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Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux
[mirror_ubuntu-artful-kernel.git] / drivers / gpio / gpio-omap.c
1 /*
2 * Support functions for OMAP GPIO
3 *
4 * Copyright (C) 2003-2005 Nokia Corporation
5 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
6 *
7 * Copyright (C) 2009 Texas Instruments
8 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
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
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/syscore_ops.h>
19 #include <linux/err.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22 #include <linux/device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/pm.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/irqdomain.h>
28 #include <linux/irqchip/chained_irq.h>
29 #include <linux/gpio.h>
30 #include <linux/platform_data/gpio-omap.h>
31
32 #define OFF_MODE 1
33
34 static LIST_HEAD(omap_gpio_list);
35
36 struct gpio_regs {
37 u32 irqenable1;
38 u32 irqenable2;
39 u32 wake_en;
40 u32 ctrl;
41 u32 oe;
42 u32 leveldetect0;
43 u32 leveldetect1;
44 u32 risingdetect;
45 u32 fallingdetect;
46 u32 dataout;
47 u32 debounce;
48 u32 debounce_en;
49 };
50
51 struct gpio_bank {
52 struct list_head node;
53 void __iomem *base;
54 u16 irq;
55 struct irq_domain *domain;
56 u32 non_wakeup_gpios;
57 u32 enabled_non_wakeup_gpios;
58 struct gpio_regs context;
59 u32 saved_datain;
60 u32 level_mask;
61 u32 toggle_mask;
62 spinlock_t lock;
63 struct gpio_chip chip;
64 struct clk *dbck;
65 u32 mod_usage;
66 u32 dbck_enable_mask;
67 bool dbck_enabled;
68 struct device *dev;
69 bool is_mpuio;
70 bool dbck_flag;
71 bool loses_context;
72 int stride;
73 u32 width;
74 int context_loss_count;
75 int power_mode;
76 bool workaround_enabled;
77
78 void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
79 int (*get_context_loss_count)(struct device *dev);
80
81 struct omap_gpio_reg_offs *regs;
82 };
83
84 #define GPIO_INDEX(bank, gpio) (gpio % bank->width)
85 #define GPIO_BIT(bank, gpio) (1 << GPIO_INDEX(bank, gpio))
86 #define GPIO_MOD_CTRL_BIT BIT(0)
87
88 static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
89 {
90 return bank->chip.base + gpio_irq;
91 }
92
93 static int omap_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
94 {
95 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
96
97 return irq_find_mapping(bank->domain, offset);
98 }
99
100 static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
101 {
102 void __iomem *reg = bank->base;
103 u32 l;
104
105 reg += bank->regs->direction;
106 l = __raw_readl(reg);
107 if (is_input)
108 l |= 1 << gpio;
109 else
110 l &= ~(1 << gpio);
111 __raw_writel(l, reg);
112 bank->context.oe = l;
113 }
114
115
116 /* set data out value using dedicate set/clear register */
117 static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable)
118 {
119 void __iomem *reg = bank->base;
120 u32 l = GPIO_BIT(bank, gpio);
121
122 if (enable) {
123 reg += bank->regs->set_dataout;
124 bank->context.dataout |= l;
125 } else {
126 reg += bank->regs->clr_dataout;
127 bank->context.dataout &= ~l;
128 }
129
130 __raw_writel(l, reg);
131 }
132
133 /* set data out value using mask register */
134 static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable)
135 {
136 void __iomem *reg = bank->base + bank->regs->dataout;
137 u32 gpio_bit = GPIO_BIT(bank, gpio);
138 u32 l;
139
140 l = __raw_readl(reg);
141 if (enable)
142 l |= gpio_bit;
143 else
144 l &= ~gpio_bit;
145 __raw_writel(l, reg);
146 bank->context.dataout = l;
147 }
148
149 static int _get_gpio_datain(struct gpio_bank *bank, int offset)
150 {
151 void __iomem *reg = bank->base + bank->regs->datain;
152
153 return (__raw_readl(reg) & (1 << offset)) != 0;
154 }
155
156 static int _get_gpio_dataout(struct gpio_bank *bank, int offset)
157 {
158 void __iomem *reg = bank->base + bank->regs->dataout;
159
160 return (__raw_readl(reg) & (1 << offset)) != 0;
161 }
162
163 static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
164 {
165 int l = __raw_readl(base + reg);
166
167 if (set)
168 l |= mask;
169 else
170 l &= ~mask;
171
172 __raw_writel(l, base + reg);
173 }
174
175 static inline void _gpio_dbck_enable(struct gpio_bank *bank)
176 {
177 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
178 clk_enable(bank->dbck);
179 bank->dbck_enabled = true;
180
181 __raw_writel(bank->dbck_enable_mask,
182 bank->base + bank->regs->debounce_en);
183 }
184 }
185
186 static inline void _gpio_dbck_disable(struct gpio_bank *bank)
187 {
188 if (bank->dbck_enable_mask && bank->dbck_enabled) {
189 /*
190 * Disable debounce before cutting it's clock. If debounce is
191 * enabled but the clock is not, GPIO module seems to be unable
192 * to detect events and generate interrupts at least on OMAP3.
193 */
194 __raw_writel(0, bank->base + bank->regs->debounce_en);
195
196 clk_disable(bank->dbck);
197 bank->dbck_enabled = false;
198 }
199 }
200
201 /**
202 * _set_gpio_debounce - low level gpio debounce time
203 * @bank: the gpio bank we're acting upon
204 * @gpio: the gpio number on this @gpio
205 * @debounce: debounce time to use
206 *
207 * OMAP's debounce time is in 31us steps so we need
208 * to convert and round up to the closest unit.
209 */
210 static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
211 unsigned debounce)
212 {
213 void __iomem *reg;
214 u32 val;
215 u32 l;
216
217 if (!bank->dbck_flag)
218 return;
219
220 if (debounce < 32)
221 debounce = 0x01;
222 else if (debounce > 7936)
223 debounce = 0xff;
224 else
225 debounce = (debounce / 0x1f) - 1;
226
227 l = GPIO_BIT(bank, gpio);
228
229 clk_enable(bank->dbck);
230 reg = bank->base + bank->regs->debounce;
231 __raw_writel(debounce, reg);
232
233 reg = bank->base + bank->regs->debounce_en;
234 val = __raw_readl(reg);
235
236 if (debounce)
237 val |= l;
238 else
239 val &= ~l;
240 bank->dbck_enable_mask = val;
241
242 __raw_writel(val, reg);
243 clk_disable(bank->dbck);
244 /*
245 * Enable debounce clock per module.
