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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 
set_rtc_mmss(unsigned long nowtime)29 static inline int set_rtc_mmss(unsigned long nowtime)
30 {
31 	if (mach_set_clock_mmss)
32 		return mach_set_clock_mmss (nowtime);
33 	return -1;
34 }
35 
36 #ifndef CONFIG_GENERIC_CLOCKEVENTS
37 /*
38  * timer_interrupt() needs to keep up the real-time clock,
39  * as well as call the "do_timer()" routine every clocktick
40  */
arch_timer_interrupt(int irq,void * dummy)41 irqreturn_t arch_timer_interrupt(int irq, void *dummy)
42 {
43 
44 	if (current->pid)
45 		profile_tick(CPU_PROFILING);
46 
47 	write_seqlock(&xtime_lock);
48 
49 	do_timer(1);
50 
51 	write_sequnlock(&xtime_lock);
52 
53 #ifndef CONFIG_SMP
54 	update_process_times(user_mode(get_irq_regs()));
55 #endif
56 	return(IRQ_HANDLED);
57 }
58 #endif
59 
read_rtc_mmss(void)60 static unsigned long read_rtc_mmss(void)
61 {
62 	unsigned int year, mon, day, hour, min, sec;
63 
64 	if (mach_gettod)
65 		mach_gettod(&year, &mon, &day, &hour, &min, &sec);
66 	else
67 		year = mon = day = hour = min = sec = 0;
68 
69 	if ((year += 1900) < 1970)
70 		year += 100;
71 
72 	return  mktime(year, mon, day, hour, min, sec);;
73 }
74 
read_persistent_clock(void)75 unsigned long read_persistent_clock(void)
76 {
77 	return read_rtc_mmss();
78 }
79 
update_persistent_clock(struct timespec now)80 int update_persistent_clock(struct timespec now)
81 {
82 	return set_rtc_mmss(now.tv_sec);
83 }
84 
time_init(void)85 void time_init(void)
86 {
87 	hw_timer_init();
88 }
89