1 | // SPDX-License-Identifier: GPL-2.0-only |
---|---|
2 | /* |
3 | * Based on arch/arm/kernel/time.c |
4 | * |
5 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds |
6 | * Modifications for ARM (C) 1994-2001 Russell King |
7 | * Copyright (C) 2012 ARM Ltd. |
8 | */ |
9 | |
10 | #include <linux/clockchips.h> |
11 | #include <linux/export.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/interrupt.h> |
14 | #include <linux/time.h> |
15 | #include <linux/init.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/smp.h> |
18 | #include <linux/timex.h> |
19 | #include <linux/errno.h> |
20 | #include <linux/profile.h> |
21 | #include <linux/stacktrace.h> |
22 | #include <linux/syscore_ops.h> |
23 | #include <linux/timer.h> |
24 | #include <linux/irq.h> |
25 | #include <linux/delay.h> |
26 | #include <linux/clocksource.h> |
27 | #include <linux/of_clk.h> |
28 | #include <linux/acpi.h> |
29 | |
30 | #include <clocksource/arm_arch_timer.h> |
31 | |
32 | #include <asm/thread_info.h> |
33 | #include <asm/paravirt.h> |
34 | |
35 | static bool profile_pc_cb(void *arg, unsigned long pc) |
36 | { |
37 | unsigned long *prof_pc = arg; |
38 | |
39 | if (in_lock_functions(addr: pc)) |
40 | return true; |
41 | *prof_pc = pc; |
42 | return false; |
43 | } |
44 | |
45 | unsigned long profile_pc(struct pt_regs *regs) |
46 | { |
47 | unsigned long prof_pc = 0; |
48 | |
49 | arch_stack_walk(consume_entry: profile_pc_cb, cookie: &prof_pc, current, regs); |
50 | |
51 | return prof_pc; |
52 | } |
53 | EXPORT_SYMBOL(profile_pc); |
54 | |
55 | void __init time_init(void) |
56 | { |
57 | u32 arch_timer_rate; |
58 | |
59 | of_clk_init(NULL); |
60 | timer_probe(); |
61 | |
62 | tick_setup_hrtimer_broadcast(); |
63 | |
64 | arch_timer_rate = arch_timer_get_rate(); |
65 | if (!arch_timer_rate) |
66 | panic(fmt: "Unable to initialise architected timer.\n"); |
67 | |
68 | /* Calibrate the delay loop directly */ |
69 | lpj_fine = arch_timer_rate / HZ; |
70 | |
71 | pv_time_init(); |
72 | } |
73 |