[mirror_ubuntu-bionic-kernel.git] / arch / h8300 / kernel / time.c

/*
 *  linux/arch/h8300/kernel/time.c
 *
 *  Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 *  Copied/hacked from:
 *
 *  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/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/timex.h>
#include <linux/profile.h>

#include <asm/io.h>
#include <asm/target_time.h>

#define	TICK_SIZE (tick_nsec / 1000)

/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "do_timer()" routine every clocktick
 */
static void timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
{
	/* may need to kick the hardware timer */
	platform_timer_eoi();

	do_timer(1);
#ifndef CONFIG_SMP
	update_process_times(user_mode(regs));
#endif
	profile_tick(CPU_PROFILING, regs);
}

void time_init(void)
{
	unsigned int year, mon, day, hour, min, sec;

	/* FIX by dqg : Set to zero for platforms that don't have tod */
	/* without this time is undefined and can overflow time_t, causing  */
	/* very stange errors */
	year = 1980;
	mon = day = 1;
	hour = min = sec = 0;
	platform_gettod (&year, &mon, &day, &hour, &min, &sec);

	if ((year += 1900) < 1970)
		year += 100;
	xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
	xtime.tv_nsec = 0;

	platform_timer_setup(timer_interrupt);
}

/*
 * This version of gettimeofday has near microsecond resolution.
 */
void do_gettimeofday(struct timeval *tv)
{
	unsigned long flags;
	unsigned long usec, sec;

	read_lock_irqsave(&xtime_lock, flags);
	usec = 0;
	sec = xtime.tv_sec;
	usec += (xtime.tv_nsec / 1000);
	read_unlock_irqrestore(&xtime_lock, flags);

	while (usec >= 1000000) {
		usec -= 1000000;
		sec++;
	}

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

EXPORT_SYMBOL(do_gettimeofday);

int do_settimeofday(struct timespec *tv)
{
	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
		return -EINVAL;

	write_lock_irq(&xtime_lock);
	/* This is revolting. We need to set the xtime.tv_usec
	 * correctly. However, the value in this location is
	 * is value at the last tick.
	 * Discover what correction gettimeofday
	 * would have done, and then undo it!
	 */
	while (tv->tv_nsec < 0) {
		tv->tv_nsec += NSEC_PER_SEC;
		tv->tv_sec--;
	}

	xtime.tv_sec = tv->tv_sec;
	xtime.tv_nsec = tv->tv_nsec;
	ntp_clear();
	write_sequnlock_irq(&xtime_lock);
	clock_was_set();
	return 0;
}

EXPORT_SYMBOL(do_settimeofday);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/h8300/kernel/time.c
	3	*
	4	* Yoshinori Sato <ysato@users.sourceforge.jp>
	5	*
	6	* Copied/hacked from:
	7	*
	8	* linux/arch/m68k/kernel/time.c
	9	*
	10	* Copyright (C) 1991, 1992, 1995 Linus Torvalds
	11	*
	12	* This file contains the m68k-specific time handling details.
	13	* Most of the stuff is located in the machine specific files.
	14	*
	15	* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
	16	* "A Kernel Model for Precision Timekeeping" by Dave Mills
	17	*/
	18
1da177e4 LT	19	#include <linux/errno.h>
	20	#include <linux/module.h>
	21	#include <linux/sched.h>
	22	#include <linux/kernel.h>
	23	#include <linux/param.h>
	24	#include <linux/string.h>
	25	#include <linux/mm.h>
	26	#include <linux/timex.h>
	27	#include <linux/profile.h>
	28
	29	#include <asm/io.h>
	30	#include <asm/target_time.h>
	31
	32	#define TICK_SIZE (tick_nsec / 1000)
	33
1da177e4 LT	34	/*
	35	* timer_interrupt() needs to keep up the real-time clock,
	36	* as well as call the "do_timer()" routine every clocktick
	37	*/
	38	static void timer_interrupt(int irq, void dummy, struct pt_regs regs)
	39	{
	40	/* may need to kick the hardware timer */
	41	platform_timer_eoi();
	42
3171a030	43	do_timer(1);
1da177e4 LT	44	#ifndef CONFIG_SMP
	45	update_process_times(user_mode(regs));
	46	#endif
	47	profile_tick(CPU_PROFILING, regs);
	48	}
	49
	50	void time_init(void)
	51	{
	52	unsigned int year, mon, day, hour, min, sec;
	53
	54	/* FIX by dqg : Set to zero for platforms that don't have tod */
	55	/* without this time is undefined and can overflow time_t, causing */
	56	/* very stange errors */
	57	year = 1980;
	58	mon = day = 1;
	59	hour = min = sec = 0;
	60	platform_gettod (&year, &mon, &day, &hour, &min, &sec);
	61
	62	if ((year += 1900) < 1970)
	63	year += 100;
	64	xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
	65	xtime.tv_nsec = 0;
	66
	67	platform_timer_setup(timer_interrupt);
	68	}
	69
	70	/*
	71	* This version of gettimeofday has near microsecond resolution.
	72	*/
	73	void do_gettimeofday(struct timeval *tv)
	74	{
	75	unsigned long flags;
	76	unsigned long usec, sec;
	77
	78	read_lock_irqsave(&xtime_lock, flags);
	79	usec = 0;
	80	sec = xtime.tv_sec;
	81	usec += (xtime.tv_nsec / 1000);
	82	read_unlock_irqrestore(&xtime_lock, flags);
	83
	84	while (usec >= 1000000) {
	85	usec -= 1000000;
	86	sec++;
	87	}
	88
	89	tv->tv_sec = sec;
	90	tv->tv_usec = usec;
	91	}
	92
	93	EXPORT_SYMBOL(do_gettimeofday);
	94
	95	int do_settimeofday(struct timespec *tv)
	96	{
	97	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
	98	return -EINVAL;
	99
	100	write_lock_irq(&xtime_lock);
	101	/* This is revolting. We need to set the xtime.tv_usec
	102	* correctly. However, the value in this location is
	103	* is value at the last tick.
	104	* Discover what correction gettimeofday
	105	* would have done, and then undo it!
	106	*/
	107	while (tv->tv_nsec < 0) {
108	tv->tv_nsec += NSEC_PER_SEC;
109	tv->tv_sec--;
110	}
111
112	xtime.tv_sec = tv->tv_sec;
113	xtime.tv_nsec = tv->tv_nsec;
b149ee22	114	ntp_clear();
1da177e4 LT	115	write_sequnlock_irq(&xtime_lock);
	116	clock_was_set();
	117	return 0;
	118	}
	119
	120	EXPORT_SYMBOL(do_settimeofday);