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
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
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
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
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