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Merge tag 'vfio-v3.17-rc1' of git://github.com/awilliam/linux-vfio
[deliverable/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, 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 static struct irq_chip gpio_irq_chip = {
861 .name = "GPIO",
862 .irq_shutdown = omap_gpio_irq_shutdown,
863 .irq_ack = omap_gpio_ack_irq,
864 .irq_mask = omap_gpio_mask_irq,
865 .irq_unmask = omap_gpio_unmask_irq,
866 .irq_set_type = omap_gpio_irq_type,
867 .irq_set_wake = omap_gpio_wake_enable,
868 };
869
870 /*---------------------------------------------------------------------*/
871
872 static int omap_mpuio_suspend_noirq(struct device *dev)
873 {
874 struct platform_device *pdev = to_platform_device(dev);
875 struct gpio_bank *bank = platform_get_drvdata(pdev);
876 void __iomem *mask_reg = bank->base +
877 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
878 unsigned long flags;
879
880 spin_lock_irqsave(&bank->lock, flags);
881 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
882 spin_unlock_irqrestore(&bank->lock, flags);
883
884 return 0;
885 }
886
887 static int omap_mpuio_resume_noirq(struct device *dev)
888 {
889 struct platform_device *pdev = to_platform_device(dev);
890 struct gpio_bank *bank = platform_get_drvdata(pdev);
891 void __iomem *mask_reg = bank->base +
892 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
893 unsigned long flags;
894
895 spin_lock_irqsave(&bank->lock, flags);
896 writel_relaxed(bank->context.wake_en, mask_reg);
897 spin_unlock_irqrestore(&bank->lock, flags);
898
899 return 0;
900 }
901
902 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
903 .suspend_noirq = omap_mpuio_suspend_noirq,
904 .resume_noirq = omap_mpuio_resume_noirq,
905 };
906
907 /* use platform_driver for this. */
908 static struct platform_driver omap_mpuio_driver = {
909 .driver = {
910 .name = "mpuio",
911 .pm = &omap_mpuio_dev_pm_ops,
912 },
913 };
914
915 static struct platform_device omap_mpuio_device = {
916 .name = "mpuio",
917 .id = -1,
918 .dev = {
919 .driver = &omap_mpuio_driver.driver,
920 }
921 /* could list the /proc/iomem resources */
922 };
923
924 static inline void omap_mpuio_init(struct gpio_bank *bank)
925 {
926 platform_set_drvdata(&omap_mpuio_device, bank);
927
928 if (platform_driver_register(&omap_mpuio_driver) == 0)
929 (void) platform_device_register(&omap_mpuio_device);
930 }
931
932 /*---------------------------------------------------------------------*/
933
934 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
935 {
936 struct gpio_bank *bank;
937 unsigned long flags;
938 void __iomem *reg;
939 int dir;
940
941 bank = container_of(chip, struct gpio_bank, chip);
942 reg = bank->base + bank->regs->direction;
943 spin_lock_irqsave(&bank->lock, flags);
944 dir = !!(readl_relaxed(reg) & BIT(offset));
945 spin_unlock_irqrestore(&bank->lock, flags);
946 return dir;
947 }
948
949 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
950 {
951 struct gpio_bank *bank;
952 unsigned long flags;
953
954 bank = container_of(chip, struct gpio_bank, chip);
955 spin_lock_irqsave(&bank->lock, flags);
956 omap_set_gpio_direction(bank, offset, 1);
957 spin_unlock_irqrestore(&bank->lock, flags);
958 return 0;
959 }
960
961 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
962 {
963 struct gpio_bank *bank;
964 u32 mask;
965
966 bank = container_of(chip, struct gpio_bank, chip);
967 mask = (BIT(offset));
968
969 if (omap_gpio_is_input(bank, mask))
970 return omap_get_gpio_datain(bank, offset);
971 else
972 return omap_get_gpio_dataout(bank, offset);
973 }
974
975 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
976 {
977 struct gpio_bank *bank;
978 unsigned long flags;
979
980 bank = container_of(chip, struct gpio_bank, chip);
981 spin_lock_irqsave(&bank->lock, flags);
982 bank->set_dataout(bank, offset, value);
983 omap_set_gpio_direction(bank, offset, 0);
984 spin_unlock_irqrestore(&bank->lock, flags);
985 return 0;
986 }
987
988 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
989 unsigned debounce)
