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pm_bus.c

/*
 * Runtime PM support code for OMAP1
 *
 * Author: Kevin Hilman, Deep Root Systems, LLC
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <plat/omap_device.h>
#include <plat/omap-pm.h>

#ifdef CONFIG_PM_RUNTIME
static int omap1_pm_runtime_suspend(struct device *dev)
{
      struct clk *iclk, *fclk;
      int ret = 0;

      dev_dbg(dev, "%s\n", __func__);

      ret = pm_generic_runtime_suspend(dev);

      fclk = clk_get(dev, "fck");
      if (!IS_ERR(fclk)) {
            clk_disable(fclk);
            clk_put(fclk);
      }

      iclk = clk_get(dev, "ick");
      if (!IS_ERR(iclk)) {
            clk_disable(iclk);
            clk_put(iclk);
      }

      return 0;
};

static int omap1_pm_runtime_resume(struct device *dev)
{
      struct clk *iclk, *fclk;

      dev_dbg(dev, "%s\n", __func__);

      iclk = clk_get(dev, "ick");
      if (!IS_ERR(iclk)) {
            clk_enable(iclk);
            clk_put(iclk);
      }

      fclk = clk_get(dev, "fck");
      if (!IS_ERR(fclk)) {
            clk_enable(fclk);
            clk_put(fclk);
      }

      return pm_generic_runtime_resume(dev);
};

static int __init omap1_pm_runtime_init(void)
{
      const struct dev_pm_ops *pm;
      struct dev_pm_ops *omap_pm;

      if (!cpu_class_is_omap1())
            return -ENODEV;

      pm = platform_bus_get_pm_ops();
      if (!pm) {
            pr_err("%s: unable to get dev_pm_ops from platform_bus\n",
                  __func__);
            return -ENODEV;
      }

      omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL);
      if (!omap_pm) {
            pr_err("%s: unable to alloc memory for new dev_pm_ops\n",
                  __func__);
            return -ENOMEM;
      }

      omap_pm->runtime_suspend = omap1_pm_runtime_suspend;
      omap_pm->runtime_resume = omap1_pm_runtime_resume;

      platform_bus_set_pm_ops(omap_pm);

      return 0;
}
core_initcall(omap1_pm_runtime_init);
#endif /* CONFIG_PM_RUNTIME */

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