[PATCH 0/6] ArmPkg EmbeddedPkg: clean up DmaLib implementations

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

Currently, we have two DmaLib implementations: a cache coherent one called
'NullDmaLib' residing in EmbeddedPkg, and a non-cache coherent one called
'ArmDmaLib', residinh in ArmPkg.

In both cases, this is slightly awkward: NullDmaLib suggests no functionality
whatsoever, which is slightly misleading because 'nothing' is the correct
action in case of cache coherent DMA, rather than a lack of action. As for
ArmDmalib, this was never specific to ARM, and no longer depends on anything
that ArmPkg provides, so it does not really belong in ArmPkg anymore.

So let's rename them to CoherentDmaLib and NonCoherentDmaLib, respectively,
and move that latter into EmbeddedPkg where it arguably belongs. To align
the two further, add support for non-1:1 DMA mappings to CoherentDmaLib as
well.

Note that the final patch can only be merged after out-of-tree platforms
have switched from ArmDmaLib to NonCoherentDmaLib.

Ard Biesheuvel (6):
  EmbeddedPkg: rename NullDmaLib to CoherentDmaLib
  EmbeddedPkg/CoherentDmaLib: add support for non-1:1 DMA translation
  EmbeddedPkg: implement NonCoherentDmaLib based on ArmDmaLib
  Omap35xxPkg: switch to EmbeddedPkg's NonCoherentDmaLib
  BeagleBoardPkg: switch to generic non-coherent DmaLib
  ArmPkg: remove ArmDmaLib

 ArmPkg/ArmPkg.dsc                                                                                 |   2 -
 ArmPkg/Library/ArmDmaLib/ArmDmaLib.inf                                                            |  49 ---------
 BeagleBoardPkg/BeagleBoardPkg.dsc                                                                 |   2 +-
 EmbeddedPkg/EmbeddedPkg.dec                                                                       |   7 ++
 EmbeddedPkg/EmbeddedPkg.dsc                                                                       |   3 +-
 EmbeddedPkg/Library/{NullDmaLib/NullDmaLib.c => CoherentDmaLib/CoherentDmaLib.c}                  |  10 +-
 EmbeddedPkg/Library/{NullDmaLib/NullDmaLib.inf => CoherentDmaLib/CoherentDmaLib.inf}              |  19 ++--
 ArmPkg/Library/ArmDmaLib/ArmDmaLib.c => EmbeddedPkg/Library/NonCoherentDmaLib/NonCoherentDmaLib.c | 105 +++++++++++---------
 EmbeddedPkg/Library/NonCoherentDmaLib/NonCoherentDmaLib.inf                                       |  50 ++++++++++
 Omap35xxPkg/Omap35xxPkg.dsc                                                                       |   2 +-
 10 files changed, 136 insertions(+), 113 deletions(-)
 delete mode 100644 ArmPkg/Library/ArmDmaLib/ArmDmaLib.inf
 rename EmbeddedPkg/Library/{NullDmaLib/NullDmaLib.c => CoherentDmaLib/CoherentDmaLib.c} (94%)
 rename EmbeddedPkg/Library/{NullDmaLib/NullDmaLib.inf => CoherentDmaLib/CoherentDmaLib.inf} (75%)
 rename ArmPkg/Library/ArmDmaLib/ArmDmaLib.c => EmbeddedPkg/Library/NonCoherentDmaLib/NonCoherentDmaLib.c (82%)
 create mode 100644 EmbeddedPkg/Library/NonCoherentDmaLib/NonCoherentDmaLib.inf

-- 
2.11.0