diff options
| -rw-r--r-- | arch/powerpc/kernel/pci-common.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index b6d4767e4e2..1037b3a093e 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -776,6 +776,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); static void __devinit __pcibios_fixup_bus(struct pci_bus *bus) { + struct pci_controller *hose = pci_bus_to_host(bus); struct pci_dev *dev = bus->self; pr_debug("PCI: Fixup bus %d (%s)\n", bus->number, dev ? pci_name(dev) : "PHB"); @@ -793,6 +794,27 @@ static void __devinit __pcibios_fixup_bus(struct pci_bus *bus) if (!res->flags || bus->self->transparent) continue; + /* On PowerMac, Apple leaves bridge windows open over + * an inaccessible region of memory space (0...fffff) + * which is somewhat bogus, but that's what they think + * means disabled... + * + * We clear those to force them to be reallocated later + * + * We detect such regions by the fact that the base is + * equal to the pci_mem_offset of the host bridge and + * their size is smaller than 1M. + */ + if (res->start == hose->pci_mem_offset && + res->end < 0x100000) { + printk(KERN_INFO + "PCI: Closing bogus Apple Firmware" + " region %d on bus 0x%02x\n", + i, bus->number); + res->flags = 0; + continue; + } + pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n", pci_name(dev), i, (unsigned long long)res->start,\ |