/* * 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 arm_cpuidle_init(unsigned int cpu) { int ret = -EOPNOTSUPP; struct device_node *cpu_node = of_cpu_device_node_get(cpu); if (!cpu_node) return -ENODEV; if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle) ret = cpu_ops[cpu]->cpu_init_idle(cpu_node, cpu); of_node_put(cpu_node); 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 cpu_suspend(unsigned long arg) { int cpu = smp_processor_id(); /* * If cpu_ops have not been registered or suspend * has not been initialized, cpu_suspend call fails early. */ if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_suspend) return -EOPNOTSUPP; return cpu_ops[cpu]->cpu_suspend(arg); }