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omap_device.c

/*
 * omap_device implementation
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 * Paul Walmsley, Kevin Hilman
 *
 * Developed in collaboration with (alphabetical order): Benoit
 * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
 * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
 * Woodruff
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This code provides a consistent interface for OMAP device drivers
 * to control power management and interconnect properties of their
 * devices.
 *
 * In the medium- to long-term, this code should either be
 * a) implemented via arch-specific pointers in platform_data
 * or
 * b) implemented as a proper omap_bus/omap_device in Linux, no more
 *    platform_data func pointers
 *
 *
 * Guidelines for usage by driver authors:
 *
 * 1. These functions are intended to be used by device drivers via
 * function pointers in struct platform_data.  As an example,
 * omap_device_enable() should be passed to the driver as
 *
 * struct foo_driver_platform_data {
 * ...
 *      int (*device_enable)(struct platform_device *pdev);
 * ...
 * }
 *
 * Note that the generic "device_enable" name is used, rather than
 * "omap_device_enable".  This is so other architectures can pass in their
 * own enable/disable functions here.
 *
 * This should be populated during device setup:
 *
 * ...
 * pdata->device_enable = omap_device_enable;
 * ...
 *
 * 2. Drivers should first check to ensure the function pointer is not null
 * before calling it, as in:
 *
 * if (pdata->device_enable)
 *     pdata->device_enable(pdev);
 *
 * This allows other architectures that don't use similar device_enable()/
 * device_shutdown() functions to execute normally.
 *
 * ...
 *
 * Suggested usage by device drivers:
 *
 * During device initialization:
 * device_enable()
 *
 * During device idle:
 * (save remaining device context if necessary)
 * device_idle();
 *
 * During device resume:
 * device_enable();
 * (restore context if necessary)
 *
 * During device shutdown:
 * device_shutdown()
 * (device must be reinitialized at this point to use it again)
 *
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>

#include <plat/omap_device.h>
#include <plat/omap_hwmod.h>

/* These parameters are passed to _omap_device_{de,}activate() */
#define USE_WAKEUP_LAT              0
#define IGNORE_WAKEUP_LAT           1

/* Private functions */

/**
 * _omap_device_activate - increase device readiness
 * @od: struct omap_device *
 * @ignore_lat: increase to latency target (0) or full readiness (1)?
 *
 * Increase readiness of omap_device @od (thus decreasing device
 * wakeup latency, but consuming more power).  If @ignore_lat is
 * IGNORE_WAKEUP_LAT, make the omap_device fully active.  Otherwise,
 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
 * latency is greater than the requested maximum wakeup latency, step
 * backwards in the omap_device_pm_latency table to ensure the
 * device's maximum wakeup latency is less than or equal to the
 * requested maximum wakeup latency.  Returns 0.
 */
static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
{
      struct timespec a, b, c;

      pr_debug("omap_device: %s: activating\n", od->pdev.name);

      while (od->pm_lat_level > 0) {
            struct omap_device_pm_latency *odpl;
            unsigned long long act_lat = 0;

            od->pm_lat_level--;

            odpl = od->pm_lats + od->pm_lat_level;

            if (!ignore_lat &&
                (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
                  break;

            read_persistent_clock(&a);

            /* XXX check return code */
            odpl->activate_func(od);

            read_persistent_clock(&b);

            c = timespec_sub(b, a);
            act_lat = timespec_to_ns(&c);

            pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time "
                   "%llu nsec\n", od->pdev.name, od->pm_lat_level,
                   act_lat);

            if (act_lat > odpl->activate_lat) {
                  odpl->activate_lat_worst = act_lat;
                  if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
                        odpl->activate_lat = act_lat;
                        pr_warning("omap_device: %s.%d: new worst case "
                                 "activate latency %d: %llu\n",
                                 od->pdev.name, od->pdev.id,
                                 od->pm_lat_level, act_lat);
                  } else
                        pr_warning("omap_device: %s.%d: activate "
                                 "latency %d higher than exptected. "
                                 "(%llu > %d)\n",
                                 od->pdev.name, od->pdev.id,
                                 od->pm_lat_level, act_lat,
                                 odpl->activate_lat);
            }

