80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* Copyright (C) 2015 Samsung Electronics Co.Ltd
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* Authors: Marek Szyprowski <m.szyprowski@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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#ifndef S5P_MFC_IOMMU_H_
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#define S5P_MFC_IOMMU_H_
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#define S5P_MFC_IOMMU_DMA_BASE 0x20000000lu
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#define S5P_MFC_IOMMU_DMA_SIZE SZ_256M
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#if defined(CONFIG_EXYNOS_IOMMU) && defined(CONFIG_ARM_DMA_USE_IOMMU)
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#include <asm/dma-iommu.h>
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static inline bool exynos_is_iommu_available(struct device *dev)
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{
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return dev->archdata.iommu != NULL;
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}
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static inline void exynos_unconfigure_iommu(struct device *dev)
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{
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struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
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arm_iommu_detach_device(dev);
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arm_iommu_release_mapping(mapping);
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}
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static inline int exynos_configure_iommu(struct device *dev,
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unsigned int base, unsigned int size)
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{
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struct dma_iommu_mapping *mapping = NULL;
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int ret;
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/* Disable the default mapping created by device core */
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if (to_dma_iommu_mapping(dev))
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exynos_unconfigure_iommu(dev);
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mapping = arm_iommu_create_mapping(dev->bus, base, size);
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if (IS_ERR(mapping)) {
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pr_warn("Failed to create IOMMU mapping for device %s\n",
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dev_name(dev));
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return PTR_ERR(mapping);
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}
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ret = arm_iommu_attach_device(dev, mapping);
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if (ret) {
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pr_warn("Failed to attached device %s to IOMMU_mapping\n",
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dev_name(dev));
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arm_iommu_release_mapping(mapping);
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return ret;
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}
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return 0;
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}
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#else
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static inline bool exynos_is_iommu_available(struct device *dev)
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{
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return false;
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}
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static inline int exynos_configure_iommu(struct device *dev,
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unsigned int base, unsigned int size)
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{
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return -ENOSYS;
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}
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static inline void exynos_unconfigure_iommu(struct device *dev) { }
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#endif
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#endif /* S5P_MFC_IOMMU_H_ */
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