summaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-tegra186.c
blob: c99858f40a27ea1e3a6b98913f59a6fd732d20e4 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2016-2017 NVIDIA Corporation
 *
 * Author: Thierry Reding <treding@nvidia.com>
 */

#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

#include <dt-bindings/gpio/tegra186-gpio.h>
#include <dt-bindings/gpio/tegra194-gpio.h>

/* security registers */
#define TEGRA186_GPIO_CTL_SCR 0x0c
#define  TEGRA186_GPIO_CTL_SCR_SEC_WEN BIT(28)
#define  TEGRA186_GPIO_CTL_SCR_SEC_REN BIT(27)

#define TEGRA186_GPIO_INT_ROUTE_MAPPING(p, x) (0x14 + (p) * 0x20 + (x) * 4)

/* control registers */
#define TEGRA186_GPIO_ENABLE_CONFIG 0x00
#define  TEGRA186_GPIO_ENABLE_CONFIG_ENABLE BIT(0)
#define  TEGRA186_GPIO_ENABLE_CONFIG_OUT BIT(1)
#define  TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_NONE (0x0 << 2)
#define  TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL (0x1 << 2)
#define  TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE (0x2 << 2)
#define  TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE (0x3 << 2)
#define  TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK (0x3 << 2)
#define  TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL BIT(4)
#define  TEGRA186_GPIO_ENABLE_CONFIG_DEBOUNCE BIT(5)
#define  TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT BIT(6)

#define TEGRA186_GPIO_DEBOUNCE_CONTROL 0x04
#define  TEGRA186_GPIO_DEBOUNCE_CONTROL_THRESHOLD(x) ((x) & 0xff)

#define TEGRA186_GPIO_INPUT 0x08
#define  TEGRA186_GPIO_INPUT_HIGH BIT(0)

#define TEGRA186_GPIO_OUTPUT_CONTROL 0x0c
#define  TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED BIT(0)

#define TEGRA186_GPIO_OUTPUT_VALUE 0x10
#define  TEGRA186_GPIO_OUTPUT_VALUE_HIGH BIT(0)

#define TEGRA186_GPIO_INTERRUPT_CLEAR 0x14

#define TEGRA186_GPIO_INTERRUPT_STATUS(x) (0x100 + (x) * 4)

struct tegra_gpio_port {
	const char *name;
	unsigned int bank;
	unsigned int port;
	unsigned int pins;
};

struct tegra186_pin_range {
	unsigned int offset;
	const char *group;
};

struct tegra_gpio_soc {
	const struct tegra_gpio_port *ports;
	unsigned int num_ports;
	const char *name;
	unsigned int instance;

	const struct tegra186_pin_range *pin_ranges;
	unsigned int num_pin_ranges;
	const char *pinmux;
};

struct tegra_gpio {
	struct gpio_chip gpio;
	struct irq_chip intc;
	unsigned int num_irq;
	unsigned int *irq;

	const struct tegra_gpio_soc *soc;

	void __iomem *secure;
	void __iomem *base;
};

static const struct tegra_gpio_port *
tegra186_gpio_get_port(struct tegra_gpio *gpio, unsigned int *pin)
{
	unsigned int start = 0, i;

	for (i = 0; i < gpio->soc->num_ports; i++) {
		const struct tegra_gpio_port *port = &gpio->soc->ports[i];

		if (*pin >= start && *pin < start + port->pins) {
			*pin -= start;
			return port;
		}

		start += port->pins;
	}

	return NULL;
}

static void __iomem *tegra186_gpio_get_base(struct tegra_gpio *gpio,
					    unsigned int pin)
{
	const struct tegra_gpio_port *port;
	unsigned int offset;

	port = tegra186_gpio_get_port(gpio, &pin);
	if (!port)
		return NULL;

	offset = port->bank * 0x1000 + port->port * 0x200;

	return gpio->base + offset + pin * 0x20;
}

static int tegra186_gpio_get_direction(struct gpio_chip *chip,
				       unsigned int offset)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	void __iomem *base;
	u32 value;

	base = tegra186_gpio_get_base(gpio, offset);
	if (WARN_ON(base == NULL))
		return -ENODEV;

