[PATCH 0/4] POWERPC: 32/64-bit DMA code merge and cleanup

[Becky Bruce]

This patch series merges the 32 and 64-bit dma code and does some
other cleanup.  This has changed a bit since the RFC was submitted
a few months ago - I incorporated most of the comments from Christoph,
including moving the iommu-specific code into its own file and dropping
numa_node from archdata - we now use the version in the struct
device.

Now that the 32-bit code has a dma_ops structure that is used to
access the dma functions, we will be more easily able to implement
swiotlb or iommu-type dma by setting dma_ops up to use an alternate
set of operations.

I have tested this code on 8641 and 8572 platforms using the popular
kernel build as well as full runs of LTP.  I have built 64-bit
platforms, but have no means to test there, so I would greatly
appreciate any feedback you can provide on possible issues. 

Cheers,
Becky