246 * This call is mandatory because in omap_gpio_request() when
247 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
248 * runtime callbck fails to turn on dbck because dbck_enable_mask
249 * used within _gpio_dbck_enable() is still not initialized at
250 * that point. Therefore we have to enable dbck here.
251 */
252 _gpio_dbck_enable(bank);
253 if (bank->dbck_enable_mask) {
254 bank->context.debounce = debounce;
255 bank->context.debounce_en = val;
256 }
257 }
258
259 /**
260 * _clear_gpio_debounce - clear debounce settings for a gpio
261 * @bank: the gpio bank we're acting upon
262 * @gpio: the gpio number on this @gpio
263 *
264 * If a gpio is using debounce, then clear the debounce enable bit and if
265 * this is the only gpio in this bank using debounce, then clear the debounce
266 * time too. The debounce clock will also be disabled when calling this function
267 * if this is the only gpio in the bank using debounce.
268 */
269 static void _clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
270 {
271 u32 gpio_bit = GPIO_BIT(bank, gpio);
272
273 if (!bank->dbck_flag)
274 return;
275
276 if (!(bank->dbck_enable_mask & gpio_bit))
277 return;
278
279 bank->dbck_enable_mask &= ~gpio_bit;
280 bank->context.debounce_en &= ~gpio_bit;
281 __raw_writel(bank->context.debounce_en,
282 bank->base + bank->regs->debounce_en);
283
284 if (!bank->dbck_enable_mask) {
285 bank->context.debounce = 0;
286 __raw_writel(bank->context.debounce, bank->base +
287 bank->regs->debounce);
288 clk_disable(bank->dbck);
289 bank->dbck_enabled = false;
290 }
291 }
292
293 static inline void set_gpio_trigger(struct gpio_bank *bank, int gpio,
294 unsigned trigger)
295 {
296 void __iomem *base = bank->base;
297 u32 gpio_bit = 1 << gpio;
298
299 _gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
300 trigger & IRQ_TYPE_LEVEL_LOW);
301 _gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
302 trigger & IRQ_TYPE_LEVEL_HIGH);
303 _gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
304 trigger & IRQ_TYPE_EDGE_RISING);
305 _gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
306 trigger & IRQ_TYPE_EDGE_FALLING);
307
308 bank->context.leveldetect0 =
309 __raw_readl(bank->base + bank->regs->leveldetect0);
310 bank->context.leveldetect1 =
311 __raw_readl(bank->base + bank->regs->leveldetect1);
312 bank->context.risingdetect =
313 __raw_readl(bank->base + bank->regs->risingdetect);
314 bank->context.fallingdetect =
315 __raw_readl(bank->base + bank->regs->fallingdetect);
316
317 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
318 _gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
319 bank->context.wake_en =
320 __raw_readl(bank->base + bank->regs->wkup_en);
321 }
322
323 /* This part needs to be executed always for OMAP{34xx, 44xx} */
324 if (!bank->regs->irqctrl) {
325 /* On omap24xx proceed only when valid GPIO bit is set */
326 if (bank->non_wakeup_gpios) {
327 if (!(bank->non_wakeup_gpios & gpio_bit))
328 goto exit;
329 }
330
331 /*
332 * Log the edge gpio and manually trigger the IRQ
333 * after resume if the input level changes
334 * to avoid irq lost during PER RET/OFF mode
335 * Applies for omap2 non-wakeup gpio and all omap3 gpios
336 */
337 if (trigger & IRQ_TYPE_EDGE_BOTH)
338 bank->enabled_non_wakeup_gpios |= gpio_bit;
339 else
340 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
341 }
342
343 exit:
344 bank->level_mask =
345 __raw_readl(bank->base + bank->regs->leveldetect0) |
346 __raw_readl(bank->base + bank->regs->leveldetect1);
347 }
348
349 #ifdef CONFIG_ARCH_OMAP1
350 /*
351 * This only applies to chips that can't do both rising and falling edge
352 * detection at once. For all other chips, this function is a noop.
