New API for non cache coherent ppc cpu's

[Dan Malek]

Paul Mackerras wrote:


> To go with pci_map_page and pci_unmap_page.  These give you the
> ability to do DMA to highmem pages without using bounce buffers.

IIRC, there was a virt_to_bus in the code at one time, making it
unusable for highmem pages, which is why I couldn't understand
the appearance of the function.


> My preference would be to make the one set of functions work
> everywhere.

Mine, too.  I just wish this was a common concept across a variety
of our I/O interfaces.

> ....  OTOH these non-PCI devices you're talking about are
> presumably very specific to PPC embedded chips so maybe it doesn't
> matter so much.

That is always a challenge with the embedded parts.  It is often
very convenient to make the (promper, IMHO) assumption this software
isn't going to be used outside of these parts.

Thanks.


	-- Dan


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