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sh: CMT suspend/resume

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This patch updates the SuperH CMT driver with suspend and resume
callbacks for the suspend-to-ram case. This patch stops the CMT
channel at suspend time to avoid unwanted wake up events.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm
2009-08-15 02:53:25 +00:00
committed by Paul Mundt
parent 21bc1f024d
commit f6431732f1
1 changed files with 28 additions and 0 deletions
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28
drivers/clocksource/sh_cmt.c
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@@ -40,6 +40,7 @@ struct sh_cmt_priv {
struct platform_device *pdev; struct platform_device *pdev;
unsigned long flags; unsigned long flags;
unsigned long flags_suspend;
unsigned long match_value; unsigned long match_value;
unsigned long next_match_value; unsigned long next_match_value;
unsigned long max_match_value; unsigned long max_match_value;
@@ -667,11 +668,38 @@ static int __devexit sh_cmt_remove(struct platform_device *pdev)
return -EBUSY; /* cannot unregister clockevent and clocksource */ return -EBUSY; /* cannot unregister clockevent and clocksource */
} }
static int sh_cmt_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_cmt_priv *p = platform_get_drvdata(pdev);
/* save flag state and stop CMT channel */
p->flags_suspend = p->flags;
sh_cmt_stop(p, p->flags);
return 0;
}
static int sh_cmt_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_cmt_priv *p = platform_get_drvdata(pdev);
/* start CMT channel from saved state */
sh_cmt_start(p, p->flags_suspend);
return 0;
}
static struct dev_pm_ops sh_cmt_dev_pm_ops = {
.suspend = sh_cmt_suspend,
.resume = sh_cmt_resume,
};
static struct platform_driver sh_cmt_device_driver = { static struct platform_driver sh_cmt_device_driver = {
.probe = sh_cmt_probe, .probe = sh_cmt_probe,
.remove = __devexit_p(sh_cmt_remove), .remove = __devexit_p(sh_cmt_remove),
.driver = { .driver = {
.name = "sh_cmt", .name = "sh_cmt",
.pm = &sh_cmt_dev_pm_ops,
} }
}; };