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authorRafael J. Wysocki <rjw@sisk.pl>2012-08-06 03:41:20 +0400
committerRafael J. Wysocki <rjw@sisk.pl>2012-09-04 03:36:02 +0400
commiteaa49a8cd1f98a6486413d902e7304df026a1fa9 (patch)
tree4a7a45fb9dafa742e698a5cc7d00890fb01a4b52 /drivers/clocksource
parentadc78e6b9946a4b22e22403d961f3b03c469e5d3 (diff)
downloadlinux-eaa49a8cd1f98a6486413d902e7304df026a1fa9.tar.xz
sh: TMU: Introduce clocksource/clock events suspend/resume routines
Introduce suspend/resume routines for SH TMU clock source and clock event device such that if those devices belong to a PM domain, the generic PM domains framework will be notified that the given domain may be turned off (during system suspend) or that it has to be turned on (during system resume). This change allows the A4R domain on SH7372 to be turned off during system suspend (tested on the Mackerel board) if the TMU clock source and/or clock event device is in use. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/sh_tmu.c54
1 files changed, 50 insertions, 4 deletions
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index c1b51d49d106..7d700829bb41 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
struct sh_tmu_priv {
void __iomem *mapbase;
@@ -43,6 +44,7 @@ struct sh_tmu_priv {
unsigned long periodic;
struct clock_event_device ced;
struct clocksource cs;
+ bool cs_enabled;
};
static DEFINE_RAW_SPINLOCK(sh_tmu_lock);
@@ -204,14 +206,40 @@ static int sh_tmu_clocksource_enable(struct clocksource *cs)
int ret;
ret = sh_tmu_enable(p);
- if (!ret)
+ if (!ret) {
__clocksource_updatefreq_hz(cs, p->rate);
+ p->cs_enabled = true;
+ }
return ret;
}
static void sh_tmu_clocksource_disable(struct clocksource *cs)
{
- sh_tmu_disable(cs_to_sh_tmu(cs));
+ struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
+
+ WARN_ON(!p->cs_enabled);
+
+ sh_tmu_disable(p);
+ p->cs_enabled = false;
+}
+
+static void sh_tmu_clocksource_suspend(struct clocksource *cs)
+{
+ struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
+
+ if (p->cs_enabled)
+ sh_tmu_disable(p);
+
+ pm_genpd_syscore_poweroff(&p->pdev->dev);
+}
+
+static void sh_tmu_clocksource_resume(struct clocksource *cs)
+{
+ struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
+
+ pm_genpd_syscore_poweron(&p->pdev->dev);
+ if (p->cs_enabled)
+ sh_tmu_enable(p);
}
static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
@@ -224,6 +252,8 @@ static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
cs->read = sh_tmu_clocksource_read;
cs->enable = sh_tmu_clocksource_enable;
cs->disable = sh_tmu_clocksource_disable;
+ cs->suspend = sh_tmu_clocksource_suspend;
+ cs->resume = sh_tmu_clocksource_resume;
cs->mask = CLOCKSOURCE_MASK(32);
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
@@ -301,6 +331,16 @@ static int sh_tmu_clock_event_next(unsigned long delta,
return 0;
}
+static void sh_tmu_clock_event_suspend(struct clock_event_device *ced)
+{
+ pm_genpd_syscore_poweroff(&ced_to_sh_tmu(ced)->pdev->dev);
+}
+
+static void sh_tmu_clock_event_resume(struct clock_event_device *ced)
+{
+ pm_genpd_syscore_poweron(&ced_to_sh_tmu(ced)->pdev->dev);
+}
+
static void sh_tmu_register_clockevent(struct sh_tmu_priv *p,
char *name, unsigned long rating)
{
@@ -316,6 +356,8 @@ static void sh_tmu_register_clockevent(struct sh_tmu_priv *p,
ced->cpumask = cpumask_of(0);
ced->set_next_event = sh_tmu_clock_event_next;
ced->set_mode = sh_tmu_clock_event_mode;
+ ced->suspend = sh_tmu_clock_event_suspend;
+ ced->resume = sh_tmu_clock_event_resume;
dev_info(&p->pdev->dev, "used for clock events\n");
@@ -407,8 +449,12 @@ static int __devinit sh_tmu_probe(struct platform_device *pdev)
struct sh_tmu_priv *p = platform_get_drvdata(pdev);
int ret;
- if (!is_early_platform_device(pdev))
- pm_genpd_dev_always_on(&pdev->dev, true);
+ if (!is_early_platform_device(pdev)) {
+ struct sh_timer_config *cfg = pdev->dev.platform_data;
+
+ if (cfg->clocksource_rating || cfg->clockevent_rating)
+ pm_genpd_dev_always_on(&pdev->dev, true);
+ }
if (p) {
dev_info(&pdev->dev, "kept as earlytimer\n");