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14#include <linux/module.h>
15#include <linux/clk.h>
16#include <linux/err.h>
17#include <linux/gpio.h>
18#include <linux/gpio-pxa.h>
19#include <linux/init.h>
20#include <linux/interrupt.h>
21#include <linux/irq.h>
22#include <linux/irqdomain.h>
23#include <linux/irqchip/chained_irq.h>
24#include <linux/io.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/platform_device.h>
28#include <linux/syscore_ops.h>
29#include <linux/slab.h>
30
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51
52#define GPLR_OFFSET 0x00
53#define GPDR_OFFSET 0x0C
54#define GPSR_OFFSET 0x18
55#define GPCR_OFFSET 0x24
56#define GRER_OFFSET 0x30
57#define GFER_OFFSET 0x3C
58#define GEDR_OFFSET 0x48
59#define GAFR_OFFSET 0x54
60#define ED_MASK_OFFSET 0x9C
61
62#define BANK_OFF(n) (((n) / 3) << 8) + (((n) % 3) << 2)
63
64int pxa_last_gpio;
65static int irq_base;
66
67#ifdef CONFIG_OF
68static struct irq_domain *domain;
69static struct device_node *pxa_gpio_of_node;
70#endif
71
72struct pxa_gpio_chip {
73 struct gpio_chip chip;
74 void __iomem *regbase;
75 char label[10];
76
77 unsigned long irq_mask;
78 unsigned long irq_edge_rise;
79 unsigned long irq_edge_fall;
80 int (*set_wake)(unsigned int gpio, unsigned int on);
81
82#ifdef CONFIG_PM
83 unsigned long saved_gplr;
84 unsigned long saved_gpdr;
85 unsigned long saved_grer;
86 unsigned long saved_gfer;
87#endif
88};
89
90enum pxa_gpio_type {
91 PXA25X_GPIO = 0,
92 PXA26X_GPIO,
93 PXA27X_GPIO,
94 PXA3XX_GPIO,
95 PXA93X_GPIO,
96 MMP_GPIO = 0x10,
97 MMP2_GPIO,
98 PXA1928_GPIO,
99};
100
101struct pxa_gpio_id {
102 enum pxa_gpio_type type;
103 int gpio_nums;
104};
105
106static DEFINE_SPINLOCK(gpio_lock);
107static struct pxa_gpio_chip *pxa_gpio_chips;
108static enum pxa_gpio_type gpio_type;
109static void __iomem *gpio_reg_base;
110
111static struct pxa_gpio_id pxa25x_id = {
112 .type = PXA25X_GPIO,
113 .gpio_nums = 85,
114};
115
116static struct pxa_gpio_id pxa26x_id = {
117 .type = PXA26X_GPIO,
118 .gpio_nums = 90,
119};
120
121static struct pxa_gpio_id pxa27x_id = {
122 .type = PXA27X_GPIO,
123 .gpio_nums = 121,
124};
125
126static struct pxa_gpio_id pxa3xx_id = {
127 .type = PXA3XX_GPIO,
128 .gpio_nums = 128,
129};
130
131static struct pxa_gpio_id pxa93x_id = {
132 .type = PXA93X_GPIO,
133 .gpio_nums = 192,
134};
135
136static struct pxa_gpio_id mmp_id = {
137 .type = MMP_GPIO,
138 .gpio_nums = 128,
139};
140
141static struct pxa_gpio_id mmp2_id = {
142 .type = MMP2_GPIO,
143 .gpio_nums = 192,
144};
145
146static struct pxa_gpio_id pxa1928_id = {
147 .type = PXA1928_GPIO,
148 .gpio_nums = 224,
149};
150
151#define for_each_gpio_chip(i, c) \
152 for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++)
153
154static inline void __iomem *gpio_chip_base(struct gpio_chip *c)
155{
156 return container_of(c, struct pxa_gpio_chip, chip)->regbase;
157}
158
159static inline struct pxa_gpio_chip *gpio_to_pxachip(unsigned gpio)
160{
161 return &pxa_gpio_chips[gpio_to_bank(gpio)];
162}
163
164static inline int gpio_is_pxa_type(int type)
165{
166 return (type & MMP_GPIO) == 0;
167}
168
169static inline int gpio_is_mmp_type(int type)
170{
171 return (type & MMP_GPIO) != 0;
172}
173
174
175
176
177static inline int __gpio_is_inverted(int gpio)
178{
179 if ((gpio_type == PXA26X_GPIO) && (gpio > 85))
180 return 1;
181 return 0;
182}
183
184
185
186
187
188
189
190static inline int __gpio_is_occupied(unsigned gpio)
191{
192 struct pxa_gpio_chip *pxachip;
193 void __iomem *base;
194 unsigned long gafr = 0, gpdr = 0;
195 int ret, af = 0, dir = 0;
196
197 pxachip = gpio_to_pxachip(gpio);
198 base = gpio_chip_base(&pxachip->chip);
199 gpdr = readl_relaxed(base + GPDR_OFFSET);
