summaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl/samsung/pinctrl-exynos.c
blob: 0a625a64ff5de87baa110a4d7acc3c8e9a5c860d (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
// SPDX-License-Identifier: GPL-2.0+
//
// Exynos specific support for Samsung pinctrl/gpiolib driver with eint support.
//
// Copyright (c) 2012 Samsung Electronics Co., Ltd.
//		http://www.samsung.com
// Copyright (c) 2012 Linaro Ltd
//		http://www.linaro.org
//
// Author: Thomas Abraham <thomas.ab@samsung.com>
//
// This file contains the Samsung Exynos specific information required by the
// the Samsung pinctrl/gpiolib driver. It also includes the implementation of
// external gpio and wakeup interrupt support.

#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/soc/samsung/exynos-pmu.h>

#include <dt-bindings/pinctrl/samsung.h>

#include "pinctrl-samsung.h"
#include "pinctrl-exynos.h"

struct exynos_irq_chip {
	struct irq_chip chip;

	u32 eint_con;
	u32 eint_mask;
	u32 eint_pend;
};

static inline struct exynos_irq_chip *to_exynos_irq_chip(struct irq_chip *chip)
{
	return container_of(chip, struct exynos_irq_chip, chip);
}

static void exynos_irq_mask(struct irq_data *irqd)
{
	struct irq_chip *chip = irq_data_get_irq_chip(irqd);
	struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	unsigned long reg_mask = our_chip->eint_mask + bank->eint_offset;
	unsigned long mask;
	unsigned long flags;

	spin_lock_irqsave(&bank->slock, flags);

	mask = readl(bank->eint_base + reg_mask);
	mask |= 1 << irqd->hwirq;
	writel(mask, bank->eint_base + reg_mask);

	spin_unlock_irqrestore(&bank->slock, flags);
}

static void exynos_irq_ack(struct irq_data *irqd)
{
	struct irq_chip *chip = irq_data_get_irq_chip(irqd);
	struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	unsigned long reg_pend = our_chip->eint_pend + bank->eint_offset;

	writel(1 << irqd->hwirq, bank->eint_base + reg_pend);
}

static void exynos_irq_unmask(struct irq_data *irqd)
{
	struct irq_chip *chip = irq_data_get_irq_chip(irqd);
	struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	unsigned long reg_mask = our_chip->eint_mask + bank->eint_offset;
	unsigned long mask;
	unsigned long flags;

	/*
	 * Ack level interrupts right before unmask
	 *
	 * If we don't do this we'll get a double-interrupt.  Level triggered
	 * interrupts must not fire an interrupt if the level is not
	 * _currently_ active, even if it was active while the interrupt was
	 * masked.
	 */
	if (irqd_get_trigger_type(irqd) & IRQ_TYPE_LEVEL_MASK)
		exynos_irq_ack(irqd);

	spin_lock_irqsave(&bank->slock, flags);

	mask = readl(bank->eint_base + reg_mask);
	mask &= ~(1 << irqd->hwirq);
	writel(mask, bank->eint_base + reg_mask);

	spin_unlock_irqrestore(&bank->slock, flags);
}

static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type)
{
	struct irq_chip *chip = irq_data_get_irq_chip(irqd);
	struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq;
	unsigned int con, trig_type;
	unsigned long reg_con = our_chip->eint_con + bank->eint_offset;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		trig_type = EXYNOS_EINT_EDGE_RISING;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		trig_type = EXYNOS_EINT_EDGE_FALLING;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		trig_type = EXYNOS_EINT_EDGE_BOTH;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		trig_type = EXYNOS_EINT_LEVEL_HIGH;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		trig_type = EXYNOS_EINT_LEVEL_LOW;
		break;
	default:
		pr_err("unsupported external interrupt type\n");
		return -EINVAL;
	}

	if (type & IRQ_TYPE_EDGE_BOTH)
		irq_set_handler_locked(irqd, handle_edge_irq);
	else
		irq_set_handler_locked(irqd, handle_level_irq);

	con = readl(bank->eint_base + reg_con);
	con &= ~(EXYNOS_EINT_CON_MASK << shift);
	con |= trig_type << shift;
	writel(con, bank->eint_base + reg_con);

	return 0;
}

static int exynos_irq_request_resources(struct irq_data *irqd)
{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	const struct samsung_pin_bank_type *bank_type = bank->type;
	unsigned long reg_con, flags;
	unsigned int shift, mask, con;
	int ret;

