[ARM] 4545/1: ns9xxx: simplify irq ack'ing

Now the drivers are responsible to clear the irq in the respective
device, which seems to be the normal thing to do.

So the ack'ing of the timer irq moved to time.c.

Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/arm/mach-ns9xxx/time.c b/arch/arm/mach-ns9xxx/time.c
index b97d0c54a388..3327d302618d 100644
--- a/arch/arm/mach-ns9xxx/time.c
+++ b/arch/arm/mach-ns9xxx/time.c
@@ -24,10 +24,24 @@ static u32 usecs_per_tick;
 static irqreturn_t
 ns9xxx_timer_interrupt(int irq, void *dev_id)
 {
+        int timerno = irq - IRQ_TIMER0;
+        u32 tc;
+
         write_seqlock(&xtime_lock);
         timer_tick();
         write_sequnlock(&xtime_lock);
 
+        /* clear irq */
+        tc = SYS_TC(timerno);
+        if (REGGET(tc, SYS_TCx, REN) == SYS_TCx_REN_DIS) {
+                REGSET(tc, SYS_TCx, TEN, DIS);
+                SYS_TC(timerno) = tc;
+        }
+        REGSET(tc, SYS_TCx, INTC, SET);
+        SYS_TC(timerno) = tc;
+        REGSET(tc, SYS_TCx, INTC, UNSET);
+        SYS_TC(timerno) = tc;
+
         return IRQ_HANDLED;
 }