1 // SPDX-License-Identifier: GPL-2.0-only
3 * Support functions for OMAP GPIO
5 * Copyright (C) 2003-2005 Nokia Corporation
6 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/seq_file.h>
16 #include <linux/syscore_ops.h>
17 #include <linux/err.h>
18 #include <linux/clk.h>
20 #include <linux/cpu_pm.h>
21 #include <linux/device.h>
22 #include <linux/pm_runtime.h>
25 #include <linux/gpio/driver.h>
26 #include <linux/bitops.h>
27 #include <linux/platform_data/gpio-omap.h>
29 #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
49 const struct omap_gpio_reg_offs *regs;
54 u32 enabled_non_wakeup_gpios;
55 struct gpio_regs context;
60 raw_spinlock_t wa_lock;
61 struct gpio_chip chip;
63 struct notifier_block nb;
64 unsigned int is_suspended:1;
65 unsigned int needs_resume:1;
76 int context_loss_count;
78 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
79 int (*get_context_loss_count)(struct device *dev);
82 #define GPIO_MOD_CTRL_BIT BIT(0)
84 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
85 #define LINE_USED(line, offset) (line & (BIT(offset)))
87 static void omap_gpio_unmask_irq(struct irq_data *d);
89 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
91 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
92 return gpiochip_get_data(chip);
95 static inline u32 omap_gpio_rmw(void __iomem *reg, u32 mask, bool set)
97 u32 val = readl_relaxed(reg);
104 writel_relaxed(val, reg);
109 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
112 bank->context.oe = omap_gpio_rmw(bank->base + bank->regs->direction,
113 BIT(gpio), is_input);
117 /* set data out value using dedicate set/clear register */
118 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
121 void __iomem *reg = bank->base;
125 reg += bank->regs->set_dataout;
126 bank->context.dataout |= l;
128 reg += bank->regs->clr_dataout;
129 bank->context.dataout &= ~l;
132 writel_relaxed(l, reg);
135 /* set data out value using mask register */
136 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
139 bank->context.dataout = omap_gpio_rmw(bank->base + bank->regs->dataout,
140 BIT(offset), enable);
143 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
145 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
146 clk_enable(bank->dbck);
147 bank->dbck_enabled = true;
149 writel_relaxed(bank->dbck_enable_mask,
150 bank->base + bank->regs->debounce_en);
154 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
156 if (bank->dbck_enable_mask && bank->dbck_enabled) {
158 * Disable debounce before cutting it's clock. If debounce is
159 * enabled but the clock is not, GPIO module seems to be unable
160 * to detect events and generate interrupts at least on OMAP3.
162 writel_relaxed(0, bank->base + bank->regs->debounce_en);
164 clk_disable(bank->dbck);
165 bank->dbck_enabled = false;
170 * omap2_set_gpio_debounce - low level gpio debounce time
171 * @bank: the gpio bank we're acting upon
172 * @offset: the gpio number on this @bank
173 * @debounce: debounce time to use
175 * OMAP's debounce time is in 31us steps
176 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
177 * so we need to convert and round up to the closest unit.
179 * Return: 0 on success, negative error otherwise.
181 static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
186 bool enable = !!debounce;
188 if (!bank->dbck_flag)
192 debounce = DIV_ROUND_UP(debounce, 31) - 1;
193 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
199 clk_enable(bank->dbck);
200 writel_relaxed(debounce, bank->base + bank->regs->debounce);
202 val = omap_gpio_rmw(bank->base + bank->regs->debounce_en, l, enable);
203 bank->dbck_enable_mask = val;
205 clk_disable(bank->dbck);
207 * Enable debounce clock per module.
208 * This call is mandatory because in omap_gpio_request() when
209 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
210 * runtime callbck fails to turn on dbck because dbck_enable_mask
211 * used within _gpio_dbck_enable() is still not initialized at
212 * that point. Therefore we have to enable dbck here.
214 omap_gpio_dbck_enable(bank);
215 if (bank->dbck_enable_mask) {
216 bank->context.debounce = debounce;
217 bank->context.debounce_en = val;
224 * omap_clear_gpio_debounce - clear debounce settings for a gpio
225 * @bank: the gpio bank we're acting upon
226 * @offset: the gpio number on this @bank
228 * If a gpio is using debounce, then clear the debounce enable bit and if
229 * this is the only gpio in this bank using debounce, then clear the debounce
230 * time too. The debounce clock will also be disabled when calling this function
231 * if this is the only gpio in the bank using debounce.
233 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
235 u32 gpio_bit = BIT(offset);
237 if (!bank->dbck_flag)
240 if (!(bank->dbck_enable_mask & gpio_bit))
243 bank->dbck_enable_mask &= ~gpio_bit;
244 bank->context.debounce_en &= ~gpio_bit;
245 writel_relaxed(bank->context.debounce_en,
246 bank->base + bank->regs->debounce_en);
248 if (!bank->dbck_enable_mask) {
249 bank->context.debounce = 0;
250 writel_relaxed(bank->context.debounce, bank->base +
251 bank->regs->debounce);
252 clk_disable(bank->dbck);
253 bank->dbck_enabled = false;
258 * Off mode wake-up capable GPIOs in bank(s) that are in the wakeup domain.
259 * See TRM section for GPIO for "Wake-Up Generation" for the list of GPIOs
260 * in wakeup domain. If bank->non_wakeup_gpios is not configured, assume none
261 * are capable waking up the system from off mode.
