exit;
		}
	}

exit:
	kfree(configs);
	return ret;
}

static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
				     struct device_node *np_config,
				     struct pinctrl_map **map,
				     unsigned *num_maps)
{
	struct device_node *np;
	unsigned reserved_maps;
	int ret;

	*map = NULL;
	*num_maps = 0;
	reserved_maps = 0;

	/*
	 * If all the pins of a device have the same configuration (or no one),
	 * it is useless to add a subnode, so directly parse node referenced by
	 * phandle.
	 */
	ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
					   &reserved_maps, num_maps);
	if (ret) {
		for_each_child_of_node(np_config, np) {
			ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
						    &reserved_maps, num_maps);
			if (ret < 0) {
				of_node_put(np);
				break;
			}
		}
	}

	if (ret < 0) {
		pinctrl_utils_free_map(pctldev, *map, *num_maps);
		dev_err(pctldev->dev, "can't create maps for node %s\n",
			np_config->full_name);
	}

	return ret;
}

static const struct pinctrl_ops atmel_pctlops = {
	.get_groups_count	= atmel_pctl_get_groups_count,
	.get_group_name		= atmel_pctl_get_group_name,
	.get_group_pins		= atmel_pctl_get_group_pins,
	.dt_node_to_map		= atmel_pctl_dt_node_to_map,
	.dt_free_map		= pinctrl_utils_free_map,
};

static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
{
	return ARRAY_SIZE(atmel_functions);
}

static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
					       unsigned selector)
{
	return atmel_functions[selector];
}

static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
					 unsigned selector,
					 const char * const **groups,
					 unsigned * const num_groups)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);

	*groups = atmel_pioctrl->group_names;
	*num_groups = atmel_pioctrl->npins;

	return 0;
}

static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
			     unsigned function,
			     unsigned group)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	unsigned pin;
	u32 conf;

	dev_dbg(pctldev->dev, "enable function %s group %s\n",
		atmel_functions[function], atmel_pioctrl->groups[group].name);

	pin = atmel_pioctrl->groups[group].pin;
	conf = atmel_pin_config_read(pctldev, pin);
	conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
	conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
	dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
	atmel_pin_config_write(pctldev, pin, conf);

	return 0;
}

static const struct pinmux_ops atmel_pmxops = {
	.get_functions_count	= atmel_pmx_get_functions_count,
	.get_function_name	= atmel_pmx_get_function_name,
	.get_function_groups	= atmel_pmx_get_function_groups,
	.set_mux		= atmel_pmx_set_mux,
};

static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
					   unsigned group,
					   unsigned long *config)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	unsigned param = pinconf_to_config_param(*config), arg = 0;
	struct atmel_group *grp = atmel_pioctrl->groups + group;
	unsigned pin_id = grp->pin;
	u32 res;

	res = atmel_pin_config_read(pctldev, pin_id);

	switch (param) {
	case PIN_CONFIG_BIAS_PULL_UP:
		if (!(res & ATMEL_PIO_PUEN_MASK))
			return -EINVAL;
		arg = 1;
		break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
		if ((res & ATMEL_PIO_PUEN_MASK) ||
		    (!(res & ATMEL_PIO_PDEN_MASK)))
			return -EINVAL;
		arg = 1;
		break;
	case PIN_CONFIG_BIAS_DISABLE:
		if ((res & ATMEL_PIO_PUEN_MASK) ||
		    ((res & ATMEL_PIO_PDEN_MASK)))
			return -EINVAL;
		arg = 1;
		break;
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		if (!(res & ATMEL_PIO_OPD_MASK))
			return -EINVAL;
		arg = 1;
		break;
	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
		if (!(res & ATMEL_PIO_SCHMITT_MASK))
			return -EINVAL;
		arg = 1;
		break;
	default:
		return -ENOTSUPP;
	}

