]> git.kernelconcepts.de Git - karo-tx-linux.git/blob - drivers/gpio/gpio-omap.c
KVM: svm: handle KVM_X86_QUIRK_CD_NW_CLEARED in svm_get_mt_mask
[karo-tx-linux.git] / drivers / gpio / gpio-omap.c
1 /*
2  * Support functions for OMAP GPIO
3  *
4  * Copyright (C) 2003-2005 Nokia Corporation
5  * Written by Juha Yrjölä <juha.yrjola@nokia.com>
6  *
7  * Copyright (C) 2009 Texas Instruments
8  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/syscore_ops.h>
19 #include <linux/err.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22 #include <linux/device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/pm.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/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, unsigned 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_MOD_CTRL_BIT       BIT(0)
85
86 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
87 #define LINE_USED(line, offset) (line & (BIT(offset)))
88
89 static void omap_gpio_unmask_irq(struct irq_data *d);
90
91 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
92 {
93         struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
94         return container_of(chip, struct gpio_bank, chip);
95 }
96
97 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
98                                     int is_input)
99 {
100         void __iomem *reg = bank->base;
101         u32 l;
102
103         reg += bank->regs->direction;
104         l = readl_relaxed(reg);
105         if (is_input)
106                 l |= BIT(gpio);
107         else
108                 l &= ~(BIT(gpio));
109         writel_relaxed(l, reg);
110         bank->context.oe = l;
111 }
112
113
114 /* set data out value using dedicate set/clear register */
115 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
116                                       int enable)
117 {
118         void __iomem *reg = bank->base;
119         u32 l = BIT(offset);
120
121         if (enable) {
122                 reg += bank->regs->set_dataout;
123                 bank->context.dataout |= l;
124         } else {
125                 reg += bank->regs->clr_dataout;
126                 bank->context.dataout &= ~l;
127         }
128
129         writel_relaxed(l, reg);
130 }
131
132 /* set data out value using mask register */
133 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
134                                        int enable)
135 {
136         void __iomem *reg = bank->base + bank->regs->dataout;
137         u32 gpio_bit = BIT(offset);
138         u32 l;
139
140         l = readl_relaxed(reg);
141         if (enable)
142                 l |= gpio_bit;
143         else
144                 l &= ~gpio_bit;
145         writel_relaxed(l, reg);
146         bank->context.dataout = l;
147 }
148
149 static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
150 {
151         void __iomem *reg = bank->base + bank->regs->datain;
152
153         return (readl_relaxed(reg) & (BIT(offset))) != 0;
154 }
155
156 static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
157 {
158         void __iomem *reg = bank->base + bank->regs->dataout;
159
160         return (readl_relaxed(reg) & (BIT(offset))) != 0;
161 }
162
163 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
164 {
165         int l = readl_relaxed(base + reg);
166
167         if (set)
168                 l |= mask;
169         else
170                 l &= ~mask;
171
172         writel_relaxed(l, base + reg);
173 }
174
175 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
176 {
177         if (bank->dbck_enable_mask && !bank->dbck_enabled) {
178                 clk_prepare_enable(bank->dbck);
179                 bank->dbck_enabled = true;
180
181                 writel_relaxed(bank->dbck_enable_mask,
182                              bank->base + bank->regs->debounce_en);
183         }
184 }
185
186 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
187 {
188         if (bank->dbck_enable_mask && bank->dbck_enabled) {
189                 /*
190                  * Disable debounce before cutting it's clock. If debounce is
191                  * enabled but the clock is not, GPIO module seems to be unable
192                  * to detect events and generate interrupts at least on OMAP3.
193                  */
194                 writel_relaxed(0, bank->base + bank->regs->debounce_en);
195
196                 clk_disable_unprepare(bank->dbck);
197                 bank->dbck_enabled = false;
198         }
199 }
200
201 /**
202  * omap2_set_gpio_debounce - low level gpio debounce time
203  * @bank: the gpio bank we're acting upon
204  * @offset: the gpio number on this @bank
205  * @debounce: debounce time to use
206  *
207  * OMAP's debounce time is in 31us steps so we need
208  * to convert and round up to the closest unit.
209  */
210 static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
211                                     unsigned debounce)
212 {
213         void __iomem            *reg;
214         u32                     val;
215         u32                     l;
216
217         if (!bank->dbck_flag)
218                 return;
219
220         if (debounce < 32)
221                 debounce = 0x01;
222         else if (debounce > 7936)
223                 debounce = 0xff;
224         else
225                 debounce = (debounce / 0x1f) - 1;
226
227         l = BIT(offset);
228
229         clk_prepare_enable(bank->dbck);
230         reg = bank->base + bank->regs->debounce;
231         writel_relaxed(debounce, reg);
232
233         reg = bank->base + bank->regs->debounce_en;
234         val = readl_relaxed(reg);
235
236         if (debounce)
237                 val |= l;
238         else
239                 val &= ~l;
240         bank->dbck_enable_mask = val;
241
242         writel_relaxed(val, reg);
243         clk_disable_unprepare(bank->dbck);
244         /*
245          * Enable debounce clock per module.
246          * This call is mandatory because in omap_gpio_request() when
247          * *_runtime_get_sync() is called,  _gpio_dbck_enable() within
248          * runtime callbck fails to turn on dbck because dbck_enable_mask
249          * used within _gpio_dbck_enable() is still not initialized at
250          * that point. Therefore we have to enable dbck here.
251          */
252         omap_gpio_dbck_enable(bank);
253         if (bank->dbck_enable_mask) {
254                 bank->context.debounce = debounce;
255                 bank->context.debounce_en = val;
256         }
257 }
258
259 /**
260  * omap_clear_gpio_debounce - clear debounce settings for a gpio
261  * @bank: the gpio bank we're acting upon
262  * @offset: the gpio number on this @bank
263  *
264  * If a gpio is using debounce, then clear the debounce enable bit and if
265  * this is the only gpio in this bank using debounce, then clear the debounce
266  * time too. The debounce clock will also be disabled when calling this function
267  * if this is the only gpio in the bank using debounce.
