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x86/boot: Rename overlapping memcpy() to memmove()
[linux/fpc-iii.git] / drivers / gpio / gpio-pxa.c
blob76ac906b4d78d262ab5473771e377c9c244b76b3
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/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/pinctrl/consumer.h>
28 #include <linux/platform_device.h>
29 #include <linux/syscore_ops.h>
30 #include <linux/slab.h>
31
32 /*
33 * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with
34 * one set of registers. The register offsets are organized below:
35 *
36 * GPLR GPDR GPSR GPCR GRER GFER GEDR
37 * BANK 0 - 0x0000 0x000C 0x0018 0x0024 0x0030 0x003C 0x0048
38 * BANK 1 - 0x0004 0x0010 0x001C 0x0028 0x0034 0x0040 0x004C
39 * BANK 2 - 0x0008 0x0014 0x0020 0x002C 0x0038 0x0044 0x0050
40 *
41 * BANK 3 - 0x0100 0x010C 0x0118 0x0124 0x0130 0x013C 0x0148
42 * BANK 4 - 0x0104 0x0110 0x011C 0x0128 0x0134 0x0140 0x014C
43 * BANK 5 - 0x0108 0x0114 0x0120 0x012C 0x0138 0x0144 0x0150
44 *
45 * BANK 6 - 0x0200 0x020C 0x0218 0x0224 0x0230 0x023C 0x0248
46 *
47 * NOTE:
48 * BANK 3 is only available on PXA27x and later processors.
49 * BANK 4 and 5 are only available on PXA935, PXA1928
50 * BANK 6 is only available on PXA1928
51 */
52
53 #define GPLR_OFFSET 0x00
54 #define GPDR_OFFSET 0x0C
55 #define GPSR_OFFSET 0x18
56 #define GPCR_OFFSET 0x24
57 #define GRER_OFFSET 0x30
58 #define GFER_OFFSET 0x3C
59 #define GEDR_OFFSET 0x48
60 #define GAFR_OFFSET 0x54
61 #define ED_MASK_OFFSET 0x9C /* GPIO edge detection for AP side */
62
63 #define BANK_OFF(n) (((n) / 3) << 8) + (((n) % 3) << 2)
64
65 int pxa_last_gpio;
66 static int irq_base;
67
68 struct pxa_gpio_bank {
69 void __iomem *regbase;
70 unsigned long irq_mask;
71 unsigned long irq_edge_rise;
72 unsigned long irq_edge_fall;
73
74 #ifdef CONFIG_PM
75 unsigned long saved_gplr;
76 unsigned long saved_gpdr;
77 unsigned long saved_grer;
78 unsigned long saved_gfer;
79 #endif
80 };
81
82 struct pxa_gpio_chip {
83 struct device *dev;
84 struct gpio_chip chip;
85 struct pxa_gpio_bank *banks;
86 struct irq_domain *irqdomain;
87
88 int irq0;
89 int irq1;
90 int (*set_wake)(unsigned int gpio, unsigned int on);
91 };
92
93 enum pxa_gpio_type {
94 PXA25X_GPIO = 0,
95 PXA26X_GPIO,
96 PXA27X_GPIO,
97 PXA3XX_GPIO,
98 PXA93X_GPIO,
99 MMP_GPIO = 0x10,
100 MMP2_GPIO,
101 PXA1928_GPIO,
102 };
103
104 struct pxa_gpio_id {
105 enum pxa_gpio_type type;
106 int gpio_nums;
107 };
108
109 static DEFINE_SPINLOCK(gpio_lock);
110 static struct pxa_gpio_chip *pxa_gpio_chip;
111 static enum pxa_gpio_type gpio_type;
112
113 static struct pxa_gpio_id pxa25x_id = {
114 .type = PXA25X_GPIO,
115 .gpio_nums = 85,
116 };
117
118 static struct pxa_gpio_id pxa26x_id = {
119 .type = PXA26X_GPIO,
120 .gpio_nums = 90,
121 };
122
123 static struct pxa_gpio_id pxa27x_id = {
124 .type = PXA27X_GPIO,
125 .gpio_nums = 121,
126 };
127
128 static struct pxa_gpio_id pxa3xx_id = {
129 .type = PXA3XX_GPIO,
130 .gpio_nums = 128,
131 };
132
133 static struct pxa_gpio_id pxa93x_id = {
134 .type = PXA93X_GPIO,
135 .gpio_nums = 192,
136 };
137
138 static struct pxa_gpio_id mmp_id = {
139 .type = MMP_GPIO,
140 .gpio_nums = 128,
141 };
142