	*config = pinconf_to_config_packed(param, arg);
	return 0;
}

static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
					   unsigned group,
					   unsigned long *configs,
					   unsigned num_configs)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	struct atmel_group *grp = atmel_pioctrl->groups + group;
	unsigned bank, pin, pin_id = grp->pin;
	u32 mask, conf = 0;
	int i;

	conf = atmel_pin_config_read(pctldev, pin_id);

	for (i = 0; i < num_configs; i++) {
		unsigned param = pinconf_to_config_param(configs[i]);
		unsigned arg = pinconf_to_config_argument(configs[i]);

		dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
			__func__, pin_id, configs[i]);

		switch (param) {
		case PIN_CONFIG_BIAS_DISABLE:
			conf &= (~ATMEL_PIO_PUEN_MASK);
			conf &= (~ATMEL_PIO_PDEN_MASK);
			break;
		case PIN_CONFIG_BIAS_PULL_UP:
			conf |= ATMEL_PIO_PUEN_MASK;
			conf &= (~ATMEL_PIO_PDEN_MASK);
			break;
		case PIN_CONFIG_BIAS_PULL_DOWN:
			conf |= ATMEL_PIO_PDEN_MASK;
			conf &= (~ATMEL_PIO_PUEN_MASK);
			break;
		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
			if (arg == 0)
				conf &= (~ATMEL_PIO_OPD_MASK);
			else
				conf |= ATMEL_PIO_OPD_MASK;
			break;
		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
			if (arg == 0)
				conf |= ATMEL_PIO_SCHMITT_MASK;
			else
				conf &= (~ATMEL_PIO_SCHMITT_MASK);
			break;
		case PIN_CONFIG_INPUT_DEBOUNCE:
			if (arg == 0) {
				conf &= (~ATMEL_PIO_IFEN_MASK);
				conf &= (~ATMEL_PIO_IFSCEN_MASK);
			} else {
				/*
				 * We don't care about the debounce value for several reasons:
				 * - can't have different debounce periods inside a same group,
				 * - the register to configure this period is a secure register.
				 * The debouncing filter can filter a pulse with a duration of less
				 * than 1/2 slow clock period.
				 */
				conf |= ATMEL_PIO_IFEN_MASK;
				conf |= ATMEL_PIO_IFSCEN_MASK;
			}
			break;
		case PIN_CONFIG_OUTPUT:
			conf |= ATMEL_PIO_DIR_MASK;
			bank = ATMEL_PIO_BANK(pin_id);
			pin = ATMEL_PIO_LINE(pin_id);
			mask = 1 << pin;

			if (arg == 0) {
				writel_relaxed(mask, atmel_pioctrl->reg_base +
					bank * ATMEL_PIO_BANK_OFFSET +
					ATMEL_PIO_CODR);
			} else {
				writel_relaxed(mask, atmel_pioctrl->reg_base +
					bank * ATMEL_PIO_BANK_OFFSET +
					ATMEL_PIO_SODR);
			}
			break;
		default:
			dev_warn(pctldev->dev,
				 "unsupported configuration parameter: %u\n",
				 param);
			continue;
		}
	}

	dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
	atmel_pin_config_write(pctldev, pin_id, conf);

	return 0;
}

static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
					   struct seq_file *s, unsigned pin_id)
{
	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
	u32 conf;

	if (!atmel_pioctrl->pins[pin_id]->device)
		return;

	if (atmel_pioctrl->pins[pin_id])
		seq_printf(s, " (%s, ioset %u) ",
			   atmel_pioctrl->pins[pin_id]->device,
			   atmel_pioctrl->pins[pin_id]->ioset);

	conf = atmel_pin_config_read(pctldev, pin_id);
	if (conf & ATMEL_PIO_PUEN_MASK)
		seq_printf(s, "%s ", "pull-up");
	if (conf & ATMEL_PIO_PDEN_MASK)
		seq_printf(s, "%s ", "pull-down");
	if (conf & ATMEL_PIO_IFEN_MASK)
		seq_printf(s, "%s ", "debounce");
	if (conf & ATMEL_PIO_OPD_MASK)
		seq_printf(s, "%s ", "open-drain");
	if (conf & ATMEL_PIO_SCHMITT_MASK)
		seq_printf(s, "%s ", "schmitt");
}

static const struct pinconf_ops atmel_confops = {
	.pin_config_group_get	= atmel_conf_pin_config_group_get,
	.pin_config_group_set	= atmel_conf_pin_config_group_set,
	.pin_config_dbg_show	= atmel_conf_pin_config_dbg_show,
};

static struct pinctrl_desc atmel_pinctrl_desc = {
	.name		= "atmel_pinctrl",
	.confops	= &atmel_confops,
	.pctlops	= &atmel_pctlops,
	.pmxops		= &atmel_pmxops,
};

static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
	int i;

