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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 | } |