From f9a49ab53a269fda39ae57063bd336b4bd62fa76 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Fri, 21 Nov 2014 17:00:01 +0100 Subject: [PATCH] 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 Cc: Daniel Lezcano Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Acked-by: Daniel Lezcano Link: https://lkml.kernel.org/r/1416585613-2113-5-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper --- drivers/clocksource/time-armada-370-xp.c | 25 ++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c index 0451e62fac7a..ff37d3abb806 100644 --- a/drivers/clocksource/time-armada-370-xp.c +++ b/drivers/clocksource/time-armada-370-xp.c @@ -43,6 +43,7 @@ #include #include #include +#include /* * 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)