200
201 switch (gpio_type) {
202 case PXA25X_GPIO:
203 case PXA26X_GPIO:
204 case PXA27X_GPIO:
205 gafr = readl_relaxed(base + GAFR_OFFSET);
206 af = (gafr >> ((gpio & 0xf) * 2)) & 0x3;
207 dir = gpdr & GPIO_bit(gpio);
208
209 if (__gpio_is_inverted(gpio))
210 ret = (af != 1) || (dir == 0);
211 else
212 ret = (af != 0) || (dir != 0);
213 break;
214 default:
215 ret = gpdr & GPIO_bit(gpio);
216 break;
217 }
218 return ret;
219}
220
221static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
222{
223 return chip->base + offset + irq_base;
224}
225
226int pxa_irq_to_gpio(int irq)
227{
228 return irq - irq_base;
229}
230
231static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
232{
233 void __iomem *base = gpio_chip_base(chip);
234 uint32_t value, mask = 1 << offset;
235 unsigned long flags;
236
237 spin_lock_irqsave(&gpio_lock, flags);
238
239 value = readl_relaxed(base + GPDR_OFFSET);
240 if (__gpio_is_inverted(chip->base + offset))
241 value |= mask;
242 else
243 value &= ~mask;
244 writel_relaxed(value, base + GPDR_OFFSET);
245
246 spin_unlock_irqrestore(&gpio_lock, flags);
247 return 0;
248}
249
250static int pxa_gpio_direction_output(struct gpio_chip *chip,
251 unsigned offset, int value)
252{
253 void __iomem *base = gpio_chip_base(chip);
254 uint32_t tmp, mask = 1 << offset;
255 unsigned long flags;
256
257 writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
258
259 spin_lock_irqsave(&gpio_lock, flags);
260
261 tmp = readl_relaxed(base + GPDR_OFFSET);
262 if (__gpio_is_inverted(chip->base + offset))
263 tmp &= ~mask;
264 else
265 tmp |= mask;
266 writel_relaxed(tmp, base + GPDR_OFFSET);
267
268 spin_unlock_irqrestore(&gpio_lock, flags);
269 return 0;
270}
271
272static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
273{
274 u32 gplr = readl_relaxed(gpio_chip_base(chip) + GPLR_OFFSET);
275 return !!(gplr & (1 << offset));
276}
277
278static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
279{
280 writel_relaxed(1 << offset, gpio_chip_base(chip) +
281 (value ? GPSR_OFFSET : GPCR_OFFSET));
282}
283
284#ifdef CONFIG_OF_GPIO
285static int pxa_gpio_of_xlate(struct gpio_chip *gc,
286 const struct of_phandle_args *gpiospec,
287 u32 *flags)
288{
289 if (gpiospec->args[0] > pxa_last_gpio)
290 return -EINVAL;
291
292 if (gc != &pxa_gpio_chips[gpiospec->args[0] / 32].chip)
293 return -EINVAL;
294
295 if (flags)
296 *flags = gpiospec->args[1];
297
298 return gpiospec->args[0] % 32;
299}
300#endif
301
302static int pxa_init_gpio_chip(int gpio_end,
303 int (*set_wake)(unsigned int, unsigned int))
304{
305 int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1;
306 struct pxa_gpio_chip *chips;
307
308 chips = kzalloc(nbanks * sizeof(struct pxa_gpio_chip), GFP_KERNEL);
309 if (chips == NULL) {
310 pr_err("%s: failed to allocate GPIO chips\n", __func__);
311 return -ENOMEM;
312 }
313
314 for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
315 struct gpio_chip *c = &chips[i].chip;
316
317 sprintf(chips[i].label, "gpio-%d", i);
318 chips[i].regbase = gpio_reg_base + BANK_OFF(i);
319 chips[i].set_wake = set_wake;
320
321 c->base = gpio;
322 c->label = chips[i].label;
323
324 c->direction_input = pxa_gpio_direction_input;
325 c->direction_output = pxa_gpio_direction_output;
326 c->get = pxa_gpio_get;
327 c->set = pxa_gpio_set;
328 c->to_irq = pxa_gpio_to_irq;
329#ifdef CONFIG_OF_GPIO
330 c->of_node = pxa_gpio_of_node;
331 c->of_xlate = pxa_gpio_of_xlate;
332 c->of_gpio_n_cells = 2;
333#endif
334
335
336 c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32;
337 gpiochip_add(c);
338 }
339 pxa_gpio_chips = chips;
340 return 0;
341}
342
343
344
345
346static inline void update_edge_detect(struct pxa_gpio_chip *c)
