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hwmon: (w83627ehf) Get rid of smatch warnings
[linux-2.6.git] / drivers / gpio / gpio-omap.c
blobf1fbedb2a6f9ac286cd88612251ec3df8fb1e1d1
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/gpio.h>
29 #include <linux/platform_data/gpio-omap.h>
30
31 #include <asm/mach/irq.h>
32
33 #define OFF_MODE 1
34
35 static LIST_HEAD(omap_gpio_list);
36
37 struct gpio_regs {
38 u32 irqenable1;
39 u32 irqenable2;
40 u32 wake_en;
41 u32 ctrl;
42 u32 oe;
43 u32 leveldetect0;
44 u32 leveldetect1;
45 u32 risingdetect;
46 u32 fallingdetect;
47 u32 dataout;
48 u32 debounce;
49 u32 debounce_en;
50 };
51
52 struct gpio_bank {
53 struct list_head node;
54 void __iomem *base;
55 u16 irq;
56 int irq_base;
57 struct irq_domain *domain;
58 u32 non_wakeup_gpios;
59 u32 enabled_non_wakeup_gpios;
60 struct gpio_regs context;
61 u32 saved_datain;
62 u32 level_mask;
63 u32 toggle_mask;
64 spinlock_t lock;
65 struct gpio_chip chip;
66 struct clk *dbck;
67 u32 mod_usage;
68 u32 dbck_enable_mask;
69 bool dbck_enabled;
70 struct device *dev;
71 bool is_mpuio;
72 bool dbck_flag;
73 bool loses_context;
74 int stride;
75 u32 width;
76 int context_loss_count;
77 int power_mode;
78 bool workaround_enabled;
79
80 void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
81 int (*get_context_loss_count)(struct device *dev);
82
83 struct omap_gpio_reg_offs *regs;
84 };
85
86 #define GPIO_INDEX(bank, gpio) (gpio % bank->width)
87 #define GPIO_BIT(bank, gpio) (1 << GPIO_INDEX(bank, gpio))
88 #define GPIO_MOD_CTRL_BIT BIT(0)
89
90 static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
91 {
92 return gpio_irq - bank->irq_base + bank->chip.base;
93 }
94
95 static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
96 {
97 void __iomem *reg = bank->base;
98 u32 l;
99
100 reg += bank->regs->direction;
101 l = __raw_readl(reg);
102 if (is_input)
103 l |= 1 << gpio;
104 else
105 l &= ~(1 << gpio);
106 __raw_writel(l, reg);
107 bank->context.oe = l;
108 }
109
110
111 /* set data out value using dedicate set/clear register */
112 static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable)
113 {
114 void __iomem *reg = bank->base;
115 u32 l = GPIO_BIT(bank, gpio);
116
117 if (enable) {
118 reg += bank->regs->set_dataout;
119 bank->context.dataout |= l;
120 } else {
121 reg += bank->regs->clr_dataout;
122 bank->context.dataout &= ~l;
123 }
124
125 __raw_writel(l, reg);
126 }
127
128 /* set data out value using mask register */
129 static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable)
130 {
131 void __iomem *reg = bank->base + bank->regs->dataout;
132 u32 gpio_bit = GPIO_BIT(bank, gpio);
133 u32 l;
134
135 l = __raw_readl(reg);
136 if (enable)
137 l |= gpio_bit;
138 else
139 l &= ~gpio_bit;
140 __raw_writel(l, reg);
141 bank->context.dataout = l;
142 }
143
144 static int _get_gpio_datain(struct gpio_bank *bank, int offset)
145 {
146 void __iomem *reg = bank->base + bank->regs->datain;
147
148 return (__raw_readl(reg) & (1 << offset)) != 0;
149 }
150
151 static int _get_gpio_dataout(struct gpio_bank *bank, int offset)
152 {
153 void __iomem *reg = bank->base + bank->regs->dataout;
154
155 return (__raw_readl(reg) & (1 << offset)) != 0;
156 }
157
158 static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
159 {
160 int l = __raw_readl(base + reg);
161
162 if (set)
163 l |= mask;
164 else
165 l &= ~mask;
166
167 __raw_writel(l, base + reg);
168 }
169
170 static inline void _gpio_dbck_enable(struct gpio_bank *bank)
171 {
172 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
173 clk_enable(bank->dbck);
174 bank->dbck_enabled = true;
175
176 __raw_writel(bank->dbck_enable_mask,
177 bank->base + bank->regs->debounce_en);
178 }
179 }
180
181 static inline void _gpio_dbck_disable(struct gpio_bank *bank)
182 {
183 if (bank->dbck_enable_mask && bank->dbck_enabled) {
184 /*
185 * Disable debounce before cutting it's clock. If debounce is
186 * enabled but the clock is not, GPIO module seems to be unable
187 * to detect events and generate interrupts at least on OMAP3.
188 */
189 __raw_writel(0, bank->base + bank->regs->debounce_en);
190
191 clk_disable(bank->dbck);
192 bank->dbck_enabled = false;
193 }
194 }
195
196 /**
197 * _set_gpio_debounce - low level gpio debounce time
198 * @bank: the gpio bank we're acting upon
199 * @gpio: the gpio number on this @gpio
200 * @debounce: debounce time to use
201 *
202 * OMAP's debounce time is in 31us steps so we need
203 * to convert and round up to the closest unit.
