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authorNicolas Pitre <nico@cam.org>2005-09-01 12:48:47 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-09-01 12:48:47 +0100
commit20e912680842504ab4633deaa644c2b855ad3d44 (patch)
treeb92a5c0c287c9a115a43b85f55a818996df5e319 /arch/arm/mach-sa1100
parent5c53ff088cb76dca52bdf2ef36ea63147763f9ea (diff)
downloadop-kernel-dev-20e912680842504ab4633deaa644c2b855ad3d44.zip
op-kernel-dev-20e912680842504ab4633deaa644c2b855ad3d44.tar.gz
[ARM] 2863/1: clarify comment in PXA2xx and SA1x00 timer code
Patch from Nicolas Pitre Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-sa1100')
-rw-r--r--arch/arm/mach-sa1100/time.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c
index 0eeb361..a084b38 100644
--- a/arch/arm/mach-sa1100/time.c
+++ b/arch/arm/mach-sa1100/time.c
@@ -70,15 +70,6 @@ static unsigned long sa1100_gettimeoffset (void)
return usec;
}
-/*
- * We will be entered with IRQs enabled.
- *
- * Loop until we get ahead of the free running timer.
- * This ensures an exact clock tick count and time accuracy.
- * IRQs are disabled inside the loop to ensure coherence between
- * lost_ticks (updated in do_timer()) and the match reg value, so we
- * can use do_gettimeofday() from interrupt handlers.
- */
static irqreturn_t
sa1100_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
@@ -86,6 +77,14 @@ sa1100_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
write_seqlock(&xtime_lock);
+ /*
+ * Loop until we get ahead of the free running timer.
+ * This ensures an exact clock tick count and time accuracy.
+ * Since IRQs are disabled at this point, coherence between
+ * lost_ticks(updated in do_timer()) and the match reg value is
+ * ensured, hence we can use do_gettimeofday() from interrupt
+ * handlers.
+ */
do {
timer_tick(regs);
OSSR = OSSR_M0; /* Clear match on timer 0 */
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