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	if (value & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
		return GPIO_LINE_DIRECTION_OUT;

	return GPIO_LINE_DIRECTION_IN;
}

static int tegra186_gpio_direction_input(struct gpio_chip *chip,
					 unsigned int offset)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	void __iomem *base;
	u32 value;

	base = tegra186_gpio_get_base(gpio, offset);
	if (WARN_ON(base == NULL))
		return -ENODEV;

	value = readl(base + TEGRA186_GPIO_OUTPUT_CONTROL);
	value |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	writel(value, base + TEGRA186_GPIO_OUTPUT_CONTROL);

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	value |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
	value &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);

	return 0;
}

static int tegra186_gpio_direction_output(struct gpio_chip *chip,
					  unsigned int offset, int level)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	void __iomem *base;
	u32 value;

	/* configure output level first */
	chip->set(chip, offset, level);

	base = tegra186_gpio_get_base(gpio, offset);
	if (WARN_ON(base == NULL))
		return -EINVAL;

	/* set the direction */
	value = readl(base + TEGRA186_GPIO_OUTPUT_CONTROL);
	value &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	writel(value, base + TEGRA186_GPIO_OUTPUT_CONTROL);

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	value |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
	value |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);

	return 0;
}

static int tegra186_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	void __iomem *base;
	u32 value;

	base = tegra186_gpio_get_base(gpio, offset);
	if (WARN_ON(base == NULL))
		return -ENODEV;

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	if (value & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
		value = readl(base + TEGRA186_GPIO_OUTPUT_VALUE);
	else
		value = readl(base + TEGRA186_GPIO_INPUT);

	return value & BIT(0);
}

static void tegra186_gpio_set(struct gpio_chip *chip, unsigned int offset,
			      int level)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	void __iomem *base;
	u32 value;

	base = tegra186_gpio_get_base(gpio, offset);
	if (WARN_ON(base == NULL))
		return;

	value = readl(base + TEGRA186_GPIO_OUTPUT_VALUE);
	if (level == 0)
		value &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
	else
		value |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;

	writel(value, base + TEGRA186_GPIO_OUTPUT_VALUE);
}

static int tegra186_gpio_set_config(struct gpio_chip *chip,
				    unsigned int offset,
				    unsigned long config)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	u32 debounce, value;
	void __iomem *base;

	base = tegra186_gpio_get_base(gpio, offset);
	if (base == NULL)
		return -ENXIO;

	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
		return -ENOTSUPP;

	debounce = pinconf_to_config_argument(config);

	/*
	 * The Tegra186 GPIO controller supports a maximum of 255 ms debounce
	 * time.
	 */
	if (debounce > 255000)
		return -EINVAL;

	debounce = DIV_ROUND_UP(debounce, USEC_PER_MSEC);

	value = TEGRA186_GPIO_DEBOUNCE_CONTROL_THRESHOLD(debounce);
	writel(value, base + TEGRA186_GPIO_DEBOUNCE_CONTROL);

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	value |= TEGRA186_GPIO_ENABLE_CONFIG_DEBOUNCE;
	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);

	return 0;
}

static int tegra186_gpio_add_pin_ranges(struct gpio_chip *chip)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	struct pinctrl_dev *pctldev;
	struct device_node *np;
	unsigned int i, j;
	int err;

	if (!gpio->soc->pinmux || gpio->soc->num_pin_ranges == 0)
		return 0;

	np = of_find_compatible_node(NULL, NULL, gpio->soc->pinmux);
	if (!np)
		return -ENODEV;

	pctldev = of_pinctrl_get(np);
	of_node_put(np);
	if (!pctldev)
		return -EPROBE_DEFER;

