[deliverable/linux.git] / arch / arm / kernel / time.c

/*
 *  linux/arch/arm/kernel/time.c
 *
 *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
 *  Modifications for ARM (C) 1994-2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  This file contains the ARM-specific time handling details:
 *  reading the RTC at bootup, etc...
 *
 *  1994-07-02  Alan Modra
 *              fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
 *  1998-12-20  Updated NTP code according to technical memorandum Jan '96
 *              "A Kernel Model for Precision Timekeeping" by Dave Mills
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/timex.h>
#include <linux/errno.h>
#include <linux/profile.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
#include <linux/irq.h>

#include <linux/mc146818rtc.h>

#include <asm/leds.h>
#include <asm/thread_info.h>
#include <asm/stacktrace.h>
#include <asm/mach/time.h>

/*
 * Our system timer.
 */
struct sys_timer *system_timer;

#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
/* this needs a better home */
DEFINE_SPINLOCK(rtc_lock);

#ifdef CONFIG_RTC_DRV_CMOS_MODULE
EXPORT_SYMBOL(rtc_lock);
#endif
#endif	/* pc-style 'CMOS' RTC support */

/* change this if you have some constant time drift */
#define USECS_PER_JIFFY	(1000000/HZ)

#ifdef CONFIG_SMP
unsigned long profile_pc(struct pt_regs *regs)
{
	struct stackframe frame;

	if (!in_lock_functions(regs->ARM_pc))
		return regs->ARM_pc;

	frame.fp = regs->ARM_fp;
	frame.sp = regs->ARM_sp;
	frame.lr = regs->ARM_lr;
	frame.pc = regs->ARM_pc;
	do {
		int ret = unwind_frame(&frame);
		if (ret < 0)
			return 0;
	} while (in_lock_functions(frame.pc));

	return frame.pc;
}
EXPORT_SYMBOL(profile_pc);
#endif

/*
 * hook for setting the RTC's idea of the current time.
 */
int (*set_rtc)(void);

#ifndef CONFIG_GENERIC_TIME
static unsigned long dummy_gettimeoffset(void)
{
	return 0;
}
#endif

static unsigned long next_rtc_update;

/*
 * If we have an externally synchronized linux clock, then update
 * CMOS clock accordingly every ~11 minutes.  set_rtc() has to be
 * called as close as possible to 500 ms before the new second
 * starts.
 */
static inline void do_set_rtc(void)
{
	if (!ntp_synced() || set_rtc == NULL)
		return;

	if (next_rtc_update &&
	    time_before((unsigned long)xtime.tv_sec, next_rtc_update))
		return;

	if (xtime.tv_nsec < 500000000 - ((unsigned) tick_nsec >> 1) &&
	    xtime.tv_nsec >= 500000000 + ((unsigned) tick_nsec >> 1))
		return;

	if (set_rtc())
		/*
		 * rtc update failed.  Try again in 60s
		 */
		next_rtc_update = xtime.tv_sec + 60;
	else
		next_rtc_update = xtime.tv_sec + 660;
}

#ifdef CONFIG_LEDS

static void dummy_leds_event(led_event_t evt)
{
}

void (*leds_event)(led_event_t) = dummy_leds_event;

struct leds_evt_name {
	const char	name[8];
	int		on;
	int		off;
};

static const struct leds_evt_name evt_names[] = {
	{ "amber", led_amber_on, led_amber_off },
	{ "blue",  led_blue_on,  led_blue_off  },
	{ "green", led_green_on, led_green_off },
	{ "red",   led_red_on,   led_red_off   },
};

static ssize_t leds_store(struct sys_device *dev,
			struct sysdev_attribute *attr,
			const char *buf, size_t size)
{
	int ret = -EINVAL, len = strcspn(buf, " ");

	if (len > 0 && buf[len] == '\0')
		len--;

	if (strncmp(buf, "claim", len) == 0) {
		leds_event(led_claim);
		ret = size;
	} else if (strncmp(buf, "release", len) == 0) {
		leds_event(led_release);
		ret = size;
	} else {
		int i;

