GNU Linux-libre 4.19.264-gnu1
[releases.git] / arch / arm / kernel / arch_timer.c
1 /*
2  *  linux/arch/arm/kernel/arch_timer.c
3  *
4  *  Copyright (C) 2011 ARM Ltd.
5  *  All Rights Reserved
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 #include <linux/init.h>
12 #include <linux/types.h>
13 #include <linux/errno.h>
14
15 #include <asm/delay.h>
16
17 #include <clocksource/arm_arch_timer.h>
18
19 static unsigned long arch_timer_read_counter_long(void)
20 {
21         return arch_timer_read_counter();
22 }
23
24 static struct delay_timer arch_delay_timer;
25
26 static void __init arch_timer_delay_timer_register(void)
27 {
28         /* Use the architected timer for the delay loop. */
29         arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
30         arch_delay_timer.freq = arch_timer_get_rate();
31         register_current_timer_delay(&arch_delay_timer);
32 }
33
34 int __init arch_timer_arch_init(void)
35 {
36         u32 arch_timer_rate = arch_timer_get_rate();
37
38         if (arch_timer_rate == 0)
39                 return -ENXIO;
40
41         arch_timer_delay_timer_register();
42
43         return 0;
44 }