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authorMagnus Damm <damm@igel.co.jp>2009-08-15 02:53:25 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-08-15 12:58:45 +0900
commitf6431732f128a241b149c0aa85dfec852455ebf9 (patch)
treea345f9bcba42b13199512d00b430f985fa800138 /drivers/clocksource/sh_cmt.c
parent21bc1f024d0d4ea43fc0f2a43504e759261c7b18 (diff)
sh: CMT suspend/resume
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>
Diffstat (limited to 'drivers/clocksource/sh_cmt.c')
-rw-r--r--drivers/clocksource/sh_cmt.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index 2964f5f4a7e..6b3e0c2f33e 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -40,6 +40,7 @@ struct sh_cmt_priv {
struct platform_device *pdev;
unsigned long flags;
+ unsigned long flags_suspend;
unsigned long match_value;
unsigned long next_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 */
}
+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 = {
.probe = sh_cmt_probe,
.remove = __devexit_p(sh_cmt_remove),
.driver = {
.name = "sh_cmt",
+ .pm = &sh_cmt_dev_pm_ops,
}
};