41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (c) 2012 Samsung Electronics Co., Ltd.
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// Author: Andrzej Hajda <a.hajda@samsung.com>
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#include "exynos_drm_drv.h"
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#include "exynos_drm_iommu.h"
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int exynos_drm_register_dma(struct drm_device *drm, struct device *dev)
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{
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struct exynos_drm_private *priv = drm->dev_private;
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int ret;
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if (!priv->dma_dev) {
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priv->dma_dev = dev;
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DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
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dev_name(dev));
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/* create common IOMMU mapping for all Exynos DRM devices */
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ret = drm_create_iommu_mapping(drm);
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if (ret < 0) {
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priv->dma_dev = NULL;
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DRM_ERROR("failed to create iommu mapping.\n");
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return -EINVAL;
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}
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}
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return drm_iommu_attach_device(drm, dev);
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}
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void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev)
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{
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if (IS_ENABLED(CONFIG_EXYNOS_IOMMU))
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drm_iommu_detach_device(drm, dev);
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}
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void exynos_drm_cleanup_dma(struct drm_device *drm)
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{
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if (IS_ENABLED(CONFIG_EXYNOS_IOMMU))
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drm_release_iommu_mapping(drm);
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}
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