2 * linux/arch/m68knommu/kernel/time.c
4 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 * This file contains the m68k-specific time handling details.
7 * Most of the stuff is located in the machine specific files.
9 * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
10 * "A Kernel Model for Precision Timekeeping" by Dave Mills
13 #include <linux/errno.h>
14 #include <linux/module.h>
15 #include <linux/sched.h>
16 #include <linux/kernel.h>
17 #include <linux/param.h>
18 #include <linux/string.h>
20 #include <linux/profile.h>
21 #include <linux/time.h>
22 #include <linux/timex.h>
24 #include <asm/machdep.h>
25 #include <asm/irq_regs.h>
27 #define TICK_SIZE (tick_nsec / 1000)
29 static inline int set_rtc_mmss(unsigned long nowtime)
31 if (mach_set_clock_mmss)
32 return mach_set_clock_mmss (nowtime);
37 * timer_interrupt() needs to keep up the real-time clock,
38 * as well as call the "do_timer()" routine every clocktick
40 irqreturn_t arch_timer_interrupt(int irq, void *dummy)
44 profile_tick(CPU_PROFILING);
46 write_seqlock(&xtime_lock);
50 write_sequnlock(&xtime_lock);
53 update_process_times(user_mode(get_irq_regs()));
58 static unsigned long read_rtc_mmss(void)
60 unsigned int year, mon, day, hour, min, sec;
63 mach_gettod(&year, &mon, &day, &hour, &min, &sec);
65 year = mon = day = hour = min = sec = 0;
67 if ((year += 1900) < 1970)
70 return mktime(year, mon, day, hour, min, sec);;
73 unsigned long read_persistent_clock(void)
75 return read_rtc_mmss();
78 int update_persistent_clock(struct timespec now)
80 return set_rtc_mmss(now.tv_sec);