	for (i = 0; i < gpio->soc->num_pin_ranges; i++) {
		unsigned int pin = gpio->soc->pin_ranges[i].offset, port;
		const char *group = gpio->soc->pin_ranges[i].group;

		port = pin / 8;
		pin = pin % 8;

		if (port >= gpio->soc->num_ports) {
			dev_warn(chip->parent, "invalid port %u for %s\n",
				 port, group);
			continue;
		}

		for (j = 0; j < port; j++)
			pin += gpio->soc->ports[j].pins;

		err = gpiochip_add_pingroup_range(chip, pctldev, pin, group);
		if (err < 0)
			return err;
	}

	return 0;
}

static int tegra186_gpio_of_xlate(struct gpio_chip *chip,
				  const struct of_phandle_args *spec,
				  u32 *flags)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	unsigned int port, pin, i, offset = 0;

	if (WARN_ON(chip->of_gpio_n_cells < 2))
		return -EINVAL;

	if (WARN_ON(spec->args_count < chip->of_gpio_n_cells))
		return -EINVAL;

	port = spec->args[0] / 8;
	pin = spec->args[0] % 8;

	if (port >= gpio->soc->num_ports) {
		dev_err(chip->parent, "invalid port number: %u\n", port);
		return -EINVAL;
	}

	for (i = 0; i < port; i++)
		offset += gpio->soc->ports[i].pins;

	if (flags)
		*flags = spec->args[1];

	return offset + pin;
}

static void tegra186_irq_ack(struct irq_data *data)
{
	struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
	void __iomem *base;

	base = tegra186_gpio_get_base(gpio, data->hwirq);
	if (WARN_ON(base == NULL))
		return;

	writel(1, base + TEGRA186_GPIO_INTERRUPT_CLEAR);
}

static void tegra186_irq_mask(struct irq_data *data)
{
	struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
	void __iomem *base;
	u32 value;

	base = tegra186_gpio_get_base(gpio, data->hwirq);
	if (WARN_ON(base == NULL))
		return;

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	value &= ~TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
}

static void tegra186_irq_unmask(struct irq_data *data)
{
	struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
	void __iomem *base;
	u32 value;

	base = tegra186_gpio_get_base(gpio, data->hwirq);
	if (WARN_ON(base == NULL))
		return;

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	value |= TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
}

static int tegra186_irq_set_type(struct irq_data *data, unsigned int type)
{
	struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
	void __iomem *base;
	u32 value;

	base = tegra186_gpio_get_base(gpio, data->hwirq);
	if (WARN_ON(base == NULL))
		return -ENODEV;

	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
	value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK;
	value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;

	switch (type & IRQ_TYPE_SENSE_MASK) {
	case IRQ_TYPE_NONE:
		break;

	case IRQ_TYPE_EDGE_RISING:
		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
		break;

	case IRQ_TYPE_EDGE_FALLING:
		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
		break;

	case IRQ_TYPE_EDGE_BOTH:
		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE;
		break;

	case IRQ_TYPE_LEVEL_HIGH:
		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL;
		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
		break;

	case IRQ_TYPE_LEVEL_LOW:
		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL;
		break;

	default:
		return -EINVAL;
	}

	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);

	if ((type & IRQ_TYPE_EDGE_BOTH) == 0)
		irq_set_handler_locked(data, handle_level_irq);
	else
		irq_set_handler_locked(data, handle_edge_irq);

	if (data->parent_data)
		return irq_chip_set_type_parent(data, type);

	return 0;
}

static int tegra186_irq_set_wake(struct irq_data *data, unsigned int on)
{
	if (data->parent_data)
		return irq_chip_set_wake_parent(data, on);

	return 0;
}

static void tegra186_gpio_irq(struct irq_desc *desc)
{
	struct tegra_gpio *gpio = irq_desc_get_handler_data(desc);
	struct irq_domain *domain = gpio->gpio.irq.domain;
	struct irq_chip *chip = irq_desc_get_chip(desc);
	unsigned int parent = irq_desc_get_irq(desc);
	unsigned int i, offset = 0;

	chained_irq_enter(chip, desc);

	for (i = 0; i < gpio->soc->num_ports; i++) {
		const struct tegra_gpio_port *port = &gpio->soc->ports[i];
		unsigned int pin;
		unsigned long value;
		void __iomem *base;

		base = gpio->base + port->bank * 0x1000 + port->port * 0x200;

