From 6437c7ba69c30a2d3dfd6aa9e8b464c3c4a8cd43 Mon Sep 17 00:00:00 2001 From: Hoan Tran Date: Fri, 8 Sep 2017 15:41:15 -0700 Subject: gpio: dwapb: Add wakeup source support This patch supports irq_set_wake for dwapb gpio. It allows GPIOs to be configured as wakeup sources and wake the system from suspend. Signed-off-by: Hoan Tran Signed-off-by: Linus Walleij --- drivers/gpio/gpio-dwapb.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'drivers/gpio/gpio-dwapb.c') diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index c07ada9c7af6..5cdb7bc3ad99 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -77,6 +77,7 @@ struct dwapb_context { u32 int_type; u32 int_pol; u32 int_deb; + u32 wake_en; }; #endif @@ -295,6 +296,22 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type) return 0; } +#ifdef CONFIG_PM_SLEEP +static int dwapb_irq_set_wake(struct irq_data *d, unsigned int enable) +{ + struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); + struct dwapb_gpio *gpio = igc->private; + struct dwapb_context *ctx = gpio->ports[0].ctx; + + if (enable) + ctx->wake_en |= BIT(d->hwirq); + else + ctx->wake_en &= ~BIT(d->hwirq); + + return 0; +} +#endif + static int dwapb_gpio_set_debounce(struct gpio_chip *gc, unsigned offset, unsigned debounce) { @@ -385,6 +402,9 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio, ct->chip.irq_disable = dwapb_irq_disable; ct->chip.irq_request_resources = dwapb_irq_reqres; ct->chip.irq_release_resources = dwapb_irq_relres; +#ifdef CONFIG_PM_SLEEP + ct->chip.irq_set_wake = dwapb_irq_set_wake; +#endif ct->regs.ack = gpio_reg_convert(gpio, GPIO_PORTA_EOI); ct->regs.mask = gpio_reg_convert(gpio, GPIO_INTMASK); ct->type = IRQ_TYPE_LEVEL_MASK; @@ -699,7 +719,8 @@ static int dwapb_gpio_suspend(struct device *dev) ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); /* Mask out interrupts */ - dwapb_write(gpio, GPIO_INTMASK, 0xffffffff); + dwapb_write(gpio, GPIO_INTMASK, + 0xffffffff & ~ctx->wake_en); } } spin_unlock_irqrestore(&gc->bgpio_lock, flags); -- cgit v1.2.3