112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
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/* exynos_drm_iommu.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* Author: Inki Dae <inki.dae@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <drm/drmP.h>
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#include <drm/exynos_drm.h>
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#include <linux/dma-mapping.h>
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#include <linux/iommu.h>
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#include "exynos_drm_drv.h"
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#include "exynos_drm_iommu.h"
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static inline int configure_dma_max_seg_size(struct device *dev)
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{
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if (!dev->dma_parms)
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dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL);
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if (!dev->dma_parms)
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return -ENOMEM;
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dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
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return 0;
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}
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static inline void clear_dma_max_seg_size(struct device *dev)
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{
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kfree(dev->dma_parms);
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dev->dma_parms = NULL;
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}
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/*
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* drm_create_iommu_mapping - create a mapping structure
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*
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* @drm_dev: DRM device
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*/
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int drm_create_iommu_mapping(struct drm_device *drm_dev)
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{
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struct exynos_drm_private *priv = drm_dev->dev_private;
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return __exynos_iommu_create_mapping(priv, EXYNOS_DEV_ADDR_START,
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EXYNOS_DEV_ADDR_SIZE);
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}
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/*
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* drm_release_iommu_mapping - release iommu mapping structure
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*
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* @drm_dev: DRM device
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*/
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void drm_release_iommu_mapping(struct drm_device *drm_dev)
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{
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struct exynos_drm_private *priv = drm_dev->dev_private;
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__exynos_iommu_release_mapping(priv);
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}
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/*
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* drm_iommu_attach_device- attach device to iommu mapping
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*
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* @drm_dev: DRM device
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* @subdrv_dev: device to be attach
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*
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* This function should be called by sub drivers to attach it to iommu
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* mapping.
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*/
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int drm_iommu_attach_device(struct drm_device *drm_dev,
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struct device *subdrv_dev)
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{
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struct exynos_drm_private *priv = drm_dev->dev_private;
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int ret;
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if (get_dma_ops(priv->dma_dev) != get_dma_ops(subdrv_dev)) {
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DRM_ERROR("Device %s lacks support for IOMMU\n",
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dev_name(subdrv_dev));
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return -EINVAL;
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}
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ret = configure_dma_max_seg_size(subdrv_dev);
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if (ret)
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return ret;
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ret = __exynos_iommu_attach(priv, subdrv_dev);
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if (ret)
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clear_dma_max_seg_size(subdrv_dev);
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return 0;
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}
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/*
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* drm_iommu_detach_device -detach device address space mapping from device
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*
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* @drm_dev: DRM device
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* @subdrv_dev: device to be detached
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*
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* This function should be called by sub drivers to detach it from iommu
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* mapping
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*/
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void drm_iommu_detach_device(struct drm_device *drm_dev,
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struct device *subdrv_dev)
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{
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struct exynos_drm_private *priv = drm_dev->dev_private;
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__exynos_iommu_detach(priv, subdrv_dev);
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clear_dma_max_seg_size(subdrv_dev);
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}
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