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pci_dw: Support modern "unroll" iATU mode

Description

pci_dw: Support modern "unroll" iATU mode

This supersedes the old legacy mode where a viewport register was used
to mux multiple regions behind a single set of registers, and is used on
the SiFive FU740.

Reviewed by: mmel
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31029

(cherry picked from commit f240dfff229d1f1ff502f59901ef2b9364ca55d9)

Details

Provenance
jrtc27Authored on Jul 21 2021, 4:50 AM
Reviewer
mmel
Differential Revision
D31029: pci_dw: Support modern "unroll" iATU mode
Parents
rG982d709cdc25: pci_dw: Support multiple memory windows
Branches
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