mirror of
https://github.com/AsahiLinux/u-boot
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65cc0e2a65
The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do not easily transition to Kconfig. In many cases they likely should come from the device tree instead. Move these out of CONFIG namespace and in to CFG namespace. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
39 lines
813 B
C
39 lines
813 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2012-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
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*/
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#include <config.h>
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#include <init.h>
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#include <linux/io.h>
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#include "arm-mpcore.h"
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#define PERIPHCLK (50 * 1000 * 1000) /* 50 MHz */
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#define PRESCALER ((PERIPHCLK) / (CFG_SYS_TIMER_RATE) - 1)
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static void *get_global_timer_base(void)
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{
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void *val;
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asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (val) : : "memory");
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return val + GLOBAL_TIMER_OFFSET;
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}
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unsigned long timer_read_counter(void)
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{
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/*
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* ARM 64bit Global Timer is too much for our purpose.
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* We use only lower 32 bit of the timer counter.
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*/
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return readl(get_global_timer_base() + GTIMER_CNT_L);
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}
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int timer_init(void)
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{
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/* enable timer */
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writel(PRESCALER << 8 | 1, get_global_timer_base() + GTIMER_CTRL);
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return 0;
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}
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