347{
348 uint32_t grer, gfer;
349
350 grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
351 gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
352 grer |= c->irq_edge_rise & c->irq_mask;
353 gfer |= c->irq_edge_fall & c->irq_mask;
354 writel_relaxed(grer, c->regbase + GRER_OFFSET);
355 writel_relaxed(gfer, c->regbase + GFER_OFFSET);
356}
357
358static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
359{
360 struct pxa_gpio_chip *c;
361 int gpio = pxa_irq_to_gpio(d->irq);
362 unsigned long gpdr, mask = GPIO_bit(gpio);
363
364 c = gpio_to_pxachip(gpio);
365
366 if (type == IRQ_TYPE_PROBE) {
367
368
369
370 if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
371 return 0;
372
373 if (__gpio_is_occupied(gpio))
374 return 0;
375
376 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
377 }
378
379 gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
380
381 if (__gpio_is_inverted(gpio))
382 writel_relaxed(gpdr | mask, c->regbase + GPDR_OFFSET);
383 else
384 writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);
385
386 if (type & IRQ_TYPE_EDGE_RISING)
387 c->irq_edge_rise |= mask;
388 else
389 c->irq_edge_rise &= ~mask;
390
391 if (type & IRQ_TYPE_EDGE_FALLING)
392 c->irq_edge_fall |= mask;
393 else
394 c->irq_edge_fall &= ~mask;
395
396 update_edge_detect(c);
397
398 pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,
399 ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
400 ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
401 return 0;
402}
403
404static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
405{
406 struct pxa_gpio_chip *c;
407 int loop, gpio, gpio_base, n;
408 unsigned long gedr;
409 struct irq_chip *chip = irq_desc_get_chip(desc);
410
411 chained_irq_enter(chip, desc);
412
413 do {
414 loop = 0;
415 for_each_gpio_chip(gpio, c) {
416 gpio_base = c->chip.base;
417
418 gedr = readl_relaxed(c->regbase + GEDR_OFFSET);
419 gedr = gedr & c->irq_mask;
420 writel_relaxed(gedr, c->regbase + GEDR_OFFSET);
421
422 for_each_set_bit(n, &gedr, BITS_PER_LONG) {
423 loop = 1;
424
425 generic_handle_irq(gpio_to_irq(gpio_base + n));
426 }
427 }
428 } while (loop);
429
430 chained_irq_exit(chip, desc);
431}
432
433static void pxa_ack_muxed_gpio(struct irq_data *d)
434{
435 int gpio = pxa_irq_to_gpio(d->irq);
436 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
437
438 writel_relaxed(GPIO_bit(gpio), c->regbase + GEDR_OFFSET);
439}
440
441static void pxa_mask_muxed_gpio(struct irq_data *d)
442{
443 int gpio = pxa_irq_to_gpio(d->irq);
444 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
445 uint32_t grer, gfer;
446
447 c->irq_mask &= ~GPIO_bit(gpio);
448
449 grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio);
450 gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio);
451 writel_relaxed(grer, c->regbase + GRER_OFFSET);
452 writel_relaxed(gfer, c->regbase + GFER_OFFSET);
453}
454
455static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on)
456{
457 int gpio = pxa_irq_to_gpio(d->irq);
458 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
459
460 if (c->set_wake)
461 return c->set_wake(gpio, on);
462 else
463 return 0;
464}
465
466static void pxa_unmask_muxed_gpio(struct irq_data *d)
467{
468 int gpio = pxa_irq_to_gpio(d->irq);
469 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
470
471 c->irq_mask |= GPIO_bit(gpio);
472 update_edge_detect(c);
473}
474
475static struct irq_chip pxa_muxed_gpio_chip = {
476 .name = "GPIO",
477 .irq_ack = pxa_ack_muxed_gpio,
478 .irq_mask = pxa_mask_muxed_gpio,
479 .irq_unmask = pxa_unmask_muxed_gpio,
480 .irq_set_type = pxa_gpio_irq_type,
481 .irq_set_wake = pxa_gpio_set_wake,
482};
483
484static int pxa_gpio_nums(struct platform_device *pdev)