	ret = gpiochip_lock_as_irq(&bank->gpio_chip, irqd->hwirq);
	if (ret) {
		dev_err(bank->gpio_chip.parent,
			"unable to lock pin %s-%lu IRQ\n",
			bank->name, irqd->hwirq);
		return ret;
	}

	reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
	shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;

	spin_lock_irqsave(&bank->slock, flags);

	con = readl(bank->pctl_base + reg_con);
	con &= ~(mask << shift);
	con |= EXYNOS_PIN_FUNC_EINT << shift;
	writel(con, bank->pctl_base + reg_con);

	spin_unlock_irqrestore(&bank->slock, flags);

	return 0;
}

static void exynos_irq_release_resources(struct irq_data *irqd)
{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	const struct samsung_pin_bank_type *bank_type = bank->type;
	unsigned long reg_con, flags;
	unsigned int shift, mask, con;

	reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
	shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;

	spin_lock_irqsave(&bank->slock, flags);

	con = readl(bank->pctl_base + reg_con);
	con &= ~(mask << shift);
	con |= EXYNOS_PIN_FUNC_INPUT << shift;
	writel(con, bank->pctl_base + reg_con);

	spin_unlock_irqrestore(&bank->slock, flags);

	gpiochip_unlock_as_irq(&bank->gpio_chip, irqd->hwirq);
}

/*
 * irq_chip for gpio interrupts.
 */
static struct exynos_irq_chip exynos_gpio_irq_chip = {
	.chip = {
		.name = "exynos_gpio_irq_chip",
		.irq_unmask = exynos_irq_unmask,
		.irq_mask = exynos_irq_mask,
		.irq_ack = exynos_irq_ack,
		.irq_set_type = exynos_irq_set_type,
		.irq_request_resources = exynos_irq_request_resources,
		.irq_release_resources = exynos_irq_release_resources,
	},
	.eint_con = EXYNOS_GPIO_ECON_OFFSET,
	.eint_mask = EXYNOS_GPIO_EMASK_OFFSET,
	.eint_pend = EXYNOS_GPIO_EPEND_OFFSET,
};

static int exynos_eint_irq_map(struct irq_domain *h, unsigned int virq,
					irq_hw_number_t hw)
{
	struct samsung_pin_bank *b = h->host_data;

	irq_set_chip_data(virq, b);
	irq_set_chip_and_handler(virq, &b->irq_chip->chip,
					handle_level_irq);
	return 0;
}

/*
 * irq domain callbacks for external gpio and wakeup interrupt controllers.
 */
static const struct irq_domain_ops exynos_eint_irqd_ops = {
	.map	= exynos_eint_irq_map,
	.xlate	= irq_domain_xlate_twocell,
};

static irqreturn_t exynos_eint_gpio_irq(int irq, void *data)
{
	struct samsung_pinctrl_drv_data *d = data;
	struct samsung_pin_bank *bank = d->pin_banks;
	unsigned int svc, group, pin, virq;

	svc = readl(bank->eint_base + EXYNOS_SVC_OFFSET);
	group = EXYNOS_SVC_GROUP(svc);
	pin = svc & EXYNOS_SVC_NUM_MASK;

	if (!group)
		return IRQ_HANDLED;
	bank += (group - 1);

	virq = irq_linear_revmap(bank->irq_domain, pin);
	if (!virq)
		return IRQ_NONE;
	generic_handle_irq(virq);
	return IRQ_HANDLED;
}

struct exynos_eint_gpio_save {
	u32 eint_con;
	u32 eint_fltcon0;
	u32 eint_fltcon1;
};

/*
 * exynos_eint_gpio_init() - setup handling of external gpio interrupts.
 * @d: driver data of samsung pinctrl driver.
 */
int exynos_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
{
	struct samsung_pin_bank *bank;
	struct device *dev = d->dev;
	int ret;
	int i;

	if (!d->irq) {
		dev_err(dev, "irq number not available\n");
		return -EINVAL;
	}

	ret = devm_request_irq(dev, d->irq, exynos_eint_gpio_irq,
					0, dev_name(dev), d);
	if (ret) {
		dev_err(dev, "irq request failed\n");
		return -ENXIO;
	}

