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authorIngo Molnar <mingo@elte.hu>2008-06-16 11:16:46 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-16 11:16:46 +0200
commitcb9aa97c21c59ad01c9514d7faf45dc166fba226 (patch)
tree66a530f154db78b85f5b1406ebc51401df8d3913 /arch/m68knommu/platform/coldfire/timers.c
parent668a6c3654560aef8741642478973e205a4f02bf (diff)
parent066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff)
Merge branch 'linus' into tracing/mmiotrace-mergefixupstip-tracing-mmiotrace-mergefixups-2008-06-16_09.16_Mon
Diffstat (limited to 'arch/m68knommu/platform/coldfire/timers.c')
-rw-r--r--arch/m68knommu/platform/coldfire/timers.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/m68knommu/platform/coldfire/timers.c b/arch/m68knommu/platform/coldfire/timers.c
index ba5a9f32ebd4..454f25493491 100644
--- a/arch/m68knommu/platform/coldfire/timers.c
+++ b/arch/m68knommu/platform/coldfire/timers.c
@@ -111,7 +111,13 @@ void hw_timer_init(void)
__raw_writew(MCFTIMER_TMR_DISABLE, TA(MCFTIMER_TMR));
mcftmr_cycles_per_jiffy = FREQ / HZ;
- __raw_writetrr(mcftmr_cycles_per_jiffy, TA(MCFTIMER_TRR));
+ /*
+ * The coldfire timer runs from 0 to TRR included, then 0
+ * again and so on. It counts thus actually TRR + 1 steps
+ * for 1 tick, not TRR. So if you want n cycles,
+ * initialize TRR with n - 1.
+ */
+ __raw_writetrr(mcftmr_cycles_per_jiffy - 1, TA(MCFTIMER_TRR));
__raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, TA(MCFTIMER_TMR));