263 static bool omap_gpio_is_off_wakeup_capable(struct gpio_bank *bank, u32 gpio_mask)
265 u32 no_wake = bank->non_wakeup_gpios;
268 return !!(~no_wake & gpio_mask);
273 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
276 void __iomem *base = bank->base;
277 u32 gpio_bit = BIT(gpio);
279 omap_gpio_rmw(base + bank->regs->leveldetect0, gpio_bit,
280 trigger & IRQ_TYPE_LEVEL_LOW);
281 omap_gpio_rmw(base + bank->regs->leveldetect1, gpio_bit,
282 trigger & IRQ_TYPE_LEVEL_HIGH);
285 * We need the edge detection enabled for to allow the GPIO block
286 * to be woken from idle state. Set the appropriate edge detection
287 * in addition to the level detection.
289 omap_gpio_rmw(base + bank->regs->risingdetect, gpio_bit,
290 trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH));
291 omap_gpio_rmw(base + bank->regs->fallingdetect, gpio_bit,
292 trigger & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW));
294 bank->context.leveldetect0 =
295 readl_relaxed(bank->base + bank->regs->leveldetect0);
296 bank->context.leveldetect1 =
297 readl_relaxed(bank->base + bank->regs->leveldetect1);
298 bank->context.risingdetect =
299 readl_relaxed(bank->base + bank->regs->risingdetect);
300 bank->context.fallingdetect =
301 readl_relaxed(bank->base + bank->regs->fallingdetect);
303 bank->level_mask = bank->context.leveldetect0 |
304 bank->context.leveldetect1;
306 /* This part needs to be executed always for OMAP{34xx, 44xx} */
307 if (!bank->regs->irqctrl && !omap_gpio_is_off_wakeup_capable(bank, gpio)) {
309 * Log the edge gpio and manually trigger the IRQ
310 * after resume if the input level changes
311 * to avoid irq lost during PER RET/OFF mode
312 * Applies for omap2 non-wakeup gpio and all omap3 gpios
314 if (trigger & IRQ_TYPE_EDGE_BOTH)
315 bank->enabled_non_wakeup_gpios |= gpio_bit;
317 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
322 * This only applies to chips that can't do both rising and falling edge
323 * detection at once. For all other chips, this function is a noop.
325 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
327 if (IS_ENABLED(CONFIG_ARCH_OMAP1) && bank->regs->irqctrl) {
328 void __iomem *reg = bank->base + bank->regs->irqctrl;
330 writel_relaxed(readl_relaxed(reg) ^ BIT(gpio), reg);
334 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
337 void __iomem *reg = bank->base;
340 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
341 omap_set_gpio_trigger(bank, gpio, trigger);
342 } else if (bank->regs->irqctrl) {
343 reg += bank->regs->irqctrl;
345 l = readl_relaxed(reg);
346 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
347 bank->toggle_mask |= BIT(gpio);
348 if (trigger & IRQ_TYPE_EDGE_RISING)
350 else if (trigger & IRQ_TYPE_EDGE_FALLING)
355 writel_relaxed(l, reg);
356 } else if (bank->regs->edgectrl1) {
358 reg += bank->regs->edgectrl2;
360 reg += bank->regs->edgectrl1;
363 l = readl_relaxed(reg);
364 l &= ~(3 << (gpio << 1));
365 if (trigger & IRQ_TYPE_EDGE_RISING)
366 l |= 2 << (gpio << 1);
367 if (trigger & IRQ_TYPE_EDGE_FALLING)
369 writel_relaxed(l, reg);
374 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
376 if (bank->regs->pinctrl) {
377 void __iomem *reg = bank->base + bank->regs->pinctrl;
379 /* Claim the pin for MPU */
380 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
383 if (bank->regs->ctrl && !BANK_USED(bank)) {
384 void __iomem *reg = bank->base + bank->regs->ctrl;
387 ctrl = readl_relaxed(reg);
388 /* Module is enabled, clocks are not gated */
389 ctrl &= ~GPIO_MOD_CTRL_BIT;
390 writel_relaxed(ctrl, reg);
391 bank->context.ctrl = ctrl;
395 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
397 if (bank->regs->ctrl && !BANK_USED(bank)) {
398 void __iomem *reg = bank->base + bank->regs->ctrl;
401 ctrl = readl_relaxed(reg);
402 /* Module is disabled, clocks are gated */
403 ctrl |= GPIO_MOD_CTRL_BIT;
404 writel_relaxed(ctrl, reg);
405 bank->context.ctrl = ctrl;
409 static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
411 void __iomem *reg = bank->base + bank->regs->direction;
413 return readl_relaxed(reg) & BIT(offset);
416 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
418 if (!LINE_USED(bank->mod_usage, offset)) {
419 omap_enable_gpio_module(bank, offset);
420 omap_set_gpio_direction(bank, offset, 1);
422 bank->irq_usage |= BIT(offset);
425 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
427 struct gpio_bank *bank = omap_irq_data_get_bank(d);
430 unsigned offset = d->hwirq;
432 if (type & ~IRQ_TYPE_SENSE_MASK)
435 if (!bank->regs->leveldetect0 &&
436 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
439 raw_spin_lock_irqsave(&bank->lock, flags);
440 retval = omap_set_gpio_triggering(bank, offset, type);
442 raw_spin_unlock_irqrestore(&bank->lock, flags);
445 omap_gpio_init_irq(bank, offset);
446 if (!omap_gpio_is_input(bank, offset)) {
447 raw_spin_unlock_irqrestore(&bank->lock, flags);
451 raw_spin_unlock_irqrestore(&bank->lock, flags);
453 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
454 irq_set_handler_locked(d, handle_level_irq);
455 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
457 * Edge IRQs are already cleared/acked in irq_handler and
458 * not need to be masked, as result handle_edge_irq()
459 * logic is excessed here and may cause lose of interrupts.