268  */
269 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
270 {
271         u32 gpio_bit = BIT(offset);
272
273         if (!bank->dbck_flag)
274                 return;
275
276         if (!(bank->dbck_enable_mask & gpio_bit))
277                 return;
278
279         bank->dbck_enable_mask &= ~gpio_bit;
280         bank->context.debounce_en &= ~gpio_bit;
281         writel_relaxed(bank->context.debounce_en,
282                      bank->base + bank->regs->debounce_en);
283
284         if (!bank->dbck_enable_mask) {
285                 bank->context.debounce = 0;
286                 writel_relaxed(bank->context.debounce, bank->base +
287                              bank->regs->debounce);
288                 clk_disable_unprepare(bank->dbck);
289                 bank->dbck_enabled = false;
290         }
291 }
292
293 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
294                                                 unsigned trigger)
295 {
296         void __iomem *base = bank->base;
297         u32 gpio_bit = BIT(gpio);
298
299         omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
300                       trigger & IRQ_TYPE_LEVEL_LOW);
301         omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
302                       trigger & IRQ_TYPE_LEVEL_HIGH);
303         omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
304                       trigger & IRQ_TYPE_EDGE_RISING);
305         omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
306                       trigger & IRQ_TYPE_EDGE_FALLING);
307
308         bank->context.leveldetect0 =
309                         readl_relaxed(bank->base + bank->regs->leveldetect0);
310         bank->context.leveldetect1 =
311                         readl_relaxed(bank->base + bank->regs->leveldetect1);
312         bank->context.risingdetect =
313                         readl_relaxed(bank->base + bank->regs->risingdetect);
314         bank->context.fallingdetect =
315                         readl_relaxed(bank->base + bank->regs->fallingdetect);
316
317         if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
318                 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
319                 bank->context.wake_en =
320                         readl_relaxed(bank->base + bank->regs->wkup_en);
321         }
322
323         /* This part needs to be executed always for OMAP{34xx, 44xx} */
324         if (!bank->regs->irqctrl) {
325                 /* On omap24xx proceed only when valid GPIO bit is set */
326                 if (bank->non_wakeup_gpios) {
327                         if (!(bank->non_wakeup_gpios & gpio_bit))
328                                 goto exit;
329                 }
330
331                 /*
332                  * Log the edge gpio and manually trigger the IRQ
333                  * after resume if the input level changes
334                  * to avoid irq lost during PER RET/OFF mode
335                  * Applies for omap2 non-wakeup gpio and all omap3 gpios
336                  */
337                 if (trigger & IRQ_TYPE_EDGE_BOTH)
338                         bank->enabled_non_wakeup_gpios |= gpio_bit;
339                 else
340                         bank->enabled_non_wakeup_gpios &= ~gpio_bit;
341         }
342
343 exit:
344         bank->level_mask =
345                 readl_relaxed(bank->base + bank->regs->leveldetect0) |
346                 readl_relaxed(bank->base + bank->regs->leveldetect1);
347 }
348
349 #ifdef CONFIG_ARCH_OMAP1
350 /*
351  * This only applies to chips that can't do both rising and falling edge
352  * detection at once.  For all other chips, this function is a noop.
353  */
354 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
355 {
356         void __iomem *reg = bank->base;
357         u32 l = 0;
358
359         if (!bank->regs->irqctrl)
360                 return;
361
362         reg += bank->regs->irqctrl;
363
364         l = readl_relaxed(reg);
365         if ((l >> gpio) & 1)
366                 l &= ~(BIT(gpio));
367         else
368                 l |= BIT(gpio);
369
370         writel_relaxed(l, reg);
371 }
372 #else
373 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
374 #endif
375
376 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
377                                     unsigned trigger)
378 {
379         void __iomem *reg = bank->base;
380         void __iomem *base = bank->base;
381         u32 l = 0;
382
383         if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
384                 omap_set_gpio_trigger(bank, gpio, trigger);
385         } else if (bank->regs->irqctrl) {
386                 reg += bank->regs->irqctrl;
387
388                 l = readl_relaxed(reg);
389                 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
390                         bank->toggle_mask |= BIT(gpio);
391                 if (trigger & IRQ_TYPE_EDGE_RISING)
392                         l |= BIT(gpio);
393                 else if (trigger & IRQ_TYPE_EDGE_FALLING)
394                         l &= ~(BIT(gpio));
395                 else
396                         return -EINVAL;
397
398                 writel_relaxed(l, reg);
399         } else if (bank->regs->edgectrl1) {
400                 if (gpio & 0x08)
401                         reg += bank->regs->edgectrl2;
402                 else
403                         reg += bank->regs->edgectrl1;
404
405                 gpio &= 0x07;
406                 l = readl_relaxed(reg);
407                 l &= ~(3 << (gpio << 1));
408                 if (trigger & IRQ_TYPE_EDGE_RISING)
409                         l |= 2 << (gpio << 1);
410                 if (trigger & IRQ_TYPE_EDGE_FALLING)
411                         l |= BIT(gpio << 1);
412
413                 /* Enable wake-up during idle for dynamic tick */
414                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
415                 bank->context.wake_en =
416                         readl_relaxed(bank->base + bank->regs->wkup_en);
417                 writel_relaxed(l, reg);
418         }
419         return 0;
420 }
421
422 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
423 {
424         if (bank->regs->pinctrl) {
425                 void __iomem *reg = bank->base + bank->regs->pinctrl;
426
427                 /* Claim the pin for MPU */
428                 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
429         }
430
431         if (bank->regs->ctrl && !BANK_USED(bank)) {
432                 void __iomem *reg = bank->base + bank->regs->ctrl;
433                 u32 ctrl;
434
435                 ctrl = readl_relaxed(reg);
436                 /* Module is enabled, clocks are not gated */
437                 ctrl &= ~GPIO_MOD_CTRL_BIT;
438                 writel_relaxed(ctrl, reg);
439                 bank->context.ctrl = ctrl;
440         }
441 }
442
443 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
444 {
445         void __iomem *base = bank->base;
446
447         if (bank->regs->wkup_en &&
448             !LINE_USED(bank->mod_usage, offset) &&
449             !LINE_USED(bank->irq_usage, offset)) {
450                 /* Disable wake-up during idle for dynamic tick */
451                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
452                 bank->context.wake_en =
453                         readl_relaxed(bank->base + bank->regs->wkup_en);
454         }
455
456         if (bank->regs->ctrl && !BANK_USED(bank)) {
457                 void __iomem *reg = bank->base + bank->regs->ctrl;
458                 u32 ctrl;
459
460                 ctrl = readl_relaxed(reg);
461                 /* Module is disabled, clocks are gated */
462                 ctrl |= GPIO_MOD_CTRL_BIT;
463                 writel_relaxed(ctrl, reg);
464                 bank->context.ctrl = ctrl;
465         }
466 }
467
468 static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
469 {
470         void __iomem *reg = bank->base + bank->regs->direction;
471
472         return readl_relaxed(reg) & BIT(offset);
473 }
474
475 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
476 {
477         if (!LINE_USED(bank->mod_usage, offset)) {
478                 omap_enable_gpio_module(bank, offset);
479                 omap_set_gpio_direction(bank, offset, 1);
480         }
481         bank->irq_usage |= BIT(offset);
482 }
483
484 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
485 {
486         struct gpio_bank *bank = omap_irq_data_get_bank(d);
487         int retval;
488         unsigned long flags;
489         unsigned offset = d->hwirq;
490
491         if (type & ~IRQ_TYPE_SENSE_MASK)
492                 return -EINVAL;
493
494         if (!bank->regs->leveldetect0 &&
495                 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
496                 return -EINVAL;
497
498         if (!BANK_USED(bank))
499                 pm_runtime_get_sync(bank->dev);
500
501         spin_lock_irqsave(&bank->lock, flags);