            od->dev_wakeup_lat -= odpl->activate_lat;
      }

      return 0;
}

/**
 * _omap_device_deactivate - decrease device readiness
 * @od: struct omap_device *
 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
 *
 * Decrease readiness of omap_device @od (thus increasing device
 * wakeup latency, but conserving power).  If @ignore_lat is
 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive.  Otherwise,
 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
 * latency is less than the requested maximum wakeup latency, step
 * forwards in the omap_device_pm_latency table to ensure the device's
 * maximum wakeup latency is less than or equal to the requested
 * maximum wakeup latency.  Returns 0.
 */
static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
{
      struct timespec a, b, c;

      pr_debug("omap_device: %s: deactivating\n", od->pdev.name);

      while (od->pm_lat_level < od->pm_lats_cnt) {
            struct omap_device_pm_latency *odpl;
            unsigned long long deact_lat = 0;

            odpl = od->pm_lats + od->pm_lat_level;

            if (!ignore_lat &&
                ((od->dev_wakeup_lat + odpl->activate_lat) >
                 od->_dev_wakeup_lat_limit))
                  break;

            read_persistent_clock(&a);

            /* XXX check return code */
            odpl->deactivate_func(od);

            read_persistent_clock(&b);

            c = timespec_sub(b, a);
            deact_lat = timespec_to_ns(&c);

            pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time "
                   "%llu nsec\n", od->pdev.name, od->pm_lat_level,
                   deact_lat);

            if (deact_lat > odpl->deactivate_lat) {
                  odpl->deactivate_lat_worst = deact_lat;
                  if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
                        odpl->deactivate_lat = deact_lat;
                        pr_warning("omap_device: %s.%d: new worst case "
                                 "deactivate latency %d: %llu\n",
                                 od->pdev.name, od->pdev.id,
                                 od->pm_lat_level, deact_lat);
                  } else
                        pr_warning("omap_device: %s.%d: deactivate "
                                 "latency %d higher than exptected. "
                                 "(%llu > %d)\n",
                                 od->pdev.name, od->pdev.id,
                                 od->pm_lat_level, deact_lat,
                                 odpl->deactivate_lat);
            }


            od->dev_wakeup_lat += odpl->activate_lat;

            od->pm_lat_level++;
      }

      return 0;
}

static inline struct omap_device *_find_by_pdev(struct platform_device *pdev)
{
      return container_of(pdev, struct omap_device, pdev);
}

/**
 * _add_optional_clock_alias - Add clock alias for hwmod optional clocks
 * @od: struct omap_device *od
 *
 * For every optional clock present per hwmod per omap_device, this function
 * adds an entry in the clocks list of the form <dev-id=dev_name, con-id=role>
 * if an entry is already present in it with the form <dev-id=NULL, con-id=role>
 *
 * The function is called from inside omap_device_build_ss(), after
 * omap_device_register.
 *
 * This allows drivers to get a pointer to its optional clocks based on its role
 * by calling clk_get(<dev*>, <role>).
 *
 * No return value.
 */
static void _add_optional_clock_alias(struct omap_device *od,
                              struct omap_hwmod *oh)
{
      int i;

      for (i = 0; i < oh->opt_clks_cnt; i++) {
            struct omap_hwmod_opt_clk *oc;
            int r;

            oc = &oh->opt_clks[i];

            if (!oc->_clk)
                  continue;

            r = clk_add_alias(oc->role, dev_name(&od->pdev.dev),
                          (char *)oc->clk, &od->pdev.dev);
            if (r)
                  pr_err("omap_device: %s: clk_add_alias for %s failed\n",
                         dev_name(&od->pdev.dev), oc->role);
      }
}


