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/*
* Copyright
* (C) 2013 Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*
*/
#include <common.h>
#include <init.h>
#include <clock.h>
#include <linux/clk.h>
#include <io.h>
#define TIMER_CTRL 0x00
#define TIMER0_EN BIT(0)
#define TIMER0_RELOAD_EN BIT(1)
#define TIMER1_EN BIT(2)
#define TIMER1_RELOAD_EN BIT(3)
#define TIMER0_RELOAD 0x10
#define TIMER0_VAL 0x14
#define TIMER1_RELOAD 0x18
#define TIMER1_VAL 0x1c
static __iomem void *timer_base;
static uint64_t orion_clocksource_read(void)
{
return 0 - __raw_readl(timer_base + TIMER0_VAL);
}
static struct clocksource clksrc = {
.read = orion_clocksource_read,
.mask = CLOCKSOURCE_MASK(32),
.shift = 10,
};
static int orion_timer_probe(struct device_d *dev)
{
struct resource *iores;
struct clk *tclk;
uint32_t val;
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
timer_base = IOMEM(iores->start);
tclk = clk_get(dev, NULL);
/* setup TIMER0 as free-running clock source */
__raw_writel(~0, timer_base + TIMER0_VAL);
__raw_writel(~0, timer_base + TIMER0_RELOAD);
val = __raw_readl(timer_base + TIMER_CTRL);
__raw_writel(val | TIMER0_EN | TIMER0_RELOAD_EN,
timer_base + TIMER_CTRL);
clksrc.mult = clocksource_hz2mult(clk_get_rate(tclk), clksrc.shift);
return init_clock(&clksrc);
}
static struct of_device_id orion_timer_dt_ids[] = {
{ .compatible = "marvell,orion-timer", },
{ }
};
static struct driver_d orion_timer_driver = {
.name = "orion-timer",
.probe = orion_timer_probe,
.of_compatible = DRV_OF_COMPAT(orion_timer_dt_ids),
};
static int orion_timer_init(void)
{
return platform_driver_register(&orion_timer_driver);
}
postcore_initcall(orion_timer_init);
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