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authorMagnus Damm <damm@igel.co.jp>2009-08-14 22:53:25 -0400
committerPaul Mundt <lethal@linux-sh.org>2009-08-14 23:58:45 -0400
commitf6431732f128a241b149c0aa85dfec852455ebf9 (patch)
treea345f9bcba42b13199512d00b430f985fa800138 /drivers/clocksource
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')
-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 2964f5f4a7ef..6b3e0c2f33e2 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -40,6 +40,7 @@ struct sh_cmt_priv {
40 struct platform_device *pdev; 40 struct platform_device *pdev;
41 41
42 unsigned long flags; 42 unsigned long flags;
43 unsigned long flags_suspend;
43 unsigned long match_value; 44 unsigned long match_value;
44 unsigned long next_match_value; 45 unsigned long next_match_value;
45 unsigned long max_match_value; 46 unsigned long max_match_value;
@@ -667,11 +668,38 @@ static int __devexit sh_cmt_remove(struct platform_device *pdev)
667 return -EBUSY; /* cannot unregister clockevent and clocksource */ 668 return -EBUSY; /* cannot unregister clockevent and clocksource */
668} 669}
669 670
671static int sh_cmt_suspend(struct device *dev)
672{
673 struct platform_device *pdev = to_platform_device(dev);
674 struct sh_cmt_priv *p = platform_get_drvdata(pdev);
675
676 /* save flag state and stop CMT channel */
677 p->flags_suspend = p->flags;
678 sh_cmt_stop(p, p->flags);
679 return 0;
680}
681
682static int sh_cmt_resume(struct device *dev)
683{
684 struct platform_device *pdev = to_platform_device(dev);
685 struct sh_cmt_priv *p = platform_get_drvdata(pdev);
686
687 /* start CMT channel from saved state */
688 sh_cmt_start(p, p->flags_suspend);
689 return 0;
690}
691
692static struct dev_pm_ops sh_cmt_dev_pm_ops = {
693 .suspend = sh_cmt_suspend,
694 .resume = sh_cmt_resume,
695};
696
670static struct platform_driver sh_cmt_device_driver = { 697static struct platform_driver sh_cmt_device_driver = {
671 .probe = sh_cmt_probe, 698 .probe = sh_cmt_probe,
672 .remove = __devexit_p(sh_cmt_remove), 699 .remove = __devexit_p(sh_cmt_remove),
673 .driver = { 700 .driver = {
674 .name = "sh_cmt", 701 .name = "sh_cmt",
702 .pm = &sh_cmt_dev_pm_ops,
675 } 703 }
676}; 704};
677 705