143 static struct pxa_gpio_id mmp2_id = {
144 .type = MMP2_GPIO,
145 .gpio_nums = 192,
146 };
147
148 static struct pxa_gpio_id pxa1928_id = {
149 .type = PXA1928_GPIO,
150 .gpio_nums = 224,
151 };
152
153 #define for_each_gpio_bank(i, b, pc) \
154 for (i = 0, b = pc->banks; i <= pxa_last_gpio; i += 32, b++)
155
156 static inline struct pxa_gpio_chip *chip_to_pxachip(struct gpio_chip *c)
157 {
158 struct pxa_gpio_chip *pxa_chip = gpiochip_get_data(c);
159
160 return pxa_chip;
161 }
162
163 static inline void __iomem *gpio_bank_base(struct gpio_chip *c, int gpio)
164 {
165 struct pxa_gpio_chip *p = gpiochip_get_data(c);
166 struct pxa_gpio_bank *bank = p->banks + (gpio / 32);
167
168 return bank->regbase;
169 }
170
171 static inline struct pxa_gpio_bank *gpio_to_pxabank(struct gpio_chip *c,
172 unsigned gpio)
173 {
174 return chip_to_pxachip(c)->banks + gpio / 32;
175 }
176
177 static inline int gpio_is_pxa_type(int type)
178 {
179 return (type & MMP_GPIO) == 0;
180 }
181
182 static inline int gpio_is_mmp_type(int type)
183 {
184 return (type & MMP_GPIO) != 0;
185 }
186
187 /* GPIO86/87/88/89 on PXA26x have their direction bits in PXA_GPDR(2 inverted,
188 * as well as their Alternate Function value being '1' for GPIO in GAFRx.
189 */
190 static inline int __gpio_is_inverted(int gpio)
191 {
192 if ((gpio_type == PXA26X_GPIO) && (gpio > 85))
193 return 1;
194 return 0;
195 }
196
197 /*
198 * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
199 * function of a GPIO, and GPDRx cannot be altered once configured. It
200 * is attributed as "occupied" here (I know this terminology isn't
201 * accurate, you are welcome to propose a better one :-)
202 */
203 static inline int __gpio_is_occupied(struct pxa_gpio_chip *pchip, unsigned gpio)
204 {
205 void __iomem *base;
206 unsigned long gafr = 0, gpdr = 0;
207 int ret, af = 0, dir = 0;
208
209 base = gpio_bank_base(&pchip->chip, gpio);
210 gpdr = readl_relaxed(base + GPDR_OFFSET);
211
212 switch (gpio_type) {
213 case PXA25X_GPIO:
214 case PXA26X_GPIO:
215 case PXA27X_GPIO:
216 gafr = readl_relaxed(base + GAFR_OFFSET);
217 af = (gafr >> ((gpio & 0xf) * 2)) & 0x3;
218 dir = gpdr & GPIO_bit(gpio);
219
220 if (__gpio_is_inverted(gpio))
221 ret = (af != 1) || (dir == 0);
222 else
223 ret = (af != 0) || (dir != 0);
224 break;
225 default:
226 ret = gpdr & GPIO_bit(gpio);
227 break;
228 }
229 return ret;
230 }
231
232 int pxa_irq_to_gpio(int irq)
233 {
234 struct pxa_gpio_chip *pchip = pxa_gpio_chip;
235 int irq_gpio0;
236
237 irq_gpio0 = irq_find_mapping(pchip->irqdomain, 0);
238 if (irq_gpio0 > 0)
239 return irq - irq_gpio0;
240
241 return irq_gpio0;
242 }
243
244 static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
245 {
246 struct pxa_gpio_chip *pchip = chip_to_pxachip(chip);
247
248 return irq_find_mapping(pchip->irqdomain, offset);
249 }
250
251 static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
252 {
253 void __iomem *base = gpio_bank_base(chip, offset);
254 uint32_t value, mask = GPIO_bit(offset);
255 unsigned long flags;
256 int ret;
257
258 ret = pinctrl_gpio_direction_input(chip->base + offset);
259 if (!ret)
260 return 0;
261
262 spin_lock_irqsave(&gpio_lock, flags);
