xref: /openbmc/linux/drivers/gpio/gpio-omap.c (revision bbecb07f) 
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 #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
33 
34 static LIST_HEAD(omap_gpio_list);
35 
36 struct gpio_regs {
37 	u32 irqenable1;
38 	u32 irqenable2;
39 	u32 wake_en;
40 	u32 ctrl;
41 	u32 oe;
42 	u32 leveldetect0;
43 	u32 leveldetect1;
44 	u32 risingdetect;
45 	u32 fallingdetect;
46 	u32 dataout;
47 	u32 debounce;
48 	u32 debounce_en;
49 };
50 
51 struct gpio_bank {
52 	struct list_head node;
53 	void __iomem *base;
54 	int irq;
55 	u32 non_wakeup_gpios;
56 	u32 enabled_non_wakeup_gpios;
57 	struct gpio_regs context;
58 	u32 saved_datain;
59 	u32 level_mask;
60 	u32 toggle_mask;
61 	raw_spinlock_t lock;
62 	raw_spinlock_t wa_lock;
63 	struct gpio_chip chip;
64 	struct clk *dbck;
65 	u32 mod_usage;
66 	u32 irq_usage;
67 	u32 dbck_enable_mask;
68 	bool dbck_enabled;
69 	bool is_mpuio;
70 	bool dbck_flag;
71 	bool loses_context;
72 	bool context_valid;
73 	int stride;
74 	u32 width;
75 	int context_loss_count;
76 	int power_mode;
77 	bool workaround_enabled;
78 
79 	void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
80 	int (*get_context_loss_count)(struct device *dev);
81 
82 	struct omap_gpio_reg_offs *regs;
83 };
84 
85 #define GPIO_MOD_CTRL_BIT	BIT(0)
86 
87 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
88 #define LINE_USED(line, offset) (line & (BIT(offset)))
89 
90 static void omap_gpio_unmask_irq(struct irq_data *d);
91 
92 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
93 {
94 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
95 	return gpiochip_get_data(chip);
96 }
97 
98 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
99 				    int is_input)
100 {
101 	void __iomem *reg = bank->base;
102 	u32 l;
103 
104 	reg += bank->regs->direction;
105 	l = readl_relaxed(reg);
106 	if (is_input)
107 		l |= BIT(gpio);
108 	else
109 		l &= ~(BIT(gpio));
110 	writel_relaxed(l, reg);
111 	bank->context.oe = l;
112 }
113 
114 
115 /* set data out value using dedicate set/clear register */
116 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
117 				      int enable)
118 {
119 	void __iomem *reg = bank->base;
120 	u32 l = BIT(offset);
121 
122 	if (enable) {
123 		reg += bank->regs->set_dataout;
124 		bank->context.dataout |= l;
125 	} else {
126 		reg += bank->regs->clr_dataout;
127 		bank->context.dataout &= ~l;
128 	}
129 
130 	writel_relaxed(l, reg);
131 }
132 
133 /* set data out value using mask register */
134 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
135 				       int enable)
136 {
137 	void __iomem *reg = bank->base + bank->regs->dataout;
138 	u32 gpio_bit = BIT(offset);
139 	u32 l;
140 
141 	l = readl_relaxed(reg);
142 	if (enable)
143 		l |= gpio_bit;
144 	else
145 		l &= ~gpio_bit;
146 	writel_relaxed(l, reg);
147 	bank->context.dataout = l;
148 }
149 
150 static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
151 {
152 	void __iomem *reg = bank->base + bank->regs->datain;
153 
154 	return (readl_relaxed(reg) & (BIT(offset))) != 0;
155 }
156 
157 static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
158 {
159 	void __iomem *reg = bank->base + bank->regs->dataout;
160 
161 	return (readl_relaxed(reg) & (BIT(offset))) != 0;
162 }
163 
164 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
165 {
166 	int l = readl_relaxed(base + reg);
167 
168 	if (set)
169 		l |= mask;
170 	else
171 		l &= ~mask;
172 
173 	writel_relaxed(l, base + reg);
174 }
175 
176 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
177 {
178 	if (bank->dbck_enable_mask && !bank->dbck_enabled) {
179 		clk_enable(bank->dbck);
180 		bank->dbck_enabled = true;
181 
182 		writel_relaxed(bank->dbck_enable_mask,
183 			     bank->base + bank->regs->debounce_en);
184 	}
185 }
186 
187 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
188 {
189 	if (bank->dbck_enable_mask && bank->dbck_enabled) {
190 		/*
191 		 * Disable debounce before cutting it's clock. If debounce is
192 		 * enabled but the clock is not, GPIO module seems to be unable
193 		 * to detect events and generate interrupts at least on OMAP3.
194 		 */
195 		writel_relaxed(0, bank->base + bank->regs->debounce_en);
196 
197 		clk_disable(bank->dbck);
198 		bank->dbck_enabled = false;
199 	}
200 }
201 
202 /**
203  * omap2_set_gpio_debounce - low level gpio debounce time
204  * @bank: the gpio bank we're acting upon
205  * @offset: the gpio number on this @bank
206  * @debounce: debounce time to use
207  *
208  * OMAP's debounce time is in 31us steps
209  *   <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
210  * so we need to convert and round up to the closest unit.
211  *
212  * Return: 0 on success, negative error otherwise.
213  */
214 static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
215 				   unsigned debounce)
216 {
217 	void __iomem		*reg;
218 	u32			val;
219 	u32			l;
220 	bool			enable = !!debounce;
221 
222 	if (!bank->dbck_flag)
223 		return -ENOTSUPP;
224 
225 	if (enable) {
226 		debounce = DIV_ROUND_UP(debounce, 31) - 1;
227 		if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
228 			return -EINVAL;
229 	}
230 
231 	l = BIT(offset);
232 
233 	clk_enable(bank->dbck);
234 	reg = bank->base + bank->regs->debounce;
235 	writel_relaxed(debounce, reg);
236 
237 	reg = bank->base + bank->regs->debounce_en;
238 	val = readl_relaxed(reg);
239 
240 	if (enable)
241 		val |= l;
242 	else
243 		val &= ~l;
244 	bank->dbck_enable_mask = val;
245 
246 	writel_relaxed(val, reg);
247 	clk_disable(bank->dbck);
248 	/*
249 	 * Enable debounce clock per module.
250 	 * This call is mandatory because in omap_gpio_request() when
251 	 * *_runtime_get_sync() is called,  _gpio_dbck_enable() within
252 	 * runtime callbck fails to turn on dbck because dbck_enable_mask
253 	 * used within _gpio_dbck_enable() is still not initialized at
254 	 * that point. Therefore we have to enable dbck here.
255 	 */
256 	omap_gpio_dbck_enable(bank);
257 	if (bank->dbck_enable_mask) {
258 		bank->context.debounce = debounce;
259 		bank->context.debounce_en = val;
260 	}
261 
262 	return 0;
263 }
264 
265 /**
266  * omap_clear_gpio_debounce - clear debounce settings for a gpio
267  * @bank: the gpio bank we're acting upon
268  * @offset: the gpio number on this @bank
269  *
270  * If a gpio is using debounce, then clear the debounce enable bit and if
271  * this is the only gpio in this bank using debounce, then clear the debounce
272  * time too. The debounce clock will also be disabled when calling this function
273  * if this is the only gpio in the bank using debounce.
