sh: add interrupt ack code to sh3

This patch adds interrupt acknowledge code for external interrupt
sources on sh3 processors. Only really required for edge triggered
interrupts, but we ack regardless of sense configuration.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh3/setup-sh3.c

@@ -35,15 +35,22 @@ static struct intc_prio_reg prio_registers[] __initdata = {
 	{ 0xa4000018, 0, 16, 4, /* IPRD */ { 0, 0, IRQ5, IRQ4 } },
 };
 
+static struct intc_mask_reg ack_registers[] __initdata = {
+	{ 0xa4000004, 0, 8, /* IRR0 */
+	  { 0, 0, IRQ5, IRQ4, IRQ3, IRQ2, IRQ1, IRQ0 } },
+};
+
 static struct intc_sense_reg sense_registers[] __initdata = {
 	{ 0xa4000010, 16, 2, { 0, 0, IRQ5, IRQ4, IRQ3, IRQ2, IRQ1, IRQ0 } },
 };
 
-static DECLARE_INTC_DESC(intc_desc_irq0123, "sh3-irq0123", vectors_irq0123,
-			 NULL, NULL, prio_registers, sense_registers);
+static DECLARE_INTC_DESC_ACK(intc_desc_irq0123, "sh3-irq0123",
+			     vectors_irq0123, NULL, NULL,
+			     prio_registers, sense_registers, ack_registers);
 
-static DECLARE_INTC_DESC(intc_desc_irq45, "sh3-irq45", vectors_irq45,
-			 NULL, NULL, prio_registers, sense_registers);
+static DECLARE_INTC_DESC_ACK(intc_desc_irq45, "sh3-irq45",
+			     vectors_irq45, NULL, NULL,
+			     prio_registers, sense_registers, ack_registers);
 
 #define INTC_ICR1		0xa4000010UL
 #define INTC_ICR1_IRQLVL	(1<<14)