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Commit 15695575 authored by Baolin Wang's avatar Baolin Wang Committed by Daniel Lezcano
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clocksource/drivers/sprd: Register one always-on timer to compensate suspend time 



Since the clocksource framework has introduced one suspend clocksource to
compensate the suspend time, this patch registers one always-on timer as
the suspend clocksource.

Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent e3af6776

drivers/clocksource/timer-sprd.c

+50 −0
Original line number Diff line number Diff line
@@ -156,4 +156,54 @@ static int __init sprd_timer_init(struct device_node *np) 
	return 0;

}



static struct timer_of suspend_to = {

	.flags = TIMER_OF_BASE | TIMER_OF_CLOCK,

};



static u64 sprd_suspend_timer_read(struct clocksource *cs)

{

	return ~(u64)readl_relaxed(timer_of_base(&suspend_to) +

				   TIMER_VALUE_SHDW_LO) & cs->mask;

}



static int sprd_suspend_timer_enable(struct clocksource *cs)

{

	sprd_timer_update_counter(timer_of_base(&suspend_to),

				  TIMER_VALUE_LO_MASK);

	sprd_timer_enable(timer_of_base(&suspend_to), TIMER_CTL_PERIOD_MODE);



	return 0;

}



static void sprd_suspend_timer_disable(struct clocksource *cs)

{

	sprd_timer_disable(timer_of_base(&suspend_to));

}



static struct clocksource suspend_clocksource = {

	.name	= "sprd_suspend_timer",

	.rating	= 200,

	.read	= sprd_suspend_timer_read,

	.enable = sprd_suspend_timer_enable,

	.disable = sprd_suspend_timer_disable,

	.mask	= CLOCKSOURCE_MASK(32),

	.flags	= CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP,

};



static int __init sprd_suspend_timer_init(struct device_node *np)

{

	int ret;



	ret = timer_of_init(np, &suspend_to);

	if (ret)

		return ret;



	clocksource_register_hz(&suspend_clocksource,

				timer_of_rate(&suspend_to));



	return 0;

}



TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init);

TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-suspend-timer",

		 sprd_suspend_timer_init);