Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
[linux-2.6.git] / arch / arm / mach-omap2 / pm_bus.c
1 /*
2  * Runtime PM support code for OMAP
3  *
4  * Author: Kevin Hilman, Deep Root Systems, LLC
5  *
6  * Copyright (C) 2010 Texas Instruments, Inc.
7  *
8  * This file is licensed under the terms of the GNU General Public
9  * License version 2. This program is licensed "as is" without any
10  * warranty of any kind, whether express or implied.
11  */
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/io.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/platform_device.h>
17 #include <linux/mutex.h>
18
19 #include <plat/omap_device.h>
20 #include <plat/omap-pm.h>
21
22 #ifdef CONFIG_PM_RUNTIME
23 int omap_pm_runtime_suspend(struct device *dev)
24 {
25         struct platform_device *pdev = to_platform_device(dev);
26         int r, ret = 0;
27
28         dev_dbg(dev, "%s\n", __func__);
29
30         ret = pm_generic_runtime_suspend(dev);
31
32         if (!ret && dev->parent == &omap_device_parent) {
33                 r = omap_device_idle(pdev);
34                 WARN_ON(r);
35         }
36
37         return ret;
38 };
39
40 int omap_pm_runtime_resume(struct device *dev)
41 {
42         struct platform_device *pdev = to_platform_device(dev);
43         int r;
44
45         dev_dbg(dev, "%s\n", __func__);
46
47         if (dev->parent == &omap_device_parent) {
48                 r = omap_device_enable(pdev);
49                 WARN_ON(r);
50         }
51
52         return pm_generic_runtime_resume(dev);
53 };
54 #else
55 #define omap_pm_runtime_suspend NULL
56 #define omap_pm_runtime_resume NULL
57 #endif /* CONFIG_PM_RUNTIME */
58
59 static int __init omap_pm_runtime_init(void)
60 {
61         const struct dev_pm_ops *pm;
62         struct dev_pm_ops *omap_pm;
63
64         pm = platform_bus_get_pm_ops();
65         if (!pm) {
66                 pr_err("%s: unable to get dev_pm_ops from platform_bus\n",
67                         __func__);
68                 return -ENODEV;
69         }
70
71         omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL);
72         if (!omap_pm) {
73                 pr_err("%s: unable to alloc memory for new dev_pm_ops\n",
74                         __func__);
75                 return -ENOMEM;
76         }
77
78         omap_pm->runtime_suspend = omap_pm_runtime_suspend;
79         omap_pm->runtime_resume = omap_pm_runtime_resume;
80
81         platform_bus_set_pm_ops(omap_pm);
82
83         return 0;
84 }
85 core_initcall(omap_pm_runtime_init);