91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*
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* Copyright (C) 2013 Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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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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#include <common.h>
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#include <init.h>
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#include <clock.h>
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#include <linux/clk.h>
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#include <io.h>
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#define TIMER_CTRL_OFF 0x0000
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#define TIMER0_EN 0x0001
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#define TIMER0_RELOAD_EN 0x0002
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#define TIMER0_25MHZ 0x0800
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#define TIMER0_DIV(div) ((div) << 19)
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#define TIMER1_EN 0x0004
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#define TIMER1_RELOAD_EN 0x0008
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#define TIMER1_25MHZ 0x1000
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#define TIMER1_DIV(div) ((div) << 22)
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#define TIMER_EVENTS_STATUS 0x0004
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#define TIMER0_CLR_MASK (~0x1)
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#define TIMER1_CLR_MASK (~0x100)
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#define TIMER0_RELOAD_OFF 0x0010
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#define TIMER0_VAL_OFF 0x0014
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#define TIMER1_RELOAD_OFF 0x0018
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#define TIMER1_VAL_OFF 0x001c
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#define TIMER_DIVIDER_SHIFT 5
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static __iomem void *timer_base;
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uint64_t mvebu_clocksource_read(void)
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{
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return __raw_readl(timer_base + TIMER0_VAL_OFF);
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}
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static struct clocksource cs = {
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.read = mvebu_clocksource_read,
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.mask = CLOCKSOURCE_MASK(32),
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.shift = 10,
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};
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static int mvebu_timer_probe(struct device_d *dev)
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{
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struct clk *tclk;
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u32 val;
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timer_base = dev_request_mem_region(dev, 0);
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tclk = clk_get(dev, "tclk");
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val = __raw_readl(timer_base + TIMER_CTRL_OFF);
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val &= ~TIMER0_25MHZ;
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__raw_writel(val, timer_base + TIMER_CTRL_OFF);
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__raw_writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
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__raw_writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
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val = __raw_readl(timer_base + TIMER_CTRL_OFF);
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val |= TIMER0_EN | TIMER0_RELOAD_EN | TIMER0_DIV(TIMER_DIVIDER_SHIFT);
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__raw_writel(val, timer_base + TIMER_CTRL_OFF);
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cs.mult = clocksource_hz2mult(clk_get_rate(tclk), cs.shift);
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init_clock(&cs);
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return 0;
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}
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static struct driver_d mvebu_timer_driver = {
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.name = "mvebu-timer",
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.probe = mvebu_timer_probe,
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};
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static int mvebu_timer_init(void)
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{
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return platform_driver_register(&mvebu_timer_driver);
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}
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postcore_initcall(mvebu_timer_init);
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