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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * legacy.c - traditional, old school PCI bus probing | |
3 | */ | |
4 | #include <linux/init.h> | |
69c60c88 | 5 | #include <linux/export.h> |
1da177e4 | 6 | #include <linux/pci.h> |
82487711 | 7 | #include <asm/pci_x86.h> |
1da177e4 LT |
8 | |
9 | /* | |
10 | * Discover remaining PCI buses in case there are peer host bridges. | |
11 | * We use the number of last PCI bus provided by the PCI BIOS. | |
12 | */ | |
13 | static void __devinit pcibios_fixup_peer_bridges(void) | |
14 | { | |
5707b24a | 15 | int n; |
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 | ||
5707b24a AR |
21 | for (n=0; n <= pcibios_last_bus; n++) |
22 | pcibios_scan_specific_bus(n); | |
1da177e4 LT |
23 | } |
24 | ||
b72d0db9 | 25 | int __init pci_legacy_init(void) |
1da177e4 LT |
26 | { |
27 | if (!raw_pci_ops) { | |
28 | printk("PCI: System does not support PCI\n"); | |
29 | return 0; | |
30 | } | |
31 | ||
1da177e4 LT |
32 | printk("PCI: Probing PCI hardware\n"); |
33 | pci_root_bus = pcibios_scan_root(0); | |
c431ada4 RS |
34 | if (pci_root_bus) |
35 | pci_bus_add_devices(pci_root_bus); | |
1da177e4 | 36 | |
1da177e4 LT |
37 | return 0; |
38 | } | |
5707b24a | 39 | |
73cd3b43 | 40 | void __devinit pcibios_scan_specific_bus(int busn) |
5707b24a AR |
41 | { |
42 | int devfn; | |
43 | long node; | |
44 | u32 l; | |
45 | ||
46 | if (pci_find_bus(0, busn)) | |
47 | return; | |
48 | ||
49 | node = get_mp_bus_to_node(busn); | |
50 | for (devfn = 0; devfn < 256; devfn += 8) { | |
51 | if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) && | |
52 | l != 0x0000 && l != 0xffff) { | |
53 | DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l); | |
54 | printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn); | |
55 | pci_scan_bus_on_node(busn, &pci_root_ops, node); | |
56 | return; | |
57 | } | |
58 | } | |
59 | } | |
d1fd4fb6 | 60 | EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus); |
1da177e4 | 61 | |
8dd779b1 RR |
62 | int __init pci_subsys_init(void) |
63 | { | |
b72d0db9 TG |
64 | /* |
65 | * The init function returns an non zero value when | |
66 | * pci_legacy_init should be invoked. | |
67 | */ | |
68 | if (x86_init.pci.init()) | |
69 | pci_legacy_init(); | |
70 | ||
e42d1fe8 | 71 | pcibios_fixup_peer_bridges(); |
ab3b3793 | 72 | x86_init.pci.init_irq(); |
8dd779b1 | 73 | pcibios_init(); |
3a62ed73 RR |
74 | |
75 | return 0; | |
8dd779b1 RR |
76 | } |
77 | subsys_initcall(pci_subsys_init); |