502         retval = omap_set_gpio_triggering(bank, offset, type);
503         if (retval) {
504                 spin_unlock_irqrestore(&bank->lock, flags);
505                 goto error;
506         }
507         omap_gpio_init_irq(bank, offset);
508         if (!omap_gpio_is_input(bank, offset)) {
509                 spin_unlock_irqrestore(&bank->lock, flags);
510                 retval = -EINVAL;
511                 goto error;
512         }
513         spin_unlock_irqrestore(&bank->lock, flags);
514
515         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
516                 __irq_set_handler_locked(d->irq, handle_level_irq);
517         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
518                 __irq_set_handler_locked(d->irq, handle_edge_irq);
519
520         return 0;
521
522 error:
523         if (!BANK_USED(bank))
524                 pm_runtime_put(bank->dev);
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,
546                                              unsigned offset)
547 {
548         omap_clear_gpio_irqbank(bank, BIT(offset));
549 }
550
551 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
552 {
553         void __iomem *reg = bank->base;
554         u32 l;
555         u32 mask = (BIT(bank->width)) - 1;
556
557         reg += bank->regs->irqenable;
558         l = readl_relaxed(reg);
559         if (bank->regs->irqenable_inv)
560                 l = ~l;
561         l &= mask;
562         return l;
563 }
564
565 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
566 {
567         void __iomem *reg = bank->base;
568         u32 l;
569
570         if (bank->regs->set_irqenable) {
571                 reg += bank->regs->set_irqenable;
572                 l = gpio_mask;
573                 bank->context.irqenable1 |= gpio_mask;
574         } else {
575                 reg += bank->regs->irqenable;
576                 l = readl_relaxed(reg);
577                 if (bank->regs->irqenable_inv)
578                         l &= ~gpio_mask;
579                 else
580                         l |= gpio_mask;
581                 bank->context.irqenable1 = l;
582         }
583
584         writel_relaxed(l, reg);
585 }
586
587 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
588 {
589         void __iomem *reg = bank->base;
590         u32 l;
591
592         if (bank->regs->clr_irqenable) {
593                 reg += bank->regs->clr_irqenable;
594                 l = gpio_mask;
595                 bank->context.irqenable1 &= ~gpio_mask;
596         } else {
597                 reg += bank->regs->irqenable;
598                 l = readl_relaxed(reg);
599                 if (bank->regs->irqenable_inv)
600                         l |= gpio_mask;
601                 else
602                         l &= ~gpio_mask;
603                 bank->context.irqenable1 = l;
604         }
605
606         writel_relaxed(l, reg);
607 }
608
609 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
610                                            unsigned offset, int enable)
611 {
612         if (enable)
613                 omap_enable_gpio_irqbank(bank, BIT(offset));
614         else
615                 omap_disable_gpio_irqbank(bank, BIT(offset));
616 }
617
618 /*
619  * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
620  * 1510 does not seem to have a wake-up register. If JTAG is connected
621  * to the target, system will wake up always on GPIO events. While
622  * system is running all registered GPIO interrupts need to have wake-up
623  * enabled. When system is suspended, only selected GPIO interrupts need
624  * to have wake-up enabled.
625  */
626 static int omap_set_gpio_wakeup(struct gpio_bank *bank, unsigned offset,
627                                 int enable)
628 {
629         u32 gpio_bit = BIT(offset);
630         unsigned long flags;
631
632         if (bank->non_wakeup_gpios & gpio_bit) {
633                 dev_err(bank->dev,
634                         "Unable to modify wakeup on non-wakeup GPIO%d\n",
635                         offset);
636                 return -EINVAL;
637         }
638
639         spin_lock_irqsave(&bank->lock, flags);
640         if (enable)
641                 bank->context.wake_en |= gpio_bit;
642         else
643                 bank->context.wake_en &= ~gpio_bit;
644
645         writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
646         spin_unlock_irqrestore(&bank->lock, flags);
647
648         return 0;
649 }
650
651 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
652 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
653 {
654         struct gpio_bank *bank = omap_irq_data_get_bank(d);
655         unsigned offset = d->hwirq;
656
657         return omap_set_gpio_wakeup(bank, offset, enable);
658 }
659
660 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
661 {
662         struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
663         unsigned long flags;
664
665         /*
666          * If this is the first gpio_request for the bank,
667          * enable the bank module.
668          */
669         if (!BANK_USED(bank))
670                 pm_runtime_get_sync(bank->dev);
671
672         spin_lock_irqsave(&bank->lock, flags);
673         omap_enable_gpio_module(bank, offset);
674         bank->mod_usage |= BIT(offset);
675         spin_unlock_irqrestore(&bank->lock, flags);
676
677         return 0;
678 }
679
680 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
681 {
682         struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
683         unsigned long flags;
684
685         spin_lock_irqsave(&bank->lock, flags);
686         bank->mod_usage &= ~(BIT(offset));
687         if (!LINE_USED(bank->irq_usage, offset)) {
688                 omap_set_gpio_direction(bank, offset, 1);
689                 omap_clear_gpio_debounce(bank, offset);
690         }
691         omap_disable_gpio_module(bank, offset);
692         spin_unlock_irqrestore(&bank->lock, flags);
693
694         /*
695          * If this is the last gpio to be freed in the bank,
696          * disable the bank module.
697          */
698         if (!BANK_USED(bank))
699                 pm_runtime_put(bank->dev);
700 }
701
702 /*
703  * We need to unmask the GPIO bank interrupt as soon as possible to
704  * avoid missing GPIO interrupts for other lines in the bank.
705  * Then we need to mask-read-clear-unmask the triggered GPIO lines
706  * in the bank to avoid missing nested interrupts for a GPIO line.
707  * If we wait to unmask individual GPIO lines in the bank after the
708  * line's interrupt handler has been run, we may miss some nested
709  * interrupts.
710  */
711 static void omap_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
712 {
713         void __iomem *isr_reg = NULL;
714         u32 isr;
715         unsigned int bit;
716         struct gpio_bank *bank;
717         int unmasked = 0;
718         struct irq_chip *irqchip = irq_desc_get_chip(desc);
719         struct gpio_chip *chip = irq_get_handler_data(irq);
720
721         chained_irq_enter(irqchip, desc);
722
723         bank = container_of(chip, struct gpio_bank, chip);
724         isr_reg = bank->base + bank->regs->irqstatus;
725         pm_runtime_get_sync(bank->dev);
726
727         if (WARN_ON(!isr_reg))
728                 goto exit;
729
730         while (1) {
731                 u32 isr_saved, level_mask = 0;
732                 u32 enabled;
733
734                 enabled = omap_get_gpio_irqbank_mask(bank);
735                 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
736
737                 if (bank->level_mask)
738                         level_mask = bank->level_mask & enabled;
739
740                 /* clear edge sensitive interrupts before handler(s) are
741                 called so that we don't miss any interrupt occurred while
742                 executing them */
743                 omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
744                 omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
745                 omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
746
747                 /* if there is only edge sensitive GPIO pin interrupts
748                 configured, we could unmask GPIO bank interrupt immediately */
749                 if (!level_mask && !unmasked) {
750                         unmasked = 1;
751                         chained_irq_exit(irqchip, desc);
752                 }
753
754                 if (!isr)
755                         break;
756
757                 while (isr) {
758                         bit = __ffs(isr);
759                         isr &= ~(BIT(bit));
760
761                         /*
762                          * Some chips can't respond to both rising and falling
763                          * at the same time.  If this irq was requested with
764                          * both flags, we need to flip the ICR data for the IRQ
765                          * to respond to the IRQ for the opposite direction.
