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  1/*
  2 *  linux/arch/cris/kernel/time.c
  3 *
  4 *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
  5 *  Copyright (C) 1999, 2000, 2001 Axis Communications AB
  6 *
  7 * 1994-07-02    Alan Modra
  8 *	fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
  9 * 1995-03-26    Markus Kuhn
 10 *      fixed 500 ms bug at call to set_rtc_mmss, fixed DS12887
 11 *      precision CMOS clock update
 12 * 1996-05-03    Ingo Molnar
 13 *      fixed time warps in do_[slow|fast]_gettimeoffset()
 14 * 1997-09-10	Updated NTP code according to technical memorandum Jan '96
 15 *		"A Kernel Model for Precision Timekeeping" by Dave Mills
 16 *
 17 * Linux/CRIS specific code:
 18 *
 19 * Authors:    Bjorn Wesen
 20 *             Johan Adolfsson
 21 *
 22 */
 23
 24#include <asm/rtc.h>
 25#include <linux/errno.h>
 26#include <linux/module.h>
 27#include <linux/param.h>
 28#include <linux/jiffies.h>
 29#include <linux/bcd.h>
 30#include <linux/timex.h>
 31#include <linux/init.h>
 32#include <linux/profile.h>
 33#include <linux/sched.h>	/* just for sched_clock() - funny that */
 34
 35int have_rtc;  /* used to remember if we have an RTC or not */;
 36
 37#define TICK_SIZE tick
 38
 39extern unsigned long loops_per_jiffy; /* init/main.c */
 40unsigned long loops_per_usec;
 41
 42
 43#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
 44extern unsigned long do_slow_gettimeoffset(void);
 45static unsigned long (*do_gettimeoffset)(void) = do_slow_gettimeoffset;
 46
 47u32 arch_gettimeoffset(void)
 48{
 49       return do_gettimeoffset() * 1000;
 50}
 51#endif
 52
 53/*
 54 * BUG: This routine does not handle hour overflow properly; it just
 55 *      sets the minutes. Usually you'll only notice that after reboot!
 56 */
 57
 58int set_rtc_mmss(unsigned long nowtime)
 59{
 60	int retval = 0;
 61	int real_seconds, real_minutes, cmos_minutes;
 62
 63	printk(KERN_DEBUG "set_rtc_mmss(%lu)\n", nowtime);
 64
 65	if(!have_rtc)
 66		return 0;
 67
 68	cmos_minutes = CMOS_READ(RTC_MINUTES);
 69	cmos_minutes = bcd2bin(cmos_minutes);
 70
 71	/*
 72	 * since we're only adjusting minutes and seconds,
 73	 * don't interfere with hour overflow. This avoids
 74	 * messing with unknown time zones but requires your
 75	 * RTC not to be off by more than 15 minutes
 76	 */
 77	real_seconds = nowtime % 60;
 78	real_minutes = nowtime / 60;
 79	if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
 80		real_minutes += 30;		/* correct for half hour time zone */
 81	real_minutes %= 60;
 82
 83	if (abs(real_minutes - cmos_minutes) < 30) {
 84		real_seconds = bin2bcd(real_seconds);
 85		real_minutes = bin2bcd(real_minutes);
 86		CMOS_WRITE(real_seconds,RTC_SECONDS);
 87		CMOS_WRITE(real_minutes,RTC_MINUTES);
 88	} else {
 89		printk_once(KERN_NOTICE
 90		       "set_rtc_mmss: can't update from %d to %d\n",
 91		       cmos_minutes, real_minutes);
 92		retval = -1;
 93	}
 94
 95	return retval;
 96}
 97
 98/* grab the time from the RTC chip */
 99
100unsigned long
101get_cmos_time(void)
102{
103	unsigned int year, mon, day, hour, min, sec;
104	if(!have_rtc)
105		return 0;
106
107	sec = CMOS_READ(RTC_SECONDS);
108	min = CMOS_READ(RTC_MINUTES);
109	hour = CMOS_READ(RTC_HOURS);
110	day = CMOS_READ(RTC_DAY_OF_MONTH);
111	mon = CMOS_READ(RTC_MONTH);
112	year = CMOS_READ(RTC_YEAR);
113
114	sec = bcd2bin(sec);
115	min = bcd2bin(min);
116	hour = bcd2bin(hour);
117	day = bcd2bin(day);
118	mon = bcd2bin(mon);
119	year = bcd2bin(year);
120
121	if ((year += 1900) < 1970)
122		year += 100;
123
124	return mktime(year, mon, day, hour, min, sec);
125}
126
127
128int update_persistent_clock(struct timespec now)
129{
130	return set_rtc_mmss(now.tv_sec);
131}
132
133void read_persistent_clock(struct timespec *ts)
134{
135	ts->tv_sec = get_cmos_time();
136	ts->tv_nsec = 0;
137}
138
139
140extern void cris_profile_sample(struct pt_regs* regs);
141
142void
143cris_do_profile(struct pt_regs* regs)
144{
145
146#ifdef CONFIG_SYSTEM_PROFILER
147        cris_profile_sample(regs);
148#endif
149
150#ifdef CONFIG_PROFILING
151	profile_tick(CPU_PROFILING);
152#endif
153}
154
155unsigned long long sched_clock(void)
156{
157	return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ) +
158		get_ns_in_jiffie();
159}
160
161static int
162__init init_udelay(void)
163{
164	loops_per_usec = (loops_per_jiffy * HZ) / 1000000;
165	return 0;
166}
167
168__initcall(init_udelay);