/* Public functions for use by core code */

/**
 * omap_device_get_context_loss_count - get lost context count
 * @od: struct omap_device *
 *
 * Using the primary hwmod, query the context loss count for this
 * device.
 *
 * Callers should consider context for this device lost any time this
 * function returns a value different than the value the caller got
 * the last time it called this function.
 *
 * If any hwmods exist for the omap_device assoiated with @pdev,
 * return the context loss counter for that hwmod, otherwise return
 * zero.
 */
u32 omap_device_get_context_loss_count(struct platform_device *pdev)
{
      struct omap_device *od;
      u32 ret = 0;

      od = _find_by_pdev(pdev);

      if (od->hwmods_cnt)
            ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);

      return ret;
}

/**
 * omap_device_count_resources - count number of struct resource entries needed
 * @od: struct omap_device *
 *
 * Count the number of struct resource entries needed for this
 * omap_device @od.  Used by omap_device_build_ss() to determine how
 * much memory to allocate before calling
 * omap_device_fill_resources().  Returns the count.
 */
int omap_device_count_resources(struct omap_device *od)
{
      int c = 0;
      int i;

      for (i = 0; i < od->hwmods_cnt; i++)
            c += omap_hwmod_count_resources(od->hwmods[i]);

      pr_debug("omap_device: %s: counted %d total resources across %d "
             "hwmods\n", od->pdev.name, c, od->hwmods_cnt);

      return c;
}

/**
 * omap_device_fill_resources - fill in array of struct resource
 * @od: struct omap_device *
 * @res: pointer to an array of struct resource to be filled in
 *
 * Populate one or more empty struct resource pointed to by @res with
 * the resource data for this omap_device @od.  Used by
 * omap_device_build_ss() after calling omap_device_count_resources().
 * Ideally this function would not be needed at all.  If omap_device
 * replaces platform_device, then we can specify our own
 * get_resource()/ get_irq()/etc functions that use the underlying
 * omap_hwmod information.  Or if platform_device is extended to use
 * subarchitecture-specific function pointers, the various
 * platform_device functions can simply call omap_device internal
 * functions to get device resources.  Hacking around the existing
 * platform_device code wastes memory.  Returns 0.
 */
int omap_device_fill_resources(struct omap_device *od, struct resource *res)
{
      int c = 0;
      int i, r;

      for (i = 0; i < od->hwmods_cnt; i++) {
            r = omap_hwmod_fill_resources(od->hwmods[i], res);
            res += r;
            c += r;
      }

      return 0;
}

/**
 * omap_device_build - build and register an omap_device with one omap_hwmod
 * @pdev_name: name of the platform_device driver to use
 * @pdev_id: this platform_device's connection ID
 * @oh: ptr to the single omap_hwmod that backs this omap_device
 * @pdata: platform_data ptr to associate with the platform_device
 * @pdata_len: amount of memory pointed to by @pdata
 * @pm_lats: pointer to a omap_device_pm_latency array for this device
 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
 * @is_early_device: should the device be registered as an early device or not
 *
 * Convenience function for building and registering a single
 * omap_device record, which in turn builds and registers a
 * platform_device record.  See omap_device_build_ss() for more
 * information.  Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
 * passes along the return value of omap_device_build_ss().
 */
struct omap_device *omap_device_build(const char *pdev_name, int pdev_id,
                              struct omap_hwmod *oh, void *pdata,
                              int pdata_len,
                              struct omap_device_pm_latency *pm_lats,
                              int pm_lats_cnt, int is_early_device)
{
      struct omap_hwmod *ohs[] = { oh };

      if (!oh)
            return ERR_PTR(-EINVAL);

      return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
                            pdata_len, pm_lats, pm_lats_cnt,
                            is_early_device);
}

