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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 | */ |
ecea4ab6 | 14 | #include <linux/export.h> |
1da177e4 LT |
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> | |
328f5cc3 | 24 | #include <linux/syscore_ops.h> |
1da177e4 | 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 | |
63216d3c AB |
42 | #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || \ |
43 | defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) | |
1da177e4 LT |
44 | /* this needs a better home */ |
45 | DEFINE_SPINLOCK(rtc_lock); | |
1da177e4 | 46 | EXPORT_SYMBOL(rtc_lock); |
9dd34948 | 47 | #endif /* pc-style 'CMOS' RTC support */ |
1da177e4 LT |
48 | |
49 | /* change this if you have some constant time drift */ | |
50 | #define USECS_PER_JIFFY (1000000/HZ) | |
51 | ||
52 | #ifdef CONFIG_SMP | |
53 | unsigned long profile_pc(struct pt_regs *regs) | |
54 | { | |
2d7c11bf | 55 | struct stackframe frame; |
1da177e4 | 56 | |
2d7c11bf CM |
57 | if (!in_lock_functions(regs->ARM_pc)) |
58 | return regs->ARM_pc; | |
1da177e4 | 59 | |
2d7c11bf CM |
60 | frame.fp = regs->ARM_fp; |
61 | frame.sp = regs->ARM_sp; | |
62 | frame.lr = regs->ARM_lr; | |
63 | frame.pc = regs->ARM_pc; | |
64 | do { | |
65 | int ret = unwind_frame(&frame); | |
66 | if (ret < 0) | |
67 | return 0; | |
68 | } while (in_lock_functions(frame.pc)); | |
69 | ||
70 | return frame.pc; | |
1da177e4 LT |
71 | } |
72 | EXPORT_SYMBOL(profile_pc); | |
73 | #endif | |
74 | ||
5cfc8ee0 JS |
75 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
76 | u32 arch_gettimeoffset(void) | |
1da177e4 | 77 | { |
5cfc8ee0 JS |
78 | if (system_timer->offset != NULL) |
79 | return system_timer->offset() * 1000; | |
80 | ||
1da177e4 LT |
81 | return 0; |
82 | } | |
5cfc8ee0 | 83 | #endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */ |
1da177e4 | 84 | |
1da177e4 LT |
85 | #ifdef CONFIG_LEDS_TIMER |
86 | static inline void do_leds(void) | |
87 | { | |
6d15cb42 | 88 | static unsigned int count = HZ/2; |
1da177e4 LT |
89 | |
90 | if (--count == 0) { | |
6d15cb42 | 91 | count = HZ/2; |
1da177e4 LT |
92 | leds_event(led_timer); |
93 | } | |
94 | } | |
95 | #else | |
96 | #define do_leds() | |
97 | #endif | |
98 | ||
1da177e4 | 99 | |
9e4559dd | 100 | #ifndef CONFIG_GENERIC_CLOCKEVENTS |
1da177e4 LT |
101 | /* |
102 | * Kernel system timer support. | |
103 | */ | |
0cd61b68 | 104 | void timer_tick(void) |
1da177e4 | 105 | { |
e317c8cc | 106 | profile_tick(CPU_PROFILING); |
1da177e4 | 107 | do_leds(); |
6906e33c | 108 | xtime_update(1); |
1da177e4 | 109 | #ifndef CONFIG_SMP |
c97d4869 | 110 | update_process_times(user_mode(get_irq_regs())); |
1da177e4 LT |
111 | #endif |
112 | } | |
9e4559dd | 113 | #endif |
1da177e4 | 114 | |
9e4559dd | 115 | #if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS) |
328f5cc3 | 116 | static int timer_suspend(void) |
1da177e4 | 117 | { |
328f5cc3 RW |
118 | if (system_timer->suspend) |
119 | system_timer->suspend(); | |
1da177e4 LT |
120 | |
121 | return 0; | |
122 | } | |
123 | ||
328f5cc3 | 124 | static void timer_resume(void) |
1da177e4 | 125 | { |
328f5cc3 RW |
126 | if (system_timer->resume) |
127 | system_timer->resume(); | |
1da177e4 LT |
128 | } |
129 | #else | |
130 | #define timer_suspend NULL | |
131 | #define timer_resume NULL | |
132 | #endif | |
133 | ||
328f5cc3 | 134 | static struct syscore_ops timer_syscore_ops = { |
1da177e4 LT |
135 | .suspend = timer_suspend, |
136 | .resume = timer_resume, | |
137 | }; | |
138 | ||
328f5cc3 | 139 | static int __init timer_init_syscore_ops(void) |
1da177e4 | 140 | { |
328f5cc3 | 141 | register_syscore_ops(&timer_syscore_ops); |
8749af68 | 142 | |
328f5cc3 | 143 | return 0; |
1da177e4 LT |
144 | } |
145 | ||
328f5cc3 | 146 | device_initcall(timer_init_syscore_ops); |
1da177e4 LT |
147 | |
148 | void __init time_init(void) | |
149 | { | |
8ff1443c | 150 | system_timer = machine_desc->timer; |
1da177e4 | 151 | system_timer->init(); |
211baa70 RK |
152 | #ifdef CONFIG_HAVE_SCHED_CLOCK |
153 | sched_clock_postinit(); | |
154 | #endif | |
1da177e4 LT |
155 | } |
156 |