204 */
205 static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
206 unsigned debounce)
207 {
208 void __iomem *reg;
209 u32 val;
210 u32 l;
211
212 if (!bank->dbck_flag)
213 return;
214
215 if (debounce < 32)
216 debounce = 0x01;
217 else if (debounce > 7936)
218 debounce = 0xff;
219 else
220 debounce = (debounce / 0x1f) - 1;
221
222 l = GPIO_BIT(bank, gpio);
223
224 clk_enable(bank->dbck);
225 reg = bank->base + bank->regs->debounce;
226 __raw_writel(debounce, reg);
227
228 reg = bank->base + bank->regs->debounce_en;
229 val = __raw_readl(reg);
230
231 if (debounce)
232 val |= l;
233 else
234 val &= ~l;
235 bank->dbck_enable_mask = val;
236
237 __raw_writel(val, reg);
238 clk_disable(bank->dbck);
239 /*
240 * Enable debounce clock per module.
241 * This call is mandatory because in omap_gpio_request() when
242 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
243 * runtime callbck fails to turn on dbck because dbck_enable_mask
244 * used within _gpio_dbck_enable() is still not initialized at
245 * that point. Therefore we have to enable dbck here.
246 */
247 _gpio_dbck_enable(bank);
248 if (bank->dbck_enable_mask) {
249 bank->context.debounce = debounce;
250 bank->context.debounce_en = val;
251 }
252 }
253
254 /**
255 * _clear_gpio_debounce - clear debounce settings for a gpio
256 * @bank: the gpio bank we're acting upon
257 * @gpio: the gpio number on this @gpio
258 *
259 * If a gpio is using debounce, then clear the debounce enable bit and if
260 * this is the only gpio in this bank using debounce, then clear the debounce
261 * time too. The debounce clock will also be disabled when calling this function
262 * if this is the only gpio in the bank using debounce.
263 */
264 static void _clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
265 {
266 u32 gpio_bit = GPIO_BIT(bank, gpio);
267
268 if (!bank->dbck_flag)
269 return;
270
271 if (!(bank->dbck_enable_mask & gpio_bit))
272 return;
273
274 bank->dbck_enable_mask &= ~gpio_bit;
275 bank->context.debounce_en &= ~gpio_bit;
276 __raw_writel(bank->context.debounce_en,
277 bank->base + bank->regs->debounce_en);
278
279 if (!bank->dbck_enable_mask) {
280 bank->context.debounce = 0;
281 __raw_writel(bank->context.debounce, bank->base +
282 bank->regs->debounce);
283 clk_disable(bank->dbck);
284 bank->dbck_enabled = false;
285 }
286 }
287
288 static inline void set_gpio_trigger(struct gpio_bank *bank, int gpio,
289 unsigned trigger)
290 {
291 void __iomem *base = bank->base;
292 u32 gpio_bit = 1 << gpio;
293
294 _gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
295 trigger & IRQ_TYPE_LEVEL_LOW);
296 _gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
297 trigger & IRQ_TYPE_LEVEL_HIGH);
298 _gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
299 trigger & IRQ_TYPE_EDGE_RISING);
300 _gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
301 trigger & IRQ_TYPE_EDGE_FALLING);
302
303 bank->context.leveldetect0 =
304 __raw_readl(bank->base + bank->regs->leveldetect0);
305 bank->context.leveldetect1 =
306 __raw_readl(bank->base + bank->regs->leveldetect1);
307 bank->context.risingdetect =
308 __raw_readl(bank->base + bank->regs->risingdetect);
309 bank->context.fallingdetect =
310 __raw_readl(bank->base + bank->regs->fallingdetect);
311
312 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
313 _gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
314 bank->context.wake_en =
315 __raw_readl(bank->base + bank->regs->wkup_en);
316 }
317
318 /* This part needs to be executed always for OMAP{34xx, 44xx} */
319 if (!bank->regs->irqctrl) {
320 /* On omap24xx proceed only when valid GPIO bit is set */
321 if (bank->non_wakeup_gpios) {
322 if (!(bank->non_wakeup_gpios & gpio_bit))
323 goto exit;
324 }
325
326 /*
327 * Log the edge gpio and manually trigger the IRQ
328 * after resume if the input level changes
329 * to avoid irq lost during PER RET/OFF mode
330 * Applies for omap2 non-wakeup gpio and all omap3 gpios
331 */
332 if (trigger & IRQ_TYPE_EDGE_BOTH)
333 bank->enabled_non_wakeup_gpios |= gpio_bit;
334 else
335 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
336 }
337
338 exit:
339 bank->level_mask =
340 __raw_readl(bank->base + bank->regs->leveldetect0) |
341 __raw_readl(bank->base + bank->regs->leveldetect1);
342 }
343
344 #ifdef CONFIG_ARCH_OMAP1
345 /*
346 * This only applies to chips that can't do both rising and falling edge
347 * detection at once. For all other chips, this function is a noop.