990 {
991 struct gpio_bank *bank;
992 unsigned long flags;
993
994 bank = container_of(chip, struct gpio_bank, chip);
995
996 spin_lock_irqsave(&bank->lock, flags);
997 omap2_set_gpio_debounce(bank, offset, debounce);
998 spin_unlock_irqrestore(&bank->lock, flags);
999
1000 return 0;
1001 }
1002
1003 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1004 {
1005 struct gpio_bank *bank;
1006 unsigned long flags;
1007
1008 bank = container_of(chip, struct gpio_bank, chip);
1009 spin_lock_irqsave(&bank->lock, flags);
1010 bank->set_dataout(bank, offset, value);
1011 spin_unlock_irqrestore(&bank->lock, flags);
1012 }
1013
1014 /*---------------------------------------------------------------------*/
1015
1016 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1017 {
1018 static bool called;
1019 u32 rev;
1020
1021 if (called || bank->regs->revision == USHRT_MAX)
1022 return;
1023
1024 rev = readw_relaxed(bank->base + bank->regs->revision);
1025 pr_info("OMAP GPIO hardware version %d.%d\n",
1026 (rev >> 4) & 0x0f, rev & 0x0f);
1027
1028 called = true;
1029 }
1030
1031 static void omap_gpio_mod_init(struct gpio_bank *bank)
1032 {
1033 void __iomem *base = bank->base;
1034 u32 l = 0xffffffff;
1035
1036 if (bank->width == 16)
1037 l = 0xffff;
1038
1039 if (bank->is_mpuio) {
1040 writel_relaxed(l, bank->base + bank->regs->irqenable);
1041 return;
1042 }
1043
1044 omap_gpio_rmw(base, bank->regs->irqenable, l,
1045 bank->regs->irqenable_inv);
1046 omap_gpio_rmw(base, bank->regs->irqstatus, l,
1047 !bank->regs->irqenable_inv);
1048 if (bank->regs->debounce_en)
1049 writel_relaxed(0, base + bank->regs->debounce_en);
1050
1051 /* Save OE default value (0xffffffff) in the context */
1052 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1053 /* Initialize interface clk ungated, module enabled */
1054 if (bank->regs->ctrl)
1055 writel_relaxed(0, base + bank->regs->ctrl);
1056
1057 bank->dbck = clk_get(bank->dev, "dbclk");
1058 if (IS_ERR(bank->dbck))
1059 dev_err(bank->dev, "Could not get gpio dbck\n");
1060 }
1061
1062 static void
1063 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1064 unsigned int num)
1065 {
1066 struct irq_chip_generic *gc;
1067 struct irq_chip_type *ct;
1068
1069 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1070 handle_simple_irq);
1071 if (!gc) {
1072 dev_err(bank->dev, "Memory alloc failed for gc\n");
1073 return;
1074 }
1075
1076 ct = gc->chip_types;
1077
1078 /* NOTE: No ack required, reading IRQ status clears it. */
1079 ct->chip.irq_mask = irq_gc_mask_set_bit;
1080 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1081 ct->chip.irq_set_type = omap_gpio_irq_type;
1082
1083 if (bank->regs->wkup_en)
1084 ct->chip.irq_set_wake = omap_gpio_wake_enable;
1085
1086 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1087 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1088 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1089 }
1090
1091 static int omap_gpio_chip_init(struct gpio_bank *bank)
1092 {
1093 int j;
1094 static int gpio;
1095 int irq_base = 0;
1096 int ret;
1097
1098 /*
1099 * REVISIT eventually switch from OMAP-specific gpio structs
1100 * over to the generic ones
1101 */
1102 bank->chip.request = omap_gpio_request;
1103 bank->chip.free = omap_gpio_free;
1104 bank->chip.get_direction = omap_gpio_get_direction;
1105 bank->chip.direction_input = omap_gpio_input;
1106 bank->chip.get = omap_gpio_get;
1107 bank->chip.direction_output = omap_gpio_output;
1108 bank->chip.set_debounce = omap_gpio_debounce;
1109 bank->chip.set = omap_gpio_set;
1110 if (bank->is_mpuio) {
1111 bank->chip.label = "mpuio";
1112 if (bank->regs->wkup_en)
1113 bank->chip.dev = &omap_mpuio_device.dev;
1114 bank->chip.base = OMAP_MPUIO(0);
1115 } else {
1116 bank->chip.label = "gpio";
1117 bank->chip.base = gpio;
1118 gpio += bank->width;
1119 }
1120 bank->chip.ngpio = bank->width;
1121
1122 ret = gpiochip_add(&bank->chip);
1123 if (ret) {
1124 dev_err(bank->dev, "Could not register gpio chip %d\n", ret);
1125 return ret;
1126 }
1127
1128 #ifdef CONFIG_ARCH_OMAP1
1129 /*
