diff options
author | Vitaly Andrianov <vitalya@ti.com> | 2014-04-04 21:16:49 +0400 |
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committer | Tom Rini <trini@ti.com> | 2014-04-18 01:24:38 +0400 |
commit | 11bc75572218eeb7f9d9a5f189e98e328a8aeac9 (patch) | |
tree | a6e66e398bcec726ed8ec312f7ad222f81e8b450 /arch/arm/cpu/armv7/arch_timer.c | |
parent | bf411ea9f11a757cb3916f3a2e9753f4e0208672 (diff) | |
download | u-boot-11bc75572218eeb7f9d9a5f189e98e328a8aeac9.tar.xz |
arm: add support for arch timer
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>
Diffstat (limited to 'arch/arm/cpu/armv7/arch_timer.c')
-rw-r--r-- | arch/arm/cpu/armv7/arch_timer.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/arch_timer.c b/arch/arm/cpu/armv7/arch_timer.c new file mode 100644 index 0000000000..0588e2baef --- /dev/null +++ b/arch/arm/cpu/armv7/arch_timer.c @@ -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; +} |