274  */
275 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
276 {
277 	u32 gpio_bit = BIT(offset);
278 
279 	if (!bank->dbck_flag)
280 		return;
281 
282 	if (!(bank->dbck_enable_mask & gpio_bit))
283 		return;
284 
285 	bank->dbck_enable_mask &= ~gpio_bit;
286 	bank->context.debounce_en &= ~gpio_bit;
287         writel_relaxed(bank->context.debounce_en,
288 		     bank->base + bank->regs->debounce_en);
289 
290 	if (!bank->dbck_enable_mask) {
291 		bank->context.debounce = 0;
292 		writel_relaxed(bank->context.debounce, bank->base +
293 			     bank->regs->debounce);
294 		clk_disable(bank->dbck);
295 		bank->dbck_enabled = false;
296 	}
297 }
298 
299 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
300 						unsigned trigger)
301 {
302 	void __iomem *base = bank->base;
303 	u32 gpio_bit = BIT(gpio);
304 
305 	omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
306 		      trigger & IRQ_TYPE_LEVEL_LOW);
307 	omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
308 		      trigger & IRQ_TYPE_LEVEL_HIGH);
309 	omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
310 		      trigger & IRQ_TYPE_EDGE_RISING);
311 	omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
312 		      trigger & IRQ_TYPE_EDGE_FALLING);
313 
314 	bank->context.leveldetect0 =
315 			readl_relaxed(bank->base + bank->regs->leveldetect0);
316 	bank->context.leveldetect1 =
317 			readl_relaxed(bank->base + bank->regs->leveldetect1);
318 	bank->context.risingdetect =
319 			readl_relaxed(bank->base + bank->regs->risingdetect);
320 	bank->context.fallingdetect =
321 			readl_relaxed(bank->base + bank->regs->fallingdetect);
322 
323 	if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
324 		omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
325 		bank->context.wake_en =
326 			readl_relaxed(bank->base + bank->regs->wkup_en);
327 	}
328 
329 	/* This part needs to be executed always for OMAP{34xx, 44xx} */
330 	if (!bank->regs->irqctrl) {
331 		/* On omap24xx proceed only when valid GPIO bit is set */
332 		if (bank->non_wakeup_gpios) {
333 			if (!(bank->non_wakeup_gpios & gpio_bit))
334 				goto exit;
335 		}
336 
337 		/*
338 		 * Log the edge gpio and manually trigger the IRQ
339 		 * after resume if the input level changes
340 		 * to avoid irq lost during PER RET/OFF mode
341 		 * Applies for omap2 non-wakeup gpio and all omap3 gpios
342 		 */
343 		if (trigger & IRQ_TYPE_EDGE_BOTH)
344 			bank->enabled_non_wakeup_gpios |= gpio_bit;
345 		else
346 			bank->enabled_non_wakeup_gpios &= ~gpio_bit;
347 	}
348 
349 exit:
350 	bank->level_mask =
351 		readl_relaxed(bank->base + bank->regs->leveldetect0) |
352 		readl_relaxed(bank->base + bank->regs->leveldetect1);
353 }
354 
355 #ifdef CONFIG_ARCH_OMAP1
356 /*
357  * This only applies to chips that can't do both rising and falling edge
358  * detection at once.  For all other chips, this function is a noop.
359  */
360 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
361 {
362 	void __iomem *reg = bank->base;
363 	u32 l = 0;
364 
365 	if (!bank->regs->irqctrl)
366 		return;
367 
368 	reg += bank->regs->irqctrl;
369 
370 	l = readl_relaxed(reg);
371 	if ((l >> gpio) & 1)
372 		l &= ~(BIT(gpio));
373 	else
374 		l |= BIT(gpio);
375 
376 	writel_relaxed(l, reg);
377 }
378 #else
379 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
380 #endif
381 
382 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
383 				    unsigned trigger)
384 {
385 	void __iomem *reg = bank->base;
386 	void __iomem *base = bank->base;
387 	u32 l = 0;
388 
389 	if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
390 		omap_set_gpio_trigger(bank, gpio, trigger);
391 	} else if (bank->regs->irqctrl) {
392 		reg += bank->regs->irqctrl;
393 
394 		l = readl_relaxed(reg);
395 		if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
396 			bank->toggle_mask |= BIT(gpio);
397 		if (trigger & IRQ_TYPE_EDGE_RISING)
398 			l |= BIT(gpio);
399 		else if (trigger & IRQ_TYPE_EDGE_FALLING)
400 			l &= ~(BIT(gpio));
401 		else
402 			return -EINVAL;
403 
404 		writel_relaxed(l, reg);
405 	} else if (bank->regs->edgectrl1) {
406 		if (gpio & 0x08)
407 			reg += bank->regs->edgectrl2;
408 		else
409 			reg += bank->regs->edgectrl1;
410 
411 		gpio &= 0x07;
412 		l = readl_relaxed(reg);
413 		l &= ~(3 << (gpio << 1));
414 		if (trigger & IRQ_TYPE_EDGE_RISING)
415 			l |= 2 << (gpio << 1);
416 		if (trigger & IRQ_TYPE_EDGE_FALLING)
417 			l |= BIT(gpio << 1);
418 
419 		/* Enable wake-up during idle for dynamic tick */
420 		omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
421 		bank->context.wake_en =
422 			readl_relaxed(bank->base + bank->regs->wkup_en);
423 		writel_relaxed(l, reg);
424 	}
425 	return 0;
426 }
427 
428 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
429 {
430 	if (bank->regs->pinctrl) {
431 		void __iomem *reg = bank->base + bank->regs->pinctrl;
432 
433 		/* Claim the pin for MPU */
434 		writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
435 	}
436 
437 	if (bank->regs->ctrl && !BANK_USED(bank)) {
438 		void __iomem *reg = bank->base + bank->regs->ctrl;
439 		u32 ctrl;
440 
441 		ctrl = readl_relaxed(reg);
442 		/* Module is enabled, clocks are not gated */
443 		ctrl &= ~GPIO_MOD_CTRL_BIT;
444 		writel_relaxed(ctrl, reg);
445 		bank->context.ctrl = ctrl;
446 	}
447 }
448 
449 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
450 {
451 	void __iomem *base = bank->base;
452 
453 	if (bank->regs->wkup_en &&
454 	    !LINE_USED(bank->mod_usage, offset) &&
455 	    !LINE_USED(bank->irq_usage, offset)) {
456 		/* Disable wake-up during idle for dynamic tick */
457 		omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
458 		bank->context.wake_en =
459 			readl_relaxed(bank->base + bank->regs->wkup_en);
460 	}
461 
462 	if (bank->regs->ctrl && !BANK_USED(bank)) {
463 		void __iomem *reg = bank->base + bank->regs->ctrl;
464 		u32 ctrl;
465 
466 		ctrl = readl_relaxed(reg);
467 		/* Module is disabled, clocks are gated */
468 		ctrl |= GPIO_MOD_CTRL_BIT;
469 		writel_relaxed(ctrl, reg);
470 		bank->context.ctrl = ctrl;
471 	}
472 }
473 
474 static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
475 {
476 	void __iomem *reg = bank->base + bank->regs->direction;
477 
478 	return readl_relaxed(reg) & BIT(offset);
479 }
480 
481 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
482 {
483 	if (!LINE_USED(bank->mod_usage, offset)) {
484 		omap_enable_gpio_module(bank, offset);
485 		omap_set_gpio_direction(bank, offset, 1);
486 	}
487 	bank->irq_usage |= BIT(offset);
488 }
489 
490 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
491 {
492 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
493 	int retval;
494 	unsigned long flags;
495 	unsigned offset = d->hwirq;
496 
497 	if (type & ~IRQ_TYPE_SENSE_MASK)
498 		return -EINVAL;
499 
500 	if (!bank->regs->leveldetect0 &&
501 		(type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
502 		return -EINVAL;
503 
504 	raw_spin_lock_irqsave(&bank->lock, flags);
505 	retval = omap_set_gpio_triggering(bank, offset, type);
506 	if (retval) {
507 		raw_spin_unlock_irqrestore(&bank->lock, flags);
508 		goto error;
509 	}
510 	omap_gpio_init_irq(bank, offset);
511 	if (!omap_gpio_is_input(bank, offset)) {
512 		raw_spin_unlock_irqrestore(&bank->lock, flags);
513 		retval = -EINVAL;
514 		goto error;
515 	}
516 	raw_spin_unlock_irqrestore(&bank->lock, flags);
517 
518 	if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
519 		irq_set_handler_locked(d, handle_level_irq);
520 	else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
521 		/*
522 		 * Edge IRQs are already cleared/acked in irq_handler and
523 		 * not need to be masked, as result handle_edge_irq()
524 		 * logic is excessed here and may cause lose of interrupts.