348 */
349 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
350 {
351 void __iomem *reg = bank->base;
352 u32 l = 0;
353
354 if (!bank->regs->irqctrl)
355 return;
356
357 reg += bank->regs->irqctrl;
358
359 l = __raw_readl(reg);
360 if ((l >> gpio) & 1)
361 l &= ~(1 << gpio);
362 else
363 l |= 1 << gpio;
364
365 __raw_writel(l, reg);
366 }
367 #else
368 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
369 #endif
370
371 static int _set_gpio_triggering(struct gpio_bank *bank, int gpio,
372 unsigned trigger)
373 {
374 void __iomem *reg = bank->base;
375 void __iomem *base = bank->base;
376 u32 l = 0;
377
378 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
379 set_gpio_trigger(bank, gpio, trigger);
380 } else if (bank->regs->irqctrl) {
381 reg += bank->regs->irqctrl;
382
383 l = __raw_readl(reg);
384 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
385 bank->toggle_mask |= 1 << gpio;
386 if (trigger & IRQ_TYPE_EDGE_RISING)
387 l |= 1 << gpio;
388 else if (trigger & IRQ_TYPE_EDGE_FALLING)
389 l &= ~(1 << gpio);
390 else
391 return -EINVAL;
392
393 __raw_writel(l, reg);
394 } else if (bank->regs->edgectrl1) {
395 if (gpio & 0x08)
396 reg += bank->regs->edgectrl2;
397 else
398 reg += bank->regs->edgectrl1;
399
400 gpio &= 0x07;
401 l = __raw_readl(reg);
402 l &= ~(3 << (gpio << 1));
403 if (trigger & IRQ_TYPE_EDGE_RISING)
404 l |= 2 << (gpio << 1);
405 if (trigger & IRQ_TYPE_EDGE_FALLING)
406 l |= 1 << (gpio << 1);
407
408 /* Enable wake-up during idle for dynamic tick */
409 _gpio_rmw(base, bank->regs->wkup_en, 1 << gpio, trigger);
410 bank->context.wake_en =
411 __raw_readl(bank->base + bank->regs->wkup_en);
412 __raw_writel(l, reg);
413 }
414 return 0;
415 }
416
417 static int gpio_irq_type(struct irq_data *d, unsigned type)
418 {
419 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
420 unsigned gpio = 0;
421 int retval;
422 unsigned long flags;
423
424 #ifdef CONFIG_ARCH_OMAP1
425 if (d->irq > IH_MPUIO_BASE)
426 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
427 #endif
428
429 if (!gpio)
430 gpio = irq_to_gpio(bank, d->irq);
431
432 if (type & ~IRQ_TYPE_SENSE_MASK)
433 return -EINVAL;
434
435 if (!bank->regs->leveldetect0 &&
436 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
437 return -EINVAL;
438
439 spin_lock_irqsave(&bank->lock, flags);
440 retval = _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), type);
441 spin_unlock_irqrestore(&bank->lock, flags);
442
443 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
444 __irq_set_handler_locked(d->irq, handle_level_irq);
445 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
446 __irq_set_handler_locked(d->irq, handle_edge_irq);
447
448 return retval;
449 }
450
451 static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
452 {
453 void __iomem *reg = bank->base;
454
455 reg += bank->regs->irqstatus;
456 __raw_writel(gpio_mask, reg);
457
458 /* Workaround for clearing DSP GPIO interrupts to allow retention */
459 if (bank->regs->irqstatus2) {
460 reg = bank->base + bank->regs->irqstatus2;
461 __raw_writel(gpio_mask, reg);
462 }
463
464 /* Flush posted write for the irq status to avoid spurious interrupts */
465 __raw_readl(reg);
466 }
467
468 static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
469 {
470 _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
471 }
472
473 static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
474 {
475 void __iomem *reg = bank->base;
476 u32 l;
477 u32 mask = (1 << bank->width) - 1;
478
479 reg += bank->regs->irqenable;
480 l = __raw_readl(reg);
481 if (bank->regs->irqenable_inv)
482 l = ~l;
483 l &= mask;
484 return l;
485 }
486
487 static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
488 {
489 void __iomem *reg = bank->base;
490 u32 l;
491
492 if (bank->regs->set_irqenable) {
493 reg += bank->regs->set_irqenable;
494 l = gpio_mask;
495 bank->context.irqenable1 |= gpio_mask;
496 } else {
497 reg += bank->regs->irqenable;
498 l = __raw_readl(reg);
499 if (bank->regs->irqenable_inv)
500 l &= ~gpio_mask;
501 else
502 l |= gpio_mask;
503 bank->context.irqenable1 = l;
504 }
505
506 __raw_writel(l, reg);
507 }
508
509 static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
510 {
511 void __iomem *reg = bank->base;
512 u32 l;
513
514 if (bank->regs->clr_irqenable) {
515 reg += bank->regs->clr_irqenable;
516 l = gpio_mask;
517 bank->context.irqenable1 &= ~gpio_mask;
518 } else {
519 reg += bank->regs->irqenable;
520 l = __raw_readl(reg);
521 if (bank->regs->irqenable_inv)
522 l |= gpio_mask;
523 else
524 l &= ~gpio_mask;
525 bank->context.irqenable1 = l;
526 }
527
528 __raw_writel(l, reg);
529 }
530
531 static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
532 {
533 if (enable)
534 _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
535 else
536 _disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
537 }
538
539 /*
540 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
541 * 1510 does not seem to have a wake-up register. If JTAG is connected
542 * to the target, system will wake up always on GPIO events. While
543 * system is running all registered GPIO interrupts need to have wake-up
544 * enabled. When system is suspended, only selected GPIO interrupts need
545 * to have wake-up enabled.
546 */
547 static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
548 {
549 u32 gpio_bit = GPIO_BIT(bank, gpio);
550 unsigned long flags;
551
552 if (bank->non_wakeup_gpios & gpio_bit) {
553 dev_err(bank->dev,
554 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
555 return -EINVAL;
556 }
557
558 spin_lock_irqsave(&bank->lock, flags);
559 if (enable)
560 bank->context.wake_en |= gpio_bit;
561 else
562 bank->context.wake_en &= ~gpio_bit;
563
564 __raw_writel(bank->context.wake_en, bank->base + bank->regs->wkup_en);
565 spin_unlock_irqrestore(&bank->lock, flags);
566
567 return 0;
568 }
569
570 static void _reset_gpio(struct gpio_bank *bank, int gpio)
571 {
572 _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
573 _set_gpio_irqenable(bank, gpio, 0);
574 _clear_gpio_irqstatus(bank, gpio);
575 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
576 _clear_gpio_debounce(bank, gpio);
577 }
578
579 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
580 static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
581 {
582 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
583 unsigned int gpio = irq_to_gpio(bank, d->irq);
584
585 return _set_gpio_wakeup(bank, gpio, enable);
586 }
587
588 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
589 {
590 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
591 unsigned long flags;
592
593 /*
594 * If this is the first gpio_request for the bank,
595 * enable the bank module.
