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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/clockchips.h>
22 #include <linux/export.h>
23 #include <linux/kernel.h>
24 #include <linux/interrupt.h>
25 #include <linux/time.h>
26 #include <linux/init.h>
27 #include <linux/sched.h>
28 #include <linux/smp.h>
29 #include <linux/timex.h>
30 #include <linux/errno.h>
31 #include <linux/profile.h>
32 #include <linux/syscore_ops.h>
33 #include <linux/timer.h>
34 #include <linux/irq.h>
35 #include <linux/delay.h>
36 #include <linux/clocksource.h>
37 #include <linux/clk-provider.h>
38 
39 #include <clocksource/arm_arch_timer.h>
40 
41 #include <asm/thread_info.h>
42 #include <asm/stacktrace.h>
43 
profile_pc(struct pt_regs * regs)44 unsigned long profile_pc(struct pt_regs *regs)
45 {
46 	struct stackframe frame;
47 
48 	if (!in_lock_functions(regs->pc))
49 		return regs->pc;
50 
51 	frame.fp = regs->regs[29];
52 	frame.sp = regs->sp;
53 	frame.pc = regs->pc;
54 	do {
55 		int ret = unwind_frame(&frame);
56 		if (ret < 0)
57 			return 0;
58 	} while (in_lock_functions(frame.pc));
59 
60 	return frame.pc;
61 }
62 EXPORT_SYMBOL(profile_pc);
63 
time_init(void)64 void __init time_init(void)
65 {
66 	u32 arch_timer_rate;
67 
68 	of_clk_init(NULL);
69 	clocksource_of_init();
70 
71 	tick_setup_hrtimer_broadcast();
72 
73 	arch_timer_rate = arch_timer_get_rate();
74 	if (!arch_timer_rate)
75 		panic("Unable to initialise architected timer.\n");
76 
77 	/* Calibrate the delay loop directly */
78 	lpj_fine = arch_timer_rate / HZ;
79 }
80