485{
486 const struct platform_device_id *id = platform_get_device_id(pdev);
487 struct pxa_gpio_id *pxa_id = (struct pxa_gpio_id *)id->driver_data;
488 int count = 0;
489
490 switch (pxa_id->type) {
491 case PXA25X_GPIO:
492 case PXA26X_GPIO:
493 case PXA27X_GPIO:
494 case PXA3XX_GPIO:
495 case PXA93X_GPIO:
496 case MMP_GPIO:
497 case MMP2_GPIO:
498 case PXA1928_GPIO:
499 gpio_type = pxa_id->type;
500 count = pxa_id->gpio_nums - 1;
501 break;
502 default:
503 count = -EINVAL;
504 break;
505 }
506 return count;
507}
508
509#ifdef CONFIG_OF
510static const struct of_device_id pxa_gpio_dt_ids[] = {
511 { .compatible = "intel,pxa25x-gpio", .data = &pxa25x_id, },
512 { .compatible = "intel,pxa26x-gpio", .data = &pxa26x_id, },
513 { .compatible = "intel,pxa27x-gpio", .data = &pxa27x_id, },
514 { .compatible = "intel,pxa3xx-gpio", .data = &pxa3xx_id, },
515 { .compatible = "marvell,pxa93x-gpio", .data = &pxa93x_id, },
516 { .compatible = "marvell,mmp-gpio", .data = &mmp_id, },
517 { .compatible = "marvell,mmp2-gpio", .data = &mmp2_id, },
518 { .compatible = "marvell,pxa1928-gpio", .data = &pxa1928_id, },
519 {}
520};
521
522static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,
523 irq_hw_number_t hw)
524{
525 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
526 handle_edge_irq);
527 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
528 return 0;
529}
530
531const struct irq_domain_ops pxa_irq_domain_ops = {
532 .map = pxa_irq_domain_map,
533 .xlate = irq_domain_xlate_twocell,
534};
535
536static int pxa_gpio_probe_dt(struct platform_device *pdev)
537{
538 int ret = 0, nr_gpios;
539 struct device_node *np = pdev->dev.of_node;
540 const struct of_device_id *of_id =
541 of_match_device(pxa_gpio_dt_ids, &pdev->dev);
542 const struct pxa_gpio_id *gpio_id;
543
544 if (!of_id || !of_id->data) {
545 dev_err(&pdev->dev, "Failed to find gpio controller\n");
546 return -EFAULT;
547 }
548 gpio_id = of_id->data;
549 gpio_type = gpio_id->type;
550
551 nr_gpios = gpio_id->gpio_nums;
552 pxa_last_gpio = nr_gpios - 1;
553
554 irq_base = irq_alloc_descs(-1, 0, nr_gpios, 0);
555 if (irq_base < 0) {
556 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
557 ret = irq_base;
558 goto err;
559 }
560 domain = irq_domain_add_legacy(np, nr_gpios, irq_base, 0,
561 &pxa_irq_domain_ops, NULL);
562 pxa_gpio_of_node = np;
563 return 0;
564err:
565 iounmap(gpio_reg_base);
566 return ret;
567}
568#else
569#define pxa_gpio_probe_dt(pdev) (-1)
570#endif
571
572static int pxa_gpio_probe(struct platform_device *pdev)
573{
574 struct pxa_gpio_chip *c;
575 struct resource *res;
576 struct clk *clk;
577 struct pxa_gpio_platform_data *info;
578 int gpio, irq, ret, use_of = 0;
579 int irq0 = 0, irq1 = 0, irq_mux, gpio_offset = 0;
580
581 info = dev_get_platdata(&pdev->dev);
582 if (info) {
583 irq_base = info->irq_base;
584 if (irq_base <= 0)
585 return -EINVAL;
586 pxa_last_gpio = pxa_gpio_nums(pdev);
587 } else {
588 irq_base = 0;
589 use_of = 1;
590 ret = pxa_gpio_probe_dt(pdev);
591 if (ret < 0)
592 return -EINVAL;
593 }
594
595 if (!pxa_last_gpio)
596 return -EINVAL;
597
598 irq0 = platform_get_irq_byname(pdev, "gpio0");
599 irq1 = platform_get_irq_byname(pdev, "gpio1");
600 irq_mux = platform_get_irq_byname(pdev, "gpio_mux");
601 if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0)
602 || (irq_mux <= 0))
603 return -EINVAL;
604 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
605 if (!res)
606 return -EINVAL;
607 gpio_reg_base = ioremap(res->start, resource_size(res));
608 if (!gpio_reg_base)
609 return -EINVAL;
610
611 if (irq0 > 0)
612 gpio_offset = 2;
613
614 clk = clk_get(&pdev->dev, NULL);
615 if (IS_ERR(clk)) {