		for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
			if (strlen(evt_names[i].name) != len ||
			    strncmp(buf, evt_names[i].name, len) != 0)
				continue;
			if (strncmp(buf+len, " on", 3) == 0) {
				leds_event(evt_names[i].on);
				ret = size;
			} else if (strncmp(buf+len, " off", 4) == 0) {
				leds_event(evt_names[i].off);
				ret = size;
			}
			break;
		}
	}
	return ret;
}

static SYSDEV_ATTR(event, 0200, NULL, leds_store);

static int leds_suspend(struct sys_device *dev, pm_message_t state)
{
	leds_event(led_stop);
	return 0;
}

static int leds_resume(struct sys_device *dev)
{
	leds_event(led_start);
	return 0;
}

static int leds_shutdown(struct sys_device *dev)
{
	leds_event(led_halted);
	return 0;
}

static struct sysdev_class leds_sysclass = {
	.name		= "leds",
	.shutdown	= leds_shutdown,
	.suspend	= leds_suspend,
	.resume		= leds_resume,
};

static struct sys_device leds_device = {
	.id		= 0,
	.cls		= &leds_sysclass,
};

static int __init leds_init(void)
{
	int ret;
	ret = sysdev_class_register(&leds_sysclass);
	if (ret == 0)
		ret = sysdev_register(&leds_device);
	if (ret == 0)
		ret = sysdev_create_file(&leds_device, &attr_event);
	return ret;
}

device_initcall(leds_init);

EXPORT_SYMBOL(leds_event);
#endif

#ifdef CONFIG_LEDS_TIMER
static inline void do_leds(void)
{
	static unsigned int count = HZ/2;

	if (--count == 0) {
		count = HZ/2;
		leds_event(led_timer);
	}
}
#else
#define	do_leds()
#endif

#ifndef CONFIG_GENERIC_TIME
void do_gettimeofday(struct timeval *tv)
{
	unsigned long flags;
	unsigned long seq;
	unsigned long usec, sec;

	do {
		seq = read_seqbegin_irqsave(&xtime_lock, flags);
		usec = system_timer->offset();
		sec = xtime.tv_sec;
		usec += xtime.tv_nsec / 1000;
	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));

	/* usec may have gone up a lot: be safe */
	while (usec >= 1000000) {
		usec -= 1000000;
		sec++;
	}

	tv->tv_sec = sec;
	tv->tv_usec = usec;
}

EXPORT_SYMBOL(do_gettimeofday);

int do_settimeofday(struct timespec *tv)
{
	time_t wtm_sec, sec = tv->tv_sec;
	long wtm_nsec, nsec = tv->tv_nsec;

	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
		return -EINVAL;

	write_seqlock_irq(&xtime_lock);
	/*
	 * This is revolting. We need to set "xtime" correctly. However, the
	 * value in this location is the value at the most recent update of
	 * wall time.  Discover what correction gettimeofday() would have
	 * done, and then undo it!
	 */
	nsec -= system_timer->offset() * NSEC_PER_USEC;

	wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);

	set_normalized_timespec(&xtime, sec, nsec);
	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);

	ntp_clear();
	write_sequnlock_irq(&xtime_lock);
	clock_was_set();
	return 0;
}

EXPORT_SYMBOL(do_settimeofday);
#endif /* !CONFIG_GENERIC_TIME */

/**
 * save_time_delta - Save the offset between system time and RTC time
 * @delta: pointer to timespec to store delta
 * @rtc: pointer to timespec for current RTC time
 *
 * Return a delta between the system time and the RTC time, such
 * that system time can be restored later with restore_time_delta()
 */
void save_time_delta(struct timespec *delta, struct timespec *rtc)
{
	set_normalized_timespec(delta,
				xtime.tv_sec - rtc->tv_sec,
				xtime.tv_nsec - rtc->tv_nsec);
}
EXPORT_SYMBOL(save_time_delta);

