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author | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2014-10-03 19:21:06 +0900 |
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committer | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2014-10-05 14:10:09 +0900 |
commit | 5894ca007d217a2fa845facfbb62c6512396a145 (patch) | |
tree | 872971789f6bf682ff9fd9b0a0199ccd8f59febe /arch/arm/cpu/armv7/uniphier/timer.c | |
parent | 7f368553fcada0b38e8a096fcba4fcd64e0d2020 (diff) | |
download | u-boot-imx-5894ca007d217a2fa845facfbb62c6512396a145.zip u-boot-imx-5894ca007d217a2fa845facfbb62c6512396a145.tar.gz u-boot-imx-5894ca007d217a2fa845facfbb62c6512396a145.tar.bz2 |
ARM: UniPhier: add UniPhier SoC support code
These are used by Panasonic UniPhier SoC family.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Diffstat (limited to 'arch/arm/cpu/armv7/uniphier/timer.c')
-rw-r--r-- | arch/arm/cpu/armv7/uniphier/timer.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/uniphier/timer.c b/arch/arm/cpu/armv7/uniphier/timer.c new file mode 100644 index 0000000..6edc084 --- /dev/null +++ b/arch/arm/cpu/armv7/uniphier/timer.c @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2012-2014 Panasonic Corporation + * Author: Masahiro Yamada <yamada.m@jp.panasonic.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/arch/arm-mpcore.h> + +#define PERIPHCLK (50 * 1000 * 1000) /* 50 MHz */ +#define PRESCALER ((PERIPHCLK) / (CONFIG_SYS_TIMER_RATE) - 1) + +static void *get_global_timer_base(void) +{ + void *val; + + asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (val) : : "memory"); + + return val + GLOBAL_TIMER_OFFSET; +} + +unsigned long timer_read_counter(void) +{ + /* + * ARM 64bit Global Timer is too much for our purpose. + * We use only lower 32 bit of the timer counter. + */ + return readl(get_global_timer_base() + GTIMER_CNT_L); +} + +int timer_init(void) +{ + /* enable timer */ + writel(PRESCALER << 8 | 1, get_global_timer_base() + GTIMER_CTRL); + + return 0; +} |