263
264 value = readl_relaxed(base + GPDR_OFFSET);
265 if (__gpio_is_inverted(chip->base + offset))
266 value |= mask;
267 else
268 value &= ~mask;
269 writel_relaxed(value, base + GPDR_OFFSET);
270
271 spin_unlock_irqrestore(&gpio_lock, flags);
272 return 0;
273 }
274
275 static int pxa_gpio_direction_output(struct gpio_chip *chip,
276 unsigned offset, int value)
277 {
278 void __iomem *base = gpio_bank_base(chip, offset);
279 uint32_t tmp, mask = GPIO_bit(offset);
280 unsigned long flags;
281 int ret;
282
283 writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
284
285 ret = pinctrl_gpio_direction_output(chip->base + offset);
286 if (ret)
287 return ret;
288
289 spin_lock_irqsave(&gpio_lock, flags);
290
291 tmp = readl_relaxed(base + GPDR_OFFSET);
292 if (__gpio_is_inverted(chip->base + offset))
293 tmp &= ~mask;
294 else
295 tmp |= mask;
296 writel_relaxed(tmp, base + GPDR_OFFSET);
297
298 spin_unlock_irqrestore(&gpio_lock, flags);
299 return 0;
300 }
301
302 static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
303 {
304 void __iomem *base = gpio_bank_base(chip, offset);
305 u32 gplr = readl_relaxed(base + GPLR_OFFSET);
306
307 return !!(gplr & GPIO_bit(offset));
308 }
309
310 static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
311 {
312 void __iomem *base = gpio_bank_base(chip, offset);
313
314 writel_relaxed(GPIO_bit(offset),
315 base + (value ? GPSR_OFFSET : GPCR_OFFSET));
316 }
317
318 #ifdef CONFIG_OF_GPIO
319 static int pxa_gpio_of_xlate(struct gpio_chip *gc,
320 const struct of_phandle_args *gpiospec,
321 u32 *flags)
322 {
323 if (gpiospec->args[0] > pxa_last_gpio)
324 return -EINVAL;
325
326 if (flags)
327 *flags = gpiospec->args[1];
328
329 return gpiospec->args[0];
330 }
331 #endif
332
333 static int pxa_gpio_request(struct gpio_chip *chip, unsigned int offset)
334 {
335 return pinctrl_request_gpio(chip->base + offset);
336 }
337
338 static void pxa_gpio_free(struct gpio_chip *chip, unsigned int offset)
339 {
340 pinctrl_free_gpio(chip->base + offset);
341 }
342
343 static int pxa_init_gpio_chip(struct pxa_gpio_chip *pchip, int ngpio,
344 struct device_node *np, void __iomem *regbase)
345 {
346 int i, gpio, nbanks = DIV_ROUND_UP(ngpio, 32);
347 struct pxa_gpio_bank *bank;
348
349 pchip->banks = devm_kcalloc(pchip->dev, nbanks, sizeof(*pchip->banks),
350 GFP_KERNEL);
351 if (!pchip->banks)
352 return -ENOMEM;
353
354 pchip->chip.label = "gpio-pxa";
355 pchip->chip.direction_input = pxa_gpio_direction_input;
356 pchip->chip.direction_output = pxa_gpio_direction_output;
357 pchip->chip.get = pxa_gpio_get;
358 pchip->chip.set = pxa_gpio_set;
359 pchip->chip.to_irq = pxa_gpio_to_irq;
360 pchip->chip.ngpio = ngpio;
361 pchip->chip.request = pxa_gpio_request;
362 pchip->chip.free = pxa_gpio_free;
363 #ifdef CONFIG_OF_GPIO
364 pchip->chip.of_node = np;
365 pchip->chip.of_xlate = pxa_gpio_of_xlate;
366 pchip->chip.of_gpio_n_cells = 2;
367 #endif
368
369 for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
370 bank = pchip->banks + i;
371 bank->regbase = regbase + BANK_OFF(i);
372 }
373
374 return gpiochip_add_data(&pchip->chip, pchip);
375 }
376