		/* skip ports that are not associated with this bank */
		if (parent != gpio->irq[port->bank])
			goto skip;

		value = readl(base + TEGRA186_GPIO_INTERRUPT_STATUS(1));

		for_each_set_bit(pin, &value, port->pins) {
			int ret = generic_handle_domain_irq(domain, offset + pin);
			WARN_RATELIMIT(ret, "hwirq = %d", offset + pin);
		}

skip:
		offset += port->pins;
	}

	chained_irq_exit(chip, desc);
}

static int tegra186_gpio_irq_domain_translate(struct irq_domain *domain,
					      struct irq_fwspec *fwspec,
					      unsigned long *hwirq,
					      unsigned int *type)
{
	struct tegra_gpio *gpio = gpiochip_get_data(domain->host_data);
	unsigned int port, pin, i, offset = 0;

	if (WARN_ON(gpio->gpio.of_gpio_n_cells < 2))
		return -EINVAL;

	if (WARN_ON(fwspec->param_count < gpio->gpio.of_gpio_n_cells))
		return -EINVAL;

	port = fwspec->param[0] / 8;
	pin = fwspec->param[0] % 8;

	if (port >= gpio->soc->num_ports)
		return -EINVAL;

	for (i = 0; i < port; i++)
		offset += gpio->soc->ports[i].pins;

	*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
	*hwirq = offset + pin;

	return 0;
}

static void *tegra186_gpio_populate_parent_fwspec(struct gpio_chip *chip,
						 unsigned int parent_hwirq,
						 unsigned int parent_type)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	struct irq_fwspec *fwspec;

	fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
	if (!fwspec)
		return NULL;

	fwspec->fwnode = chip->irq.parent_domain->fwnode;
	fwspec->param_count = 3;
	fwspec->param[0] = gpio->soc->instance;
	fwspec->param[1] = parent_hwirq;
	fwspec->param[2] = parent_type;

	return fwspec;
}

static int tegra186_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
					       unsigned int hwirq,
					       unsigned int type,
					       unsigned int *parent_hwirq,
					       unsigned int *parent_type)
{
	*parent_hwirq = chip->irq.child_offset_to_irq(chip, hwirq);
	*parent_type = type;

	return 0;
}

static unsigned int tegra186_gpio_child_offset_to_irq(struct gpio_chip *chip,
						      unsigned int offset)
{
	struct tegra_gpio *gpio = gpiochip_get_data(chip);
	unsigned int i;

	for (i = 0; i < gpio->soc->num_ports; i++) {
		if (offset < gpio->soc->ports[i].pins)
			break;

		offset -= gpio->soc->ports[i].pins;
	}

	return offset + i * 8;
}

static const struct of_device_id tegra186_pmc_of_match[] = {
	{ .compatible = "nvidia,tegra186-pmc" },
	{ .compatible = "nvidia,tegra194-pmc" },
	{ /* sentinel */ }
};

static void tegra186_gpio_init_route_mapping(struct tegra_gpio *gpio)
{
	unsigned int i, j;
	u32 value;

	for (i = 0; i < gpio->soc->num_ports; i++) {
		const struct tegra_gpio_port *port = &gpio->soc->ports[i];
		unsigned int offset, p = port->port;
		void __iomem *base;

		base = gpio->secure + port->bank * 0x1000 + 0x800;

		value = readl(base + TEGRA186_GPIO_CTL_SCR);