353 */
354 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
355 {
356 void __iomem *reg = bank->base;
357 u32 l = 0;
358
359 if (!bank->regs->irqctrl)
360 return;
361
362 reg += bank->regs->irqctrl;
363
364 l = __raw_readl(reg);
365 if ((l >> gpio) & 1)
366 l &= ~(1 << gpio);
367 else
368 l |= 1 << gpio;
369
370 __raw_writel(l, reg);
371 }
372 #else
373 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
374 #endif
375
376 static int _set_gpio_triggering(struct gpio_bank *bank, int gpio,
377 unsigned trigger)
378 {
379 void __iomem *reg = bank->base;
380 void __iomem *base = bank->base;
381 u32 l = 0;
382
383 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
384 set_gpio_trigger(bank, gpio, trigger);
385 } else if (bank->regs->irqctrl) {
386 reg += bank->regs->irqctrl;
387
388 l = __raw_readl(reg);
389 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
390 bank->toggle_mask |= 1 << gpio;
391 if (trigger & IRQ_TYPE_EDGE_RISING)
392 l |= 1 << gpio;
393 else if (trigger & IRQ_TYPE_EDGE_FALLING)
394 l &= ~(1 << gpio);
395 else
396 return -EINVAL;
397
398 __raw_writel(l, reg);
399 } else if (bank->regs->edgectrl1) {
400 if (gpio & 0x08)
401 reg += bank->regs->edgectrl2;
402 else
403 reg += bank->regs->edgectrl1;
404
405 gpio &= 0x07;
406 l = __raw_readl(reg);
407 l &= ~(3 << (gpio << 1));
408 if (trigger & IRQ_TYPE_EDGE_RISING)
409 l |= 2 << (gpio << 1);
410 if (trigger & IRQ_TYPE_EDGE_FALLING)
411 l |= 1 << (gpio << 1);
412
413 /* Enable wake-up during idle for dynamic tick */
414 _gpio_rmw(base, bank->regs->wkup_en, 1 << gpio, trigger);
415 bank->context.wake_en =
416 __raw_readl(bank->base + bank->regs->wkup_en);
417 __raw_writel(l, reg);
418 }
419 return 0;
420 }
421
422 static int gpio_irq_type(struct irq_data *d, unsigned type)
423 {
424 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
425 unsigned gpio = 0;
426 int retval;
427 unsigned long flags;
428
429 if (WARN_ON(!bank->mod_usage))
430 return -EINVAL;
431
432 #ifdef CONFIG_ARCH_OMAP1
433 if (d->irq > IH_MPUIO_BASE)
434 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
435 #endif
436
437 if (!gpio)
438 gpio = irq_to_gpio(bank, d->hwirq);
439
440 if (type & ~IRQ_TYPE_SENSE_MASK)
441 return -EINVAL;
442
443 if (!bank->regs->leveldetect0 &&
444 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
445 return -EINVAL;
446
447 spin_lock_irqsave(&bank->lock, flags);
448 retval = _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), type);
449 spin_unlock_irqrestore(&bank->lock, flags);
450
451 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
452 __irq_set_handler_locked(d->irq, handle_level_irq);
453 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
454 __irq_set_handler_locked(d->irq, handle_edge_irq);
455
456 return retval;
457 }
458
459 static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
460 {
461 void __iomem *reg = bank->base;
462
463 reg += bank->regs->irqstatus;
464 __raw_writel(gpio_mask, reg);
465
466 /* Workaround for clearing DSP GPIO interrupts to allow retention */
467 if (bank->regs->irqstatus2) {
468 reg = bank->base + bank->regs->irqstatus2;
469 __raw_writel(gpio_mask, reg);
470 }
471
472 /* Flush posted write for the irq status to avoid spurious interrupts */
473 __raw_readl(reg);
474 }
475
476 static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
477 {
478 _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
479 }
480
481 static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
482 {
483 void __iomem *reg = bank->base;
484 u32 l;
485 u32 mask = (1 << bank->width) - 1;
486
487 reg += bank->regs->irqenable;
488 l = __raw_readl(reg);
489 if (bank->regs->irqenable_inv)
490 l = ~l;
491 l &= mask;
492 return l;
493 }
494
495 static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
496 {
497 void __iomem *reg = bank->base;
498 u32 l;
499
500 if (bank->regs->set_irqenable) {
501 reg += bank->regs->set_irqenable;
502 l = gpio_mask;
503 bank->context.irqenable1 |= gpio_mask;
504 } else {
505 reg += bank->regs->irqenable;
506 l = __raw_readl(reg);
507 if (bank->regs->irqenable_inv)
508 l &= ~gpio_mask;
509 else
510 l |= gpio_mask;
511 bank->context.irqenable1 = l;
512 }
513
514 __raw_writel(l, reg);
515 }
516
517 static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
518 {
519 void __iomem *reg = bank->base;
520 u32 l;
521
522 if (bank->regs->clr_irqenable) {
523 reg += bank->regs->clr_irqenable;
524 l = gpio_mask;
525 bank->context.irqenable1 &= ~gpio_mask;
526 } else {
527 reg += bank->regs->irqenable;
528 l = __raw_readl(reg);
529 if (bank->regs->irqenable_inv)
530 l |= gpio_mask;
531 else
532 l &= ~gpio_mask;
533 bank->context.irqenable1 = l;
534 }
535
536 __raw_writel(l, reg);
537 }
538
539 static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
540 {
541 if (enable)
542 _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
543 else
544 _disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
545 }
546
547 /*
548 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
549 * 1510 does not seem to have a wake-up register. If JTAG is connected
550 * to the target, system will wake up always on GPIO events. While
551 * system is running all registered GPIO interrupts need to have wake-up
552 * enabled. When system is suspended, only selected GPIO interrupts need
553 * to have wake-up enabled.
554 */
555 static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
556 {
557 u32 gpio_bit = GPIO_BIT(bank, gpio);
558 unsigned long flags;
559
560 if (bank->non_wakeup_gpios & gpio_bit) {
561 dev_err(bank->dev,
562 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
563 return -EINVAL;
564 }
565
566 spin_lock_irqsave(&bank->lock, flags);
567 if (enable)
568 bank->context.wake_en |= gpio_bit;
569 else
570 bank->context.wake_en &= ~gpio_bit;
571
572 __raw_writel(bank->context.wake_en, bank->base + bank->regs->wkup_en);
573 spin_unlock_irqrestore(&bank->lock, flags);
574
575 return 0;
576 }
577
578 static void _reset_gpio(struct gpio_bank *bank, int gpio)
579 {
580 _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
581 _set_gpio_irqenable(bank, gpio, 0);
582 _clear_gpio_irqstatus(bank, gpio);
583 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
584 _clear_gpio_debounce(bank, gpio);
585 }
586
587 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
588 static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
589 {
590 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
591 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
592
593 return _set_gpio_wakeup(bank, gpio, enable);
594 }
595
596 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
597 {
598 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
599 unsigned long flags;
600
601 /*
602 * If this is the first gpio_request for the bank,
603 * enable the bank module.
604 */
605 if (!bank->mod_usage)
606 pm_runtime_get_sync(bank->dev);
607
608 spin_lock_irqsave(&bank->lock, flags);
609 /* Set trigger to none. You need to enable the desired trigger with
610 * request_irq() or set_irq_type().
