83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* Copyright
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* (C) 2013 Sebastian Hesselbarth <sebastian.hesselbarth@gmail.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 0x00
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#define TIMER0_EN BIT(0)
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#define TIMER0_RELOAD_EN BIT(1)
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#define TIMER1_EN BIT(2)
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#define TIMER1_RELOAD_EN BIT(3)
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#define TIMER0_RELOAD 0x10
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#define TIMER0_VAL 0x14
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#define TIMER1_RELOAD 0x18
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#define TIMER1_VAL 0x1c
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static __iomem void *timer_base;
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static uint64_t orion_clocksource_read(void)
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{
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return 0 - __raw_readl(timer_base + TIMER0_VAL);
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}
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static struct clocksource clksrc = {
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.read = orion_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 orion_timer_probe(struct device_d *dev)
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{
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struct clk *tclk;
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uint32_t val;
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timer_base = dev_request_mem_region(dev, 0);
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tclk = clk_get(dev, NULL);
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/* setup TIMER0 as free-running clock source */
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__raw_writel(~0, timer_base + TIMER0_VAL);
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__raw_writel(~0, timer_base + TIMER0_RELOAD);
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val = __raw_readl(timer_base + TIMER_CTRL);
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__raw_writel(val | TIMER0_EN | TIMER0_RELOAD_EN,
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timer_base + TIMER_CTRL);
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clksrc.mult = clocksource_hz2mult(clk_get_rate(tclk), clksrc.shift);
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init_clock(&clksrc);
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return 0;
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}
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static struct of_device_id orion_timer_dt_ids[] = {
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{ .compatible = "marvell,orion-timer", },
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{ }
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};
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static struct driver_d orion_timer_driver = {
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.name = "orion-timer",
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.probe = orion_timer_probe,
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.of_compatible = DRV_OF_COMPAT(orion_timer_dt_ids),
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};
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static int orion_timer_init(void)
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{
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return platform_driver_register(&orion_timer_driver);
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}
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postcore_initcall(orion_timer_init);
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