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 <hotran@apm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index c07ada9..5cdb7bc 100644 (file)
--- 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);