525 		 * So just use handle_simple_irq.
526 		 */
527 		irq_set_handler_locked(d, handle_simple_irq);
528 
529 	return 0;
530 
531 error:
532 	return retval;
533 }
534 
535 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
536 {
537 	void __iomem *reg = bank->base;
538 
539 	reg += bank->regs->irqstatus;
540 	writel_relaxed(gpio_mask, reg);
541 
542 	/* Workaround for clearing DSP GPIO interrupts to allow retention */
543 	if (bank->regs->irqstatus2) {
544 		reg = bank->base + bank->regs->irqstatus2;
545 		writel_relaxed(gpio_mask, reg);
546 	}
547 
548 	/* Flush posted write for the irq status to avoid spurious interrupts */
549 	readl_relaxed(reg);
550 }
551 
552 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
553 					     unsigned offset)
554 {
555 	omap_clear_gpio_irqbank(bank, BIT(offset));
556 }
557 
558 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
559 {
560 	void __iomem *reg = bank->base;
561 	u32 l;
562 	u32 mask = (BIT(bank->width)) - 1;
563 
564 	reg += bank->regs->irqenable;
565 	l = readl_relaxed(reg);
566 	if (bank->regs->irqenable_inv)
567 		l = ~l;
568 	l &= mask;
569 	return l;
570 }
571 
572 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
573 {
574 	void __iomem *reg = bank->base;
575 	u32 l;
576 
577 	if (bank->regs->set_irqenable) {
578 		reg += bank->regs->set_irqenable;
579 		l = gpio_mask;
580 		bank->context.irqenable1 |= gpio_mask;
581 	} else {
582 		reg += bank->regs->irqenable;
583 		l = readl_relaxed(reg);
584 		if (bank->regs->irqenable_inv)
585 			l &= ~gpio_mask;
586 		else
587 			l |= gpio_mask;
588 		bank->context.irqenable1 = l;
589 	}
590 
591 	writel_relaxed(l, reg);
592 }
593 
594 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
595 {
596 	void __iomem *reg = bank->base;
597 	u32 l;
598 
599 	if (bank->regs->clr_irqenable) {
600 		reg += bank->regs->clr_irqenable;
601 		l = gpio_mask;
602 		bank->context.irqenable1 &= ~gpio_mask;
603 	} else {
604 		reg += bank->regs->irqenable;
605 		l = readl_relaxed(reg);
606 		if (bank->regs->irqenable_inv)
607 			l |= gpio_mask;
608 		else
609 			l &= ~gpio_mask;
610 		bank->context.irqenable1 = l;
611 	}
612 
613 	writel_relaxed(l, reg);
614 }
615 
616 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
617 					   unsigned offset, int enable)
618 {
619 	if (enable)
620 		omap_enable_gpio_irqbank(bank, BIT(offset));
621 	else
622 		omap_disable_gpio_irqbank(bank, BIT(offset));
623 }
624 
625 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
626 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
627 {
628 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
629 
630 	return irq_set_irq_wake(bank->irq, enable);
631 }
632 
633 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
634 {
635 	struct gpio_bank *bank = gpiochip_get_data(chip);
636 	unsigned long flags;
637 
638 	/*
639 	 * If this is the first gpio_request for the bank,
640 	 * enable the bank module.
641 	 */
642 	if (!BANK_USED(bank))
643 		pm_runtime_get_sync(chip->parent);
644 
645 	raw_spin_lock_irqsave(&bank->lock, flags);
646 	omap_enable_gpio_module(bank, offset);
647 	bank->mod_usage |= BIT(offset);
648 	raw_spin_unlock_irqrestore(&bank->lock, flags);
649 
650 	return 0;
651 }
652 
653 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
654 {
655 	struct gpio_bank *bank = gpiochip_get_data(chip);
656 	unsigned long flags;
657 
658 	raw_spin_lock_irqsave(&bank->lock, flags);
659 	bank->mod_usage &= ~(BIT(offset));
660 	if (!LINE_USED(bank->irq_usage, offset)) {
661 		omap_set_gpio_direction(bank, offset, 1);
662 		omap_clear_gpio_debounce(bank, offset);
663 	}
664 	omap_disable_gpio_module(bank, offset);
665 	raw_spin_unlock_irqrestore(&bank->lock, flags);
666 
667 	/*
668 	 * If this is the last gpio to be freed in the bank,
669 	 * disable the bank module.
670 	 */
671 	if (!BANK_USED(bank))
672 		pm_runtime_put(chip->parent);
673 }
674 
675 /*
676  * We need to unmask the GPIO bank interrupt as soon as possible to
677  * avoid missing GPIO interrupts for other lines in the bank.
678  * Then we need to mask-read-clear-unmask the triggered GPIO lines
679  * in the bank to avoid missing nested interrupts for a GPIO line.
680  * If we wait to unmask individual GPIO lines in the bank after the
681  * line's interrupt handler has been run, we may miss some nested
682  * interrupts.
683  */
684 static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
685 {
686 	void __iomem *isr_reg = NULL;
687 	u32 enabled, isr, level_mask;
688 	unsigned int bit;
689 	struct gpio_bank *bank = gpiobank;
690 	unsigned long wa_lock_flags;
691 	unsigned long lock_flags;
692 
693 	isr_reg = bank->base + bank->regs->irqstatus;
694 	if (WARN_ON(!isr_reg))
695 		goto exit;
696 
697 	pm_runtime_get_sync(bank->chip.parent);
698 
699 	while (1) {
700 		raw_spin_lock_irqsave(&bank->lock, lock_flags);
701 
702 		enabled = omap_get_gpio_irqbank_mask(bank);
703 		isr = readl_relaxed(isr_reg) & enabled;
704 
705 		if (bank->level_mask)
706 			level_mask = bank->level_mask & enabled;
707 		else
708 			level_mask = 0;
709 
710 		/* clear edge sensitive interrupts before handler(s) are
711 		called so that we don't miss any interrupt occurred while
712 		executing them */
713 		if (isr & ~level_mask)
714 			omap_clear_gpio_irqbank(bank, isr & ~level_mask);
715 
716 		raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
717 
718 		if (!isr)
719 			break;
720 
721 		while (isr) {
722 			bit = __ffs(isr);
723 			isr &= ~(BIT(bit));
724 
725 			raw_spin_lock_irqsave(&bank->lock, lock_flags);
726 			/*
727 			 * Some chips can't respond to both rising and falling
728 			 * at the same time.  If this irq was requested with
729 			 * both flags, we need to flip the ICR data for the IRQ
730 			 * to respond to the IRQ for the opposite direction.
