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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
38 lines
798 B
C
38 lines
798 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 <common.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) / (CONFIG_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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