[PATCH] i386: use GTOD persistent clock support

Persistent clock support: do proper timekeeping across suspend/resume, i386
arch support.

[bunk@stusta.de: cleanup]
Build-fixes-from: Andrew Morton <akpm@osdl.org>
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 53 deletions

diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index a4f67a6e682..044c17572ee 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -212,7 +212,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
 }
 
 /* not static: needed by APM */
-unsigned long get_cmos_time(void)
+unsigned long read_persistent_clock(void)
 {
 	unsigned long retval;
 	unsigned long flags;
@@ -225,7 +225,6 @@ unsigned long get_cmos_time(void)
 
 	return retval;
 }
-EXPORT_SYMBOL(get_cmos_time);
 
 static void sync_cmos_clock(unsigned long dummy);
 
@@ -278,58 +277,19 @@ void notify_arch_cmos_timer(void)
 		mod_timer(&sync_cmos_timer, jiffies + 1);
 }
 
-static long clock_cmos_diff;
-static unsigned long sleep_start;
-
-static int timer_suspend(struct sys_device *dev, pm_message_t state)
-{
-	/*
-	 * Estimate time zone so that set_time can update the clock
-	 */
-	unsigned long ctime =  get_cmos_time();
-
-	clock_cmos_diff = -ctime;
-	clock_cmos_diff += get_seconds();
-	sleep_start = ctime;
-	return 0;
-}
-
 static int timer_resume(struct sys_device *dev)
 {
-	unsigned long flags;
-	unsigned long sec;
-	unsigned long ctime = get_cmos_time();
-	long sleep_length = (ctime - sleep_start) * HZ;
-	struct timespec ts;
-
-	if (sleep_length < 0) {
-		printk(KERN_WARNING "CMOS clock skew detected in timer resume!\n");
-		/* The time after the resume must not be earlier than the time
-		 * before the suspend or some nasty things will happen
-		 */
-		sleep_length = 0;
-		ctime = sleep_start;
-	}
 #ifdef CONFIG_HPET_TIMER
 	if (is_hpet_enabled())
 		hpet_reenable();
 #endif
 	setup_pit_timer();
-
-	sec = ctime + clock_cmos_diff;
-	ts.tv_sec = sec;
-	ts.tv_nsec = 0;
-	do_settimeofday(&ts);
-	write_seqlock_irqsave(&xtime_lock, flags);
-	jiffies_64 += sleep_length;
-	write_sequnlock_irqrestore(&xtime_lock, flags);
 	touch_softlockup_watchdog();
 	return 0;
 }
 
 static struct sysdev_class timer_sysclass = {
 	.resume = timer_resume,
-	.suspend = timer_suspend,
 	set_kset_name("timer"),
 };
 
@@ -355,12 +315,6 @@ extern void (*late_time_init)(void);
 /* Duplicate of time_init() below, with hpet_enable part added */
 static void __init hpet_time_init(void)
 {
-	struct timespec ts;
-	ts.tv_sec = get_cmos_time();
-	ts.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
-
-	do_settimeofday(&ts);
-
 	if ((hpet_enable() >= 0) && hpet_use_timer) {
 		printk("Using HPET for base-timer\n");
 	}
@@ -371,7 +325,6 @@ static void __init hpet_time_init(void)
 
 void __init time_init(void)
 {
-	struct timespec ts;
 #ifdef CONFIG_HPET_TIMER
 	if (is_hpet_capable()) {
 		/*
@@ -382,10 +335,5 @@ void __init time_init(void)
 		return;
 	}
 #endif
-	ts.tv_sec = get_cmos_time();
-	ts.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
-
-	do_settimeofday(&ts);
-
 	do_time_init();
 }