1130 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1131 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1132 */
1133 irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1134 if (irq_base < 0) {
1135 dev_err(bank->dev, "Couldn't allocate IRQ numbers\n");
1136 return -ENODEV;
1137 }
1138 #endif
1139
1140 ret = gpiochip_irqchip_add(&bank->chip, &gpio_irq_chip,
1141 irq_base, omap_gpio_irq_handler,
1142 IRQ_TYPE_NONE);
1143
1144 if (ret) {
1145 dev_err(bank->dev, "Couldn't add irqchip to gpiochip %d\n", ret);
1146 ret = gpiochip_remove(&bank->chip);
1147 return -ENODEV;
1148 }
1149
1150 gpiochip_set_chained_irqchip(&bank->chip, &gpio_irq_chip,
1151 bank->irq, omap_gpio_irq_handler);
1152
1153 for (j = 0; j < bank->width; j++) {
1154 int irq = irq_find_mapping(bank->chip.irqdomain, j);
1155 if (bank->is_mpuio) {
1156 omap_mpuio_alloc_gc(bank, irq, bank->width);
1157 irq_set_chip_and_handler(irq, NULL, NULL);
1158 set_irq_flags(irq, 0);
1159 }
1160 }
1161
1162 return 0;
1163 }
1164
1165 static const struct of_device_id omap_gpio_match[];
1166
1167 static int omap_gpio_probe(struct platform_device *pdev)
1168 {
1169 struct device *dev = &pdev->dev;
1170 struct device_node *node = dev->of_node;
1171 const struct of_device_id *match;
1172 const struct omap_gpio_platform_data *pdata;
1173 struct resource *res;
1174 struct gpio_bank *bank;
1175 int ret;
1176
1177 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1178
1179 pdata = match ? match->data : dev_get_platdata(dev);
1180 if (!pdata)
1181 return -EINVAL;
1182
1183 bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1184 if (!bank) {
1185 dev_err(dev, "Memory alloc failed\n");
1186 return -ENOMEM;
1187 }
1188
1189 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1190 if (unlikely(!res)) {
1191 dev_err(dev, "Invalid IRQ resource\n");
1192 return -ENODEV;
1193 }
1194
1195 bank->irq = res->start;
1196 bank->dev = dev;
1197 bank->chip.dev = dev;
1198 bank->dbck_flag = pdata->dbck_flag;
1199 bank->stride = pdata->bank_stride;
1200 bank->width = pdata->bank_width;
1201 bank->is_mpuio = pdata->is_mpuio;
1202 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1203 bank->regs = pdata->regs;
1204 #ifdef CONFIG_OF_GPIO
1205 bank->chip.of_node = of_node_get(node);
1206 #endif
1207 if (node) {
1208 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1209 bank->loses_context = true;
1210 } else {
1211 bank->loses_context = pdata->loses_context;
1212
1213 if (bank->loses_context)
1214 bank->get_context_loss_count =
1215 pdata->get_context_loss_count;
1216 }
1217
1218 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1219 bank->set_dataout = omap_set_gpio_dataout_reg;
1220 else
1221 bank->set_dataout = omap_set_gpio_dataout_mask;
1222
1223 spin_lock_init(&bank->lock);
1224
1225 /* Static mapping, never released */
1226 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1227 bank->base = devm_ioremap_resource(dev, res);
1228 if (IS_ERR(bank->base)) {
1229 irq_domain_remove(bank->chip.irqdomain);
1230 return PTR_ERR(bank->base);
1231 }
1232
1233 platform_set_drvdata(pdev, bank);
1234
1235 pm_runtime_enable(bank->dev);
1236 pm_runtime_irq_safe(bank->dev);
1237 pm_runtime_get_sync(bank->dev);
1238
1239 if (bank->is_mpuio)
1240 omap_mpuio_init(bank);
1241
1242 omap_gpio_mod_init(bank);
1243
1244 ret = omap_gpio_chip_init(bank);
1245 if (ret)
1246 return ret;
1247
1248 omap_gpio_show_rev(bank);
1249
1250 pm_runtime_put(bank->dev);
1251
1252 list_add_tail(&bank->node, &omap_gpio_list);
1253
1254 return 0;
1255 }
1256
1257 #ifdef CONFIG_ARCH_OMAP2PLUS
1258
1259 #if defined(CONFIG_PM_RUNTIME)
1260 static void omap_gpio_restore_context(struct gpio_bank *bank);
1261
1262 static int omap_gpio_runtime_suspend(struct device *dev)
1263 {
1264 struct platform_device *pdev = to_platform_device(dev);
1265 struct gpio_bank *bank = platform_get_drvdata(pdev);
1266 u32 l1 = 0, l2 = 0;
1267 unsigned long flags;
1268 u32 wake_low, wake_hi;
1269
1270 spin_lock_irqsave(&bank->lock, flags);
1271
1272 /*
1273 * Only edges can generate a wakeup event to the PRCM.
