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Linux/arch/cris/kernel/time.c

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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 
 35 int have_rtc;  /* used to remember if we have an RTC or not */;
 36 
 37 #define TICK_SIZE tick
 38 
 39 extern unsigned long loops_per_jiffy; /* init/main.c */
 40 unsigned long loops_per_usec;
 41 
 42 
 43 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
 44 extern unsigned long do_slow_gettimeoffset(void);
 45 static unsigned long (*do_gettimeoffset)(void) = do_slow_gettimeoffset;
 46 
 47 u32 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 
 58 int 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 
100 unsigned long
101 get_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 
128 int update_persistent_clock(struct timespec now)
129 {
130         return set_rtc_mmss(now.tv_sec);
131 }
132 
133 void read_persistent_clock(struct timespec *ts)
134 {
135         ts->tv_sec = get_cmos_time();
136         ts->tv_nsec = 0;
137 }
138 
139 
140 extern void cris_profile_sample(struct pt_regs* regs);
141 
142 void
143 cris_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 
155 unsigned long long sched_clock(void)
156 {
157         return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ) +
158                 get_ns_in_jiffie();
159 }
160 
161 static 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 

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