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         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 */