Re: dual head r128

From: Benjamin Herrenschmidt (
Date: Fri Oct 13 2000 - 14:01:56 EST

>Or, more general, treat [PCI] I/O space similar to [PCI] memory space. Just
>like we must use ioremap() for memory space:
> cookie = ioremap(memory_space_address, size);
> x = readb(cookie+offset);
>we could have ioportremap() for I/O space:
> cookie = ioportremap(io_space_address, size);
> x = inb(cookie+offset);
>On PC, ioportremap(x) would evaluate to (x). On other platforms, we can do
>whatever we want.

That would make us fall in the same trap as we are now with multiple IO
busses having overlapping IO mappings. (Basically, every IO bus on some
multi-bus systems have 0->64k IO range). ioportremap() cannot "know" on
which bus the device is, except if we also pass the pci_dev* parameter
(and NULL for ISA).

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