		/*
		 * For controllers that haven't been locked down yet, make
		 * sure to program the default interrupt route mapping.
		 */
		if ((value & TEGRA186_GPIO_CTL_SCR_SEC_REN) == 0 &&
		    (value & TEGRA186_GPIO_CTL_SCR_SEC_WEN) == 0) {
			for (j = 0; j < 8; j++) {
				offset = TEGRA186_GPIO_INT_ROUTE_MAPPING(p, j);

				value = readl(base + offset);
				value = BIT(port->pins) - 1;
				writel(value, base + offset);
			}
		}
	}
}

static int tegra186_gpio_probe(struct platform_device *pdev)
{
	unsigned int i, j, offset;
	struct gpio_irq_chip *irq;
	struct tegra_gpio *gpio;
	struct device_node *np;
	char **names;
	int err;

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

	gpio->soc = device_get_match_data(&pdev->dev);

	gpio->secure = devm_platform_ioremap_resource_byname(pdev, "security");
	if (IS_ERR(gpio->secure)) {
		gpio->secure = devm_platform_ioremap_resource(pdev, 0);
		if (IS_ERR(gpio->secure))
			return PTR_ERR(gpio->secure);
	}

	gpio->base = devm_platform_ioremap_resource_byname(pdev, "gpio");
	if (IS_ERR(gpio->base)) {
		gpio->base = devm_platform_ioremap_resource(pdev, 1);
		if (IS_ERR(gpio->base))
			return PTR_ERR(gpio->base);
	}

	err = platform_irq_count(pdev);
	if (err < 0)
		return err;

	gpio->num_irq = err;

	gpio->irq = devm_kcalloc(&pdev->dev, gpio->num_irq, sizeof(*gpio->irq),
				 GFP_KERNEL);
	if (!gpio->irq)
		return -ENOMEM;

	for (i = 0; i < gpio->num_irq; i++) {
		err = platform_get_irq(pdev, i);
		if (err < 0)
			return err;

		gpio->irq[i] = err;
	}

	gpio->gpio.label = gpio->soc->name;
	gpio->gpio.parent = &pdev->dev;

	gpio->gpio.request = gpiochip_generic_request;
	gpio->gpio.free = gpiochip_generic_free;
	gpio->gpio.get_direction = tegra186_gpio_get_direction;
	gpio->gpio.direction_input = tegra186_gpio_direction_input;
	gpio->gpio.direction_output = tegra186_gpio_direction_output;
	gpio->gpio.get = tegra186_gpio_get;
	gpio->gpio.set = tegra186_gpio_set;
	gpio->gpio.set_config = tegra186_gpio_set_config;
	gpio->gpio.add_pin_ranges = tegra186_gpio_add_pin_ranges;

	gpio->gpio.base = -1;

	for (i = 0; i < gpio->soc->num_ports; i++)
		gpio->gpio.ngpio += gpio->soc->ports[i].pins;

	names = devm_kcalloc(gpio->gpio.parent, gpio->gpio.ngpio,
			     sizeof(*names), GFP_KERNEL);
	if (!names)
		return -ENOMEM;

	for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
		const struct tegra_gpio_port *port = &gpio->soc->ports[i];
		char *name;

		for (j = 0; j < port->pins; j++) {
			name = devm_kasprintf(gpio->gpio.parent, GFP_KERNEL,
					      "P%s.%02x", port->name, j);
			if (!name)
				return -ENOMEM;

			names[offset + j] = name;
		}

		offset += port->pins;
	}

	gpio->gpio.names = (const char * const *)names;

