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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: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
hifive-unleashed-5.1
Baolin Wang 2018-07-17 15:55:17 +08:00 committed by Daniel Lezcano
parent e3af677607
commit 1569557549
1 changed files with 50 additions and 0 deletions
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50
drivers/clocksource/timer-sprd.c
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@ -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);