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 { 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 75 if (!cpu_class_is_omap1()) 76 return -ENODEV; 77 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 */ 101