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In order to support IOMMUs in non-bypass mode we need device ops to map and unmap DMA memory. The map operation enters a mapping for a region specified by CPU address and size into the translation table of the IOMMU and returns a DMA address suitable for programming the device to do DMA. The unmap operation removes this mapping from the translation table of the IOMMU. Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
40 lines
951 B
C
40 lines
951 B
C
#ifndef _IOMMU_H
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#define _IOMMU_H
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struct udevice;
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struct iommu_ops {
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/**
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* map() - map DMA memory
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*
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* @dev: device for which to map DMA memory
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* @addr: CPU address of the memory
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* @size: size of the memory
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* @return DMA address for the device
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*/
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dma_addr_t (*map)(struct udevice *dev, void *addr, size_t size);
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/**
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* unmap() - unmap DMA memory
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*
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* @dev: device for which to unmap DMA memory
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* @addr: DMA address of the memory
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* @size: size of the memory
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*/
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void (*unmap)(struct udevice *dev, dma_addr_t addr, size_t size);
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};
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#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
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CONFIG_IS_ENABLED(IOMMU)
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int dev_iommu_enable(struct udevice *dev);
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#else
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static inline int dev_iommu_enable(struct udevice *dev)
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{
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return 0;
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}
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#endif
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dma_addr_t dev_iommu_dma_map(struct udevice *dev, void *addr, size_t size);
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void dev_iommu_dma_unmap(struct udevice *dev, dma_addr_t addr, size_t size);
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#endif
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