1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/plat-pxa/gpio.c
4 *
5 * Generic PXA GPIO handling
6 *
7 * Author: Nicolas Pitre
8 * Created: Jun 15, 2001
9 * Copyright: MontaVista Software Inc.
10 */
11 #include <linux/module.h>
12 #include <linux/clk.h>
13 #include <linux/err.h>
14 #include <linux/gpio/driver.h>
15 #include <linux/gpio-pxa.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/irq.h>
19 #include <linux/irqdomain.h>
20 #include <linux/irqchip/chained_irq.h>
21 #include <linux/io.h>
22 #include <linux/of.h>
23 #include <linux/pinctrl/consumer.h>
24 #include <linux/platform_device.h>
25 #include <linux/syscore_ops.h>
26 #include <linux/slab.h>
27
28 /*
29 * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with
30 * one set of registers. The register offsets are organized below:
31 *
32 * GPLR GPDR GPSR GPCR GRER GFER GEDR
33 * BANK 0 - 0x0000 0x000C 0x0018 0x0024 0x0030 0x003C 0x0048
34 * BANK 1 - 0x0004 0x0010 0x001C 0x0028 0x0034 0x0040 0x004C
35 * BANK 2 - 0x0008 0x0014 0x0020 0x002C 0x0038 0x0044 0x0050
36 *
37 * BANK 3 - 0x0100 0x010C 0x0118 0x0124 0x0130 0x013C 0x0148
38 * BANK 4 - 0x0104 0x0110 0x011C 0x0128 0x0134 0x0140 0x014C
39 * BANK 5 - 0x0108 0x0114 0x0120 0x012C 0x0138 0x0144 0x0150
40 *
41 * BANK 6 - 0x0200 0x020C 0x0218 0x0224 0x0230 0x023C 0x0248
42 *
43 * NOTE:
44 * BANK 3 is only available on PXA27x and later processors.
45 * BANK 4 and 5 are only available on PXA935, PXA1928
46 * BANK 6 is only available on PXA1928
47 */
48
49 #define GPLR_OFFSET 0x00
50 #define GPDR_OFFSET 0x0C
51 #define GPSR_OFFSET 0x18
52 #define GPCR_OFFSET 0x24
53 #define GRER_OFFSET 0x30
54 #define GFER_OFFSET 0x3C
55 #define GEDR_OFFSET 0x48
56 #define GAFR_OFFSET 0x54
57 #define ED_MASK_OFFSET 0x9C /* GPIO edge detection for AP side */
58
59 #define BANK_OFF(n) (((n) / 3) << 8) + (((n) % 3) << 2)
60
61 int pxa_last_gpio;
62 static int irq_base;
63
64 struct pxa_gpio_bank {
65 void __iomem *regbase;
66 unsigned long irq_mask;
67 unsigned long irq_edge_rise;
68 unsigned long irq_edge_fall;
69
70 #ifdef CONFIG_PM
71 unsigned long saved_gplr;
72 unsigned long saved_gpdr;
73 unsigned long saved_grer;
74 unsigned long saved_gfer;
75 #endif
76 };
77
78 struct pxa_gpio_chip {
79 struct device *dev;
80 struct gpio_chip chip;
81 struct pxa_gpio_bank *banks;
82 struct irq_domain *irqdomain;
83
84 int irq0;
85 int irq1;
86 int (*set_wake)(unsigned int gpio, unsigned int on);
87 };
88
89 enum pxa_gpio_type {
90 PXA25X_GPIO = 0,
91 PXA26X_GPIO,
92 PXA27X_GPIO,
93 PXA3XX_GPIO,
94 PXA93X_GPIO,
95 MMP_GPIO = 0x10,
96 MMP2_GPIO,
97 PXA1928_GPIO,
98 };
99
100 struct pxa_gpio_id {
101 enum pxa_gpio_type type;
102 int gpio_nums;
103 };
104
105 static DEFINE_SPINLOCK(gpio_lock);
106 static struct pxa_gpio_chip *pxa_gpio_chip;
107 static enum pxa_gpio_type gpio_type;
108
109 static struct pxa_gpio_id pxa25x_id = {
110 .type = PXA25X_GPIO,
111 .gpio_nums = 85,
112 };
113
114 static struct pxa_gpio_id pxa26x_id = {
115 .type = PXA26X_GPIO,
116 .gpio_nums = 90,
117 };
118
119 static struct pxa_gpio_id pxa27x_id = {
120 .type = PXA27X_GPIO,
121 .gpio_nums = 121,
122 };
123
124 static struct pxa_gpio_id pxa3xx_id = {
125 .type = PXA3XX_GPIO,
126 .gpio_nums = 128,
127 };
128
129 static struct pxa_gpio_id pxa93x_id = {
130 .type = PXA93X_GPIO,
131 .gpio_nums = 192,
132 };
133
134 static struct pxa_gpio_id mmp_id = {
