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clocksource: orion: Use atomic access for shared registers 

Replace the driver-specific thread-safe shared register API
by the recently introduced atomic_io_clear_set().

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Willy Tarreau <w@1wt.eu>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Ezequiel Garcia 2014-02-19 17:05:25 -03:00 committed by Daniel Lezcano
parent e099d01eb2
commit 0a54a06958
1 changed files with 10 additions and 18 deletions
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28
drivers/clocksource/time-orion.c
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@ -35,20 +35,6 @@
#define ORION_ONESHOT_MAX 0xfffffffe
static void __iomem *timer_base;
static DEFINE_SPINLOCK(timer_ctrl_lock);
/*
* Thread-safe access to TIMER_CTRL register
* (shared with watchdog timer)
*/
void orion_timer_ctrl_clrset(u32 clr, u32 set)
{
spin_lock(&timer_ctrl_lock);
writel((readl(timer_base + TIMER_CTRL) & ~clr) | set,
timer_base + TIMER_CTRL);
spin_unlock(&timer_ctrl_lock);
}
EXPORT_SYMBOL(orion_timer_ctrl_clrset);
/*
* Free-running clocksource handling.
@ -68,7 +54,8 @@ static int orion_clkevt_next_event(unsigned long delta,
{
/* setup and enable one-shot timer */
writel(delta, timer_base + TIMER1_VAL);
orion_timer_ctrl_clrset(TIMER1_RELOAD_EN, TIMER1_EN);
atomic_io_modify(timer_base + TIMER_CTRL,
TIMER1_RELOAD_EN | TIMER1_EN, TIMER1_EN);
return 0;
}
@ -80,10 +67,13 @@ static void orion_clkevt_mode(enum clock_event_mode mode,
/* setup and enable periodic timer at 1/HZ intervals */
writel(ticks_per_jiffy - 1, timer_base + TIMER1_RELOAD);
writel(ticks_per_jiffy - 1, timer_base + TIMER1_VAL);
orion_timer_ctrl_clrset(0, TIMER1_RELOAD_EN | TIMER1_EN);
atomic_io_modify(timer_base + TIMER_CTRL,
TIMER1_RELOAD_EN | TIMER1_EN,
TIMER1_RELOAD_EN | TIMER1_EN);
} else {
/* disable timer */
orion_timer_ctrl_clrset(TIMER1_RELOAD_EN | TIMER1_EN, 0);
atomic_io_modify(timer_base + TIMER_CTRL,
TIMER1_RELOAD_EN | TIMER1_EN, 0);
}
}
@ -131,7 +121,9 @@ static void __init orion_timer_init(struct device_node *np)
/* setup timer0 as free-running clocksource */
writel(~0, timer_base + TIMER0_VAL);
writel(~0, timer_base + TIMER0_RELOAD);
orion_timer_ctrl_clrset(0, TIMER0_RELOAD_EN | TIMER0_EN);
atomic_io_modify(timer_base + TIMER_CTRL,
TIMER0_RELOAD_EN | TIMER0_EN,
TIMER0_RELOAD_EN | TIMER0_EN);
clocksource_mmio_init(timer_base + TIMER0_VAL, "orion_clocksource",
clk_get_rate(clk), 300, 32,
clocksource_mmio_readl_down);