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| author | Nicolas Pitre <nico@cam.org> | 2005-11-08 22:43:06 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-11-08 22:43:06 +0000 |
| commit | 5285eb57c9a20d8df2569c770ff6048c3202cc91 (patch) | |
| tree | 51fa28b1941def4d0ec92f7cd4046ffa2c0bc63d /arch | |
| parent | d07ad967e3c1cb955c4f9ee6a4eba4e6e1edb1e8 (diff) | |
| download | linux-3.10-5285eb57c9a20d8df2569c770ff6048c3202cc91.tar.gz linux-3.10-5285eb57c9a20d8df2569c770ff6048c3202cc91.tar.bz2 linux-3.10-5285eb57c9a20d8df2569c770ff6048c3202cc91.zip | |
[ARM] 3135/1: harden SA11x0 and PXA2xx timer init code
Patch from Nicolas Pitre
Make it completely deterministic and leave nothing to chance
(even if it had at worst 0.001% probability of failing).
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-pxa/time.c | 8 | ||||
| -rw-r--r-- | arch/arm/mach-sa1100/time.c | 8 |
2 files changed, 10 insertions, 6 deletions
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c index 7dad3f1465e..b9b2057349e 100644 --- a/arch/arm/mach-pxa/time.c +++ b/arch/arm/mach-pxa/time.c @@ -132,11 +132,13 @@ static void __init pxa_timer_init(void) tv.tv_sec = pxa_get_rtc_time(); do_settimeofday(&tv); - OSMR0 = 0; /* set initial match at 0 */ + OIER = 0; /* disable any timer interrupts */ + OSCR = LATCH*2; /* push OSCR out of the way */ + OSMR0 = LATCH; /* set initial match */ OSSR = 0xf; /* clear status on all timers */ setup_irq(IRQ_OST0, &pxa_timer_irq); - OIER |= OIER_E0; /* enable match on timer 0 to cause interrupts */ - OSCR = 0; /* initialize free-running timer, force first match */ + OIER = OIER_E0; /* enable match on timer 0 to cause interrupts */ + OSCR = 0; /* initialize free-running timer */ } #ifdef CONFIG_NO_IDLE_HZ diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c index 47e0420623f..e4b435e634e 100644 --- a/arch/arm/mach-sa1100/time.c +++ b/arch/arm/mach-sa1100/time.c @@ -124,11 +124,13 @@ static void __init sa1100_timer_init(void) tv.tv_sec = sa1100_get_rtc_time(); do_settimeofday(&tv); - OSMR0 = 0; /* set initial match at 0 */ + OIER = 0; /* disable any timer interrupts */ + OSCR = LATCH*2; /* push OSCR out of the way */ + OSMR0 = LATCH; /* set initial match */ OSSR = 0xf; /* clear status on all timers */ setup_irq(IRQ_OST0, &sa1100_timer_irq); - OIER |= OIER_E0; /* enable match on timer 0 to cause interrupts */ - OSCR = 0; /* initialize free-running timer, force first match */ + OIER = OIER_E0; /* enable match on timer 0 to cause interrupts */ + OSCR = 0; /* initialize free-running timer */ } #ifdef CONFIG_NO_IDLE_HZ |