/* *  linux/arch/cris/kernel/time.c * *  Copyright (C) 1991, 1992, 1995  Linus Torvalds *  Copyright (C) 1999, 2000, 2001 Axis Communications AB * * 1994-07-02    Alan Modra *	fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime * 1995-03-26    Markus Kuhn *      fixed 500 ms bug at call to set_rtc_mmss, fixed DS12887 *      precision CMOS clock update * 1996-05-03    Ingo Molnar *      fixed time warps in do_[slow|fast]_gettimeoffset() * 1997-09-10	Updated NTP code according to technical memorandum Jan '96 *		"A Kernel Model for Precision Timekeeping" by Dave Mills * * Linux/CRIS specific code: * * Authors:    Bjorn Wesen *             Johan Adolfsson * */ #include <asm/rtc.h>#include <linux/errno.h>#include <linux/module.h>#include <linux/param.h>#include <linux/jiffies.h>#include <linux/bcd.h>#include <linux/timex.h>#include <linux/init.h>#include <linux/profile.h>#include <linux/sched.h>	/* just for sched_clock() - funny that */ int have_rtc;  /* used to remember if we have an RTC or not */; #define TICK_SIZE tick extern unsigned long loops_per_jiffy; /* init/main.c */unsigned long loops_per_usec;  #ifdef CONFIG_ARCH_USES_GETTIMEOFFSETextern unsigned long do_slow_gettimeoffset(void);static unsigned long (*do_gettimeoffset)(void) = do_slow_gettimeoffset; u32 arch_gettimeoffset(void){       return do_gettimeoffset() * 1000;}#endif /* * BUG: This routine does not handle hour overflow properly; it just *      sets the minutes. Usually you'll only notice that after reboot! */ int set_rtc_mmss(unsigned long nowtime){	int retval = 0;	int real_seconds, real_minutes, cmos_minutes; 	printk(KERN_DEBUG "set_rtc_mmss(%lu)\n", nowtime); 	if(!have_rtc)		return 0; 	cmos_minutes = CMOS_READ(RTC_MINUTES);	cmos_minutes = bcd2bin(cmos_minutes); 	/*	 * since we're only adjusting minutes and seconds,	 * don't interfere with hour overflow. This avoids	 * messing with unknown time zones but requires your	 * RTC not to be off by more than 15 minutes	 */	real_seconds = nowtime % 60;	real_minutes = nowtime / 60;	if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)		real_minutes += 30;		/* correct for half hour time zone */	real_minutes %= 60; 	if (abs(real_minutes - cmos_minutes) < 30) {		real_seconds = bin2bcd(real_seconds);		real_minutes = bin2bcd(real_minutes);		CMOS_WRITE(real_seconds,RTC_SECONDS);		CMOS_WRITE(real_minutes,RTC_MINUTES);	} else {		printk_once(KERN_NOTICE		       "set_rtc_mmss: can't update from %d to %d\n",		       cmos_minutes, real_minutes);		retval = -1;	} 	return retval;} /* grab the time from the RTC chip */ unsigned longget_cmos_time(void){	unsigned int year, mon, day, hour, min, sec;	if(!have_rtc)		return 0; 	sec = CMOS_READ(RTC_SECONDS);	min = CMOS_READ(RTC_MINUTES);	hour = CMOS_READ(RTC_HOURS);	day = CMOS_READ(RTC_DAY_OF_MONTH);	mon = CMOS_READ(RTC_MONTH);	year = CMOS_READ(RTC_YEAR); 	sec = bcd2bin(sec);	min = bcd2bin(min);	hour = bcd2bin(hour);	day = bcd2bin(day);	mon = bcd2bin(mon);	year = bcd2bin(year); 	if ((year += 1900) < 1970)		year += 100; 	return mktime(year, mon, day, hour, min, sec);}  int update_persistent_clock(struct timespec now){	return set_rtc_mmss(now.tv_sec);} void read_persistent_clock(struct timespec *ts){	ts->tv_sec = get_cmos_time();	ts->tv_nsec = 0;}  extern void cris_profile_sample(struct pt_regs* regs); voidcris_do_profile(struct pt_regs* regs){ #ifdef CONFIG_SYSTEM_PROFILER        cris_profile_sample(regs);#endif #ifdef CONFIG_PROFILING	profile_tick(CPU_PROFILING);#endif} unsigned long long sched_clock(void){	return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ) +		get_ns_in_jiffie();} static int__init init_udelay(void){	loops_per_usec = (loops_per_jiffy * HZ) / 1000000;	return 0;} __initcall(init_udelay);