1274 *
1275 * Therefore, ensure any wake-up capable GPIOs have
1276 * edge-detection enabled before going idle to ensure a wakeup
1277 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1278 * NDA TRM 25.5.3.1)
1279 *
1280 * The normal values will be restored upon ->runtime_resume()
1281 * by writing back the values saved in bank->context.
1282 */
1283 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1284 if (wake_low)
1285 writel_relaxed(wake_low | bank->context.fallingdetect,
1286 bank->base + bank->regs->fallingdetect);
1287 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1288 if (wake_hi)
1289 writel_relaxed(wake_hi | bank->context.risingdetect,
1290 bank->base + bank->regs->risingdetect);
1291
1292 if (!bank->enabled_non_wakeup_gpios)
1293 goto update_gpio_context_count;
1294
1295 if (bank->power_mode != OFF_MODE) {
1296 bank->power_mode = 0;
1297 goto update_gpio_context_count;
1298 }
1299 /*
1300 * If going to OFF, remove triggering for all
1301 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1302 * generated. See OMAP2420 Errata item 1.101.
1303 */
1304 bank->saved_datain = readl_relaxed(bank->base +
1305 bank->regs->datain);
1306 l1 = bank->context.fallingdetect;
1307 l2 = bank->context.risingdetect;
1308
1309 l1 &= ~bank->enabled_non_wakeup_gpios;
1310 l2 &= ~bank->enabled_non_wakeup_gpios;
1311
1312 writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1313 writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1314
1315 bank->workaround_enabled = true;
1316
1317 update_gpio_context_count:
1318 if (bank->get_context_loss_count)
1319 bank->context_loss_count =
1320 bank->get_context_loss_count(bank->dev);
1321
1322 omap_gpio_dbck_disable(bank);
1323 spin_unlock_irqrestore(&bank->lock, flags);
1324
1325 return 0;
1326 }
1327
1328 static void omap_gpio_init_context(struct gpio_bank *p);
1329
1330 static int omap_gpio_runtime_resume(struct device *dev)
1331 {
1332 struct platform_device *pdev = to_platform_device(dev);
1333 struct gpio_bank *bank = platform_get_drvdata(pdev);
1334 u32 l = 0, gen, gen0, gen1;
1335 unsigned long flags;
1336 int c;
1337
1338 spin_lock_irqsave(&bank->lock, flags);
1339
1340 /*
1341 * On the first resume during the probe, the context has not
1342 * been initialised and so initialise it now. Also initialise
1343 * the context loss count.
1344 */
1345 if (bank->loses_context && !bank->context_valid) {
1346 omap_gpio_init_context(bank);
1347
1348 if (bank->get_context_loss_count)
1349 bank->context_loss_count =
1350 bank->get_context_loss_count(bank->dev);
1351 }
1352
1353 omap_gpio_dbck_enable(bank);
1354
1355 /*
1356 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1357 * GPIOs were set to edge trigger also in order to be able to
1358 * generate a PRCM wakeup. Here we restore the
1359 * pre-runtime_suspend() values for edge triggering.