731 			 * This will be indicated in the bank toggle_mask.
732 			 */
733 			if (bank->toggle_mask & (BIT(bit)))
734 				omap_toggle_gpio_edge_triggering(bank, bit);
735 
736 			raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
737 
738 			raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
739 
740 			generic_handle_irq(irq_find_mapping(bank->chip.irq.domain,
741 							    bit));
742 
743 			raw_spin_unlock_irqrestore(&bank->wa_lock,
744 						   wa_lock_flags);
745 		}
746 	}
747 exit:
748 	pm_runtime_put(bank->chip.parent);
749 	return IRQ_HANDLED;
750 }
751 
752 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
753 {
754 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
755 	unsigned long flags;
756 	unsigned offset = d->hwirq;
757 
758 	raw_spin_lock_irqsave(&bank->lock, flags);
759 
760 	if (!LINE_USED(bank->mod_usage, offset))
761 		omap_set_gpio_direction(bank, offset, 1);
762 	else if (!omap_gpio_is_input(bank, offset))
763 		goto err;
764 	omap_enable_gpio_module(bank, offset);
765 	bank->irq_usage |= BIT(offset);
766 
767 	raw_spin_unlock_irqrestore(&bank->lock, flags);
768 	omap_gpio_unmask_irq(d);
769 
770 	return 0;
771 err:
772 	raw_spin_unlock_irqrestore(&bank->lock, flags);
773 	return -EINVAL;
774 }
775 
776 static void omap_gpio_irq_shutdown(struct irq_data *d)
777 {
778 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
779 	unsigned long flags;
780 	unsigned offset = d->hwirq;
781 
782 	raw_spin_lock_irqsave(&bank->lock, flags);
783 	bank->irq_usage &= ~(BIT(offset));
784 	omap_set_gpio_irqenable(bank, offset, 0);
785 	omap_clear_gpio_irqstatus(bank, offset);
786 	omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
787 	if (!LINE_USED(bank->mod_usage, offset))
788 		omap_clear_gpio_debounce(bank, offset);
789 	omap_disable_gpio_module(bank, offset);
790 	raw_spin_unlock_irqrestore(&bank->lock, flags);
791 }
792 
793 static void omap_gpio_irq_bus_lock(struct irq_data *data)
794 {
795 	struct gpio_bank *bank = omap_irq_data_get_bank(data);
796 
797 	if (!BANK_USED(bank))
798 		pm_runtime_get_sync(bank->chip.parent);
799 }
800 
801 static void gpio_irq_bus_sync_unlock(struct irq_data *data)
802 {
803 	struct gpio_bank *bank = omap_irq_data_get_bank(data);
804 
805 	/*
806 	 * If this is the last IRQ to be freed in the bank,
807 	 * disable the bank module.
808 	 */
809 	if (!BANK_USED(bank))
810 		pm_runtime_put(bank->chip.parent);
811 }
812 
813 static void omap_gpio_ack_irq(struct irq_data *d)
814 {
815 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
816 	unsigned offset = d->hwirq;
817 
818 	omap_clear_gpio_irqstatus(bank, offset);
819 }
820 
821 static void omap_gpio_mask_irq(struct irq_data *d)
822 {
823 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
824 	unsigned offset = d->hwirq;
825 	unsigned long flags;
826 
827 	raw_spin_lock_irqsave(&bank->lock, flags);
828 	omap_set_gpio_irqenable(bank, offset, 0);
829 	omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
830 	raw_spin_unlock_irqrestore(&bank->lock, flags);
831 }
832 
833 static void omap_gpio_unmask_irq(struct irq_data *d)
834 {
835 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
836 	unsigned offset = d->hwirq;
837 	u32 trigger = irqd_get_trigger_type(d);
838 	unsigned long flags;
839 
840 	raw_spin_lock_irqsave(&bank->lock, flags);
841 	if (trigger)
842 		omap_set_gpio_triggering(bank, offset, trigger);
843 
844 	/* For level-triggered GPIOs, the clearing must be done after
845 	 * the HW source is cleared, thus after the handler has run */
846 	if (bank->level_mask & BIT(offset)) {
847 		omap_set_gpio_irqenable(bank, offset, 0);
848 		omap_clear_gpio_irqstatus(bank, offset);
849 	}
850 
851 	omap_set_gpio_irqenable(bank, offset, 1);
852 	raw_spin_unlock_irqrestore(&bank->lock, flags);
853 }
854 
855 /*---------------------------------------------------------------------*/
856 
857 static int omap_mpuio_suspend_noirq(struct device *dev)
858 {
859 	struct platform_device *pdev = to_platform_device(dev);
860 	struct gpio_bank	*bank = platform_get_drvdata(pdev);
861 	void __iomem		*mask_reg = bank->base +
862 					OMAP_MPUIO_GPIO_MASKIT / bank->stride;
863 	unsigned long		flags;
864 
865 	raw_spin_lock_irqsave(&bank->lock, flags);
866 	writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
867 	raw_spin_unlock_irqrestore(&bank->lock, flags);
868 
869 	return 0;
870 }
871 
872 static int omap_mpuio_resume_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 	raw_spin_lock_irqsave(&bank->lock, flags);
881 	writel_relaxed(bank->context.wake_en, mask_reg);
882 	raw_spin_unlock_irqrestore(&bank->lock, flags);
883 
884 	return 0;
885 }
886 
887 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
888 	.suspend_noirq = omap_mpuio_suspend_noirq,
889 	.resume_noirq = omap_mpuio_resume_noirq,
890 };
891 
892 /* use platform_driver for this. */
893 static struct platform_driver omap_mpuio_driver = {
894 	.driver		= {
895 		.name	= "mpuio",
896 		.pm	= &omap_mpuio_dev_pm_ops,
897 	},
898 };
899 
900 static struct platform_device omap_mpuio_device = {
901 	.name		= "mpuio",
902 	.id		= -1,
903 	.dev = {
904 		.driver = &omap_mpuio_driver.driver,
905 	}
906 	/* could list the /proc/iomem resources */
907 };
908 
909 static inline void omap_mpuio_init(struct gpio_bank *bank)
910 {
911 	platform_set_drvdata(&omap_mpuio_device, bank);
912 
913 	if (platform_driver_register(&omap_mpuio_driver) == 0)
914 		(void) platform_device_register(&omap_mpuio_device);
915 }
916 
917 /*---------------------------------------------------------------------*/
918 
919 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
920 {
921 	struct gpio_bank *bank;
922 	unsigned long flags;
923 	void __iomem *reg;
924 	int dir;
925 
926 	bank = gpiochip_get_data(chip);
927 	reg = bank->base + bank->regs->direction;
928 	raw_spin_lock_irqsave(&bank->lock, flags);
929 	dir = !!(readl_relaxed(reg) & BIT(offset));
930 	raw_spin_unlock_irqrestore(&bank->lock, flags);