135 .type = MMP_GPIO,
136 .gpio_nums = 128,
137 };
138
139 static struct pxa_gpio_id mmp2_id = {
140 .type = MMP2_GPIO,
141 .gpio_nums = 192,
142 };
143
144 static struct pxa_gpio_id pxa1928_id = {
145 .type = PXA1928_GPIO,
146 .gpio_nums = 224,
147 };
148
149 #define for_each_gpio_bank(i, b, pc) \
150 for (i = 0, b = pc->banks; i <= pxa_last_gpio; i += 32, b++)
151
chip_to_pxachip(struct gpio_chip * c)152 static inline struct pxa_gpio_chip *chip_to_pxachip(struct gpio_chip *c)
153 {
154 struct pxa_gpio_chip *pxa_chip = gpiochip_get_data(c);
155
156 return pxa_chip;
157 }
158
gpio_bank_base(struct gpio_chip * c,int gpio)159 static inline void __iomem *gpio_bank_base(struct gpio_chip *c, int gpio)
160 {
161 struct pxa_gpio_chip *p = gpiochip_get_data(c);
162 struct pxa_gpio_bank *bank = p->banks + (gpio / 32);
163
164 return bank->regbase;
165 }
166
gpio_to_pxabank(struct gpio_chip * c,unsigned gpio)167 static inline struct pxa_gpio_bank *gpio_to_pxabank(struct gpio_chip *c,
168 unsigned gpio)
169 {
170 return chip_to_pxachip(c)->banks + gpio / 32;
171 }
172
gpio_is_mmp_type(int type)173 static inline int gpio_is_mmp_type(int type)
174 {
175 return (type & MMP_GPIO) != 0;
176 }
177
178 /* GPIO86/87/88/89 on PXA26x have their direction bits in PXA_GPDR(2 inverted,
179 * as well as their Alternate Function value being '1' for GPIO in GAFRx.
180 */
__gpio_is_inverted(int gpio)181 static inline int __gpio_is_inverted(int gpio)
182 {
183 if ((gpio_type == PXA26X_GPIO) && (gpio > 85))
184 return 1;
185 return 0;
186 }
187
188 /*
189 * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
190 * function of a GPIO, and GPDRx cannot be altered once configured. It
191 * is attributed as "occupied" here (I know this terminology isn't
192 * accurate, you are welcome to propose a better one :-)
193 */
__gpio_is_occupied(struct pxa_gpio_chip * pchip,unsigned gpio)194 static inline int __gpio_is_occupied(struct pxa_gpio_chip *pchip, unsigned gpio)
195 {
196 void __iomem *base;
197 unsigned long gafr = 0, gpdr = 0;
198 int ret, af = 0, dir = 0;
199
200 base = gpio_bank_base(&pchip->chip, gpio);
201 gpdr = readl_relaxed(base + GPDR_OFFSET);
202
203 switch (gpio_type) {
204 case PXA25X_GPIO:
205 case PXA26X_GPIO:
206 case PXA27X_GPIO:
207 gafr = readl_relaxed(base + GAFR_OFFSET);
208 af = (gafr >> ((gpio & 0xf) * 2)) & 0x3;
209 dir = gpdr & GPIO_bit(gpio);
210
211 if (__gpio_is_inverted(gpio))
212 ret = (af != 1) || (dir == 0);
213 else
214 ret = (af != 0) || (dir != 0);
215 break;
216 default:
217 ret = gpdr & GPIO_bit(gpio);
218 break;
219 }
220 return ret;
221 }
222
pxa_irq_to_gpio(int irq)223 int pxa_irq_to_gpio(int irq)
224 {
225 struct pxa_gpio_chip *pchip = pxa_gpio_chip;
226 int irq_gpio0;
227
228 irq_gpio0 = irq_find_mapping(pchip->irqdomain, 0);
229 if (irq_gpio0 > 0)
230 return irq - irq_gpio0;
231
232 return irq_gpio0;
233 }
234
pxa_gpio_has_pinctrl(void)235 static bool pxa_gpio_has_pinctrl(void)
236 {
237 switch (gpio_type) {
238 case PXA3XX_GPIO:
239 case MMP2_GPIO:
240 case MMP_GPIO:
241 return false;
242
243 default:
244 return true;
245 }
246 }
247
pxa_gpio_to_irq(struct gpio_chip * chip,unsigned offset)248 static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
249 {
250 struct pxa_gpio_chip *pchip = chip_to_pxachip(chip);
251
252 return irq_find_mapping(pchip->irqdomain, offset);
253 }
254