1360 */
1361 writel_relaxed(bank->context.fallingdetect,
1362 bank->base + bank->regs->fallingdetect);
1363 writel_relaxed(bank->context.risingdetect,
1364 bank->base + bank->regs->risingdetect);
1365
1366 if (bank->loses_context) {
1367 if (!bank->get_context_loss_count) {
1368 omap_gpio_restore_context(bank);
1369 } else {
1370 c = bank->get_context_loss_count(bank->dev);
1371 if (c != bank->context_loss_count) {
1372 omap_gpio_restore_context(bank);
1373 } else {
1374 spin_unlock_irqrestore(&bank->lock, flags);
1375 return 0;
1376 }
1377 }
1378 }
1379
1380 if (!bank->workaround_enabled) {
1381 spin_unlock_irqrestore(&bank->lock, flags);
1382 return 0;
1383 }
1384
1385 l = readl_relaxed(bank->base + bank->regs->datain);
1386
1387 /*
1388 * Check if any of the non-wakeup interrupt GPIOs have changed
1389 * state. If so, generate an IRQ by software. This is
1390 * horribly racy, but it's the best we can do to work around
1391 * this silicon bug.
1392 */
1393 l ^= bank->saved_datain;
1394 l &= bank->enabled_non_wakeup_gpios;
1395
1396 /*
1397 * No need to generate IRQs for the rising edge for gpio IRQs
1398 * configured with falling edge only; and vice versa.
1399 */
1400 gen0 = l & bank->context.fallingdetect;
1401 gen0 &= bank->saved_datain;
1402
1403 gen1 = l & bank->context.risingdetect;
1404 gen1 &= ~(bank->saved_datain);
1405
1406 /* FIXME: Consider GPIO IRQs with level detections properly! */
1407 gen = l & (~(bank->context.fallingdetect) &
1408 ~(bank->context.risingdetect));
1409 /* Consider all GPIO IRQs needed to be updated */
1410 gen |= gen0 | gen1;
1411
1412 if (gen) {
1413 u32 old0, old1;
1414
1415 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1416 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1417
1418 if (!bank->regs->irqstatus_raw0) {
1419 writel_relaxed(old0 | gen, bank->base +
1420 bank->regs->leveldetect0);
1421 writel_relaxed(old1 | gen, bank->base +
1422 bank->regs->leveldetect1);
1423 }
1424
1425 if (bank->regs->irqstatus_raw0) {
1426 writel_relaxed(old0 | l, bank->base +
1427 bank->regs->leveldetect0);
1428 writel_relaxed(old1 | l, bank->base +
1429 bank->regs->leveldetect1);
1430 }
1431 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1432 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1433 }
1434
1435 bank->workaround_enabled = false;
1436 spin_unlock_irqrestore(&bank->lock, flags);
1437
1438 return 0;
1439 }
1440 #endif /* CONFIG_PM_RUNTIME */
1441
1442 void omap2_gpio_prepare_for_idle(int pwr_mode)
1443 {
1444 struct gpio_bank *bank;
1445
1446 list_for_each_entry(bank, &omap_gpio_list, node) {
1447 if (!BANK_USED(bank) || !bank->loses_context)
1448 continue;
1449
1450 bank->power_mode = pwr_mode;
1451
1452 pm_runtime_put_sync_suspend(bank->dev);
1453 }
1454 }
1455
1456 void omap2_gpio_resume_after_idle(void)
1457 {
1458 struct gpio_bank *bank;
1459
1460 list_for_each_entry(bank, &omap_gpio_list, node) {
1461 if (!BANK_USED(bank) || !bank->loses_context)
1462 continue;
1463
1464 pm_runtime_get_sync(bank->dev);
1465 }
1466 }
1467
1468 #if defined(CONFIG_PM_RUNTIME)
1469 static void omap_gpio_init_context(struct gpio_bank *p)
1470 {
1471 struct omap_gpio_reg_offs *regs = p->regs;
1472 void __iomem *base = p->base;
1473
1474 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1475 p->context.oe = readl_relaxed(base + regs->direction);
1476 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1477 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1478 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1479 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1480 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1481 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1482 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1483
1484 if (regs->set_dataout && p->regs->clr_dataout)
1485 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1486 else
1487 p->context.dataout = readl_relaxed(base + regs->dataout);
1488
1489 p->context_valid = true;
1490 }
1491
1492 static void omap_gpio_restore_context(struct gpio_bank *bank)
1493 {
1494 writel_relaxed(bank->context.wake_en,
1495 bank->base + bank->regs->wkup_en);
1496 writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1497 writel_relaxed(bank->context.leveldetect0,
1498 bank->base + bank->regs->leveldetect0);
1499 writel_relaxed(bank->context.leveldetect1,
1500 bank->base + bank->regs->leveldetect1);
1501 writel_relaxed(bank->context.risingdetect,
1502 bank->base + bank->regs->risingdetect);
1503 writel_relaxed(bank->context.fallingdetect,
1504 bank->base + bank->regs->fallingdetect);
1505 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1506 writel_relaxed(bank->context.dataout,