377 /* Update only those GRERx and GFERx edge detection register bits if those
378 * bits are set in c->irq_mask
379 */
380 static inline void update_edge_detect(struct pxa_gpio_bank *c)
381 {
382 uint32_t grer, gfer;
383
384 grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
385 gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
386 grer |= c->irq_edge_rise & c->irq_mask;
387 gfer |= c->irq_edge_fall & c->irq_mask;
388 writel_relaxed(grer, c->regbase + GRER_OFFSET);
389 writel_relaxed(gfer, c->regbase + GFER_OFFSET);
390 }
391
392 static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
393 {
394 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
395 unsigned int gpio = irqd_to_hwirq(d);
396 struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
397 unsigned long gpdr, mask = GPIO_bit(gpio);
398
399 if (type == IRQ_TYPE_PROBE) {
400 /* Don't mess with enabled GPIOs using preconfigured edges or
401 * GPIOs set to alternate function or to output during probe
402 */
403 if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
404 return 0;
405
406 if (__gpio_is_occupied(pchip, gpio))
407 return 0;
408
409 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
410 }
411
412 gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
413
414 if (__gpio_is_inverted(gpio))
415 writel_relaxed(gpdr | mask, c->regbase + GPDR_OFFSET);
416 else
417 writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);
418
419 if (type & IRQ_TYPE_EDGE_RISING)
420 c->irq_edge_rise |= mask;
421 else
422 c->irq_edge_rise &= ~mask;
423
424 if (type & IRQ_TYPE_EDGE_FALLING)
425 c->irq_edge_fall |= mask;
426 else
427 c->irq_edge_fall &= ~mask;
428
429 update_edge_detect(c);
430
431 pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,
432 ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
433 ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
434 return 0;
435 }
436
437 static irqreturn_t pxa_gpio_demux_handler(int in_irq, void *d)
438 {
439 int loop, gpio, n, handled = 0;
440 unsigned long gedr;
441 struct pxa_gpio_chip *pchip = d;
442 struct pxa_gpio_bank *c;
443
444 do {
445 loop = 0;
446 for_each_gpio_bank(gpio, c, pchip) {
447 gedr = readl_relaxed(c->regbase + GEDR_OFFSET);
448 gedr = gedr & c->irq_mask;
449 writel_relaxed(gedr, c->regbase + GEDR_OFFSET);
450
451 for_each_set_bit(n, &gedr, BITS_PER_LONG) {
452 loop = 1;
453
454 generic_handle_irq(gpio_to_irq(gpio + n));
455 }
456 }
457 handled += loop;
458 } while (loop);
459
460 return handled ? IRQ_HANDLED : IRQ_NONE;
461 }
462
463 static irqreturn_t pxa_gpio_direct_handler(int in_irq, void *d)
464 {
465 struct pxa_gpio_chip *pchip = d;
466
467 if (in_irq == pchip->irq0) {
468 generic_handle_irq(gpio_to_irq(0));
469 } else if (in_irq == pchip->irq1) {
470 generic_handle_irq(gpio_to_irq(1));
471 } else {
472 pr_err("%s() unknown irq %d\n", __func__, in_irq);
473 return IRQ_NONE;
474 }
475 return IRQ_HANDLED;
476 }
477
478 static void pxa_ack_muxed_gpio(struct irq_data *d)
479 {
480 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
481 unsigned int gpio = irqd_to_hwirq(d);
482 void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
483
484 writel_relaxed(GPIO_bit(gpio), base + GEDR_OFFSET);
485 }
486
