mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
d81aecb5e6
This patch changes file license to GPL Most of exynos files had been copied from some random file and not updated correctly. So this patch corrects the file license. Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/* 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 <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 <linux/kref.h>
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#include <asm/dma-iommu.h>
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#include "exynos_drm_drv.h"
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#include "exynos_drm_iommu.h"
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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 dma_iommu_mapping *mapping = NULL;
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struct exynos_drm_private *priv = drm_dev->dev_private;
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struct device *dev = drm_dev->dev;
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if (!priv->da_start)
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priv->da_start = EXYNOS_DEV_ADDR_START;
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if (!priv->da_space_size)
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priv->da_space_size = EXYNOS_DEV_ADDR_SIZE;
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if (!priv->da_space_order)
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priv->da_space_order = EXYNOS_DEV_ADDR_ORDER;
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mapping = arm_iommu_create_mapping(&platform_bus_type, priv->da_start,
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priv->da_space_size,
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priv->da_space_order);
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if (IS_ERR(mapping))
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return PTR_ERR(mapping);
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dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
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GFP_KERNEL);
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dma_set_max_seg_size(dev, 0xffffffffu);
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dev->archdata.mapping = mapping;
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return 0;
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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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* if mapping->kref becomes 0 then all things related to iommu mapping
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* will be released
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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 device *dev = drm_dev->dev;
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arm_iommu_release_mapping(dev->archdata.mapping);
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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 device *dev = drm_dev->dev;
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int ret;
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if (!dev->archdata.mapping) {
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DRM_ERROR("iommu_mapping is null.\n");
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return -EFAULT;
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}
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subdrv_dev->dma_parms = devm_kzalloc(subdrv_dev,
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sizeof(*subdrv_dev->dma_parms),
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GFP_KERNEL);
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dma_set_max_seg_size(subdrv_dev, 0xffffffffu);
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ret = arm_iommu_attach_device(subdrv_dev, dev->archdata.mapping);
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if (ret < 0) {
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DRM_DEBUG_KMS("failed iommu attach.\n");
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return ret;
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}
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/*
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* Set dma_ops to drm_device just one time.
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*
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* The dma mapping api needs device object and the api is used
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* to allocate physial memory and map it with iommu table.
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* If iommu attach succeeded, the sub driver would have dma_ops
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* for iommu and also all sub drivers have same dma_ops.
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*/
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if (!dev->archdata.dma_ops)
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dev->archdata.dma_ops = subdrv_dev->archdata.dma_ops;
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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 device *dev = drm_dev->dev;
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struct dma_iommu_mapping *mapping = dev->archdata.mapping;
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if (!mapping || !mapping->domain)
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return;
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iommu_detach_device(mapping->domain, subdrv_dev);
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drm_release_iommu_mapping(drm_dev);
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}
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