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iommu: Add DMA mapping operations

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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>
This commit is contained in:
Mark Kettenis 2023-01-21 20:27:52 +01:00 • committed by Tom Rini
parent 053827b3c3
commit dd6b68ed4f
3 changed files with 56 additions and 0 deletions
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24
include/iommu.h
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@ -3,6 +3,27 @@
struct udevice;
struct iommu_ops {
/**
* map() - map DMA memory
*
* @dev: device for which to map DMA memory
* @addr: CPU address of the memory
* @size: size of the memory
* @return DMA address for the device
*/
dma_addr_t (*map)(struct udevice *dev, void *addr, size_t size);
/**
* unmap() - unmap DMA memory
*
* @dev: device for which to unmap DMA memory
* @addr: DMA address of the memory
* @size: size of the memory
*/
void (*unmap)(struct udevice *dev, dma_addr_t addr, size_t size);
};
#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
CONFIG_IS_ENABLED(IOMMU)
int dev_iommu_enable(struct udevice *dev);
@ -13,4 +34,7 @@ static inline int dev_iommu_enable(struct udevice *dev)
}
#endif
dma_addr_t dev_iommu_dma_map(struct udevice *dev, void *addr, size_t size);
void dev_iommu_dma_unmap(struct udevice *dev, dma_addr_t addr, size_t size);
#endif