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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/time.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds | |
5 | * Modifications for ARM (C) 1994-2001 Russell King | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This file contains the ARM-specific time handling details: | |
12 | * reading the RTC at bootup, etc... | |
1da177e4 | 13 | */ |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/time.h> | |
18 | #include <linux/init.h> | |
d43c36dc | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include <linux/smp.h> |
21 | #include <linux/timex.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/profile.h> | |
24 | #include <linux/sysdev.h> | |
25 | #include <linux/timer.h> | |
e317c8cc | 26 | #include <linux/irq.h> |
1da177e4 | 27 | |
9ca3f07b BD |
28 | #include <linux/mc146818rtc.h> |
29 | ||
1da177e4 LT |
30 | #include <asm/leds.h> |
31 | #include <asm/thread_info.h> | |
211baa70 | 32 | #include <asm/sched_clock.h> |
2d7c11bf | 33 | #include <asm/stacktrace.h> |
8ff1443c | 34 | #include <asm/mach/arch.h> |
1da177e4 LT |
35 | #include <asm/mach/time.h> |
36 | ||
1da177e4 LT |
37 | /* |
38 | * Our system timer. | |
39 | */ | |
8ff1443c | 40 | static struct sys_timer *system_timer; |
1da177e4 | 41 | |
9dd34948 | 42 | #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) |
1da177e4 LT |
43 | /* this needs a better home */ |
44 | DEFINE_SPINLOCK(rtc_lock); | |
45 | ||
9dd34948 | 46 | #ifdef CONFIG_RTC_DRV_CMOS_MODULE |
1da177e4 LT |
47 | EXPORT_SYMBOL(rtc_lock); |
48 | #endif | |
9dd34948 | 49 | #endif /* pc-style 'CMOS' RTC support */ |
1da177e4 LT |
50 | |
51 | /* change this if you have some constant time drift */ | |
52 | #define USECS_PER_JIFFY (1000000/HZ) | |
53 | ||
54 | #ifdef CONFIG_SMP | |
55 | unsigned long profile_pc(struct pt_regs *regs) | |
56 | { | |
2d7c11bf | 57 | struct stackframe frame; |
1da177e4 | 58 | |
2d7c11bf CM |
59 | if (!in_lock_functions(regs->ARM_pc)) |
60 | return regs->ARM_pc; | |
1da177e4 | 61 | |
2d7c11bf CM |
62 | frame.fp = regs->ARM_fp; |
63 | frame.sp = regs->ARM_sp; | |
64 | frame.lr = regs->ARM_lr; | |
65 | frame.pc = regs->ARM_pc; | |
66 | do { | |
67 | int ret = unwind_frame(&frame); | |
68 | if (ret < 0) | |
69 | return 0; | |
70 | } while (in_lock_functions(frame.pc)); | |
71 | ||
72 | return frame.pc; | |
1da177e4 LT |
73 | } |
74 | EXPORT_SYMBOL(profile_pc); | |
75 | #endif | |
76 | ||
5cfc8ee0 JS |
77 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
78 | u32 arch_gettimeoffset(void) | |
1da177e4 | 79 | { |
5cfc8ee0 JS |
80 | if (system_timer->offset != NULL) |
81 | return system_timer->offset() * 1000; | |
82 | ||
1da177e4 LT |
83 | return 0; |
84 | } | |
5cfc8ee0 | 85 | #endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */ |
1da177e4 | 86 | |
1da177e4 LT |
87 | #ifdef CONFIG_LEDS_TIMER |
88 | static inline void do_leds(void) | |
89 | { | |
6d15cb42 | 90 | static unsigned int count = HZ/2; |
1da177e4 LT |
91 | |
92 | if (--count == 0) { | |
6d15cb42 | 93 | count = HZ/2; |
1da177e4 LT |
94 | leds_event(led_timer); |
95 | } | |
96 | } | |
97 | #else | |
98 | #define do_leds() | |
99 | #endif | |
100 | ||
1da177e4 | 101 | |
9e4559dd | 102 | #ifndef CONFIG_GENERIC_CLOCKEVENTS |
1da177e4 LT |
103 | /* |
104 | * Kernel system timer support. | |
105 | */ | |
0cd61b68 | 106 | void timer_tick(void) |
1da177e4 | 107 | { |
e317c8cc | 108 | profile_tick(CPU_PROFILING); |
1da177e4 | 109 | do_leds(); |
193c3cc1 | 110 | write_seqlock(&xtime_lock); |
3171a030 | 111 | do_timer(1); |
193c3cc1 | 112 | write_sequnlock(&xtime_lock); |
1da177e4 | 113 | #ifndef CONFIG_SMP |
c97d4869 | 114 | update_process_times(user_mode(get_irq_regs())); |
1da177e4 LT |
115 | #endif |
116 | } | |
9e4559dd | 117 | #endif |
1da177e4 | 118 | |
9e4559dd | 119 | #if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS) |
1da177e4 LT |
120 | static int timer_suspend(struct sys_device *dev, pm_message_t state) |
121 | { | |
122 | struct sys_timer *timer = container_of(dev, struct sys_timer, dev); | |
123 | ||
124 | if (timer->suspend != NULL) | |
125 | timer->suspend(); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int timer_resume(struct sys_device *dev) | |
131 | { | |
132 | struct sys_timer *timer = container_of(dev, struct sys_timer, dev); | |
133 | ||
134 | if (timer->resume != NULL) | |
135 | timer->resume(); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | #else | |
140 | #define timer_suspend NULL | |
141 | #define timer_resume NULL | |
142 | #endif | |
143 | ||
144 | static struct sysdev_class timer_sysclass = { | |
af5ca3f4 | 145 | .name = "timer", |
1da177e4 LT |
146 | .suspend = timer_suspend, |
147 | .resume = timer_resume, | |
148 | }; | |
149 | ||
150 | static int __init timer_init_sysfs(void) | |
151 | { | |
152 | int ret = sysdev_class_register(&timer_sysclass); | |
153 | if (ret == 0) { | |
154 | system_timer->dev.cls = &timer_sysclass; | |
155 | ret = sysdev_register(&system_timer->dev); | |
156 | } | |
8749af68 | 157 | |
1da177e4 LT |
158 | return ret; |
159 | } | |
160 | ||
161 | device_initcall(timer_init_sysfs); | |
162 | ||
163 | void __init time_init(void) | |
164 | { | |
8ff1443c | 165 | system_timer = machine_desc->timer; |
1da177e4 | 166 | system_timer->init(); |
211baa70 RK |
167 | #ifdef CONFIG_HAVE_SCHED_CLOCK |
168 | sched_clock_postinit(); | |
169 | #endif | |
1da177e4 LT |
170 | } |
171 |