611 */
612 _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
613
614 if (bank->regs->pinctrl) {
615 void __iomem *reg = bank->base + bank->regs->pinctrl;
616
617 /* Claim the pin for MPU */
618 __raw_writel(__raw_readl(reg) | (1 << offset), reg);
619 }
620
621 if (bank->regs->ctrl && !bank->mod_usage) {
622 void __iomem *reg = bank->base + bank->regs->ctrl;
623 u32 ctrl;
624
625 ctrl = __raw_readl(reg);
626 /* Module is enabled, clocks are not gated */
627 ctrl &= ~GPIO_MOD_CTRL_BIT;
628 __raw_writel(ctrl, reg);
629 bank->context.ctrl = ctrl;
630 }
631
632 bank->mod_usage |= 1 << offset;
633
634 spin_unlock_irqrestore(&bank->lock, flags);
635
636 return 0;
637 }
638
639 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
640 {
641 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
642 void __iomem *base = bank->base;
643 unsigned long flags;
644
645 spin_lock_irqsave(&bank->lock, flags);
646
647 if (bank->regs->wkup_en) {
648 /* Disable wake-up during idle for dynamic tick */
649 _gpio_rmw(base, bank->regs->wkup_en, 1 << offset, 0);
650 bank->context.wake_en =
651 __raw_readl(bank->base + bank->regs->wkup_en);
652 }
653
654 bank->mod_usage &= ~(1 << offset);
655
656 if (bank->regs->ctrl && !bank->mod_usage) {
657 void __iomem *reg = bank->base + bank->regs->ctrl;
658 u32 ctrl;
659
660 ctrl = __raw_readl(reg);
661 /* Module is disabled, clocks are gated */
662 ctrl |= GPIO_MOD_CTRL_BIT;
663 __raw_writel(ctrl, reg);
664 bank->context.ctrl = ctrl;
665 }
666
667 _reset_gpio(bank, bank->chip.base + offset);
668 spin_unlock_irqrestore(&bank->lock, flags);
669
670 /*
671 * If this is the last gpio to be freed in the bank,
672 * disable the bank module.
673 */
674 if (!bank->mod_usage)
675 pm_runtime_put(bank->dev);
676 }
677
678 /*
679 * We need to unmask the GPIO bank interrupt as soon as possible to
680 * avoid missing GPIO interrupts for other lines in the bank.
681 * Then we need to mask-read-clear-unmask the triggered GPIO lines
682 * in the bank to avoid missing nested interrupts for a GPIO line.
683 * If we wait to unmask individual GPIO lines in the bank after the
684 * line's interrupt handler has been run, we may miss some nested
685 * interrupts.
686 */
687 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
688 {
689 void __iomem *isr_reg = NULL;
690 u32 isr;
691 unsigned int bit;
692 struct gpio_bank *bank;
693 int unmasked = 0;
694 struct irq_chip *chip = irq_desc_get_chip(desc);
695
696 chained_irq_enter(chip, desc);
697
698 bank = irq_get_handler_data(irq);
699 isr_reg = bank->base + bank->regs->irqstatus;
700 pm_runtime_get_sync(bank->dev);
701
702 if (WARN_ON(!isr_reg))
703 goto exit;
704
705 while (1) {
706 u32 isr_saved, level_mask = 0;
707 u32 enabled;
708
709 enabled = _get_gpio_irqbank_mask(bank);
710 isr_saved = isr = __raw_readl(isr_reg) & enabled;
711
712 if (bank->level_mask)
713 level_mask = bank->level_mask & enabled;
714
715 /* clear edge sensitive interrupts before handler(s) are
716 called so that we don't miss any interrupt occurred while
717 executing them */
718 _disable_gpio_irqbank(bank, isr_saved & ~level_mask);
719 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
720 _enable_gpio_irqbank(bank, isr_saved & ~level_mask);
721
722 /* if there is only edge sensitive GPIO pin interrupts
723 configured, we could unmask GPIO bank interrupt immediately */
724 if (!level_mask && !unmasked) {
725 unmasked = 1;
726 chained_irq_exit(chip, desc);
727 }
728
729 if (!isr)
730 break;
731
732 while (isr) {
733 bit = __ffs(isr);
734 isr &= ~(1 << bit);
735
736 /*
737 * Some chips can't respond to both rising and falling
738 * at the same time. If this irq was requested with
739 * both flags, we need to flip the ICR data for the IRQ
740 * to respond to the IRQ for the opposite direction.
741 * This will be indicated in the bank toggle_mask.
742 */
743 if (bank->toggle_mask & (1 << bit))
744 _toggle_gpio_edge_triggering(bank, bit);
745
746 generic_handle_irq(irq_find_mapping(bank->domain, bit));
747 }
748 }
749 /* if bank has any level sensitive GPIO pin interrupt
750 configured, we must unmask the bank interrupt only after
751 handler(s) are executed in order to avoid spurious bank
752 interrupt */
753 exit:
754 if (!unmasked)
755 chained_irq_exit(chip, desc);
756 pm_runtime_put(bank->dev);
757 }
758
759 static void gpio_irq_shutdown(struct irq_data *d)
760 {
761 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
762 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
763 unsigned long flags;
764
765 spin_lock_irqsave(&bank->lock, flags);
766 _reset_gpio(bank, gpio);
767 spin_unlock_irqrestore(&bank->lock, flags);
768 }
769
770 static void gpio_ack_irq(struct irq_data *d)
771 {
772 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
773 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
774
775 _clear_gpio_irqstatus(bank, gpio);
776 }
777
778 static void gpio_mask_irq(struct irq_data *d)
779 {
780 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
781 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
782 unsigned long flags;
783
784 spin_lock_irqsave(&bank->lock, flags);
785 _set_gpio_irqenable(bank, gpio, 0);
786 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
787 spin_unlock_irqrestore(&bank->lock, flags);
788 }
789
790 static void gpio_unmask_irq(struct irq_data *d)
791 {
792 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
