Hello everybody,
The coldfire timer must be initialised to n - 1 if we want it to count
n cycles between each tick interrupt. This was already fixed, but has been
lost with the conversion to GENERIC_TIMER.
Signed-off-by: Philippe De Muyter <[EMAIL PROTECTED]>
diff -r 184e1bb486cf arch/m68knommu/platform/coldfire/timers.c
--- a/arch/m68knommu/platform/coldfire/timers.c Mon Jun 9 19:30:13 2008 -0700
+++ b/arch/m68knommu/platform/coldfire/timers.c Tue Jun 10 13:25:22 2008 +0200
@@ -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));
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