summaryrefslogtreecommitdiffstats
path: root/arch/arm64/kernel/cpuidle.c
blob: e11857fce05f7f4851e3827e01744f9ef4d7c0a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
/*
 * ARM64 CPU idle arch support
 *
 * Copyright (C) 2014 ARM Ltd.
 * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/of.h>
#include <linux/of_device.h>

#include <asm/cpuidle.h>
#include <asm/cpu_ops.h>

int __init arm_cpuidle_init(unsigned int cpu)
{
	int ret = -EOPNOTSUPP;

	if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_suspend &&
			cpu_ops[cpu]->cpu_init_idle)
		ret = cpu_ops[cpu]->cpu_init_idle(cpu);

	return ret;
}

/**
 * cpu_suspend() - function to enter a low-power idle state
 * @arg: argument to pass to CPU suspend operations
 *
 * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
 * operations back-end error code otherwise.
 */
int arm_cpuidle_suspend(int index)
{
	int cpu = smp_processor_id();

	return cpu_ops[cpu]->cpu_suspend(index);
}