/**
 * restore_time_delta - Restore the current system time
 * @delta: delta returned by save_time_delta()
 * @rtc: pointer to timespec for current RTC time
 */
void restore_time_delta(struct timespec *delta, struct timespec *rtc)
{
	struct timespec ts;

	set_normalized_timespec(&ts,
				delta->tv_sec + rtc->tv_sec,
				delta->tv_nsec + rtc->tv_nsec);

	do_settimeofday(&ts);
}
EXPORT_SYMBOL(restore_time_delta);

#ifndef CONFIG_GENERIC_CLOCKEVENTS
/*
 * Kernel system timer support.
 */
void timer_tick(void)
{
	profile_tick(CPU_PROFILING);
	do_leds();
	do_set_rtc();
	write_seqlock(&xtime_lock);
	do_timer(1);
	write_sequnlock(&xtime_lock);
#ifndef CONFIG_SMP
	update_process_times(user_mode(get_irq_regs()));
#endif
}
#endif

#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
static int timer_suspend(struct sys_device *dev, pm_message_t state)
{
	struct sys_timer *timer = container_of(dev, struct sys_timer, dev);

	if (timer->suspend != NULL)
		timer->suspend();

	return 0;
}

static int timer_resume(struct sys_device *dev)
{
	struct sys_timer *timer = container_of(dev, struct sys_timer, dev);

	if (timer->resume != NULL)
		timer->resume();

	return 0;
}
#else
#define timer_suspend NULL
#define timer_resume NULL
#endif

static struct sysdev_class timer_sysclass = {
	.name		= "timer",
	.suspend	= timer_suspend,
	.resume		= timer_resume,
};

static int __init timer_init_sysfs(void)
{
	int ret = sysdev_class_register(&timer_sysclass);
	if (ret == 0) {
		system_timer->dev.cls = &timer_sysclass;
		ret = sysdev_register(&system_timer->dev);
	}

	return ret;
}

device_initcall(timer_init_sysfs);

