On Sat, 28 Jul 2007 14:13:06 -0400
Jeff Garzik <jeff@xxxxxxxxxx> wrote:
> Yoichi Yuasa wrote:
> > Hi,
> >
> > I got the following error on MIPS Cobalt.
> > MIPS Cobalt has the 0x10000000 offset between resource and bus region.
> >
> > PCI: Unable to reserve I/O region #1:8@f00001f0 for device 0000:00:09.1
> > pata_via 0000:00:09.1: failed to request/iomap BARs for port 0 (errno=-16)
> > PCI: Unable to reserve I/O region #3:8@f0000170 for device 0000:00:09.1
> > pata_via 0000:00:09.1: failed to request/iomap BARs for port 1 (errno=-16)
> > pata_via 0000:00:09.1: no available native port
> >
> > At this point, these resources should be the bus regions.
> >
> > Signed-off-by: Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
>
> I'm not sure I understand what's going on here... could you or someone
> provide additional explanation as to why this is a fix?
The legacy mode IDE resources set the following order.
pci_setup_device()
Legacy mode ATA controllers have fixed addresses.
IDE resources: 0x1F0-0x1F7, 0x3F6, 0x170-0x177, 0x376
|
V
pcibios_fixup_bus()
MIPS Cobalt PCI bus have the -0x10000000 offset from PCI resources.
pcibios_fixup_bus() fix PCI bus regions.
0x1F0 - 0x10000000 = 0xF00001F0
|
V
ata_pci_init_one()
PCI: Unable to reserve I/O region #1:8@f00001f0 for device 0000:00:09.1
In some architectures, PCI bus have the offset from PCI resource.
They are adjusted by pcibios_fixup_bus().
For this reason, pci_setup_device() should set PCI bus regions.
Yoichi
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