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[ARM] 4493/1: ns9xxx: disable a non-reloading timer before ack'ing its irq

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The HRM states that is must be done this way ...

Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Uwe Kleine-König 2007-07-19 22:13:05 +01:00 committed by Russell King
parent 3945a567d0
commit 26c671c6b7
1 changed files with 9 additions and 0 deletions
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9
arch/arm/mach-ns9xxx/irq.c
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@ -21,6 +21,15 @@ static void ns9xxx_ack_irq_timer(unsigned int irq)
{
u32 tc = SYS_TC(irq - IRQ_TIMER0);
/*
* If the timer is programmed to halt on terminal count, the
* timer must be disabled before clearing the interrupt.
*/
if (REGGET(tc, SYS_TCx, REN) == 0) {
REGSET(tc, SYS_TCx, TEN, DIS);
SYS_TC(irq - IRQ_TIMER0) = tc;
}
REGSET(tc, SYS_TCx, INTC, SET);
SYS_TC(irq - IRQ_TIMER0) = tc;