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sh: CMT: Basic runtime PM support

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Modify the SH CMT 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 01:48:57 +02:00
parent 61a53bfaa1
commit bad813831e
1 changed files with 36 additions and 8 deletions
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44
drivers/clocksource/sh_cmt.c
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@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
struct sh_cmt_priv {
void __iomem *mapbase;
@ -52,6 +53,7 @@ struct sh_cmt_priv {
struct clock_event_device ced;
struct clocksource cs;
unsigned long total_cycles;
bool cs_enabled;
};
static DEFINE_RAW_SPINLOCK(sh_cmt_lock);
@ -155,6 +157,9 @@ static int sh_cmt_enable(struct sh_cmt_priv *p, unsigned long *rate)
{
int k, ret;
pm_runtime_get_sync(&p->pdev->dev);
dev_pm_syscore_device(&p->pdev->dev, true);
/* enable clock */
ret = clk_enable(p->clk);
if (ret) {
@ -221,6 +226,9 @@ static void sh_cmt_disable(struct sh_cmt_priv *p)
/* stop clock */
clk_disable(p->clk);
dev_pm_syscore_device(&p->pdev->dev, false);
pm_runtime_put(&p->pdev->dev);
}
/* private flags */
@ -451,17 +459,26 @@ static int sh_cmt_clocksource_enable(struct clocksource *cs)
int ret;
struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
WARN_ON(p->cs_enabled);
p->total_cycles = 0;
ret = sh_cmt_start(p, FLAG_CLOCKSOURCE);
if (!ret)
if (!ret) {
__clocksource_updatefreq_hz(cs, p->rate);
p->cs_enabled = true;
}
return ret;
}
static void sh_cmt_clocksource_disable(struct clocksource *cs)
{
sh_cmt_stop(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE);
struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
WARN_ON(!p->cs_enabled);
sh_cmt_stop(p, FLAG_CLOCKSOURCE);
p->cs_enabled = false;
}
static void sh_cmt_clocksource_suspend(struct clocksource *cs)
@ -693,6 +710,7 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev)
dev_err(&p->pdev->dev, "registration failed\n");
goto err1;
}
p->cs_enabled = false;
ret = setup_irq(irq, &p->irqaction);
if (ret) {
@ -711,18 +729,17 @@ err0:
static int __devinit sh_cmt_probe(struct platform_device *pdev)
{
struct sh_cmt_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);
@ -735,8 +752,19 @@ static int __devinit sh_cmt_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_cmt_remove(struct platform_device *pdev)