ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / arch / x86 / pci / legacy.c
bloba67921ce60af1faabf9c8ccbf538b546103ebb04
1 /*
2 * legacy.c - traditional, old school PCI bus probing
3 */
4 #include <linux/init.h>
5 #include <linux/pci.h>
6 #include "pci.h"
8 /*
9 * Discover remaining PCI buses in case there are peer host bridges.
10 * We use the number of last PCI bus provided by the PCI BIOS.
12 static void __devinit pcibios_fixup_peer_bridges(void)
14 int n, devfn;
15 long node;
17 if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
18 return;
19 DBG("PCI: Peer bridge fixup\n");
21 for (n=0; n <= pcibios_last_bus; n++) {
22 u32 l;
23 if (pci_find_bus(0, n))
24 continue;
25 node = get_mp_bus_to_node(n);
26 for (devfn = 0; devfn < 256; devfn += 8) {
27 if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
28 l != 0x0000 && l != 0xffff) {
29 DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
30 printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
31 pci_scan_bus_on_node(n, &pci_root_ops, node);
32 break;
38 static int __init pci_legacy_init(void)
40 if (!raw_pci_ops) {
41 printk("PCI: System does not support PCI\n");
42 return 0;
45 if (pcibios_scanned++)
46 return 0;
48 printk("PCI: Probing PCI hardware\n");
49 pci_root_bus = pcibios_scan_root(0);
50 if (pci_root_bus)
51 pci_bus_add_devices(pci_root_bus);
53 pcibios_fixup_peer_bridges();
55 return 0;
58 subsys_initcall(pci_legacy_init);