487 static void pxa_mask_muxed_gpio(struct irq_data *d)
488 {
489 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
490 unsigned int gpio = irqd_to_hwirq(d);
491 struct pxa_gpio_bank *b = gpio_to_pxabank(&pchip->chip, gpio);
492 void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
493 uint32_t grer, gfer;
494
495 b->irq_mask &= ~GPIO_bit(gpio);
496
497 grer = readl_relaxed(base + GRER_OFFSET) & ~GPIO_bit(gpio);
498 gfer = readl_relaxed(base + GFER_OFFSET) & ~GPIO_bit(gpio);
499 writel_relaxed(grer, base + GRER_OFFSET);
500 writel_relaxed(gfer, base + GFER_OFFSET);
501 }
502
503 static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on)
504 {
505 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
506 unsigned int gpio = irqd_to_hwirq(d);
507
508 if (pchip->set_wake)
509 return pchip->set_wake(gpio, on);
510 else
511 return 0;
512 }
513
514 static void pxa_unmask_muxed_gpio(struct irq_data *d)
515 {
516 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
517 unsigned int gpio = irqd_to_hwirq(d);
518 struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
519
520 c->irq_mask |= GPIO_bit(gpio);
521 update_edge_detect(c);
522 }
523
524 static struct irq_chip pxa_muxed_gpio_chip = {
525 .name = "GPIO",
526 .irq_ack = pxa_ack_muxed_gpio,
527 .irq_mask = pxa_mask_muxed_gpio,
528 .irq_unmask = pxa_unmask_muxed_gpio,
529 .irq_set_type = pxa_gpio_irq_type,
530 .irq_set_wake = pxa_gpio_set_wake,
531 };
532
533 static int pxa_gpio_nums(struct platform_device *pdev)
534 {
535 const struct platform_device_id *id = platform_get_device_id(pdev);
536 struct pxa_gpio_id *pxa_id = (struct pxa_gpio_id *)id->driver_data;
537 int count = 0;
538
539 switch (pxa_id->type) {
540 case PXA25X_GPIO:
541 case PXA26X_GPIO:
542 case PXA27X_GPIO:
543 case PXA3XX_GPIO:
544 case PXA93X_GPIO:
545 case MMP_GPIO:
546 case MMP2_GPIO:
547 case PXA1928_GPIO:
548 gpio_type = pxa_id->type;
549 count = pxa_id->gpio_nums - 1;
550 break;
551 default:
552 count = -EINVAL;
553 break;
554 }
555 return count;
556 }
557
558 static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,
559 irq_hw_number_t hw)
560 {
561 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
562 handle_edge_irq);
563 irq_set_chip_data(irq, d->host_data);
564 irq_set_noprobe(irq);
565 return 0;
566 }
567
568 const struct irq_domain_ops pxa_irq_domain_ops = {
569 .map = pxa_irq_domain_map,
570 .xlate = irq_domain_xlate_twocell,
571 };
572
573 #ifdef CONFIG_OF
574 static const struct of_device_id pxa_gpio_dt_ids[] = {
575 { .compatible = "intel,pxa25x-gpio", .data = &pxa25x_id, },
576 { .compatible = "intel,pxa26x-gpio", .data = &pxa26x_id, },
577 { .compatible = "intel,pxa27x-gpio", .data = &pxa27x_id, },
578 { .compatible = "intel,pxa3xx-gpio", .data = &pxa3xx_id, },
579 { .compatible = "marvell,pxa93x-gpio", .data = &pxa93x_id, },
580 { .compatible = "marvell,mmp-gpio", .data = &mmp_id, },
581 { .compatible = "marvell,mmp2-gpio", .data = &mmp2_id, },
582 { .compatible = "marvell,pxa1928-gpio", .data = &pxa1928_id, },
583 {}
584 };
585
586 static int pxa_gpio_probe_dt(struct platform_device *pdev,
587 struct pxa_gpio_chip *pchip)
588 {
589 int nr_gpios;
590 const struct of_device_id *of_id =
