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