arm: at91: Cleanup irq chip

Avoid the whole lazy disable dance in the demux handler by providing a
irq_disable() callback.

Use the proper accessor functions and tidy up gpio_irq_handler()

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index 5abcfc0..6fd8248 100644 (file)
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c
@@ -375,6 +375,7 @@ static int gpio_irq_type(struct irq_data *d, unsigned type)
 
 static struct irq_chip gpio_irqchip = {
        .name           = "GPIO",
+       .irq_disable    = gpio_irq_mask,
        .irq_mask       = gpio_irq_mask,
        .irq_unmask     = gpio_irq_unmask,
        .irq_set_type   = gpio_irq_type,
@@ -384,16 +385,14 @@ static struct irq_chip gpio_irqchip = {
 static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
 {
        unsigned        pin;
-       struct irq_desc *gpio;
-       struct at91_gpio_chip *at91_gpio;
-       void __iomem    *pio;
+       struct irq_data *idata = irq_desc_get_irq_data(desc);
+       struct irq_chip *chip = irq_data_get_irq_chip(idata);
+       struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(idata);
+       void __iomem    *pio = at91_gpio->regbase;
        u32             isr;
 
-       at91_gpio = get_irq_chip_data(irq);
-       pio = at91_gpio->regbase;
-
        /* temporarily mask (level sensitive) parent IRQ */
-       desc->irq_data.chip->irq_ack(&desc->irq_data);
+       chip->irq_ack(idata);
        for (;;) {
                /* Reading ISR acks pending (edge triggered) GPIO interrupts.
                 * When there none are pending, we're finished unless we need
@@ -409,27 +408,15 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
                }
 
                pin = at91_gpio->chip.base;
-               gpio = &irq_desc[pin];
 
                while (isr) {
-                       if (isr & 1) {
-                               if (unlikely(gpio->depth)) {
-                                       /*
-                                        * The core ARM interrupt handler lazily disables IRQs so
-                                        * another IRQ must be generated before it actually gets
-                                        * here to be disabled on the GPIO controller.
-                                        */
-                                       gpio_irq_mask(irq_get_irq_data(pin));
-                               }
-                               else
-                                       generic_handle_irq(pin);
-                       }
+                       if (isr & 1)
+                               generic_handle_irq(pin);
                        pin++;
-                       gpio++;
                        isr >>= 1;
                }
        }
-       desc->irq_data.chip->irq_unmask(&desc->irq_data);
+       chip->irq_unmask(idata);
        /* now it may re-trigger */
 }