766                          * This will be indicated in the bank toggle_mask.
767                          */
768                         if (bank->toggle_mask & (BIT(bit)))
769                                 omap_toggle_gpio_edge_triggering(bank, bit);
770
771                         generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
772                                                             bit));
773                 }
774         }
775         /* if bank has any level sensitive GPIO pin interrupt
776         configured, we must unmask the bank interrupt only after
777         handler(s) are executed in order to avoid spurious bank
778         interrupt */
779 exit:
780         if (!unmasked)
781                 chained_irq_exit(irqchip, desc);
782         pm_runtime_put(bank->dev);
783 }
784
785 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
786 {
787         struct gpio_bank *bank = omap_irq_data_get_bank(d);
788         unsigned long flags;
789         unsigned offset = d->hwirq;
790
791         if (!BANK_USED(bank))
792                 pm_runtime_get_sync(bank->dev);
793
794         spin_lock_irqsave(&bank->lock, flags);
795
796         if (!LINE_USED(bank->mod_usage, offset))
797                 omap_set_gpio_direction(bank, offset, 1);
798         else if (!omap_gpio_is_input(bank, offset))
799                 goto err;
800         omap_enable_gpio_module(bank, offset);
801         bank->irq_usage |= BIT(offset);
802
803         spin_unlock_irqrestore(&bank->lock, flags);
804         omap_gpio_unmask_irq(d);
805
806         return 0;
807 err:
808         spin_unlock_irqrestore(&bank->lock, flags);
809         if (!BANK_USED(bank))
810                 pm_runtime_put(bank->dev);
811         return -EINVAL;
812 }
813
814 static void omap_gpio_irq_shutdown(struct irq_data *d)
815 {
816         struct gpio_bank *bank = omap_irq_data_get_bank(d);
817         unsigned long flags;
818         unsigned offset = d->hwirq;
819
820         spin_lock_irqsave(&bank->lock, flags);
821         bank->irq_usage &= ~(BIT(offset));
822         omap_set_gpio_irqenable(bank, offset, 0);
823         omap_clear_gpio_irqstatus(bank, offset);
824         omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
825         if (!LINE_USED(bank->mod_usage, offset))
826                 omap_clear_gpio_debounce(bank, offset);
827         omap_disable_gpio_module(bank, offset);
828         spin_unlock_irqrestore(&bank->lock, flags);
829
830         /*
831          * If this is the last IRQ to be freed in the bank,
832          * disable the bank module.
833          */
834         if (!BANK_USED(bank))
835                 pm_runtime_put(bank->dev);
836 }
837
838 static void omap_gpio_ack_irq(struct irq_data *d)
839 {
840         struct gpio_bank *bank = omap_irq_data_get_bank(d);
841         unsigned offset = d->hwirq;
842
843         omap_clear_gpio_irqstatus(bank, offset);
844 }
845
846 static void omap_gpio_mask_irq(struct irq_data *d)
847 {
848         struct gpio_bank *bank = omap_irq_data_get_bank(d);
849         unsigned offset = d->hwirq;
850         unsigned long flags;
851
852         spin_lock_irqsave(&bank->lock, flags);
853         omap_set_gpio_irqenable(bank, offset, 0);
854         omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
855         spin_unlock_irqrestore(&bank->lock, flags);
856 }
857
858 static void omap_gpio_unmask_irq(struct irq_data *d)
859 {
860         struct gpio_bank *bank = omap_irq_data_get_bank(d);
861         unsigned offset = d->hwirq;
862         u32 trigger = irqd_get_trigger_type(d);
863         unsigned long flags;
864
865         spin_lock_irqsave(&bank->lock, flags);
866         if (trigger)
867                 omap_set_gpio_triggering(bank, offset, trigger);
868
869         /* For level-triggered GPIOs, the clearing must be done after
870          * the HW source is cleared, thus after the handler has run */
871         if (bank->level_mask & BIT(offset)) {
872                 omap_set_gpio_irqenable(bank, offset, 0);
873                 omap_clear_gpio_irqstatus(bank, offset);
874         }
875
876         omap_set_gpio_irqenable(bank, offset, 1);
877         spin_unlock_irqrestore(&bank->lock, flags);
878 }
879
880 /*---------------------------------------------------------------------*/
881
882 static int omap_mpuio_suspend_noirq(struct device *dev)
883 {
884         struct platform_device *pdev = to_platform_device(dev);
885         struct gpio_bank        *bank = platform_get_drvdata(pdev);
886         void __iomem            *mask_reg = bank->base +
887                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
888         unsigned long           flags;
889
890         spin_lock_irqsave(&bank->lock, flags);
891         writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
892         spin_unlock_irqrestore(&bank->lock, flags);
893
894         return 0;
895 }
896
897 static int omap_mpuio_resume_noirq(struct device *dev)
898 {
899         struct platform_device *pdev = to_platform_device(dev);
900         struct gpio_bank        *bank = platform_get_drvdata(pdev);
901         void __iomem            *mask_reg = bank->base +
902                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
903         unsigned long           flags;
904
905         spin_lock_irqsave(&bank->lock, flags);
906         writel_relaxed(bank->context.wake_en, mask_reg);
907         spin_unlock_irqrestore(&bank->lock, flags);
908
909         return 0;
910 }
911
912 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
913         .suspend_noirq = omap_mpuio_suspend_noirq,
914         .resume_noirq = omap_mpuio_resume_noirq,
915 };
916
917 /* use platform_driver for this. */
918 static struct platform_driver omap_mpuio_driver = {
919         .driver         = {
920                 .name   = "mpuio",
921                 .pm     = &omap_mpuio_dev_pm_ops,
922         },
923 };
924
925 static struct platform_device omap_mpuio_device = {
926         .name           = "mpuio",
927         .id             = -1,
928         .dev = {
929                 .driver = &omap_mpuio_driver.driver,
930         }
931         /* could list the /proc/iomem resources */
932 };
933
934 static inline void omap_mpuio_init(struct gpio_bank *bank)
935 {
936         platform_set_drvdata(&omap_mpuio_device, bank);
937
938         if (platform_driver_register(&omap_mpuio_driver) == 0)
939                 (void) platform_device_register(&omap_mpuio_device);
940 }
941
942 /*---------------------------------------------------------------------*/
943
944 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
