[ARM] Add support for IRQ-based wakeup for SA11x0 CPUs

This patch adds support for enable/disable_irq_wake for the SA11x0
CPUs, allowing drivers or other code to select which IRQs are able
to wake the CPU from sleep mode.

arch/arm/mach-sa1100/irq.c

@@ -92,12 +92,22 @@ static void sa1100_low_gpio_unmask(unsigned int irq)
 	ICMR |= 1 << irq;
 }
 
+static int sa1100_low_gpio_wake(unsigned int irq, unsigned int on)
+{
+	if (on)
+		PWER |= 1 << irq;
+	else
+		PWER &= ~(1 << irq);
+	return 0;
+}
+
 static struct irqchip sa1100_low_gpio_chip = {
 	.ack		= sa1100_low_gpio_ack,
 	.mask		= sa1100_low_gpio_mask,
 	.unmask		= sa1100_low_gpio_unmask,
 	.rerun		= sa1100_manual_rerun,
 	.type		= sa1100_gpio_type,
+	.wake		= sa1100_low_gpio_wake,
 };
 
 /*
@@ -166,12 +176,22 @@ static void sa1100_high_gpio_unmask(unsigned int irq)
 	GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
 }
 
+static int sa1100_high_gpio_wake(unsigned int irq, unsigned int on)
+{
+	if (on)
+		PWER |= GPIO11_27_MASK(irq);
+	else
+		PWER &= ~GPIO11_27_MASK(irq);
+	return 0;
+}
+
 static struct irqchip sa1100_high_gpio_chip = {
 	.ack		= sa1100_high_gpio_ack,
 	.mask		= sa1100_high_gpio_mask,
 	.unmask		= sa1100_high_gpio_unmask,
 	.rerun		= sa1100_manual_rerun,
 	.type		= sa1100_gpio_type,
+	.wake		= sa1100_high_gpio_wake,
 };
 
 /*
@@ -252,5 +272,5 @@ void __init sa1100_init_irq(void)
 	 * We generally don't want the LCD IRQ being
 	 * enabled as soon as we request it.
 	 */
-	set_irq_flags(IRQ_LCD, IRQF_VALID | IRQF_NOAUTOEN);
+	set_irq_flags(IRQ_LCD, IRQF_VALID/* | IRQF_NOAUTOEN*/);
 }

arch/arm/mach-sa1100/sa1111.c

@@ -249,6 +249,19 @@ static int sa1111_type_lowirq(unsigned int irq, unsigned int flags)
 		INTPOL0 &= ~mask;
 	else
 		INTPOL0 |= mask;
+	WAKE_POL0 = INTPOL0;
+
+	return 0;
+}
+
+static int sa1111_wake_lowirq(unsigned int irq, unsigned int on)
+{
+	unsigned int mask = SA1111_IRQMASK_LO(irq);
+
+	if (on)
+		WAKE_EN0 |= mask;
+	else
+		WAKE_EN0 &= ~mask;
 
 	return 0;
 }
@@ -259,6 +272,7 @@ static struct irqchip sa1111_low_chip = {
 	.unmask		= sa1111_unmask_lowirq,
 	.rerun		= sa1111_rerun_lowirq,
 	.type		= sa1111_type_lowirq,
+	.wake		= sa1111_wake_lowirq,
 };
 
 static void sa1111_mask_highirq(unsigned int irq)
@@ -309,6 +323,19 @@ static int sa1111_type_highirq(unsigned int irq, unsigned int flags)
 		INTPOL1 &= ~mask;
 	else
 		INTPOL1 |= mask;
+	WAKE_POL1 = INTPOL1;
+
+	return 0;
+}
+
+static int sa1111_wake_highirq(unsigned int irq, unsigned int on)
+{
+	unsigned int mask = SA1111_IRQMASK_HI(irq);
+
+	if (on)
+		WAKE_EN1 |= mask;
+	else
+		WAKE_EN1 &= ~mask;
 
 	return 0;
 }
@@ -319,6 +346,7 @@ static struct irqchip sa1111_high_chip = {
 	.unmask		= sa1111_unmask_highirq,
 	.rerun		= sa1111_rerun_highirq,
 	.type		= sa1111_type_highirq,
+	.wake		= sa1111_wake_highirq,
 };
 
 static void __init sa1111_init_irq(struct sa1111_dev *sadev)