| Kevin Hilman | e933ec7 | 2010-06-17 15:48:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Runtime PM support code for OMAP1 |
| 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 | #include <linux/clk.h> |
| 19 | #include <linux/err.h> |
| 20 | |
| 21 | #include <plat/omap_device.h> |
| 22 | #include <plat/omap-pm.h> |
| 23 | |
| 24 | #ifdef CONFIG_PM_RUNTIME |
| 25 | static int omap1_pm_runtime_suspend(struct device *dev) |
| 26 | { |
| 27 | struct clk *iclk, *fclk; |
| 28 | int ret = 0; |
| 29 | |
| 30 | dev_dbg(dev, "%s\n", __func__); |
| 31 | |
| 32 | ret = pm_generic_runtime_suspend(dev); |
| 33 | |
| 34 | fclk = clk_get(dev, "fck"); |
| 35 | if (!IS_ERR(fclk)) { |
| 36 | clk_disable(fclk); |
| 37 | clk_put(fclk); |
| 38 | } |
| 39 | |
| 40 | iclk = clk_get(dev, "ick"); |
| 41 | if (!IS_ERR(iclk)) { |
| 42 | clk_disable(iclk); |
| 43 | clk_put(iclk); |
| 44 | } |
| 45 | |
| 46 | return 0; |
| 47 | }; |
| 48 | |
| 49 | static int omap1_pm_runtime_resume(struct device *dev) |
| 50 | { |
| Kevin Hilman | e933ec7 | 2010-06-17 15:48:43 -0700 | [diff] [blame] | 51 | struct clk *iclk, *fclk; |
| 52 | |
| 53 | dev_dbg(dev, "%s\n", __func__); |
| 54 | |
| 55 | iclk = clk_get(dev, "ick"); |
| 56 | if (!IS_ERR(iclk)) { |
| 57 | clk_enable(iclk); |
| 58 | clk_put(iclk); |
| 59 | } |
| 60 | |
| 61 | fclk = clk_get(dev, "fck"); |
| 62 | if (!IS_ERR(fclk)) { |
| 63 | clk_enable(fclk); |
| 64 | clk_put(fclk); |
| 65 | } |
| 66 | |
| 67 | return pm_generic_runtime_resume(dev); |
| 68 | }; |
| 69 | |
| 70 | static int __init omap1_pm_runtime_init(void) |
| 71 | { |
| 72 | const struct dev_pm_ops *pm; |
| 73 | struct dev_pm_ops *omap_pm; |
| 74 | |
| Tony Lindgren | 7f9187c | 2010-12-10 09:46:24 -0800 | [diff] [blame] | 75 | if (!cpu_class_is_omap1()) |
| 76 | return -ENODEV; |
| 77 | |
| Kevin Hilman | e933ec7 | 2010-06-17 15:48:43 -0700 | [diff] [blame] | 78 | pm = platform_bus_get_pm_ops(); |
| 79 | if (!pm) { |
| 80 | pr_err("%s: unable to get dev_pm_ops from platform_bus\n", |
| 81 | __func__); |
| 82 | return -ENODEV; |
| 83 | } |
| 84 | |
| 85 | omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL); |
| 86 | if (!omap_pm) { |
| 87 | pr_err("%s: unable to alloc memory for new dev_pm_ops\n", |
| 88 | __func__); |
| 89 | return -ENOMEM; |
| 90 | } |
| 91 | |
| 92 | omap_pm->runtime_suspend = omap1_pm_runtime_suspend; |
| 93 | omap_pm->runtime_resume = omap1_pm_runtime_resume; |
| 94 | |
| 95 | platform_bus_set_pm_ops(omap_pm); |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | core_initcall(omap1_pm_runtime_init); |
| 100 | #endif /* CONFIG_PM_RUNTIME */ |