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fa7f9e7f GU |
1 | /* |
2 | * linux/arch/m68k/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> | |
5bc8c7cd | 14 | #include <linux/export.h> |
fa7f9e7f GU |
15 | #include <linux/module.h> |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/param.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/rtc.h> | |
22 | #include <linux/platform_device.h> | |
23 | ||
24 | #include <asm/machdep.h> | |
25 | #include <asm/io.h> | |
26 | #include <asm/irq_regs.h> | |
27 | ||
28 | #include <linux/time.h> | |
29 | #include <linux/timex.h> | |
30 | #include <linux/profile.h> | |
31 | ||
017cecee GU |
32 | |
33 | unsigned long (*mach_random_get_entropy)(void); | |
5bc8c7cd | 34 | EXPORT_SYMBOL_GPL(mach_random_get_entropy); |
017cecee GU |
35 | |
36 | ||
fa7f9e7f GU |
37 | /* |
38 | * timer_interrupt() needs to keep up the real-time clock, | |
39 | * as well as call the "xtime_update()" routine every clocktick | |
40 | */ | |
41 | static irqreturn_t timer_interrupt(int irq, void *dummy) | |
42 | { | |
43 | xtime_update(1); | |
44 | update_process_times(user_mode(get_irq_regs())); | |
45 | profile_tick(CPU_PROFILING); | |
46 | ||
47 | #ifdef CONFIG_HEARTBEAT | |
48 | /* use power LED as a heartbeat instead -- much more useful | |
49 | for debugging -- based on the version for PReP by Cort */ | |
50 | /* acts like an actual heart beat -- ie thump-thump-pause... */ | |
51 | if (mach_heartbeat) { | |
52 | static unsigned cnt = 0, period = 0, dist = 0; | |
53 | ||
54 | if (cnt == 0 || cnt == dist) | |
55 | mach_heartbeat( 1 ); | |
56 | else if (cnt == 7 || cnt == dist+7) | |
57 | mach_heartbeat( 0 ); | |
58 | ||
59 | if (++cnt > period) { | |
60 | cnt = 0; | |
61 | /* The hyperbolic function below modifies the heartbeat period | |
62 | * length in dependency of the current (5min) load. It goes | |
63 | * through the points f(0)=126, f(1)=86, f(5)=51, | |
64 | * f(inf)->30. */ | |
65 | period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; | |
66 | dist = period / 4; | |
67 | } | |
68 | } | |
69 | #endif /* CONFIG_HEARTBEAT */ | |
70 | return IRQ_HANDLED; | |
71 | } | |
72 | ||
73 | void read_persistent_clock(struct timespec *ts) | |
74 | { | |
75 | struct rtc_time time; | |
76 | ts->tv_sec = 0; | |
77 | ts->tv_nsec = 0; | |
78 | ||
79 | if (mach_hwclk) { | |
80 | mach_hwclk(0, &time); | |
81 | ||
82 | if ((time.tm_year += 1900) < 1970) | |
83 | time.tm_year += 100; | |
84 | ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday, | |
85 | time.tm_hour, time.tm_min, time.tm_sec); | |
86 | } | |
87 | } | |
88 | ||
b13b3f51 | 89 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
fa7f9e7f | 90 | |
fa7f9e7f GU |
91 | static int __init rtc_init(void) |
92 | { | |
93 | struct platform_device *pdev; | |
94 | ||
95 | if (!mach_hwclk) | |
96 | return -ENODEV; | |
97 | ||
98 | pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0); | |
8c6ffba0 | 99 | return PTR_ERR_OR_ZERO(pdev); |
fa7f9e7f GU |
100 | } |
101 | ||
102 | module_init(rtc_init); | |
103 | ||
b13b3f51 | 104 | #endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */ |
7b1f6207 SW |
105 | |
106 | void __init time_init(void) | |
107 | { | |
7b1f6207 SW |
108 | mach_sched_init(timer_interrupt); |
109 | } |