pxa_gpio_direction_input(struct gpio_chip * chip,unsigned offset)255 static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
256 {
257 void __iomem *base = gpio_bank_base(chip, offset);
258 uint32_t value, mask = GPIO_bit(offset);
259 unsigned long flags;
260 int ret;
261
262 if (pxa_gpio_has_pinctrl()) {
263 ret = pinctrl_gpio_direction_input(chip, offset);
264 if (ret)
265 return ret;
266 }
267
268 spin_lock_irqsave(&gpio_lock, flags);
269
270 value = readl_relaxed(base + GPDR_OFFSET);
271 if (__gpio_is_inverted(chip->base + offset))
272 value |= mask;
273 else
274 value &= ~mask;
275 writel_relaxed(value, base + GPDR_OFFSET);
276
277 spin_unlock_irqrestore(&gpio_lock, flags);
278 return 0;
279 }
280
pxa_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)281 static int pxa_gpio_direction_output(struct gpio_chip *chip,
282 unsigned offset, int value)
283 {
284 void __iomem *base = gpio_bank_base(chip, offset);
285 uint32_t tmp, mask = GPIO_bit(offset);
286 unsigned long flags;
287 int ret;
288
289 writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
290
291 if (pxa_gpio_has_pinctrl()) {
292 ret = pinctrl_gpio_direction_output(chip, offset);
293 if (ret)
294 return ret;
295 }
296
297 spin_lock_irqsave(&gpio_lock, flags);
298
299 tmp = readl_relaxed(base + GPDR_OFFSET);
300 if (__gpio_is_inverted(chip->base + offset))
301 tmp &= ~mask;
302 else
303 tmp |= mask;
304 writel_relaxed(tmp, base + GPDR_OFFSET);
305
306 spin_unlock_irqrestore(&gpio_lock, flags);
307 return 0;
308 }
309
pxa_gpio_get(struct gpio_chip * chip,unsigned offset)310 static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
311 {
312 void __iomem *base = gpio_bank_base(chip, offset);
313 u32 gplr = readl_relaxed(base + GPLR_OFFSET);
314
315 return !!(gplr & GPIO_bit(offset));
316 }
317
pxa_gpio_set(struct gpio_chip * chip,unsigned offset,int value)318 static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
319 {
320 void __iomem *base = gpio_bank_base(chip, offset);
321
322 writel_relaxed(GPIO_bit(offset),
323 base + (value ? GPSR_OFFSET : GPCR_OFFSET));
324 }
325
326 #ifdef CONFIG_OF_GPIO
pxa_gpio_of_xlate(struct gpio_chip * gc,const struct of_phandle_args * gpiospec,u32 * flags)327 static int pxa_gpio_of_xlate(struct gpio_chip *gc,
328 const struct of_phandle_args *gpiospec,
329 u32 *flags)
330 {
331 if (gpiospec->args[0] > pxa_last_gpio)
332 return -EINVAL;
333
334 if (flags)
335 *flags = gpiospec->args[1];
336
337 return gpiospec->args[0];
338 }
339 #endif
340
pxa_init_gpio_chip(struct pxa_gpio_chip * pchip,int ngpio,void __iomem * regbase)341 static int pxa_init_gpio_chip(struct pxa_gpio_chip *pchip, int ngpio, void __iomem *regbase)
342 {
343 int i, gpio, nbanks = DIV_ROUND_UP(ngpio, 32);
344 struct pxa_gpio_bank *bank;
345
346 pchip->banks = devm_kcalloc(pchip->dev, nbanks, sizeof(*pchip->banks),
347 GFP_KERNEL);
348 if (!pchip->banks)
349 return -ENOMEM;
350
351 pchip->chip.parent = pchip->dev;
352 pchip->chip.label = "gpio-pxa";
353 pchip->chip.direction_input = pxa_gpio_direction_input;
354 pchip->chip.direction_output = pxa_gpio_direction_output;
355 pchip->chip.get = pxa_gpio_get;
356 pchip->chip.set = pxa_gpio_set;
357 pchip->chip.to_irq = pxa_gpio_to_irq;
358 pchip->chip.ngpio = ngpio;
359 pchip->chip.request = gpiochip_generic_request;
360 pchip->chip.free = gpiochip_generic_free;
361
362 #ifdef CONFIG_OF_GPIO
