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authorDavid Brownell <david-b@pacbell.net>2007-05-08 00:33:42 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:18 -0700
commit7ca1d488ffe4817adaba61cc05b972782f7d3f91 (patch)
tree97fee4d2ddbc5be5265d99f5825e902f7a9262c1 /drivers/rtc/rtc-s3c.c
parentcd9662094edf4173e87f0452e57e4eacc228f8ff (diff)
rtc: suspend()/resume() restores system clock
RTC class suspend/resume support, re-initializing the system clock on resume from the clock used to initialize it at boot time. - The reinit-on-resume is hooked to the existing RTC_HCTOSYS config option, on the grounds that a clock good enough for init must also be good enough for re-init. - Inlining a version of the code used by ARM, to save and restore the delta between a selected RTC and the current system wall-clock time. - Removes calls to that ARM code from AT91, OMAP1, and S3C RTCs. This means that systems using those RTCs across suspend/resume will likely want to change their kernel configs to enable RTC_HCTOSYS. If HCTOSYS isn't using a second RTC (with battery?), this changes the system's initial date from Jan 1970 to the epoch this hardware uses: 1998 for AT91, 2000 for OMAP1 (assuming no split power mode), etc. This goes on top of the patch series removing "struct class_device" usage from the RTC framework. That's all needed for class suspend()/resume(). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Acked-By: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc/rtc-s3c.c')
-rw-r--r--drivers/rtc/rtc-s3c.c22
1 files changed, 0 insertions, 22 deletions
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 3617c970caa..54b61305346 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -548,37 +548,15 @@ static int ticnt_save;
static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
{
- struct rtc_time tm;
- struct timespec time;
-
- time.tv_nsec = 0;
-
/* save TICNT for anyone using periodic interrupts */
-
ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
-
- /* calculate time delta for suspend */
-
- s3c_rtc_gettime(&pdev->dev, &tm);
- rtc_tm_to_time(&tm, &time.tv_sec);
- save_time_delta(&s3c_rtc_delta, &time);
s3c_rtc_enable(pdev, 0);
-
return 0;
}
static int s3c_rtc_resume(struct platform_device *pdev)
{
- struct rtc_time tm;
- struct timespec time;
-
- time.tv_nsec = 0;
-
s3c_rtc_enable(pdev, 1);
- s3c_rtc_gettime(&pdev->dev, &tm);
- rtc_tm_to_time(&tm, &time.tv_sec);
- restore_time_delta(&s3c_rtc_delta, &time);
-
writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
return 0;
}