linux-imx

/**

 * \file drm_dma.c

 * DMA IOCTL and function support

 *

 * \author Rickard E. (Rik) Faith <faith@valinux.com>

 * \author Gareth Hughes <gareth@valinux.com>

 */

​

/*

 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com

 *

 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.

 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 */

​

#include <linux/export.h>

#include <drm/drmP.h>

#include "drm_legacy.h"

​

/**

 * Initialize the DMA data.

 *

 * \param dev DRM device.

 * \return zero on success or a negative value on failure.

 *

 * Allocate and initialize a drm_device_dma structure.

 */

int drm_legacy_dma_setup(struct drm_device *dev)

{

    int i;

​

    if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||

        !drm_core_check_feature(dev, DRIVER_LEGACY))

        return 0;

​

    dev->buf_use = 0;

    atomic_set(&dev->buf_alloc, 0);

​

    dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);

    if (!dev->dma)

        return -ENOMEM;

​

    for (i = 0; i <= DRM_MAX_ORDER; i++)