PCI I/O space -- reg or ranges?
gerhard_pircher at gmx.net
Fri Sep 7 06:51:37 EST 2007
-------- Original-Nachricht --------
> Datum: Thu, 6 Sep 2007 09:15:01 -0500
> Von: Scott Wood <scottwood at freescale.com>
> An: Segher Boessenkool <segher at kernel.crashing.org>
> CC: linuxppc-dev at ozlabs.org, David Gibson <david at gibson.dropbear.id.au>
> Betreff: PCI I/O space -- reg or ranges?
> > Sure, it can be encoded like that. But does it make sense?
> > You cannot use legacy I/O space as normal memory space.
> Why does it not make sense? I'm not sure what you mean by using it as
> "normal memory space", but if the PCI bridge does a straightforward
> linear mapping of I/O into memory space (like most non-x86 bridges do),
> it seems to make sense to me to reuse the existing ranges mechanism
> rather than require each driver to have extra glue code.
Well, pci_process_bridge_OF_ranges() only looks at the ranges property to
ioremap() I/O space.
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