363 pchip->chip.of_xlate = pxa_gpio_of_xlate;
364 pchip->chip.of_gpio_n_cells = 2;
365 #endif
366
367 for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
368 bank = pchip->banks + i;
369 bank->regbase = regbase + BANK_OFF(i);
370 }
371
372 return gpiochip_add_data(&pchip->chip, pchip);
373 }
374
375 /* Update only those GRERx and GFERx edge detection register bits if those
376 * bits are set in c->irq_mask
377 */
update_edge_detect(struct pxa_gpio_bank * c)378 static inline void update_edge_detect(struct pxa_gpio_bank *c)
379 {
380 uint32_t grer, gfer;
381
382 grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
383 gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
384 grer |= c->irq_edge_rise & c->irq_mask;
385 gfer |= c->irq_edge_fall & c->irq_mask;
386 writel_relaxed(grer, c->regbase + GRER_OFFSET);
387 writel_relaxed(gfer, c->regbase + GFER_OFFSET);
388 }
389
pxa_gpio_irq_type(struct irq_data * d,unsigned int type)390 static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
391 {
392 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
393 unsigned int gpio = irqd_to_hwirq(d);
394 struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
395 unsigned long gpdr, mask = GPIO_bit(gpio);
396
397 if (type == IRQ_TYPE_PROBE) {
398 /* Don't mess with enabled GPIOs using preconfigured edges or
399 * GPIOs set to alternate function or to output during probe
400 */
401 if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
402 return 0;
403
404 if (__gpio_is_occupied(pchip, gpio))
405 return 0;
406
407 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
408 }
409
410 gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
411
412 if (__gpio_is_inverted(gpio))
413 writel_relaxed(gpdr | mask, c->regbase + GPDR_OFFSET);
414 else
415 writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);
416
417 if (type & IRQ_TYPE_EDGE_RISING)
418 c->irq_edge_rise |= mask;
419 else
420 c->irq_edge_rise &= ~mask;
421
422 if (type & IRQ_TYPE_EDGE_FALLING)
423 c->irq_edge_fall |= mask;
424 else
425 c->irq_edge_fall &= ~mask;
426
427 update_edge_detect(c);
428
429 pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,
430 ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
431 ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
432 return 0;
433 }
434
pxa_gpio_demux_handler(int in_irq,void * d)435 static irqreturn_t pxa_gpio_demux_handler(int in_irq, void *d)
436 {
437 int loop, gpio, n, handled = 0;
438 unsigned long gedr;
439 struct pxa_gpio_chip *pchip = d;
440 struct pxa_gpio_bank *c;
441
442 do {
443 loop = 0;
444 for_each_gpio_bank(gpio, c, pchip) {
445 gedr = readl_relaxed(c->regbase + GEDR_OFFSET);
446 gedr = gedr & c->irq_mask;
447 writel_relaxed(gedr, c->regbase + GEDR_OFFSET);
448
449 for_each_set_bit(n, &gedr, BITS_PER_LONG) {
450 loop = 1;
451
452 generic_handle_domain_irq(pchip->irqdomain,
453 gpio + n);
454 }
455 }
456 handled += loop;
457 } while (loop);
458
459 return handled ? IRQ_HANDLED : IRQ_NONE;
460 }
461
pxa_gpio_direct_handler(int in_irq,void * d)462 static irqreturn_t pxa_gpio_direct_handler(int in_irq, void *d)
463 {
464 struct pxa_gpio_chip *pchip = d;
465
466 if (in_irq == pchip->irq0) {
467 generic_handle_domain_irq(pchip->irqdomain, 0);
468 } else if (in_irq == pchip->irq1) {
469 generic_handle_domain_irq(pchip->irqdomain, 1);
470 } else {
