From fb9aa6f1d4a1e11e66a680460b2c2b2b10b62f79 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 11 Oct 2007 11:16:36 +0200 Subject: i386: move pci Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- arch/x86/pci/legacy.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 arch/x86/pci/legacy.c (limited to 'arch/x86/pci/legacy.c') diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c new file mode 100644 index 00000000000..5565d7016b7 --- /dev/null +++ b/arch/x86/pci/legacy.c @@ -0,0 +1,56 @@ +/* + * legacy.c - traditional, old school PCI bus probing + */ +#include +#include +#include "pci.h" + +/* + * Discover remaining PCI buses in case there are peer host bridges. + * We use the number of last PCI bus provided by the PCI BIOS. + */ +static void __devinit pcibios_fixup_peer_bridges(void) +{ + int n, devfn; + + if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff) + return; + DBG("PCI: Peer bridge fixup\n"); + + for (n=0; n <= pcibios_last_bus; n++) { + u32 l; + if (pci_find_bus(0, n)) + continue; + for (devfn = 0; devfn < 256; devfn += 8) { + if (!raw_pci_ops->read(0, n, devfn, PCI_VENDOR_ID, 2, &l) && + l != 0x0000 && l != 0xffff) { + DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l); + printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n); + pci_scan_bus_with_sysdata(n); + break; + } + } + } +} + +static int __init pci_legacy_init(void) +{ + if (!raw_pci_ops) { + printk("PCI: System does not support PCI\n"); + return 0; + } + + if (pcibios_scanned++) + return 0; + + printk("PCI: Probing PCI hardware\n"); + pci_root_bus = pcibios_scan_root(0); + if (pci_root_bus) + pci_bus_add_devices(pci_root_bus); + + pcibios_fixup_peer_bridges(); + + return 0; +} + +subsys_initcall(pci_legacy_init); -- cgit v1.2.2