1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c b/drivers/gpu/drm/exynos/exynos_drm_dma.c
new file mode 100644
index 000000000000..f01cb102956d
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2012 Samsung Electronics Co., Ltd.
+// Author: Andrzej Hajda <a.hajda@samsung.com>
+
+#include "exynos_drm_drv.h"
+#include "exynos_drm_iommu.h"
+
+int exynos_drm_register_dma(struct drm_device *drm, struct device *dev)
+{
+	struct exynos_drm_private *priv = drm->dev_private;
+	int ret;
+
+	if (!priv->dma_dev) {
+		priv->dma_dev = dev;
+		DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
+			 dev_name(dev));
+		/* create common IOMMU mapping for all Exynos DRM devices */
+		ret = drm_create_iommu_mapping(drm);
+		if (ret < 0) {
+			priv->dma_dev = NULL;
+			DRM_ERROR("failed to create iommu mapping.\n");
+			return -EINVAL;
+		}
+	}
+
+	return drm_iommu_attach_device(drm, dev);
+}
+
+void exynos_drm_unregister_dma(struct drm_device *drm, struct device *dev)
+{
+	if (IS_ENABLED(CONFIG_EXYNOS_IOMMU))
+		drm_iommu_detach_device(drm, dev);
+}
+
+void exynos_drm_cleanup_dma(struct drm_device *drm)
+{
+	if (IS_ENABLED(CONFIG_EXYNOS_IOMMU))
+		drm_release_iommu_mapping(drm);
+}