460 * So just use handle_simple_irq.
462 irq_set_handler_locked(d, handle_simple_irq);
470 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
472 void __iomem *reg = bank->base;
474 reg += bank->regs->irqstatus;
475 writel_relaxed(gpio_mask, reg);
477 /* Workaround for clearing DSP GPIO interrupts to allow retention */
478 if (bank->regs->irqstatus2) {
479 reg = bank->base + bank->regs->irqstatus2;
480 writel_relaxed(gpio_mask, reg);
483 /* Flush posted write for the irq status to avoid spurious interrupts */
487 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
490 omap_clear_gpio_irqbank(bank, BIT(offset));
493 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
495 void __iomem *reg = bank->base;
497 u32 mask = (BIT(bank->width)) - 1;
499 reg += bank->regs->irqenable;
500 l = readl_relaxed(reg);
501 if (bank->regs->irqenable_inv)
507 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
508 unsigned offset, int enable)
510 void __iomem *reg = bank->base;
511 u32 gpio_mask = BIT(offset);
513 if (bank->regs->set_irqenable && bank->regs->clr_irqenable) {
515 reg += bank->regs->set_irqenable;
516 bank->context.irqenable1 |= gpio_mask;
518 reg += bank->regs->clr_irqenable;
519 bank->context.irqenable1 &= ~gpio_mask;
521 writel_relaxed(gpio_mask, reg);
523 bank->context.irqenable1 =
524 omap_gpio_rmw(reg + bank->regs->irqenable, gpio_mask,
525 enable ^ bank->regs->irqenable_inv);
529 * Program GPIO wakeup along with IRQ enable to satisfy OMAP4430 TRM
530 * note requiring correlation between the IRQ enable registers and
531 * the wakeup registers. In any case, we want wakeup from idle
532 * enabled for the GPIOs which support this feature.
534 if (bank->regs->wkup_en &&
535 (bank->regs->edgectrl1 || !(bank->non_wakeup_gpios & gpio_mask))) {
536 bank->context.wake_en =
537 omap_gpio_rmw(bank->base + bank->regs->wkup_en,
542 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
543 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
545 struct gpio_bank *bank = omap_irq_data_get_bank(d);
547 return irq_set_irq_wake(bank->irq, enable);
551 * We need to unmask the GPIO bank interrupt as soon as possible to
552 * avoid missing GPIO interrupts for other lines in the bank.
553 * Then we need to mask-read-clear-unmask the triggered GPIO lines
554 * in the bank to avoid missing nested interrupts for a GPIO line.
555 * If we wait to unmask individual GPIO lines in the bank after the
556 * line's interrupt handler has been run, we may miss some nested
559 static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
561 void __iomem *isr_reg = NULL;
562 u32 enabled, isr, edge;
564 struct gpio_bank *bank = gpiobank;
565 unsigned long wa_lock_flags;
566 unsigned long lock_flags;
568 isr_reg = bank->base + bank->regs->irqstatus;
569 if (WARN_ON(!isr_reg))
572 if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
573 "gpio irq%i while runtime suspended?\n", irq))
577 raw_spin_lock_irqsave(&bank->lock, lock_flags);
579 enabled = omap_get_gpio_irqbank_mask(bank);
580 isr = readl_relaxed(isr_reg) & enabled;
583 * Clear edge sensitive interrupts before calling handler(s)
584 * so subsequent edge transitions are not missed while the
585 * handlers are running.
587 edge = isr & ~bank->level_mask;
589 omap_clear_gpio_irqbank(bank, edge);
591 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
600 raw_spin_lock_irqsave(&bank->lock, lock_flags);
602 * Some chips can't respond to both rising and falling
603 * at the same time. If this irq was requested with
604 * both flags, we need to flip the ICR data for the IRQ
605 * to respond to the IRQ for the opposite direction.
606 * This will be indicated in the bank toggle_mask.