793 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
794 unsigned int irq_mask = GPIO_BIT(bank, gpio);
795 u32 trigger = irqd_get_trigger_type(d);
796 unsigned long flags;
797
798 spin_lock_irqsave(&bank->lock, flags);
799 if (trigger)
800 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
801
802 /* For level-triggered GPIOs, the clearing must be done after
803 * the HW source is cleared, thus after the handler has run */
804 if (bank->level_mask & irq_mask) {
805 _set_gpio_irqenable(bank, gpio, 0);
806 _clear_gpio_irqstatus(bank, gpio);
807 }
808
809 _set_gpio_irqenable(bank, gpio, 1);
810 spin_unlock_irqrestore(&bank->lock, flags);
811 }
812
813 static struct irq_chip gpio_irq_chip = {
814 .name = "GPIO",
815 .irq_shutdown = gpio_irq_shutdown,
816 .irq_ack = gpio_ack_irq,
817 .irq_mask = gpio_mask_irq,
818 .irq_unmask = gpio_unmask_irq,
819 .irq_set_type = gpio_irq_type,
820 .irq_set_wake = gpio_wake_enable,
821 };
822
823 /*---------------------------------------------------------------------*/
824
825 static int omap_mpuio_suspend_noirq(struct device *dev)
826 {
827 struct platform_device *pdev = to_platform_device(dev);
828 struct gpio_bank *bank = platform_get_drvdata(pdev);
829 void __iomem *mask_reg = bank->base +
830 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
831 unsigned long flags;
832
833 spin_lock_irqsave(&bank->lock, flags);
834 __raw_writel(0xffff & ~bank->context.wake_en, mask_reg);
835 spin_unlock_irqrestore(&bank->lock, flags);
836
837 return 0;
838 }
839
840 static int omap_mpuio_resume_noirq(struct device *dev)
841 {
842 struct platform_device *pdev = to_platform_device(dev);
843 struct gpio_bank *bank = platform_get_drvdata(pdev);
844 void __iomem *mask_reg = bank->base +
845 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
846 unsigned long flags;
847
848 spin_lock_irqsave(&bank->lock, flags);
849 __raw_writel(bank->context.wake_en, mask_reg);
850 spin_unlock_irqrestore(&bank->lock, flags);
851
852 return 0;
853 }
854
855 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
856 .suspend_noirq = omap_mpuio_suspend_noirq,
857 .resume_noirq = omap_mpuio_resume_noirq,
858 };
859
860 /* use platform_driver for this. */
861 static struct platform_driver omap_mpuio_driver = {
862 .driver = {
863 .name = "mpuio",
864 .pm = &omap_mpuio_dev_pm_ops,
865 },
866 };
867
868 static struct platform_device omap_mpuio_device = {
869 .name = "mpuio",
870 .id = -1,
871 .dev = {
872 .driver = &omap_mpuio_driver.driver,
873 }
874 /* could list the /proc/iomem resources */
875 };
876
877 static inline void mpuio_init(struct gpio_bank *bank)
878 {
879 platform_set_drvdata(&omap_mpuio_device, bank);
880
881 if (platform_driver_register(&omap_mpuio_driver) == 0)
882 (void) platform_device_register(&omap_mpuio_device);
883 }
884
885 /*---------------------------------------------------------------------*/
886
887 static int gpio_input(struct gpio_chip *chip, unsigned offset)
888 {
889 struct gpio_bank *bank;
890 unsigned long flags;
891
892 bank = container_of(chip, struct gpio_bank, chip);
893 spin_lock_irqsave(&bank->lock, flags);
894 _set_gpio_direction(bank, offset, 1);
895 spin_unlock_irqrestore(&bank->lock, flags);
896 return 0;
897 }
898
899 static int gpio_is_input(struct gpio_bank *bank, int mask)
900 {
901 void __iomem *reg = bank->base + bank->regs->direction;
902
903 return __raw_readl(reg) & mask;
904 }
905
906 static int gpio_get(struct gpio_chip *chip, unsigned offset)
907 {
908 struct gpio_bank *bank;
909 u32 mask;
910
911 bank = container_of(chip, struct gpio_bank, chip);
912 mask = (1 << offset);
913
914 if (gpio_is_input(bank, mask))
915 return _get_gpio_datain(bank, offset);
916 else
917 return _get_gpio_dataout(bank, offset);
918 }
919
920 static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
921 {
922 struct gpio_bank *bank;
923 unsigned long flags;
924
925 bank = container_of(chip, struct gpio_bank, chip);
926 spin_lock_irqsave(&bank->lock, flags);
927 bank->set_dataout(bank, offset, value);
928 _set_gpio_direction(bank, offset, 0);
929 spin_unlock_irqrestore(&bank->lock, flags);
930 return 0;
931 }
932
933 static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
934 unsigned debounce)
935 {
936 struct gpio_bank *bank;
937 unsigned long flags;
938
939 bank = container_of(chip, struct gpio_bank, chip);
940
941 spin_lock_irqsave(&bank->lock, flags);
942 _set_gpio_debounce(bank, offset, debounce);
943 spin_unlock_irqrestore(&bank->lock, flags);
944
945 return 0;
946 }
947
948 static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
949 {
950 struct gpio_bank *bank;
951 unsigned long flags;
952
953 bank = container_of(chip, struct gpio_bank, chip);
954 spin_lock_irqsave(&bank->lock, flags);
955 bank->set_dataout(bank, offset, value);
956 spin_unlock_irqrestore(&bank->lock, flags);
957 }
958
959 /*---------------------------------------------------------------------*/
960
961 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
962 {
963 static bool called;
964 u32 rev;
965
966 if (called || bank->regs->revision == USHRT_MAX)
967 return;
968
969 rev = __raw_readw(bank->base + bank->regs->revision);
970 pr_info("OMAP GPIO hardware version %d.%d\n",
971 (rev >> 4) & 0x0f, rev & 0x0f);
972
973 called = true;
974 }
975
976 /* This lock class tells lockdep that GPIO irqs are in a different
977 * category than their parents, so it won't report false recursion.