#if defined(CONFIG_OF_GPIO)
	gpio->gpio.of_node = pdev->dev.of_node;
	gpio->gpio.of_gpio_n_cells = 2;
	gpio->gpio.of_xlate = tegra186_gpio_of_xlate;
#endif /* CONFIG_OF_GPIO */

	gpio->intc.name = dev_name(&pdev->dev);
	gpio->intc.irq_ack = tegra186_irq_ack;
	gpio->intc.irq_mask = tegra186_irq_mask;
	gpio->intc.irq_unmask = tegra186_irq_unmask;
	gpio->intc.irq_set_type = tegra186_irq_set_type;
	gpio->intc.irq_set_wake = tegra186_irq_set_wake;

	irq = &gpio->gpio.irq;
	irq->chip = &gpio->intc;
	irq->fwnode = of_node_to_fwnode(pdev->dev.of_node);
	irq->child_to_parent_hwirq = tegra186_gpio_child_to_parent_hwirq;
	irq->populate_parent_alloc_arg = tegra186_gpio_populate_parent_fwspec;
	irq->child_offset_to_irq = tegra186_gpio_child_offset_to_irq;
	irq->child_irq_domain_ops.translate = tegra186_gpio_irq_domain_translate;
	irq->handler = handle_simple_irq;
	irq->default_type = IRQ_TYPE_NONE;
	irq->parent_handler = tegra186_gpio_irq;
	irq->parent_handler_data = gpio;
	irq->num_parents = gpio->num_irq;
	irq->parents = gpio->irq;

	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
	if (np) {
		irq->parent_domain = irq_find_host(np);
		of_node_put(np);

		if (!irq->parent_domain)
			return -EPROBE_DEFER;
	}

	tegra186_gpio_init_route_mapping(gpio);

	irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
				sizeof(*irq->map), GFP_KERNEL);
	if (!irq->map)
		return -ENOMEM;

	for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
		const struct tegra_gpio_port *port = &gpio->soc->ports[i];

		for (j = 0; j < port->pins; j++)
			irq->map[offset + j] = irq->parents[port->bank];

		offset += port->pins;
	}

	return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio, gpio);
}

#define TEGRA186_MAIN_GPIO_PORT(_name, _bank, _port, _pins)	\
	[TEGRA186_MAIN_GPIO_PORT_##_name] = {			\
		.name = #_name,					\
		.bank = _bank,					\
		.port = _port,					\
		.pins = _pins,					\
	}

static const struct tegra_gpio_port tegra186_main_ports[] = {
	TEGRA186_MAIN_GPIO_PORT( A, 2, 0, 7),
	TEGRA186_MAIN_GPIO_PORT( B, 3, 0, 7),
	TEGRA186_MAIN_GPIO_PORT( C, 3, 1, 7),
	TEGRA186_MAIN_GPIO_PORT( D, 3, 2, 6),
	TEGRA186_MAIN_GPIO_PORT( E, 2, 1, 8),
	TEGRA186_MAIN_GPIO_PORT( F, 2, 2, 6),
	TEGRA186_MAIN_GPIO_PORT( G, 4, 1, 6),
	TEGRA186_MAIN_GPIO_PORT( H, 1, 0, 7),
	TEGRA186_MAIN_GPIO_PORT( I, 0, 4, 8),
	TEGRA186_MAIN_GPIO_PORT( J, 5, 0, 8),
	TEGRA186_MAIN_GPIO_PORT( K, 5, 1, 1),
	TEGRA186_MAIN_GPIO_PORT( L, 1, 1, 8),
	TEGRA186_MAIN_GPIO_PORT( M, 5, 3, 6),
	TEGRA186_MAIN_GPIO_PORT( N, 0, 0, 7),
	TEGRA186_MAIN_GPIO_PORT( O, 0, 1, 4),
	TEGRA186_MAIN_GPIO_PORT( P, 4, 0, 7),
	TEGRA186_MAIN_GPIO_PORT( Q, 0, 2, 6),
	TEGRA186_MAIN_GPIO_PORT( R, 0, 5, 6),
	TEGRA186_MAIN_GPIO_PORT( T, 0, 3, 4),
	TEGRA186_MAIN_GPIO_PORT( X, 1, 2, 8),
	TEGRA186_MAIN_GPIO_PORT( Y, 1, 3, 7),
	TEGRA186_MAIN_GPIO_PORT(BB, 2, 3, 2),
	TEGRA186_MAIN_GPIO_PORT(CC, 5, 2, 4),
};

static const struct tegra_gpio_soc tegra186_main_soc = {
	.num_ports = ARRAY_SIZE(tegra186_main_ports),
	.ports = tegra186_main_ports,
	.name = "tegra186-gpio",
	.instance = 0,
};