945 {
946         struct gpio_bank *bank;
947         unsigned long flags;
948         void __iomem *reg;
949         int dir;
950
951         bank = container_of(chip, struct gpio_bank, chip);
952         reg = bank->base + bank->regs->direction;
953         spin_lock_irqsave(&bank->lock, flags);
954         dir = !!(readl_relaxed(reg) & BIT(offset));
955         spin_unlock_irqrestore(&bank->lock, flags);
956         return dir;
957 }
958
959 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
960 {
961         struct gpio_bank *bank;
962         unsigned long flags;
963
964         bank = container_of(chip, struct gpio_bank, chip);
965         spin_lock_irqsave(&bank->lock, flags);
966         omap_set_gpio_direction(bank, offset, 1);
967         spin_unlock_irqrestore(&bank->lock, flags);
968         return 0;
969 }
970
971 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
972 {
973         struct gpio_bank *bank;
974
975         bank = container_of(chip, struct gpio_bank, chip);
976
977         if (omap_gpio_is_input(bank, offset))
978                 return omap_get_gpio_datain(bank, offset);
979         else
980                 return omap_get_gpio_dataout(bank, offset);
981 }
982
983 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
984 {
985         struct gpio_bank *bank;
986         unsigned long flags;
987
988         bank = container_of(chip, struct gpio_bank, chip);
989         spin_lock_irqsave(&bank->lock, flags);
990         bank->set_dataout(bank, offset, value);
991         omap_set_gpio_direction(bank, offset, 0);
992         spin_unlock_irqrestore(&bank->lock, flags);
993         return 0;
994 }
995
996 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
997                               unsigned debounce)
998 {
999         struct gpio_bank *bank;
1000         unsigned long flags;
1001
1002         bank = container_of(chip, struct gpio_bank, chip);
1003
1004         spin_lock_irqsave(&bank->lock, flags);
1005         omap2_set_gpio_debounce(bank, offset, debounce);
1006         spin_unlock_irqrestore(&bank->lock, flags);
1007
1008         return 0;
1009 }
1010
1011 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1012 {
1013         struct gpio_bank *bank;
1014         unsigned long flags;
1015
1016         bank = container_of(chip, struct gpio_bank, chip);
1017         spin_lock_irqsave(&bank->lock, flags);
1018         bank->set_dataout(bank, offset, value);
1019         spin_unlock_irqrestore(&bank->lock, flags);
1020 }
1021
1022 /*---------------------------------------------------------------------*/
1023
1024 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1025 {
1026         static bool called;
1027         u32 rev;
1028
1029         if (called || bank->regs->revision == USHRT_MAX)
1030                 return;
1031
1032         rev = readw_relaxed(bank->base + bank->regs->revision);
1033         pr_info("OMAP GPIO hardware version %d.%d\n",
1034                 (rev >> 4) & 0x0f, rev & 0x0f);
1035
1036         called = true;
1037 }
1038
1039 static void omap_gpio_mod_init(struct gpio_bank *bank)
1040 {
1041         void __iomem *base = bank->base;
1042         u32 l = 0xffffffff;
1043
1044         if (bank->width == 16)
1045                 l = 0xffff;
1046
1047         if (bank->is_mpuio) {
1048                 writel_relaxed(l, bank->base + bank->regs->irqenable);
1049                 return;
1050         }
1051
1052         omap_gpio_rmw(base, bank->regs->irqenable, l,
1053                       bank->regs->irqenable_inv);
1054         omap_gpio_rmw(base, bank->regs->irqstatus, l,
1055                       !bank->regs->irqenable_inv);
1056         if (bank->regs->debounce_en)
1057                 writel_relaxed(0, base + bank->regs->debounce_en);
1058
1059         /* Save OE default value (0xffffffff) in the context */
1060         bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1061          /* Initialize interface clk ungated, module enabled */
1062         if (bank->regs->ctrl)
1063                 writel_relaxed(0, base + bank->regs->ctrl);
1064
1065         bank->dbck = clk_get(bank->dev, "dbclk");
1066         if (IS_ERR(bank->dbck))
1067                 dev_err(bank->dev, "Could not get gpio dbck\n");
1068 }
1069
1070 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1071 {
1072         static int gpio;
1073         int irq_base = 0;
1074         int ret;
1075
1076         /*
1077          * REVISIT eventually switch from OMAP-specific gpio structs
1078          * over to the generic ones
1079          */
1080         bank->chip.request = omap_gpio_request;
1081         bank->chip.free = omap_gpio_free;
1082         bank->chip.get_direction = omap_gpio_get_direction;
1083         bank->chip.direction_input = omap_gpio_input;
1084         bank->chip.get = omap_gpio_get;
1085         bank->chip.direction_output = omap_gpio_output;
1086         bank->chip.set_debounce = omap_gpio_debounce;
1087         bank->chip.set = omap_gpio_set;
1088         if (bank->is_mpuio) {
1089                 bank->chip.label = "mpuio";
1090                 if (bank->regs->wkup_en)
1091                         bank->chip.dev = &omap_mpuio_device.dev;
1092                 bank->chip.base = OMAP_MPUIO(0);
1093         } else {
1094                 bank->chip.label = "gpio";
1095                 bank->chip.base = gpio;
1096                 gpio += bank->width;
1097         }
1098         bank->chip.ngpio = bank->width;
1099
1100         ret = gpiochip_add(&bank->chip);
1101         if (ret) {
1102                 dev_err(bank->dev, "Could not register gpio chip %d\n", ret);
1103                 return ret;
1104         }
1105
1106 #ifdef CONFIG_ARCH_OMAP1
1107         /*
1108          * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1109          * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1110          */
1111         irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1112         if (irq_base < 0) {
1113                 dev_err(bank->dev, "Couldn't allocate IRQ numbers\n");
1114                 return -ENODEV;
1115         }
1116 #endif
1117
1118         /* MPUIO is a bit different, reading IRQ status clears it */
1119         if (bank->is_mpuio) {
1120                 irqc->irq_ack = dummy_irq_chip.irq_ack;
1121                 irqc->irq_mask = irq_gc_mask_set_bit;
1122                 irqc->irq_unmask = irq_gc_mask_clr_bit;
1123                 if (!bank->regs->wkup_en)
1124                         irqc->irq_set_wake = NULL;
1125         }
1126
1127         ret = gpiochip_irqchip_add(&bank->chip, irqc,
1128                                    irq_base, omap_gpio_irq_handler,
