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ARM: highbank: set timer prescaler to 256

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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>
This commit is contained in:
Rob Herring 2013-06-12 22:24:49 -05:00 • committed by Albert ARIBAUD
parent ec0e413f93
commit 714d1f5da5
2 changed files with 6 additions and 2 deletions
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6
arch/arm/cpu/armv7/highbank/timer.c
View file

@ -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();

2
arch/arm/include/asm/arch-armv7/systimer.h
View file

@ -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 */