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arm: add support for arch timer

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This patch add basic support for the architecture timer found on recent
ARMv7 based SoCs.

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
This commit is contained in:
Vitaly Andrianov 2014-04-04 13:16:49 -04:00 committed by Tom Rini
parent bf411ea9f1
commit 11bc755722
2 changed files with 59 additions and 0 deletions
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1
arch/arm/cpu/armv7/Makefile
View file

@ -25,6 +25,7 @@ endif
obj-$(CONFIG_KONA) += kona-common/
obj-$(CONFIG_OMAP_COMMON) += omap-common/
obj-$(CONFIG_SYS_ARCH_TIMER) += arch_timer.o
obj-$(CONFIG_TEGRA) += tegra-common/
ifneq (,$(filter s5pc1xx exynos,$(SOC)))

58
arch/arm/cpu/armv7/arch_timer.c Normal file
View file

@ -0,0 +1,58 @@
/*
* (C) Copyright 2012-2014
* Texas Instruments Incorporated, <www.ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <div64.h>
DECLARE_GLOBAL_DATA_PTR;
int timer_init(void)
{
gd->arch.tbl = 0;
gd->arch.tbu = 0;
gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ;
return 0;
}
unsigned long long get_ticks(void)
{
ulong nowl, nowu;
asm volatile("mrrc p15, 0, %0, %1, c14" : "=r" (nowl), "=r" (nowu));
gd->arch.tbl = nowl;
gd->arch.tbu = nowu;
return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
}
ulong get_timer(ulong base)
{
return lldiv(get_ticks(), gd->arch.timer_rate_hz) - base;
}
void __udelay(unsigned long usec)
{
unsigned long long endtime;
endtime = lldiv((unsigned long long)usec * gd->arch.timer_rate_hz,
1000UL);
endtime += get_ticks();
while (get_ticks() < endtime)
;
}
ulong get_tbclk(void)
{
return gd->arch.timer_rate_hz;
}