1129                                    IRQ_TYPE_NONE);
1130
1131         if (ret) {
1132                 dev_err(bank->dev, "Couldn't add irqchip to gpiochip %d\n", ret);
1133                 gpiochip_remove(&bank->chip);
1134                 return -ENODEV;
1135         }
1136
1137         gpiochip_set_chained_irqchip(&bank->chip, irqc,
1138                                      bank->irq, omap_gpio_irq_handler);
1139
1140         return 0;
1141 }
1142
1143 static const struct of_device_id omap_gpio_match[];
1144
1145 static int omap_gpio_probe(struct platform_device *pdev)
1146 {
1147         struct device *dev = &pdev->dev;
1148         struct device_node *node = dev->of_node;
1149         const struct of_device_id *match;
1150         const struct omap_gpio_platform_data *pdata;
1151         struct resource *res;
1152         struct gpio_bank *bank;
1153         struct irq_chip *irqc;
1154         int ret;
1155
1156         match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1157
1158         pdata = match ? match->data : dev_get_platdata(dev);
1159         if (!pdata)
1160                 return -EINVAL;
1161
1162         bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1163         if (!bank) {
1164                 dev_err(dev, "Memory alloc failed\n");
1165                 return -ENOMEM;
1166         }
1167
1168         irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1169         if (!irqc)
1170                 return -ENOMEM;
1171
1172         irqc->irq_startup = omap_gpio_irq_startup,
1173         irqc->irq_shutdown = omap_gpio_irq_shutdown,
1174         irqc->irq_ack = omap_gpio_ack_irq,
1175         irqc->irq_mask = omap_gpio_mask_irq,
1176         irqc->irq_unmask = omap_gpio_unmask_irq,
1177         irqc->irq_set_type = omap_gpio_irq_type,
1178         irqc->irq_set_wake = omap_gpio_wake_enable,
1179         irqc->name = dev_name(&pdev->dev);
1180
1181         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1182         if (unlikely(!res)) {
1183                 dev_err(dev, "Invalid IRQ resource\n");
1184                 return -ENODEV;
1185         }
1186
1187         bank->irq = res->start;
1188         bank->dev = dev;
1189         bank->chip.dev = dev;
1190         bank->chip.owner = THIS_MODULE;
1191         bank->dbck_flag = pdata->dbck_flag;
1192         bank->stride = pdata->bank_stride;
1193         bank->width = pdata->bank_width;
1194         bank->is_mpuio = pdata->is_mpuio;
1195         bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1196         bank->regs = pdata->regs;
1197 #ifdef CONFIG_OF_GPIO
1198         bank->chip.of_node = of_node_get(node);
1199 #endif
1200         if (node) {
1201                 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1202                         bank->loses_context = true;
1203         } else {
1204                 bank->loses_context = pdata->loses_context;
1205
1206                 if (bank->loses_context)
1207                         bank->get_context_loss_count =
1208                                 pdata->get_context_loss_count;
1209         }
1210
1211         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1212                 bank->set_dataout = omap_set_gpio_dataout_reg;
1213         else
1214                 bank->set_dataout = omap_set_gpio_dataout_mask;
1215
1216         spin_lock_init(&bank->lock);
1217
1218         /* Static mapping, never released */
1219         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1220         bank->base = devm_ioremap_resource(dev, res);
1221         if (IS_ERR(bank->base)) {
1222                 irq_domain_remove(bank->chip.irqdomain);
1223                 return PTR_ERR(bank->base);
1224         }
1225
1226         platform_set_drvdata(pdev, bank);
1227
1228         pm_runtime_enable(bank->dev);
1229         pm_runtime_irq_safe(bank->dev);
1230         pm_runtime_get_sync(bank->dev);
1231
1232         if (bank->is_mpuio)
1233                 omap_mpuio_init(bank);
1234
1235         omap_gpio_mod_init(bank);
1236
1237         ret = omap_gpio_chip_init(bank, irqc);
1238         if (ret)
1239                 return ret;
1240
1241         omap_gpio_show_rev(bank);
1242
1243         pm_runtime_put(bank->dev);
1244
1245         list_add_tail(&bank->node, &omap_gpio_list);
1246
1247         return 0;
1248 }
1249
1250 static int omap_gpio_remove(struct platform_device *pdev)
1251 {
1252         struct gpio_bank *bank = platform_get_drvdata(pdev);
1253
1254         list_del(&bank->node);
1255         gpiochip_remove(&bank->chip);
1256         pm_runtime_disable(bank->dev);
1257
1258         return 0;
1259 }
1260
1261 #ifdef CONFIG_ARCH_OMAP2PLUS
1262
1263 #if defined(CONFIG_PM)
1264 static void omap_gpio_restore_context(struct gpio_bank *bank);
1265
1266 static int omap_gpio_runtime_suspend(struct device *dev)
1267 {
1268         struct platform_device *pdev = to_platform_device(dev);
1269         struct gpio_bank *bank = platform_get_drvdata(pdev);
1270         u32 l1 = 0, l2 = 0;
1271         unsigned long flags;
1272         u32 wake_low, wake_hi;
1273
1274         spin_lock_irqsave(&bank->lock, flags);
1275
1276         /*
1277          * Only edges can generate a wakeup event to the PRCM.
1278          *
1279          * Therefore, ensure any wake-up capable GPIOs have
1280          * edge-detection enabled before going idle to ensure a wakeup
1281          * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1282          * NDA TRM 25.5.3.1)
1283          *
1284          * The normal values will be restored upon ->runtime_resume()
1285          * by writing back the values saved in bank->context.
1286          */
1287         wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1288         if (wake_low)
1289                 writel_relaxed(wake_low | bank->context.fallingdetect,
1290                              bank->base + bank->regs->fallingdetect);
1291         wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1292         if (wake_hi)
1293                 writel_relaxed(wake_hi | bank->context.risingdetect,
1294                              bank->base + bank->regs->risingdetect);
1295
1296         if (!bank->enabled_non_wakeup_gpios)
1297                 goto update_gpio_context_count;
1298
1299         if (bank->power_mode != OFF_MODE) {
1300                 bank->power_mode = 0;
1301                 goto update_gpio_context_count;
1302         }
1303         /*
1304          * If going to OFF, remove triggering for all
1305          * non-wakeup GPIOs.  Otherwise spurious IRQs will be
1306          * generated.  See OMAP2420 Errata item 1.101.
