1 // SPDX-License-Identifier: GPL-2.0-only
3 * Based on arch/arm/kernel/time.c
5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 * Modifications for ARM (C) 1994-2001 Russell King
7 * Copyright (C) 2012 ARM Ltd.
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/syscore_ops.h>
22 #include <linux/timer.h>
23 #include <linux/irq.h>
24 #include <linux/delay.h>
25 #include <linux/clocksource.h>
26 #include <linux/clk-provider.h>
27 #include <linux/acpi.h>
29 #include <clocksource/arm_arch_timer.h>
31 #include <asm/thread_info.h>
32 #include <asm/stacktrace.h>
34 unsigned long profile_pc(struct pt_regs *regs)
36 struct stackframe frame;
38 if (!in_lock_functions(regs->pc))
41 start_backtrace(&frame, regs->regs[29], regs->pc);
44 int ret = unwind_frame(NULL, &frame);
47 } while (in_lock_functions(frame.pc));
51 EXPORT_SYMBOL(profile_pc);
53 void __init time_init(void)
60 tick_setup_hrtimer_broadcast();
62 arch_timer_rate = arch_timer_get_rate();
64 panic("Unable to initialise architected timer.\n");
66 /* Calibrate the delay loop directly */
67 lpj_fine = arch_timer_rate / HZ;