	bank = d->pin_banks;
	for (i = 0; i < d->nr_banks; ++i, ++bank) {
		if (bank->eint_type != EINT_TYPE_GPIO)
			continue;
		bank->irq_domain = irq_domain_add_linear(bank->of_node,
				bank->nr_pins, &exynos_eint_irqd_ops, bank);
		if (!bank->irq_domain) {
			dev_err(dev, "gpio irq domain add failed\n");
			ret = -ENXIO;
			goto err_domains;
		}

		bank->soc_priv = devm_kzalloc(d->dev,
			sizeof(struct exynos_eint_gpio_save), GFP_KERNEL);
		if (!bank->soc_priv) {
			irq_domain_remove(bank->irq_domain);
			ret = -ENOMEM;
			goto err_domains;
		}

		bank->irq_chip = &exynos_gpio_irq_chip;
	}

	return 0;

err_domains:
	for (--i, --bank; i >= 0; --i, --bank) {
		if (bank->eint_type != EINT_TYPE_GPIO)
			continue;
		irq_domain_remove(bank->irq_domain);
	}

	return ret;
}

static u32 exynos_eint_wake_mask = 0xffffffff;

u32 exynos_get_eint_wake_mask(void)
{
	return exynos_eint_wake_mask;
}

static int exynos_wkup_irq_set_wake(struct irq_data *irqd, unsigned int on)
{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	unsigned long bit = 1UL << (2 * bank->eint_offset + irqd->hwirq);

	pr_info("wake %s for irq %d\n", on ? "enabled" : "disabled", irqd->irq);

	if (!on)
		exynos_eint_wake_mask |= bit;
	else
		exynos_eint_wake_mask &= ~bit;

	return 0;
}

/*
 * irq_chip for wakeup interrupts
 */
static const struct exynos_irq_chip exynos4210_wkup_irq_chip __initconst = {
	.chip = {
		.name = "exynos4210_wkup_irq_chip",
		.irq_unmask = exynos_irq_unmask,
		.irq_mask = exynos_irq_mask,
		.irq_ack = exynos_irq_ack,
		.irq_set_type = exynos_irq_set_type,
		.irq_set_wake = exynos_wkup_irq_set_wake,
		.irq_request_resources = exynos_irq_request_resources,
		.irq_release_resources = exynos_irq_release_resources,
	},
	.eint_con = EXYNOS_WKUP_ECON_OFFSET,
	.eint_mask = EXYNOS_WKUP_EMASK_OFFSET,
	.eint_pend = EXYNOS_WKUP_EPEND_OFFSET,
};

static const struct exynos_irq_chip exynos7_wkup_irq_chip __initconst = {
	.chip = {
		.name = "exynos7_wkup_irq_chip",
		.irq_unmask = exynos_irq_unmask,
		.irq_mask = exynos_irq_mask,
		.irq_ack = exynos_irq_ack,
		.irq_set_type = exynos_irq_set_type,
		.irq_set_wake = exynos_wkup_irq_set_wake,
		.irq_request_resources = exynos_irq_request_resources,
		.irq_release_resources = exynos_irq_release_resources,
	},
	.eint_con = EXYNOS7_WKUP_ECON_OFFSET,
	.eint_mask = EXYNOS7_WKUP_EMASK_OFFSET,
	.eint_pend = EXYNOS7_WKUP_EPEND_OFFSET,
};

/* list of external wakeup controllers supported */
static const struct of_device_id exynos_wkup_irq_ids[] = {
	{ .compatible = "samsung,exynos4210-wakeup-eint",
			.data = &exynos4210_wkup_irq_chip },
	{ .compatible = "samsung,exynos7-wakeup-eint",
			.data = &exynos7_wkup_irq_chip },
	{ }
};

/* interrupt handler for wakeup interrupts 0..15 */
static void exynos_irq_eint0_15(struct irq_desc *desc)
{
	struct exynos_weint_data *eintd = irq_desc_get_handler_data(desc);
	struct samsung_pin_bank *bank = eintd->bank;
	struct irq_chip *chip = irq_desc_get_chip(desc);
	int eint_irq;

	chained_irq_enter(chip, desc);

	eint_irq = irq_linear_revmap(bank->irq_domain, eintd->irq);
	generic_handle_irq(eint_irq);

	chained_irq_exit(chip, desc);
}

static inline void exynos_irq_demux_eint(unsigned long pend,
						struct irq_domain *domain)
{
	unsigned int irq;

	while (pend) {
		irq = fls(pend) - 1;
		generic_handle_irq(irq_find_mapping(domain, irq));
		pend &= ~(1 << irq);
	}
}

