sh: TMU: Basic runtime PM support

Modify the SH TMU clock source/clock event device driver to support
runtime PM at a basic level (i.e. device clocks can be disabled and
enabled, but domain power must be on, because the devices have to
be marked as "irq safe").

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>
This commit is contained in:
Rafael J. Wysocki 2012-08-06 01:48:17 +02:00
parent e2e3e4e51e
commit 61a53bfaa1

View file

@ -45,6 +45,7 @@ struct sh_tmu_priv {
struct clock_event_device ced;
struct clocksource cs;
bool cs_enabled;
unsigned int enable_count;
};
static DEFINE_RAW_SPINLOCK(sh_tmu_lock);
@ -109,7 +110,7 @@ static void sh_tmu_start_stop_ch(struct sh_tmu_priv *p, int start)
raw_spin_unlock_irqrestore(&sh_tmu_lock, flags);
}
static int sh_tmu_enable(struct sh_tmu_priv *p)
static int __sh_tmu_enable(struct sh_tmu_priv *p)
{
int ret;
@ -137,7 +138,18 @@ static int sh_tmu_enable(struct sh_tmu_priv *p)
return 0;
}
static void sh_tmu_disable(struct sh_tmu_priv *p)
static int sh_tmu_enable(struct sh_tmu_priv *p)
{
if (p->enable_count++ > 0)
return 0;
pm_runtime_get_sync(&p->pdev->dev);
dev_pm_syscore_device(&p->pdev->dev, true);
return __sh_tmu_enable(p);
}
static void __sh_tmu_disable(struct sh_tmu_priv *p)
{
/* disable channel */
sh_tmu_start_stop_ch(p, 0);
@ -149,6 +161,20 @@ static void sh_tmu_disable(struct sh_tmu_priv *p)
clk_disable(p->clk);
}
static void sh_tmu_disable(struct sh_tmu_priv *p)
{
if (WARN_ON(p->enable_count == 0))
return;
if (--p->enable_count > 0)
return;
__sh_tmu_disable(p);
dev_pm_syscore_device(&p->pdev->dev, false);
pm_runtime_put(&p->pdev->dev);
}
static void sh_tmu_set_next(struct sh_tmu_priv *p, unsigned long delta,
int periodic)
{
@ -205,11 +231,15 @@ static int sh_tmu_clocksource_enable(struct clocksource *cs)
struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
int ret;
if (WARN_ON(p->cs_enabled))
return 0;
ret = sh_tmu_enable(p);
if (!ret) {
__clocksource_updatefreq_hz(cs, p->rate);
p->cs_enabled = true;
}
return ret;
}
@ -217,7 +247,8 @@ static void sh_tmu_clocksource_disable(struct clocksource *cs)
{
struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
WARN_ON(!p->cs_enabled);
if (WARN_ON(!p->cs_enabled))
return;
sh_tmu_disable(p);
p->cs_enabled = false;
@ -227,19 +258,26 @@ 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);
if (!p->cs_enabled)
return;
pm_genpd_syscore_poweroff(&p->pdev->dev);
if (--p->enable_count == 0) {
__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);
if (!p->cs_enabled)
return;
if (p->enable_count++ == 0) {
pm_genpd_syscore_poweron(&p->pdev->dev);
__sh_tmu_enable(p);
}
}
static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
@ -434,6 +472,8 @@ static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
ret = PTR_ERR(p->clk);
goto err1;
}
p->cs_enabled = false;
p->enable_count = 0;
return sh_tmu_register(p, (char *)dev_name(&p->pdev->dev),
cfg->clockevent_rating,
@ -447,18 +487,17 @@ static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
static int __devinit sh_tmu_probe(struct platform_device *pdev)
{
struct sh_tmu_priv *p = platform_get_drvdata(pdev);
struct sh_timer_config *cfg = pdev->dev.platform_data;
int ret;
if (!is_early_platform_device(pdev)) {
struct sh_timer_config *cfg = pdev->dev.platform_data;
if (cfg->clocksource_rating || cfg->clockevent_rating)
dev_pm_syscore_device(&pdev->dev, true);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
}
if (p) {
dev_info(&pdev->dev, "kept as earlytimer\n");
return 0;
goto out;
}
p = kmalloc(sizeof(*p), GFP_KERNEL);
@ -471,8 +510,19 @@ static int __devinit sh_tmu_probe(struct platform_device *pdev)
if (ret) {
kfree(p);
platform_set_drvdata(pdev, NULL);
pm_runtime_idle(&pdev->dev);
return ret;
}
return ret;
if (is_early_platform_device(pdev))
return 0;
out:
if (cfg->clockevent_rating || cfg->clocksource_rating)
pm_runtime_irq_safe(&pdev->dev);
else
pm_runtime_idle(&pdev->dev);
return 0;
}
static int __devexit sh_tmu_remove(struct platform_device *pdev)