	/*
	 * For each bank, save IMR to restore it later and disable all GPIO
	 * interrupts excepting the ones marked as wakeup sources.
	 */
	for (i = 0; i < atmel_pioctrl->nbanks; i++) {
		atmel_pioctrl->pm_suspend_backup[i] =
			atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
		atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
				 ~atmel_pioctrl->pm_wakeup_sources[i]);
	}

	return 0;
}

static int __maybe_unused atmel_pctrl_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < atmel_pioctrl->nbanks; i++)
		atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
				 atmel_pioctrl->pm_suspend_backup[i]);

	return 0;
}

static const struct dev_pm_ops atmel_pctrl_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
};

/*
 * The number of banks can be different from a SoC to another one.
 * We can have up to 16 banks.
 */
static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
	.nbanks		= 4,
};

static const struct of_device_id atmel_pctrl_of_match[] = {
	{
		.compatible = "atmel,sama5d2-pinctrl",
		.data = &atmel_sama5d2_pioctrl_data,
	}, {
		/* sentinel */
	}
};

static int atmel_pinctrl_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct pinctrl_pin_desc	*pin_desc;
	const char **group_names;
	const struct of_device_id *match;
	int i, ret;
	struct resource	*res;
	struct atmel_pioctrl *atmel_pioctrl;
	struct atmel_pioctrl_data *atmel_pioctrl_data;

	atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
	if (!atmel_pioctrl)
		return -ENOMEM;
	atmel_pioctrl->dev = dev;
	atmel_pioctrl->node = dev->of_node;
	platform_set_drvdata(pdev, atmel_pioctrl);

	match = of_match_node(atmel_pctrl_of_match, dev->of_node);
	if (!match) {
		dev_err(dev, "unknown compatible string\n");
		return -ENODEV;
	}
	atmel_pioctrl_data = (struct atmel_pioctrl_data *)match->data;
	atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
	atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(dev, "unable to get atmel pinctrl resource\n");
		return -EINVAL;
	}
	atmel_pioctrl->reg_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(atmel_pioctrl->reg_base))
		return -EINVAL;

	atmel_pioctrl->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(atmel_pioctrl->clk)) {
		dev_err(dev, "failed to get clock\n");
		return PTR_ERR(atmel_pioctrl->clk);
	}

	atmel_pioctrl->pins = devm_kzalloc(dev, sizeof(*atmel_pioctrl->pins)
			* atmel_pioctrl->npins, GFP_KERNEL);
	if (!atmel_pioctrl->pins)
		return -ENOMEM;

	pin_desc = devm_kzalloc(dev, sizeof(*pin_desc)
			* atmel_pioctrl->npins, GFP_KERNEL);
	if (!pin_desc)
		return -ENOMEM;
	atmel_pinctrl_desc.pins = pin_desc;
	atmel_pinctrl_desc.npins = atmel_pioctrl->npins;

	/* One pin is one group since a pin can achieve all functions. */
	group_names = devm_kzalloc(dev, sizeof(*group_names)
			* atmel_pioctrl->npins, GFP_KERNEL);
	if (!group_names)
		return -ENOMEM;
	atmel_pioctrl->group_names = group_names;

	atmel_pioctrl->groups = devm_kzalloc(&pdev->dev,
			sizeof(*atmel_pioctrl->groups) * atmel_pioctrl->npins,
			GFP_KERNEL);
	if (!atmel_pioctrl->groups)
		return -ENOMEM;
	for (i = 0 ; i < atmel_pioctrl->npins; i++) {
		struct atmel_group *group = atmel_pioctrl->groups + i;
		unsigned bank = ATMEL_PIO_BANK(i);
		unsigned line = ATMEL_PIO_LINE(i);

		atmel_pioctrl->pins[i] = devm_kzalloc(dev,
				sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
		if (!atmel_pioctrl->pins[i])
			return -ENOMEM;

