[PATCH 13/25] OMAP4: PM: Add WakeupGen module as OMAP gic_arch_extn

* Santosh Shilimkar [off-list ref] [110904 06:23]:

OMAP WakeupGen is the interrupt controller extension used along
with ARM GIC to wake the CPU out from low power states on
external interrupts.

The WakeupGen unit is responsible for generating wakeup event
from the incoming interrupts and enable bits. It is implemented
in MPU always ON power domain. During normal operation,
WakeupGen delivers external interrupts directly to the GIC.

...

+	/*
+	 * Override GIC architecture specific functions to add
+	 * OMAP WakeupGen interrupt controller along with GIC
+	 */
+	gic_arch_extn.irq_mask = wakeupgen_mask;
+	gic_arch_extn.irq_unmask = wakeupgen_unmask;
+	gic_arch_extn.irq_set_wake = wakeupgen_set_wake;
+	gic_arch_extn.flags = IRQCHIP_MASK_ON_SUSPEND;

As I've commented before, there should not be any need to tweak
the wakeupgen registers for each interrupt during the runtime.

AFAIK the wakeupgen registers only need to be armed every time
before entering idle.

Regards,

Tony