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pinctrl: amd: Implement irq_set_wake 

This allows the OS to control which devices produce wake events.

$ grep enabled /sys/kernel/irq/*/wakeup
/sys/kernel/irq/24/wakeup:enabled

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Link: https://lore.kernel.org/r/20210429163341.1.I7631534622233689dd81410525e0dd617b9b2012@changeid
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Raul E Rangel 2021-04-29 16:34:24 -06:00 committed by Linus Walleij
parent ac5f8197d1
commit d62bd5ce12
1 changed files with 31 additions and 1 deletions
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32
drivers/pinctrl/pinctrl-amd.c
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@ -438,6 +438,29 @@ static void amd_gpio_irq_unmask(struct irq_data *d)
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
{
u32 pin_reg;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) |
BIT(WAKE_CNTRL_OFF_S4);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
if (on)
pin_reg |= wake_mask;
else
pin_reg &= ~wake_mask;
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return 0;
}
static void amd_gpio_irq_eoi(struct irq_data *d)
{
u32 reg;
@ -552,9 +575,16 @@ static struct irq_chip amd_gpio_irqchip = {
.irq_disable = amd_gpio_irq_disable,
.irq_mask = amd_gpio_irq_mask,
.irq_unmask = amd_gpio_irq_unmask,
.irq_set_wake = amd_gpio_irq_set_wake,
.irq_eoi = amd_gpio_irq_eoi,
.irq_set_type = amd_gpio_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
/*
* We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event
* also generates an IRQ. We need the IRQ so the irq_handler can clear
* the wake event. Otherwise the wake event will never clear and
* prevent the system from suspending.
*/
.flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND,
};
#define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))