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tuntap: switch to use rtnl_dereference()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / gpio / gpio-pxa.c
blob8325f580c0f1b93149f4856db784093aaf20d177
1 /*
2 * linux/arch/arm/plat-pxa/gpio.c
3 *
4 * Generic PXA GPIO handling
5 *
6 * Author: Nicolas Pitre
7 * Created: Jun 15, 2001
8 * Copyright: MontaVista Software Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
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/irq.h>
21 #include <linux/irqdomain.h>
22 #include <linux/io.h>
23 #include <linux/of.h>
24 #include <linux/of_device.h>
25 #include <linux/platform_device.h>
26 #include <linux/syscore_ops.h>
27 #include <linux/slab.h>
28
29 #include <asm/mach/irq.h>
30
31 #include <mach/irqs.h>
32
33 /*
34 * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with
35 * one set of registers. The register offsets are organized below:
36 *
37 * GPLR GPDR GPSR GPCR GRER GFER GEDR
38 * BANK 0 - 0x0000 0x000C 0x0018 0x0024 0x0030 0x003C 0x0048
39 * BANK 1 - 0x0004 0x0010 0x001C 0x0028 0x0034 0x0040 0x004C
40 * BANK 2 - 0x0008 0x0014 0x0020 0x002C 0x0038 0x0044 0x0050
41 *
42 * BANK 3 - 0x0100 0x010C 0x0118 0x0124 0x0130 0x013C 0x0148
43 * BANK 4 - 0x0104 0x0110 0x011C 0x0128 0x0134 0x0140 0x014C
44 * BANK 5 - 0x0108 0x0114 0x0120 0x012C 0x0138 0x0144 0x0150
45 *
46 * NOTE:
47 * BANK 3 is only available on PXA27x and later processors.
48 * BANK 4 and 5 are only available on PXA935
49 */
50
51 #define GPLR_OFFSET 0x00
52 #define GPDR_OFFSET 0x0C
53 #define GPSR_OFFSET 0x18
54 #define GPCR_OFFSET 0x24
55 #define GRER_OFFSET 0x30
56 #define GFER_OFFSET 0x3C
57 #define GEDR_OFFSET 0x48
58 #define GAFR_OFFSET 0x54
59 #define ED_MASK_OFFSET 0x9C /* GPIO edge detection for AP side */
60
61 #define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
62
63 int pxa_last_gpio;
64 static int irq_base;
65
66 #ifdef CONFIG_OF
67 static struct irq_domain *domain;
68 static struct device_node *pxa_gpio_of_node;
69 #endif
70
71 struct pxa_gpio_chip {
72 struct gpio_chip chip;
73 void __iomem *regbase;
74 char label[10];
75
76 unsigned long irq_mask;
77 unsigned long irq_edge_rise;
78 unsigned long irq_edge_fall;
79 int (*set_wake)(unsigned int gpio, unsigned int on);
80
81 #ifdef CONFIG_PM
82 unsigned long saved_gplr;
83 unsigned long saved_gpdr;
84 unsigned long saved_grer;
85 unsigned long saved_gfer;
86 #endif
87 };
88
89 enum {
90 PXA25X_GPIO = 0,
91 PXA26X_GPIO,
92 PXA27X_GPIO,
93 PXA3XX_GPIO,
94 PXA93X_GPIO,
95 MMP_GPIO = 0x10,
96 };
97
98 static DEFINE_SPINLOCK(gpio_lock);
99 static struct pxa_gpio_chip *pxa_gpio_chips;
100 static int gpio_type;
101 static void __iomem *gpio_reg_base;
102
103 #define for_each_gpio_chip(i, c) \
104 for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++)
105
106 static inline void __iomem *gpio_chip_base(struct gpio_chip *c)
107 {
108 return container_of(c, struct pxa_gpio_chip, chip)->regbase;
109 }
110
111 static inline struct pxa_gpio_chip *gpio_to_pxachip(unsigned gpio)
112 {
113 return &pxa_gpio_chips[gpio_to_bank(gpio)];
114 }
115
116 static inline int gpio_is_pxa_type(int type)
117 {
118 return (type & MMP_GPIO) == 0;
119 }
120
121 static inline int gpio_is_mmp_type(int type)
122 {
123 return (type & MMP_GPIO) != 0;
124 }
125
126 /* GPIO86/87/88/89 on PXA26x have their direction bits in PXA_GPDR(2 inverted,
127 * as well as their Alternate Function value being '1' for GPIO in GAFRx.