		atmel_pioctrl->pins[i]->pin_id = i;
		atmel_pioctrl->pins[i]->bank = bank;
		atmel_pioctrl->pins[i]->line = line;

		pin_desc[i].number = i;
		/* Pin naming convention: P(bank_name)(bank_pin_number). */
		pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
					     bank + 'A', line);

		group->name = group_names[i] = pin_desc[i].name;
		group->pin = pin_desc[i].number;

		dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
	}

	atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
	atmel_pioctrl->gpio_chip->of_node = dev->of_node;
	atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
	atmel_pioctrl->gpio_chip->label = dev_name(dev);
	atmel_pioctrl->gpio_chip->parent = dev;
	atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;

	atmel_pioctrl->pm_wakeup_sources = devm_kzalloc(dev,
			sizeof(*atmel_pioctrl->pm_wakeup_sources)
			* atmel_pioctrl->nbanks, GFP_KERNEL);
	if (!atmel_pioctrl->pm_wakeup_sources)
		return -ENOMEM;

	atmel_pioctrl->pm_suspend_backup = devm_kzalloc(dev,
			sizeof(*atmel_pioctrl->pm_suspend_backup)
			* atmel_pioctrl->nbanks, GFP_KERNEL);
	if (!atmel_pioctrl->pm_suspend_backup)
		return -ENOMEM;

	atmel_pioctrl->irqs = devm_kzalloc(dev, sizeof(*atmel_pioctrl->irqs)
			* atmel_pioctrl->nbanks, GFP_KERNEL);
	if (!atmel_pioctrl->irqs)
		return -ENOMEM;

	/* There is one controller but each bank has its own irq line. */
	for (i = 0; i < atmel_pioctrl->nbanks; i++) {
		res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
		if (!res) {
			dev_err(dev, "missing irq resource for group %c\n",
				'A' + i);
			return -EINVAL;
		}
		atmel_pioctrl->irqs[i] = res->start;
		irq_set_chained_handler(res->start, atmel_gpio_irq_handler);
		irq_set_handler_data(res->start, atmel_pioctrl);
		dev_dbg(dev, "bank %i: irq=%pr\n", i, res);
	}

	atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
			atmel_pioctrl->gpio_chip->ngpio,
			&irq_domain_simple_ops, NULL);
	if (!atmel_pioctrl->irq_domain) {
		dev_err(dev, "can't add the irq domain\n");
		return -ENODEV;
	}
	atmel_pioctrl->irq_domain->name = "atmel gpio";

	for (i = 0; i < atmel_pioctrl->npins; i++) {
		int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);

		irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
					 handle_simple_irq);
		irq_set_chip_data(irq, atmel_pioctrl);
		dev_dbg(dev,
			"atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
			i, irq);
	}

	ret = clk_prepare_enable(atmel_pioctrl->clk);
	if (ret) {
		dev_err(dev, "failed to prepare and enable clock\n");
		goto clk_prepare_enable_error;
	}

	atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
							   &atmel_pinctrl_desc,
							   atmel_pioctrl);
	if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
		ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
		dev_err(dev, "pinctrl registration failed\n");
		goto clk_unprep;
	}

	ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
	if (ret) {
		dev_err(dev, "failed to add gpiochip\n");
		goto clk_unprep;
	}

	ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
				     0, 0, atmel_pioctrl->gpio_chip->ngpio);
	if (ret) {
		dev_err(dev, "failed to add gpio pin range\n");
		goto gpiochip_add_pin_range_error;
	}

	dev_info(&pdev->dev, "atmel pinctrl initialized\n");

	return 0;

gpiochip_add_pin_range_error:
	gpiochip_remove(atmel_pioctrl->gpio_chip);

clk_unprep:
	clk_disable_unprepare(atmel_pioctrl->clk);

clk_prepare_enable_error:
	irq_domain_remove(atmel_pioctrl->irq_domain);

	return ret;
}

static struct platform_driver atmel_pinctrl_driver = {
	.driver = {
		.name = "pinctrl-at91-pio4",
		.of_match_table = atmel_pctrl_of_match,
		.pm = &atmel_pctrl_pm_ops,
		.suppress_bind_attrs = true,
	},
	.probe = atmel_pinctrl_probe,
};
builtin_platform_driver(atmel_pinctrl_driver);