__ioremap_at() in 2.4.0-test9-pre2

[Frank Rowand]

Benjamin Herrenschmidt wrote:
>
> >Life would be much simpler if PCI I/O space used a similar opaque IO base
> >cookie with a corresponding ioportremap(cookie) function (looks a lot like
> >Dan's tell_me_where() function, which I didn't realize until now :-), before
> >feeding everything to inb() and friends. On ia32, ioportremap() would
> evaluate
> >to the identity.
> >
> >No way we can convince The Others to use this approach? It does sound logical
> >:-)
>
> I'm not sure it would help. It would probably allow a kind of "mapping on
> demand" of the IO region on memory mapped IOs platforms, but unless we
> add another parameter to ioportremap telling it the pci_dev (or at least
> the bus number), we can't "guess" on which IO bus the device is and which
> physical base we must use.
>
> Ben.
>

Yes, we should add pci_dev to ioportremap(), which can then extract the
bus number from pci_dev->pci_bus.

-Frank
--
Frank Rowand <frank_rowand at mvista.com>
MontaVista Software, Inc

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