128 */
129 static inline int __gpio_is_inverted(int gpio)
130 {
131 if ((gpio_type == PXA26X_GPIO) && (gpio > 85))
132 return 1;
133 return 0;
134 }
135
136 /*
137 * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
138 * function of a GPIO, and GPDRx cannot be altered once configured. It
139 * is attributed as "occupied" here (I know this terminology isn't
140 * accurate, you are welcome to propose a better one :-)
141 */
142 static inline int __gpio_is_occupied(unsigned gpio)
143 {
144 struct pxa_gpio_chip *pxachip;
145 void __iomem *base;
146 unsigned long gafr = 0, gpdr = 0;
147 int ret, af = 0, dir = 0;
148
149 pxachip = gpio_to_pxachip(gpio);
150 base = gpio_chip_base(&pxachip->chip);
151 gpdr = readl_relaxed(base + GPDR_OFFSET);
152
153 switch (gpio_type) {
154 case PXA25X_GPIO:
155 case PXA26X_GPIO:
156 case PXA27X_GPIO:
157 gafr = readl_relaxed(base + GAFR_OFFSET);
158 af = (gafr >> ((gpio & 0xf) * 2)) & 0x3;
159 dir = gpdr & GPIO_bit(gpio);
160
161 if (__gpio_is_inverted(gpio))
162 ret = (af != 1) || (dir == 0);
163 else
164 ret = (af != 0) || (dir != 0);
165 break;
166 default:
167 ret = gpdr & GPIO_bit(gpio);
168 break;
169 }
170 return ret;
171 }
172
173 static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
174 {
175 return chip->base + offset + irq_base;
176 }
177
178 int pxa_irq_to_gpio(int irq)
179 {
180 return irq - irq_base;
181 }
182
183 static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
184 {
185 void __iomem *base = gpio_chip_base(chip);
186 uint32_t value, mask = 1 << offset;
187 unsigned long flags;
188
189 spin_lock_irqsave(&gpio_lock, flags);
190
191 value = readl_relaxed(base + GPDR_OFFSET);
192 if (__gpio_is_inverted(chip->base + offset))
193 value |= mask;
194 else
195 value &= ~mask;
196 writel_relaxed(value, base + GPDR_OFFSET);
197
198 spin_unlock_irqrestore(&gpio_lock, flags);
199 return 0;
200 }
201
202 static int pxa_gpio_direction_output(struct gpio_chip *chip,
203 unsigned offset, int value)
204 {
205 void __iomem *base = gpio_chip_base(chip);
206 uint32_t tmp, mask = 1 << offset;
207 unsigned long flags;
208
209 writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
210
211 spin_lock_irqsave(&gpio_lock, flags);
212
213 tmp = readl_relaxed(base + GPDR_OFFSET);
214 if (__gpio_is_inverted(chip->base + offset))
215 tmp &= ~mask;
216 else
217 tmp |= mask;
218 writel_relaxed(tmp, base + GPDR_OFFSET);
219
220 spin_unlock_irqrestore(&gpio_lock, flags);
221 return 0;
222 }
223
224 static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
225 {
226 return readl_relaxed(gpio_chip_base(chip) + GPLR_OFFSET) & (1 << offset);
227 }
228
229 static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
230 {
231 writel_relaxed(1 << offset, gpio_chip_base(chip) +
232 (value ? GPSR_OFFSET : GPCR_OFFSET));
233 }
234
235 #ifdef CONFIG_OF_GPIO
236 static int pxa_gpio_of_xlate(struct gpio_chip *gc,
237 const struct of_phandle_args *gpiospec,
238 u32 *flags)
239 {
240 if (gpiospec->args[0] > pxa_last_gpio)
241 return -EINVAL;
242
243 if (gc != &pxa_gpio_chips[gpiospec->args[0] / 32].chip)
244 return -EINVAL;
245
246 if (flags)
247 *flags = gpiospec->args[1];
