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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 | */ |
4178bac4 SH |
14 | #include <linux/clk-provider.h> |
15 | #include <linux/clocksource.h> | |
16 | #include <linux/errno.h> | |
ecea4ab6 | 17 | #include <linux/export.h> |
1da177e4 | 18 | #include <linux/init.h> |
4178bac4 SH |
19 | #include <linux/interrupt.h> |
20 | #include <linux/irq.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/profile.h> | |
d43c36dc | 23 | #include <linux/sched.h> |
4178bac4 | 24 | #include <linux/sched_clock.h> |
1da177e4 | 25 | #include <linux/smp.h> |
4178bac4 | 26 | #include <linux/time.h> |
1da177e4 | 27 | #include <linux/timex.h> |
1da177e4 LT |
28 | #include <linux/timer.h> |
29 | ||
8ff1443c | 30 | #include <asm/mach/arch.h> |
1da177e4 | 31 | #include <asm/mach/time.h> |
4178bac4 SH |
32 | #include <asm/stacktrace.h> |
33 | #include <asm/thread_info.h> | |
1da177e4 | 34 | |
63216d3c AB |
35 | #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || \ |
36 | defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) | |
1da177e4 LT |
37 | /* this needs a better home */ |
38 | DEFINE_SPINLOCK(rtc_lock); | |
1da177e4 | 39 | EXPORT_SYMBOL(rtc_lock); |
9dd34948 | 40 | #endif /* pc-style 'CMOS' RTC support */ |
1da177e4 LT |
41 | |
42 | /* change this if you have some constant time drift */ | |
43 | #define USECS_PER_JIFFY (1000000/HZ) | |
44 | ||
45 | #ifdef CONFIG_SMP | |
46 | unsigned long profile_pc(struct pt_regs *regs) | |
47 | { | |
2d7c11bf | 48 | struct stackframe frame; |
1da177e4 | 49 | |
2d7c11bf CM |
50 | if (!in_lock_functions(regs->ARM_pc)) |
51 | return regs->ARM_pc; | |
1da177e4 | 52 | |
a3250c92 | 53 | arm_get_current_stackframe(regs, &frame); |
2d7c11bf CM |
54 | do { |
55 | int ret = unwind_frame(&frame); | |
56 | if (ret < 0) | |
57 | return 0; | |
58 | } while (in_lock_functions(frame.pc)); | |
59 | ||
60 | return frame.pc; | |
1da177e4 LT |
61 | } |
62 | EXPORT_SYMBOL(profile_pc); | |
63 | #endif | |
64 | ||
9e4559dd | 65 | #ifndef CONFIG_GENERIC_CLOCKEVENTS |
1da177e4 LT |
66 | /* |
67 | * Kernel system timer support. | |
68 | */ | |
0cd61b68 | 69 | void timer_tick(void) |
1da177e4 | 70 | { |
e317c8cc | 71 | profile_tick(CPU_PROFILING); |
6906e33c | 72 | xtime_update(1); |
1da177e4 | 73 | #ifndef CONFIG_SMP |
c97d4869 | 74 | update_process_times(user_mode(get_irq_regs())); |
1da177e4 LT |
75 | #endif |
76 | } | |
9e4559dd | 77 | #endif |
1da177e4 | 78 | |
cb850717 | 79 | static void dummy_clock_access(struct timespec64 *ts) |
bd0493ea MZ |
80 | { |
81 | ts->tv_sec = 0; | |
82 | ts->tv_nsec = 0; | |
83 | } | |
84 | ||
85 | static clock_access_fn __read_persistent_clock = dummy_clock_access; | |
86 | static clock_access_fn __read_boot_clock = dummy_clock_access;; | |
87 | ||
cb850717 | 88 | void read_persistent_clock64(struct timespec64 *ts) |
bd0493ea MZ |
89 | { |
90 | __read_persistent_clock(ts); | |
91 | } | |
92 | ||
cb850717 | 93 | void read_boot_clock64(struct timespec64 *ts) |
bd0493ea MZ |
94 | { |
95 | __read_boot_clock(ts); | |
96 | } | |
97 | ||
98 | int __init register_persistent_clock(clock_access_fn read_boot, | |
99 | clock_access_fn read_persistent) | |
100 | { | |
101 | /* Only allow the clockaccess functions to be registered once */ | |
102 | if (__read_persistent_clock == dummy_clock_access && | |
103 | __read_boot_clock == dummy_clock_access) { | |
104 | if (read_boot) | |
105 | __read_boot_clock = read_boot; | |
106 | if (read_persistent) | |
107 | __read_persistent_clock = read_persistent; | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | return -EINVAL; | |
113 | } | |
114 | ||
1da177e4 LT |
115 | void __init time_init(void) |
116 | { | |
4178bac4 | 117 | if (machine_desc->init_time) { |
f414f13f | 118 | machine_desc->init_time(); |
4178bac4 SH |
119 | } else { |
120 | #ifdef CONFIG_COMMON_CLK | |
121 | of_clk_init(NULL); | |
122 | #endif | |
f414f13f | 123 | clocksource_of_init(); |
4178bac4 | 124 | } |
1da177e4 | 125 | } |