978 */
979 static struct lock_class_key gpio_lock_class;
980
981 static void omap_gpio_mod_init(struct gpio_bank *bank)
982 {
983 void __iomem *base = bank->base;
984 u32 l = 0xffffffff;
985
986 if (bank->width == 16)
987 l = 0xffff;
988
989 if (bank->is_mpuio) {
990 __raw_writel(l, bank->base + bank->regs->irqenable);
991 return;
992 }
993
994 _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv);
995 _gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv);
996 if (bank->regs->debounce_en)
997 __raw_writel(0, base + bank->regs->debounce_en);
998
999 /* Save OE default value (0xffffffff) in the context */
1000 bank->context.oe = __raw_readl(bank->base + bank->regs->direction);
1001 /* Initialize interface clk ungated, module enabled */
1002 if (bank->regs->ctrl)
1003 __raw_writel(0, base + bank->regs->ctrl);
1004
1005 bank->dbck = clk_get(bank->dev, "dbclk");
1006 if (IS_ERR(bank->dbck))
1007 dev_err(bank->dev, "Could not get gpio dbck\n");
1008 }
1009
1010 static void
1011 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1012 unsigned int num)
1013 {
1014 struct irq_chip_generic *gc;
1015 struct irq_chip_type *ct;
1016
1017 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1018 handle_simple_irq);
1019 if (!gc) {
1020 dev_err(bank->dev, "Memory alloc failed for gc\n");
1021 return;
1022 }
1023
1024 ct = gc->chip_types;
1025
1026 /* NOTE: No ack required, reading IRQ status clears it. */
1027 ct->chip.irq_mask = irq_gc_mask_set_bit;
1028 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1029 ct->chip.irq_set_type = gpio_irq_type;
1030
1031 if (bank->regs->wkup_en)
1032 ct->chip.irq_set_wake = gpio_wake_enable,
1033
1034 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1035 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1036 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1037 }
1038
1039 static void omap_gpio_chip_init(struct gpio_bank *bank)
1040 {
1041 int j;
1042 static int gpio;
1043
1044 /*
1045 * REVISIT eventually switch from OMAP-specific gpio structs
1046 * over to the generic ones
1047 */
1048 bank->chip.request = omap_gpio_request;
1049 bank->chip.free = omap_gpio_free;
1050 bank->chip.direction_input = gpio_input;
1051 bank->chip.get = gpio_get;
1052 bank->chip.direction_output = gpio_output;
1053 bank->chip.set_debounce = gpio_debounce;
1054 bank->chip.set = gpio_set;
1055 bank->chip.to_irq = omap_gpio_to_irq;
1056 if (bank->is_mpuio) {
1057 bank->chip.label = "mpuio";
1058 if (bank->regs->wkup_en)
1059 bank->chip.dev = &omap_mpuio_device.dev;
1060 bank->chip.base = OMAP_MPUIO(0);
1061 } else {
1062 bank->chip.label = "gpio";
1063 bank->chip.base = gpio;
1064 gpio += bank->width;
1065 }
1066 bank->chip.ngpio = bank->width;
1067
1068 gpiochip_add(&bank->chip);
1069
1070 for (j = 0; j < bank->width; j++) {
1071 int irq = irq_create_mapping(bank->domain, j);
1072 irq_set_lockdep_class(irq, &gpio_lock_class);
1073 irq_set_chip_data(irq, bank);
1074 if (bank->is_mpuio) {
1075 omap_mpuio_alloc_gc(bank, irq, bank->width);
1076 } else {
1077 irq_set_chip_and_handler(irq, &gpio_irq_chip,
1078 handle_simple_irq);
1079 set_irq_flags(irq, IRQF_VALID);
1080 }
1081 }
1082 irq_set_chained_handler(bank->irq, gpio_irq_handler);
1083 irq_set_handler_data(bank->irq, bank);
1084 }
1085
1086 static const struct of_device_id omap_gpio_match[];
1087
1088 static int omap_gpio_probe(struct platform_device *pdev)
1089 {
1090 struct device *dev = &pdev->dev;
1091 struct device_node *node = dev->of_node;
1092 const struct of_device_id *match;
1093 const struct omap_gpio_platform_data *pdata;
1094 struct resource *res;
1095 struct gpio_bank *bank;
1096
1097 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1098
1099 pdata = match ? match->data : dev->platform_data;
1100 if (!pdata)
1101 return -EINVAL;
1102
1103 bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1104 if (!bank) {
1105 dev_err(dev, "Memory alloc failed\n");
1106 return -ENOMEM;
1107 }
1108
1109 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1110 if (unlikely(!res)) {
1111 dev_err(dev, "Invalid IRQ resource\n");
1112 return -ENODEV;
1113 }
1114
1115 bank->irq = res->start;
1116 bank->dev = dev;
1117 bank->dbck_flag = pdata->dbck_flag;
1118 bank->stride = pdata->bank_stride;
1119 bank->width = pdata->bank_width;
1120 bank->is_mpuio = pdata->is_mpuio;
1121 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1122 bank->regs = pdata->regs;
1123 #ifdef CONFIG_OF_GPIO
1124 bank->chip.of_node = of_node_get(node);
1125 #endif
1126 if (node) {
1127 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1128 bank->loses_context = true;
1129 } else {
1130 bank->loses_context = pdata->loses_context;
1131 }
1132
1133
1134 bank->domain = irq_domain_add_linear(node, bank->width,
1135 &irq_domain_simple_ops, NULL);
1136 if (!bank->domain)
1137 return -ENODEV;
1138
1139 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1140 bank->set_dataout = _set_gpio_dataout_reg;
1141 else
1142 bank->set_dataout = _set_gpio_dataout_mask;
1143
1144 spin_lock_init(&bank->lock);
1145
1146 /* Static mapping, never released */
1147 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1148 if (unlikely(!res)) {
1149 dev_err(dev, "Invalid mem resource\n");
1150 irq_domain_remove(bank->domain);
1151 return -ENODEV;
1152 }
1153
1154 if (!devm_request_mem_region(dev, res->start, resource_size(res),
1155 pdev->name)) {
1156 dev_err(dev, "Region already claimed\n");
1157 irq_domain_remove(bank->domain);
1158 return -EBUSY;
1159 }
1160
1161 bank->base = devm_ioremap(dev, res->start, resource_size(res));
1162 if (!bank->base) {
1163 dev_err(dev, "Could not ioremap\n");
1164 irq_domain_remove(bank->domain);
1165 return -ENOMEM;
1166 }
1167
1168 platform_set_drvdata(pdev, bank);
1169
1170 pm_runtime_enable(bank->dev);
1171 pm_runtime_irq_safe(bank->dev);
1172 pm_runtime_get_sync(bank->dev);
1173
1174 if (bank->is_mpuio)
1175 mpuio_init(bank);
1176
1177 omap_gpio_mod_init(bank);
1178 omap_gpio_chip_init(bank);
1179 omap_gpio_show_rev(bank);
1180
1181 if (bank->loses_context)
1182 bank->get_context_loss_count = pdata->get_context_loss_count;
1183
1184 pm_runtime_put(bank->dev);
1185
1186 list_add_tail(&bank->node, &omap_gpio_list);
1187
1188 return 0;
1189 }
1190
1191 #ifdef CONFIG_ARCH_OMAP2PLUS
1192
1193 #if defined(CONFIG_PM_RUNTIME)
1194 static void omap_gpio_restore_context(struct gpio_bank *bank);
1195
1196 static int omap_gpio_runtime_suspend(struct device *dev)
1197 {
1198 struct platform_device *pdev = to_platform_device(dev);
1199 struct gpio_bank *bank = platform_get_drvdata(pdev);
1200 u32 l1 = 0, l2 = 0;
1201 unsigned long flags;
1202 u32 wake_low, wake_hi;
1203
1204 spin_lock_irqsave(&bank->lock, flags);
1205
1206 /*
1207 * Only edges can generate a wakeup event to the PRCM.
