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clocksource: time-armada-370-xp: add suspend/resume support 

This commit adds a set of suspend/resume syscore_ops to respectively
save and restore a number of timer registers, in order to make sure
the clockevent and clocksource devices continue to work properly
across a suspend/resume cycle.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lkml.kernel.org/r/1416585613-2113-5-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Thomas Petazzoni 2014-11-21 17:00:01 +01:00 committed by Jason Cooper
parent 0f077eb5cf
commit f9a49ab53a
1 changed files with 25 additions and 0 deletions
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25
drivers/clocksource/time-armada-370-xp.c
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@ -43,6 +43,7 @@
#include <linux/module.h>
#include <linux/sched_clock.h>
#include <linux/percpu.h>
#include <linux/syscore_ops.h>
/*
* Timer block registers.
@ -223,6 +224,28 @@ static struct notifier_block armada_370_xp_timer_cpu_nb = {
.notifier_call = armada_370_xp_timer_cpu_notify,
};
static u32 timer0_ctrl_reg, timer0_local_ctrl_reg;
static int armada_370_xp_timer_suspend(void)
{
timer0_ctrl_reg = readl(timer_base + TIMER_CTRL_OFF);
timer0_local_ctrl_reg = readl(local_base + TIMER_CTRL_OFF);
return 0;
}
static void armada_370_xp_timer_resume(void)
{
writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
writel(timer0_ctrl_reg, timer_base + TIMER_CTRL_OFF);
writel(timer0_local_ctrl_reg, local_base + TIMER_CTRL_OFF);
}
struct syscore_ops armada_370_xp_timer_syscore_ops = {
.suspend = armada_370_xp_timer_suspend,
.resume = armada_370_xp_timer_resume,
};
static void __init armada_370_xp_timer_common_init(struct device_node *np)
{
u32 clr = 0, set = 0;
@ -285,6 +308,8 @@ static void __init armada_370_xp_timer_common_init(struct device_node *np)
/* Immediately configure the timer on the boot CPU */
if (!res)
armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
register_syscore_ops(&armada_370_xp_timer_syscore_ops);
}
static void __init armada_xp_timer_init(struct device_node *np)