591 of_match_device(pxa_gpio_dt_ids, &pdev->dev);
592 const struct pxa_gpio_id *gpio_id;
593
594 if (!of_id || !of_id->data) {
595 dev_err(&pdev->dev, "Failed to find gpio controller\n");
596 return -EFAULT;
597 }
598 gpio_id = of_id->data;
599 gpio_type = gpio_id->type;
600
601 nr_gpios = gpio_id->gpio_nums;
602 pxa_last_gpio = nr_gpios - 1;
603
604 irq_base = irq_alloc_descs(-1, 0, nr_gpios, 0);
605 if (irq_base < 0) {
606 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
607 return irq_base;
608 }
609 return irq_base;
610 }
611 #else
612 #define pxa_gpio_probe_dt(pdev, pchip) (-1)
613 #endif
614
615 static int pxa_gpio_probe(struct platform_device *pdev)
616 {
617 struct pxa_gpio_chip *pchip;
618 struct pxa_gpio_bank *c;
619 struct resource *res;
620 struct clk *clk;
621 struct pxa_gpio_platform_data *info;
622 void __iomem *gpio_reg_base;
623 int gpio, ret;
624 int irq0 = 0, irq1 = 0, irq_mux, gpio_offset = 0;
625
626 pchip = devm_kzalloc(&pdev->dev, sizeof(*pchip), GFP_KERNEL);
627 if (!pchip)
628 return -ENOMEM;
629 pchip->dev = &pdev->dev;
630
631 info = dev_get_platdata(&pdev->dev);
632 if (info) {
633 irq_base = info->irq_base;
634 if (irq_base <= 0)
635 return -EINVAL;
636 pxa_last_gpio = pxa_gpio_nums(pdev);
637 pchip->set_wake = info->gpio_set_wake;
638 } else {
639 irq_base = pxa_gpio_probe_dt(pdev, pchip);
640 if (irq_base < 0)
641 return -EINVAL;
642 }
643
644 if (!pxa_last_gpio)
645 return -EINVAL;
646
647 pchip->irqdomain = irq_domain_add_legacy(pdev->dev.of_node,
648 pxa_last_gpio + 1, irq_base,
649 0, &pxa_irq_domain_ops, pchip);
650 if (!pchip->irqdomain)
651 return -ENOMEM;
652
653 irq0 = platform_get_irq_byname(pdev, "gpio0");
654 irq1 = platform_get_irq_byname(pdev, "gpio1");
655 irq_mux = platform_get_irq_byname(pdev, "gpio_mux");
656 if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0)
657 || (irq_mux <= 0))
658 return -EINVAL;
659
660 pchip->irq0 = irq0;
661 pchip->irq1 = irq1;
662 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
663 gpio_reg_base = devm_ioremap(&pdev->dev, res->start,
664 resource_size(res));
665 if (!gpio_reg_base)
666 return -EINVAL;
667
668 if (irq0 > 0)
669 gpio_offset = 2;
670
671 clk = clk_get(&pdev->dev, NULL);
672 if (IS_ERR(clk)) {
673 dev_err(&pdev->dev, "Error %ld to get gpio clock\n",
674 PTR_ERR(clk));
675 return PTR_ERR(clk);
676 }
677 ret = clk_prepare_enable(clk);
678 if (ret) {
679 clk_put(clk);
680 return ret;
681 }
682
683 /* Initialize GPIO chips */
684 ret = pxa_init_gpio_chip(pchip, pxa_last_gpio + 1, pdev->dev.of_node,
685 gpio_reg_base);
686 if (ret) {
687 clk_put(clk);
688 return ret;
689 }
690
691 /* clear all GPIO edge detects */
692 for_each_gpio_bank(gpio, c, pchip) {
693 writel_relaxed(0, c->regbase + GFER_OFFSET);
694 writel_relaxed(0, c->regbase + GRER_OFFSET);
695 writel_relaxed(~0, c->regbase + GEDR_OFFSET);
696 /* unmask GPIO edge detect for AP side */
697 if (gpio_is_mmp_type(gpio_type))
698 writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);
699 }
700
701 if (irq0 > 0) {
702 ret = devm_request_irq(&pdev->dev,
703 irq0, pxa_gpio_direct_handler, 0,
704 "gpio-0", pchip);
705 if (ret)
