You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
2.6 KiB
111 lines
2.6 KiB
/* exynos_drm_iommu.c
|
|
*
|
|
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
|
|
* Author: Inki Dae <inki.dae@samsung.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <drm/drmP.h>
|
|
#include <drm/exynos_drm.h>
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/iommu.h>
|
|
|
|
#include "exynos_drm_drv.h"
|
|
#include "exynos_drm_iommu.h"
|
|
|
|
static inline int configure_dma_max_seg_size(struct device *dev)
|
|
{
|
|
if (!dev->dma_parms)
|
|
dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL);
|
|
if (!dev->dma_parms)
|
|
return -ENOMEM;
|
|
|
|
dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
|
|
return 0;
|
|
}
|
|
|
|
static inline void clear_dma_max_seg_size(struct device *dev)
|
|
{
|
|
kfree(dev->dma_parms);
|
|
dev->dma_parms = NULL;
|
|
}
|
|
|
|
/*
|
|
* drm_create_iommu_mapping - create a mapping structure
|
|
*
|
|
* @drm_dev: DRM device
|
|
*/
|
|
int drm_create_iommu_mapping(struct drm_device *drm_dev)
|
|
{
|
|
struct exynos_drm_private *priv = drm_dev->dev_private;
|
|
|
|
return __exynos_iommu_create_mapping(priv, EXYNOS_DEV_ADDR_START,
|
|
EXYNOS_DEV_ADDR_SIZE);
|
|
}
|
|
|
|
/*
|
|
* drm_release_iommu_mapping - release iommu mapping structure
|
|
*
|
|
* @drm_dev: DRM device
|
|
*/
|
|
void drm_release_iommu_mapping(struct drm_device *drm_dev)
|
|
{
|
|
struct exynos_drm_private *priv = drm_dev->dev_private;
|
|
|
|
__exynos_iommu_release_mapping(priv);
|
|
}
|
|
|
|
/*
|
|
* drm_iommu_attach_device- attach device to iommu mapping
|
|
*
|
|
* @drm_dev: DRM device
|
|
* @subdrv_dev: device to be attach
|
|
*
|
|
* This function should be called by sub drivers to attach it to iommu
|
|
* mapping.
|
|
*/
|
|
int drm_iommu_attach_device(struct drm_device *drm_dev,
|
|
struct device *subdrv_dev)
|
|
{
|
|
struct exynos_drm_private *priv = drm_dev->dev_private;
|
|
int ret;
|
|
|
|
if (get_dma_ops(priv->dma_dev) != get_dma_ops(subdrv_dev)) {
|
|
DRM_ERROR("Device %s lacks support for IOMMU\n",
|
|
dev_name(subdrv_dev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = configure_dma_max_seg_size(subdrv_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = __exynos_iommu_attach(priv, subdrv_dev);
|
|
if (ret)
|
|
clear_dma_max_seg_size(subdrv_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* drm_iommu_detach_device -detach device address space mapping from device
|
|
*
|
|
* @drm_dev: DRM device
|
|
* @subdrv_dev: device to be detached
|
|
*
|
|
* This function should be called by sub drivers to detach it from iommu
|
|
* mapping
|
|
*/
|
|
void drm_iommu_detach_device(struct drm_device *drm_dev,
|
|
struct device *subdrv_dev)
|
|
{
|
|
struct exynos_drm_private *priv = drm_dev->dev_private;
|
|
|
|
__exynos_iommu_detach(priv, subdrv_dev);
|
|
clear_dma_max_seg_size(subdrv_dev);
|
|
}
|
|
|