projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d64f84f6 LP |
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 | ||
| ea389daa | 18 | int __init arm_cpuidle_init(unsigned int cpu) |
| d64f84f6 LP |
19 | { |
| 20 | int ret = -EOPNOTSUPP; | |
| d64f84f6 LP |
21 | |
| 22 | if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle) | |
| 819a8826 | 23 | ret = cpu_ops[cpu]->cpu_init_idle(cpu); |
| d64f84f6 | 24 | |
| d64f84f6 LP |
25 | return ret; |
| 26 | } | |
| af3cfdbf LP |
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 | */ | |
| af391b15 | 35 | int arm_cpuidle_suspend(int index) |
| af3cfdbf LP |
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; | |
| af391b15 | 45 | return cpu_ops[cpu]->cpu_suspend(index); |
| af3cfdbf | 46 | } |