示例#1
0
/**
 * 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_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 = to_omap_device(pdev);

	if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
		dev_warn(&pdev->dev,
			 "omap_device: %s() called from invalid state %d\n",
			 __func__, od->_state);
		return -EINVAL;
	}

	ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);

	od->_state = OMAP_DEVICE_STATE_IDLE;

	return ret;
}
示例#3
0
/**
 * 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;
}
示例#4
0
/**
 * 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;
}