706 dev_err(&pdev->dev, "request of gpio0 irq failed: %d\n",
707 ret);
708 }
709 if (irq1 > 0) {
710 ret = devm_request_irq(&pdev->dev,
711 irq1, pxa_gpio_direct_handler, 0,
712 "gpio-1", pchip);
713 if (ret)
714 dev_err(&pdev->dev, "request of gpio1 irq failed: %d\n",
715 ret);
716 }
717 ret = devm_request_irq(&pdev->dev,
718 irq_mux, pxa_gpio_demux_handler, 0,
719 "gpio-mux", pchip);
720 if (ret)
721 dev_err(&pdev->dev, "request of gpio-mux irq failed: %d\n",
722 ret);
723
724 pxa_gpio_chip = pchip;
725
726 return 0;
727 }
728
729 static const struct platform_device_id gpio_id_table[] = {
730 { "pxa25x-gpio", (unsigned long)&pxa25x_id },
731 { "pxa26x-gpio", (unsigned long)&pxa26x_id },
732 { "pxa27x-gpio", (unsigned long)&pxa27x_id },
733 { "pxa3xx-gpio", (unsigned long)&pxa3xx_id },
734 { "pxa93x-gpio", (unsigned long)&pxa93x_id },
735 { "mmp-gpio", (unsigned long)&mmp_id },
736 { "mmp2-gpio", (unsigned long)&mmp2_id },
737 { "pxa1928-gpio", (unsigned long)&pxa1928_id },
738 { },
739 };
740
741 static struct platform_driver pxa_gpio_driver = {
742 .probe = pxa_gpio_probe,
743 .driver = {
744 .name = "pxa-gpio",
745 .of_match_table = of_match_ptr(pxa_gpio_dt_ids),
746 },
747 .id_table = gpio_id_table,
748 };
749
750 static int __init pxa_gpio_legacy_init(void)
751 {
752 if (of_have_populated_dt())
753 return 0;
754
755 return platform_driver_register(&pxa_gpio_driver);
756 }
757 postcore_initcall(pxa_gpio_legacy_init);
758
759 static int __init pxa_gpio_dt_init(void)
760 {
761 if (of_have_populated_dt())
762 return platform_driver_register(&pxa_gpio_driver);
763
764 return 0;
765 }
766 device_initcall(pxa_gpio_dt_init);
767
768 #ifdef CONFIG_PM
769 static int pxa_gpio_suspend(void)
770 {
771 struct pxa_gpio_chip *pchip = pxa_gpio_chip;
772 struct pxa_gpio_bank *c;
773 int gpio;
774
775 for_each_gpio_bank(gpio, c, pchip) {
776 c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);
777 c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
778 c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);
779 c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);
780
781 /* Clear GPIO transition detect bits */
782 writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);
783 }
784 return 0;
785 }
786
787 static void pxa_gpio_resume(void)
788 {
789 struct pxa_gpio_chip *pchip = pxa_gpio_chip;
790 struct pxa_gpio_bank *c;
791 int gpio;
792
793 for_each_gpio_bank(gpio, c, pchip) {
794 /* restore level with set/clear */
795 writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET);
796 writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);
797
798 writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);
799 writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);
800 writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);
801 }
802 }
803 #else
804 #define pxa_gpio_suspend NULL
805 #define pxa_gpio_resume NULL
806 #endif
807
808 struct syscore_ops pxa_gpio_syscore_ops = {
809 .suspend = pxa_gpio_suspend,
810 .resume = pxa_gpio_resume,
811 };
812
813 static int __init pxa_gpio_sysinit(void)
814 {
815 register_syscore_ops(&pxa_gpio_syscore_ops);
816 return 0;
817 }
818 postcore_initcall(pxa_gpio_sysinit);
Linux with added FPC-III support