From: Matt Porter <mporter@kernel.crashing.org>

Reorg PPC DMA API. Use PCI DMA API wrapper and add coherent alloc in irq.
Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>