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This uclass is intended to manage IOMMUs on systems where the IOMMUs are not in bypass mode by default. In that case U-Boot cannot ignore the IOMMUs if it wants to use devices that need to do DMA and sit behind such an IOMMU. This initial IOMMU uclass implementation does not implement and device ops and is intended for IOMMUs that have a bypass mode that does not require address translation. Support for IOMMUs that do require address translation is planned and device ops will be defined when support for such IOMMUs will be added. Signed-off-by: Mark Kettenis <kettenis@openbsd.org> Reviewed-by: Simon Glass <sjg@chromium.org>
17 lines
403 B
Text
17 lines
403 B
Text
#
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# IOMMU devices
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#
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menu "IOMMU device drivers"
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config IOMMU
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bool "Enable Driver Model for IOMMU drivers"
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depends on DM
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help
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Enable driver model for IOMMU devices. An IOMMU maps device
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virtiual memory addresses to physical addresses. Devices
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that sit behind an IOMMU can typically only access physical
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memory if the IOMMU has been programmed to allow access to
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that memory.
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endmenu
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