parisc: properly type the return value of parisc_walk_tree

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Helge Deller <deller@gmx.de>

parisc: turn GET_IOC into an inline function

This makes the function both more readable and more typesafe.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Helge Deller <deller@gmx.de>

parisc: move internal implementation details out of <asm/dma-mapping.h>

Move everything that is not required for the public facing DMA API out
of <asm/dma-mapping.h> and into a new drivers/parisc/iommu.h header.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Helge Deller <deller@gmx.de>