On Sat, 23 Oct 2021 at 08:58, Mark Kettenis kettenis@openbsd.org wrote:
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
ChangeLog:
v4: - Copy generic IOMMU DT bindings from Linux - Explain IOMMU KConfig option - Rename dev_iommu_probe()
doc/device-tree-bindings/iommu/iommu.txt | 206 +++++++++++++++++++++++ drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/core/device.c | 8 + drivers/iommu/Kconfig | 17 ++ drivers/iommu/Makefile | 3 + drivers/iommu/iommu-uclass.c | 45 +++++ include/dm/uclass-id.h | 1 + include/iommu.h | 16 ++ 9 files changed, 299 insertions(+) create mode 100644 doc/device-tree-bindings/iommu/iommu.txt create mode 100644 drivers/iommu/Kconfig create mode 100644 drivers/iommu/Makefile create mode 100644 drivers/iommu/iommu-uclass.c create mode 100644 include/iommu.h
Reviewed-by: Simon Glass sjg@chromium.org