diff options
| author | Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de> | 2007-07-19 22:13:05 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-07-20 10:01:37 +0100 |
| commit | 26c671c6b7c02bc9f9c42331e6ecbeccdf67164c (patch) | |
| tree | 6f2c57905817fca9c3650ec8e8fb6253e6ebd0ee /arch/arm/mach-ns9xxx | |
| parent | 3945a567d0c1d6721994a88f58f028c27d8249d2 (diff) | |
| download | lwn-26c671c6b7c02bc9f9c42331e6ecbeccdf67164c.tar.gz lwn-26c671c6b7c02bc9f9c42331e6ecbeccdf67164c.zip | |
[ARM] 4493/1: ns9xxx: disable a non-reloading timer before ack'ing its irq
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>
Diffstat (limited to 'arch/arm/mach-ns9xxx')
| -rw-r--r-- | arch/arm/mach-ns9xxx/irq.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/mach-ns9xxx/irq.c b/arch/arm/mach-ns9xxx/irq.c index cd8f8365b62e..b8c7b00522e6 100644 --- a/arch/arm/mach-ns9xxx/irq.c +++ b/arch/arm/mach-ns9xxx/irq.c @@ -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; |