Adrian Chadd 3fdfc33024 Begin separating out the TX DMA setup in preparation for TX EDMA support.
* Introduce TX DMA setup/teardown methods, mirroring what's done in
  the RX path.

  Although the TX DMA descriptor is setup via ath_desc_alloc() /
  ath_desc_free(), there TX status descriptor ring will be allocated
  in this path.

* Remove some of the TX EDMA capability probing from the RX path and
  push it into the new TX EDMA path.
2012-07-23 03:52:18 +00:00
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