[ARM] pxa: initialize default interrupt priority and use ICHP for IRQ handling

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

arch/arm/mach-pxa/irq.c

@@ -120,7 +120,7 @@ static void __init pxa_init_low_gpio_irq(set_wake_t fn)
 
 void __init pxa_init_irq(int irq_nr, set_wake_t fn)
 {
-	int irq;
+	int irq, i;
 
 	pxa_internal_irq_nr = irq_nr;
 
@@ -129,6 +129,12 @@ void __init pxa_init_irq(int irq_nr, set_wake_t fn)
 		_ICLR(irq) = 0;	/* all IRQs are IRQ, not FIQ */
 	}
 
+	/* initialize interrupt priority */
+	if (cpu_is_pxa27x() || cpu_is_pxa3xx()) {
+		for (i = 0; i < irq_nr; i++)
+			IPR(i) = i | (1 << 31);
+	}
+
 	/* only unmasked interrupts kick us out of idle */
 	ICCR = 1;