/* interrupt handler for wakeup interrupt 16 */
static void exynos_irq_demux_eint16_31(struct irq_desc *desc)
{
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct exynos_muxed_weint_data *eintd = irq_desc_get_handler_data(desc);
	unsigned long pend;
	unsigned long mask;
	int i;

	chained_irq_enter(chip, desc);

	for (i = 0; i < eintd->nr_banks; ++i) {
		struct samsung_pin_bank *b = eintd->banks[i];
		pend = readl(b->eint_base + b->irq_chip->eint_pend
				+ b->eint_offset);
		mask = readl(b->eint_base + b->irq_chip->eint_mask
				+ b->eint_offset);
		exynos_irq_demux_eint(pend & ~mask, b->irq_domain);
	}

	chained_irq_exit(chip, desc);
}

/*
 * exynos_eint_wkup_init() - setup handling of external wakeup interrupts.
 * @d: driver data of samsung pinctrl driver.
 */
int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
{
	struct device *dev = d->dev;
	struct device_node *wkup_np = NULL;
	struct device_node *np;
	struct samsung_pin_bank *bank;
	struct exynos_weint_data *weint_data;
	struct exynos_muxed_weint_data *muxed_data;
	struct exynos_irq_chip *irq_chip;
	unsigned int muxed_banks = 0;
	unsigned int i;
	int idx, irq;

	for_each_child_of_node(dev->of_node, np) {
		const struct of_device_id *match;

		match = of_match_node(exynos_wkup_irq_ids, np);
		if (match) {
			irq_chip = kmemdup(match->data,
				sizeof(*irq_chip), GFP_KERNEL);
			if (!irq_chip)
				return -ENOMEM;
			wkup_np = np;
			break;
		}
	}
	if (!wkup_np)
		return -ENODEV;

	bank = d->pin_banks;
	for (i = 0; i < d->nr_banks; ++i, ++bank) {
		if (bank->eint_type != EINT_TYPE_WKUP)
			continue;

		bank->irq_domain = irq_domain_add_linear(bank->of_node,
				bank->nr_pins, &exynos_eint_irqd_ops, bank);
		if (!bank->irq_domain) {
			dev_err(dev, "wkup irq domain add failed\n");
			return -ENXIO;
		}

		bank->irq_chip = irq_chip;

		if (!of_find_property(bank->of_node, "interrupts", NULL)) {
			bank->eint_type = EINT_TYPE_WKUP_MUX;
			++muxed_banks;
			continue;
		}

		weint_data = devm_kzalloc(dev, bank->nr_pins
					* sizeof(*weint_data), GFP_KERNEL);
		if (!weint_data)
			return -ENOMEM;

		for (idx = 0; idx < bank->nr_pins; ++idx) {
			irq = irq_of_parse_and_map(bank->of_node, idx);
			if (!irq) {
				dev_err(dev, "irq number for eint-%s-%d not found\n",
							bank->name, idx);
				continue;
			}
			weint_data[idx].irq = idx;
			weint_data[idx].bank = bank;
			irq_set_chained_handler_and_data(irq,
							 exynos_irq_eint0_15,
							 &weint_data[idx]);
		}
	}

	if (!muxed_banks)
		return 0;

	irq = irq_of_parse_and_map(wkup_np, 0);
	if (!irq) {
		dev_err(dev, "irq number for muxed EINTs not found\n");
		return 0;
	}

	muxed_data = devm_kzalloc(dev, sizeof(*muxed_data)
		+ muxed_banks*sizeof(struct samsung_pin_bank *), GFP_KERNEL);
	if (!muxed_data)
		return -ENOMEM;

	irq_set_chained_handler_and_data(irq, exynos_irq_demux_eint16_31,
					 muxed_data);

	bank = d->pin_banks;
	idx = 0;
	for (i = 0; i < d->nr_banks; ++i, ++bank) {
		if (bank->eint_type != EINT_TYPE_WKUP_MUX)
			continue;

		muxed_data->banks[idx++] = bank;
	}
	muxed_data->nr_banks = muxed_banks;