#define TEGRA186_AON_GPIO_PORT(_name, _bank, _port, _pins)	\
	[TEGRA186_AON_GPIO_PORT_##_name] = {			\
		.name = #_name,					\
		.bank = _bank,					\
		.port = _port,					\
		.pins = _pins,					\
	}

static const struct tegra_gpio_port tegra186_aon_ports[] = {
	TEGRA186_AON_GPIO_PORT( S, 0, 1, 5),
	TEGRA186_AON_GPIO_PORT( U, 0, 2, 6),
	TEGRA186_AON_GPIO_PORT( V, 0, 4, 8),
	TEGRA186_AON_GPIO_PORT( W, 0, 5, 8),
	TEGRA186_AON_GPIO_PORT( Z, 0, 7, 4),
	TEGRA186_AON_GPIO_PORT(AA, 0, 6, 8),
	TEGRA186_AON_GPIO_PORT(EE, 0, 3, 3),
	TEGRA186_AON_GPIO_PORT(FF, 0, 0, 5),
};

static const struct tegra_gpio_soc tegra186_aon_soc = {
	.num_ports = ARRAY_SIZE(tegra186_aon_ports),
	.ports = tegra186_aon_ports,
	.name = "tegra186-gpio-aon",
	.instance = 1,
};

#define TEGRA194_MAIN_GPIO_PORT(_name, _bank, _port, _pins)	\
	[TEGRA194_MAIN_GPIO_PORT_##_name] = {			\
		.name = #_name,					\
		.bank = _bank,					\
		.port = _port,					\
		.pins = _pins,					\
	}

static const struct tegra_gpio_port tegra194_main_ports[] = {
	TEGRA194_MAIN_GPIO_PORT( A, 1, 2, 8),
	TEGRA194_MAIN_GPIO_PORT( B, 4, 7, 2),
	TEGRA194_MAIN_GPIO_PORT( C, 4, 3, 8),
	TEGRA194_MAIN_GPIO_PORT( D, 4, 4, 4),
	TEGRA194_MAIN_GPIO_PORT( E, 4, 5, 8),
	TEGRA194_MAIN_GPIO_PORT( F, 4, 6, 6),
	TEGRA194_MAIN_GPIO_PORT( G, 4, 0, 8),
	TEGRA194_MAIN_GPIO_PORT( H, 4, 1, 8),
	TEGRA194_MAIN_GPIO_PORT( I, 4, 2, 5),
	TEGRA194_MAIN_GPIO_PORT( J, 5, 1, 6),
	TEGRA194_MAIN_GPIO_PORT( K, 3, 0, 8),
	TEGRA194_MAIN_GPIO_PORT( L, 3, 1, 4),
	TEGRA194_MAIN_GPIO_PORT( M, 2, 3, 8),
	TEGRA194_MAIN_GPIO_PORT( N, 2, 4, 3),
	TEGRA194_MAIN_GPIO_PORT( O, 5, 0, 6),
	TEGRA194_MAIN_GPIO_PORT( P, 2, 5, 8),
	TEGRA194_MAIN_GPIO_PORT( Q, 2, 6, 8),
	TEGRA194_MAIN_GPIO_PORT( R, 2, 7, 6),
	TEGRA194_MAIN_GPIO_PORT( S, 3, 3, 8),
	TEGRA194_MAIN_GPIO_PORT( T, 3, 4, 8),
	TEGRA194_MAIN_GPIO_PORT( U, 3, 5, 1),
	TEGRA194_MAIN_GPIO_PORT( V, 1, 0, 8),
	TEGRA194_MAIN_GPIO_PORT( W, 1, 1, 2),
	TEGRA194_MAIN_GPIO_PORT( X, 2, 0, 8),
	TEGRA194_MAIN_GPIO_PORT( Y, 2, 1, 8),
	TEGRA194_MAIN_GPIO_PORT( Z, 2, 2, 8),
	TEGRA194_MAIN_GPIO_PORT(FF, 3, 2, 2),
	TEGRA194_MAIN_GPIO_PORT(GG, 0, 0, 2)
};