/**
 * omap_device_build_ss - build and register an omap_device with multiple hwmods
 * @pdev_name: name of the platform_device driver to use
 * @pdev_id: this platform_device's connection ID
 * @oh: ptr to the single omap_hwmod that backs this omap_device
 * @pdata: platform_data ptr to associate with the platform_device
 * @pdata_len: amount of memory pointed to by @pdata
 * @pm_lats: pointer to a omap_device_pm_latency array for this device
 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
 * @is_early_device: should the device be registered as an early device or not
 *
 * Convenience function for building and registering an omap_device
 * subsystem record.  Subsystem records consist of multiple
 * omap_hwmods.  This function in turn builds and registers a
 * platform_device record.  Returns an ERR_PTR() on error, or passes
 * along the return value of omap_device_register().
 */
struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
                               struct omap_hwmod **ohs, int oh_cnt,
                               void *pdata, int pdata_len,
                               struct omap_device_pm_latency *pm_lats,
                               int pm_lats_cnt, int is_early_device)
{
      int ret = -ENOMEM;
      struct omap_device *od;
      char *pdev_name2;
      struct resource *res = NULL;
      int i, res_count;
      struct omap_hwmod **hwmods;

      if (!ohs || oh_cnt == 0 || !pdev_name)
            return ERR_PTR(-EINVAL);

      if (!pdata && pdata_len > 0)
            return ERR_PTR(-EINVAL);

      pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name,
             oh_cnt);

      od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
      if (!od)
            return ERR_PTR(-ENOMEM);

      od->hwmods_cnt = oh_cnt;

      hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt,
                   GFP_KERNEL);
      if (!hwmods)
            goto odbs_exit1;

      memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt);
      od->hwmods = hwmods;

      pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL);
      if (!pdev_name2)
            goto odbs_exit2;
      strcpy(pdev_name2, pdev_name);

      od->pdev.name = pdev_name2;
      od->pdev.id = pdev_id;

      res_count = omap_device_count_resources(od);
      if (res_count > 0) {
            res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
            if (!res)
                  goto odbs_exit3;
      }
      omap_device_fill_resources(od, res);

      od->pdev.num_resources = res_count;
      od->pdev.resource = res;

      ret = platform_device_add_data(&od->pdev, pdata, pdata_len);
      if (ret)
            goto odbs_exit4;

      od->pm_lats = pm_lats;
      od->pm_lats_cnt = pm_lats_cnt;

      if (is_early_device)
            ret = omap_early_device_register(od);
      else
            ret = omap_device_register(od);

      for (i = 0; i < oh_cnt; i++) {
            hwmods[i]->od = od;
            _add_optional_clock_alias(od, hwmods[i]);
      }

      if (ret)
            goto odbs_exit4;

      return od;

odbs_exit4:
      kfree(res);
odbs_exit3:
      kfree(pdev_name2);
odbs_exit2:
      kfree(hwmods);
odbs_exit1:
      kfree(od);

      pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);

      return ERR_PTR(ret);
}

/**
 * omap_early_device_register - register an omap_device as an early platform
 * device.
 * @od: struct omap_device * to register
 *
 * Register the omap_device structure.  This currently just calls
 * platform_early_add_device() on the underlying platform_device.
 * Returns 0 by default.
 */
int omap_early_device_register(struct omap_device *od)
{
      struct platform_device *devices[1];

      devices[0] = &(od->pdev);
      early_platform_add_devices(devices, 1);
      return 0;
}

/**
 * omap_device_register - register an omap_device with one omap_hwmod
 * @od: struct omap_device * to register
 *
 * Register the omap_device structure.  This currently just calls
 * platform_device_register() on the underlying platform_device.
 * Returns the return value of platform_device_register().
 */
int omap_device_register(struct omap_device *od)
{
      pr_debug("omap_device: %s: registering\n", od->pdev.name);

      od->pdev.dev.parent = &omap_device_parent;
      return platform_device_register(&od->pdev);
}


