Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

[ath_hal] reserve a HAL_TXDESC_ bit for azimuth TX timestamp requests.

Document the AR9285/AR9485 LNA configuration information that's
stored in the ctl/ext RSSI field for chain 2.

Tested:

* AR9285, STA

Implement STBC receive frame statistics.

The AR9280 and later can receive STBC. This adds some statistics
tracking to count these frames.

A patch to athstats will be forthcoming.

Extend the TX descriptor debug printing to be properly aware of
EDMA code.

* create a new TX EDMA descriptor struct to represent TX EDMA descriptors
when doing debugging;
* implement an EDMA printing function which:
+ hardcodes the TX map size to 4 for now;
+ correctly prints out the number of segments - there's one descriptor
for up to 4 buffers (segments), not one for each segment;
+ print out 4 DS buffer and len pointers;
+ print out the correct number of DWORDs in the TX descriptor.

TODO:

* Remove all of the hard-coded stuff. Ew.

Tidy up the TX status fields a little and add a couple new flags.

* shuffle things around so things fall on natural padding boundaries;
* add a couple of new flags to specify LDPC and whether to switch to the
low power RX chain configuration after this TX has completed.

Obtained from: Qualcomm Atheros

Add some AR9300 HAL descriptor definition changes.

* Add a couple of RX errors;
* Add the spectral scan PHY error code;
* extend the RX flags to be a 16 bit field, rather than an 8 bit field;
* Add a new RX flag.

Obtained from: Qualcomm Atheros

Shuffle some more fields in ath_buf so it's not too big.

This shaves off 20 bytes - from 288 bytes to 268 bytes.

However, it's still too big.

.. the AR5416 HAL code touches the MIMO parts in HAL_CHANNEL,
so this is also needed.

Pointed out by: bz

Commit a temporary workaround for people who are building kernels
where they've disabled all the wireless devices/framework.

This is just a build workaround. If you're actively using wireless,
you must still define AH_SUPPORT_AR5416 as I'm not sure what else
will break!

The real solution is to make the module build depend if AH_SUPPORT_AR5416
is defined, as well as make the 11n code in if_ath_tx.c and if_ath_tx_ht.c
completely optional (maybe depend upon ATH_SUPPORT_11N.)

Add some 11n bits from the if_ath_tx 11n branch:

* Add the TID field in the TX status descriptor;
* Add in the 11n first/middle/last functions for fiddling
with the descriptors. These are from the Linux and the
reference driver, but I'm not (currently) using them.
* Add further AR_ISR_S5 register definitions.

Obtained from: Linux ath9k, Atheros

Add some more phyerr bits.

Obtained from: Atheros
Approved by: re (kib)

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

Extend the RX descriptor block to include two more EVM words.

This will be needed for later AR93xx/AR94xx 3-stream devices.

purge HAL_TXSTAT_ALTRATE; you can figure this out by checking ts_finaltsi
and it cannot be used with MCS rate codes

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