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sh: timer: Mask bit of timer prescaler

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timer_init function sets timer prescaler bit.
The previous code so did not mask this bit, this function was to overwrite
the bit. This will fix this problem.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
This commit is contained in:
Nobuhiro Iwamatsu 2013-07-23 13:57:24 +09:00
parent 183acb7003
commit 861bd4bcf7
1 changed files with 3 additions and 1 deletions
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4
arch/sh/lib/time.c
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@ -17,6 +17,8 @@
#include <asm/io.h>
#include <sh_tmu.h>
#define TCR_TPSC 0x07
static struct tmu_regs *tmu = (struct tmu_regs *)TMU_BASE;
static u16 bit;
@ -61,7 +63,7 @@ static void tmu_timer_stop(unsigned int timer)
int timer_init(void)
{
bit = (ffs(CONFIG_SYS_TMU_CLK_DIV) >> 1) - 1;
writew(readw(&tmu->tcr0) | bit, &tmu->tcr0);
writew((readw(&tmu->tcr0) & ~TCR_TPSC) | bit, &tmu->tcr0);
tmu_timer_stop(0);
tmu_timer_start(0);