| Robert Lee | 2da50e6 | 2012-05-21 17:50:28 -0500 | [diff] [blame] | 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 | } |