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iommu: Add IOMMU uclass

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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>
This commit is contained in:
Mark Kettenis 2021-10-23 16:58:01 +02:00 • committed by Tom Rini
parent d73db30427
commit 40dbf03d7d
9 changed files with 299 additions and 0 deletions
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16
include/iommu.h Normal file
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@ -0,0 +1,16 @@
#ifndef _IOMMU_H
#define _IOMMU_H
struct udevice;
#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
CONFIG_IS_ENABLED(IOMMU)
int dev_iommu_enable(struct udevice *dev);
#else
static inline int dev_iommu_enable(struct udevice *dev)
{
return 0;
}
#endif
#endif