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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> | |
5 | #include <linux/pci.h> | |
6 | #include "pci.h" | |
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 | ||
38 | static int __init pci_legacy_init(void) | |
39 | { | |
40 | if (!raw_pci_ops) { | |
41 | printk("PCI: System does not support PCI\n"); | |
42 | return 0; | |
43 | } | |
44 | ||
45 | if (pcibios_scanned++) | |
46 | return 0; | |
47 | ||
48 | printk("PCI: Probing PCI hardware\n"); | |
49 | pci_root_bus = pcibios_scan_root(0); | |
c431ada4 RS |
50 | if (pci_root_bus) |
51 | pci_bus_add_devices(pci_root_bus); | |
1da177e4 LT |
52 | |
53 | pcibios_fixup_peer_bridges(); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
8dd779b1 RR |
58 | int __init pci_subsys_init(void) |
59 | { | |
060b9708 | 60 | #ifdef CONFIG_X86_NUMAQ |
e27cf3a2 | 61 | pci_numaq_init(); |
060b9708 | 62 | #endif |
8dd779b1 RR |
63 | #ifdef CONFIG_ACPI |
64 | pci_acpi_init(); | |
3cabf37f RR |
65 | #endif |
66 | #ifdef CONFIG_X86_VISWS | |
67 | pci_visws_init(); | |
8dd779b1 RR |
68 | #endif |
69 | pci_legacy_init(); | |
70 | pcibios_irq_init(); | |
71 | pcibios_init(); | |
3a62ed73 RR |
72 | |
73 | return 0; | |
8dd779b1 RR |
74 | } |
75 | subsys_initcall(pci_subsys_init); |