mips/dec/time.c

1 // SPDX-License-Identifier: GPL-2.0
6  * This file contains the time handling details for PC-style clocks as
15 #include <asm/cpu-features.h>
17 #include <asm/time.h>
24 	unsigned int year, mon, day, hour, min, sec, real_year;  in read_persistent_clock64()  local
30 		sec = CMOS_READ(RTC_SECONDS);  in read_persistent_clock64()
37 		 * The PROM will reset the year to either '72 or '73.  in read_persistent_clock64()
42 	} while (sec != CMOS_READ(RTC_SECONDS));  in read_persistent_clock64()
47 		sec = bcd2bin(sec);  in read_persistent_clock64()
55 	year += real_year - 72 + 2000;  in read_persistent_clock64()
57 	ts->tv_sec = mktime64(year, mon, day, hour, min, sec);  in read_persistent_clock64()
58 	ts->tv_nsec = 0;  in read_persistent_clock64()
81 	/* stop and reset prescaler */  in update_persistent_clock64()
92 	 * messing with unknown time zones but requires your  in update_persistent_clock64()
96 	if (((abs(real_minutes - cmos_minutes) + 15) / 30) & 1)  in update_persistent_clock64()
97 		real_minutes += 30;	/* correct for half hour time zone */  in update_persistent_clock64()
100 	if (abs(real_minutes - cmos_minutes) < 30) {  in update_persistent_clock64()
111 		retval = -1;  in update_persistent_clock64()
115 	 * otherwise the DS1287 will not reset the oscillator and will not  in update_persistent_clock64()
118 	 * sheets anyway ...                           -- Markus Kuhn  in update_persistent_clock64()
146 		while (i--)  in plat_time_init()
152 		mips_hpt_frequency = (end - start) * 8;  in plat_time_init()
159 		 * event both at a time.  An accurate wall clock is more  in plat_time_init()
160 		 * important than a high-precision interval timer so only  in plat_time_init()