248
249 return gpiospec->args[0] % 32;
250 }
251 #endif
252
253 static int pxa_init_gpio_chip(int gpio_end,
254 int (*set_wake)(unsigned int, unsigned int))
255 {
256 int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1;
257 struct pxa_gpio_chip *chips;
258
259 chips = kzalloc(nbanks * sizeof(struct pxa_gpio_chip), GFP_KERNEL);
260 if (chips == NULL) {
261 pr_err("%s: failed to allocate GPIO chips\n", __func__);
262 return -ENOMEM;
263 }
264
265 for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
266 struct gpio_chip *c = &chips[i].chip;
267
268 sprintf(chips[i].label, "gpio-%d", i);
269 chips[i].regbase = gpio_reg_base + BANK_OFF(i);
270 chips[i].set_wake = set_wake;
271
272 c->base = gpio;
273 c->label = chips[i].label;
274
275 c->direction_input = pxa_gpio_direction_input;
276 c->direction_output = pxa_gpio_direction_output;
277 c->get = pxa_gpio_get;
278 c->set = pxa_gpio_set;
279 c->to_irq = pxa_gpio_to_irq;
280 #ifdef CONFIG_OF_GPIO
281 c->of_node = pxa_gpio_of_node;
282 c->of_xlate = pxa_gpio_of_xlate;
283 c->of_gpio_n_cells = 2;
284 #endif
285
286 /* number of GPIOs on last bank may be less than 32 */
287 c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32;
288 gpiochip_add(c);
289 }
290 pxa_gpio_chips = chips;
291 return 0;
292 }
293
294 /* Update only those GRERx and GFERx edge detection register bits if those
295 * bits are set in c->irq_mask
296 */
297 static inline void update_edge_detect(struct pxa_gpio_chip *c)
298 {
299 uint32_t grer, gfer;
300
301 grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
302 gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
303 grer |= c->irq_edge_rise & c->irq_mask;
304 gfer |= c->irq_edge_fall & c->irq_mask;
305 writel_relaxed(grer, c->regbase + GRER_OFFSET);
306 writel_relaxed(gfer, c->regbase + GFER_OFFSET);
307 }
308
309 static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
310 {
311 struct pxa_gpio_chip *c;
312 int gpio = pxa_irq_to_gpio(d->irq);
313 unsigned long gpdr, mask = GPIO_bit(gpio);
314
315 c = gpio_to_pxachip(gpio);
316
317 if (type == IRQ_TYPE_PROBE) {
318 /* Don't mess with enabled GPIOs using preconfigured edges or
319 * GPIOs set to alternate function or to output during probe
320 */
321 if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
322 return 0;
323
324 if (__gpio_is_occupied(gpio))
325 return 0;
326
327 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
328 }
329
330 gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
331
332 if (__gpio_is_inverted(gpio))
333 writel_relaxed(gpdr | mask, c->regbase + GPDR_OFFSET);
334 else
335 writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);
336
337 if (type & IRQ_TYPE_EDGE_RISING)
338 c->irq_edge_rise |= mask;
339 else
340 c->irq_edge_rise &= ~mask;
341
342 if (type & IRQ_TYPE_EDGE_FALLING)
343 c->irq_edge_fall |= mask;
344 else
345 c->irq_edge_fall &= ~mask;
346
347 update_edge_detect(c);
348
349 pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,
350 ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
351 ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
352 return 0;
353 }
354
355 static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
