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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/arch/arm/kernel/time.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds | |
6 | * Modifications for ARM (C) 1994-2001 Russell King | |
7 | * | |
1da177e4 LT |
8 | * This file contains the ARM-specific time handling details: |
9 | * reading the RTC at bootup, etc... | |
1da177e4 | 10 | */ |
022eb8ae | 11 | #include <linux/clockchips.h> |
4178bac4 SH |
12 | #include <linux/clocksource.h> |
13 | #include <linux/errno.h> | |
ecea4ab6 | 14 | #include <linux/export.h> |
1da177e4 | 15 | #include <linux/init.h> |
4178bac4 SH |
16 | #include <linux/interrupt.h> |
17 | #include <linux/irq.h> | |
18 | #include <linux/kernel.h> | |
9bffcf42 | 19 | #include <linux/of_clk.h> |
4178bac4 | 20 | #include <linux/profile.h> |
d43c36dc | 21 | #include <linux/sched.h> |
4178bac4 | 22 | #include <linux/sched_clock.h> |
1da177e4 | 23 | #include <linux/smp.h> |
4178bac4 | 24 | #include <linux/time.h> |
1da177e4 | 25 | #include <linux/timex.h> |
1da177e4 LT |
26 | #include <linux/timer.h> |
27 | ||
8ff1443c | 28 | #include <asm/mach/arch.h> |
1da177e4 | 29 | #include <asm/mach/time.h> |
4178bac4 SH |
30 | #include <asm/stacktrace.h> |
31 | #include <asm/thread_info.h> | |
1da177e4 | 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 | |
a3250c92 | 51 | arm_get_current_stackframe(regs, &frame); |
2d7c11bf CM |
52 | do { |
53 | int ret = unwind_frame(&frame); | |
54 | if (ret < 0) | |
55 | return 0; | |
56 | } while (in_lock_functions(frame.pc)); | |
57 | ||
58 | return frame.pc; | |
1da177e4 LT |
59 | } |
60 | EXPORT_SYMBOL(profile_pc); | |
61 | #endif | |
62 | ||
cb850717 | 63 | static void dummy_clock_access(struct timespec64 *ts) |
bd0493ea MZ |
64 | { |
65 | ts->tv_sec = 0; | |
66 | ts->tv_nsec = 0; | |
67 | } | |
68 | ||
69 | static clock_access_fn __read_persistent_clock = dummy_clock_access; | |
bd0493ea | 70 | |
cb850717 | 71 | void read_persistent_clock64(struct timespec64 *ts) |
bd0493ea MZ |
72 | { |
73 | __read_persistent_clock(ts); | |
74 | } | |
75 | ||
227e3958 | 76 | int __init register_persistent_clock(clock_access_fn read_persistent) |
bd0493ea MZ |
77 | { |
78 | /* Only allow the clockaccess functions to be registered once */ | |
227e3958 | 79 | if (__read_persistent_clock == dummy_clock_access) { |
bd0493ea MZ |
80 | if (read_persistent) |
81 | __read_persistent_clock = read_persistent; | |
bd0493ea MZ |
82 | return 0; |
83 | } | |
84 | ||
85 | return -EINVAL; | |
86 | } | |
87 | ||
1da177e4 LT |
88 | void __init time_init(void) |
89 | { | |
4178bac4 | 90 | if (machine_desc->init_time) { |
f414f13f | 91 | machine_desc->init_time(); |
4178bac4 SH |
92 | } else { |
93 | #ifdef CONFIG_COMMON_CLK | |
94 | of_clk_init(NULL); | |
95 | #endif | |
ba5d08c0 | 96 | timer_probe(); |
022eb8ae | 97 | tick_setup_hrtimer_broadcast(); |
4178bac4 | 98 | } |
1da177e4 | 99 | } |