931 	return dir;
932 }
933 
934 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
935 {
936 	struct gpio_bank *bank;
937 	unsigned long flags;
938 
939 	bank = gpiochip_get_data(chip);
940 	raw_spin_lock_irqsave(&bank->lock, flags);
941 	omap_set_gpio_direction(bank, offset, 1);
942 	raw_spin_unlock_irqrestore(&bank->lock, flags);
943 	return 0;
944 }
945 
946 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
947 {
948 	struct gpio_bank *bank;
949 
950 	bank = gpiochip_get_data(chip);
951 
952 	if (omap_gpio_is_input(bank, offset))
953 		return omap_get_gpio_datain(bank, offset);
954 	else
955 		return omap_get_gpio_dataout(bank, offset);
956 }
957 
958 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
959 {
960 	struct gpio_bank *bank;
961 	unsigned long flags;
962 
963 	bank = gpiochip_get_data(chip);
964 	raw_spin_lock_irqsave(&bank->lock, flags);
965 	bank->set_dataout(bank, offset, value);
966 	omap_set_gpio_direction(bank, offset, 0);
967 	raw_spin_unlock_irqrestore(&bank->lock, flags);
968 	return 0;
969 }
970 
971 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
972 			      unsigned debounce)
973 {
974 	struct gpio_bank *bank;
975 	unsigned long flags;
976 	int ret;
977 
978 	bank = gpiochip_get_data(chip);
979 
980 	raw_spin_lock_irqsave(&bank->lock, flags);
981 	ret = omap2_set_gpio_debounce(bank, offset, debounce);
982 	raw_spin_unlock_irqrestore(&bank->lock, flags);
983 
984 	if (ret)
985 		dev_info(chip->parent,
986 			 "Could not set line %u debounce to %u microseconds (%d)",
987 			 offset, debounce, ret);
988 
989 	return ret;
990 }
991 
992 static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
993 				unsigned long config)
994 {
995 	u32 debounce;
996 
997 	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
998 		return -ENOTSUPP;
999 
1000 	debounce = pinconf_to_config_argument(config);
1001 	return omap_gpio_debounce(chip, offset, debounce);
1002 }
1003 
1004 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1005 {
1006 	struct gpio_bank *bank;
1007 	unsigned long flags;
1008 
1009 	bank = gpiochip_get_data(chip);
1010 	raw_spin_lock_irqsave(&bank->lock, flags);
1011 	bank->set_dataout(bank, offset, value);
1012 	raw_spin_unlock_irqrestore(&bank->lock, flags);
1013 }
1014 
1015 /*---------------------------------------------------------------------*/
1016 
1017 static void omap_gpio_show_rev(struct gpio_bank *bank)
1018 {
1019 	static bool called;
1020 	u32 rev;
1021 
1022 	if (called || bank->regs->revision == USHRT_MAX)
1023 		return;
1024 
1025 	rev = readw_relaxed(bank->base + bank->regs->revision);
1026 	pr_info("OMAP GPIO hardware version %d.%d\n",
1027 		(rev >> 4) & 0x0f, rev & 0x0f);
1028 
1029 	called = true;
1030 }
1031 
1032 static void omap_gpio_mod_init(struct gpio_bank *bank)
1033 {
1034 	void __iomem *base = bank->base;
1035 	u32 l = 0xffffffff;
1036 
1037 	if (bank->width == 16)
1038 		l = 0xffff;
1039 
1040 	if (bank->is_mpuio) {
1041 		writel_relaxed(l, bank->base + bank->regs->irqenable);
1042 		return;
1043 	}
1044 
1045 	omap_gpio_rmw(base, bank->regs->irqenable, l,
1046 		      bank->regs->irqenable_inv);
1047 	omap_gpio_rmw(base, bank->regs->irqstatus, l,
1048 		      !bank->regs->irqenable_inv);
1049 	if (bank->regs->debounce_en)
1050 		writel_relaxed(0, base + bank->regs->debounce_en);
1051 
1052 	/* Save OE default value (0xffffffff) in the context */
1053 	bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1054 	 /* Initialize interface clk ungated, module enabled */
1055 	if (bank->regs->ctrl)
1056 		writel_relaxed(0, base + bank->regs->ctrl);
1057 }
1058 
1059 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1060 {
1061 	static int gpio;
1062 	int irq_base = 0;
1063 	int ret;
1064 
1065 	/*
1066 	 * REVISIT eventually switch from OMAP-specific gpio structs
1067 	 * over to the generic ones
1068 	 */
1069 	bank->chip.request = omap_gpio_request;
1070 	bank->chip.free = omap_gpio_free;
1071 	bank->chip.get_direction = omap_gpio_get_direction;
1072 	bank->chip.direction_input = omap_gpio_input;
1073 	bank->chip.get = omap_gpio_get;
1074 	bank->chip.direction_output = omap_gpio_output;
1075 	bank->chip.set_config = omap_gpio_set_config;
1076 	bank->chip.set = omap_gpio_set;
1077 	if (bank->is_mpuio) {
1078 		bank->chip.label = "mpuio";
1079 		if (bank->regs->wkup_en)
1080 			bank->chip.parent = &omap_mpuio_device.dev;
1081 		bank->chip.base = OMAP_MPUIO(0);
1082 	} else {
1083 		bank->chip.label = "gpio";
1084 		bank->chip.base = gpio;
1085 	}
1086 	bank->chip.ngpio = bank->width;
1087 
1088 	ret = gpiochip_add_data(&bank->chip, bank);
1089 	if (ret) {
1090 		dev_err(bank->chip.parent,
1091 			"Could not register gpio chip %d\n", ret);
1092 		return ret;
1093 	}
1094 
1095 	if (!bank->is_mpuio)
1096 		gpio += bank->width;
1097 
1098 #ifdef CONFIG_ARCH_OMAP1
1099 	/*
1100 	 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1101 	 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1102 	 */
1103 	irq_base = devm_irq_alloc_descs(bank->chip.parent,
1104 					-1, 0, bank->width, 0);
1105 	if (irq_base < 0) {
1106 		dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n");
1107 		return -ENODEV;
1108 	}
1109 #endif
1110 
1111 	/* MPUIO is a bit different, reading IRQ status clears it */
1112 	if (bank->is_mpuio) {
1113 		irqc->irq_ack = dummy_irq_chip.irq_ack;
1114 		if (!bank->regs->wkup_en)
1115 			irqc->irq_set_wake = NULL;
1116 	}
1117 
1118 	ret = gpiochip_irqchip_add(&bank->chip, irqc,
1119 				   irq_base, handle_bad_irq,
1120 				   IRQ_TYPE_NONE);
1121 
1122 	if (ret) {
1123 		dev_err(bank->chip.parent,
1124 			"Couldn't add irqchip to gpiochip %d\n", ret);
1125 		gpiochip_remove(&bank->chip);
1126 		return -ENODEV;
1127 	}
1128 
1129 	gpiochip_set_chained_irqchip(&bank->chip, irqc, bank->irq, NULL);
1130 
1131 	ret = devm_request_irq(bank->chip.parent, bank->irq,
1132 			       omap_gpio_irq_handler,
1133 			       0, dev_name(bank->chip.parent), bank);