471 pr_err("%s() unknown irq %d\n", __func__, in_irq);
472 return IRQ_NONE;
473 }
474 return IRQ_HANDLED;
475 }
476
pxa_ack_muxed_gpio(struct irq_data * d)477 static void pxa_ack_muxed_gpio(struct irq_data *d)
478 {
479 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
480 unsigned int gpio = irqd_to_hwirq(d);
481 void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
482
483 writel_relaxed(GPIO_bit(gpio), base + GEDR_OFFSET);
484 }
485
pxa_mask_muxed_gpio(struct irq_data * d)486 static void pxa_mask_muxed_gpio(struct irq_data *d)
487 {
488 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
489 unsigned int gpio = irqd_to_hwirq(d);
490 struct pxa_gpio_bank *b = gpio_to_pxabank(&pchip->chip, gpio);
491 void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
492 uint32_t grer, gfer;
493
494 b->irq_mask &= ~GPIO_bit(gpio);
495
496 grer = readl_relaxed(base + GRER_OFFSET) & ~GPIO_bit(gpio);
497 gfer = readl_relaxed(base + GFER_OFFSET) & ~GPIO_bit(gpio);
498 writel_relaxed(grer, base + GRER_OFFSET);
499 writel_relaxed(gfer, base + GFER_OFFSET);
500 }
501
pxa_gpio_set_wake(struct irq_data * d,unsigned int on)502 static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on)
503 {
504 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
505 unsigned int gpio = irqd_to_hwirq(d);
506
507 if (pchip->set_wake)
508 return pchip->set_wake(gpio, on);
509 else
510 return 0;
511 }
512
pxa_unmask_muxed_gpio(struct irq_data * d)513 static void pxa_unmask_muxed_gpio(struct irq_data *d)
514 {
515 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
516 unsigned int gpio = irqd_to_hwirq(d);
517 struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
518
519 c->irq_mask |= GPIO_bit(gpio);
520 update_edge_detect(c);
521 }
522
523 static struct irq_chip pxa_muxed_gpio_chip = {
524 .name = "GPIO",
525 .irq_ack = pxa_ack_muxed_gpio,
526 .irq_mask = pxa_mask_muxed_gpio,
527 .irq_unmask = pxa_unmask_muxed_gpio,
528 .irq_set_type = pxa_gpio_irq_type,
529 .irq_set_wake = pxa_gpio_set_wake,
530 };
531
pxa_gpio_nums(struct platform_device * pdev)532 static int pxa_gpio_nums(struct platform_device *pdev)
533 {
534 const struct platform_device_id *id = platform_get_device_id(pdev);
535 struct pxa_gpio_id *pxa_id = (struct pxa_gpio_id *)id->driver_data;
536 int count = 0;
537
538 switch (pxa_id->type) {
539 case PXA25X_GPIO:
540 case PXA26X_GPIO:
541 case PXA27X_GPIO:
542 case PXA3XX_GPIO:
543 case PXA93X_GPIO:
544 case MMP_GPIO:
545 case MMP2_GPIO:
546 case PXA1928_GPIO:
547 gpio_type = pxa_id->type;
548 count = pxa_id->gpio_nums - 1;
549 break;
550 default:
551 count = -EINVAL;
552 break;
553 }
554 return count;
555 }
556
pxa_irq_domain_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)557 static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,
558 irq_hw_number_t hw)
559 {
560 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
561 handle_edge_irq);
562 irq_set_chip_data(irq, d->host_data);
563 irq_set_noprobe(irq);
564 return 0;
565 }
566
567 static const struct irq_domain_ops pxa_irq_domain_ops = {
568 .map = pxa_irq_domain_map,
569 .xlate = irq_domain_xlate_twocell,
570 };
571
572 #ifdef CONFIG_OF
573 static const struct of_device_id pxa_gpio_dt_ids[] = {
574 { .compatible = "intel,pxa25x-gpio", .data = &pxa25x_id, },
575 { .compatible = "intel,pxa26x-gpio", .data = &pxa26x_id, },
576 { .compatible = "intel,pxa27x-gpio", .data = &pxa27x_id, },