1507 bank->base + bank->regs->set_dataout);
1508 else
1509 writel_relaxed(bank->context.dataout,
1510 bank->base + bank->regs->dataout);
1511 writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1512
1513 if (bank->dbck_enable_mask) {
1514 writel_relaxed(bank->context.debounce, bank->base +
1515 bank->regs->debounce);
1516 writel_relaxed(bank->context.debounce_en,
1517 bank->base + bank->regs->debounce_en);
1518 }
1519
1520 writel_relaxed(bank->context.irqenable1,
1521 bank->base + bank->regs->irqenable);
1522 writel_relaxed(bank->context.irqenable2,
1523 bank->base + bank->regs->irqenable2);
1524 }
1525 #endif /* CONFIG_PM_RUNTIME */
1526 #else
1527 #define omap_gpio_runtime_suspend NULL
1528 #define omap_gpio_runtime_resume NULL
1529 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1530 #endif
1531
1532 static const struct dev_pm_ops gpio_pm_ops = {
1533 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1534 NULL)
1535 };
1536
1537 #if defined(CONFIG_OF)
1538 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1539 .revision = OMAP24XX_GPIO_REVISION,
1540 .direction = OMAP24XX_GPIO_OE,
1541 .datain = OMAP24XX_GPIO_DATAIN,
1542 .dataout = OMAP24XX_GPIO_DATAOUT,
1543 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1544 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1545 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1546 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1547 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1548 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1549 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1550 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1551 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1552 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1553 .ctrl = OMAP24XX_GPIO_CTRL,
1554 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1555 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1556 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1557 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1558 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1559 };
1560
1561 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1562 .revision = OMAP4_GPIO_REVISION,
1563 .direction = OMAP4_GPIO_OE,
1564 .datain = OMAP4_GPIO_DATAIN,
1565 .dataout = OMAP4_GPIO_DATAOUT,
1566 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1567 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1568 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1569 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1570 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1571 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1572 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1573 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1574 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1575 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1576 .ctrl = OMAP4_GPIO_CTRL,
1577 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1578 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1579 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1580 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1581 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1582 };
1583
1584 static const struct omap_gpio_platform_data omap2_pdata = {
1585 .regs = &omap2_gpio_regs,
1586 .bank_width = 32,
1587 .dbck_flag = false,
1588 };
1589
1590 static const struct omap_gpio_platform_data omap3_pdata = {
1591 .regs = &omap2_gpio_regs,
1592 .bank_width = 32,
1593 .dbck_flag = true,
1594 };
1595
1596 static const struct omap_gpio_platform_data omap4_pdata = {
1597 .regs = &omap4_gpio_regs,
1598 .bank_width = 32,
1599 .dbck_flag = true,
1600 };
1601
1602 static const struct of_device_id omap_gpio_match[] = {
1603 {
1604 .compatible = "ti,omap4-gpio",
1605 .data = &omap4_pdata,
1606 },
1607 {
1608 .compatible = "ti,omap3-gpio",
1609 .data = &omap3_pdata,
1610 },
1611 {
1612 .compatible = "ti,omap2-gpio",
1613 .data = &omap2_pdata,
1614 },
1615 { },
1616 };
1617 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1618 #endif
1619
1620 static struct platform_driver omap_gpio_driver = {
1621 .probe = omap_gpio_probe,
1622 .driver = {
1623 .name = "omap_gpio",
1624 .pm = &gpio_pm_ops,
1625 .of_match_table = of_match_ptr(omap_gpio_match),
1626 },
1627 };
1628
1629 /*
1630 * gpio driver register needs to be done before
1631 * machine_init functions access gpio APIs.
1632 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1633 */
1634 static int __init omap_gpio_drv_reg(void)
1635 {
1636 return platform_driver_register(&omap_gpio_driver);
1637 }
1638 postcore_initcall(omap_gpio_drv_reg);
Linux kernel - Deliverables
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