2 * ARM64 CPU idle arch support
4 * Copyright (C) 2014 ARM Ltd.
5 * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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.
13 #include <linux/of_device.h>
15 #include <asm/cpuidle.h>
16 #include <asm/cpu_ops.h>
18 int arm_cpuidle_init(unsigned int cpu)
20 int ret = -EOPNOTSUPP;
21 struct device_node *cpu_node = of_cpu_device_node_get(cpu);
26 if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle)
27 ret = cpu_ops[cpu]->cpu_init_idle(cpu_node, cpu);
29 of_node_put(cpu_node);
34 * cpu_suspend() - function to enter a low-power idle state
35 * @arg: argument to pass to CPU suspend operations
37 * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
38 * operations back-end error code otherwise.
40 int cpu_suspend(unsigned long arg)
42 int cpu = smp_processor_id();
45 * If cpu_ops have not been registered or suspend
46 * has not been initialized, cpu_suspend call fails early.
48 if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_suspend)
50 return cpu_ops[cpu]->cpu_suspend(arg);