608 if (bank->toggle_mask & (BIT(bit)))
609 omap_toggle_gpio_edge_triggering(bank, bit);
611 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
613 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
615 generic_handle_domain_irq(bank->chip.irq.domain, bit);
617 raw_spin_unlock_irqrestore(&bank->wa_lock,
625 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
627 struct gpio_bank *bank = omap_irq_data_get_bank(d);
629 unsigned offset = d->hwirq;
631 raw_spin_lock_irqsave(&bank->lock, flags);
633 if (!LINE_USED(bank->mod_usage, offset))
634 omap_set_gpio_direction(bank, offset, 1);
635 omap_enable_gpio_module(bank, offset);
636 bank->irq_usage |= BIT(offset);
638 raw_spin_unlock_irqrestore(&bank->lock, flags);
639 omap_gpio_unmask_irq(d);
644 static void omap_gpio_irq_shutdown(struct irq_data *d)
646 struct gpio_bank *bank = omap_irq_data_get_bank(d);
648 unsigned offset = d->hwirq;
650 raw_spin_lock_irqsave(&bank->lock, flags);
651 bank->irq_usage &= ~(BIT(offset));
652 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
653 omap_clear_gpio_irqstatus(bank, offset);
654 omap_set_gpio_irqenable(bank, offset, 0);
655 if (!LINE_USED(bank->mod_usage, offset))
656 omap_clear_gpio_debounce(bank, offset);
657 omap_disable_gpio_module(bank, offset);
658 raw_spin_unlock_irqrestore(&bank->lock, flags);
661 static void omap_gpio_irq_bus_lock(struct irq_data *data)
663 struct gpio_bank *bank = omap_irq_data_get_bank(data);
665 pm_runtime_get_sync(bank->chip.parent);
668 static void gpio_irq_bus_sync_unlock(struct irq_data *data)
670 struct gpio_bank *bank = omap_irq_data_get_bank(data);
672 pm_runtime_put(bank->chip.parent);
675 static void omap_gpio_mask_irq(struct irq_data *d)
677 struct gpio_bank *bank = omap_irq_data_get_bank(d);
678 unsigned offset = d->hwirq;
681 raw_spin_lock_irqsave(&bank->lock, flags);
682 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
683 omap_set_gpio_irqenable(bank, offset, 0);
684 raw_spin_unlock_irqrestore(&bank->lock, flags);
685 gpiochip_disable_irq(&bank->chip, offset);
688 static void omap_gpio_unmask_irq(struct irq_data *d)
690 struct gpio_bank *bank = omap_irq_data_get_bank(d);
691 unsigned offset = d->hwirq;
692 u32 trigger = irqd_get_trigger_type(d);
695 gpiochip_enable_irq(&bank->chip, offset);
696 raw_spin_lock_irqsave(&bank->lock, flags);
697 omap_set_gpio_irqenable(bank, offset, 1);
700 * For level-triggered GPIOs, clearing must be done after the source
701 * is cleared, thus after the handler has run. OMAP4 needs this done
702 * after enabing the interrupt to clear the wakeup status.
704 if (bank->regs->leveldetect0 && bank->regs->wkup_en &&
705 trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
706 omap_clear_gpio_irqstatus(bank, offset);
709 omap_set_gpio_triggering(bank, offset, trigger);
711 raw_spin_unlock_irqrestore(&bank->lock, flags);
714 static void omap_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p)
716 struct gpio_bank *bank = omap_irq_data_get_bank(d);
718 seq_printf(p, dev_name(bank->dev));
721 static const struct irq_chip omap_gpio_irq_chip = {
722 .irq_startup = omap_gpio_irq_startup,
723 .irq_shutdown = omap_gpio_irq_shutdown,
724 .irq_mask = omap_gpio_mask_irq,
725 .irq_unmask = omap_gpio_unmask_irq,
726 .irq_set_type = omap_gpio_irq_type,
727 .irq_set_wake = omap_gpio_wake_enable,
728 .irq_bus_lock = omap_gpio_irq_bus_lock,
729 .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
730 .irq_print_chip = omap_gpio_irq_print_chip,
731 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
732 GPIOCHIP_IRQ_RESOURCE_HELPERS,
735 static const struct irq_chip omap_gpio_irq_chip_nowake = {
736 .irq_startup = omap_gpio_irq_startup,
737 .irq_shutdown = omap_gpio_irq_shutdown,
738 .irq_mask = omap_gpio_mask_irq,
739 .irq_unmask = omap_gpio_unmask_irq,
740 .irq_set_type = omap_gpio_irq_type,
741 .irq_bus_lock = omap_gpio_irq_bus_lock,
742 .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
743 .irq_print_chip = omap_gpio_irq_print_chip,
744 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
745 GPIOCHIP_IRQ_RESOURCE_HELPERS,
748 /*---------------------------------------------------------------------*/
750 static int omap_mpuio_suspend_noirq(struct device *dev)
752 struct gpio_bank *bank = dev_get_drvdata(dev);
753 void __iomem *mask_reg = bank->base +
754 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
757 raw_spin_lock_irqsave(&bank->lock, flags);
758 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
759 raw_spin_unlock_irqrestore(&bank->lock, flags);
764 static int omap_mpuio_resume_noirq(struct device *dev)
766 struct gpio_bank *bank = dev_get_drvdata(dev);
767 void __iomem *mask_reg = bank->base +
768 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
771 raw_spin_lock_irqsave(&bank->lock, flags);
772 writel_relaxed(bank->context.wake_en, mask_reg);
773 raw_spin_unlock_irqrestore(&bank->lock, flags);
778 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
779 .suspend_noirq = omap_mpuio_suspend_noirq,
780 .resume_noirq = omap_mpuio_resume_noirq,
783 /* use platform_driver for this. */
784 static struct platform_driver omap_mpuio_driver = {
787 .pm = &omap_mpuio_dev_pm_ops,
791 static struct platform_device omap_mpuio_device = {
795 .driver = &omap_mpuio_driver.driver,
797 /* could list the /proc/iomem resources */
800 static inline void omap_mpuio_init(struct gpio_bank *bank)
802 platform_set_drvdata(&omap_mpuio_device, bank);