1208 *
1209 * Therefore, ensure any wake-up capable GPIOs have
1210 * edge-detection enabled before going idle to ensure a wakeup
1211 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1212 * NDA TRM 25.5.3.1)
1213 *
1214 * The normal values will be restored upon ->runtime_resume()
1215 * by writing back the values saved in bank->context.
1216 */
1217 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1218 if (wake_low)
1219 __raw_writel(wake_low | bank->context.fallingdetect,
1220 bank->base + bank->regs->fallingdetect);
1221 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1222 if (wake_hi)
1223 __raw_writel(wake_hi | bank->context.risingdetect,
1224 bank->base + bank->regs->risingdetect);
1225
1226 if (!bank->enabled_non_wakeup_gpios)
1227 goto update_gpio_context_count;
1228
1229 if (bank->power_mode != OFF_MODE) {
1230 bank->power_mode = 0;
1231 goto update_gpio_context_count;
1232 }
1233 /*
1234 * If going to OFF, remove triggering for all
1235 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1236 * generated. See OMAP2420 Errata item 1.101.
1237 */
1238 bank->saved_datain = __raw_readl(bank->base +
1239 bank->regs->datain);
1240 l1 = bank->context.fallingdetect;
1241 l2 = bank->context.risingdetect;
1242
1243 l1 &= ~bank->enabled_non_wakeup_gpios;
1244 l2 &= ~bank->enabled_non_wakeup_gpios;
1245
1246 __raw_writel(l1, bank->base + bank->regs->fallingdetect);
1247 __raw_writel(l2, bank->base + bank->regs->risingdetect);
1248
1249 bank->workaround_enabled = true;
1250
1251 update_gpio_context_count:
1252 if (bank->get_context_loss_count)
1253 bank->context_loss_count =
1254 bank->get_context_loss_count(bank->dev);
1255
1256 _gpio_dbck_disable(bank);
1257 spin_unlock_irqrestore(&bank->lock, flags);
1258
1259 return 0;
1260 }
1261
1262 static int omap_gpio_runtime_resume(struct device *dev)
1263 {
1264 struct platform_device *pdev = to_platform_device(dev);
1265 struct gpio_bank *bank = platform_get_drvdata(pdev);
1266 u32 l = 0, gen, gen0, gen1;
1267 unsigned long flags;
1268 int c;
1269
1270 spin_lock_irqsave(&bank->lock, flags);
1271 _gpio_dbck_enable(bank);
1272
1273 /*
1274 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1275 * GPIOs were set to edge trigger also in order to be able to
1276 * generate a PRCM wakeup. Here we restore the
1277 * pre-runtime_suspend() values for edge triggering.
1278 */
1279 __raw_writel(bank->context.fallingdetect,
1280 bank->base + bank->regs->fallingdetect);
1281 __raw_writel(bank->context.risingdetect,
1282 bank->base + bank->regs->risingdetect);
1283
1284 if (bank->loses_context) {
1285 if (!bank->get_context_loss_count) {
1286 omap_gpio_restore_context(bank);
1287 } else {
1288 c = bank->get_context_loss_count(bank->dev);
1289 if (c != bank->context_loss_count) {
1290 omap_gpio_restore_context(bank);
1291 } else {
1292 spin_unlock_irqrestore(&bank->lock, flags);
1293 return 0;
1294 }
1295 }
1296 }
1297
1298 if (!bank->workaround_enabled) {
1299 spin_unlock_irqrestore(&bank->lock, flags);
1300 return 0;
1301 }
1302
1303 l = __raw_readl(bank->base + bank->regs->datain);
1304
1305 /*
1306 * Check if any of the non-wakeup interrupt GPIOs have changed
1307 * state. If so, generate an IRQ by software. This is
1308 * horribly racy, but it's the best we can do to work around
1309 * this silicon bug.
1310 */
1311 l ^= bank->saved_datain;
1312 l &= bank->enabled_non_wakeup_gpios;
1313
1314 /*
1315 * No need to generate IRQs for the rising edge for gpio IRQs
1316 * configured with falling edge only; and vice versa.