577 { .compatible = "intel,pxa3xx-gpio", .data = &pxa3xx_id, },
578 { .compatible = "marvell,pxa93x-gpio", .data = &pxa93x_id, },
579 { .compatible = "marvell,mmp-gpio", .data = &mmp_id, },
580 { .compatible = "marvell,mmp2-gpio", .data = &mmp2_id, },
581 { .compatible = "marvell,pxa1928-gpio", .data = &pxa1928_id, },
582 {}
583 };
584
pxa_gpio_probe_dt(struct platform_device * pdev,struct pxa_gpio_chip * pchip)585 static int pxa_gpio_probe_dt(struct platform_device *pdev,
586 struct pxa_gpio_chip *pchip)
587 {
588 int nr_gpios;
589 const struct pxa_gpio_id *gpio_id;
590
591 gpio_id = of_device_get_match_data(&pdev->dev);
592 gpio_type = gpio_id->type;
593
594 nr_gpios = gpio_id->gpio_nums;
595 pxa_last_gpio = nr_gpios - 1;
596
597 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, nr_gpios, 0);
598 if (irq_base < 0) {
599 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
600 return irq_base;
601 }
602 return irq_base;
603 }
604 #else
605 #define pxa_gpio_probe_dt(pdev, pchip) (-1)
606 #endif
607
pxa_gpio_probe(struct platform_device * pdev)608 static int pxa_gpio_probe(struct platform_device *pdev)
609 {
610 struct pxa_gpio_chip *pchip;
611 struct pxa_gpio_bank *c;
612 struct clk *clk;
613 struct pxa_gpio_platform_data *info;
614 void __iomem *gpio_reg_base;
615 int gpio, ret;
616 int irq0 = 0, irq1 = 0, irq_mux;
617
618 pchip = devm_kzalloc(&pdev->dev, sizeof(*pchip), GFP_KERNEL);
619 if (!pchip)
620 return -ENOMEM;
621 pchip->dev = &pdev->dev;
622
623 info = dev_get_platdata(&pdev->dev);
624 if (info) {
625 irq_base = info->irq_base;
626 if (irq_base <= 0)
627 return -EINVAL;
628 pxa_last_gpio = pxa_gpio_nums(pdev);
629 pchip->set_wake = info->gpio_set_wake;
630 } else {
631 irq_base = pxa_gpio_probe_dt(pdev, pchip);
632 if (irq_base < 0)
633 return -EINVAL;
634 }
635
636 if (!pxa_last_gpio)
637 return -EINVAL;
638
639 pchip->irqdomain = irq_domain_add_legacy(pdev->dev.of_node,
640 pxa_last_gpio + 1, irq_base,
641 0, &pxa_irq_domain_ops, pchip);
642 if (!pchip->irqdomain)
643 return -ENOMEM;
644
645 irq0 = platform_get_irq_byname_optional(pdev, "gpio0");
646 irq1 = platform_get_irq_byname_optional(pdev, "gpio1");
647 irq_mux = platform_get_irq_byname(pdev, "gpio_mux");
648 if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0)
649 || (irq_mux <= 0))
650 return -EINVAL;
651
652 pchip->irq0 = irq0;
653 pchip->irq1 = irq1;
654
655 gpio_reg_base = devm_platform_ioremap_resource(pdev, 0);
656 if (IS_ERR(gpio_reg_base))
657 return PTR_ERR(gpio_reg_base);
658
659 clk = devm_clk_get_enabled(&pdev->dev, NULL);
660 if (IS_ERR(clk)) {
661 dev_err(&pdev->dev, "Error %ld to get gpio clock\n",
662 PTR_ERR(clk));
663 return PTR_ERR(clk);
664 }
665
666 /* Initialize GPIO chips */
667 ret = pxa_init_gpio_chip(pchip, pxa_last_gpio + 1, gpio_reg_base);
668 if (ret)
669 return ret;
670
671 /* clear all GPIO edge detects */
672 for_each_gpio_bank(gpio, c, pchip) {
673 writel_relaxed(0, c->regbase + GFER_OFFSET);
674 writel_relaxed(0, c->regbase + GRER_OFFSET);
675 writel_relaxed(~0, c->regbase + GEDR_OFFSET);
676 /* unmask GPIO edge detect for AP side */
677 if (gpio_is_mmp_type(gpio_type))
678 writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);
679 }
680
681 if (irq0 > 0) {
682 ret = devm_request_irq(&pdev->dev,
683 irq0, pxa_gpio_direct_handler, 0,
684 "gpio-0", pchip);
685 if (ret)