804 if (platform_driver_register(&omap_mpuio_driver) == 0)
805 (void) platform_device_register(&omap_mpuio_device);
808 /*---------------------------------------------------------------------*/
810 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
812 struct gpio_bank *bank = gpiochip_get_data(chip);
815 pm_runtime_get_sync(chip->parent);
817 raw_spin_lock_irqsave(&bank->lock, flags);
818 omap_enable_gpio_module(bank, offset);
819 bank->mod_usage |= BIT(offset);
820 raw_spin_unlock_irqrestore(&bank->lock, flags);
825 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
827 struct gpio_bank *bank = gpiochip_get_data(chip);
830 raw_spin_lock_irqsave(&bank->lock, flags);
831 bank->mod_usage &= ~(BIT(offset));
832 if (!LINE_USED(bank->irq_usage, offset)) {
833 omap_set_gpio_direction(bank, offset, 1);
834 omap_clear_gpio_debounce(bank, offset);
836 omap_disable_gpio_module(bank, offset);
837 raw_spin_unlock_irqrestore(&bank->lock, flags);
839 pm_runtime_put(chip->parent);
842 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
844 struct gpio_bank *bank = gpiochip_get_data(chip);
846 if (readl_relaxed(bank->base + bank->regs->direction) & BIT(offset))
847 return GPIO_LINE_DIRECTION_IN;
849 return GPIO_LINE_DIRECTION_OUT;
852 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
854 struct gpio_bank *bank;
857 bank = gpiochip_get_data(chip);
858 raw_spin_lock_irqsave(&bank->lock, flags);
859 omap_set_gpio_direction(bank, offset, 1);
860 raw_spin_unlock_irqrestore(&bank->lock, flags);
864 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
866 struct gpio_bank *bank = gpiochip_get_data(chip);
869 if (omap_gpio_is_input(bank, offset))
870 reg = bank->base + bank->regs->datain;
872 reg = bank->base + bank->regs->dataout;
874 return (readl_relaxed(reg) & BIT(offset)) != 0;
877 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
879 struct gpio_bank *bank;
882 bank = gpiochip_get_data(chip);
883 raw_spin_lock_irqsave(&bank->lock, flags);
884 bank->set_dataout(bank, offset, value);
885 omap_set_gpio_direction(bank, offset, 0);
886 raw_spin_unlock_irqrestore(&bank->lock, flags);
890 static int omap_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
893 struct gpio_bank *bank = gpiochip_get_data(chip);
894 void __iomem *base = bank->base;
895 u32 direction, m, val = 0;
897 direction = readl_relaxed(base + bank->regs->direction);
899 m = direction & *mask;
901 val |= readl_relaxed(base + bank->regs->datain) & m;
903 m = ~direction & *mask;
905 val |= readl_relaxed(base + bank->regs->dataout) & m;
912 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
915 struct gpio_bank *bank;
919 bank = gpiochip_get_data(chip);
921 raw_spin_lock_irqsave(&bank->lock, flags);
922 ret = omap2_set_gpio_debounce(bank, offset, debounce);
923 raw_spin_unlock_irqrestore(&bank->lock, flags);
926 dev_info(chip->parent,
927 "Could not set line %u debounce to %u microseconds (%d)",
928 offset, debounce, ret);
933 static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
934 unsigned long config)
939 switch (pinconf_to_config_param(config)) {
940 case PIN_CONFIG_BIAS_DISABLE:
941 case PIN_CONFIG_BIAS_PULL_UP:
942 case PIN_CONFIG_BIAS_PULL_DOWN:
943 ret = gpiochip_generic_config(chip, offset, config);
945 case PIN_CONFIG_INPUT_DEBOUNCE:
946 debounce = pinconf_to_config_argument(config);
947 ret = omap_gpio_debounce(chip, offset, debounce);
956 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
958 struct gpio_bank *bank;
961 bank = gpiochip_get_data(chip);
962 raw_spin_lock_irqsave(&bank->lock, flags);
963 bank->set_dataout(bank, offset, value);
964 raw_spin_unlock_irqrestore(&bank->lock, flags);
967 static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
970 struct gpio_bank *bank = gpiochip_get_data(chip);
971 void __iomem *reg = bank->base + bank->regs->dataout;
975 raw_spin_lock_irqsave(&bank->lock, flags);
976 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask);
977 writel_relaxed(l, reg);
978 bank->context.dataout = l;
979 raw_spin_unlock_irqrestore(&bank->lock, flags);
982 /*---------------------------------------------------------------------*/
984 static void omap_gpio_show_rev(struct gpio_bank *bank)
989 if (called || bank->regs->revision == USHRT_MAX)
992 rev = readw_relaxed(bank->base + bank->regs->revision);
993 pr_info("OMAP GPIO hardware version %d.%d\n",
994 (rev >> 4) & 0x0f, rev & 0x0f);
999 static void omap_gpio_mod_init(struct gpio_bank *bank)
1001 void __iomem *base = bank->base;
1004 if (bank->width == 16)
1007 if (bank->is_mpuio) {
1008 writel_relaxed(l, bank->base + bank->regs->irqenable);
1012 omap_gpio_rmw(base + bank->regs->irqenable, l,
1013 bank->regs->irqenable_inv);
1014 omap_gpio_rmw(base + bank->regs->irqstatus, l,
1015 !bank->regs->irqenable_inv);
1016 if (bank->regs->debounce_en)
1017 writel_relaxed(0, base + bank->regs->debounce_en);
1019 /* Save OE default value (0xffffffff) in the context */
1020 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1021 /* Initialize interface clk ungated, module enabled */
1022 if (bank->regs->ctrl)
1023 writel_relaxed(0, base + bank->regs->ctrl);
1026 static int omap_gpio_chip_init(struct gpio_bank *bank, struct device *pm_dev)
1028 struct gpio_irq_chip *irq;
1034 * REVISIT eventually switch from OMAP-specific gpio structs
1035 * over to the generic ones
1037 bank->chip.request = omap_gpio_request;
1038 bank->chip.free = omap_gpio_free;