1134 	if (ret)
1135 		gpiochip_remove(&bank->chip);
1136 
1137 	return ret;
1138 }
1139 
1140 static const struct of_device_id omap_gpio_match[];
1141 
1142 static int omap_gpio_probe(struct platform_device *pdev)
1143 {
1144 	struct device *dev = &pdev->dev;
1145 	struct device_node *node = dev->of_node;
1146 	const struct of_device_id *match;
1147 	const struct omap_gpio_platform_data *pdata;
1148 	struct resource *res;
1149 	struct gpio_bank *bank;
1150 	struct irq_chip *irqc;
1151 	int ret;
1152 
1153 	match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1154 
1155 	pdata = match ? match->data : dev_get_platdata(dev);
1156 	if (!pdata)
1157 		return -EINVAL;
1158 
1159 	bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1160 	if (!bank) {
1161 		dev_err(dev, "Memory alloc failed\n");
1162 		return -ENOMEM;
1163 	}
1164 
1165 	irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1166 	if (!irqc)
1167 		return -ENOMEM;
1168 
1169 	irqc->irq_startup = omap_gpio_irq_startup,
1170 	irqc->irq_shutdown = omap_gpio_irq_shutdown,
1171 	irqc->irq_ack = omap_gpio_ack_irq,
1172 	irqc->irq_mask = omap_gpio_mask_irq,
1173 	irqc->irq_unmask = omap_gpio_unmask_irq,
1174 	irqc->irq_set_type = omap_gpio_irq_type,
1175 	irqc->irq_set_wake = omap_gpio_wake_enable,
1176 	irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1177 	irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1178 	irqc->name = dev_name(&pdev->dev);
1179 	irqc->flags = IRQCHIP_MASK_ON_SUSPEND;
1180 
1181 	bank->irq = platform_get_irq(pdev, 0);
1182 	if (bank->irq <= 0) {
1183 		if (!bank->irq)
1184 			bank->irq = -ENXIO;
1185 		if (bank->irq != -EPROBE_DEFER)
1186 			dev_err(dev,
1187 				"can't get irq resource ret=%d\n", bank->irq);
1188 		return bank->irq;
1189 	}
1190 
1191 	bank->chip.parent = dev;
1192 	bank->chip.owner = THIS_MODULE;
1193 	bank->dbck_flag = pdata->dbck_flag;
1194 	bank->stride = pdata->bank_stride;
1195 	bank->width = pdata->bank_width;
1196 	bank->is_mpuio = pdata->is_mpuio;
1197 	bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1198 	bank->regs = pdata->regs;
1199 #ifdef CONFIG_OF_GPIO
1200 	bank->chip.of_node = of_node_get(node);
1201 #endif
1202 	if (node) {
1203 		if (!of_property_read_bool(node, "ti,gpio-always-on"))
1204 			bank->loses_context = true;
1205 	} else {
1206 		bank->loses_context = pdata->loses_context;
1207 
1208 		if (bank->loses_context)
1209 			bank->get_context_loss_count =
1210 				pdata->get_context_loss_count;
1211 	}
1212 
1213 	if (bank->regs->set_dataout && bank->regs->clr_dataout)
1214 		bank->set_dataout = omap_set_gpio_dataout_reg;
1215 	else
1216 		bank->set_dataout = omap_set_gpio_dataout_mask;
1217 
1218 	raw_spin_lock_init(&bank->lock);
1219 	raw_spin_lock_init(&bank->wa_lock);
1220 
1221 	/* Static mapping, never released */
1222 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1223 	bank->base = devm_ioremap_resource(dev, res);
1224 	if (IS_ERR(bank->base)) {
1225 		return PTR_ERR(bank->base);
1226 	}
1227 
1228 	if (bank->dbck_flag) {
1229 		bank->dbck = devm_clk_get(dev, "dbclk");
1230 		if (IS_ERR(bank->dbck)) {
1231 			dev_err(dev,
1232 				"Could not get gpio dbck. Disable debounce\n");
1233 			bank->dbck_flag = false;
1234 		} else {
1235 			clk_prepare(bank->dbck);
1236 		}
1237 	}
1238 
1239 	platform_set_drvdata(pdev, bank);
1240 
1241 	pm_runtime_enable(dev);
1242 	pm_runtime_irq_safe(dev);
1243 	pm_runtime_get_sync(dev);
1244 
1245 	if (bank->is_mpuio)
1246 		omap_mpuio_init(bank);
1247 
1248 	omap_gpio_mod_init(bank);
1249 
1250 	ret = omap_gpio_chip_init(bank, irqc);
1251 	if (ret) {
1252 		pm_runtime_put_sync(dev);
1253 		pm_runtime_disable(dev);
1254 		if (bank->dbck_flag)
1255 			clk_unprepare(bank->dbck);
1256 		return ret;
1257 	}
1258 
1259 	omap_gpio_show_rev(bank);
1260 
1261 	pm_runtime_put(dev);
1262 
1263 	list_add_tail(&bank->node, &omap_gpio_list);
1264 
1265 	return 0;
1266 }
1267 
1268 static int omap_gpio_remove(struct platform_device *pdev)
1269 {
1270 	struct gpio_bank *bank = platform_get_drvdata(pdev);
1271 
1272 	list_del(&bank->node);
1273 	gpiochip_remove(&bank->chip);
1274 	pm_runtime_disable(&pdev->dev);
1275 	if (bank->dbck_flag)
1276 		clk_unprepare(bank->dbck);
1277 
1278 	return 0;
1279 }
1280 
1281 #ifdef CONFIG_ARCH_OMAP2PLUS
1282 
1283 #if defined(CONFIG_PM)
1284 static void omap_gpio_restore_context(struct gpio_bank *bank);
1285 
1286 static int omap_gpio_runtime_suspend(struct device *dev)
1287 {
1288 	struct platform_device *pdev = to_platform_device(dev);
1289 	struct gpio_bank *bank = platform_get_drvdata(pdev);
1290 	u32 l1 = 0, l2 = 0;
1291 	unsigned long flags;
1292 	u32 wake_low, wake_hi;
1293 
1294 	raw_spin_lock_irqsave(&bank->lock, flags);
1295 
1296 	/*
1297 	 * Only edges can generate a wakeup event to the PRCM.
1298 	 *
1299 	 * Therefore, ensure any wake-up capable GPIOs have
1300 	 * edge-detection enabled before going idle to ensure a wakeup
1301 	 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1302 	 * NDA TRM 25.5.3.1)
1303 	 *
1304 	 * The normal values will be restored upon ->runtime_resume()
1305 	 * by writing back the values saved in bank->context.
1306 	 */
1307 	wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1308 	if (wake_low)
1309 		writel_relaxed(wake_low | bank->context.fallingdetect,
1310 			     bank->base + bank->regs->fallingdetect);
1311 	wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1312 	if (wake_hi)
1313 		writel_relaxed(wake_hi | bank->context.risingdetect,
1314 			     bank->base + bank->regs->risingdetect);
1315 
1316 	if (!bank->enabled_non_wakeup_gpios)
1317 		goto update_gpio_context_count;
1318 
1319 	if (bank->power_mode != OFF_MODE) {
1320 		bank->power_mode = 0;
1321 		goto update_gpio_context_count;
1322 	}
1323 	/*
1324 	 * If going to OFF, remove triggering for all
1325 	 * non-wakeup GPIOs.  Otherwise spurious IRQs will be
1326 	 * generated.  See OMAP2420 Errata item 1.101.