void __init time_init(void)
{
#ifndef CONFIG_GENERIC_TIME
	if (system_timer->offset == NULL)
		system_timer->offset = dummy_gettimeoffset;
#endif
	system_timer->init();
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/kernel/time.c
	3	*
	4	* Copyright (C) 1991, 1992, 1995 Linus Torvalds
	5	* Modifications for ARM (C) 1994-2001 Russell King
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This file contains the ARM-specific time handling details:
	12	* reading the RTC at bootup, etc...
	13	*
	14	* 1994-07-02 Alan Modra
	15	* fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
	16	* 1998-12-20 Updated NTP code according to technical memorandum Jan '96
	17	* "A Kernel Model for Precision Timekeeping" by Dave Mills
	18	*/
1da177e4 LT	19	#include <linux/module.h>
	20	#include <linux/kernel.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/time.h>
	23	#include <linux/init.h>
d43c36dc	24	#include <linux/sched.h>
1da177e4 LT	25	#include <linux/smp.h>
	26	#include <linux/timex.h>
	27	#include <linux/errno.h>
	28	#include <linux/profile.h>
	29	#include <linux/sysdev.h>
	30	#include <linux/timer.h>
e317c8cc	31	#include <linux/irq.h>
1da177e4	32
9ca3f07b BD	33	#include <linux/mc146818rtc.h>
9ca3f07b BD	34
1da177e4 LT	35	#include <asm/leds.h>
1da177e4 LT	36	#include <asm/thread_info.h>
2d7c11bf	37	#include <asm/stacktrace.h>
1da177e4 LT	38	#include <asm/mach/time.h>
1da177e4 LT	39
1da177e4 LT	40	/*
	41	* Our system timer.
	42	*/
	43	struct sys_timer *system_timer;
	44
9dd34948	45	#if defined(CONFIG_RTC_DRV_CMOS) \|\| defined(CONFIG_RTC_DRV_CMOS_MODULE)
1da177e4 LT	46	/* this needs a better home */
	47	DEFINE_SPINLOCK(rtc_lock);
	48
9dd34948	49	#ifdef CONFIG_RTC_DRV_CMOS_MODULE
1da177e4 LT	50	EXPORT_SYMBOL(rtc_lock);
1da177e4 LT	51	#endif
9dd34948	52	#endif /* pc-style 'CMOS' RTC support */
1da177e4 LT	53
	54	/* change this if you have some constant time drift */
	55	#define USECS_PER_JIFFY (1000000/HZ)
	56
	57	#ifdef CONFIG_SMP
	58	unsigned long profile_pc(struct pt_regs *regs)
	59	{
2d7c11bf	60	struct stackframe frame;
1da177e4	61
2d7c11bf CM	62	if (!in_lock_functions(regs->ARM_pc))
2d7c11bf CM	63	return regs->ARM_pc;
1da177e4	64
2d7c11bf CM	65	frame.fp = regs->ARM_fp;
	66	frame.sp = regs->ARM_sp;
	67	frame.lr = regs->ARM_lr;
	68	frame.pc = regs->ARM_pc;
	69	do {
	70	int ret = unwind_frame(&frame);
	71	if (ret < 0)
	72	return 0;
	73	} while (in_lock_functions(frame.pc));
	74
	75	return frame.pc;
1da177e4 LT	76	}
	77	EXPORT_SYMBOL(profile_pc);
	78	#endif
	79
	80	/*
	81	* hook for setting the RTC's idea of the current time.
	82	*/
	83	int (*set_rtc)(void);
	84
746140c7	85	#ifndef CONFIG_GENERIC_TIME
1da177e4 LT	86	static unsigned long dummy_gettimeoffset(void)
	87	{
	88	return 0;
	89	}
746140c7	90	#endif
1da177e4	91
1da177e4 LT	92	static unsigned long next_rtc_update;
	93
	94	/*
	95	* If we have an externally synchronized linux clock, then update
	96	* CMOS clock accordingly every ~11 minutes. set_rtc() has to be
	97	* called as close as possible to 500 ms before the new second
	98	* starts.
	99	*/
	100	static inline void do_set_rtc(void)
	101	{
b149ee22	102	if (!ntp_synced() \|\| set_rtc == NULL)
1da177e4 LT	103	return;
	104
	105	if (next_rtc_update &&
	106	time_before((unsigned long)xtime.tv_sec, next_rtc_update))
	107	return;
	108
	109	if (xtime.tv_nsec < 500000000 - ((unsigned) tick_nsec >> 1) &&
	110	xtime.tv_nsec >= 500000000 + ((unsigned) tick_nsec >> 1))
	111	return;
	112
	113	if (set_rtc())
	114	/*
	115	* rtc update failed. Try again in 60s
	116	*/
	117	next_rtc_update = xtime.tv_sec + 60;
	118	else
	119	next_rtc_update = xtime.tv_sec + 660;
	120	}
	121
	122	#ifdef CONFIG_LEDS
	123
	124	static void dummy_leds_event(led_event_t evt)
