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https://github.com/brain-hackers/u-boot-brain
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5eaa215607
Apparently, CONFIG_SYS_HZ must be 1000. Change this, and fix the timer driver to conform to this. Have the timer implementation export a custom API get_timer_us() for use by the BCM2835 MMC API, which needs us resolution for a HW workaround. Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
/*
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* (C) Copyright 2012 Stephen Warren
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/timer.h>
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int timer_init(void)
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{
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return 0;
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}
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ulong get_timer_us(ulong base)
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{
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struct bcm2835_timer_regs *regs =
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(struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR;
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return readl(®s->clo) - base;
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}
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ulong get_timer(ulong base)
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{
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ulong us = get_timer_us(0);
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us /= (1000000 / CONFIG_SYS_HZ);
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us -= base;
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return us;
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}
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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ulong get_tbclk(void)
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{
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return CONFIG_SYS_HZ;
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}
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void __udelay(unsigned long usec)
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{
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ulong endtime;
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signed long diff;
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endtime = get_timer_us(0) + usec;
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do {
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ulong now = get_timer_us(0);
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diff = endtime - now;
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} while (diff >= 0);
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}
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