static const struct tegra186_pin_range tegra194_main_pin_ranges[] = {
	{ TEGRA194_MAIN_GPIO(GG, 0), "pex_l5_clkreq_n_pgg0" },
	{ TEGRA194_MAIN_GPIO(GG, 1), "pex_l5_rst_n_pgg1" },
};

static const struct tegra_gpio_soc tegra194_main_soc = {
	.num_ports = ARRAY_SIZE(tegra194_main_ports),
	.ports = tegra194_main_ports,
	.name = "tegra194-gpio",
	.instance = 0,
	.num_pin_ranges = ARRAY_SIZE(tegra194_main_pin_ranges),
	.pin_ranges = tegra194_main_pin_ranges,
	.pinmux = "nvidia,tegra194-pinmux",
};

#define TEGRA194_AON_GPIO_PORT(_name, _bank, _port, _pins)	\
	[TEGRA194_AON_GPIO_PORT_##_name] = {			\
		.name = #_name,					\
		.bank = _bank,					\
		.port = _port,					\
		.pins = _pins,					\
	}

static const struct tegra_gpio_port tegra194_aon_ports[] = {
	TEGRA194_AON_GPIO_PORT(AA, 0, 3, 8),
	TEGRA194_AON_GPIO_PORT(BB, 0, 4, 4),
	TEGRA194_AON_GPIO_PORT(CC, 0, 1, 8),
	TEGRA194_AON_GPIO_PORT(DD, 0, 2, 3),
	TEGRA194_AON_GPIO_PORT(EE, 0, 0, 7)
};

static const struct tegra_gpio_soc tegra194_aon_soc = {
	.num_ports = ARRAY_SIZE(tegra194_aon_ports),
	.ports = tegra194_aon_ports,
	.name = "tegra194-gpio-aon",
	.instance = 1,
};

static const struct of_device_id tegra186_gpio_of_match[] = {
	{
		.compatible = "nvidia,tegra186-gpio",
		.data = &tegra186_main_soc
	}, {
		.compatible = "nvidia,tegra186-gpio-aon",
		.data = &tegra186_aon_soc
	}, {
		.compatible = "nvidia,tegra194-gpio",
		.data = &tegra194_main_soc
	}, {
		.compatible = "nvidia,tegra194-gpio-aon",
		.data = &tegra194_aon_soc
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, tegra186_gpio_of_match);

static const struct acpi_device_id  tegra186_gpio_acpi_match[] = {
	{ .id = "NVDA0108", .driver_data = (kernel_ulong_t)&tegra186_main_soc },
	{ .id = "NVDA0208", .driver_data = (kernel_ulong_t)&tegra186_aon_soc },
	{ .id = "NVDA0308", .driver_data = (kernel_ulong_t)&tegra194_main_soc },
	{ .id = "NVDA0408", .driver_data = (kernel_ulong_t)&tegra194_aon_soc },
	{}
};
MODULE_DEVICE_TABLE(acpi, tegra186_gpio_acpi_match);

static struct platform_driver tegra186_gpio_driver = {
	.driver = {
		.name = "tegra186-gpio",
		.of_match_table = tegra186_gpio_of_match,
		.acpi_match_table = tegra186_gpio_acpi_match,
	},
	.probe = tegra186_gpio_probe,
};
module_platform_driver(tegra186_gpio_driver);

MODULE_DESCRIPTION("NVIDIA Tegra186 GPIO controller driver");
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_LICENSE("GPL v2");