[RFC v2 12/18] ARM: OMAP2+: timer: Add suspend-resume callbacks for clockevent device
From: Vaibhav Bedia <hidden>
Date: 2012-12-31 13:07:05
Also in:
linux-omap
Subsystem:
arm port, omap2+ support, the rest · Maintainers:
Russell King, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds
The current OMAP timer code registers two timers - one as clocksource and one as clockevent. AM33XX has only one usable timer in the WKUP domain so one of the timers needs suspend-resume support to restore the configuration to pre-suspend state. commit adc78e6 (timekeeping: Add suspend and resume of clock event devices) introduced .suspend and .resume callbacks for clock event devices. Leverages these callbacks to have AM33XX clockevent timer which is in not in WKUP domain to behave properly across system suspend. Signed-off-by: Vaibhav Bedia <redacted> Cc: Santosh Shilimkar <redacted> Cc: Benoit Cousson <redacted> Cc: Paul Walmsley <paul@pwsan.com> Cc: Kevin Hilman <redacted> Cc: Vaibhav Hiremath <redacted> Cc: Jon Hunter <redacted> --- v1->v2: Get rid of harcoded timer id. Note: since a platform device is not created for these timer instances and because there's very minimal change needed for restarting the timer a full blown context save and restore has been skipped. arch/arm/mach-omap2/timer.c | 33 +++++++++++++++++++++++++++++++++ 1 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 691aa67..38f9cbc 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c@@ -128,6 +128,36 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode, } } +static void omap_clkevt_suspend(struct clock_event_device *unused) +{ + char name[10]; + struct omap_hwmod *oh; + + sprintf(name, "timer%d", clkev.id); + oh = omap_hwmod_lookup(name); + if (!oh) + return; + + __omap_dm_timer_stop(&clkev, 1, clkev.rate); + omap_hwmod_idle(oh); +} + +static void omap_clkevt_resume(struct clock_event_device *unused) +{ + char name[10]; + struct omap_hwmod *oh; + + sprintf(name, "timer%d", clkev.id); + oh = omap_hwmod_lookup(name); + if (!oh) + return; + + omap_hwmod_enable(oh); + __omap_dm_timer_load_start(&clkev, + OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1); + __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW); +} + static struct clock_event_device clockevent_gpt = { .name = "gp_timer", .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
@@ -135,6 +165,8 @@ static struct clock_event_device clockevent_gpt = { .rating = 300, .set_next_event = omap2_gp_timer_set_next_event, .set_mode = omap2_gp_timer_set_mode, + .suspend = omap_clkevt_suspend, + .resume = omap_clkevt_resume, }; static struct property device_disabled = {
@@ -323,6 +355,7 @@ static void __init omap2_gp_clockevent_init(int gptimer_id, int res; clkev.errata = omap_dm_timer_get_errata(); + clkev.id = gptimer_id; /* * For clock-event timers we never read the timer counter and
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1.7.0.4