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| author | Rob Herring <rob.herring@calxeda.com> | 2013-06-12 22:24:49 -0500 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2013-07-25 08:15:33 +0200 |
| commit | 714d1f5da53101ec44ab9c3d10564462b102bd8f (patch) | |
| tree | a4be03f06301058de1f645e762d97e92a70c2aa2 | |
| parent | ec0e413f934fd70968b4ca0daa530cbe8f5cdb4f (diff) | |
| download | u-boot-imx-714d1f5da53101ec44ab9c3d10564462b102bd8f.zip u-boot-imx-714d1f5da53101ec44ab9c3d10564462b102bd8f.tar.gz u-boot-imx-714d1f5da53101ec44ab9c3d10564462b102bd8f.tar.bz2 | |
ARM: highbank: set timer prescaler to 256
The 150MHz clock rate gives u-boot time functions problems and there's no
benefit to a fast clock, so lower the rate.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| -rw-r--r-- | arch/arm/cpu/armv7/highbank/timer.c | 6 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-armv7/systimer.h | 2 |
2 files changed, 6 insertions, 2 deletions
diff --git a/arch/arm/cpu/armv7/highbank/timer.c b/arch/arm/cpu/armv7/highbank/timer.c index da33d3c..d93de1e 100644 --- a/arch/arm/cpu/armv7/highbank/timer.c +++ b/arch/arm/cpu/armv7/highbank/timer.c @@ -26,7 +26,7 @@ #undef SYSTIMER_BASE #define SYSTIMER_BASE 0xFFF34000 /* Timer 0 and 1 base */ -#define SYSTIMER_RATE 150000000 +#define SYSTIMER_RATE (150000000 / 256) static ulong timestamp; static ulong lastinc; @@ -40,9 +40,11 @@ int timer_init(void) /* * Setup timer0 */ + writel(0, &systimer_base->timer0control); writel(SYSTIMER_RELOAD, &systimer_base->timer0load); writel(SYSTIMER_RELOAD, &systimer_base->timer0value); - writel(SYSTIMER_EN | SYSTIMER_32BIT, &systimer_base->timer0control); + writel(SYSTIMER_EN | SYSTIMER_32BIT | SYSTIMER_PRESC_256, + &systimer_base->timer0control); reset_timer_masked(); diff --git a/arch/arm/include/asm/arch-armv7/systimer.h b/arch/arm/include/asm/arch-armv7/systimer.h index e745e37..08125f7 100644 --- a/arch/arm/include/asm/arch-armv7/systimer.h +++ b/arch/arm/include/asm/arch-armv7/systimer.h @@ -30,6 +30,8 @@ #define SYSTIMER_RELOAD 0xFFFFFFFF #define SYSTIMER_EN (1 << 7) #define SYSTIMER_32BIT (1 << 1) +#define SYSTIMER_PRESC_16 (1 << 2) +#define SYSTIMER_PRESC_256 (1 << 3) struct systimer { u32 timer0load; /* 0x00 */ |