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(KERN_WARNING 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); 169