1039 bank->chip.get_direction = omap_gpio_get_direction;
1040 bank->chip.direction_input = omap_gpio_input;
1041 bank->chip.get = omap_gpio_get;
1042 bank->chip.get_multiple = omap_gpio_get_multiple;
1043 bank->chip.direction_output = omap_gpio_output;
1044 bank->chip.set_config = omap_gpio_set_config;
1045 bank->chip.set = omap_gpio_set;
1046 bank->chip.set_multiple = omap_gpio_set_multiple;
1047 if (bank->is_mpuio) {
1048 bank->chip.label = "mpuio";
1049 if (bank->regs->wkup_en)
1050 bank->chip.parent = &omap_mpuio_device.dev;
1051 bank->chip.base = OMAP_MPUIO(0);
1053 label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
1054 gpio, gpio + bank->width - 1);
1057 bank->chip.label = label;
1058 bank->chip.base = -1;
1060 bank->chip.ngpio = bank->width;
1062 irq = &bank->chip.irq;
1063 /* MPUIO is a bit different, reading IRQ status clears it */
1064 if (bank->is_mpuio && !bank->regs->wkup_en)
1065 gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip_nowake);
1067 gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip);
1068 irq->handler = handle_bad_irq;
1069 irq->default_type = IRQ_TYPE_NONE;
1070 irq->num_parents = 1;
1071 irq->parents = &bank->irq;
1073 ret = gpiochip_add_data(&bank->chip, bank);
1075 return dev_err_probe(bank->chip.parent, ret, "Could not register gpio chip\n");
1077 irq_domain_set_pm_device(bank->chip.irq.domain, pm_dev);
1078 ret = devm_request_irq(bank->chip.parent, bank->irq,
1079 omap_gpio_irq_handler,
1080 0, dev_name(bank->chip.parent), bank);
1082 gpiochip_remove(&bank->chip);
1084 if (!bank->is_mpuio)
1085 gpio += bank->width;
1090 static void omap_gpio_init_context(struct gpio_bank *p)
1092 const struct omap_gpio_reg_offs *regs = p->regs;
1093 void __iomem *base = p->base;
1095 p->context.sysconfig = readl_relaxed(base + regs->sysconfig);
1096 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1097 p->context.oe = readl_relaxed(base + regs->direction);
1098 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1099 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1100 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1101 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1102 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1103 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1104 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1105 p->context.dataout = readl_relaxed(base + regs->dataout);
1107 p->context_valid = true;
1110 static void omap_gpio_restore_context(struct gpio_bank *bank)
1112 const struct omap_gpio_reg_offs *regs = bank->regs;
1113 void __iomem *base = bank->base;
1115 writel_relaxed(bank->context.sysconfig, base + regs->sysconfig);
1116 writel_relaxed(bank->context.wake_en, base + regs->wkup_en);
1117 writel_relaxed(bank->context.ctrl, base + regs->ctrl);
1118 writel_relaxed(bank->context.leveldetect0, base + regs->leveldetect0);
1119 writel_relaxed(bank->context.leveldetect1, base + regs->leveldetect1);
1120 writel_relaxed(bank->context.risingdetect, base + regs->risingdetect);
1121 writel_relaxed(bank->context.fallingdetect, base + regs->fallingdetect);
1122 writel_relaxed(bank->context.dataout, base + regs->dataout);
1123 writel_relaxed(bank->context.oe, base + regs->direction);
1125 if (bank->dbck_enable_mask) {
1126 writel_relaxed(bank->context.debounce, base + regs->debounce);
1127 writel_relaxed(bank->context.debounce_en,
1128 base + regs->debounce_en);
1131 writel_relaxed(bank->context.irqenable1, base + regs->irqenable);
1132 writel_relaxed(bank->context.irqenable2, base + regs->irqenable2);
1135 static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
1137 struct device *dev = bank->chip.parent;
1138 void __iomem *base = bank->base;
1141 bank->saved_datain = readl_relaxed(base + bank->regs->datain);
1143 /* Save syconfig, it's runtime value can be different from init value */
1144 if (bank->loses_context)
1145 bank->context.sysconfig = readl_relaxed(base + bank->regs->sysconfig);
1147 if (!bank->enabled_non_wakeup_gpios)
1148 goto update_gpio_context_count;
1150 /* Check for pending EDGE_FALLING, ignore EDGE_BOTH */
1151 mask = bank->enabled_non_wakeup_gpios & bank->context.fallingdetect;
1152 mask &= ~bank->context.risingdetect;
1153 bank->saved_datain |= mask;
1155 /* Check for pending EDGE_RISING, ignore EDGE_BOTH */
1156 mask = bank->enabled_non_wakeup_gpios & bank->context.risingdetect;
1157 mask &= ~bank->context.fallingdetect;
1158 bank->saved_datain &= ~mask;
1160 if (!may_lose_context)
1161 goto update_gpio_context_count;
1164 * If going to OFF, remove triggering for all wkup domain
1165 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1166 * generated. See OMAP2420 Errata item 1.101.
1168 if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
1169 nowake = bank->enabled_non_wakeup_gpios;
1170 omap_gpio_rmw(base + bank->regs->fallingdetect, nowake, ~nowake);
1171 omap_gpio_rmw(base + bank->regs->risingdetect, nowake, ~nowake);
1174 update_gpio_context_count:
1175 if (bank->get_context_loss_count)
1176 bank->context_loss_count =
1177 bank->get_context_loss_count(dev);
1179 omap_gpio_dbck_disable(bank);
1182 static void omap_gpio_unidle(struct gpio_bank *bank)
1184 struct device *dev = bank->chip.parent;
1185 u32 l = 0, gen, gen0, gen1;
1189 * On the first resume during the probe, the context has not
1190 * been initialised and so initialise it now. Also initialise
1191 * the context loss count.
