[linux-2.6-block.git] / arch / m68k / kernel / time.c

/*
 *  linux/arch/m68k/kernel/time.c
 *
 *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
 *
 * This file contains the m68k-specific time handling details.
 * Most of the stuff is located in the machine specific files.
 *
 * 1997-09-10	Updated NTP code according to technical memorandum Jan '96
 *		"A Kernel Model for Precision Timekeeping" by Dave Mills
 */

#include <linux/errno.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>

#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/irq_regs.h>

#include <linux/time.h>
#include <linux/timex.h>
#include <linux/profile.h>


unsigned long (*mach_random_get_entropy)(void);
EXPORT_SYMBOL_GPL(mach_random_get_entropy);


/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "xtime_update()" routine every clocktick
 */
static irqreturn_t timer_interrupt(int irq, void *dummy)
{
	xtime_update(1);
	update_process_times(user_mode(get_irq_regs()));
	profile_tick(CPU_PROFILING);

#ifdef CONFIG_HEARTBEAT
	/* use power LED as a heartbeat instead -- much more useful
	   for debugging -- based on the version for PReP by Cort */
	/* acts like an actual heart beat -- ie thump-thump-pause... */
	if (mach_heartbeat) {
	    static unsigned cnt = 0, period = 0, dist = 0;

	    if (cnt == 0 || cnt == dist)
		mach_heartbeat( 1 );
	    else if (cnt == 7 || cnt == dist+7)
		mach_heartbeat( 0 );

	    if (++cnt > period) {
		cnt = 0;
		/* The hyperbolic function below modifies the heartbeat period
		 * length in dependency of the current (5min) load. It goes
		 * through the points f(0)=126, f(1)=86, f(5)=51,
		 * f(inf)->30. */
		period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
		dist = period / 4;
	    }
	}
#endif /* CONFIG_HEARTBEAT */
	return IRQ_HANDLED;
}

void read_persistent_clock(struct timespec *ts)
{
	struct rtc_time time;
	ts->tv_sec = 0;
	ts->tv_nsec = 0;

	if (mach_hwclk) {
		mach_hwclk(0, &time);

		if ((time.tm_year += 1900) < 1970)
			time.tm_year += 100;
		ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday,
				      time.tm_hour, time.tm_min, time.tm_sec);
	}
}

#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET

static int __init rtc_init(void)
{
	struct platform_device *pdev;

	if (!mach_hwclk)
		return -ENODEV;

	pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
	return PTR_ERR_OR_ZERO(pdev);
}

module_init(rtc_init);

#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */

void __init time_init(void)
{
	mach_sched_init(timer_interrupt);
}
Commit	Line	Data
fa7f9e7f GU	1	/*
	2	* linux/arch/m68k/kernel/time.c
	3	*
	4	* Copyright (C) 1991, 1992, 1995 Linus Torvalds
	5	*
	6	* This file contains the m68k-specific time handling details.
	7	* Most of the stuff is located in the machine specific files.
	8	*
	9	* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
	10	* "A Kernel Model for Precision Timekeeping" by Dave Mills
	11	*/
	12
	13	#include <linux/errno.h>
5bc8c7cd	14	#include <linux/export.h>
fa7f9e7f GU	15	#include <linux/module.h>
	16	#include <linux/sched.h>
	17	#include <linux/kernel.h>
	18	#include <linux/param.h>
	19	#include <linux/string.h>
	20	#include <linux/mm.h>
	21	#include <linux/rtc.h>
	22	#include <linux/platform_device.h>
	23
	24	#include <asm/machdep.h>
	25	#include <asm/io.h>
	26	#include <asm/irq_regs.h>
	27
	28	#include <linux/time.h>
	29	#include <linux/timex.h>
	30	#include <linux/profile.h>
	31
017cecee GU	32
017cecee GU	33	unsigned long (*mach_random_get_entropy)(void);
5bc8c7cd	34	EXPORT_SYMBOL_GPL(mach_random_get_entropy);
017cecee GU	35
017cecee GU	36
fa7f9e7f GU	37	/*
	38	* timer_interrupt() needs to keep up the real-time clock,
	39	* as well as call the "xtime_update()" routine every clocktick
	40	*/
	41	static irqreturn_t timer_interrupt(int irq, void *dummy)
	42	{
	43	xtime_update(1);
	44	update_process_times(user_mode(get_irq_regs()));
	45	profile_tick(CPU_PROFILING);
	46
	47	#ifdef CONFIG_HEARTBEAT
	48	/* use power LED as a heartbeat instead -- much more useful
	49	for debugging -- based on the version for PReP by Cort */
	50	/* acts like an actual heart beat -- ie thump-thump-pause... */
	51	if (mach_heartbeat) {
	52	static unsigned cnt = 0, period = 0, dist = 0;
	53
	54	if (cnt == 0 \|\| cnt == dist)
	55	mach_heartbeat( 1 );
	56	else if (cnt == 7 \|\| cnt == dist+7)
	57	mach_heartbeat( 0 );
	58
	59	if (++cnt > period) {
	60	cnt = 0;
	61	/* The hyperbolic function below modifies the heartbeat period
	62	* length in dependency of the current (5min) load. It goes
	63	* through the points f(0)=126, f(1)=86, f(5)=51,
	64	* f(inf)->30. */
	65	period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
	66	dist = period / 4;
	67	}
	68	}
	69	#endif /* CONFIG_HEARTBEAT */
	70	return IRQ_HANDLED;
	71	}
	72
	73	void read_persistent_clock(struct timespec *ts)
	74	{
	75	struct rtc_time time;
	76	ts->tv_sec = 0;
	77	ts->tv_nsec = 0;
	78
	79	if (mach_hwclk) {
	80	mach_hwclk(0, &time);
	81
	82	if ((time.tm_year += 1900) < 1970)
	83	time.tm_year += 100;
	84	ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday,
	85	time.tm_hour, time.tm_min, time.tm_sec);
	86	}
	87	}
	88
b13b3f51	89	#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
fa7f9e7f	90
fa7f9e7f GU	91	static int __init rtc_init(void)
	92	{
	93	struct platform_device *pdev;
	94
	95	if (!mach_hwclk)
	96	return -ENODEV;
	97
	98	pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
8c6ffba0	99	return PTR_ERR_OR_ZERO(pdev);
fa7f9e7f GU	100	}
	101
	102	module_init(rtc_init);
	103
b13b3f51	104	#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
7b1f6207 SW	105
	106	void __init time_init(void)
	107	{
7b1f6207 SW	108	mach_sched_init(timer_interrupt);
7b1f6207 SW	109	}