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[POWERPC] Generic time suspend/resume code

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This removes the time suspend/restore code that was done through
a PMU notifier in arch/platforms/powermac/time.c.

Instead, introduce arch/powerpc/sysdev/timer.c which creates a sys
device and handles time of day suspend/resume through that.

This should probably be replaced by using the generic RTC framework
but for now it gets rid of the arcane powermac specific hack.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Johannes Berg
2007-03-19 11:53:53 +01:00
committed by Paul Mackerras
parent ec5f77e789
commit 17e638bc28
4 changed files with 78 additions and 38 deletions
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70
arch/powerpc/sysdev/timer.c Normal file
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/*
* Common code to keep time when machine suspends.
*
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
*
* GPLv2
*/
#include <linux/time.h>
#include <asm/rtc.h>
static unsigned long suspend_rtc_time;
/*
* Reset the time after a sleep.
*/
static int timer_resume(struct sys_device *dev)
{
struct timeval tv;
struct timespec ts;
struct rtc_time cur_rtc_tm;
unsigned long cur_rtc_time, diff;
/* get current RTC time and convert to seconds */
get_rtc_time(&cur_rtc_tm);
rtc_tm_to_time(&cur_rtc_tm, &cur_rtc_time);
diff = cur_rtc_time - suspend_rtc_time;
/* adjust time of day by seconds that elapsed while
* we were suspended */
do_gettimeofday(&tv);
ts.tv_sec = tv.tv_sec + diff;
ts.tv_nsec = tv.tv_usec * NSEC_PER_USEC;
do_settimeofday(&ts);
return 0;
}
static int timer_suspend(struct sys_device *dev, pm_message_t state)
{
struct rtc_time suspend_rtc_tm;
WARN_ON(!ppc_md.get_rtc_time);
get_rtc_time(&suspend_rtc_tm);
rtc_tm_to_time(&suspend_rtc_tm, &suspend_rtc_time);
return 0;
}
static struct sysdev_class timer_sysclass = {
.resume = timer_resume,
.suspend = timer_suspend,
set_kset_name("timer"),
};
static struct sys_device device_timer = {
.id = 0,
.cls = &timer_sysclass,
};
static int time_init_device(void)
{
int error = sysdev_class_register(&timer_sysclass);
if (!error)
error = sysdev_register(&device_timer);
return error;
}
device_initcall(time_init_device);