1307          */
1308         bank->saved_datain = readl_relaxed(bank->base +
1309                                                 bank->regs->datain);
1310         l1 = bank->context.fallingdetect;
1311         l2 = bank->context.risingdetect;
1312
1313         l1 &= ~bank->enabled_non_wakeup_gpios;
1314         l2 &= ~bank->enabled_non_wakeup_gpios;
1315
1316         writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1317         writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1318
1319         bank->workaround_enabled = true;
1320
1321 update_gpio_context_count:
1322         if (bank->get_context_loss_count)
1323                 bank->context_loss_count =
1324                                 bank->get_context_loss_count(bank->dev);
1325
1326         omap_gpio_dbck_disable(bank);
1327         spin_unlock_irqrestore(&bank->lock, flags);
1328
1329         return 0;
1330 }
1331
1332 static void omap_gpio_init_context(struct gpio_bank *p);
1333
1334 static int omap_gpio_runtime_resume(struct device *dev)
1335 {
1336         struct platform_device *pdev = to_platform_device(dev);
1337         struct gpio_bank *bank = platform_get_drvdata(pdev);
1338         u32 l = 0, gen, gen0, gen1;
1339         unsigned long flags;
1340         int c;
1341
1342         spin_lock_irqsave(&bank->lock, flags);
1343
1344         /*
1345          * On the first resume during the probe, the context has not
1346          * been initialised and so initialise it now. Also initialise
1347          * the context loss count.
1348          */
1349         if (bank->loses_context && !bank->context_valid) {
1350                 omap_gpio_init_context(bank);
1351
1352                 if (bank->get_context_loss_count)
1353                         bank->context_loss_count =
1354                                 bank->get_context_loss_count(bank->dev);
1355         }
1356
1357         omap_gpio_dbck_enable(bank);
1358
1359         /*
1360          * In ->runtime_suspend(), level-triggered, wakeup-enabled
1361          * GPIOs were set to edge trigger also in order to be able to
1362          * generate a PRCM wakeup.  Here we restore the
1363          * pre-runtime_suspend() values for edge triggering.
1364          */
1365         writel_relaxed(bank->context.fallingdetect,
1366                      bank->base + bank->regs->fallingdetect);
1367         writel_relaxed(bank->context.risingdetect,
1368                      bank->base + bank->regs->risingdetect);
1369
1370         if (bank->loses_context) {
1371                 if (!bank->get_context_loss_count) {
1372                         omap_gpio_restore_context(bank);
1373                 } else {
1374                         c = bank->get_context_loss_count(bank->dev);
1375                         if (c != bank->context_loss_count) {
1376                                 omap_gpio_restore_context(bank);
1377                         } else {
1378                                 spin_unlock_irqrestore(&bank->lock, flags);
1379                                 return 0;
1380                         }
1381                 }
1382         }
1383
1384         if (!bank->workaround_enabled) {
1385                 spin_unlock_irqrestore(&bank->lock, flags);
1386                 return 0;
1387         }
1388
1389         l = readl_relaxed(bank->base + bank->regs->datain);
1390
1391         /*
1392          * Check if any of the non-wakeup interrupt GPIOs have changed
1393          * state.  If so, generate an IRQ by software.  This is
1394          * horribly racy, but it's the best we can do to work around
1395          * this silicon bug.
1396          */
1397         l ^= bank->saved_datain;
1398         l &= bank->enabled_non_wakeup_gpios;
1399
1400         /*
1401          * No need to generate IRQs for the rising edge for gpio IRQs
1402          * configured with falling edge only; and vice versa.
1403          */
1404         gen0 = l & bank->context.fallingdetect;
1405         gen0 &= bank->saved_datain;
1406
1407         gen1 = l & bank->context.risingdetect;
1408         gen1 &= ~(bank->saved_datain);
1409
1410         /* FIXME: Consider GPIO IRQs with level detections properly! */
1411         gen = l & (~(bank->context.fallingdetect) &
1412                                          ~(bank->context.risingdetect));
1413         /* Consider all GPIO IRQs needed to be updated */
1414         gen |= gen0 | gen1;
1415
1416         if (gen) {
1417                 u32 old0, old1;
1418
1419                 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1420                 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1421
1422                 if (!bank->regs->irqstatus_raw0) {
1423                         writel_relaxed(old0 | gen, bank->base +
1424                                                 bank->regs->leveldetect0);
1425                         writel_relaxed(old1 | gen, bank->base +
1426                                                 bank->regs->leveldetect1);
1427                 }
1428
1429                 if (bank->regs->irqstatus_raw0) {
1430                         writel_relaxed(old0 | l, bank->base +
1431                                                 bank->regs->leveldetect0);
1432                         writel_relaxed(old1 | l, bank->base +
1433                                                 bank->regs->leveldetect1);
1434                 }
1435                 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1436                 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1437         }
1438
1439         bank->workaround_enabled = false;
1440         spin_unlock_irqrestore(&bank->lock, flags);
1441
1442         return 0;
1443 }
1444 #endif /* CONFIG_PM */
1445
1446 #if IS_BUILTIN(CONFIG_GPIO_OMAP)
1447 void omap2_gpio_prepare_for_idle(int pwr_mode)
1448 {
1449         struct gpio_bank *bank;
1450
1451         list_for_each_entry(bank, &omap_gpio_list, node) {
1452                 if (!BANK_USED(bank) || !bank->loses_context)
1453                         continue;
1454
1455                 bank->power_mode = pwr_mode;
1456
1457                 pm_runtime_put_sync_suspend(bank->dev);
1458         }
1459 }
1460
1461 void omap2_gpio_resume_after_idle(void)
1462 {
1463         struct gpio_bank *bank;
1464
1465         list_for_each_entry(bank, &omap_gpio_list, node) {
1466                 if (!BANK_USED(bank) || !bank->loses_context)
1467                         continue;
1468
1469                 pm_runtime_get_sync(bank->dev);
1470         }
1471 }
1472 #endif
1473
1474 #if defined(CONFIG_PM)
1475 static void omap_gpio_init_context(struct gpio_bank *p)
1476 {
1477         struct omap_gpio_reg_offs *regs = p->regs;
1478         void __iomem *base = p->base;
1479
1480         p->context.ctrl         = readl_relaxed(base + regs->ctrl);
1481         p->context.oe           = readl_relaxed(base + regs->direction);
1482         p->context.wake_en      = readl_relaxed(base + regs->wkup_en);
1483         p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1484         p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1485         p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1486         p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1487         p->context.irqenable1   = readl_relaxed(base + regs->irqenable);
