[linux-block.git] / arch / arm / kernel / arch_timer.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/kernel/arch_timer.c
 *
 *  Copyright (C) 2011 ARM Ltd.
 *  All Rights Reserved
 */
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>

#include <asm/delay.h>
#include <asm/arch_timer.h>

#include <clocksource/arm_arch_timer.h>

static unsigned long arch_timer_read_counter_long(void)
{
	return arch_timer_read_counter();
}

static struct delay_timer arch_delay_timer;

static void __init arch_timer_delay_timer_register(void)
{
	/* Use the architected timer for the delay loop. */
	arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
	arch_delay_timer.freq = arch_timer_get_rate();
	register_current_timer_delay(&arch_delay_timer);
}

int __init arch_timer_arch_init(void)
{
        u32 arch_timer_rate = arch_timer_get_rate();

	if (arch_timer_rate == 0)
		return -ENXIO;

	arch_timer_delay_timer_register();

	return 0;
}
Commit	Line	Data
	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	}