LongTrail PCI resource assignment

[Geert Uytterhoeven]

FYI, I played some more with PCI resources on the MIPS (to be applied to my
LongTrail in the near future :-)

You can specify from which region resources are allocated by doing this

  - create a `pci mem' resource with start and end corresponding to the PCI
    memory space region that is provided by your host bridge
  - call request_resource(&iomem_resource, &my_pci_mem_resource);
  - change bus->resource[1] = &my_pci_mem_resource in your machine specific
    pcibios_fixup_bus()

After this, all resources will be allocated from the `parent' PCI mem resource,
which is my_pci_mem_resource now (by default (drivers/pci/pci.c),
bus->resource[1] points to iomem_resource).

Result for the MIPS, where _all_ resources must be assigned by calling
pci_assign_unassigned_resources() afterwards:

    root # cat /proc/iomem
 *  00000000-03ffffff : RAM
 *  04000000-043fffff : Flash ROM
 *  06000000-060fffff : Nile4 ISA I/O
 *  06100000-07ffffff : Nile4 PCI I/O
 *  08000000-08ffffff : Nile4 ISA mem
 *  09000000-0fffffff : Nile4 PCI mem
      09000000-0900007f : Digital Equipment Corporation DECchip 21140 [Fa
      09001000-09001fff : Acer Laboratories Inc. [ALi] M5237 USB
      09040000-0907ffff : Digital Equipment Corporation DECchip 21140 [Fa
 *  1fa00000-1fbfffff : Nile4 ctrl
 *  1fc00000-1fffffff : Boot ROM
    root #

All resources marked with `*' were manually requested before calling
pci_scan_bus(), but only `Nile4 PCI mem' matters here.

The example considers PCI memory space only. PCI I/O space is left as an
exercise for the reader :-)

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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