arch/arm/mach-omap1/pm_bus.c

   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         int ret = 0;
  52         struct clk *iclk, *fclk;
  53
  54         dev_dbg(dev, "%s\n", __func__);
  55
  56         iclk = clk_get(dev, "ick");
  57         if (!IS_ERR(iclk)) {
  58                 clk_enable(iclk);
  59                 clk_put(iclk);
  60         }
  61
  62         fclk = clk_get(dev, "fck");
  63         if (!IS_ERR(fclk)) {
  64                 clk_enable(fclk);
  65                 clk_put(fclk);
  66         }
  67
  68         return pm_generic_runtime_resume(dev);
  69 };
  70
  71 static int __init omap1_pm_runtime_init(void)
  72 {
  73         const struct dev_pm_ops *pm;
  74         struct dev_pm_ops *omap_pm;
  75
  76         pm = platform_bus_get_pm_ops();
  77         if (!pm) {
  78                 pr_err("%s: unable to get dev_pm_ops from platform_bus\n",
  79                         __func__);
  80                 return -ENODEV;
  81         }
  82
  83         omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL);
  84         if (!omap_pm) {
  85                 pr_err("%s: unable to alloc memory for new dev_pm_ops\n",
  86                         __func__);
  87                 return -ENOMEM;
  88         }
  89
  90         omap_pm->runtime_suspend = omap1_pm_runtime_suspend;
  91         omap_pm->runtime_resume = omap1_pm_runtime_resume;
  92
  93         platform_bus_set_pm_ops(omap_pm);
  94
  95         return 0;
  96 }
  97 core_initcall(omap1_pm_runtime_init);
  98 #endif /* CONFIG_PM_RUNTIME */