[MIPS] use generic_handle_irq, handle_level_irq, handle_percpu_irq

Further incorporation of generic irq framework.  Replacing __do_IRQ()
by proper flow handler would make the irq handling path a bit simpler
and faster.

* use generic_handle_irq() instead of __do_IRQ().
* use handle_level_irq for obvious level-type irq chips.
* use handle_percpu_irq for irqs marked as IRQ_PER_CPU.
* setup .eoi routine for irq chips possibly used with handle_percpu_irq.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/irq_cpu.c

@@ -62,6 +62,7 @@ static struct irq_chip mips_cpu_irq_controller = {
 	.mask		= mask_mips_irq,
 	.mask_ack	= mask_mips_irq,
 	.unmask		= unmask_mips_irq,
+	.eoi		= unmask_mips_irq,
 	.end		= mips_cpu_irq_end,
 };
 
@@ -104,6 +105,7 @@ static struct irq_chip mips_mt_cpu_irq_controller = {
 	.mask		= mask_mips_mt_irq,
 	.mask_ack	= mips_mt_cpu_irq_ack,
 	.unmask		= unmask_mips_mt_irq,
+	.eoi		= unmask_mips_mt_irq,
 	.end		= mips_mt_cpu_irq_end,
 };
 
@@ -124,7 +126,8 @@ void __init mips_cpu_irq_init(int irq_base)
 			set_irq_chip(i, &mips_mt_cpu_irq_controller);
 
 	for (i = irq_base + 2; i < irq_base + 8; i++)
-		set_irq_chip(i, &mips_cpu_irq_controller);
+		set_irq_chip_and_handler(i, &mips_cpu_irq_controller,
+					 handle_level_irq);
 
 	mips_cpu_irq_base = irq_base;
 }