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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
985c0679 MZ |
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. | |
985c0679 MZ |
8 | */ |
9 | ||
9358d755 | 10 | #include <linux/clockchips.h> |
985c0679 MZ |
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> | |
1aee5d7a | 24 | #include <linux/delay.h> |
0583fe47 | 25 | #include <linux/clocksource.h> |
bc3ee18a | 26 | #include <linux/clk-provider.h> |
b09ca1ec | 27 | #include <linux/acpi.h> |
985c0679 | 28 | |
1aee5d7a | 29 | #include <clocksource/arm_arch_timer.h> |
985c0679 MZ |
30 | |
31 | #include <asm/thread_info.h> | |
32 | #include <asm/stacktrace.h> | |
33 | ||
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34 | unsigned long profile_pc(struct pt_regs *regs) |
35 | { | |
36 | struct stackframe frame; | |
37 | ||
38 | if (!in_lock_functions(regs->pc)) | |
39 | return regs->pc; | |
40 | ||
f3dcbe67 DM |
41 | start_backtrace(&frame, regs->regs[29], regs->pc); |
42 | ||
985c0679 | 43 | do { |
fe13f95b | 44 | int ret = unwind_frame(NULL, &frame); |
985c0679 MZ |
45 | if (ret < 0) |
46 | return 0; | |
47 | } while (in_lock_functions(frame.pc)); | |
48 | ||
49 | return frame.pc; | |
50 | } | |
51 | EXPORT_SYMBOL(profile_pc); | |
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52 | |
53 | void __init time_init(void) | |
54 | { | |
1aee5d7a MR |
55 | u32 arch_timer_rate; |
56 | ||
bc3ee18a | 57 | of_clk_init(NULL); |
ba5d08c0 | 58 | timer_probe(); |
1aee5d7a | 59 | |
9358d755 LP |
60 | tick_setup_hrtimer_broadcast(); |
61 | ||
1aee5d7a | 62 | arch_timer_rate = arch_timer_get_rate(); |
0583fe47 RH |
63 | if (!arch_timer_rate) |
64 | panic("Unable to initialise architected timer.\n"); | |
1aee5d7a | 65 | |
1aee5d7a MR |
66 | /* Calibrate the delay loop directly */ |
67 | lpj_fine = arch_timer_rate / HZ; | |
985c0679 | 68 | } |