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/*
* Copyright (C) 2012 Antony Pavlov <antonynpavlov@gmail.com>
*
* This file is part of barebox.
* See file CREDITS for list of people who contributed to this project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
/**
* @file
* @brief Clocksource based on JZ475x OS timer
*/
#include <init.h>
#include <clock.h>
#include <io.h>
#include <mach/jz4750d_regs.h>
#define JZ_TIMER_CLOCK 24000000
static uint64_t jz4750_cs_read(void)
{
return (uint64_t)__raw_readl((void *)TCU_OSTCNT);
}
static struct clocksource jz4750_cs = {
.read = jz4750_cs_read,
.mask = CLOCKSOURCE_MASK(32),
};
static int clocksource_init(void)
{
clocks_calc_mult_shift(&jz4750_cs.mult, &jz4750_cs.shift,
JZ_TIMER_CLOCK, NSEC_PER_SEC, 10);
init_clock(&jz4750_cs);
__raw_writel(TCU_OSTCSR_PRESCALE1 | TCU_OSTCSR_EXT_EN,
(void *)TCU_OSTCSR);
__raw_writel(0, (void *)TCU_OSTCNT);
__raw_writel(0xffffffff, (void *)TCU_OSTDR);
/* enable timer clock */
__raw_writel(TCU_TSCR_OSTSC, (void *)TCU_TSCR);
/* start counting up */
__raw_writel(TCU_TESR_OSTST, (void *)TCU_TESR);
return 0;
}
core_initcall(clocksource_init);
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