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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 <drmP.h>
- #include <drm/exynos_drm.h>
- #include <linux/dma-mapping.h>
- #include <linux/iommu.h>
- #include <linux/kref.h>
- #include <asm/dma-iommu.h>
- #include "exynos_drm_drv.h"
- #include "exynos_drm_iommu.h"
- /*
- * drm_create_iommu_mapping - create a mapping structure
- *
- * @drm_dev: DRM device
- */
- int drm_create_iommu_mapping(struct drm_device *drm_dev)
- {
- struct dma_iommu_mapping *mapping = NULL;
- struct exynos_drm_private *priv = drm_dev->dev_private;
- struct device *dev = drm_dev->dev;
- if (!priv->da_start)
- priv->da_start = EXYNOS_DEV_ADDR_START;
- if (!priv->da_space_size)
- priv->da_space_size = EXYNOS_DEV_ADDR_SIZE;
- mapping = arm_iommu_create_mapping(&platform_bus_type, priv->da_start,
- priv->da_space_size);
- if (IS_ERR(mapping))
- return PTR_ERR(mapping);
- dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
- GFP_KERNEL);
- if (!dev->dma_parms)
- goto error;
- dma_set_max_seg_size(dev, 0xffffffffu);
- dev->archdata.mapping = mapping;
- return 0;
- error:
- arm_iommu_release_mapping(mapping);
- return -ENOMEM;
- }
- /*
- * drm_release_iommu_mapping - release iommu mapping structure
- *
- * @drm_dev: DRM device
- *
- * if mapping->kref becomes 0 then all things related to iommu mapping
- * will be released
- */
- void drm_release_iommu_mapping(struct drm_device *drm_dev)
- {
- struct device *dev = drm_dev->dev;
- arm_iommu_release_mapping(dev->archdata.mapping);
- }
- /*
- * 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 device *dev = drm_dev->dev;
- int ret;
- if (!dev->archdata.mapping)
- return 0;
- subdrv_dev->dma_parms = devm_kzalloc(subdrv_dev,
- sizeof(*subdrv_dev->dma_parms),
- GFP_KERNEL);
- if (!subdrv_dev->dma_parms)
- return -ENOMEM;
- dma_set_max_seg_size(subdrv_dev, 0xffffffffu);
- if (subdrv_dev->archdata.mapping)
- arm_iommu_detach_device(subdrv_dev);
- ret = arm_iommu_attach_device(subdrv_dev, dev->archdata.mapping);
- if (ret < 0) {
- DRM_DEBUG_KMS("failed iommu attach.\n");
- return ret;
- }
- /*
- * Set dma_ops to drm_device just one time.
- *
- * The dma mapping api needs device object and the api is used
- * to allocate physial memory and map it with iommu table.
- * If iommu attach succeeded, the sub driver would have dma_ops
- * for iommu and also all sub drivers have same dma_ops.
- */
- if (get_dma_ops(dev) == get_dma_ops(NULL))
- set_dma_ops(dev, get_dma_ops(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 device *dev = drm_dev->dev;
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
- if (!mapping || !mapping->domain)
- return;
- arm_iommu_detach_device(subdrv_dev);
- }
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