[ARM] 5583/1: VIC: acknowledge software interrupts

The PrimeCell Vectored Interrupt Controller offers a way to trigger
any interrupt through software. This is a useful tool for developing,
but such software interrupt can only be acked by writing a bit in the
"software clear" register, or the handler will loop forever.  This
splits ack from mask, and acks the soft irq in case it was the source.

Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 10 insertions, 1 deletions

diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index 27714ab30f25..bc1f9ad61ff6 100644
--- a/arch/arm/common/vic.c
+++ b/arch/arm/common/vic.c
@@ -26,6 +26,15 @@
 #include <asm/mach/irq.h>
 #include <asm/hardware/vic.h>
 
+static void vic_ack_irq(unsigned int irq)
+{
+        void __iomem *base = get_irq_chip_data(irq);
+        irq &= 31;
+        writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
+        /* moreover, clear the soft-triggered, in case it was the reason */
+        writel(1 << irq, base + VIC_INT_SOFT_CLEAR);
+}
+
 static void vic_mask_irq(unsigned int irq)
 {
         void __iomem *base = get_irq_chip_data(irq);
@@ -253,7 +262,7 @@ static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg
 
 static struct irq_chip vic_chip = {
         .name   = "VIC",
-        .ack    = vic_mask_irq,
+        .ack    = vic_ack_irq,
         .mask   = vic_mask_irq,
         .unmask = vic_unmask_irq,
         .set_wake = vic_set_wake,