cache coherency on I/O

[Vivien Chappelier <vivien.chappelier@enst-bretagne.fr>]

Hi,

        Here is a patch to fix cache coherency when doing I/O on the
O2. It simply adds writeback and invalidate when unmapping DMA
memory. This fixes coherency when reading from a device. It
also adds support for mapping/unmapping pages for both the IP27 and
the O2.

Vivien Chappelier.

linux-O2-coherent_io.diff
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