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

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

Remove unused bhndb_devclass.

bhnd(4): Remove some double words in source code comments

- s/be be/be/
- s/is is/is/

MFC after: 3 days

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

bhndb(4): Implement bridge support for the BCM4312 and other PCI_V0 chipsets.

Very early (PCI_V0) Broadcom PCI Wi-Fi chipsets have a few quirks when
compared to later PCI(e) core revisions:

- The standard static BAR0 mapping of the PCI core registers is discontiguous,
with siba's cfg0 register block mapped distinctly from the other core
registers.
- No dedicated ChipCommon register mapping is provided; instead, the
single configurable register window must be used to access both
ChipCommon and D11 core registers. The D11 core's operational semantics
guarantee the safety of -- after disabling interrupts -- borrowing
the single dynamic register window to perform the few ChipCommon
operations required by a driver.

To support these early PCI devices:

- Allow defining multiple discontiguous BHNDB_REGWIN_T_CORE register
windows that map a single port/region, and producing bridged resource
allocations backed by those discontiguous windows.
- Support stealing existing register window allocations to fulfill indirect
bhnd(4) bus I/O requests within address ranges tagged with
BHNDB_ALLOC_FULFILL_ON_OVERCOMMIT.
- Fix an inverted test of bhndb_is_pcie_attached() that disabled
PCI-only clock bring-up required by these devices.

Approved by: adrian (mentor, implicit)
Sponsored by: The FreeBSD Foundation

bhnd(4): Add support for querying DMA address translation parameters

BHND Wi-Fi chipsets and SoCs share a common DMA engine, operating within
backplane address space. To support host DMA on Wi-Fi chipsets, the bridge
core maps host address space onto the backplane; any host addresses must
be translated to their corresponding backplane address.


- Defines a new bhnd_get_dma_translation(9) API to support querying DMA
address translation parameters from the bhnd(4) bus.
- Extends bhndb(4) to provide DMA translation descriptors from a DMA
address translation table defined in the host bridge-specific
bhndb_hwcfg.
- Defines bhndb(4) DMA address translation tables for all supported host
bridge cores.
- Extends mips/broadcom's bhnd_nexus driver to return an identity (no-op)
DMA translation descriptor; no translation is required when addressing
the SoC backplane.

Approved by: adrian (mentor)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D12582

[bhnd] Add support for querying the attachment type of the bhnd bus.

This adds a BHND_BUS_GET_ATTACH_TYPE(); the primary use-case is to let
chipc make a coarse-grained determination as to whether UART, SPI, etc
drivers ought to be attached, and on fullmac devices, whether a real
CPU driver ought to be skipped for the ARM core, etc.

Tested:

* BCM4331 (BHND)
* BCM4312 (SIBA)

Submitted by: Landon Fuller <landonf@landonf.org>
Differential Revision: https://reviews.freebsd.org/D6492

[bhnd] don't use anonymous unions.

Found by: gcc-4.2

Bring over the initial rewrite of the broadcom bus support found in their
SoCs and various chips (including, famously, their wifi chips.)

This is "just" (all 20,000 lines of it) code to enumerate the various
versions of busses inside these devices, including the PCI bridge and
the direct SIBA bridge found in MIPS chips.

It also includes shared code for some bus operations (suspend, resume, etc);
EEPROM/SROM/etc parsing and other things that are shared between chips.

Eventually this'll replace the code that bwi/bwn uses for the internal
bus, as well as some apparently upcoming mips74k broadcom SoC support
which uses bwn!

Thanks to Landon Fuller <landonf@landonf.org> for all this work!

Obtained from: https://github.com/landonf/freebsd/compare/user/landonf/bcm4331-CURRENT