1327 	 */
1328 	bank->saved_datain = readl_relaxed(bank->base +
1329 						bank->regs->datain);
1330 	l1 = bank->context.fallingdetect;
1331 	l2 = bank->context.risingdetect;
1332 
1333 	l1 &= ~bank->enabled_non_wakeup_gpios;
1334 	l2 &= ~bank->enabled_non_wakeup_gpios;
1335 
1336 	writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1337 	writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1338 
1339 	bank->workaround_enabled = true;
1340 
1341 update_gpio_context_count:
1342 	if (bank->get_context_loss_count)
1343 		bank->context_loss_count =
1344 				bank->get_context_loss_count(dev);
1345 
1346 	omap_gpio_dbck_disable(bank);
1347 	raw_spin_unlock_irqrestore(&bank->lock, flags);
1348 
1349 	return 0;
1350 }
1351 
1352 static void omap_gpio_init_context(struct gpio_bank *p);
1353 
1354 static int omap_gpio_runtime_resume(struct device *dev)
1355 {
1356 	struct platform_device *pdev = to_platform_device(dev);
1357 	struct gpio_bank *bank = platform_get_drvdata(pdev);
1358 	u32 l = 0, gen, gen0, gen1;
1359 	unsigned long flags;
1360 	int c;
1361 
1362 	raw_spin_lock_irqsave(&bank->lock, flags);
1363 
1364 	/*
1365 	 * On the first resume during the probe, the context has not
1366 	 * been initialised and so initialise it now. Also initialise
1367 	 * the context loss count.
1368 	 */
1369 	if (bank->loses_context && !bank->context_valid) {
1370 		omap_gpio_init_context(bank);
1371 
1372 		if (bank->get_context_loss_count)
1373 			bank->context_loss_count =
1374 				bank->get_context_loss_count(dev);
1375 	}
1376 
1377 	omap_gpio_dbck_enable(bank);
1378 
1379 	/*
1380 	 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1381 	 * GPIOs were set to edge trigger also in order to be able to
1382 	 * generate a PRCM wakeup.  Here we restore the
1383 	 * pre-runtime_suspend() values for edge triggering.
1384 	 */
1385 	writel_relaxed(bank->context.fallingdetect,
1386 		     bank->base + bank->regs->fallingdetect);
1387 	writel_relaxed(bank->context.risingdetect,
1388 		     bank->base + bank->regs->risingdetect);
1389 
1390 	if (bank->loses_context) {
1391 		if (!bank->get_context_loss_count) {
1392 			omap_gpio_restore_context(bank);
1393 		} else {
1394 			c = bank->get_context_loss_count(dev);
1395 			if (c != bank->context_loss_count) {
1396 				omap_gpio_restore_context(bank);
1397 			} else {
1398 				raw_spin_unlock_irqrestore(&bank->lock, flags);
1399 				return 0;
1400 			}
1401 		}
1402 	}
1403 
1404 	if (!bank->workaround_enabled) {
1405 		raw_spin_unlock_irqrestore(&bank->lock, flags);
1406 		return 0;
1407 	}
1408 
1409 	l = readl_relaxed(bank->base + bank->regs->datain);
1410 
1411 	/*
1412 	 * Check if any of the non-wakeup interrupt GPIOs have changed
1413 	 * state.  If so, generate an IRQ by software.  This is
1414 	 * horribly racy, but it's the best we can do to work around
1415 	 * this silicon bug.
1416 	 */
1417 	l ^= bank->saved_datain;
1418 	l &= bank->enabled_non_wakeup_gpios;
1419 
1420 	/*
1421 	 * No need to generate IRQs for the rising edge for gpio IRQs
1422 	 * configured with falling edge only; and vice versa.
1423 	 */
1424 	gen0 = l & bank->context.fallingdetect;
1425 	gen0 &= bank->saved_datain;
1426 
1427 	gen1 = l & bank->context.risingdetect;
1428 	gen1 &= ~(bank->saved_datain);
1429 
1430 	/* FIXME: Consider GPIO IRQs with level detections properly! */
1431 	gen = l & (~(bank->context.fallingdetect) &
1432 					 ~(bank->context.risingdetect));
1433 	/* Consider all GPIO IRQs needed to be updated */
1434 	gen |= gen0 | gen1;
1435 
1436 	if (gen) {
1437 		u32 old0, old1;
1438 
1439 		old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1440 		old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1441 
1442 		if (!bank->regs->irqstatus_raw0) {
1443 			writel_relaxed(old0 | gen, bank->base +
1444 						bank->regs->leveldetect0);
1445 			writel_relaxed(old1 | gen, bank->base +
1446 						bank->regs->leveldetect1);
1447 		}
1448 
1449 		if (bank->regs->irqstatus_raw0) {
1450 			writel_relaxed(old0 | l, bank->base +
1451 						bank->regs->leveldetect0);
1452 			writel_relaxed(old1 | l, bank->base +
1453 						bank->regs->leveldetect1);
1454 		}
1455 		writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1456 		writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1457 	}
1458 
1459 	bank->workaround_enabled = false;
1460 	raw_spin_unlock_irqrestore(&bank->lock, flags);
1461 
1462 	return 0;
1463 }
1464 #endif /* CONFIG_PM */
1465 
1466 #if IS_BUILTIN(CONFIG_GPIO_OMAP)
1467 void omap2_gpio_prepare_for_idle(int pwr_mode)
1468 {
1469 	struct gpio_bank *bank;
1470 
1471 	list_for_each_entry(bank, &omap_gpio_list, node) {
1472 		if (!BANK_USED(bank) || !bank->loses_context)
1473 			continue;
1474 
1475 		bank->power_mode = pwr_mode;
1476 
1477 		pm_runtime_put_sync_suspend(bank->chip.parent);
1478 	}
1479 }
1480 
1481 void omap2_gpio_resume_after_idle(void)
1482 {
1483 	struct gpio_bank *bank;
1484 
1485 	list_for_each_entry(bank, &omap_gpio_list, node) {
1486 		if (!BANK_USED(bank) || !bank->loses_context)
1487 			continue;
1488 
1489 		pm_runtime_get_sync(bank->chip.parent);
1490 	}
1491 }
1492 #endif
1493 
1494 #if defined(CONFIG_PM)
1495 static void omap_gpio_init_context(struct gpio_bank *p)
1496 {
1497 	struct omap_gpio_reg_offs *regs = p->regs;
1498 	void __iomem *base = p->base;
1499 
1500 	p->context.ctrl		= readl_relaxed(base + regs->ctrl);
1501 	p->context.oe		= readl_relaxed(base + regs->direction);
1502 	p->context.wake_en	= readl_relaxed(base + regs->wkup_en);
1503 	p->context.leveldetect0	= readl_relaxed(base + regs->leveldetect0);
1504 	p->context.leveldetect1	= readl_relaxed(base + regs->leveldetect1);
1505 	p->context.risingdetect	= readl_relaxed(base + regs->risingdetect);
1506 	p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1507 	p->context.irqenable1	= readl_relaxed(base + regs->irqenable);