1193 if (bank->loses_context && !bank->context_valid) {
1194 omap_gpio_init_context(bank);
1196 if (bank->get_context_loss_count)
1197 bank->context_loss_count =
1198 bank->get_context_loss_count(dev);
1201 omap_gpio_dbck_enable(bank);
1203 if (bank->loses_context) {
1204 if (!bank->get_context_loss_count) {
1205 omap_gpio_restore_context(bank);
1207 c = bank->get_context_loss_count(dev);
1208 if (c != bank->context_loss_count) {
1209 omap_gpio_restore_context(bank);
1215 /* Restore changes done for OMAP2420 errata 1.101 */
1216 writel_relaxed(bank->context.fallingdetect,
1217 bank->base + bank->regs->fallingdetect);
1218 writel_relaxed(bank->context.risingdetect,
1219 bank->base + bank->regs->risingdetect);
1222 l = readl_relaxed(bank->base + bank->regs->datain);
1225 * Check if any of the non-wakeup interrupt GPIOs have changed
1226 * state. If so, generate an IRQ by software. This is
1227 * horribly racy, but it's the best we can do to work around
1230 l ^= bank->saved_datain;
1231 l &= bank->enabled_non_wakeup_gpios;
1234 * No need to generate IRQs for the rising edge for gpio IRQs
1235 * configured with falling edge only; and vice versa.
1237 gen0 = l & bank->context.fallingdetect;
1238 gen0 &= bank->saved_datain;
1240 gen1 = l & bank->context.risingdetect;
1241 gen1 &= ~(bank->saved_datain);
1243 /* FIXME: Consider GPIO IRQs with level detections properly! */
1244 gen = l & (~(bank->context.fallingdetect) &
1245 ~(bank->context.risingdetect));
1246 /* Consider all GPIO IRQs needed to be updated */
1252 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1253 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1255 if (!bank->regs->irqstatus_raw0) {
1256 writel_relaxed(old0 | gen, bank->base +
1257 bank->regs->leveldetect0);
1258 writel_relaxed(old1 | gen, bank->base +
1259 bank->regs->leveldetect1);
1262 if (bank->regs->irqstatus_raw0) {
1263 writel_relaxed(old0 | l, bank->base +
1264 bank->regs->leveldetect0);
1265 writel_relaxed(old1 | l, bank->base +
1266 bank->regs->leveldetect1);
1268 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1269 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1273 static int gpio_omap_cpu_notifier(struct notifier_block *nb,
1274 unsigned long cmd, void *v)
1276 struct gpio_bank *bank;
1277 unsigned long flags;
1278 int ret = NOTIFY_OK;
1281 bank = container_of(nb, struct gpio_bank, nb);
1283 raw_spin_lock_irqsave(&bank->lock, flags);
1284 if (bank->is_suspended)
1288 case CPU_CLUSTER_PM_ENTER:
1289 mask = omap_get_gpio_irqbank_mask(bank);
1290 isr = readl_relaxed(bank->base + bank->regs->irqstatus) & mask;
1295 omap_gpio_idle(bank, true);
1297 case CPU_CLUSTER_PM_ENTER_FAILED:
1298 case CPU_CLUSTER_PM_EXIT:
1299 omap_gpio_unidle(bank);
1304 raw_spin_unlock_irqrestore(&bank->lock, flags);
1309 static const struct omap_gpio_reg_offs omap2_gpio_regs = {
1310 .revision = OMAP24XX_GPIO_REVISION,
1311 .sysconfig = OMAP24XX_GPIO_SYSCONFIG,
1312 .direction = OMAP24XX_GPIO_OE,
1313 .datain = OMAP24XX_GPIO_DATAIN,
1314 .dataout = OMAP24XX_GPIO_DATAOUT,
1315 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1316 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1317 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1318 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1319 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1320 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1321 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1322 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1323 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1324 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1325 .ctrl = OMAP24XX_GPIO_CTRL,
1326 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1327 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1328 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1329 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1330 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1333 static const struct omap_gpio_reg_offs omap4_gpio_regs = {
1334 .revision = OMAP4_GPIO_REVISION,
1335 .sysconfig = OMAP4_GPIO_SYSCONFIG,
1336 .direction = OMAP4_GPIO_OE,
1337 .datain = OMAP4_GPIO_DATAIN,
1338 .dataout = OMAP4_GPIO_DATAOUT,
1339 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1340 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1341 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1342 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1343 .irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0,
1344 .irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1,
1345 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1346 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1347 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1348 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1349 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1350 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1351 .ctrl = OMAP4_GPIO_CTRL,
