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(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(profile_pc_cb, &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("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
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