diff options
Diffstat (limited to 'arch/cris/kernel/time.c')
| -rw-r--r-- | arch/cris/kernel/time.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/arch/cris/kernel/time.c b/arch/cris/kernel/time.c new file mode 100644 index 00000000..4e73092e --- /dev/null +++ b/arch/cris/kernel/time.c @@ -0,0 +1,168 @@ +/* + * 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_GETTIMEOFFSET +extern 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 long +get_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); + +void +cris_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); |