1488         p->context.irqenable2   = readl_relaxed(base + regs->irqenable2);
1489
1490         if (regs->set_dataout && p->regs->clr_dataout)
1491                 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1492         else
1493                 p->context.dataout = readl_relaxed(base + regs->dataout);
1494
1495         p->context_valid = true;
1496 }
1497
1498 static void omap_gpio_restore_context(struct gpio_bank *bank)
1499 {
1500         writel_relaxed(bank->context.wake_en,
1501                                 bank->base + bank->regs->wkup_en);
1502         writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1503         writel_relaxed(bank->context.leveldetect0,
1504                                 bank->base + bank->regs->leveldetect0);
1505         writel_relaxed(bank->context.leveldetect1,
1506                                 bank->base + bank->regs->leveldetect1);
1507         writel_relaxed(bank->context.risingdetect,
1508                                 bank->base + bank->regs->risingdetect);
1509         writel_relaxed(bank->context.fallingdetect,
1510                                 bank->base + bank->regs->fallingdetect);
1511         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1512                 writel_relaxed(bank->context.dataout,
1513                                 bank->base + bank->regs->set_dataout);
1514         else
1515                 writel_relaxed(bank->context.dataout,
1516                                 bank->base + bank->regs->dataout);
1517         writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1518
1519         if (bank->dbck_enable_mask) {
1520                 writel_relaxed(bank->context.debounce, bank->base +
1521                                         bank->regs->debounce);
1522                 writel_relaxed(bank->context.debounce_en,
1523                                         bank->base + bank->regs->debounce_en);
1524         }
1525
1526         writel_relaxed(bank->context.irqenable1,
1527                                 bank->base + bank->regs->irqenable);
1528         writel_relaxed(bank->context.irqenable2,
1529                                 bank->base + bank->regs->irqenable2);
1530 }
1531 #endif /* CONFIG_PM */
1532 #else
1533 #define omap_gpio_runtime_suspend NULL
1534 #define omap_gpio_runtime_resume NULL
1535 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1536 #endif
1537
1538 static const struct dev_pm_ops gpio_pm_ops = {
1539         SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1540                                                                         NULL)
1541 };
1542
1543 #if defined(CONFIG_OF)
1544 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1545         .revision =             OMAP24XX_GPIO_REVISION,
1546         .direction =            OMAP24XX_GPIO_OE,
1547         .datain =               OMAP24XX_GPIO_DATAIN,
1548         .dataout =              OMAP24XX_GPIO_DATAOUT,
1549         .set_dataout =          OMAP24XX_GPIO_SETDATAOUT,
1550         .clr_dataout =          OMAP24XX_GPIO_CLEARDATAOUT,
1551         .irqstatus =            OMAP24XX_GPIO_IRQSTATUS1,
1552         .irqstatus2 =           OMAP24XX_GPIO_IRQSTATUS2,
1553         .irqenable =            OMAP24XX_GPIO_IRQENABLE1,
1554         .irqenable2 =           OMAP24XX_GPIO_IRQENABLE2,
1555         .set_irqenable =        OMAP24XX_GPIO_SETIRQENABLE1,
1556         .clr_irqenable =        OMAP24XX_GPIO_CLEARIRQENABLE1,
1557         .debounce =             OMAP24XX_GPIO_DEBOUNCE_VAL,
1558         .debounce_en =          OMAP24XX_GPIO_DEBOUNCE_EN,
1559         .ctrl =                 OMAP24XX_GPIO_CTRL,
1560         .wkup_en =              OMAP24XX_GPIO_WAKE_EN,
1561         .leveldetect0 =         OMAP24XX_GPIO_LEVELDETECT0,
1562         .leveldetect1 =         OMAP24XX_GPIO_LEVELDETECT1,
1563         .risingdetect =         OMAP24XX_GPIO_RISINGDETECT,
1564         .fallingdetect =        OMAP24XX_GPIO_FALLINGDETECT,
1565 };
1566
1567 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1568         .revision =             OMAP4_GPIO_REVISION,
1569         .direction =            OMAP4_GPIO_OE,
1570         .datain =               OMAP4_GPIO_DATAIN,
1571         .dataout =              OMAP4_GPIO_DATAOUT,
1572         .set_dataout =          OMAP4_GPIO_SETDATAOUT,
1573         .clr_dataout =          OMAP4_GPIO_CLEARDATAOUT,
1574         .irqstatus =            OMAP4_GPIO_IRQSTATUS0,
1575         .irqstatus2 =           OMAP4_GPIO_IRQSTATUS1,
1576         .irqenable =            OMAP4_GPIO_IRQSTATUSSET0,
1577         .irqenable2 =           OMAP4_GPIO_IRQSTATUSSET1,
1578         .set_irqenable =        OMAP4_GPIO_IRQSTATUSSET0,
1579         .clr_irqenable =        OMAP4_GPIO_IRQSTATUSCLR0,
1580         .debounce =             OMAP4_GPIO_DEBOUNCINGTIME,
1581         .debounce_en =          OMAP4_GPIO_DEBOUNCENABLE,
1582         .ctrl =                 OMAP4_GPIO_CTRL,
1583         .wkup_en =              OMAP4_GPIO_IRQWAKEN0,
1584         .leveldetect0 =         OMAP4_GPIO_LEVELDETECT0,
1585         .leveldetect1 =         OMAP4_GPIO_LEVELDETECT1,
1586         .risingdetect =         OMAP4_GPIO_RISINGDETECT,
1587         .fallingdetect =        OMAP4_GPIO_FALLINGDETECT,
1588 };
1589
1590 static const struct omap_gpio_platform_data omap2_pdata = {
1591         .regs = &omap2_gpio_regs,
1592         .bank_width = 32,
1593         .dbck_flag = false,
1594 };
1595
1596 static const struct omap_gpio_platform_data omap3_pdata = {
1597         .regs = &omap2_gpio_regs,
1598         .bank_width = 32,
1599         .dbck_flag = true,
1600 };
1601
1602 static const struct omap_gpio_platform_data omap4_pdata = {
1603         .regs = &omap4_gpio_regs,
1604         .bank_width = 32,
1605         .dbck_flag = true,
1606 };
1607
1608 static const struct of_device_id omap_gpio_match[] = {
1609         {
1610                 .compatible = "ti,omap4-gpio",
1611                 .data = &omap4_pdata,
1612         },
1613         {
1614                 .compatible = "ti,omap3-gpio",
1615                 .data = &omap3_pdata,
1616         },
1617         {
1618                 .compatible = "ti,omap2-gpio",
1619                 .data = &omap2_pdata,
1620         },
1621         { },
1622 };
1623 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1624 #endif
1625
1626 static struct platform_driver omap_gpio_driver = {
1627         .probe          = omap_gpio_probe,
1628         .remove         = omap_gpio_remove,
1629         .driver         = {
1630                 .name   = "omap_gpio",
1631                 .pm     = &gpio_pm_ops,
1632                 .of_match_table = of_match_ptr(omap_gpio_match),
1633         },
1634 };
1635
1636 /*
1637  * gpio driver register needs to be done before
1638  * machine_init functions access gpio APIs.
1639  * Hence omap_gpio_drv_reg() is a postcore_initcall.
1640  */
1641 static int __init omap_gpio_drv_reg(void)
1642 {
1643         return platform_driver_register(&omap_gpio_driver);
1644 }
1645 postcore_initcall(omap_gpio_drv_reg);
1646
1647 static void __exit omap_gpio_exit(void)
1648 {
1649         platform_driver_unregister(&omap_gpio_driver);
1650 }
1651 module_exit(omap_gpio_exit);
1652
1653 MODULE_DESCRIPTION("omap gpio driver");
1654 MODULE_ALIAS("platform:gpio-omap");
1655 MODULE_LICENSE("GPL v2");