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m68knommu: fix ColdFire timer off by 1 

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.  Fix that.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Greg Ungerer 2007-06-08 13:46:39 -07:00 committed by Linus Torvalds
parent 4a0df2ef45
commit 4342f4ace2
1 changed files with 6 additions and 4 deletions
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10
arch/m68knommu/platform/5307/timers.c
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@ -62,10 +62,13 @@ void coldfire_tick(void)
/***************************************************************************/
static int ticks_per_intr;
void coldfire_timer_init(irq_handler_t handler)
{
__raw_writew(MCFTIMER_TMR_DISABLE, TA(MCFTIMER_TMR));
__raw_writetrr(((MCF_BUSCLK / 16) / HZ), TA(MCFTIMER_TRR));
ticks_per_intr = (MCF_BUSCLK / 16) / HZ;
__raw_writetrr(ticks_per_intr - 1, TA(MCFTIMER_TRR));
__raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, TA(MCFTIMER_TMR));
@ -81,11 +84,10 @@ void coldfire_timer_init(irq_handler_t handler)
unsigned long coldfire_timer_offset(void)
{
unsigned long trr, tcn, offset;
unsigned long tcn, offset;
tcn = __raw_readw(TA(MCFTIMER_TCN));
trr = __raw_readtrr(TA(MCFTIMER_TRR));
offset = (tcn * (1000000 / HZ)) / trr;
offset = ((tcn + 1) * (1000000 / HZ)) / ticks_per_intr;
/* Check if we just wrapped the counters and maybe missed a tick */
if ((offset < (1000000 / HZ / 2)) && mcf_timerirqpending(1))