356 {
357 struct pxa_gpio_chip *c;
358 int loop, gpio, gpio_base, n;
359 unsigned long gedr;
360 struct irq_chip *chip = irq_desc_get_chip(desc);
361
362 chained_irq_enter(chip, desc);
363
364 do {
365 loop = 0;
366 for_each_gpio_chip(gpio, c) {
367 gpio_base = c->chip.base;
368
369 gedr = readl_relaxed(c->regbase + GEDR_OFFSET);
370 gedr = gedr & c->irq_mask;
371 writel_relaxed(gedr, c->regbase + GEDR_OFFSET);
372
373 for_each_set_bit(n, &gedr, BITS_PER_LONG) {
374 loop = 1;
375
376 generic_handle_irq(gpio_to_irq(gpio_base + n));
377 }
378 }
379 } while (loop);
380
381 chained_irq_exit(chip, desc);
382 }
383
384 static void pxa_ack_muxed_gpio(struct irq_data *d)
385 {
386 int gpio = pxa_irq_to_gpio(d->irq);
387 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
388
389 writel_relaxed(GPIO_bit(gpio), c->regbase + GEDR_OFFSET);
390 }
391
392 static void pxa_mask_muxed_gpio(struct irq_data *d)
393 {
394 int gpio = pxa_irq_to_gpio(d->irq);
395 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
396 uint32_t grer, gfer;
397
398 c->irq_mask &= ~GPIO_bit(gpio);
399
400 grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio);
401 gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio);
402 writel_relaxed(grer, c->regbase + GRER_OFFSET);
403 writel_relaxed(gfer, c->regbase + GFER_OFFSET);
404 }
405
406 static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on)
407 {
408 int gpio = pxa_irq_to_gpio(d->irq);
409 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
410
411 if (c->set_wake)
412 return c->set_wake(gpio, on);
413 else
414 return 0;
415 }
416
417 static void pxa_unmask_muxed_gpio(struct irq_data *d)
418 {
419 int gpio = pxa_irq_to_gpio(d->irq);
420 struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
421
422 c->irq_mask |= GPIO_bit(gpio);
423 update_edge_detect(c);
424 }
425
426 static struct irq_chip pxa_muxed_gpio_chip = {
427 .name = "GPIO",
428 .irq_ack = pxa_ack_muxed_gpio,
429 .irq_mask = pxa_mask_muxed_gpio,
430 .irq_unmask = pxa_unmask_muxed_gpio,
431 .irq_set_type = pxa_gpio_irq_type,
432 .irq_set_wake = pxa_gpio_set_wake,
433 };
434
435 static int pxa_gpio_nums(void)
436 {
437 int count = 0;
438
439 #ifdef CONFIG_ARCH_PXA
440 if (cpu_is_pxa25x()) {
441 #ifdef CONFIG_CPU_PXA26x
442 count = 89;
443 gpio_type = PXA26X_GPIO;
444 #elif defined(CONFIG_PXA25x)
445 count = 84;
446 gpio_type = PXA26X_GPIO;
447 #endif /* CONFIG_CPU_PXA26x */
448 } else if (cpu_is_pxa27x()) {
449 count = 120;
450 gpio_type = PXA27X_GPIO;
451 } else if (cpu_is_pxa93x()) {
452 count = 191;
453 gpio_type = PXA93X_GPIO;
454 } else if (cpu_is_pxa3xx()) {
455 count = 127;
456 gpio_type = PXA3XX_GPIO;
457 }
458 #endif /* CONFIG_ARCH_PXA */
459
460 #ifdef CONFIG_ARCH_MMP
461 if (cpu_is_pxa168() || cpu_is_pxa910()) {
462 count = 127;
463 gpio_type = MMP_GPIO;
464 } else if (cpu_is_mmp2()) {
465 count = 191;
466 gpio_type = MMP_GPIO;
467 }
468 #endif /* CONFIG_ARCH_MMP */
469 return count;
470 }
471
472 #ifdef CONFIG_OF
473 static struct of_device_id pxa_gpio_dt_ids[] = {
474 { .compatible = "mrvl,pxa-gpio" },
475 { .compatible = "mrvl,mmp-gpio", .data = (void *)MMP_GPIO },
