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
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
34/*
35 * timer_interrupt() needs to keep up the real-time clock,
36 * as well as call the "do_timer()" routine every clocktick
37 */
38static 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
43	do_timer(1);
44#ifndef CONFIG_SMP
45	update_process_times(user_mode(regs));
46#endif
47	profile_tick(CPU_PROFILING);
48}
49
50void 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