projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2da50e62 RL |
1 | /* |
| 2 | * Copyright 2012 Freescale Semiconductor, Inc. | |
| 3 | * Copyright 2012 Linaro Ltd. | |
| 4 | * | |
| 5 | * The code contained herein is licensed under the GNU General Public | |
| 6 | * License. You may obtain a copy of the GNU General Public License | |
| 7 | * Version 2 or later at the following locations: | |
| 8 | * | |
| 9 | * http://www.opensource.org/licenses/gpl-license.html | |
| 10 | * http://www.gnu.org/copyleft/gpl.html | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/cpuidle.h> | |
| 14 | #include <linux/err.h> | |
| 15 | #include <linux/hrtimer.h> | |
| 16 | #include <linux/io.h> | |
| 17 | #include <linux/kernel.h> | |
| 18 | #include <linux/slab.h> | |
| 19 | ||
| 20 | static struct cpuidle_device __percpu * imx_cpuidle_devices; | |
| 21 | ||
| 22 | static void __init imx_cpuidle_devices_uninit(void) | |
| 23 | { | |
| 24 | int cpu_id; | |
| 25 | struct cpuidle_device *dev; | |
| 26 | ||
| 27 | for_each_possible_cpu(cpu_id) { | |
| 28 | dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id); | |
| 29 | cpuidle_unregister_device(dev); | |
| 30 | } | |
| 31 | ||
| 32 | free_percpu(imx_cpuidle_devices); | |
| 33 | } | |
| 34 | ||
| 35 | int __init imx_cpuidle_init(struct cpuidle_driver *drv) | |
| 36 | { | |
| 37 | struct cpuidle_device *dev; | |
| 38 | int cpu_id, ret; | |
| 39 | ||
| 40 | if (drv->state_count > CPUIDLE_STATE_MAX) { | |
| 41 | pr_err("%s: state_count exceeds maximum\n", __func__); | |
| 42 | return -EINVAL; | |
| 43 | } | |
| 44 | ||
| 45 | ret = cpuidle_register_driver(drv); | |
| 46 | if (ret) { | |
| 47 | pr_err("%s: Failed to register cpuidle driver with error: %d\n", | |
| 48 | __func__, ret); | |
| 49 | return ret; | |
| 50 | } | |
| 51 | ||
| 52 | imx_cpuidle_devices = alloc_percpu(struct cpuidle_device); | |
| 53 | if (imx_cpuidle_devices == NULL) { | |
| 54 | ret = -ENOMEM; | |
| 55 | goto unregister_drv; | |
| 56 | } | |
| 57 | ||
| 58 | /* initialize state data for each cpuidle_device */ | |
| 59 | for_each_possible_cpu(cpu_id) { | |
| 60 | dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id); | |
| 61 | dev->cpu = cpu_id; | |
| 62 | dev->state_count = drv->state_count; | |
| 63 | ||
| 64 | ret = cpuidle_register_device(dev); | |
| 65 | if (ret) { | |
| 66 | pr_err("%s: Failed to register cpu %u, error: %d\n", | |
| 67 | __func__, cpu_id, ret); | |
| 68 | goto uninit; | |
| 69 | } | |
| 70 | } | |
| 71 | ||
| 72 | return 0; | |
| 73 | ||
| 74 | uninit: | |
| 75 | imx_cpuidle_devices_uninit(); | |
| 76 | ||
| 77 | unregister_drv: | |
| 78 | cpuidle_unregister_driver(drv); | |
| 79 | return ret; | |
| 80 | } |