616 dev_err(&pdev->dev, "Error %ld to get gpio clock\n",
617 PTR_ERR(clk));
618 iounmap(gpio_reg_base);
619 return PTR_ERR(clk);
620 }
621 ret = clk_prepare_enable(clk);
622 if (ret) {
623 clk_put(clk);
624 iounmap(gpio_reg_base);
625 return ret;
626 }
627
628
629 pxa_init_gpio_chip(pxa_last_gpio, info ? info->gpio_set_wake : NULL);
630
631
632 for_each_gpio_chip(gpio, c) {
633 writel_relaxed(0, c->regbase + GFER_OFFSET);
634 writel_relaxed(0, c->regbase + GRER_OFFSET);
635 writel_relaxed(~0, c->regbase + GEDR_OFFSET);
636
637 if (gpio_is_mmp_type(gpio_type))
638 writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);
639 }
640
641 if (!use_of) {
642 if (irq0 > 0) {
643 irq = gpio_to_irq(0);
644 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
645 handle_edge_irq);
646 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
647 }
648 if (irq1 > 0) {
649 irq = gpio_to_irq(1);
650 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
651 handle_edge_irq);
652 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
653 }
654
655 for (irq = gpio_to_irq(gpio_offset);
656 irq <= gpio_to_irq(pxa_last_gpio); irq++) {
657 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
658 handle_edge_irq);
659 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
660 }
661 }
662
663 if (irq0 > 0)
664 irq_set_chained_handler(irq0, pxa_gpio_demux_handler);
665 if (irq1 > 0)
666 irq_set_chained_handler(irq1, pxa_gpio_demux_handler);
667
668 irq_set_chained_handler(irq_mux, pxa_gpio_demux_handler);
669 return 0;
670}
671
672static const struct platform_device_id gpio_id_table[] = {
673 { "pxa25x-gpio", (unsigned long)&pxa25x_id },
674 { "pxa26x-gpio", (unsigned long)&pxa26x_id },
675 { "pxa27x-gpio", (unsigned long)&pxa27x_id },
676 { "pxa3xx-gpio", (unsigned long)&pxa3xx_id },
677 { "pxa93x-gpio", (unsigned long)&pxa93x_id },
678 { "mmp-gpio", (unsigned long)&mmp_id },
679 { "mmp2-gpio", (unsigned long)&mmp2_id },
680 { "pxa1928-gpio", (unsigned long)&pxa1928_id },
681 { },
682};
683
684static struct platform_driver pxa_gpio_driver = {
685 .probe = pxa_gpio_probe,
686 .driver = {
687 .name = "pxa-gpio",
688 .of_match_table = of_match_ptr(pxa_gpio_dt_ids),
689 },
690 .id_table = gpio_id_table,
691};
692
693static int __init pxa_gpio_init(void)
694{
695 return platform_driver_register(&pxa_gpio_driver);
696}
697postcore_initcall(pxa_gpio_init);
698
699#ifdef CONFIG_PM
700static int pxa_gpio_suspend(void)
701{
702 struct pxa_gpio_chip *c;
703 int gpio;
704
705 for_each_gpio_chip(gpio, c) {
706 c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);
707 c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
708 c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);
709 c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);
710
711
712 writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);
713 }
714 return 0;
715}
716
717static void pxa_gpio_resume(void)
718{
719 struct pxa_gpio_chip *c;
720 int gpio;
721
722 for_each_gpio_chip(gpio, c) {
723
724 writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET);
725 writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);
726
727 writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);
728 writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);
729 writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);
730 }
731}
732#else
733#define pxa_gpio_suspend NULL
734#define pxa_gpio_resume NULL
735#endif
736
737struct syscore_ops pxa_gpio_syscore_ops = {
738 .suspend = pxa_gpio_suspend,
739 .resume = pxa_gpio_resume,
740};
741
742static int __init pxa_gpio_sysinit(void)
743{
744 register_syscore_ops(&pxa_gpio_syscore_ops);
745 return 0;
746}
747postcore_initcall(pxa_gpio_sysinit);
748
