sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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pci_dw: Detect number of outbound regions automatically

Currently we use the num-viewports property to decide how many outbound
regions there are we can use, defaulting to 2. However, Linux has
stop

pci_dw: Detect number of outbound regions automatically

Currently we use the num-viewports property to decide how many outbound
regions there are we can use, defaulting to 2. However, Linux has
stopped using that and so it no longer appears in new device trees, such
as for the SiFive FU740. Instead, it's possible to just probe the
hardware directly.

Reviewed by: mmel
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31030

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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 F

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

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pci_dw: Support multiple memory windows

Currently we assume there is only one memory and one prefetch memory
window, and ignore the latter. However, the SiFive FU740 has two normal
memory windows.

pci_dw: Support multiple memory windows

Currently we assume there is only one memory and one prefetch memory
window, and ignore the latter. However, the SiFive FU740 has two normal
memory windows.

As part of this, the viewports are rearranged. Previously the viewports
were memory, config then optionally I/O. Both to simplify the config
index calculation and to ensure it can always be mapped even if we have
too many memory windows for the number of viewports, config is moved to
being the first viewport.

This generalisation now also naturally supports mapping prefetch memory
windows.

Reviewed by: mmel
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31028

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pci: clean up empty lines in .c and .h files

Add driver for DesignWare PCIE core, and its Armada 8K specific attachement.

MFC after: 3 weeks