| /* |
| * legacy.c - traditional, old school PCI bus probing |
| */ |
| #include <linux/init.h> |
| #include <linux/pci.h> |
| #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; |
| long node; |
| |
| 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; |
| node = get_mp_bus_to_node(n); |
| for (devfn = 0; devfn < 256; devfn += 8) { |
| if (!raw_pci_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_on_node(n, &pci_root_ops, node); |
| 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; |
| } |
| |
| int __init pci_subsys_init(void) |
| { |
| #ifdef CONFIG_ACPI |
| pci_acpi_init(); |
| #endif |
| pci_legacy_init(); |
| pcibios_irq_init(); |
| #ifdef CONFIG_X86_NUMAQ |
| pci_numa_init(); |
| #endif |
| pcibios_init(); |
| |
| return 0; |
| } |
| subsys_initcall(pci_subsys_init); |