From: Rob Herring <robherring2@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 05/10] ARM: highbank: set timer prescaler to 256
Date: Wed, 12 Jun 2013 22:24:49 -0500 [thread overview]
Message-ID: <1371093894-16424-5-git-send-email-robherring2@gmail.com> (raw)
In-Reply-To: <1371093894-16424-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
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>
---
v2: no change, resend
arch/arm/cpu/armv7/highbank/timer.c | 6 ++++--
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 */
--
1.8.1.2
next prev parent reply other threads:[~2013-06-13 3:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-13 3:24 [U-Boot] [PATCH v2 01/10] ARM: move interrupt_init to before relocation Rob Herring
2013-06-13 3:24 ` [U-Boot] [PATCH v2 02/10] net: calxedaxgmac: enable rx cut-thru Rob Herring
2013-06-13 3:24 ` [U-Boot] [PATCH v2 03/10] ARM: highbank: update config options Rob Herring
2013-06-13 3:24 ` [U-Boot] [PATCH v2 04/10] ARM: highbank: fix get_tbclk value to timer rate Rob Herring
2013-06-13 3:24 ` Rob Herring [this message]
2013-06-13 3:24 ` [U-Boot] [PATCH v2 06/10] ARM: highbank: avoid bss write in timer_init Rob Herring
2013-06-13 3:24 ` [U-Boot] [PATCH v2 07/10] ARM: highbank: enable reset on command timeout Rob Herring
2013-06-13 3:24 ` [U-Boot] [PATCH v2 08/10] ARM: highbank: setup peripherals based on power domain status Rob Herring
2013-06-13 3:24 ` [U-Boot] [PATCH v2 09/10] ARM: highbank: compile misc_init_r only if CONFIG_MISC_INIT_R Rob Herring
2013-06-13 3:24 ` [U-Boot] [PATCH v2 10/10] highbank: enable keyed autoboot stop Rob Herring
2013-07-25 8:52 ` [U-Boot] [PATCH v2 01/10] ARM: move interrupt_init to before relocation Albert ARIBAUD
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