u-boot/arch/arm/mach-uniphier/arm32/timer.c
Masahiro Yamada fe5ea57bdb ARM: uniphier: prepare directory structure for ARMv8 SoC support
Before adding ARMv8 support, this commit refactors the directory
structure.  Move ARMv7 specific files to arch/arm/mach-uniphier/arm32
to avoid a mess by mixture of ARMv7 and ARMv8 code.  Also move the
"select CPU_V7" to the lower-level menu because we will have to
select ARM64 instead of CPU_V7 for ARMv8 SoCs.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-01 00:33:24 +09:00

39 lines
801 B
C

/*
* Copyright (C) 2012-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/io.h>
#include "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;
}