596 */
597 if (!bank->mod_usage)
598 pm_runtime_get_sync(bank->dev);
599
600 spin_lock_irqsave(&bank->lock, flags);
601 /* Set trigger to none. You need to enable the desired trigger with
602 * request_irq() or set_irq_type().
603 */
604 _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
605
606 if (bank->regs->pinctrl) {
607 void __iomem *reg = bank->base + bank->regs->pinctrl;
608
609 /* Claim the pin for MPU */
610 __raw_writel(__raw_readl(reg) | (1 << offset), reg);
611 }
612
613 if (bank->regs->ctrl && !bank->mod_usage) {
614 void __iomem *reg = bank->base + bank->regs->ctrl;
615 u32 ctrl;
616
617 ctrl = __raw_readl(reg);
618 /* Module is enabled, clocks are not gated */
619 ctrl &= ~GPIO_MOD_CTRL_BIT;
620 __raw_writel(ctrl, reg);
621 bank->context.ctrl = ctrl;
622 }
623
624 bank->mod_usage |= 1 << offset;
625
626 spin_unlock_irqrestore(&bank->lock, flags);
627
628 return 0;
629 }
630
631 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
632 {
633 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
634 void __iomem *base = bank->base;
635 unsigned long flags;
636
637 spin_lock_irqsave(&bank->lock, flags);
638
639 if (bank->regs->wkup_en) {
640 /* Disable wake-up during idle for dynamic tick */
641 _gpio_rmw(base, bank->regs->wkup_en, 1 << offset, 0);
642 bank->context.wake_en =
643 __raw_readl(bank->base + bank->regs->wkup_en);
644 }
645
646 bank->mod_usage &= ~(1 << offset);
647
648 if (bank->regs->ctrl && !bank->mod_usage) {
649 void __iomem *reg = bank->base + bank->regs->ctrl;
650 u32 ctrl;
651
652 ctrl = __raw_readl(reg);
653 /* Module is disabled, clocks are gated */
654 ctrl |= GPIO_MOD_CTRL_BIT;
655 __raw_writel(ctrl, reg);
656 bank->context.ctrl = ctrl;
657 }
658
659 _reset_gpio(bank, bank->chip.base + offset);
660 spin_unlock_irqrestore(&bank->lock, flags);
661
662 /*
663 * If this is the last gpio to be freed in the bank,
664 * disable the bank module.
665 */
666 if (!bank->mod_usage)
667 pm_runtime_put(bank->dev);
668 }
669
670 /*
671 * We need to unmask the GPIO bank interrupt as soon as possible to
672 * avoid missing GPIO interrupts for other lines in the bank.
673 * Then we need to mask-read-clear-unmask the triggered GPIO lines
674 * in the bank to avoid missing nested interrupts for a GPIO line.
675 * If we wait to unmask individual GPIO lines in the bank after the
676 * line's interrupt handler has been run, we may miss some nested
677 * interrupts.
678 */
679 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
680 {
681 void __iomem *isr_reg = NULL;
682 u32 isr;
683 unsigned int gpio_irq, gpio_index;
684 struct gpio_bank *bank;
685 int unmasked = 0;
686 struct irq_chip *chip = irq_desc_get_chip(desc);
687
688 chained_irq_enter(chip, desc);
689
690 bank = irq_get_handler_data(irq);
691 isr_reg = bank->base + bank->regs->irqstatus;
692 pm_runtime_get_sync(bank->dev);
693
694 if (WARN_ON(!isr_reg))
695 goto exit;
696
697 while(1) {
698 u32 isr_saved, level_mask = 0;
699 u32 enabled;
700
701 enabled = _get_gpio_irqbank_mask(bank);
702 isr_saved = isr = __raw_readl(isr_reg) & enabled;
703
704 if (bank->level_mask)
705 level_mask = bank->level_mask & enabled;
706
707 /* clear edge sensitive interrupts before handler(s) are
708 called so that we don't miss any interrupt occurred while
709 executing them */
710 _disable_gpio_irqbank(bank, isr_saved & ~level_mask);
711 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
712 _enable_gpio_irqbank(bank, isr_saved & ~level_mask);
713
714 /* if there is only edge sensitive GPIO pin interrupts
715 configured, we could unmask GPIO bank interrupt immediately */
716 if (!level_mask && !unmasked) {
717 unmasked = 1;
718 chained_irq_exit(chip, desc);
719 }
720
721 if (!isr)
722 break;
723
724 gpio_irq = bank->irq_base;
725 for (; isr != 0; isr >>= 1, gpio_irq++) {
726 int gpio = irq_to_gpio(bank, gpio_irq);
727
728 if (!(isr & 1))
729 continue;
730
731 gpio_index = GPIO_INDEX(bank, gpio);
732
733 /*
734 * Some chips can't respond to both rising and falling
735 * at the same time. If this irq was requested with
736 * both flags, we need to flip the ICR data for the IRQ
737 * to respond to the IRQ for the opposite direction.
738 * This will be indicated in the bank toggle_mask.
