60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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* Copyright (C) 2012 Antony Pavlov <antonynpavlov@gmail.com>
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*
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* This file is part of barebox.
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* See file CREDITS for list of people who contributed to this project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* 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,
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* but 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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*/
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/**
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* @file
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* @brief Clocksource based on JZ475x OS timer
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*/
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#include <init.h>
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#include <clock.h>
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#include <io.h>
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#include <mach/jz4750d_regs.h>
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#define JZ_TIMER_CLOCK 24000000
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static uint64_t jz4750_cs_read(void)
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{
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return (uint64_t)__raw_readl((void *)TCU_OSTCNT);
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}
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static struct clocksource jz4750_cs = {
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.read = jz4750_cs_read,
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.mask = CLOCKSOURCE_MASK(32),
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};
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static int clocksource_init(void)
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{
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clocks_calc_mult_shift(&jz4750_cs.mult, &jz4750_cs.shift,
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JZ_TIMER_CLOCK, NSEC_PER_SEC, 10);
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init_clock(&jz4750_cs);
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__raw_writel(TCU_OSTCSR_PRESCALE1 | TCU_OSTCSR_EXT_EN,
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(void *)TCU_OSTCSR);
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__raw_writel(0, (void *)TCU_OSTCNT);
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__raw_writel(0xffffffff, (void *)TCU_OSTDR);
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/* enable timer clock */
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__raw_writel(TCU_TSCR_OSTSC, (void *)TCU_TSCR);
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/* start counting up */
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__raw_writel(TCU_TESR_OSTST, (void *)TCU_TESR);
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return 0;
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}
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core_initcall(clocksource_init);
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