]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * legacy.c - traditional, old school PCI bus probing | |
3 | */ | |
4 | #include <linux/init.h> | |
5 | #include <linux/pci.h> | |
82487711 | 6 | #include <asm/pci_x86.h> |
1da177e4 LT |
7 | |
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. | |
11 | */ | |
12 | static void __devinit pcibios_fixup_peer_bridges(void) | |
13 | { | |
14 | int n, devfn; | |
871d5f8d | 15 | long node; |
1da177e4 | 16 | |
9dd1e9eb | 17 | if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff) |
1da177e4 LT |
18 | return; |
19 | DBG("PCI: Peer bridge fixup\n"); | |
20 | ||
21 | for (n=0; n <= pcibios_last_bus; n++) { | |
22 | u32 l; | |
23 | if (pci_find_bus(0, n)) | |
24 | continue; | |
871d5f8d | 25 | node = get_mp_bus_to_node(n); |
1da177e4 | 26 | for (devfn = 0; devfn < 256; devfn += 8) { |
b6ce068a | 27 | if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) && |
1da177e4 LT |
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); | |
871d5f8d | 31 | pci_scan_bus_on_node(n, &pci_root_ops, node); |
1da177e4 LT |
32 | break; |
33 | } | |
34 | } | |
35 | } | |
36 | } | |
37 | ||
b72d0db9 | 38 | int __init pci_legacy_init(void) |
1da177e4 LT |
39 | { |
40 | if (!raw_pci_ops) { | |
41 | printk("PCI: System does not support PCI\n"); | |
42 | return 0; | |
43 | } | |
44 | ||
1da177e4 LT |
45 | printk("PCI: Probing PCI hardware\n"); |
46 | pci_root_bus = pcibios_scan_root(0); | |
c431ada4 RS |
47 | if (pci_root_bus) |
48 | pci_bus_add_devices(pci_root_bus); | |
1da177e4 | 49 | |
1da177e4 LT |
50 | return 0; |
51 | } | |
52 | ||
8dd779b1 RR |
53 | int __init pci_subsys_init(void) |
54 | { | |
b72d0db9 TG |
55 | /* |
56 | * The init function returns an non zero value when | |
57 | * pci_legacy_init should be invoked. | |
58 | */ | |
59 | if (x86_init.pci.init()) | |
60 | pci_legacy_init(); | |
61 | ||
e42d1fe8 | 62 | pcibios_fixup_peer_bridges(); |
ab3b3793 | 63 | x86_init.pci.init_irq(); |
8dd779b1 | 64 | pcibios_init(); |
3a62ed73 RR |
65 | |
66 | return 0; | |
8dd779b1 RR |
67 | } |
68 | subsys_initcall(pci_subsys_init); |