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/pm_clock.h> 17 #include <linux/platform_device.h> 18 #include <linux/mutex.h> 19 #include <linux/clk.h> 20 #include <linux/err.h> 21 22 #include "soc.h" 23 24 #ifdef CONFIG_PM_RUNTIME 25 static int omap1_pm_runtime_suspend(struct device *dev) 26 { 27 int ret; 28 29 dev_dbg(dev, "%s\n", __func__); 30 31 ret = pm_generic_runtime_suspend(dev); 32 if (ret) 33 return ret; 34 35 ret = pm_clk_suspend(dev); 36 if (ret) { 37 pm_generic_runtime_resume(dev); 38 return ret; 39 } 40 41 return 0; 42 } 43 44 static int omap1_pm_runtime_resume(struct device *dev) 45 { 46 dev_dbg(dev, "%s\n", __func__); 47 48 pm_clk_resume(dev); 49 return pm_generic_runtime_resume(dev); 50 } 51 52 static struct dev_pm_domain default_pm_domain = { 53 .ops = { 54 .runtime_suspend = omap1_pm_runtime_suspend, 55 .runtime_resume = omap1_pm_runtime_resume, 56 USE_PLATFORM_PM_SLEEP_OPS 57 }, 58 }; 59 #define OMAP1_PM_DOMAIN (&default_pm_domain) 60 #else 61 #define OMAP1_PM_DOMAIN NULL 62 #endif /* CONFIG_PM_RUNTIME */ 63 64 static struct pm_clk_notifier_block platform_bus_notifier = { 65 .pm_domain = OMAP1_PM_DOMAIN, 66 .con_ids = { "ick", "fck", NULL, }, 67 }; 68 69 static int __init omap1_pm_runtime_init(void) 70 { 71 if (!cpu_class_is_omap1()) 72 return -ENODEV; 73 74 pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier); 75 76 return 0; 77 } 78 core_initcall(omap1_pm_runtime_init); 79 80