ichsmb(4), tco(4): Add support for TCO on newer Intel chipsets.

TCO (`Total Cost of Ownership', Intel's bizarre name for a watchdog
timer) used to hang off the Intel I/O platform controller hub's (ICH)
low-pin-count interface bridge (LPC IB), or ichlpcib(4). On newer
devices, it hangs off the ICH SMBus instead.

Tested on INTEL 100SERIES_SMB (works) and INTEL 100SERIES_LP_SMB
(doesn't work, still not sure why).

XXX kernel revbump: This breaks the module ABI -- tco(4) modules
older than the change to make ta_has_rcba into ta_version will
incorrectly attach at buses they do not understand. (However, the
tco(4) driver is statically built into GENERIC, so maybe it's safe
for pullup since the module wouldn't have worked anyway.)

tco(4): Nix PMC_TCO_BASE offset in TCO register definitions.

This just uses a subregion with PMC_TCO_BASE automatically applied.

No functional change intended.

tco(4): Use a subregion of the PMC registers for TCO registers.

This is an intermediate step that will let us decouple it from access
via PMBASE.

ichlpcib(4), tco(4): Rename iot -> pmt, ioh -> pmh.

Makes it clearer that this is specifically about the power management
controller (PMC) registers relative to PMBASE.

ichlpcib(4), tco(4): Take `lpcib_' off various names.

For PMC-specific ones, change `lpcib_' to `pmc_'. These are in a
separate PCI device in newer chipsets.

For TCO-specific ones, which may live in different places, whether at
their own base address or as an offset from PMBASE, just leave it as
`tco_' or `tcotimer'.

No functional change intended.

tco(4): Rename lpcib_tco_attach_args -> tco_attach_args.

No longer hangs off LPC bus, newer devices hang it off SMBus.

tco(4): Change has_rcba bit into version number.

Will be useful for newer Intel platform controller hubs.

No functional change intended. Module ABI is unchanged, although older
modules will do something nonseneical when confronted with versions
above 1 -- that will require a revbump (but with any luck, it will make
life easier for versions above 2 easier once we do that).

tco(4): Fix whitespace. No functional change intended.

branches: 1.2.16;
print the configuration information early so that it does not get intermingled
with possible error prints.

branches: 1.1.2;
Separate the watchdog code from the pcib code, and make the watchdog
a loadable module.

tco(4): Nix PMC_TCO_BASE offset in TCO register definitions.

This just uses a subregion with PMC_TCO_BASE automatically applied.

No functional change intended.

tco(4): Use a subregion of the PMC registers for TCO registers.

This is an intermediate step that will let us decouple it from access
via PMBASE.

ichlpcib(4), tco(4): Rename iot -> pmt, ioh -> pmh.

Makes it clearer that this is specifically about the power management
controller (PMC) registers relative to PMBASE.

ichlpcib(4), tco(4): Take `lpcib_' off various names.

For PMC-specific ones, change `lpcib_' to `pmc_'. These are in a
separate PCI device in newer chipsets.

For TCO-specific ones, which may live in different places, whether at
their own base address or as an offset from PMBASE, just leave it as
`tco_' or `tcotimer'.

No functional change intended.

tco(4): Rename lpcib_tco_attach_args -> tco_attach_args.

No longer hangs off LPC bus, newer devices hang it off SMBus.

tco(4): Change has_rcba bit into version number.

Will be useful for newer Intel platform controller hubs.

No functional change intended. Module ABI is unchanged, although older
modules will do something nonseneical when confronted with versions
above 1 -- that will require a revbump (but with any luck, it will make
life easier for versions above 2 easier once we do that).

tco(4): Fix whitespace. No functional change intended.

branches: 1.2.16;
print the configuration information early so that it does not get intermingled
with possible error prints.

branches: 1.1.2;
Separate the watchdog code from the pcib code, and make the watchdog
a loadable module.

tco(4): Nix PMC_TCO_BASE offset in TCO register definitions.

This just uses a subregion with PMC_TCO_BASE automatically applied.

No functional change intended.

tco(4): Use a subregion of the PMC registers for TCO registers.

This is an intermediate step that will let us decouple it from access
via PMBASE.

ichlpcib(4), tco(4): Rename iot -> pmt, ioh -> pmh.

Makes it clearer that this is specifically about the power management
controller (PMC) registers relative to PMBASE.

ichlpcib(4), tco(4): Take `lpcib_' off various names.

For PMC-specific ones, change `lpcib_' to `pmc_'. These are in a
separate PCI device in newer chipsets.

For TCO-specific ones, which may live in different places, whether at
their own base address or as an offset from PMBASE, just leave it as
`tco_' or `tcotimer'.

No functional change intended.

tco(4): Rename lpcib_tco_attach_args -> tco_attach_args.

No longer hangs off LPC bus, newer devices hang it off SMBus.

tco(4): Change has_rcba bit into version number.

Will be useful for newer Intel platform controller hubs.

No functional change intended. Module ABI is unchanged, although older
modules will do something nonseneical when confronted with versions
above 1 -- that will require a revbump (but with any luck, it will make
life easier for versions above 2 easier once we do that).

tco(4): Fix whitespace. No functional change intended.

branches: 1.2.16;
print the configuration information early so that it does not get intermingled
with possible error prints.

branches: 1.1.2;
Separate the watchdog code from the pcib code, and make the watchdog
a loadable module.