1508 	p->context.irqenable2	= readl_relaxed(base + regs->irqenable2);
1509 
1510 	if (regs->set_dataout && p->regs->clr_dataout)
1511 		p->context.dataout = readl_relaxed(base + regs->set_dataout);
1512 	else
1513 		p->context.dataout = readl_relaxed(base + regs->dataout);
1514 
1515 	p->context_valid = true;
1516 }
1517 
1518 static void omap_gpio_restore_context(struct gpio_bank *bank)
1519 {
1520 	writel_relaxed(bank->context.wake_en,
1521 				bank->base + bank->regs->wkup_en);
1522 	writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1523 	writel_relaxed(bank->context.leveldetect0,
1524 				bank->base + bank->regs->leveldetect0);
1525 	writel_relaxed(bank->context.leveldetect1,
1526 				bank->base + bank->regs->leveldetect1);
1527 	writel_relaxed(bank->context.risingdetect,
1528 				bank->base + bank->regs->risingdetect);
1529 	writel_relaxed(bank->context.fallingdetect,
1530 				bank->base + bank->regs->fallingdetect);
1531 	if (bank->regs->set_dataout && bank->regs->clr_dataout)
1532 		writel_relaxed(bank->context.dataout,
1533 				bank->base + bank->regs->set_dataout);
1534 	else
1535 		writel_relaxed(bank->context.dataout,
1536 				bank->base + bank->regs->dataout);
1537 	writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1538 
1539 	if (bank->dbck_enable_mask) {
1540 		writel_relaxed(bank->context.debounce, bank->base +
1541 					bank->regs->debounce);
1542 		writel_relaxed(bank->context.debounce_en,
1543 					bank->base + bank->regs->debounce_en);
1544 	}
1545 
1546 	writel_relaxed(bank->context.irqenable1,
1547 				bank->base + bank->regs->irqenable);
1548 	writel_relaxed(bank->context.irqenable2,
1549 				bank->base + bank->regs->irqenable2);
1550 }
1551 #endif /* CONFIG_PM */
1552 #else
1553 #define omap_gpio_runtime_suspend NULL
1554 #define omap_gpio_runtime_resume NULL
1555 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1556 #endif
1557 
1558 static const struct dev_pm_ops gpio_pm_ops = {
1559 	SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1560 									NULL)
1561 };
1562 
1563 #if defined(CONFIG_OF)
1564 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1565 	.revision =		OMAP24XX_GPIO_REVISION,
1566 	.direction =		OMAP24XX_GPIO_OE,
1567 	.datain =		OMAP24XX_GPIO_DATAIN,
1568 	.dataout =		OMAP24XX_GPIO_DATAOUT,
1569 	.set_dataout =		OMAP24XX_GPIO_SETDATAOUT,
1570 	.clr_dataout =		OMAP24XX_GPIO_CLEARDATAOUT,
1571 	.irqstatus =		OMAP24XX_GPIO_IRQSTATUS1,
1572 	.irqstatus2 =		OMAP24XX_GPIO_IRQSTATUS2,
1573 	.irqenable =		OMAP24XX_GPIO_IRQENABLE1,
1574 	.irqenable2 =		OMAP24XX_GPIO_IRQENABLE2,
1575 	.set_irqenable =	OMAP24XX_GPIO_SETIRQENABLE1,
1576 	.clr_irqenable =	OMAP24XX_GPIO_CLEARIRQENABLE1,
1577 	.debounce =		OMAP24XX_GPIO_DEBOUNCE_VAL,
1578 	.debounce_en =		OMAP24XX_GPIO_DEBOUNCE_EN,
1579 	.ctrl =			OMAP24XX_GPIO_CTRL,
1580 	.wkup_en =		OMAP24XX_GPIO_WAKE_EN,
1581 	.leveldetect0 =		OMAP24XX_GPIO_LEVELDETECT0,
1582 	.leveldetect1 =		OMAP24XX_GPIO_LEVELDETECT1,
1583 	.risingdetect =		OMAP24XX_GPIO_RISINGDETECT,
1584 	.fallingdetect =	OMAP24XX_GPIO_FALLINGDETECT,
1585 };
1586 
1587 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1588 	.revision =		OMAP4_GPIO_REVISION,
1589 	.direction =		OMAP4_GPIO_OE,
1590 	.datain =		OMAP4_GPIO_DATAIN,
1591 	.dataout =		OMAP4_GPIO_DATAOUT,
1592 	.set_dataout =		OMAP4_GPIO_SETDATAOUT,
1593 	.clr_dataout =		OMAP4_GPIO_CLEARDATAOUT,
1594 	.irqstatus =		OMAP4_GPIO_IRQSTATUS0,
1595 	.irqstatus2 =		OMAP4_GPIO_IRQSTATUS1,
1596 	.irqenable =		OMAP4_GPIO_IRQSTATUSSET0,
1597 	.irqenable2 =		OMAP4_GPIO_IRQSTATUSSET1,
1598 	.set_irqenable =	OMAP4_GPIO_IRQSTATUSSET0,
1599 	.clr_irqenable =	OMAP4_GPIO_IRQSTATUSCLR0,
1600 	.debounce =		OMAP4_GPIO_DEBOUNCINGTIME,
1601 	.debounce_en =		OMAP4_GPIO_DEBOUNCENABLE,
1602 	.ctrl =			OMAP4_GPIO_CTRL,
1603 	.wkup_en =		OMAP4_GPIO_IRQWAKEN0,
1604 	.leveldetect0 =		OMAP4_GPIO_LEVELDETECT0,
1605 	.leveldetect1 =		OMAP4_GPIO_LEVELDETECT1,
1606 	.risingdetect =		OMAP4_GPIO_RISINGDETECT,
1607 	.fallingdetect =	OMAP4_GPIO_FALLINGDETECT,
1608 };
1609 
1610 static const struct omap_gpio_platform_data omap2_pdata = {
1611 	.regs = &omap2_gpio_regs,
1612 	.bank_width = 32,
1613 	.dbck_flag = false,
1614 };
1615 
1616 static const struct omap_gpio_platform_data omap3_pdata = {
1617 	.regs = &omap2_gpio_regs,
1618 	.bank_width = 32,
1619 	.dbck_flag = true,
1620 };
1621 
1622 static const struct omap_gpio_platform_data omap4_pdata = {
1623 	.regs = &omap4_gpio_regs,
1624 	.bank_width = 32,
1625 	.dbck_flag = true,
1626 };
1627 
1628 static const struct of_device_id omap_gpio_match[] = {
1629 	{
1630 		.compatible = "ti,omap4-gpio",
1631 		.data = &omap4_pdata,
1632 	},
1633 	{
1634 		.compatible = "ti,omap3-gpio",
1635 		.data = &omap3_pdata,
1636 	},
1637 	{
1638 		.compatible = "ti,omap2-gpio",
1639 		.data = &omap2_pdata,
1640 	},
1641 	{ },
1642 };
1643 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1644 #endif
1645 
1646 static struct platform_driver omap_gpio_driver = {
1647 	.probe		= omap_gpio_probe,
1648 	.remove		= omap_gpio_remove,
1649 	.driver		= {
1650 		.name	= "omap_gpio",
1651 		.pm	= &gpio_pm_ops,
1652 		.of_match_table = of_match_ptr(omap_gpio_match),
1653 	},
1654 };
1655 
1656 /*
1657  * gpio driver register needs to be done before
1658  * machine_init functions access gpio APIs.
1659  * Hence omap_gpio_drv_reg() is a postcore_initcall.
1660  */
1661 static int __init omap_gpio_drv_reg(void)
1662 {
1663 	return platform_driver_register(&omap_gpio_driver);
1664 }
1665 postcore_initcall(omap_gpio_drv_reg);
1666 
1667 static void __exit omap_gpio_exit(void)
1668 {
1669 	platform_driver_unregister(&omap_gpio_driver);
1670 }
1671 module_exit(omap_gpio_exit);
1672 
1673 MODULE_DESCRIPTION("omap gpio driver");
1674 MODULE_ALIAS("platform:gpio-omap");
1675 MODULE_LICENSE("GPL v2");
1676