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| author | Magnus Damm <damm@igel.co.jp> | 2009-08-15 02:53:25 +0000 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-08-15 12:58:45 +0900 |
| commit | f6431732f128a241b149c0aa85dfec852455ebf9 (patch) | |
| tree | a345f9bcba42b13199512d00b430f985fa800138 /drivers/clocksource/sh_cmt.c | |
| parent | 21bc1f024d0d4ea43fc0f2a43504e759261c7b18 (diff) | |
| download | linux-f6431732f128a241b149c0aa85dfec852455ebf9.tar.gz linux-f6431732f128a241b149c0aa85dfec852455ebf9.tar.bz2 linux-f6431732f128a241b149c0aa85dfec852455ebf9.zip | |
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.c | 28 |
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 { 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, } }; |