Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Remove unused ttys field.

Spotted by: Peter Jeremy <PeterJeremy@optushome.com.au>

Use generic tty code instead of local copies.

Introduce ttygone() which indicates that the hardware is detached.

Move dtrwait logic to the generic TTY level.

Remove the TIOCDCDTIMESTAMP option.

The RFC-2783 PPS-API (<sys/timepps.h>) provides better and more
configurable service.

Do the dreaded s/dev_t/struct cdev */
Bump __FreeBSD_version accordingly.

Consistently use the BSD u_int and u_short instead of the SYSV uint and
ushort. In most of these files, there was a mixture of both styles and
this change just makes them self-consistent.

Requested by: bde (kern_ktrace.c)

Don't use pessimal (u_short) types for i/o ports. This is mainly for
completenss. The pessimization is tiny compared with i/o port slowness
except on very old machines, but code that used signed short types for
i/o ports was unpessimized long ago, and the macro that detected it
recently started working for u_short types too. Use of bus space
should have made this moot long ago.

Not tested at runtime by: bde

Yet another adjustment of digi_delay(). The delay is now consistent
irrespective of whether tsleep() or DELAY() is used.

Change more uses of tsleep() to digi_delay() and make the loop counts more
sane.

Fix warnings. The driver would be more useful with a DRIVER_MODULE()
entry so that it actually can do something.

Staticise the con_bios and digi_devclass variables, since they aren't needed
by anything else.

devsw_add() and cdevsw_remove() are no longer needed.

Allow individual ports to use alternate pin settings (swap dsr & cd)
via the new DIGIIO_SETALTPIN ioctl, and allow the port's ALTPIN setting
to be queried via DIGIIO_GETALTPIN.

The initial state and lock devices are normally used to set and/or
lock ALTPIN settings although the device itself may also be used.

ALTPIN settings are applied per-device and apply to both the callin
and callout device at the same time.

Credit John Prince and Eric Hernes for their work.

digiModel_t -> enum digi_model
Remove a forgotton and unused structure.

Remove all the mutex stuff - suggested by jhb

Tidy up includes, credit Slawa Olhovchenkov, John Prince and Eric Hernes
for their efforts and add a couple of missing parenthesis around return
expressions.

Change COM_LOCK/COM_UNLOCK to a regular mutex - still conditional on
SMP being defined.

Only define DEBUG if it's undefined. This should eventually go, but
can stay for now in case of problems.

Add a ``digi'' driver.

This driver supports PCI Xr-based and ISA Xem Digiboard cards.
dgm will go away soon if there are no problems reported. For now,
configuring dgm into your kernel warns that you should be using
digi. This driver is probably close to supporting Xi, Xe and Xeve
cards, but I wouldn't expect them to work properly (hardware
donations welcome).

The digi_* pseudo-drivers are not drivers themselves but contain
the BIOS and FEP/OS binaries for various digiboard cards and are
auto-loaded and auto-unloaded by the digi driver at initialisation
time. They *may* be configured into the kernel, but waste a lot
of space if they are. They're intended to be left as modules.

The digictl program is (mainly) used to re-initialise cards that
have external port modules attached such as the PC/Xem.