476 {}
477 };
478
479 static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,
480 irq_hw_number_t hw)
481 {
482 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
483 handle_edge_irq);
484 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
485 return 0;
486 }
487
488 const struct irq_domain_ops pxa_irq_domain_ops = {
489 .map = pxa_irq_domain_map,
490 .xlate = irq_domain_xlate_twocell,
491 };
492
493 static int pxa_gpio_probe_dt(struct platform_device *pdev)
494 {
495 int ret, nr_banks, nr_gpios;
496 struct device_node *prev, *next, *np = pdev->dev.of_node;
497 const struct of_device_id *of_id =
498 of_match_device(pxa_gpio_dt_ids, &pdev->dev);
499
500 if (!of_id) {
501 dev_err(&pdev->dev, "Failed to find gpio controller\n");
502 return -EFAULT;
503 }
504 gpio_type = (int)of_id->data;
505
506 next = of_get_next_child(np, NULL);
507 prev = next;
508 if (!next) {
509 dev_err(&pdev->dev, "Failed to find child gpio node\n");
510 ret = -EINVAL;
511 goto err;
512 }
513 for (nr_banks = 1; ; nr_banks++) {
514 next = of_get_next_child(np, prev);
515 if (!next)
516 break;
517 prev = next;
518 }
519 of_node_put(prev);
520 nr_gpios = nr_banks << 5;
521 pxa_last_gpio = nr_gpios - 1;
522
523 irq_base = irq_alloc_descs(-1, 0, nr_gpios, 0);
524 if (irq_base < 0) {
525 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
526 goto err;
527 }
528 domain = irq_domain_add_legacy(np, nr_gpios, irq_base, 0,
529 &pxa_irq_domain_ops, NULL);
530 pxa_gpio_of_node = np;
531 return 0;
532 err:
533 iounmap(gpio_reg_base);
534 return ret;
535 }
536 #else
537 #define pxa_gpio_probe_dt(pdev) (-1)
538 #endif
539
540 static int pxa_gpio_probe(struct platform_device *pdev)
541 {
542 struct pxa_gpio_chip *c;
543 struct resource *res;
544 struct clk *clk;
545 struct pxa_gpio_platform_data *info;
546 int gpio, irq, ret, use_of = 0;
547 int irq0 = 0, irq1 = 0, irq_mux, gpio_offset = 0;
548
549 ret = pxa_gpio_probe_dt(pdev);
550 if (ret < 0) {
551 pxa_last_gpio = pxa_gpio_nums();
552 #ifdef CONFIG_ARCH_PXA
553 if (gpio_is_pxa_type(gpio_type))
554 irq_base = PXA_GPIO_TO_IRQ(0);
555 #endif
556 #ifdef CONFIG_ARCH_MMP
557 if (gpio_is_mmp_type(gpio_type))
558 irq_base = MMP_GPIO_TO_IRQ(0);
559 #endif
560 } else {
561 use_of = 1;
562 }
563
564 if (!pxa_last_gpio)
565 return -EINVAL;
566
567 irq0 = platform_get_irq_byname(pdev, "gpio0");
568 irq1 = platform_get_irq_byname(pdev, "gpio1");
569 irq_mux = platform_get_irq_byname(pdev, "gpio_mux");
570 if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0)
571 || (irq_mux <= 0))
572 return -EINVAL;
573 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
574 if (!res)
575 return -EINVAL;
576 gpio_reg_base = ioremap(res->start, resource_size(res));
577 if (!gpio_reg_base)
578 return -EINVAL;
579
580 if (irq0 > 0)
581 gpio_offset = 2;
582
583 clk = clk_get(&pdev->dev, NULL);
584 if (IS_ERR(clk)) {
585 dev_err(&pdev->dev, "Error %ld to get gpio clock\n",
586 PTR_ERR(clk));
587 iounmap(gpio_reg_base);
588 return PTR_ERR(clk);
589 }
590 ret = clk_prepare_enable(clk);
591 if (ret) {
592 clk_put(clk);
593 iounmap(gpio_reg_base);
594 return ret;
595 }
596
597 /* Initialize GPIO chips */