1317 */
1318 gen0 = l & bank->context.fallingdetect;
1319 gen0 &= bank->saved_datain;
1320
1321 gen1 = l & bank->context.risingdetect;
1322 gen1 &= ~(bank->saved_datain);
1323
1324 /* FIXME: Consider GPIO IRQs with level detections properly! */
1325 gen = l & (~(bank->context.fallingdetect) &
1326 ~(bank->context.risingdetect));
1327 /* Consider all GPIO IRQs needed to be updated */
1328 gen |= gen0 | gen1;
1329
1330 if (gen) {
1331 u32 old0, old1;
1332
1333 old0 = __raw_readl(bank->base + bank->regs->leveldetect0);
1334 old1 = __raw_readl(bank->base + bank->regs->leveldetect1);
1335
1336 if (!bank->regs->irqstatus_raw0) {
1337 __raw_writel(old0 | gen, bank->base +
1338 bank->regs->leveldetect0);
1339 __raw_writel(old1 | gen, bank->base +
1340 bank->regs->leveldetect1);
1341 }
1342
1343 if (bank->regs->irqstatus_raw0) {
1344 __raw_writel(old0 | l, bank->base +
1345 bank->regs->leveldetect0);
1346 __raw_writel(old1 | l, bank->base +
1347 bank->regs->leveldetect1);
1348 }
1349 __raw_writel(old0, bank->base + bank->regs->leveldetect0);
1350 __raw_writel(old1, bank->base + bank->regs->leveldetect1);
1351 }
1352
1353 bank->workaround_enabled = false;
1354 spin_unlock_irqrestore(&bank->lock, flags);
1355
1356 return 0;
1357 }
1358 #endif /* CONFIG_PM_RUNTIME */
1359
1360 void omap2_gpio_prepare_for_idle(int pwr_mode)
1361 {
1362 struct gpio_bank *bank;
1363
1364 list_for_each_entry(bank, &omap_gpio_list, node) {
1365 if (!bank->mod_usage || !bank->loses_context)
1366 continue;
1367
1368 bank->power_mode = pwr_mode;
1369
1370 pm_runtime_put_sync_suspend(bank->dev);
1371 }
1372 }
1373
1374 void omap2_gpio_resume_after_idle(void)
1375 {
1376 struct gpio_bank *bank;
1377
1378 list_for_each_entry(bank, &omap_gpio_list, node) {
1379 if (!bank->mod_usage || !bank->loses_context)
1380 continue;
1381
1382 pm_runtime_get_sync(bank->dev);
1383 }
1384 }
1385
1386 #if defined(CONFIG_PM_RUNTIME)
1387 static void omap_gpio_restore_context(struct gpio_bank *bank)
1388 {
1389 __raw_writel(bank->context.wake_en,
1390 bank->base + bank->regs->wkup_en);
1391 __raw_writel(bank->context.ctrl, bank->base + bank->regs->ctrl);
1392 __raw_writel(bank->context.leveldetect0,
1393 bank->base + bank->regs->leveldetect0);
1394 __raw_writel(bank->context.leveldetect1,
1395 bank->base + bank->regs->leveldetect1);
1396 __raw_writel(bank->context.risingdetect,
1397 bank->base + bank->regs->risingdetect);
1398 __raw_writel(bank->context.fallingdetect,
1399 bank->base + bank->regs->fallingdetect);
1400 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1401 __raw_writel(bank->context.dataout,
1402 bank->base + bank->regs->set_dataout);
1403 else
1404 __raw_writel(bank->context.dataout,
1405 bank->base + bank->regs->dataout);
1406 __raw_writel(bank->context.oe, bank->base + bank->regs->direction);
1407
1408 if (bank->dbck_enable_mask) {
1409 __raw_writel(bank->context.debounce, bank->base +
1410 bank->regs->debounce);
1411 __raw_writel(bank->context.debounce_en,
1412 bank->base + bank->regs->debounce_en);
1413 }
1414
1415 __raw_writel(bank->context.irqenable1,
1416 bank->base + bank->regs->irqenable);
1417 __raw_writel(bank->context.irqenable2,
1418 bank->base + bank->regs->irqenable2);
1419 }
1420 #endif /* CONFIG_PM_RUNTIME */
1421 #else
1422 #define omap_gpio_runtime_suspend NULL
1423 #define omap_gpio_runtime_resume NULL
1424 #endif
1425
1426 static const struct dev_pm_ops gpio_pm_ops = {
1427 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1428 NULL)
1429 };
1430
1431 #if defined(CONFIG_OF)
1432 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1433 .revision = OMAP24XX_GPIO_REVISION,
1434 .direction = OMAP24XX_GPIO_OE,
1435 .datain = OMAP24XX_GPIO_DATAIN,
1436 .dataout = OMAP24XX_GPIO_DATAOUT,
1437 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1438 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1439 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1440 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1441 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1442 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1443 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1444 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1445 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1446 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1447 .ctrl = OMAP24XX_GPIO_CTRL,
1448 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1449 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1450 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1451 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1452 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1453 };
1454
1455 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1456 .revision = OMAP4_GPIO_REVISION,
1457 .direction = OMAP4_GPIO_OE,
1458 .datain = OMAP4_GPIO_DATAIN,
1459 .dataout = OMAP4_GPIO_DATAOUT,
1460 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1461 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1462 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1463 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1464 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1465 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1466 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1467 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1468 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1469 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1470 .ctrl = OMAP4_GPIO_CTRL,
1471 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1472 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1473 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1474 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1475 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1476 };
1477
1478 static const struct omap_gpio_platform_data omap2_pdata = {
1479 .regs = &omap2_gpio_regs,
1480 .bank_width = 32,
1481 .dbck_flag = false,
1482 };
1483
1484 static const struct omap_gpio_platform_data omap3_pdata = {
1485 .regs = &omap2_gpio_regs,
1486 .bank_width = 32,
1487 .dbck_flag = true,
1488 };
1489
1490 static const struct omap_gpio_platform_data omap4_pdata = {
1491 .regs = &omap4_gpio_regs,
1492 .bank_width = 32,
1493 .dbck_flag = true,
1494 };
1495
1496 static const struct of_device_id omap_gpio_match[] = {
1497 {
1498 .compatible = "ti,omap4-gpio",
1499 .data = &omap4_pdata,
1500 },
1501 {
1502 .compatible = "ti,omap3-gpio",
1503 .data = &omap3_pdata,
1504 },
1505 {
1506 .compatible = "ti,omap2-gpio",
1507 .data = &omap2_pdata,
1508 },
1509 { },
1510 };
1511 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1512 #endif
1513
1514 static struct platform_driver omap_gpio_driver = {
1515 .probe = omap_gpio_probe,
1516 .driver = {
1517 .name = "omap_gpio",
1518 .pm = &gpio_pm_ops,
1519 .of_match_table = of_match_ptr(omap_gpio_match),
1520 },
1521 };
1522
1523 /*
1524 * gpio driver register needs to be done before
1525 * machine_init functions access gpio APIs.
1526 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1527 */
1528 static int __init omap_gpio_drv_reg(void)
1529 {
1530 return platform_driver_register(&omap_gpio_driver);
1531 }
1532 postcore_initcall(omap_gpio_drv_reg);
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