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