1 /*
2 * linux/arch/m68knommu/kernel/time.c
3 *
4 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
5 *
6 * This file contains the m68k-specific time handling details.
7 * Most of the stuff is located in the machine specific files.
8 *
9 * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
10 * "A Kernel Model for Precision Timekeeping" by Dave Mills
11 */
12
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>
19 #include <linux/mm.h>
20 #include <linux/profile.h>
21 #include <linux/time.h>
22 #include <linux/timex.h>
23
24 #include <asm/machdep.h>
25 #include <asm/irq_regs.h>
26
27 #define TICK_SIZE (tick_nsec / 1000)
28
29 /* machine dependent timer functions */
30 void (*mach_gettod)(int*, int*, int*, int*, int*, int*);
31
set_rtc_mmss(unsigned long nowtime)32 static inline int set_rtc_mmss(unsigned long nowtime)
33 {
34 if (mach_set_clock_mmss)
35 return mach_set_clock_mmss (nowtime);
36 return -1;
37 }
38
39 #ifndef CONFIG_GENERIC_CLOCKEVENTS
40 /*
41 * timer_interrupt() needs to keep up the real-time clock,
42 * as well as call the "xtime_update()" routine every clocktick
43 */
arch_timer_interrupt(int irq,void * dummy)44 irqreturn_t arch_timer_interrupt(int irq, void *dummy)
45 {
46
47 if (current->pid)
48 profile_tick(CPU_PROFILING);
49
50 xtime_update(1);
51
52 update_process_times(user_mode(get_irq_regs()));
53
54 return(IRQ_HANDLED);
55 }
56 #endif
57
read_rtc_mmss(void)58 static unsigned long read_rtc_mmss(void)
59 {
60 unsigned int year, mon, day, hour, min, sec;
61
62 if (mach_gettod) {
63 mach_gettod(&year, &mon, &day, &hour, &min, &sec);
64 if ((year += 1900) < 1970)
65 year += 100;
66 } else {
67 year = 1970;
68 mon = day = 1;
69 hour = min = sec = 0;
70 }
71
72
73 return mktime(year, mon, day, hour, min, sec);
74 }
75
read_persistent_clock(struct timespec * ts)76 void read_persistent_clock(struct timespec *ts)
77 {
78 ts->tv_sec = read_rtc_mmss();
79 ts->tv_nsec = 0;
80 }
81
update_persistent_clock(struct timespec now)82 int update_persistent_clock(struct timespec now)
83 {
84 return set_rtc_mmss(now.tv_sec);
85 }
86
time_init(void)87 void time_init(void)
88 {
89 hw_timer_init();
90 }
91