1/*
2 * ARM64 CPU idle arch support
3 *
4 * Copyright (C) 2014 ARM Ltd.
5 * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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
12#include <linux/of.h>
13#include <linux/of_device.h>
14
15#include <asm/cpuidle.h>
16#include <asm/cpu_ops.h>
17
18int __init arm_cpuidle_init(unsigned int cpu)
19{
20	int ret = -EOPNOTSUPP;
21
22	if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle)
23		ret = cpu_ops[cpu]->cpu_init_idle(cpu);
24
25	return ret;
26}
27
28/**
29 * cpu_suspend() - function to enter a low-power idle state
30 * @arg: argument to pass to CPU suspend operations
31 *
32 * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
33 * operations back-end error code otherwise.
34 */
35int arm_cpuidle_suspend(int index)
36{
37	int cpu = smp_processor_id();
38
39	/*
40	 * If cpu_ops have not been registered or suspend
41	 * has not been initialized, cpu_suspend call fails early.
42	 */
43	if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_suspend)
44		return -EOPNOTSUPP;
45	return cpu_ops[cpu]->cpu_suspend(index);
46}
47