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
19static unsigned long arch_timer_read_counter_long(void)
20{
21	return arch_timer_read_counter();
22}
23
24static struct delay_timer arch_delay_timer;
25
26static 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
34int __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}

 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
17static unsigned long arch_timer_read_counter_long(void)
18{
19	return arch_timer_read_counter();
20}
21
22static struct delay_timer arch_delay_timer;
23
24static 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
32int __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}