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)

Add some missing DFS chipset functionality to the FreeBSD HAL.

Please note - this doesn't in any way constitute a full DFS
implementation, it merely adds the relevant capability bits and
radar detection threshold register access.

The particulars:

* Add new capability bits outlining what the DFS capabilities
are of the various chipsets.
* Add HAL methods to set and get the radar related register values.
* Add AR5212 and AR5416+ DFS radar related register value
routines.
* Add a missing HAL phy error code that's related to radar event
processing.
* Add HAL_PHYERR_PARAM, a data type that encapsulates the radar
register values.

The AR5212 routines are just for completeness. The AR5416 routines
are a super-set of those; I may later on do a drive-by pass to
tidy up duplicate code.

Obtained from: Linux, Atheros

Bring over my AR9287 work in progress.

It isn't linked into the build because it's missing the TX power
and PDADC programming code.

This code is mostly based on the ath9k codebase, compared against
the Atheros codebase as appropriate.

What's implemented:

* probe/attach
* EEPROM board value programming
* RX initial calibration
* radio channel programming
* general MAC / baseband setup
* async fifo setup
* open-loop tx power calibration

What's missing before it can be enabled by default:

* TX power / calibration setting code
* closed-loop tx power calibration routines
* TSF2 handling
* generic timer support from ath9k

Obtained from: Atheros, ath9k

When disabling RIFS for Sowl (AR9160) and Howl (AR9130), make sure RIFS
is totally disabled.

The Atheros HAL code does this for Sowl/Howl but not for Owl (AR5416) where
RIFS is disabled by default.

This seems to quieten the occasional baseband hang I've been seeing with
the AR9160 in STA mode under constant heavy traffic load.

Obtained from: Atheros

Update the ext channel cycpwr threshold 1 register for the extension
channel when the channel is HT/40.

The new ANI code (primarily for the AR9300/AR9400) in ath9k sets this
register but the ANI code for the previous 11n chips didn't set this.

Unlike ath9k, only set this for HT/40 channels.

Obtained From: ath9k

Add in some AR9280 specific board configuration options.

* The existing radio config code was for the AR5416/AR9160 and missed out
on some of the AR9280 specific stuff. Include said stuff from ath9k.

* Refactor out the gain control settings into a new function, again pilfered
from ath9k.

* Use the analog register RMW macro when touching analog registers.

Obtained from: Linux ath9k

Bring over some NF calibration changes from ath9k.

Each different radio chipset has a different "good" range of CCA
(clear channel access) parameters where, if you write something
out of range, it's possible the radio will go deaf.

Also, since apparently occasionally reading the NF calibration
returns "wrong" values, so enforce those limits on what is being
written into the CCA register.

Write a default value if there's no history available.

This isn't the case right now but it may be later on when "off-channel"
scanning occurs without init'ing or changing the NF history buffer.
(As each channel may have a different noise floor; so scanning or
other off-channel activity shouldn't affect the NF history of
the current channel.)

Bring in a couple of fixes from the Linux ath9k related to chip hangs.
While there, try to make the register write pattern look like what's
done by ath9k.

MFC after: 3 days

Fix TX power problems with AR9285.

Add support for the AR9285 chipset, which is found on many netbooks
available today.

This card is a low power 802.11bgn that only does 11n rates up to MCS 7
(that's 65 Mbps in 20Mhz mode and 135 in 40Mhz mode).
802.11n is not yet supported, but will be in the future.

The driver still has a problem regarding to the setting of txpower on
the card, so don't expect good performance yet. After fixing this
problem, an MFC is possible.

Special thanks to iXsystems and S Smirnov <tonve at yandex.ru> for help
with the purchase of a netbook with this card.

Sponsored by: iXsystems, Inc.

add FreeBSD property

import ath hal

Update to later code from my repository:
o many bug fixes
o add new periodic calibration api
o break up 5416 periodic calibration code in preparation for 928x
o move get noise floor to rf backends
o 5416-specific ani (still disabled)
o modularize 5210 eeprom format a la other eeprom formats
o start cleaning up regdomain code
o prepare for proper 1/2 and 1/4 width channel support
o bring back 900MHz card support
o clean up 5212 rf version handling
o add 1/2 and 1/4 width channel support for 5212 parts
o split 5212 rfgain handling out
o improve ani debugging
o add AH_USE_INIPDGAIN compile option
o purge a bunch of dead 5212 state
o add 1/2 and 1/4 rate modes
o remove HAL_CAP_CHAN_HALFRATE and HAL_CAP_CHAN_QUARTERRATE; the
same info can now be deduced from the set of supported modes

virgin import of ath hal