739 */
740 if (bank->toggle_mask & (1 << gpio_index))
741 _toggle_gpio_edge_triggering(bank, gpio_index);
742
743 generic_handle_irq(gpio_irq);
744 }
745 }
746 /* if bank has any level sensitive GPIO pin interrupt
747 configured, we must unmask the bank interrupt only after
748 handler(s) are executed in order to avoid spurious bank
749 interrupt */
750 exit:
751 if (!unmasked)
752 chained_irq_exit(chip, desc);
753 pm_runtime_put(bank->dev);
754 }
755
756 static void gpio_irq_shutdown(struct irq_data *d)
757 {
758 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
759 unsigned int gpio = irq_to_gpio(bank, d->irq);
760 unsigned long flags;
761
762 spin_lock_irqsave(&bank->lock, flags);
763 _reset_gpio(bank, gpio);
764 spin_unlock_irqrestore(&bank->lock, flags);
765 }
766
767 static void gpio_ack_irq(struct irq_data *d)
768 {
769 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
770 unsigned int gpio = irq_to_gpio(bank, d->irq);
771
772 _clear_gpio_irqstatus(bank, gpio);
773 }
774
775 static void gpio_mask_irq(struct irq_data *d)
776 {
777 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
778 unsigned int gpio = irq_to_gpio(bank, d->irq);
779 unsigned long flags;
780
781 spin_lock_irqsave(&bank->lock, flags);
782 _set_gpio_irqenable(bank, gpio, 0);
783 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
784 spin_unlock_irqrestore(&bank->lock, flags);
785 }
786
787 static void gpio_unmask_irq(struct irq_data *d)
788 {
789 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
790 unsigned int gpio = irq_to_gpio(bank, d->irq);
791 unsigned int irq_mask = GPIO_BIT(bank, gpio);
792 u32 trigger = irqd_get_trigger_type(d);
793 unsigned long flags;
794
795 spin_lock_irqsave(&bank->lock, flags);
796 if (trigger)
797 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
798
799 /* For level-triggered GPIOs, the clearing must be done after
800 * the HW source is cleared, thus after the handler has run */
801 if (bank->level_mask & irq_mask) {
802 _set_gpio_irqenable(bank, gpio, 0);
803 _clear_gpio_irqstatus(bank, gpio);
804 }
805
806 _set_gpio_irqenable(bank, gpio, 1);
807 spin_unlock_irqrestore(&bank->lock, flags);
808 }
809
810 static struct irq_chip gpio_irq_chip = {
811 .name = "GPIO",
812 .irq_shutdown = gpio_irq_shutdown,
813 .irq_ack = gpio_ack_irq,
814 .irq_mask = gpio_mask_irq,
815 .irq_unmask = gpio_unmask_irq,
816 .irq_set_type = gpio_irq_type,
817 .irq_set_wake = gpio_wake_enable,
818 };
819
820 /*---------------------------------------------------------------------*/
821
822 static int omap_mpuio_suspend_noirq(struct device *dev)
823 {
824 struct platform_device *pdev = to_platform_device(dev);
825 struct gpio_bank *bank = platform_get_drvdata(pdev);
826 void __iomem *mask_reg = bank->base +
827 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
828 unsigned long flags;
829
830 spin_lock_irqsave(&bank->lock, flags);
831 __raw_writel(0xffff & ~bank->context.wake_en, mask_reg);
832 spin_unlock_irqrestore(&bank->lock, flags);
833
834 return 0;
835 }
836
837 static int omap_mpuio_resume_noirq(struct device *dev)
838 {
839 struct platform_device *pdev = to_platform_device(dev);
840 struct gpio_bank *bank = platform_get_drvdata(pdev);
841 void __iomem *mask_reg = bank->base +
842 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
843 unsigned long flags;
844
845 spin_lock_irqsave(&bank->lock, flags);
846 __raw_writel(bank->context.wake_en, mask_reg);
847 spin_unlock_irqrestore(&bank->lock, flags);
848
849 return 0;
850 }
851
852 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
853 .suspend_noirq = omap_mpuio_suspend_noirq,
854 .resume_noirq = omap_mpuio_resume_noirq,
855 };
856
857 /* use platform_driver for this. */
858 static struct platform_driver omap_mpuio_driver = {
859 .driver = {
860 .name = "mpuio",
861 .pm = &omap_mpuio_dev_pm_ops,
862 },
863 };
864
865 static struct platform_device omap_mpuio_device = {
866 .name = "mpuio",
867 .id = -1,
868 .dev = {
869 .driver = &omap_mpuio_driver.driver,
870 }
871 /* could list the /proc/iomem resources */
872 };
873
874 static inline void mpuio_init(struct gpio_bank *bank)
875 {
876 platform_set_drvdata(&omap_mpuio_device, bank);
877
878 if (platform_driver_register(&omap_mpuio_driver) == 0)
879 (void) platform_device_register(&omap_mpuio_device);
880 }
881
882 /*---------------------------------------------------------------------*/
883
884 static int gpio_input(struct gpio_chip *chip, unsigned offset)
885 {
886 struct gpio_bank *bank;
887 unsigned long flags;
888
889 bank = container_of(chip, struct gpio_bank, chip);
890 spin_lock_irqsave(&bank->lock, flags);
891 _set_gpio_direction(bank, offset, 1);