	return 0;
}

static void exynos_pinctrl_suspend_bank(
				struct samsung_pinctrl_drv_data *drvdata,
				struct samsung_pin_bank *bank)
{
	struct exynos_eint_gpio_save *save = bank->soc_priv;
	void __iomem *regs = bank->eint_base;

	save->eint_con = readl(regs + EXYNOS_GPIO_ECON_OFFSET
						+ bank->eint_offset);
	save->eint_fltcon0 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
						+ 2 * bank->eint_offset);
	save->eint_fltcon1 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
						+ 2 * bank->eint_offset + 4);

	pr_debug("%s: save     con %#010x\n", bank->name, save->eint_con);
	pr_debug("%s: save fltcon0 %#010x\n", bank->name, save->eint_fltcon0);
	pr_debug("%s: save fltcon1 %#010x\n", bank->name, save->eint_fltcon1);
}

void exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data *drvdata)
{
	struct samsung_pin_bank *bank = drvdata->pin_banks;
	int i;

	for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
		if (bank->eint_type == EINT_TYPE_GPIO)
			exynos_pinctrl_suspend_bank(drvdata, bank);
}

static void exynos_pinctrl_resume_bank(
				struct samsung_pinctrl_drv_data *drvdata,
				struct samsung_pin_bank *bank)
{
	struct exynos_eint_gpio_save *save = bank->soc_priv;
	void __iomem *regs = bank->eint_base;

	pr_debug("%s:     con %#010x => %#010x\n", bank->name,
			readl(regs + EXYNOS_GPIO_ECON_OFFSET
			+ bank->eint_offset), save->eint_con);
	pr_debug("%s: fltcon0 %#010x => %#010x\n", bank->name,
			readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
			+ 2 * bank->eint_offset), save->eint_fltcon0);
	pr_debug("%s: fltcon1 %#010x => %#010x\n", bank->name,
			readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
			+ 2 * bank->eint_offset + 4), save->eint_fltcon1);

	writel(save->eint_con, regs + EXYNOS_GPIO_ECON_OFFSET
						+ bank->eint_offset);
	writel(save->eint_fltcon0, regs + EXYNOS_GPIO_EFLTCON_OFFSET
						+ 2 * bank->eint_offset);
	writel(save->eint_fltcon1, regs + EXYNOS_GPIO_EFLTCON_OFFSET
						+ 2 * bank->eint_offset + 4);
}

void exynos_pinctrl_resume(struct samsung_pinctrl_drv_data *drvdata)
{
	struct samsung_pin_bank *bank = drvdata->pin_banks;
	int i;

	for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
		if (bank->eint_type == EINT_TYPE_GPIO)
			exynos_pinctrl_resume_bank(drvdata, bank);
}

static void exynos_retention_enable(struct samsung_pinctrl_drv_data *drvdata)
{
	if (drvdata->retention_ctrl->refcnt)
		atomic_inc(drvdata->retention_ctrl->refcnt);
}

static void exynos_retention_disable(struct samsung_pinctrl_drv_data *drvdata)
{
	struct samsung_retention_ctrl *ctrl = drvdata->retention_ctrl;
	struct regmap *pmu_regs = ctrl->priv;
	int i;

	if (ctrl->refcnt && !atomic_dec_and_test(ctrl->refcnt))
		return;

	for (i = 0; i < ctrl->nr_regs; i++)
		regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
}

struct samsung_retention_ctrl *
exynos_retention_init(struct samsung_pinctrl_drv_data *drvdata,
		      const struct samsung_retention_data *data)
{
	struct samsung_retention_ctrl *ctrl;
	struct regmap *pmu_regs;
	int i;

	ctrl = devm_kzalloc(drvdata->dev, sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl)
		return ERR_PTR(-ENOMEM);

	pmu_regs = exynos_get_pmu_regmap();
	if (IS_ERR(pmu_regs))
		return ERR_CAST(pmu_regs);

	ctrl->priv = pmu_regs;
	ctrl->regs = data->regs;
	ctrl->nr_regs = data->nr_regs;
	ctrl->value = data->value;
	ctrl->refcnt = data->refcnt;
	ctrl->enable = exynos_retention_enable;
	ctrl->disable = exynos_retention_disable;

	/* Ensure that retention is disabled on driver init */
	for (i = 0; i < ctrl->nr_regs; i++)
		regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);

	return ctrl;
}
OpenPOWER on IntegriCloud