[ARM] 3583/1: AT91RM9200 IRQ suspend/resume support

Patch from Andrew Victor

Added suspend/resume/set_wake support for the AT91RM9200's AIC interrupt
controller.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/mach-at91rm9200/irq.c b/arch/arm/mach-at91rm9200/irq.c
index cc545b2c438..70f4d7ac153 100644
--- a/arch/arm/mach-at91rm9200/irq.c
+++ b/arch/arm/mach-at91rm9200/irq.c
@@ -118,11 +118,47 @@ static int at91rm9200_irq_type(unsigned irq, unsigned type)
         return 0;
 }
 
+#ifdef CONFIG_PM
+
+static u32 wakeups;
+static u32 backups;
+
+static int at91rm9200_irq_set_wake(unsigned irq, unsigned value)
+{
+        if (unlikely(irq >= 32))
+                return -EINVAL;
+
+        if (value)
+                wakeups |= (1 << irq);
+        else
+                wakeups &= ~(1 << irq);
+
+        return 0;
+}
+
+void at91_irq_suspend(void)
+{
+        backups = at91_sys_read(AT91_AIC_IMR);
+        at91_sys_write(AT91_AIC_IDCR, backups);
+        at91_sys_write(AT91_AIC_IECR, wakeups);
+}
+
+void at91_irq_resume(void)
+{
+        at91_sys_write(AT91_AIC_IDCR, wakeups);
+        at91_sys_write(AT91_AIC_IECR, backups);
+}
+
+#else
+#define at91rm9200_irq_set_wake NULL
+#endif
+
 static struct irqchip at91rm9200_irq_chip = {
         .ack            = at91rm9200_mask_irq,
         .mask           = at91rm9200_mask_irq,
         .unmask         = at91rm9200_unmask_irq,
         .set_type       = at91rm9200_irq_type,
+        .set_wake       = at91rm9200_irq_set_wake,
 };
 
 /*