892 spin_unlock_irqrestore(&bank->lock, flags);
893 return 0;
894 }
895
896 static int gpio_is_input(struct gpio_bank *bank, int mask)
897 {
898 void __iomem *reg = bank->base + bank->regs->direction;
899
900 return __raw_readl(reg) & mask;
901 }
902
903 static int gpio_get(struct gpio_chip *chip, unsigned offset)
904 {
905 struct gpio_bank *bank;
906 u32 mask;
907
908 bank = container_of(chip, struct gpio_bank, chip);
909 mask = (1 << offset);
910
911 if (gpio_is_input(bank, mask))
912 return _get_gpio_datain(bank, offset);
913 else
914 return _get_gpio_dataout(bank, offset);
915 }
916
917 static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
918 {
919 struct gpio_bank *bank;
920 unsigned long flags;
921
922 bank = container_of(chip, struct gpio_bank, chip);
923 spin_lock_irqsave(&bank->lock, flags);
924 bank->set_dataout(bank, offset, value);
925 _set_gpio_direction(bank, offset, 0);
926 spin_unlock_irqrestore(&bank->lock, flags);
927 return 0;
928 }
929
930 static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
931 unsigned debounce)
932 {
933 struct gpio_bank *bank;
934 unsigned long flags;
935
936 bank = container_of(chip, struct gpio_bank, chip);
937
938 spin_lock_irqsave(&bank->lock, flags);
939 _set_gpio_debounce(bank, offset, debounce);
940 spin_unlock_irqrestore(&bank->lock, flags);
941
942 return 0;
943 }
944
945 static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
946 {
947 struct gpio_bank *bank;
948 unsigned long flags;
949
950 bank = container_of(chip, struct gpio_bank, chip);
951 spin_lock_irqsave(&bank->lock, flags);
952 bank->set_dataout(bank, offset, value);
953 spin_unlock_irqrestore(&bank->lock, flags);
954 }
955
956 static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
957 {
958 struct gpio_bank *bank;
959
960 bank = container_of(chip, struct gpio_bank, chip);
961 return bank->irq_base + offset;
962 }
963
964 /*---------------------------------------------------------------------*/
965
966 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
967 {
968 static bool called;
969 u32 rev;
970
971 if (called || bank->regs->revision == USHRT_MAX)
972 return;
973
974 rev = __raw_readw(bank->base + bank->regs->revision);
975 pr_info("OMAP GPIO hardware version %d.%d\n",
976 (rev >> 4) & 0x0f, rev & 0x0f);
977
978 called = true;
979 }
980
981 /* This lock class tells lockdep that GPIO irqs are in a different
982 * category than their parents, so it won't report false recursion.
983 */
984 static struct lock_class_key gpio_lock_class;
985
986 static void omap_gpio_mod_init(struct gpio_bank *bank)
987 {
988 void __iomem *base = bank->base;
989 u32 l = 0xffffffff;
990
991 if (bank->width == 16)
992 l = 0xffff;
993
994 if (bank->is_mpuio) {
995 __raw_writel(l, bank->base + bank->regs->irqenable);
996 return;
997 }
998
999 _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv);
1000 _gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv);
1001 if (bank->regs->debounce_en)
1002 __raw_writel(0, base + bank->regs->debounce_en);
1003
1004 /* Save OE default value (0xffffffff) in the context */
1005 bank->context.oe = __raw_readl(bank->base + bank->regs->direction);
1006 /* Initialize interface clk ungated, module enabled */
1007 if (bank->regs->ctrl)
1008 __raw_writel(0, base + bank->regs->ctrl);
1009
1010 bank->dbck = clk_get(bank->dev, "dbclk");
1011 if (IS_ERR(bank->dbck))
1012 dev_err(bank->dev, "Could not get gpio dbck\n");
1013 }
1014
1015 static void
1016 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1017 unsigned int num)
1018 {
1019 struct irq_chip_generic *gc;
1020 struct irq_chip_type *ct;
1021
1022 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1023 handle_simple_irq);
1024 if (!gc) {
1025 dev_err(bank->dev, "Memory alloc failed for gc\n");
1026 return;
1027 }
1028
1029 ct = gc->chip_types;
1030
1031 /* NOTE: No ack required, reading IRQ status clears it. */
1032 ct->chip.irq_mask = irq_gc_mask_set_bit;
1033 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1034 ct->chip.irq_set_type = gpio_irq_type;
1035
1036 if (bank->regs->wkup_en)
1037 ct->chip.irq_set_wake = gpio_wake_enable,
1038
1039 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1040 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1041 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1042 }
1043
1044 static void omap_gpio_chip_init(struct gpio_bank *bank)
1045 {
1046 int j;
1047 static int gpio;
1048
1049 /*
1050 * REVISIT eventually switch from OMAP-specific gpio structs
1051 * over to the generic ones
1052 */
1053 bank->chip.request = omap_gpio_request;
1054 bank->chip.free = omap_gpio_free;
1055 bank->chip.direction_input = gpio_input;
1056 bank->chip.get = gpio_get;
1057 bank->chip.direction_output = gpio_output;
1058 bank->chip.set_debounce = gpio_debounce;
1059 bank->chip.set = gpio_set;
1060 bank->chip.to_irq = gpio_2irq;
1061 if (bank->is_mpuio) {
1062 bank->chip.label = "mpuio";
1063 if (bank->regs->wkup_en)
1064 bank->chip.dev = &omap_mpuio_device.dev;
1065 bank->chip.base = OMAP_MPUIO(0);
1066 } else {
1067 bank->chip.label = "gpio";
1068 bank->chip.base = gpio;
1069 gpio += bank->width;
1070 }
1071 bank->chip.ngpio = bank->width;
1072
1073 gpiochip_add(&bank->chip);
1074
1075 for (j = bank->irq_base; j < bank->irq_base + bank->width; j++) {
1076 irq_set_lockdep_class(j, &gpio_lock_class);
1077 irq_set_chip_data(j, bank);
1078 if (bank->is_mpuio) {
1079 omap_mpuio_alloc_gc(bank, j, bank->width);
1080 } else {
1081 irq_set_chip(j, &gpio_irq_chip);
1082 irq_set_handler(j, handle_simple_irq);
1083 set_irq_flags(j, IRQF_VALID);
1084 }
1085 }
1086 irq_set_chained_handler(bank->irq, gpio_irq_handler);
1087 irq_set_handler_data(bank->irq, bank);
1088 }
1089
1090 static const struct of_device_id omap_gpio_match[];
1091
1092 static int omap_gpio_probe(struct platform_device *pdev)
1093 {
1094 struct device *dev = &pdev->dev;
1095 struct device_node *node = dev->of_node;
1096 const struct of_device_id *match;
1097 const struct omap_gpio_platform_data *pdata;
1098 struct resource *res;
1099 struct gpio_bank *bank;
1100 int ret = 0;
1101
1102 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1103
1104 pdata = match ? match->data : dev->platform_data;
1105 if (!pdata)
1106 return -EINVAL;
1107
1108 bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1109 if (!bank) {
1110 dev_err(dev, "Memory alloc failed\n");
1111 return -ENOMEM;
1112 }
1113
1114 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1115 if (unlikely(!res)) {
1116 dev_err(dev, "Invalid IRQ resource\n");
1117 return -ENODEV;
1118 }
1119
1120 bank->irq = res->start;
1121 bank->dev = dev;
1122 bank->dbck_flag = pdata->dbck_flag;
1123 bank->stride = pdata->bank_stride;
1124 bank->width = pdata->bank_width;
1125 bank->is_mpuio = pdata->is_mpuio;
1126 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1127 bank->loses_context = pdata->loses_context;
1128 bank->regs = pdata->regs;
1129 #ifdef CONFIG_OF_GPIO
1130 bank->chip.of_node = of_node_get(node);
1131 #endif
1132
1133 bank->irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1134 if (bank->irq_base < 0) {
1135 dev_err(dev, "Couldn't allocate IRQ numbers\n");
1136 return -ENODEV;
1137 }
1138
1139 bank->domain = irq_domain_add_legacy(node, bank->width, bank->irq_base,
1140 0, &irq_domain_simple_ops, NULL);
1141
1142 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1143 bank->set_dataout = _set_gpio_dataout_reg;
1144 else
1145 bank->set_dataout = _set_gpio_dataout_mask;
1146
1147 spin_lock_init(&bank->lock);
1148
1149 /* Static mapping, never released */
1150 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1151 if (unlikely(!res)) {
1152 dev_err(dev, "Invalid mem resource\n");
1153 return -ENODEV;
1154 }
1155
1156 if (!devm_request_mem_region(dev, res->start, resource_size(res),
1157 pdev->name)) {
1158 dev_err(dev, "Region already claimed\n");
1159 return -EBUSY;
1160 }
1161
1162 bank->base = devm_ioremap(dev, res->start, resource_size(res));
1163 if (!bank->base) {
1164 dev_err(dev, "Could not ioremap\n");
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 ret;
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 int context_lost_cnt_after;
1267 u32 l = 0, gen, gen0, gen1;
1268 unsigned long flags;
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->get_context_loss_count) {
1285 context_lost_cnt_after =
1286 bank->get_context_loss_count(bank->dev);
1287 if (context_lost_cnt_after != bank->context_loss_count) {
1288 omap_gpio_restore_context(bank);
1289 } else {
1290 spin_unlock_irqrestore(&bank->lock, flags);
1291 return 0;
1292 }
1293 }
1294
1295 if (!bank->workaround_enabled) {
1296 spin_unlock_irqrestore(&bank->lock, flags);
1297 return 0;
1298 }
1299
1300 __raw_writel(bank->context.fallingdetect,
1301 bank->base + bank->regs->fallingdetect);
1302 __raw_writel(bank->context.risingdetect,
1303 bank->base + bank->regs->risingdetect);
1304 l = __raw_readl(bank->base + bank->regs->datain);
1305
1306 /*
1307 * Check if any of the non-wakeup interrupt GPIOs have changed
1308 * state. If so, generate an IRQ by software. This is
1309 * horribly racy, but it's the best we can do to work around
1310 * this silicon bug.
1311 */
1312 l ^= bank->saved_datain;
1313 l &= bank->enabled_non_wakeup_gpios;
1314
1315 /*
1316 * No need to generate IRQs for the rising edge for gpio IRQs
1317 * configured with falling edge only; and vice versa.
1318 */
1319 gen0 = l & bank->context.fallingdetect;
1320 gen0 &= bank->saved_datain;
1321
1322 gen1 = l & bank->context.risingdetect;
1323 gen1 &= ~(bank->saved_datain);
1324
1325 /* FIXME: Consider GPIO IRQs with level detections properly! */
1326 gen = l & (~(bank->context.fallingdetect) &
1327 ~(bank->context.risingdetect));
1328 /* Consider all GPIO IRQs needed to be updated */
1329 gen |= gen0 | gen1;
1330
1331 if (gen) {
1332 u32 old0, old1;
1333
1334 old0 = __raw_readl(bank->base + bank->regs->leveldetect0);
1335 old1 = __raw_readl(bank->base + bank->regs->leveldetect1);
1336
1337 if (!bank->regs->irqstatus_raw0) {
1338 __raw_writel(old0 | gen, bank->base +
1339 bank->regs->leveldetect0);
1340 __raw_writel(old1 | gen, bank->base +
1341 bank->regs->leveldetect1);
1342 }
1343
1344 if (bank->regs->irqstatus_raw0) {
1345 __raw_writel(old0 | l, bank->base +
1346 bank->regs->leveldetect0);
1347 __raw_writel(old1 | l, bank->base +
1348 bank->regs->leveldetect1);
1349 }
1350 __raw_writel(old0, bank->base + bank->regs->leveldetect0);
1351 __raw_writel(old1, bank->base + bank->regs->leveldetect1);
1352 }
1353
1354 bank->workaround_enabled = false;
1355 spin_unlock_irqrestore(&bank->lock, flags);
1356
1357 return 0;
1358 }
1359 #endif /* CONFIG_PM_RUNTIME */
1360
1361 void omap2_gpio_prepare_for_idle(int pwr_mode)
1362 {
1363 struct gpio_bank *bank;
1364
1365 list_for_each_entry(bank, &omap_gpio_list, node) {
1366 if (!bank->mod_usage || !bank->loses_context)
1367 continue;
1368
1369 bank->power_mode = pwr_mode;
1370
1371 pm_runtime_put_sync_suspend(bank->dev);
1372 }
1373 }
1374
1375 void omap2_gpio_resume_after_idle(void)
1376 {
1377 struct gpio_bank *bank;
1378
1379 list_for_each_entry(bank, &omap_gpio_list, node) {
1380 if (!bank->mod_usage || !bank->loses_context)
1381 continue;
1382
1383 pm_runtime_get_sync(bank->dev);
1384 }
1385 }
1386
1387 #if defined(CONFIG_PM_RUNTIME)
1388 static void omap_gpio_restore_context(struct gpio_bank *bank)
1389 {
1390 __raw_writel(bank->context.wake_en,
1391 bank->base + bank->regs->wkup_en);
1392 __raw_writel(bank->context.ctrl, bank->base + bank->regs->ctrl);
1393 __raw_writel(bank->context.leveldetect0,
1394 bank->base + bank->regs->leveldetect0);
1395 __raw_writel(bank->context.leveldetect1,
1396 bank->base + bank->regs->leveldetect1);
1397 __raw_writel(bank->context.risingdetect,
1398 bank->base + bank->regs->risingdetect);
1399 __raw_writel(bank->context.fallingdetect,
1400 bank->base + bank->regs->fallingdetect);
1401 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1402 __raw_writel(bank->context.dataout,
1403 bank->base + bank->regs->set_dataout);
1404 else
1405 __raw_writel(bank->context.dataout,
1406 bank->base + bank->regs->dataout);
1407 __raw_writel(bank->context.oe, bank->base + bank->regs->direction);
1408
1409 if (bank->dbck_enable_mask) {
1410 __raw_writel(bank->context.debounce, bank->base +
1411 bank->regs->debounce);
1412 __raw_writel(bank->context.debounce_en,
1413 bank->base + bank->regs->debounce_en);
1414 }
1415
1416 __raw_writel(bank->context.irqenable1,
1417 bank->base + bank->regs->irqenable);
1418 __raw_writel(bank->context.irqenable2,
1419 bank->base + bank->regs->irqenable2);
1420 }
1421 #endif /* CONFIG_PM_RUNTIME */
1422 #else
1423 #define omap_gpio_runtime_suspend NULL
1424 #define omap_gpio_runtime_resume NULL
1425 #endif
1426
1427 static const struct dev_pm_ops gpio_pm_ops = {
1428 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1429 NULL)
1430 };
1431
1432 #if defined(CONFIG_OF)
1433 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1434 .revision = OMAP24XX_GPIO_REVISION,
1435 .direction = OMAP24XX_GPIO_OE,
1436 .datain = OMAP24XX_GPIO_DATAIN,
1437 .dataout = OMAP24XX_GPIO_DATAOUT,
1438 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1439 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1440 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1441 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1442 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1443 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1444 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1445 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1446 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1447 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1448 .ctrl = OMAP24XX_GPIO_CTRL,
1449 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1450 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1451 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1452 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1453 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1454 };
1455
1456 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1457 .revision = OMAP4_GPIO_REVISION,
1458 .direction = OMAP4_GPIO_OE,
1459 .datain = OMAP4_GPIO_DATAIN,
1460 .dataout = OMAP4_GPIO_DATAOUT,
1461 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1462 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1463 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1464 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1465 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1466 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1467 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1468 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1469 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1470 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1471 .ctrl = OMAP4_GPIO_CTRL,
1472 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1473 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1474 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1475 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1476 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1477 };
1478
1479 const static struct omap_gpio_platform_data omap2_pdata = {
1480 .regs = &omap2_gpio_regs,
1481 .bank_width = 32,
1482 .dbck_flag = false,
1483 };
1484
1485 const static struct omap_gpio_platform_data omap3_pdata = {
1486 .regs = &omap2_gpio_regs,
1487 .bank_width = 32,
1488 .dbck_flag = true,
1489 };
1490
1491 const static struct omap_gpio_platform_data omap4_pdata = {
1492 .regs = &omap4_gpio_regs,
1493 .bank_width = 32,
1494 .dbck_flag = true,
1495 };
1496
1497 static const struct of_device_id omap_gpio_match[] = {
1498 {
1499 .compatible = "ti,omap4-gpio",
1500 .data = &omap4_pdata,
1501 },
1502 {
1503 .compatible = "ti,omap3-gpio",
1504 .data = &omap3_pdata,
1505 },
1506 {
1507 .compatible = "ti,omap2-gpio",
1508 .data = &omap2_pdata,
1509 },
1510 { },
1511 };
1512 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1513 #endif
1514
1515 static struct platform_driver omap_gpio_driver = {
1516 .probe = omap_gpio_probe,
1517 .driver = {
1518 .name = "omap_gpio",
1519 .pm = &gpio_pm_ops,
1520 .of_match_table = of_match_ptr(omap_gpio_match),
1521 },
1522 };
1523
1524 /*
1525 * gpio driver register needs to be done before
1526 * machine_init functions access gpio APIs.
1527 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1528 */
1529 static int __init omap_gpio_drv_reg(void)
1530 {
1531 return platform_driver_register(&omap_gpio_driver);
1532 }
1533 postcore_initcall(omap_gpio_drv_reg);
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