/* Public functions for use by device drivers through struct platform_data */

/**
 * omap_device_enable - fully activate an omap_device
 * @od: struct omap_device * to activate
 *
 * Do whatever is necessary for the hwmods underlying omap_device @od
 * to be accessible and ready to operate.  This generally involves
 * enabling clocks, setting SYSCONFIG registers; and in the future may
 * involve remuxing pins.  Device drivers should call this function
 * (through platform_data function pointers) where they would normally
 * enable clocks, etc.  Returns -EINVAL if called when the omap_device
 * is already enabled, or passes along the return value of
 * _omap_device_activate().
 */
int omap_device_enable(struct platform_device *pdev)
{
      int ret;
      struct omap_device *od;

      od = _find_by_pdev(pdev);

      if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
            WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
                 od->pdev.name, od->pdev.id, __func__, od->_state);
            return -EINVAL;
      }

      /* Enable everything if we're enabling this device from scratch */
      if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
            od->pm_lat_level = od->pm_lats_cnt;

      ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);

      od->dev_wakeup_lat = 0;
      od->_dev_wakeup_lat_limit = UINT_MAX;
      od->_state = OMAP_DEVICE_STATE_ENABLED;

      return ret;
}

/**
 * omap_device_idle - idle an omap_device
 * @od: struct omap_device * to idle
 *
 * Idle omap_device @od by calling as many .deactivate_func() entries
 * in the omap_device's pm_lats table as is possible without exceeding
 * the device's maximum wakeup latency limit, pm_lat_limit.  Device
 * drivers should call this function (through platform_data function
 * pointers) where they would normally disable clocks after operations
 * complete, etc..  Returns -EINVAL if the omap_device is not
 * currently enabled, or passes along the return value of
 * _omap_device_deactivate().
 */
int omap_device_idle(struct platform_device *pdev)
{
      int ret;
      struct omap_device *od;

      od = _find_by_pdev(pdev);

      if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
            WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
                 od->pdev.name, od->pdev.id, __func__, od->_state);
            return -EINVAL;
      }

      ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);

      od->_state = OMAP_DEVICE_STATE_IDLE;

      return ret;
}

/**
 * omap_device_shutdown - shut down an omap_device
 * @od: struct omap_device * to shut down
 *
 * Shut down omap_device @od by calling all .deactivate_func() entries
 * in the omap_device's pm_lats table and then shutting down all of
 * the underlying omap_hwmods.  Used when a device is being "removed"
 * or a device driver is being unloaded.  Returns -EINVAL if the
 * omap_device is not currently enabled or idle, or passes along the
 * return value of _omap_device_deactivate().
 */
int omap_device_shutdown(struct platform_device *pdev)
{
      int ret, i;
      struct omap_device *od;

      od = _find_by_pdev(pdev);

      if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
          od->_state != OMAP_DEVICE_STATE_IDLE) {
            WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
                 od->pdev.name, od->pdev.id, __func__, od->_state);
            return -EINVAL;
      }

      ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);

      for (i = 0; i < od->hwmods_cnt; i++)
            omap_hwmod_shutdown(od->hwmods[i]);

      od->_state = OMAP_DEVICE_STATE_SHUTDOWN;

      return ret;
}

/**
 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
 * @od: struct omap_device *
 *
 * When a device's maximum wakeup latency limit changes, call some of
 * the .activate_func or .deactivate_func function pointers in the
 * omap_device's pm_lats array to ensure that the device's maximum
 * wakeup latency is less than or equal to the new latency limit.
 * Intended to be called by OMAP PM code whenever a device's maximum
 * wakeup latency limit changes (e.g., via
 * omap_pm_set_dev_wakeup_lat()).  Returns 0 if nothing needs to be
 * done (e.g., if the omap_device is not currently idle, or if the
 * wakeup latency is already current with the new limit) or passes
 * along the return value of _omap_device_deactivate() or
 * _omap_device_activate().
 */
int omap_device_align_pm_lat(struct platform_device *pdev,
                       u32 new_wakeup_lat_limit)
{
      int ret = -EINVAL;
      struct omap_device *od;