	125	{
	126	}
	127
	128	void (*leds_event)(led_event_t) = dummy_leds_event;
	129
	130	struct leds_evt_name {
	131	const char name[8];
	132	int on;
	133	int off;
	134	};
	135
	136	static const struct leds_evt_name evt_names[] = {
	137	{ "amber", led_amber_on, led_amber_off },
	138	{ "blue", led_blue_on, led_blue_off },
	139	{ "green", led_green_on, led_green_off },
	140	{ "red", led_red_on, led_red_off },
	141	};
	142
4a0b2b4d AK	143	static ssize_t leds_store(struct sys_device *dev,
	144	struct sysdev_attribute *attr,
	145	const char *buf, size_t size)
1da177e4 LT	146	{
	147	int ret = -EINVAL, len = strcspn(buf, " ");
	148
	149	if (len > 0 && buf[len] == '\0')
	150	len--;
	151
	152	if (strncmp(buf, "claim", len) == 0) {
	153	leds_event(led_claim);
	154	ret = size;
	155	} else if (strncmp(buf, "release", len) == 0) {
	156	leds_event(led_release);
	157	ret = size;
	158	} else {
	159	int i;
	160
	161	for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
	162	if (strlen(evt_names[i].name) != len \|\|
	163	strncmp(buf, evt_names[i].name, len) != 0)
	164	continue;
	165	if (strncmp(buf+len, " on", 3) == 0) {
	166	leds_event(evt_names[i].on);
	167	ret = size;
	168	} else if (strncmp(buf+len, " off", 4) == 0) {
	169	leds_event(evt_names[i].off);
	170	ret = size;
	171	}
	172	break;
	173	}
	174	}
	175	return ret;
	176	}
	177
	178	static SYSDEV_ATTR(event, 0200, NULL, leds_store);
	179
	180	static int leds_suspend(struct sys_device *dev, pm_message_t state)
	181	{
	182	leds_event(led_stop);
	183	return 0;
	184	}
	185
	186	static int leds_resume(struct sys_device *dev)
	187	{
	188	leds_event(led_start);
	189	return 0;
	190	}
	191
	192	static int leds_shutdown(struct sys_device *dev)
	193	{
	194	leds_event(led_halted);
	195	return 0;
	196	}
	197
	198	static struct sysdev_class leds_sysclass = {
af5ca3f4	199	.name = "leds",
1da177e4 LT	200	.shutdown = leds_shutdown,
	201	.suspend = leds_suspend,
	202	.resume = leds_resume,
	203	};
	204
	205	static struct sys_device leds_device = {
	206	.id = 0,
	207	.cls = &leds_sysclass,
	208	};
	209
	210	static int __init leds_init(void)
	211	{
	212	int ret;
	213	ret = sysdev_class_register(&leds_sysclass);
	214	if (ret == 0)
	215	ret = sysdev_register(&leds_device);
	216	if (ret == 0)
	217	ret = sysdev_create_file(&leds_device, &attr_event);
	218	return ret;
	219	}
	220
	221	device_initcall(leds_init);
	222
	223	EXPORT_SYMBOL(leds_event);
	224	#endif
	225
	226	#ifdef CONFIG_LEDS_TIMER
	227	static inline void do_leds(void)
	228	{
6d15cb42	229	static unsigned int count = HZ/2;
1da177e4 LT	230
1da177e4 LT	231	if (--count == 0) {
6d15cb42	232	count = HZ/2;
1da177e4 LT	233	leds_event(led_timer);
	234	}
	235	}
	236	#else
	237	#define do_leds()
	238	#endif
	239
746140c7	240	#ifndef CONFIG_GENERIC_TIME
1da177e4 LT	241	void do_gettimeofday(struct timeval *tv)
	242	{
	243	unsigned long flags;
	244	unsigned long seq;
8ef38609	245	unsigned long usec, sec;
1da177e4 LT	246
	247	do {
	248	seq = read_seqbegin_irqsave(&xtime_lock, flags);
	249	usec = system_timer->offset();
1da177e4 LT	250	sec = xtime.tv_sec;
	251	usec += xtime.tv_nsec / 1000;
	252	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
	253
	254	/* usec may have gone up a lot: be safe */
	255	while (usec >= 1000000) {
	256	usec -= 1000000;
	257	sec++;
	258	}
	259
	260	tv->tv_sec = sec;
	261	tv->tv_usec = usec;
	262	}
	263
	264	EXPORT_SYMBOL(do_gettimeofday);
	265
	266	int do_settimeofday(struct timespec *tv)
	267	{
	268	time_t wtm_sec, sec = tv->tv_sec;
	269	long wtm_nsec, nsec = tv->tv_nsec;
	270
	271	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
	272	return -EINVAL;
	273
	274	write_seqlock_irq(&xtime_lock);
	275	/*
	276	* This is revolting. We need to set "xtime" correctly. However, the
