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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> | |
1da177e4 | 24 | #include <linux/timer.h> |
e317c8cc | 25 | #include <linux/irq.h> |
1da177e4 | 26 | |
1da177e4 | 27 | #include <asm/thread_info.h> |
211baa70 | 28 | #include <asm/sched_clock.h> |
2d7c11bf | 29 | #include <asm/stacktrace.h> |
8ff1443c | 30 | #include <asm/mach/arch.h> |
1da177e4 LT |
31 | #include <asm/mach/time.h> |
32 | ||
63216d3c AB |
33 | #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || \ |
34 | defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) | |
1da177e4 LT |
35 | /* this needs a better home */ |
36 | DEFINE_SPINLOCK(rtc_lock); | |
1da177e4 | 37 | EXPORT_SYMBOL(rtc_lock); |
9dd34948 | 38 | #endif /* pc-style 'CMOS' RTC support */ |
1da177e4 LT |
39 | |
40 | /* change this if you have some constant time drift */ | |
41 | #define USECS_PER_JIFFY (1000000/HZ) | |
42 | ||
43 | #ifdef CONFIG_SMP | |
44 | unsigned long profile_pc(struct pt_regs *regs) | |
45 | { | |
2d7c11bf | 46 | struct stackframe frame; |
1da177e4 | 47 | |
2d7c11bf CM |
48 | if (!in_lock_functions(regs->ARM_pc)) |
49 | return regs->ARM_pc; | |
1da177e4 | 50 | |
2d7c11bf CM |
51 | frame.fp = regs->ARM_fp; |
52 | frame.sp = regs->ARM_sp; | |
53 | frame.lr = regs->ARM_lr; | |
54 | frame.pc = regs->ARM_pc; | |
55 | do { | |
56 | int ret = unwind_frame(&frame); | |
57 | if (ret < 0) | |
58 | return 0; | |
59 | } while (in_lock_functions(frame.pc)); | |
60 | ||
61 | return frame.pc; | |
1da177e4 LT |
62 | } |
63 | EXPORT_SYMBOL(profile_pc); | |
64 | #endif | |
65 | ||
9e4559dd | 66 | #ifndef CONFIG_GENERIC_CLOCKEVENTS |
1da177e4 LT |
67 | /* |
68 | * Kernel system timer support. | |
69 | */ | |
0cd61b68 | 70 | void timer_tick(void) |
1da177e4 | 71 | { |
e317c8cc | 72 | profile_tick(CPU_PROFILING); |
6906e33c | 73 | xtime_update(1); |
1da177e4 | 74 | #ifndef CONFIG_SMP |
c97d4869 | 75 | update_process_times(user_mode(get_irq_regs())); |
1da177e4 LT |
76 | #endif |
77 | } | |
9e4559dd | 78 | #endif |
1da177e4 | 79 | |
bd0493ea MZ |
80 | static void dummy_clock_access(struct timespec *ts) |
81 | { | |
82 | ts->tv_sec = 0; | |
83 | ts->tv_nsec = 0; | |
84 | } | |
85 | ||
86 | static clock_access_fn __read_persistent_clock = dummy_clock_access; | |
87 | static clock_access_fn __read_boot_clock = dummy_clock_access;; | |
88 | ||
89 | void read_persistent_clock(struct timespec *ts) | |
90 | { | |
91 | __read_persistent_clock(ts); | |
92 | } | |
93 | ||
94 | void read_boot_clock(struct timespec *ts) | |
95 | { | |
96 | __read_boot_clock(ts); | |
97 | } | |
98 | ||
99 | int __init register_persistent_clock(clock_access_fn read_boot, | |
100 | clock_access_fn read_persistent) | |
101 | { | |
102 | /* Only allow the clockaccess functions to be registered once */ | |
103 | if (__read_persistent_clock == dummy_clock_access && | |
104 | __read_boot_clock == dummy_clock_access) { | |
105 | if (read_boot) | |
106 | __read_boot_clock = read_boot; | |
107 | if (read_persistent) | |
108 | __read_persistent_clock = read_persistent; | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | return -EINVAL; | |
114 | } | |
115 | ||
1da177e4 LT |
116 | void __init time_init(void) |
117 | { | |
6bb27d73 | 118 | machine_desc->init_time(); |
211baa70 | 119 | sched_clock_postinit(); |
1da177e4 | 120 | } |