diff options
Diffstat (limited to 'include/asm-x86/mach-default/mach_time.h')
| -rw-r--r-- | include/asm-x86/mach-default/mach_time.h | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/include/asm-x86/mach-default/mach_time.h b/include/asm-x86/mach-default/mach_time.h deleted file mode 100644 index 31eb5de6f3dc..000000000000 --- a/include/asm-x86/mach-default/mach_time.h +++ /dev/null @@ -1,111 +0,0 @@ -/* - * include/asm-i386/mach-default/mach_time.h - * - * Machine specific set RTC function for generic. - * Split out from time.c by Osamu Tomita <tomita@cinet.co.jp> - */ -#ifndef _MACH_TIME_H -#define _MACH_TIME_H - -#include <linux/mc146818rtc.h> - -/* for check timing call set_rtc_mmss() 500ms */ -/* used in arch/i386/time.c::do_timer_interrupt() */ -#define USEC_AFTER 500000 -#define USEC_BEFORE 500000 - -/* - * In order to set the CMOS clock precisely, set_rtc_mmss has to be - * called 500 ms after the second nowtime has started, because when - * nowtime is written into the registers of the CMOS clock, it will - * jump to the next second precisely 500 ms later. Check the Motorola - * MC146818A or Dallas DS12887 data sheet for details. - * - * BUG: This routine does not handle hour overflow properly; it just - * sets the minutes. Usually you'll only notice that after reboot! - */ -static inline int mach_set_rtc_mmss(unsigned long nowtime) -{ - int retval = 0; - int real_seconds, real_minutes, cmos_minutes; - unsigned char save_control, save_freq_select; - - save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */ - CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); - - save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */ - CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); - - cmos_minutes = CMOS_READ(RTC_MINUTES); - if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) - BCD_TO_BIN(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) { - if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { - BIN_TO_BCD(real_seconds); - BIN_TO_BCD(real_minutes); - } - CMOS_WRITE(real_seconds,RTC_SECONDS); - CMOS_WRITE(real_minutes,RTC_MINUTES); - } else { - printk(KERN_WARNING - "set_rtc_mmss: can't update from %d to %d\n", - cmos_minutes, real_minutes); - retval = -1; - } - - /* The following flags have to be released exactly in this order, - * otherwise the DS12887 (popular MC146818A clone with integrated - * battery and quartz) will not reset the oscillator and will not - * update precisely 500 ms later. You won't find this mentioned in - * the Dallas Semiconductor data sheets, but who believes data - * sheets anyway ... -- Markus Kuhn - */ - CMOS_WRITE(save_control, RTC_CONTROL); - CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); - - return retval; -} - -static inline unsigned long mach_get_cmos_time(void) -{ - unsigned int year, mon, day, hour, min, sec; - - do { - 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); - } while (sec != CMOS_READ(RTC_SECONDS)); - - if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { - BCD_TO_BIN(sec); - BCD_TO_BIN(min); - BCD_TO_BIN(hour); - BCD_TO_BIN(day); - BCD_TO_BIN(mon); - BCD_TO_BIN(year); - } - - year += 1900; - if (year < 1970) - year += 100; - - return mktime(year, mon, day, hour, min, sec); -} - -#endif /* !_MACH_TIME_H */ |
