| /* |
| * 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_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(); |
| |
| /* |
| * 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(index); |
| } |