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/* 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);
}
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