| Kevin Hilman | 57e6fe7 | 2009-11-05 19:06:01 -0800 | [diff] [blame] | 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); |