ARM: OMAP: use edge/level handlers from generic IRQ framework

Currently, the GPIO interrupt handling is duplicating some of the work
done by the generic IRQ handlers (handle_edge_irq, handle_level_irq)
such as detecting nesting, handling re-triggers etc.  Remove this
duplication and use generic hooks based on IRQ type.

Using generic IRQ handlers ensures correct behavior when using
threaded interrupts introduced by the -rt patch.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 4f104e4..1903a34 100644 (file)
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -542,10 +542,6 @@ static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
        bank->level_mask =
                __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0) |
                __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
-       /*
-        * FIXME: Possibly do 'set_irq_handler(j, handle_level_irq)' if only
-        * level triggering requested.
-        */
 }
 #endif
 
@@ -656,6 +652,12 @@ static int gpio_irq_type(unsigned irq, unsigned type)
                irq_desc[irq].status |= type;
        }
        spin_unlock_irqrestore(&bank->lock, flags);
+
+       if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+               __set_irq_handler_unlocked(irq, handle_level_irq);
+       else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
+               __set_irq_handler_unlocked(irq, handle_edge_irq);
+
        return retval;
 }
 
@@ -1050,42 +1052,12 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
                gpio_irq = bank->virtual_irq_start;
                for (; isr != 0; isr >>= 1, gpio_irq++) {
                        struct irq_desc *d;
-                       int irq_mask;
+
                        if (!(isr & 1))
                                continue;
                        d = irq_desc + gpio_irq;
-                       /* Don't run the handler if it's already running
-                        * or was disabled lazely.
-                        */
-                       if (unlikely((d->depth ||
-                                     (d->status & IRQ_INPROGRESS)))) {
-                               irq_mask = 1 <<
-                                       (gpio_irq - bank->virtual_irq_start);
-                               /* The unmasking will be done by
-                                * enable_irq in case it is disabled or
-                                * after returning from the handler if
-                                * it's already running.
-                                */
-                               _enable_gpio_irqbank(bank, irq_mask, 0);
-                               if (!d->depth) {
-                                       /* Level triggered interrupts
-                                        * won't ever be reentered
-                                        */
-                                       BUG_ON(level_mask & irq_mask);
-                                       d->status |= IRQ_PENDING;
-                               }
-                               continue;
-                       }
 
                        desc_handle_irq(gpio_irq, d);
-
-                       if (unlikely((d->status & IRQ_PENDING) && !d->depth)) {
-                               irq_mask = 1 <<
-                                       (gpio_irq - bank->virtual_irq_start);
-                               d->status &= ~IRQ_PENDING;
-                               _enable_gpio_irqbank(bank, irq_mask, 1);
-                               retrigger |= irq_mask;
-                       }
                }
        }
        /* if bank has any level sensitive GPIO pin interrupt