598 info = dev_get_platdata(&pdev->dev);
599 pxa_init_gpio_chip(pxa_last_gpio, info ? info->gpio_set_wake : NULL);
600
601 /* clear all GPIO edge detects */
602 for_each_gpio_chip(gpio, c) {
603 writel_relaxed(0, c->regbase + GFER_OFFSET);
604 writel_relaxed(0, c->regbase + GRER_OFFSET);
605 writel_relaxed(~0,c->regbase + GEDR_OFFSET);
606 /* unmask GPIO edge detect for AP side */
607 if (gpio_is_mmp_type(gpio_type))
608 writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);
609 }
610
611 if (!use_of) {
612 #ifdef CONFIG_ARCH_PXA
613 irq = gpio_to_irq(0);
614 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
615 handle_edge_irq);
616 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
617 irq_set_chained_handler(IRQ_GPIO0, pxa_gpio_demux_handler);
618
619 irq = gpio_to_irq(1);
620 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
621 handle_edge_irq);
622 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
623 irq_set_chained_handler(IRQ_GPIO1, pxa_gpio_demux_handler);
624 #endif
625
626 for (irq = gpio_to_irq(gpio_offset);
627 irq <= gpio_to_irq(pxa_last_gpio); irq++) {
628 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
629 handle_edge_irq);
630 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
631 }
632 }
633
634 irq_set_chained_handler(irq_mux, pxa_gpio_demux_handler);
635 return 0;
636 }
637
638 static struct platform_driver pxa_gpio_driver = {
639 .probe = pxa_gpio_probe,
640 .driver = {
641 .name = "pxa-gpio",
642 .of_match_table = of_match_ptr(pxa_gpio_dt_ids),
643 },
644 };
645
646 static int __init pxa_gpio_init(void)
647 {
648 return platform_driver_register(&pxa_gpio_driver);
649 }
650 postcore_initcall(pxa_gpio_init);
651
652 #ifdef CONFIG_PM
653 static int pxa_gpio_suspend(void)
654 {
655 struct pxa_gpio_chip *c;
656 int gpio;
657
658 for_each_gpio_chip(gpio, c) {
659 c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);
660 c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
661 c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);
662 c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);
663
664 /* Clear GPIO transition detect bits */
665 writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);
666 }
667 return 0;
668 }
669
670 static void pxa_gpio_resume(void)
671 {
672 struct pxa_gpio_chip *c;
673 int gpio;
674
675 for_each_gpio_chip(gpio, c) {
676 /* restore level with set/clear */
677 writel_relaxed( c->saved_gplr, c->regbase + GPSR_OFFSET);
678 writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);
679
680 writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);
681 writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);
682 writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);
683 }
684 }
685 #else
686 #define pxa_gpio_suspend NULL
687 #define pxa_gpio_resume NULL
688 #endif
689
690 struct syscore_ops pxa_gpio_syscore_ops = {
691 .suspend = pxa_gpio_suspend,
692 .resume = pxa_gpio_resume,
693 };
694
695 static int __init pxa_gpio_sysinit(void)
696 {
697 register_syscore_ops(&pxa_gpio_syscore_ops);
698 return 0;
699 }
700 postcore_initcall(pxa_gpio_sysinit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree