Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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/gpio.h>
 28 #include <linux/bitops.h>
 29 #include <linux/platform_data/gpio-omap.h>
 30 
 31 #define OFF_MODE        1
 32 
 33 static LIST_HEAD(omap_gpio_list);
 34 
 35 struct gpio_regs {
 36         u32 irqenable1;
 37         u32 irqenable2;
 38         u32 wake_en;
 39         u32 ctrl;
 40         u32 oe;
 41         u32 leveldetect0;
 42         u32 leveldetect1;
 43         u32 risingdetect;
 44         u32 fallingdetect;
 45         u32 dataout;
 46         u32 debounce;
 47         u32 debounce_en;
 48 };
 49 
 50 struct gpio_bank {
 51         struct list_head node;
 52         void __iomem *base;
 53         u16 irq;
 54         u32 non_wakeup_gpios;
 55         u32 enabled_non_wakeup_gpios;
 56         struct gpio_regs context;
 57         u32 saved_datain;
 58         u32 level_mask;
 59         u32 toggle_mask;
 60         spinlock_t lock;
 61         struct gpio_chip chip;
 62         struct clk *dbck;
 63         u32 mod_usage;
 64         u32 irq_usage;
 65         u32 dbck_enable_mask;
 66         bool dbck_enabled;
 67         struct device *dev;
 68         bool is_mpuio;
 69         bool dbck_flag;
 70         bool loses_context;
 71         bool context_valid;
 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) (BIT(GPIO_INDEX(bank, gpio)))
 86 #define GPIO_MOD_CTRL_BIT       BIT(0)
 87 
 88 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
 89 #define LINE_USED(line, offset) (line & (BIT(offset)))
 90 
 91 static int omap_irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
 92 {
 93         return bank->chip.base + gpio_irq;
 94 }
 95 
 96 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
 97 {
 98         struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 99         return container_of(chip, struct gpio_bank, chip);
100 }
101 
102 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
103                                     int is_input)
104 {
105         void __iomem *reg = bank->base;
106         u32 l;
107 
108         reg += bank->regs->direction;
109         l = readl_relaxed(reg);
110         if (is_input)
111                 l |= BIT(gpio);
112         else
113                 l &= ~(BIT(gpio));
114         writel_relaxed(l, reg);
115         bank->context.oe = l;
116 }
117 
118 
119 /* set data out value using dedicate set/clear register */
120 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, int gpio,
121                                       int enable)
122 {
123         void __iomem *reg = bank->base;
124         u32 l = GPIO_BIT(bank, gpio);
125 
126         if (enable) {
127                 reg += bank->regs->set_dataout;
128                 bank->context.dataout |= l;
129         } else {
130                 reg += bank->regs->clr_dataout;
131                 bank->context.dataout &= ~l;
132         }
133 
134         writel_relaxed(l, reg);
135 }
136 
137 /* set data out value using mask register */
138 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, int gpio,
139                                        int enable)
140 {
141         void __iomem *reg = bank->base + bank->regs->dataout;
142         u32 gpio_bit = GPIO_BIT(bank, gpio);
143         u32 l;
144 
145         l = readl_relaxed(reg);
146         if (enable)
147                 l |= gpio_bit;
148         else
149                 l &= ~gpio_bit;
150         writel_relaxed(l, reg);
151         bank->context.dataout = l;
152 }
153 
154 static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
155 {
156         void __iomem *reg = bank->base + bank->regs->datain;
157 
158         return (readl_relaxed(reg) & (BIT(offset))) != 0;
159 }
160 
161 static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
162 {
163         void __iomem *reg = bank->base + bank->regs->dataout;
164 
165         return (readl_relaxed(reg) & (BIT(offset))) != 0;
166 }
167 
168 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
169 {
170         int l = readl_relaxed(base + reg);
171 
172         if (set)
173                 l |= mask;
174         else
175                 l &= ~mask;
176 
177         writel_relaxed(l, base + reg);
178 }
179 
180 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
181 {
182         if (bank->dbck_enable_mask && !bank->dbck_enabled) {
183                 clk_prepare_enable(bank->dbck);
184                 bank->dbck_enabled = true;
185 
186                 writel_relaxed(bank->dbck_enable_mask,
187                              bank->base + bank->regs->debounce_en);
188         }
189 }
190 
191 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
192 {
193         if (bank->dbck_enable_mask && bank->dbck_enabled) {
194                 /*
195                  * Disable debounce before cutting it's clock. If debounce is
196                  * enabled but the clock is not, GPIO module seems to be unable
197                  * to detect events and generate interrupts at least on OMAP3.
198                  */
199                 writel_relaxed(0, bank->base + bank->regs->debounce_en);
200 
201                 clk_disable_unprepare(bank->dbck);
202                 bank->dbck_enabled = false;
203         }
204 }
205 
206 /**
207  * omap2_set_gpio_debounce - low level gpio debounce time
208  * @bank: the gpio bank we're acting upon
209  * @gpio: the gpio number on this @gpio
210  * @debounce: debounce time to use
211  *
212  * OMAP's debounce time is in 31us steps so we need
213  * to convert and round up to the closest unit.
214  */
215 static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
216                                     unsigned debounce)
217 {
218         void __iomem            *reg;
219         u32                     val;
220         u32                     l;
221 
222         if (!bank->dbck_flag)
223                 return;
224 
225         if (debounce < 32)
226                 debounce = 0x01;
227         else if (debounce > 7936)
228                 debounce = 0xff;
229         else
230                 debounce = (debounce / 0x1f) - 1;
231 
232         l = GPIO_BIT(bank, gpio);
233 
234         clk_prepare_enable(bank->dbck);
235         reg = bank->base + bank->regs->debounce;
236         writel_relaxed(debounce, reg);
237 
238         reg = bank->base + bank->regs->debounce_en;
239         val = readl_relaxed(reg);
240 
241         if (debounce)
242                 val |= l;
243         else
244                 val &= ~l;
245         bank->dbck_enable_mask = val;
246 
247         writel_relaxed(val, reg);
248         clk_disable_unprepare(bank->dbck);
249         /*
250          * Enable debounce clock per module.
251          * This call is mandatory because in omap_gpio_request() when
252          * *_runtime_get_sync() is called,  _gpio_dbck_enable() within
253          * runtime callbck fails to turn on dbck because dbck_enable_mask
254          * used within _gpio_dbck_enable() is still not initialized at
255          * that point. Therefore we have to enable dbck here.
256          */
257         omap_gpio_dbck_enable(bank);
258         if (bank->dbck_enable_mask) {
259                 bank->context.debounce = debounce;
260                 bank->context.debounce_en = val;
261         }
262 }
263 
264 /**
265  * omap_clear_gpio_debounce - clear debounce settings for a gpio
266  * @bank: the gpio bank we're acting upon
267  * @gpio: the gpio number on this @gpio
268  *
269  * If a gpio is using debounce, then clear the debounce enable bit and if
270  * this is the only gpio in this bank using debounce, then clear the debounce
271  * time too. The debounce clock will also be disabled when calling this function
272  * if this is the only gpio in the bank using debounce.
273  */
274 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
275 {
276         u32 gpio_bit = GPIO_BIT(bank, gpio);
277 
278         if (!bank->dbck_flag)
279                 return;
280 
281         if (!(bank->dbck_enable_mask & gpio_bit))
282                 return;
283 
284         bank->dbck_enable_mask &= ~gpio_bit;
285         bank->context.debounce_en &= ~gpio_bit;
286         writel_relaxed(bank->context.debounce_en,
287                      bank->base + bank->regs->debounce_en);
288 
289         if (!bank->dbck_enable_mask) {
290                 bank->context.debounce = 0;
291                 writel_relaxed(bank->context.debounce, bank->base +
292                              bank->regs->debounce);
293                 clk_disable_unprepare(bank->dbck);
294                 bank->dbck_enabled = false;
295         }
296 }
297 
298 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
299                                                 unsigned trigger)
300 {
301         void __iomem *base = bank->base;
302         u32 gpio_bit = BIT(gpio);
303 
304         omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
305                       trigger & IRQ_TYPE_LEVEL_LOW);
306         omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
307                       trigger & IRQ_TYPE_LEVEL_HIGH);
308         omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
309                       trigger & IRQ_TYPE_EDGE_RISING);
310         omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
311                       trigger & IRQ_TYPE_EDGE_FALLING);
312 
313         bank->context.leveldetect0 =
314                         readl_relaxed(bank->base + bank->regs->leveldetect0);
315         bank->context.leveldetect1 =
316                         readl_relaxed(bank->base + bank->regs->leveldetect1);
317         bank->context.risingdetect =
318                         readl_relaxed(bank->base + bank->regs->risingdetect);
319         bank->context.fallingdetect =
320                         readl_relaxed(bank->base + bank->regs->fallingdetect);
321 
322         if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
323                 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
324                 bank->context.wake_en =
325                         readl_relaxed(bank->base + bank->regs->wkup_en);
326         }
327 
328         /* This part needs to be executed always for OMAP{34xx, 44xx} */
329         if (!bank->regs->irqctrl) {
330                 /* On omap24xx proceed only when valid GPIO bit is set */
331                 if (bank->non_wakeup_gpios) {
332                         if (!(bank->non_wakeup_gpios & gpio_bit))
333                                 goto exit;
334                 }
335 
336                 /*
337                  * Log the edge gpio and manually trigger the IRQ
338                  * after resume if the input level changes
339                  * to avoid irq lost during PER RET/OFF mode
340                  * Applies for omap2 non-wakeup gpio and all omap3 gpios
341                  */
342                 if (trigger & IRQ_TYPE_EDGE_BOTH)
343                         bank->enabled_non_wakeup_gpios |= gpio_bit;
344                 else
345                         bank->enabled_non_wakeup_gpios &= ~gpio_bit;
346         }
347 
348 exit:
349         bank->level_mask =
350                 readl_relaxed(bank->base + bank->regs->leveldetect0) |
351                 readl_relaxed(bank->base + bank->regs->leveldetect1);
352 }
353 
354 #ifdef CONFIG_ARCH_OMAP1
355 /*
356  * This only applies to chips that can't do both rising and falling edge
357  * detection at once.  For all other chips, this function is a noop.
358  */
359 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
360 {
361         void __iomem *reg = bank->base;
362         u32 l = 0;
363 
364         if (!bank->regs->irqctrl)
365                 return;
366 
367         reg += bank->regs->irqctrl;
368 
369         l = readl_relaxed(reg);
370         if ((l >> gpio) & 1)
371                 l &= ~(BIT(gpio));
372         else
373                 l |= BIT(gpio);
374 
375         writel_relaxed(l, reg);
376 }
377 #else
378 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
379 #endif
380 
381 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
382                                     unsigned trigger)
383 {
384         void __iomem *reg = bank->base;
385         void __iomem *base = bank->base;
386         u32 l = 0;
387 
388         if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
389                 omap_set_gpio_trigger(bank, gpio, trigger);
390         } else if (bank->regs->irqctrl) {
391                 reg += bank->regs->irqctrl;
392 
393                 l = readl_relaxed(reg);
394                 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
395                         bank->toggle_mask |= BIT(gpio);
396                 if (trigger & IRQ_TYPE_EDGE_RISING)
397                         l |= BIT(gpio);
398                 else if (trigger & IRQ_TYPE_EDGE_FALLING)
399                         l &= ~(BIT(gpio));
400                 else
401                         return -EINVAL;
402 
403                 writel_relaxed(l, reg);
404         } else if (bank->regs->edgectrl1) {
405                 if (gpio & 0x08)
406                         reg += bank->regs->edgectrl2;
407                 else
408                         reg += bank->regs->edgectrl1;
409 
410                 gpio &= 0x07;
411                 l = readl_relaxed(reg);
412                 l &= ~(3 << (gpio << 1));
413                 if (trigger & IRQ_TYPE_EDGE_RISING)
414                         l |= 2 << (gpio << 1);
415                 if (trigger & IRQ_TYPE_EDGE_FALLING)
416                         l |= BIT(gpio << 1);
417 
418                 /* Enable wake-up during idle for dynamic tick */
419                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
420                 bank->context.wake_en =
421                         readl_relaxed(bank->base + bank->regs->wkup_en);
422                 writel_relaxed(l, reg);
423         }
424         return 0;
425 }
426 
427 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
428 {
429         if (bank->regs->pinctrl) {
430                 void __iomem *reg = bank->base + bank->regs->pinctrl;
431 
432                 /* Claim the pin for MPU */
433                 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
434         }
435 
436         if (bank->regs->ctrl && !BANK_USED(bank)) {
437                 void __iomem *reg = bank->base + bank->regs->ctrl;
438                 u32 ctrl;
439 
440                 ctrl = readl_relaxed(reg);
441                 /* Module is enabled, clocks are not gated */
442                 ctrl &= ~GPIO_MOD_CTRL_BIT;
443                 writel_relaxed(ctrl, reg);
444                 bank->context.ctrl = ctrl;
445         }
446 }
447 
448 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
449 {
450         void __iomem *base = bank->base;
451 
452         if (bank->regs->wkup_en &&
453             !LINE_USED(bank->mod_usage, offset) &&
454             !LINE_USED(bank->irq_usage, offset)) {
455                 /* Disable wake-up during idle for dynamic tick */
456                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
457                 bank->context.wake_en =
458                         readl_relaxed(bank->base + bank->regs->wkup_en);
459         }
460 
461         if (bank->regs->ctrl && !BANK_USED(bank)) {
462                 void __iomem *reg = bank->base + bank->regs->ctrl;
463                 u32 ctrl;
464 
465                 ctrl = readl_relaxed(reg);
466                 /* Module is disabled, clocks are gated */
467                 ctrl |= GPIO_MOD_CTRL_BIT;
468                 writel_relaxed(ctrl, reg);
469                 bank->context.ctrl = ctrl;
470         }
471 }
472 
473 static int omap_gpio_is_input(struct gpio_bank *bank, int mask)
474 {
475         void __iomem *reg = bank->base + bank->regs->direction;
476 
477         return readl_relaxed(reg) & mask;
478 }
479 
480 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
481 {
482         struct gpio_bank *bank = omap_irq_data_get_bank(d);
483         unsigned gpio = 0;
484         int retval;
485         unsigned long flags;
486         unsigned offset;
487 
488         if (!BANK_USED(bank))
489                 pm_runtime_get_sync(bank->dev);
490 
491 #ifdef CONFIG_ARCH_OMAP1
492         if (d->irq > IH_MPUIO_BASE)
493                 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
494 #endif
495 
496         if (!gpio)
497                 gpio = omap_irq_to_gpio(bank, d->hwirq);
498 
499         if (type & ~IRQ_TYPE_SENSE_MASK)
500                 return -EINVAL;
501 
502         if (!bank->regs->leveldetect0 &&
503                 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
504                 return -EINVAL;
505 
506         spin_lock_irqsave(&bank->lock, flags);
507         offset = GPIO_INDEX(bank, gpio);
508         retval = omap_set_gpio_triggering(bank, offset, type);
509         if (!LINE_USED(bank->mod_usage, offset)) {
510                 omap_enable_gpio_module(bank, offset);
511                 omap_set_gpio_direction(bank, offset, 1);
512         } else if (!omap_gpio_is_input(bank, BIT(offset))) {
513                 spin_unlock_irqrestore(&bank->lock, flags);
514                 return -EINVAL;
515         }
516 
517         bank->irq_usage |= BIT(GPIO_INDEX(bank, gpio));
518         spin_unlock_irqrestore(&bank->lock, flags);
519 
520         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
521                 __irq_set_handler_locked(d->irq, handle_level_irq);
522         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
523                 __irq_set_handler_locked(d->irq, handle_edge_irq);
524 
525         return retval;
526 }
527 
528 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
529 {
530         void __iomem *reg = bank->base;
531 
532         reg += bank->regs->irqstatus;
533         writel_relaxed(gpio_mask, reg);
534 
535         /* Workaround for clearing DSP GPIO interrupts to allow retention */
536         if (bank->regs->irqstatus2) {
537                 reg = bank->base + bank->regs->irqstatus2;
538                 writel_relaxed(gpio_mask, reg);
539         }
540 
541         /* Flush posted write for the irq status to avoid spurious interrupts */
542         readl_relaxed(reg);
543 }
544 
545 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
546 {
547         omap_clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
548 }
549 
550 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
551 {
552         void __iomem *reg = bank->base;
553         u32 l;
554         u32 mask = (BIT(bank->width)) - 1;
555 
556         reg += bank->regs->irqenable;
557         l = readl_relaxed(reg);
558         if (bank->regs->irqenable_inv)
559                 l = ~l;
560         l &= mask;
561         return l;
562 }
563 
564 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
565 {
566         void __iomem *reg = bank->base;
567         u32 l;
568 
569         if (bank->regs->set_irqenable) {
570                 reg += bank->regs->set_irqenable;
571                 l = gpio_mask;
572                 bank->context.irqenable1 |= gpio_mask;
573         } else {
574                 reg += bank->regs->irqenable;
575                 l = readl_relaxed(reg);
576                 if (bank->regs->irqenable_inv)
577                         l &= ~gpio_mask;
578                 else
579                         l |= gpio_mask;
580                 bank->context.irqenable1 = l;
581         }
582 
583         writel_relaxed(l, reg);
584 }
585 
586 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
587 {
588         void __iomem *reg = bank->base;
589         u32 l;
590 
591         if (bank->regs->clr_irqenable) {
592                 reg += bank->regs->clr_irqenable;
593                 l = gpio_mask;
594                 bank->context.irqenable1 &= ~gpio_mask;
595         } else {
596                 reg += bank->regs->irqenable;
597                 l = readl_relaxed(reg);
598                 if (bank->regs->irqenable_inv)
599                         l |= gpio_mask;
600                 else
601                         l &= ~gpio_mask;
602                 bank->context.irqenable1 = l;
603         }
604 
605         writel_relaxed(l, reg);
606 }
607 
608 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank, int gpio,
609                                            int enable)
610 {
611         if (enable)
612                 omap_enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
613         else
614                 omap_disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
615 }
616 
617 /*
618  * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
619  * 1510 does not seem to have a wake-up register. If JTAG is connected
620  * to the target, system will wake up always on GPIO events. While
621  * system is running all registered GPIO interrupts need to have wake-up
622  * enabled. When system is suspended, only selected GPIO interrupts need
623  * to have wake-up enabled.
624  */
625 static int omap_set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
626 {
627         u32 gpio_bit = GPIO_BIT(bank, gpio);
628         unsigned long flags;
629 
630         if (bank->non_wakeup_gpios & gpio_bit) {
631                 dev_err(bank->dev,
632                         "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
633                 return -EINVAL;
634         }
635 
636         spin_lock_irqsave(&bank->lock, flags);
637         if (enable)
638                 bank->context.wake_en |= gpio_bit;
639         else
640                 bank->context.wake_en &= ~gpio_bit;
641 
642         writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
643         spin_unlock_irqrestore(&bank->lock, flags);
644 
645         return 0;
646 }
647 
648 static void omap_reset_gpio(struct gpio_bank *bank, int gpio)
649 {
650         omap_set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
651         omap_set_gpio_irqenable(bank, gpio, 0);
652         omap_clear_gpio_irqstatus(bank, gpio);
653         omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
654         omap_clear_gpio_debounce(bank, gpio);
655 }
656 
657 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
658 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
659 {
660         struct gpio_bank *bank = omap_irq_data_get_bank(d);
661         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
662 
663         return omap_set_gpio_wakeup(bank, gpio, enable);
664 }
665 
666 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
667 {
668         struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
669         unsigned long flags;
670 
671         /*
672          * If this is the first gpio_request for the bank,
673          * enable the bank module.
674          */
675         if (!BANK_USED(bank))
676                 pm_runtime_get_sync(bank->dev);
677 
678         spin_lock_irqsave(&bank->lock, flags);
679         /* Set trigger to none. You need to enable the desired trigger with
680          * request_irq() or set_irq_type(). Only do this if the IRQ line has
681          * not already been requested.
682          */
683         if (!LINE_USED(bank->irq_usage, offset)) {
684                 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
685                 omap_enable_gpio_module(bank, offset);
686         }
687         bank->mod_usage |= BIT(offset);
688         spin_unlock_irqrestore(&bank->lock, flags);
689 
690         return 0;
691 }
692 
693 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
694 {
695         struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
696         unsigned long flags;
697 
698         spin_lock_irqsave(&bank->lock, flags);
699         bank->mod_usage &= ~(BIT(offset));
700         omap_disable_gpio_module(bank, offset);
701         omap_reset_gpio(bank, bank->chip.base + offset);
702         spin_unlock_irqrestore(&bank->lock, flags);
703 
704         /*
705          * If this is the last gpio to be freed in the bank,
706          * disable the bank module.
707          */
708         if (!BANK_USED(bank))
709                 pm_runtime_put(bank->dev);
710 }
711 
712 /*
713  * We need to unmask the GPIO bank interrupt as soon as possible to
714  * avoid missing GPIO interrupts for other lines in the bank.
715  * Then we need to mask-read-clear-unmask the triggered GPIO lines
716  * in the bank to avoid missing nested interrupts for a GPIO line.
717  * If we wait to unmask individual GPIO lines in the bank after the
718  * line's interrupt handler has been run, we may miss some nested
719  * interrupts.
720  */
721 static void omap_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
722 {
723         void __iomem *isr_reg = NULL;
724         u32 isr;
725         unsigned int bit;
726         struct gpio_bank *bank;
727         int unmasked = 0;
728         struct irq_chip *irqchip = irq_desc_get_chip(desc);
729         struct gpio_chip *chip = irq_get_handler_data(irq);
730 
731         chained_irq_enter(irqchip, desc);
732 
733         bank = container_of(chip, struct gpio_bank, chip);
734         isr_reg = bank->base + bank->regs->irqstatus;
735         pm_runtime_get_sync(bank->dev);
736 
737         if (WARN_ON(!isr_reg))
738                 goto exit;
739 
740         while (1) {
741                 u32 isr_saved, level_mask = 0;
742                 u32 enabled;
743 
744                 enabled = omap_get_gpio_irqbank_mask(bank);
745                 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
746 
747                 if (bank->level_mask)
748                         level_mask = bank->level_mask & enabled;
749 
750                 /* clear edge sensitive interrupts before handler(s) are
751                 called so that we don't miss any interrupt occurred while
752                 executing them */
753                 omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
754                 omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
755                 omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
756 
757                 /* if there is only edge sensitive GPIO pin interrupts
758                 configured, we could unmask GPIO bank interrupt immediately */
759                 if (!level_mask && !unmasked) {
760                         unmasked = 1;
761                         chained_irq_exit(irqchip, desc);
762                 }
763 
764                 if (!isr)
765                         break;
766 
767                 while (isr) {
768                         bit = __ffs(isr);
769                         isr &= ~(BIT(bit));
770 
771                         /*
772                          * Some chips can't respond to both rising and falling
773                          * at the same time.  If this irq was requested with
774                          * both flags, we need to flip the ICR data for the IRQ
775                          * to respond to the IRQ for the opposite direction.
776                          * This will be indicated in the bank toggle_mask.
777                          */
778                         if (bank->toggle_mask & (BIT(bit)))
779                                 omap_toggle_gpio_edge_triggering(bank, bit);
780 
781                         generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
782                                                             bit));
783                 }
784         }
785         /* if bank has any level sensitive GPIO pin interrupt
786         configured, we must unmask the bank interrupt only after
787         handler(s) are executed in order to avoid spurious bank
788         interrupt */
789 exit:
790         if (!unmasked)
791                 chained_irq_exit(irqchip, desc);
792         pm_runtime_put(bank->dev);
793 }
794 
795 static void omap_gpio_irq_shutdown(struct irq_data *d)
796 {
797         struct gpio_bank *bank = omap_irq_data_get_bank(d);
798         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
799         unsigned long flags;
800         unsigned offset = GPIO_INDEX(bank, gpio);
801 
802         spin_lock_irqsave(&bank->lock, flags);
803         gpio_unlock_as_irq(&bank->chip, offset);
804         bank->irq_usage &= ~(BIT(offset));
805         omap_disable_gpio_module(bank, offset);
806         omap_reset_gpio(bank, gpio);
807         spin_unlock_irqrestore(&bank->lock, flags);
808 
809         /*
810          * If this is the last IRQ to be freed in the bank,
811          * disable the bank module.
812          */
813         if (!BANK_USED(bank))
814                 pm_runtime_put(bank->dev);
815 }
816 
817 static void omap_gpio_ack_irq(struct irq_data *d)
818 {
819         struct gpio_bank *bank = omap_irq_data_get_bank(d);
820         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
821 
822         omap_clear_gpio_irqstatus(bank, gpio);
823 }
824 
825 static void omap_gpio_mask_irq(struct irq_data *d)
826 {
827         struct gpio_bank *bank = omap_irq_data_get_bank(d);
828         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
829         unsigned long flags;
830 
831         spin_lock_irqsave(&bank->lock, flags);
832         omap_set_gpio_irqenable(bank, gpio, 0);
833         omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
834         spin_unlock_irqrestore(&bank->lock, flags);
835 }
836 
837 static void omap_gpio_unmask_irq(struct irq_data *d)
838 {
839         struct gpio_bank *bank = omap_irq_data_get_bank(d);
840         unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
841         unsigned int irq_mask = GPIO_BIT(bank, gpio);
842         u32 trigger = irqd_get_trigger_type(d);
843         unsigned long flags;
844 
845         spin_lock_irqsave(&bank->lock, flags);
846         if (trigger)
847                 omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
848 
849         /* For level-triggered GPIOs, the clearing must be done after
850          * the HW source is cleared, thus after the handler has run */
851         if (bank->level_mask & irq_mask) {
852                 omap_set_gpio_irqenable(bank, gpio, 0);
853                 omap_clear_gpio_irqstatus(bank, gpio);
854         }
855 
856         omap_set_gpio_irqenable(bank, gpio, 1);
857         spin_unlock_irqrestore(&bank->lock, flags);
858 }
859 
860 /*---------------------------------------------------------------------*/
861 
862 static int omap_mpuio_suspend_noirq(struct device *dev)
863 {
864         struct platform_device *pdev = to_platform_device(dev);
865         struct gpio_bank        *bank = platform_get_drvdata(pdev);
866         void __iomem            *mask_reg = bank->base +
867                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
868         unsigned long           flags;
869 
870         spin_lock_irqsave(&bank->lock, flags);
871         writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
872         spin_unlock_irqrestore(&bank->lock, flags);
873 
874         return 0;
875 }
876 
877 static int omap_mpuio_resume_noirq(struct device *dev)
878 {
879         struct platform_device *pdev = to_platform_device(dev);
880         struct gpio_bank        *bank = platform_get_drvdata(pdev);
881         void __iomem            *mask_reg = bank->base +
882                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
883         unsigned long           flags;
884 
885         spin_lock_irqsave(&bank->lock, flags);
886         writel_relaxed(bank->context.wake_en, mask_reg);
887         spin_unlock_irqrestore(&bank->lock, flags);
888 
889         return 0;
890 }
891 
892 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
893         .suspend_noirq = omap_mpuio_suspend_noirq,
894         .resume_noirq = omap_mpuio_resume_noirq,
895 };
896 
897 /* use platform_driver for this. */
898 static struct platform_driver omap_mpuio_driver = {
899         .driver         = {
900                 .name   = "mpuio",
901                 .pm     = &omap_mpuio_dev_pm_ops,
902         },
903 };
904 
905 static struct platform_device omap_mpuio_device = {
906         .name           = "mpuio",
907         .id             = -1,
908         .dev = {
909                 .driver = &omap_mpuio_driver.driver,
910         }
911         /* could list the /proc/iomem resources */
912 };
913 
914 static inline void omap_mpuio_init(struct gpio_bank *bank)
915 {
916         platform_set_drvdata(&omap_mpuio_device, bank);
917 
918         if (platform_driver_register(&omap_mpuio_driver) == 0)
919                 (void) platform_device_register(&omap_mpuio_device);
920 }
921 
922 /*---------------------------------------------------------------------*/
923 
924 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
925 {
926         struct gpio_bank *bank;
927         unsigned long flags;
928         void __iomem *reg;
929         int dir;
930 
931         bank = container_of(chip, struct gpio_bank, chip);
932         reg = bank->base + bank->regs->direction;
933         spin_lock_irqsave(&bank->lock, flags);
934         dir = !!(readl_relaxed(reg) & BIT(offset));
935         spin_unlock_irqrestore(&bank->lock, flags);
936         return dir;
937 }
938 
939 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
940 {
941         struct gpio_bank *bank;
942         unsigned long flags;
943 
944         bank = container_of(chip, struct gpio_bank, chip);
945         spin_lock_irqsave(&bank->lock, flags);
946         omap_set_gpio_direction(bank, offset, 1);
947         spin_unlock_irqrestore(&bank->lock, flags);
948         return 0;
949 }
950 
951 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
952 {
953         struct gpio_bank *bank;
954         u32 mask;
955 
956         bank = container_of(chip, struct gpio_bank, chip);
957         mask = (BIT(offset));
958 
959         if (omap_gpio_is_input(bank, mask))
960                 return omap_get_gpio_datain(bank, offset);
961         else
962                 return omap_get_gpio_dataout(bank, offset);
963 }
964 
965 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
966 {
967         struct gpio_bank *bank;
968         unsigned long flags;
969 
970         bank = container_of(chip, struct gpio_bank, chip);
971         spin_lock_irqsave(&bank->lock, flags);
972         bank->set_dataout(bank, offset, value);
973         omap_set_gpio_direction(bank, offset, 0);
974         spin_unlock_irqrestore(&bank->lock, flags);
975         return 0;
976 }
977 
978 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
979                               unsigned debounce)
980 {
981         struct gpio_bank *bank;
982         unsigned long flags;
983 
984         bank = container_of(chip, struct gpio_bank, chip);
985 
986         spin_lock_irqsave(&bank->lock, flags);
987         omap2_set_gpio_debounce(bank, offset, debounce);
988         spin_unlock_irqrestore(&bank->lock, flags);
989 
990         return 0;
991 }
992 
993 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
994 {
995         struct gpio_bank *bank;
996         unsigned long flags;
997 
998         bank = container_of(chip, struct gpio_bank, chip);
999         spin_lock_irqsave(&bank->lock, flags);
1000         bank->set_dataout(bank, offset, value);
1001         spin_unlock_irqrestore(&bank->lock, flags);
1002 }
1003 
1004 /*---------------------------------------------------------------------*/
1005 
1006 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1007 {
1008         static bool called;
1009         u32 rev;
1010 
1011         if (called || bank->regs->revision == USHRT_MAX)
1012                 return;
1013 
1014         rev = readw_relaxed(bank->base + bank->regs->revision);
1015         pr_info("OMAP GPIO hardware version %d.%d\n",
1016                 (rev >> 4) & 0x0f, rev & 0x0f);
1017 
1018         called = true;
1019 }
1020 
1021 static void omap_gpio_mod_init(struct gpio_bank *bank)
1022 {
1023         void __iomem *base = bank->base;
1024         u32 l = 0xffffffff;
1025 
1026         if (bank->width == 16)
1027                 l = 0xffff;
1028 
1029         if (bank->is_mpuio) {
1030                 writel_relaxed(l, bank->base + bank->regs->irqenable);
1031                 return;
1032         }
1033 
1034         omap_gpio_rmw(base, bank->regs->irqenable, l,
1035                       bank->regs->irqenable_inv);
1036         omap_gpio_rmw(base, bank->regs->irqstatus, l,
1037                       !bank->regs->irqenable_inv);
1038         if (bank->regs->debounce_en)
1039                 writel_relaxed(0, base + bank->regs->debounce_en);
1040 
1041         /* Save OE default value (0xffffffff) in the context */
1042         bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1043          /* Initialize interface clk ungated, module enabled */
1044         if (bank->regs->ctrl)
1045                 writel_relaxed(0, base + bank->regs->ctrl);
1046 
1047         bank->dbck = clk_get(bank->dev, "dbclk");
1048         if (IS_ERR(bank->dbck))
1049                 dev_err(bank->dev, "Could not get gpio dbck\n");
1050 }
1051 
1052 static void
1053 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1054                     unsigned int num)
1055 {
1056         struct irq_chip_generic *gc;
1057         struct irq_chip_type *ct;
1058 
1059         gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1060                                     handle_simple_irq);
1061         if (!gc) {
1062                 dev_err(bank->dev, "Memory alloc failed for gc\n");
1063                 return;
1064         }
1065 
1066         ct = gc->chip_types;
1067 
1068         /* NOTE: No ack required, reading IRQ status clears it. */
1069         ct->chip.irq_mask = irq_gc_mask_set_bit;
1070         ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1071         ct->chip.irq_set_type = omap_gpio_irq_type;
1072 
1073         if (bank->regs->wkup_en)
1074                 ct->chip.irq_set_wake = omap_gpio_wake_enable;
1075 
1076         ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1077         irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1078                                IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1079 }
1080 
1081 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1082 {
1083         int j;
1084         static int gpio;
1085         int irq_base = 0;
1086         int ret;
1087 
1088         /*
1089          * REVISIT eventually switch from OMAP-specific gpio structs
1090          * over to the generic ones
1091          */
1092         bank->chip.request = omap_gpio_request;
1093         bank->chip.free = omap_gpio_free;
1094         bank->chip.get_direction = omap_gpio_get_direction;
1095         bank->chip.direction_input = omap_gpio_input;
1096         bank->chip.get = omap_gpio_get;
1097         bank->chip.direction_output = omap_gpio_output;
1098         bank->chip.set_debounce = omap_gpio_debounce;
1099         bank->chip.set = omap_gpio_set;
1100         if (bank->is_mpuio) {
1101                 bank->chip.label = "mpuio";
1102                 if (bank->regs->wkup_en)
1103                         bank->chip.dev = &omap_mpuio_device.dev;
1104                 bank->chip.base = OMAP_MPUIO(0);
1105         } else {
1106                 bank->chip.label = "gpio";
1107                 bank->chip.base = gpio;
1108                 gpio += bank->width;
1109         }
1110         bank->chip.ngpio = bank->width;
1111 
1112         ret = gpiochip_add(&bank->chip);
1113         if (ret) {
1114                 dev_err(bank->dev, "Could not register gpio chip %d\n", ret);
1115                 return ret;
1116         }
1117 
1118 #ifdef CONFIG_ARCH_OMAP1
1119         /*
1120          * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1121          * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1122          */
1123         irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1124         if (irq_base < 0) {
1125                 dev_err(bank->dev, "Couldn't allocate IRQ numbers\n");
1126                 return -ENODEV;
1127         }
1128 #endif
1129 
1130         ret = gpiochip_irqchip_add(&bank->chip, irqc,
1131                                    irq_base, omap_gpio_irq_handler,
1132                                    IRQ_TYPE_NONE);
1133 
1134         if (ret) {
1135                 dev_err(bank->dev, "Couldn't add irqchip to gpiochip %d\n", ret);
1136                 gpiochip_remove(&bank->chip);
1137                 return -ENODEV;
1138         }
1139 
1140         gpiochip_set_chained_irqchip(&bank->chip, irqc,
1141                                      bank->irq, omap_gpio_irq_handler);
1142 
1143         for (j = 0; j < bank->width; j++) {
1144                 int irq = irq_find_mapping(bank->chip.irqdomain, j);
1145                 if (bank->is_mpuio) {
1146                         omap_mpuio_alloc_gc(bank, irq, bank->width);
1147                         irq_set_chip_and_handler(irq, NULL, NULL);
1148                         set_irq_flags(irq, 0);
1149                 }
1150         }
1151 
1152         return 0;
1153 }
1154 
1155 static const struct of_device_id omap_gpio_match[];
1156 
1157 static int omap_gpio_probe(struct platform_device *pdev)
1158 {
1159         struct device *dev = &pdev->dev;
1160         struct device_node *node = dev->of_node;
1161         const struct of_device_id *match;
1162         const struct omap_gpio_platform_data *pdata;
1163         struct resource *res;
1164         struct gpio_bank *bank;
1165         struct irq_chip *irqc;
1166         int ret;
1167 
1168         match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1169 
1170         pdata = match ? match->data : dev_get_platdata(dev);
1171         if (!pdata)
1172                 return -EINVAL;
1173 
1174         bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1175         if (!bank) {
1176                 dev_err(dev, "Memory alloc failed\n");
1177                 return -ENOMEM;
1178         }
1179 
1180         irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1181         if (!irqc)
1182                 return -ENOMEM;
1183 
1184         irqc->irq_shutdown = omap_gpio_irq_shutdown,
1185         irqc->irq_ack = omap_gpio_ack_irq,
1186         irqc->irq_mask = omap_gpio_mask_irq,
1187         irqc->irq_unmask = omap_gpio_unmask_irq,
1188         irqc->irq_set_type = omap_gpio_irq_type,
1189         irqc->irq_set_wake = omap_gpio_wake_enable,
1190         irqc->name = dev_name(&pdev->dev);
1191 
1192         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1193         if (unlikely(!res)) {
1194                 dev_err(dev, "Invalid IRQ resource\n");
1195                 return -ENODEV;
1196         }
1197 
1198         bank->irq = res->start;
1199         bank->dev = dev;
1200         bank->chip.dev = dev;
1201         bank->dbck_flag = pdata->dbck_flag;
1202         bank->stride = pdata->bank_stride;
1203         bank->width = pdata->bank_width;
1204         bank->is_mpuio = pdata->is_mpuio;
1205         bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1206         bank->regs = pdata->regs;
1207 #ifdef CONFIG_OF_GPIO
1208         bank->chip.of_node = of_node_get(node);
1209 #endif
1210         if (node) {
1211                 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1212                         bank->loses_context = true;
1213         } else {
1214                 bank->loses_context = pdata->loses_context;
1215 
1216                 if (bank->loses_context)
1217                         bank->get_context_loss_count =
1218                                 pdata->get_context_loss_count;
1219         }
1220 
1221         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1222                 bank->set_dataout = omap_set_gpio_dataout_reg;
1223         else
1224                 bank->set_dataout = omap_set_gpio_dataout_mask;
1225 
1226         spin_lock_init(&bank->lock);
1227 
1228         /* Static mapping, never released */
1229         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1230         bank->base = devm_ioremap_resource(dev, res);
1231         if (IS_ERR(bank->base)) {
1232                 irq_domain_remove(bank->chip.irqdomain);
1233                 return PTR_ERR(bank->base);
1234         }
1235 
1236         platform_set_drvdata(pdev, bank);
1237 
1238         pm_runtime_enable(bank->dev);
1239         pm_runtime_irq_safe(bank->dev);
1240         pm_runtime_get_sync(bank->dev);
1241 
1242         if (bank->is_mpuio)
1243                 omap_mpuio_init(bank);
1244 
1245         omap_gpio_mod_init(bank);
1246 
1247         ret = omap_gpio_chip_init(bank, irqc);
1248         if (ret)
1249                 return ret;
1250 
1251         omap_gpio_show_rev(bank);
1252 
1253         pm_runtime_put(bank->dev);
1254 
1255         list_add_tail(&bank->node, &omap_gpio_list);
1256 
1257         return 0;
1258 }
1259 
1260 #ifdef CONFIG_ARCH_OMAP2PLUS
1261 
1262 #if defined(CONFIG_PM_RUNTIME)
1263 static void omap_gpio_restore_context(struct gpio_bank *bank);
1264 
1265 static int omap_gpio_runtime_suspend(struct device *dev)
1266 {
1267         struct platform_device *pdev = to_platform_device(dev);
1268         struct gpio_bank *bank = platform_get_drvdata(pdev);
1269         u32 l1 = 0, l2 = 0;
1270         unsigned long flags;
1271         u32 wake_low, wake_hi;
1272 
1273         spin_lock_irqsave(&bank->lock, flags);
1274 
1275         /*
1276          * Only edges can generate a wakeup event to the PRCM.
1277          *
1278          * Therefore, ensure any wake-up capable GPIOs have
1279          * edge-detection enabled before going idle to ensure a wakeup
1280          * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1281          * NDA TRM 25.5.3.1)
1282          *
1283          * The normal values will be restored upon ->runtime_resume()
1284          * by writing back the values saved in bank->context.
1285          */
1286         wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1287         if (wake_low)
1288                 writel_relaxed(wake_low | bank->context.fallingdetect,
1289                              bank->base + bank->regs->fallingdetect);
1290         wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1291         if (wake_hi)
1292                 writel_relaxed(wake_hi | bank->context.risingdetect,
1293                              bank->base + bank->regs->risingdetect);
1294 
1295         if (!bank->enabled_non_wakeup_gpios)
1296                 goto update_gpio_context_count;
1297 
1298         if (bank->power_mode != OFF_MODE) {
1299                 bank->power_mode = 0;
1300                 goto update_gpio_context_count;
1301         }
1302         /*
1303          * If going to OFF, remove triggering for all
1304          * non-wakeup GPIOs.  Otherwise spurious IRQs will be
1305          * generated.  See OMAP2420 Errata item 1.101.
1306          */
1307         bank->saved_datain = readl_relaxed(bank->base +
1308                                                 bank->regs->datain);
1309         l1 = bank->context.fallingdetect;
1310         l2 = bank->context.risingdetect;
1311 
1312         l1 &= ~bank->enabled_non_wakeup_gpios;
1313         l2 &= ~bank->enabled_non_wakeup_gpios;
1314 
1315         writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1316         writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1317 
1318         bank->workaround_enabled = true;
1319 
1320 update_gpio_context_count:
1321         if (bank->get_context_loss_count)
1322                 bank->context_loss_count =
1323                                 bank->get_context_loss_count(bank->dev);
1324 
1325         omap_gpio_dbck_disable(bank);
1326         spin_unlock_irqrestore(&bank->lock, flags);
1327 
1328         return 0;
1329 }
1330 
1331 static void omap_gpio_init_context(struct gpio_bank *p);
1332 
1333 static int omap_gpio_runtime_resume(struct device *dev)
1334 {
1335         struct platform_device *pdev = to_platform_device(dev);
1336         struct gpio_bank *bank = platform_get_drvdata(pdev);
1337         u32 l = 0, gen, gen0, gen1;
1338         unsigned long flags;
1339         int c;
1340 
1341         spin_lock_irqsave(&bank->lock, flags);
1342 
1343         /*
1344          * On the first resume during the probe, the context has not
1345          * been initialised and so initialise it now. Also initialise
1346          * the context loss count.
1347          */
1348         if (bank->loses_context && !bank->context_valid) {
1349                 omap_gpio_init_context(bank);
1350 
1351                 if (bank->get_context_loss_count)
1352                         bank->context_loss_count =
1353                                 bank->get_context_loss_count(bank->dev);
1354         }
1355 
1356         omap_gpio_dbck_enable(bank);
1357 
1358         /*
1359          * In ->runtime_suspend(), level-triggered, wakeup-enabled
1360          * GPIOs were set to edge trigger also in order to be able to
1361          * generate a PRCM wakeup.  Here we restore the
1362          * pre-runtime_suspend() values for edge triggering.
1363          */
1364         writel_relaxed(bank->context.fallingdetect,
1365                      bank->base + bank->regs->fallingdetect);
1366         writel_relaxed(bank->context.risingdetect,
1367                      bank->base + bank->regs->risingdetect);
1368 
1369         if (bank->loses_context) {
1370                 if (!bank->get_context_loss_count) {
1371                         omap_gpio_restore_context(bank);
1372                 } else {
1373                         c = bank->get_context_loss_count(bank->dev);
1374                         if (c != bank->context_loss_count) {
1375                                 omap_gpio_restore_context(bank);
1376                         } else {
1377                                 spin_unlock_irqrestore(&bank->lock, flags);
1378                                 return 0;
1379                         }
1380                 }
1381         }
1382 
1383         if (!bank->workaround_enabled) {
1384                 spin_unlock_irqrestore(&bank->lock, flags);
1385                 return 0;
1386         }
1387 
1388         l = readl_relaxed(bank->base + bank->regs->datain);
1389 
1390         /*
1391          * Check if any of the non-wakeup interrupt GPIOs have changed
1392          * state.  If so, generate an IRQ by software.  This is
1393          * horribly racy, but it's the best we can do to work around
1394          * this silicon bug.
1395          */
1396         l ^= bank->saved_datain;
1397         l &= bank->enabled_non_wakeup_gpios;
1398 
1399         /*
1400          * No need to generate IRQs for the rising edge for gpio IRQs
1401          * configured with falling edge only; and vice versa.
1402          */
1403         gen0 = l & bank->context.fallingdetect;
1404         gen0 &= bank->saved_datain;
1405 
1406         gen1 = l & bank->context.risingdetect;
1407         gen1 &= ~(bank->saved_datain);
1408 
1409         /* FIXME: Consider GPIO IRQs with level detections properly! */
1410         gen = l & (~(bank->context.fallingdetect) &
1411                                          ~(bank->context.risingdetect));
1412         /* Consider all GPIO IRQs needed to be updated */
1413         gen |= gen0 | gen1;
1414 
1415         if (gen) {
1416                 u32 old0, old1;
1417 
1418                 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1419                 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1420 
1421                 if (!bank->regs->irqstatus_raw0) {
1422                         writel_relaxed(old0 | gen, bank->base +
1423                                                 bank->regs->leveldetect0);
1424                         writel_relaxed(old1 | gen, bank->base +
1425                                                 bank->regs->leveldetect1);
1426                 }
1427 
1428                 if (bank->regs->irqstatus_raw0) {
1429                         writel_relaxed(old0 | l, bank->base +
1430                                                 bank->regs->leveldetect0);
1431                         writel_relaxed(old1 | l, bank->base +
1432                                                 bank->regs->leveldetect1);
1433                 }
1434                 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1435                 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1436         }
1437 
1438         bank->workaround_enabled = false;
1439         spin_unlock_irqrestore(&bank->lock, flags);
1440 
1441         return 0;
1442 }
1443 #endif /* CONFIG_PM_RUNTIME */
1444 
1445 void omap2_gpio_prepare_for_idle(int pwr_mode)
1446 {
1447         struct gpio_bank *bank;
1448 
1449         list_for_each_entry(bank, &omap_gpio_list, node) {
1450                 if (!BANK_USED(bank) || !bank->loses_context)
1451                         continue;
1452 
1453                 bank->power_mode = pwr_mode;
1454 
1455                 pm_runtime_put_sync_suspend(bank->dev);
1456         }
1457 }
1458 
1459 void omap2_gpio_resume_after_idle(void)
1460 {
1461         struct gpio_bank *bank;
1462 
1463         list_for_each_entry(bank, &omap_gpio_list, node) {
1464                 if (!BANK_USED(bank) || !bank->loses_context)
1465                         continue;
1466 
1467                 pm_runtime_get_sync(bank->dev);
1468         }
1469 }
1470 
1471 #if defined(CONFIG_PM_RUNTIME)
1472 static void omap_gpio_init_context(struct gpio_bank *p)
1473 {
1474         struct omap_gpio_reg_offs *regs = p->regs;
1475         void __iomem *base = p->base;
1476 
1477         p->context.ctrl         = readl_relaxed(base + regs->ctrl);
1478         p->context.oe           = readl_relaxed(base + regs->direction);
1479         p->context.wake_en      = readl_relaxed(base + regs->wkup_en);
1480         p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1481         p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1482         p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1483         p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1484         p->context.irqenable1   = readl_relaxed(base + regs->irqenable);
1485         p->context.irqenable2   = readl_relaxed(base + regs->irqenable2);
1486 
1487         if (regs->set_dataout && p->regs->clr_dataout)
1488                 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1489         else
1490                 p->context.dataout = readl_relaxed(base + regs->dataout);
1491 
1492         p->context_valid = true;
1493 }
1494 
1495 static void omap_gpio_restore_context(struct gpio_bank *bank)
1496 {
1497         writel_relaxed(bank->context.wake_en,
1498                                 bank->base + bank->regs->wkup_en);
1499         writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1500         writel_relaxed(bank->context.leveldetect0,
1501                                 bank->base + bank->regs->leveldetect0);
1502         writel_relaxed(bank->context.leveldetect1,
1503                                 bank->base + bank->regs->leveldetect1);
1504         writel_relaxed(bank->context.risingdetect,
1505                                 bank->base + bank->regs->risingdetect);
1506         writel_relaxed(bank->context.fallingdetect,
1507                                 bank->base + bank->regs->fallingdetect);
1508         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1509                 writel_relaxed(bank->context.dataout,
1510                                 bank->base + bank->regs->set_dataout);
1511         else
1512                 writel_relaxed(bank->context.dataout,
1513                                 bank->base + bank->regs->dataout);
1514         writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1515 
1516         if (bank->dbck_enable_mask) {
1517                 writel_relaxed(bank->context.debounce, bank->base +
1518                                         bank->regs->debounce);
1519                 writel_relaxed(bank->context.debounce_en,
1520                                         bank->base + bank->regs->debounce_en);
1521         }
1522 
1523         writel_relaxed(bank->context.irqenable1,
1524                                 bank->base + bank->regs->irqenable);
1525         writel_relaxed(bank->context.irqenable2,
1526                                 bank->base + bank->regs->irqenable2);
1527 }
1528 #endif /* CONFIG_PM_RUNTIME */
1529 #else
1530 #define omap_gpio_runtime_suspend NULL
1531 #define omap_gpio_runtime_resume NULL
1532 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1533 #endif
1534 
1535 static const struct dev_pm_ops gpio_pm_ops = {
1536         SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1537                                                                         NULL)
1538 };
1539 
1540 #if defined(CONFIG_OF)
1541 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1542         .revision =             OMAP24XX_GPIO_REVISION,
1543         .direction =            OMAP24XX_GPIO_OE,
1544         .datain =               OMAP24XX_GPIO_DATAIN,
1545         .dataout =              OMAP24XX_GPIO_DATAOUT,
1546         .set_dataout =          OMAP24XX_GPIO_SETDATAOUT,
1547         .clr_dataout =          OMAP24XX_GPIO_CLEARDATAOUT,
1548         .irqstatus =            OMAP24XX_GPIO_IRQSTATUS1,
1549         .irqstatus2 =           OMAP24XX_GPIO_IRQSTATUS2,
1550         .irqenable =            OMAP24XX_GPIO_IRQENABLE1,
1551         .irqenable2 =           OMAP24XX_GPIO_IRQENABLE2,
1552         .set_irqenable =        OMAP24XX_GPIO_SETIRQENABLE1,
1553         .clr_irqenable =        OMAP24XX_GPIO_CLEARIRQENABLE1,
1554         .debounce =             OMAP24XX_GPIO_DEBOUNCE_VAL,
1555         .debounce_en =          OMAP24XX_GPIO_DEBOUNCE_EN,
1556         .ctrl =                 OMAP24XX_GPIO_CTRL,
1557         .wkup_en =              OMAP24XX_GPIO_WAKE_EN,
1558         .leveldetect0 =         OMAP24XX_GPIO_LEVELDETECT0,
1559         .leveldetect1 =         OMAP24XX_GPIO_LEVELDETECT1,
1560         .risingdetect =         OMAP24XX_GPIO_RISINGDETECT,
1561         .fallingdetect =        OMAP24XX_GPIO_FALLINGDETECT,
1562 };
1563 
1564 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1565         .revision =             OMAP4_GPIO_REVISION,
1566         .direction =            OMAP4_GPIO_OE,
1567         .datain =               OMAP4_GPIO_DATAIN,
1568         .dataout =              OMAP4_GPIO_DATAOUT,
1569         .set_dataout =          OMAP4_GPIO_SETDATAOUT,
1570         .clr_dataout =          OMAP4_GPIO_CLEARDATAOUT,
1571         .irqstatus =            OMAP4_GPIO_IRQSTATUS0,
1572         .irqstatus2 =           OMAP4_GPIO_IRQSTATUS1,
1573         .irqenable =            OMAP4_GPIO_IRQSTATUSSET0,
1574         .irqenable2 =           OMAP4_GPIO_IRQSTATUSSET1,
1575         .set_irqenable =        OMAP4_GPIO_IRQSTATUSSET0,
1576         .clr_irqenable =        OMAP4_GPIO_IRQSTATUSCLR0,
1577         .debounce =             OMAP4_GPIO_DEBOUNCINGTIME,
1578         .debounce_en =          OMAP4_GPIO_DEBOUNCENABLE,
1579         .ctrl =                 OMAP4_GPIO_CTRL,
1580         .wkup_en =              OMAP4_GPIO_IRQWAKEN0,
1581         .leveldetect0 =         OMAP4_GPIO_LEVELDETECT0,
1582         .leveldetect1 =         OMAP4_GPIO_LEVELDETECT1,
1583         .risingdetect =         OMAP4_GPIO_RISINGDETECT,
1584         .fallingdetect =        OMAP4_GPIO_FALLINGDETECT,
1585 };
1586 
1587 static const struct omap_gpio_platform_data omap2_pdata = {
1588         .regs = &omap2_gpio_regs,
1589         .bank_width = 32,
1590         .dbck_flag = false,
1591 };
1592 
1593 static const struct omap_gpio_platform_data omap3_pdata = {
1594         .regs = &omap2_gpio_regs,
1595         .bank_width = 32,
1596         .dbck_flag = true,
1597 };
1598 
1599 static const struct omap_gpio_platform_data omap4_pdata = {
1600         .regs = &omap4_gpio_regs,
1601         .bank_width = 32,
1602         .dbck_flag = true,
1603 };
1604 
1605 static const struct of_device_id omap_gpio_match[] = {
1606         {
1607                 .compatible = "ti,omap4-gpio",
1608                 .data = &omap4_pdata,
1609         },
1610         {
1611                 .compatible = "ti,omap3-gpio",
1612                 .data = &omap3_pdata,
1613         },
1614         {
1615                 .compatible = "ti,omap2-gpio",
1616                 .data = &omap2_pdata,
1617         },
1618         { },
1619 };
1620 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1621 #endif
1622 
1623 static struct platform_driver omap_gpio_driver = {
1624         .probe          = omap_gpio_probe,
1625         .driver         = {
1626                 .name   = "omap_gpio",
1627                 .pm     = &gpio_pm_ops,
1628                 .of_match_table = of_match_ptr(omap_gpio_match),
1629         },
1630 };
1631 
1632 /*
1633  * gpio driver register needs to be done before
1634  * machine_init functions access gpio APIs.
1635  * Hence omap_gpio_drv_reg() is a postcore_initcall.
1636  */
1637 static int __init omap_gpio_drv_reg(void)
1638 {
1639         return platform_driver_register(&omap_gpio_driver);
1640 }
1641 postcore_initcall(omap_gpio_drv_reg);
1642 

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