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Diffstat (limited to 'arch/arm/plat-omap/gpio.c')
-rw-r--r--arch/arm/plat-omap/gpio.c103
1 files changed, 94 insertions, 9 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 418b88fbea8..ae08eeec7aa 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -536,6 +536,49 @@ static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
_clear_gpio_irqbank(bank, 1 << get_gpio_index(gpio));
}
+static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
+{
+ void __iomem *reg = bank->base;
+ int inv = 0;
+ u32 l;
+ u32 mask;
+
+ switch (bank->method) {
+ case METHOD_MPUIO:
+ reg += OMAP_MPUIO_GPIO_MASKIT;
+ mask = 0xffff;
+ inv = 1;
+ break;
+ case METHOD_GPIO_1510:
+ reg += OMAP1510_GPIO_INT_MASK;
+ mask = 0xffff;
+ inv = 1;
+ break;
+ case METHOD_GPIO_1610:
+ reg += OMAP1610_GPIO_IRQENABLE1;
+ mask = 0xffff;
+ break;
+ case METHOD_GPIO_730:
+ reg += OMAP730_GPIO_INT_MASK;
+ mask = 0xffffffff;
+ inv = 1;
+ break;
+ case METHOD_GPIO_24XX:
+ reg += OMAP24XX_GPIO_IRQENABLE1;
+ mask = 0xffffffff;
+ break;
+ default:
+ BUG();
+ return 0;
+ }
+
+ l = __raw_readl(reg);
+ if (inv)
+ l = ~l;
+ l &= mask;
+ return l;
+}
+
static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask, int enable)
{
void __iomem *reg = bank->base;
@@ -735,6 +778,8 @@ static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
u32 isr;
unsigned int gpio_irq;
struct gpio_bank *bank;
+ u32 retrigger = 0;
+ int unmasked = 0;
desc->chip->ack(irq);
@@ -759,18 +804,22 @@ static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
#endif
while(1) {
u32 isr_saved, level_mask = 0;
+ u32 enabled;
- isr_saved = isr = __raw_readl(isr_reg);
+ enabled = _get_gpio_irqbank_mask(bank);
+ isr_saved = isr = __raw_readl(isr_reg) & enabled;
if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
isr &= 0x0000ffff;
- if (cpu_is_omap24xx())
+ if (cpu_is_omap24xx()) {
level_mask =
__raw_readl(bank->base +
OMAP24XX_GPIO_LEVELDETECT0) |
__raw_readl(bank->base +
OMAP24XX_GPIO_LEVELDETECT1);
+ level_mask &= enabled;
+ }
/* clear edge sensitive interrupts before handler(s) are
called so that we don't miss any interrupt occurred while
@@ -781,19 +830,54 @@ static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
/* if there is only edge sensitive GPIO pin interrupts
configured, we could unmask GPIO bank interrupt immediately */
- if (!level_mask)
+ if (!level_mask && !unmasked) {
+ unmasked = 1;
desc->chip->unmask(irq);
+ }
+ isr |= retrigger;
+ retrigger = 0;
if (!isr)
break;
gpio_irq = bank->virtual_irq_start;
for (; isr != 0; isr >>= 1, gpio_irq++) {
struct irqdesc *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->disable_depth || d->running))) {
+ 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->disable_depth) {
+ /* Level triggered interrupts
+ * won't ever be reentered
+ */
+ BUG_ON(level_mask & irq_mask);
+ d->pending = 1;
+ }
+ continue;
+ }
+ d->running = 1;
desc_handle_irq(gpio_irq, d, regs);
+ d->running = 0;
+ if (unlikely(d->pending && !d->disable_depth)) {
+ irq_mask = 1 <<
+ (gpio_irq - bank->virtual_irq_start);
+ d->pending = 0;
+ _enable_gpio_irqbank(bank, irq_mask, 1);
+ retrigger |= irq_mask;
+ }
}
if (cpu_is_omap24xx()) {
@@ -803,13 +887,14 @@ static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
_enable_gpio_irqbank(bank, isr_saved & level_mask, 1);
}
- /* if bank has any level sensitive GPIO pin interrupt
- configured, we must unmask the bank interrupt only after
- handler(s) are executed in order to avoid spurious bank
- interrupt */
- if (level_mask)
- desc->chip->unmask(irq);
}
+ /* if bank has any level sensitive GPIO pin interrupt
+ configured, we must unmask the bank interrupt only after
+ handler(s) are executed in order to avoid spurious bank
+ interrupt */
+ if (!unmasked)
+ desc->chip->unmask(irq);
+
}
static void gpio_ack_irq(unsigned int irq)