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