	277	* value in this location is the value at the most recent update of
	278	* wall time. Discover what correction gettimeofday() would have
	279	* done, and then undo it!
	280	*/
	281	nsec -= system_timer->offset() * NSEC_PER_USEC;
1da177e4 LT	282
	283	wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
	284	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
	285
	286	set_normalized_timespec(&xtime, sec, nsec);
	287	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
	288
b149ee22	289	ntp_clear();
1da177e4 LT	290	write_sequnlock_irq(&xtime_lock);
	291	clock_was_set();
	292	return 0;
	293	}
	294
	295	EXPORT_SYMBOL(do_settimeofday);
746140c7	296	#endif /* !CONFIG_GENERIC_TIME */
1da177e4 LT	297
	298	/**
	299	* save_time_delta - Save the offset between system time and RTC time
	300	* @delta: pointer to timespec to store delta
	301	* @rtc: pointer to timespec for current RTC time
	302	*
	303	* Return a delta between the system time and the RTC time, such
	304	* that system time can be restored later with restore_time_delta()
	305	*/
	306	void save_time_delta(struct timespec delta, struct timespec rtc)
	307	{
	308	set_normalized_timespec(delta,
	309	xtime.tv_sec - rtc->tv_sec,
	310	xtime.tv_nsec - rtc->tv_nsec);
	311	}
	312	EXPORT_SYMBOL(save_time_delta);
	313
	314	/**
	315	* restore_time_delta - Restore the current system time
	316	* @delta: delta returned by save_time_delta()
	317	* @rtc: pointer to timespec for current RTC time
	318	*/
	319	void restore_time_delta(struct timespec delta, struct timespec rtc)
	320	{
	321	struct timespec ts;
	322
	323	set_normalized_timespec(&ts,
	324	delta->tv_sec + rtc->tv_sec,
	325	delta->tv_nsec + rtc->tv_nsec);
	326
	327	do_settimeofday(&ts);
	328	}
	329	EXPORT_SYMBOL(restore_time_delta);
	330
9e4559dd	331	#ifndef CONFIG_GENERIC_CLOCKEVENTS
1da177e4 LT	332	/*
	333	* Kernel system timer support.
	334	*/
0cd61b68	335	void timer_tick(void)
1da177e4	336	{
e317c8cc	337	profile_tick(CPU_PROFILING);
1da177e4 LT	338	do_leds();
1da177e4 LT	339	do_set_rtc();
193c3cc1	340	write_seqlock(&xtime_lock);
3171a030	341	do_timer(1);
193c3cc1	342	write_sequnlock(&xtime_lock);
1da177e4	343	#ifndef CONFIG_SMP
c97d4869	344	update_process_times(user_mode(get_irq_regs()));
1da177e4 LT	345	#endif
1da177e4 LT	346	}
9e4559dd	347	#endif
1da177e4	348
9e4559dd	349	#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
1da177e4 LT	350	static int timer_suspend(struct sys_device *dev, pm_message_t state)
	351	{
	352	struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
	353
	354	if (timer->suspend != NULL)
	355	timer->suspend();
	356
	357	return 0;
	358	}
	359
	360	static int timer_resume(struct sys_device *dev)
	361	{
	362	struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
	363
	364	if (timer->resume != NULL)
	365	timer->resume();
	366
	367	return 0;
	368	}
	369	#else
	370	#define timer_suspend NULL
	371	#define timer_resume NULL
	372	#endif
	373
	374	static struct sysdev_class timer_sysclass = {
af5ca3f4	375	.name = "timer",
1da177e4 LT	376	.suspend = timer_suspend,
	377	.resume = timer_resume,
	378	};
	379
	380	static int __init timer_init_sysfs(void)
	381	{
	382	int ret = sysdev_class_register(&timer_sysclass);
	383	if (ret == 0) {
	384	system_timer->dev.cls = &timer_sysclass;
	385	ret = sysdev_register(&system_timer->dev);
	386	}
8749af68	387
1da177e4 LT	388	return ret;
	389	}
	390
	391	device_initcall(timer_init_sysfs);
	392
	393	void __init time_init(void)
	394	{
746140c7	395	#ifndef CONFIG_GENERIC_TIME
1da177e4 LT	396	if (system_timer->offset == NULL)
1da177e4 LT	397	system_timer->offset = dummy_gettimeoffset;
746140c7	398	#endif
1da177e4 LT	399	system_timer->init();
	400	}
	401