      od = _find_by_pdev(pdev);

      if (new_wakeup_lat_limit == od->dev_wakeup_lat)
            return 0;

      od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;

      if (od->_state != OMAP_DEVICE_STATE_IDLE)
            return 0;
      else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
            ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
      else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
            ret = _omap_device_activate(od, USE_WAKEUP_LAT);

      return ret;
}

/**
 * omap_device_get_pwrdm - return the powerdomain * associated with @od
 * @od: struct omap_device *
 *
 * Return the powerdomain associated with the first underlying
 * omap_hwmod for this omap_device.  Intended for use by core OMAP PM
 * code.  Returns NULL on error or a struct powerdomain * upon
 * success.
 */
struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
{
      /*
       * XXX Assumes that all omap_hwmod powerdomains are identical.
       * This may not necessarily be true.  There should be a sanity
       * check in here to WARN() if any difference appears.
       */
      if (!od->hwmods_cnt)
            return NULL;

      return omap_hwmod_get_pwrdm(od->hwmods[0]);
}

/**
 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
 * @od: struct omap_device *
 *
 * Return the MPU's virtual address for the base of the hwmod, from
 * the ioremap() that the hwmod code does.  Only valid if there is one
 * hwmod associated with this device.  Returns NULL if there are zero
 * or more than one hwmods associated with this omap_device;
 * otherwise, passes along the return value from
 * omap_hwmod_get_mpu_rt_va().
 */
void __iomem *omap_device_get_rt_va(struct omap_device *od)
{
      if (od->hwmods_cnt != 1)
            return NULL;

      return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
}

/*
 * Public functions intended for use in omap_device_pm_latency
 * .activate_func and .deactivate_func function pointers
 */

/**
 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
 * @od: struct omap_device *od
 *
 * Enable all underlying hwmods.  Returns 0.
 */
int omap_device_enable_hwmods(struct omap_device *od)
{
      int i;

      for (i = 0; i < od->hwmods_cnt; i++)
            omap_hwmod_enable(od->hwmods[i]);

      /* XXX pass along return value here? */
      return 0;
}

/**
 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
 * @od: struct omap_device *od
 *
 * Idle all underlying hwmods.  Returns 0.
 */
int omap_device_idle_hwmods(struct omap_device *od)
{
      int i;

      for (i = 0; i < od->hwmods_cnt; i++)
            omap_hwmod_idle(od->hwmods[i]);

      /* XXX pass along return value here? */
      return 0;
}

/**
 * omap_device_disable_clocks - disable all main and interface clocks
 * @od: struct omap_device *od
 *
 * Disable the main functional clock and interface clock for all of the
 * omap_hwmods associated with the omap_device.  Returns 0.
 */
int omap_device_disable_clocks(struct omap_device *od)
{
      int i;

      for (i = 0; i < od->hwmods_cnt; i++)
            omap_hwmod_disable_clocks(od->hwmods[i]);

      /* XXX pass along return value here? */
      return 0;
}

/**
 * omap_device_enable_clocks - enable all main and interface clocks
 * @od: struct omap_device *od
 *
 * Enable the main functional clock and interface clock for all of the
 * omap_hwmods associated with the omap_device.  Returns 0.
 */
int omap_device_enable_clocks(struct omap_device *od)
{
      int i;

      for (i = 0; i < od->hwmods_cnt; i++)
            omap_hwmod_enable_clocks(od->hwmods[i]);

      /* XXX pass along return value here? */
      return 0;
}

struct device omap_device_parent = {
      .init_name  = "omap",
      .parent         = &platform_bus,
};

static int __init omap_device_init(void)
{
      return device_register(&omap_device_parent);
}
core_initcall(omap_device_init);

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