686 dev_err(&pdev->dev, "request of gpio0 irq failed: %d\n",
687 ret);
688 }
689 if (irq1 > 0) {
690 ret = devm_request_irq(&pdev->dev,
691 irq1, pxa_gpio_direct_handler, 0,
692 "gpio-1", pchip);
693 if (ret)
694 dev_err(&pdev->dev, "request of gpio1 irq failed: %d\n",
695 ret);
696 }
697 ret = devm_request_irq(&pdev->dev,
698 irq_mux, pxa_gpio_demux_handler, 0,
699 "gpio-mux", pchip);
700 if (ret)
701 dev_err(&pdev->dev, "request of gpio-mux irq failed: %d\n",
702 ret);
703
704 pxa_gpio_chip = pchip;
705
706 return 0;
707 }
708
709 static const struct platform_device_id gpio_id_table[] = {
710 { "pxa25x-gpio", (unsigned long)&pxa25x_id },
711 { "pxa26x-gpio", (unsigned long)&pxa26x_id },
712 { "pxa27x-gpio", (unsigned long)&pxa27x_id },
713 { "pxa3xx-gpio", (unsigned long)&pxa3xx_id },
714 { "pxa93x-gpio", (unsigned long)&pxa93x_id },
715 { "mmp-gpio", (unsigned long)&mmp_id },
716 { "mmp2-gpio", (unsigned long)&mmp2_id },
717 { "pxa1928-gpio", (unsigned long)&pxa1928_id },
718 { },
719 };
720
721 static struct platform_driver pxa_gpio_driver = {
722 .probe = pxa_gpio_probe,
723 .driver = {
724 .name = "pxa-gpio",
725 .of_match_table = of_match_ptr(pxa_gpio_dt_ids),
726 },
727 .id_table = gpio_id_table,
728 };
729
pxa_gpio_legacy_init(void)730 static int __init pxa_gpio_legacy_init(void)
731 {
732 if (of_have_populated_dt())
733 return 0;
734
735 return platform_driver_register(&pxa_gpio_driver);
736 }
737 postcore_initcall(pxa_gpio_legacy_init);
738
pxa_gpio_dt_init(void)739 static int __init pxa_gpio_dt_init(void)
740 {
741 if (of_have_populated_dt())
742 return platform_driver_register(&pxa_gpio_driver);
743
744 return 0;
745 }
746 device_initcall(pxa_gpio_dt_init);
747
748 #ifdef CONFIG_PM
pxa_gpio_suspend(void)749 static int pxa_gpio_suspend(void)
750 {
751 struct pxa_gpio_chip *pchip = pxa_gpio_chip;
752 struct pxa_gpio_bank *c;
753 int gpio;
754
755 if (!pchip)
756 return 0;
757
758 for_each_gpio_bank(gpio, c, pchip) {
759 c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);
760 c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
761 c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);
762 c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);
763
764 /* Clear GPIO transition detect bits */
765 writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);
766 }
767 return 0;
768 }
769
pxa_gpio_resume(void)770 static void pxa_gpio_resume(void)
771 {
772 struct pxa_gpio_chip *pchip = pxa_gpio_chip;
773 struct pxa_gpio_bank *c;
774 int gpio;
775
776 if (!pchip)
777 return;
778
779 for_each_gpio_bank(gpio, c, pchip) {
780 /* restore level with set/clear */
781 writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET);
782 writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);
783
784 writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);
785 writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);
786 writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);
787 }
788 }
789 #else
790 #define pxa_gpio_suspend NULL
791 #define pxa_gpio_resume NULL
792 #endif
793
794 static struct syscore_ops pxa_gpio_syscore_ops = {
795 .suspend = pxa_gpio_suspend,
796 .resume = pxa_gpio_resume,
797 };
798
pxa_gpio_sysinit(void)799 static int __init pxa_gpio_sysinit(void)
800 {
801 register_syscore_ops(&pxa_gpio_syscore_ops);
802 return 0;
803 }
804 postcore_initcall(pxa_gpio_sysinit);
805