1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/arch/arm/kernel/arch_timer.c
4  *
5  *  Copyright (C) 2011 ARM Ltd.
6  *  All Rights Reserved
7  */
8 #include <linux/init.h>
9 #include <linux/types.h>
10 #include <linux/errno.h>
11 
12 #include <asm/delay.h>
13 #include <asm/arch_timer.h>
14 
15 #include <clocksource/arm_arch_timer.h>
16 
arch_timer_read_counter_long(void)17 static unsigned long arch_timer_read_counter_long(void)
18 {
19 	return arch_timer_read_counter();
20 }
21 
22 static struct delay_timer arch_delay_timer;
23 
arch_timer_delay_timer_register(void)24 static void __init arch_timer_delay_timer_register(void)
25 {
26 	/* Use the architected timer for the delay loop. */
27 	arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
28 	arch_delay_timer.freq = arch_timer_get_rate();
29 	register_current_timer_delay(&arch_delay_timer);
30 }
31 
arch_timer_arch_init(void)32 int __init arch_timer_arch_init(void)
33 {
34         u32 arch_timer_rate = arch_timer_get_rate();
35 
36 	if (arch_timer_rate == 0)
37 		return -ENXIO;
38 
39 	arch_timer_delay_timer_register();
40 
41 	return 0;
42 }
43