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ARM: mxc: Add dummy_get_cycles to avoid access before init is done

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this is needed to use get_cycles with sched_clock. Accessing timer
without enabled clk will result in crash

Signed-off-by: Jan Weitzel <j.weitzel@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jan Weitzel 2011-03-17 13:44:29 +01:00 committed by Sascha Hauer
parent 350ac9ddce
commit 93b20e4fdb
1 changed files with 8 additions and 1 deletions
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9
arch/arm/plat-mxc/time.c
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@ -105,6 +105,11 @@ static void gpt_irq_acknowledge(void)
__raw_writel(V2_TSTAT_OF1, timer_base + V2_TSTAT);
}
static cycle_t dummy_get_cycles(struct clocksource *cs)
{
return 0;
}
static cycle_t mx1_2_get_cycles(struct clocksource *cs)
{
return __raw_readl(timer_base + MX1_2_TCN);
@ -118,7 +123,7 @@ static cycle_t v2_get_cycles(struct clocksource *cs)
static struct clocksource clocksource_mxc = {
.name = "mxc_timer1",
.rating = 200,
.read = mx1_2_get_cycles,
.read = dummy_get_cycles,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@ -129,6 +134,8 @@ static int __init mxc_clocksource_init(struct clk *timer_clk)
if (timer_is_v2())
clocksource_mxc.read = v2_get_cycles;
else
clocksource_mxc.read = mx1_2_get_cycles;
clocksource_register_hz(&clocksource_mxc, c);