1352 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1353 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1354 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1355 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1356 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1359 static const struct omap_gpio_platform_data omap2_pdata = {
1360 .regs = &omap2_gpio_regs,
1365 static const struct omap_gpio_platform_data omap3_pdata = {
1366 .regs = &omap2_gpio_regs,
1371 static const struct omap_gpio_platform_data omap4_pdata = {
1372 .regs = &omap4_gpio_regs,
1377 static const struct of_device_id omap_gpio_match[] = {
1379 .compatible = "ti,omap4-gpio",
1380 .data = &omap4_pdata,
1383 .compatible = "ti,omap3-gpio",
1384 .data = &omap3_pdata,
1387 .compatible = "ti,omap2-gpio",
1388 .data = &omap2_pdata,
1392 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1394 static int omap_gpio_probe(struct platform_device *pdev)
1396 struct device *dev = &pdev->dev;
1397 struct device_node *node = dev->of_node;
1398 const struct omap_gpio_platform_data *pdata;
1399 struct gpio_bank *bank;
1402 pdata = device_get_match_data(dev);
1404 pdata = pdata ?: dev_get_platdata(dev);
1408 bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
1414 bank->irq = platform_get_irq(pdev, 0);
1418 bank->chip.parent = dev;
1419 bank->chip.owner = THIS_MODULE;
1420 bank->dbck_flag = pdata->dbck_flag;
1421 bank->stride = pdata->bank_stride;
1422 bank->width = pdata->bank_width;
1423 bank->is_mpuio = pdata->is_mpuio;
1424 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1425 bank->regs = pdata->regs;
1428 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1429 bank->loses_context = true;
1431 bank->loses_context = pdata->loses_context;
1433 if (bank->loses_context)
1434 bank->get_context_loss_count =
1435 pdata->get_context_loss_count;
1438 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1439 bank->set_dataout = omap_set_gpio_dataout_reg;
1441 bank->set_dataout = omap_set_gpio_dataout_mask;
1443 raw_spin_lock_init(&bank->lock);
1444 raw_spin_lock_init(&bank->wa_lock);
1446 /* Static mapping, never released */
1447 bank->base = devm_platform_ioremap_resource(pdev, 0);
1448 if (IS_ERR(bank->base)) {
1449 return PTR_ERR(bank->base);
1452 if (bank->dbck_flag) {
1453 bank->dbck = devm_clk_get(dev, "dbclk");
1454 if (IS_ERR(bank->dbck)) {
1456 "Could not get gpio dbck. Disable debounce\n");
1457 bank->dbck_flag = false;
1459 clk_prepare(bank->dbck);
1463 platform_set_drvdata(pdev, bank);
1465 pm_runtime_enable(dev);
1466 pm_runtime_get_sync(dev);
1469 omap_mpuio_init(bank);
1471 omap_gpio_mod_init(bank);
1473 ret = omap_gpio_chip_init(bank, dev);
1475 pm_runtime_put_sync(dev);
1476 pm_runtime_disable(dev);
1477 if (bank->dbck_flag)
1478 clk_unprepare(bank->dbck);
1482 omap_gpio_show_rev(bank);
1484 bank->nb.notifier_call = gpio_omap_cpu_notifier;
1485 cpu_pm_register_notifier(&bank->nb);
1487 pm_runtime_put(dev);
1492 static int omap_gpio_remove(struct platform_device *pdev)
1494 struct gpio_bank *bank = platform_get_drvdata(pdev);
1496 cpu_pm_unregister_notifier(&bank->nb);
1497 gpiochip_remove(&bank->chip);
1498 pm_runtime_disable(&pdev->dev);
1499 if (bank->dbck_flag)
1500 clk_unprepare(bank->dbck);
1505 static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
1507 struct gpio_bank *bank = dev_get_drvdata(dev);
1508 unsigned long flags;
1510 raw_spin_lock_irqsave(&bank->lock, flags);
1511 omap_gpio_idle(bank, true);
1512 bank->is_suspended = true;
1513 raw_spin_unlock_irqrestore(&bank->lock, flags);
1518 static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
1520 struct gpio_bank *bank = dev_get_drvdata(dev);
1521 unsigned long flags;
1523 raw_spin_lock_irqsave(&bank->lock, flags);
1524 omap_gpio_unidle(bank);
1525 bank->is_suspended = false;
1526 raw_spin_unlock_irqrestore(&bank->lock, flags);
1531 static int __maybe_unused omap_gpio_suspend(struct device *dev)
1533 struct gpio_bank *bank = dev_get_drvdata(dev);
1535 if (bank->is_suspended)
1538 bank->needs_resume = 1;
1540 return omap_gpio_runtime_suspend(dev);
1543 static int __maybe_unused omap_gpio_resume(struct device *dev)
1545 struct gpio_bank *bank = dev_get_drvdata(dev);
1547 if (!bank->needs_resume)
1550 bank->needs_resume = 0;
1552 return omap_gpio_runtime_resume(dev);
1555 static const struct dev_pm_ops gpio_pm_ops = {
1556 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1558 SET_LATE_SYSTEM_SLEEP_PM_OPS(omap_gpio_suspend, omap_gpio_resume)
1561 static struct platform_driver omap_gpio_driver = {
1562 .probe = omap_gpio_probe,
1563 .remove = omap_gpio_remove,
1565 .name = "omap_gpio",
1567 .of_match_table = omap_gpio_match,
1572 * gpio driver register needs to be done before
1573 * machine_init functions access gpio APIs.
1574 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1576 static int __init omap_gpio_drv_reg(void)
1578 return platform_driver_register(&omap_gpio_driver);
1580 postcore_initcall(omap_gpio_drv_reg);
1582 static void __exit omap_gpio_exit(void)
1584 platform_driver_unregister(&omap_gpio_driver);
1586 module_exit(omap_gpio_exit);
1588 MODULE_DESCRIPTION("omap gpio driver");
1589 MODULE_ALIAS("platform:gpio-omap");
1590 MODULE_LICENSE("GPL v2");