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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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5
arch/powerpc/Kconfig
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@ -11,6 +11,11 @@ config PPC64
This option selects whether a 32-bit or a 64-bit kernel
will be built.
config PPC_PM_NEEDS_RTC_LIB
bool
select RTC_LIB
default y if PM
config PPC32
bool
default y if !PPC64

38
arch/powerpc/platforms/powermac/time.c
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@ -297,49 +297,11 @@ int __init via_calibrate_decr(void)
}
#endif
#ifdef CONFIG_PM
/*
* Reset the time after a sleep.
*/
static int
time_sleep_notify(struct pmu_sleep_notifier *self, int when)
{
static unsigned long time_diff;
unsigned long flags;
unsigned long seq;
struct timespec tv;
switch (when) {
case PBOOK_SLEEP_NOW:
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
time_diff = xtime.tv_sec - pmac_get_boot_time();
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
break;
case PBOOK_WAKE:
tv.tv_sec = pmac_get_boot_time() + time_diff;
tv.tv_nsec = 0;
do_settimeofday(&tv);
break;
}
return PBOOK_SLEEP_OK;
}
static struct pmu_sleep_notifier time_sleep_notifier = {
time_sleep_notify, SLEEP_LEVEL_MISC,
};
#endif /* CONFIG_PM */
/*
* Query the OF and get the decr frequency.
*/
void __init pmac_calibrate_decr(void)
{
#if defined(CONFIG_PM) && defined(CONFIG_ADB_PMU)
/* XXX why here? */
pmu_register_sleep_notifier(&time_sleep_notifier);
#endif
generic_calibrate_decr();
#ifdef CONFIG_PPC32

3
arch/powerpc/sysdev/Makefile
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@ -14,6 +14,9 @@ obj-$(CONFIG_FSL_SOC) += fsl_soc.o
obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o
obj-$(CONFIG_QUICC_ENGINE) += qe_lib/
# contains only the suspend handler for time
obj-$(CONFIG_PM) += timer.o
ifeq ($(CONFIG_PPC_MERGE),y)
obj-$(CONFIG_PPC_I8259) += i8259.o
obj-$(CONFIG_PPC_83xx) += ipic.o

70
arch/powerpc/sysdev/timer.c Normal file
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@ -0,0 +1,70 @@
/*
* 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);