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 | { | |
5707b24a | 14 | int n; |
1da177e4 | 15 | |
9dd1e9eb | 16 | if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff) |
1da177e4 LT |
17 | return; |
18 | DBG("PCI: Peer bridge fixup\n"); | |
19 | ||
5707b24a AR |
20 | for (n=0; n <= pcibios_last_bus; n++) |
21 | pcibios_scan_specific_bus(n); | |
1da177e4 LT |
22 | } |
23 | ||
b72d0db9 | 24 | int __init pci_legacy_init(void) |
1da177e4 LT |
25 | { |
26 | if (!raw_pci_ops) { | |
27 | printk("PCI: System does not support PCI\n"); | |
28 | return 0; | |
29 | } | |
30 | ||
1da177e4 LT |
31 | printk("PCI: Probing PCI hardware\n"); |
32 | pci_root_bus = pcibios_scan_root(0); | |
c431ada4 RS |
33 | if (pci_root_bus) |
34 | pci_bus_add_devices(pci_root_bus); | |
1da177e4 | 35 | |
1da177e4 LT |
36 | return 0; |
37 | } | |
5707b24a | 38 | |
73cd3b43 | 39 | void __devinit pcibios_scan_specific_bus(int busn) |
5707b24a AR |
40 | { |
41 | int devfn; | |
42 | long node; | |
43 | u32 l; | |
44 | ||
45 | if (pci_find_bus(0, busn)) | |
46 | return; | |
47 | ||
48 | node = get_mp_bus_to_node(busn); | |
49 | for (devfn = 0; devfn < 256; devfn += 8) { | |
50 | if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) && | |
51 | l != 0x0000 && l != 0xffff) { | |
52 | DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l); | |
53 | printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn); | |
54 | pci_scan_bus_on_node(busn, &pci_root_ops, node); | |
55 | return; | |
56 | } | |
57 | } | |
58 | } | |
d1fd4fb6 | 59 | EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus); |
1da177e4 | 60 | |
8dd779b1 RR |
61 | int __init pci_subsys_init(void) |
62 | { | |
b72d0db9 TG |
63 | /* |
64 | * The init function returns an non zero value when | |
65 | * pci_legacy_init should be invoked. | |
66 | */ | |
67 | if (x86_init.pci.init()) | |
68 | pci_legacy_init(); | |
69 | ||
e42d1fe8 | 70 | pcibios_fixup_peer_bridges(); |
ab3b3793 | 71 | x86_init.pci.init_irq(); |
8dd779b1 | 72 | pcibios_init(); |
3a62ed73 RR |
73 | |
74 | return 0; | |
8dd779b1 RR |
75 | } |
76 | subsys_initcall(pci_subsys_init); |