Various PMac PCI patches

[Michel Lanners]

On  19 Aug, this message from Ryan Nielsen echoed through cyberspace:
> Michel Lanners wrote:
>> > isa_io_base is set to the address of bus 0 !
>> > so inl() and friends use wrong address for cards on bus 1.
>> 
>> That's expected (and broken) behaviour right now; I know how to correct
>> the problem, but I need to do some hacking to get it coded right.
> 
> What are you plannering ?
> 
> I got tulip working by #define _IO_BASE DRIVER_IO_BASE (ifdef) in asm/io.h
> and define DRIVER_IO_BASE to a value from pci_io_base(bus) in tulip.c

Fixing IO space addresses in the kernel pci structs, so that any driver
referencing the pci structs gets the right kernel virtual address for
the  ports without fiddling with _IO_BASE. In fact, it means adding an
offset to the address reported in the PCI device's config registers.
This offset id provided by the parent bus bridge.

Michel

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