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985c0679 MZ |
1 | /* |
2 | * Based on arch/arm/kernel/time.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds | |
5 | * Modifications for ARM (C) 1994-2001 Russell King | |
6 | * Copyright (C) 2012 ARM Ltd. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <linux/export.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/time.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/smp.h> | |
28 | #include <linux/timex.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/profile.h> | |
31 | #include <linux/syscore_ops.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/irq.h> | |
1aee5d7a | 34 | #include <linux/delay.h> |
0583fe47 | 35 | #include <linux/clocksource.h> |
985c0679 | 36 | |
1aee5d7a | 37 | #include <clocksource/arm_arch_timer.h> |
985c0679 MZ |
38 | |
39 | #include <asm/thread_info.h> | |
40 | #include <asm/stacktrace.h> | |
41 | ||
42 | #ifdef CONFIG_SMP | |
43 | unsigned long profile_pc(struct pt_regs *regs) | |
44 | { | |
45 | struct stackframe frame; | |
46 | ||
47 | if (!in_lock_functions(regs->pc)) | |
48 | return regs->pc; | |
49 | ||
50 | frame.fp = regs->regs[29]; | |
51 | frame.sp = regs->sp; | |
52 | frame.pc = regs->pc; | |
53 | do { | |
54 | int ret = unwind_frame(&frame); | |
55 | if (ret < 0) | |
56 | return 0; | |
57 | } while (in_lock_functions(frame.pc)); | |
58 | ||
59 | return frame.pc; | |
60 | } | |
61 | EXPORT_SYMBOL(profile_pc); | |
62 | #endif | |
63 | ||
64 | void __init time_init(void) | |
65 | { | |
1aee5d7a MR |
66 | u32 arch_timer_rate; |
67 | ||
0583fe47 | 68 | clocksource_of_init(); |
1aee5d7a MR |
69 | |
70 | arch_timer_rate = arch_timer_get_rate(); | |
0583fe47 RH |
71 | if (!arch_timer_rate) |
72 | panic("Unable to initialise architected timer.\n"); | |
1aee5d7a | 73 | |
1aee5d7a MR |
74 | /* Calibrate the delay loop directly */ |
75 | lpj_fine = arch_timer_rate / HZ; | |
985c0679 | 76 | } |