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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 | */ | |
a18e3690 | 13 | static void pcibios_fixup_peer_bridges(void) |
1da177e4 | 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 | 32 | printk("PCI: Probing PCI hardware\n"); |
b7869ba1 | 33 | pcibios_scan_root(0); |
1da177e4 LT |
34 | return 0; |
35 | } | |
5707b24a | 36 | |
a18e3690 | 37 | void pcibios_scan_specific_bus(int busn) |
5707b24a AR |
38 | { |
39 | int devfn; | |
5707b24a AR |
40 | u32 l; |
41 | ||
42 | if (pci_find_bus(0, busn)) | |
43 | return; | |
44 | ||
5707b24a AR |
45 | for (devfn = 0; devfn < 256; devfn += 8) { |
46 | if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) && | |
47 | l != 0x0000 && l != 0xffff) { | |
48 | DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l); | |
49 | printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn); | |
3d2a3661 | 50 | pcibios_scan_root(busn); |
5707b24a AR |
51 | return; |
52 | } | |
53 | } | |
54 | } | |
d1fd4fb6 | 55 | EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus); |
1da177e4 | 56 | |
68d0d979 | 57 | static int __init pci_subsys_init(void) |
8dd779b1 | 58 | { |
b72d0db9 TG |
59 | /* |
60 | * The init function returns an non zero value when | |
61 | * pci_legacy_init should be invoked. | |
62 | */ | |
63 | if (x86_init.pci.init()) | |
64 | pci_legacy_init(); | |
65 | ||
e42d1fe8 | 66 | pcibios_fixup_peer_bridges(); |
ab3b3793 | 67 | x86_init.pci.init_irq(); |
8dd779b1 | 68 | pcibios_init(); |
3a62ed73 RR |
69 | |
70 | return 0; | |
8dd779b1 RR |
71 | } |
72 | subsys_initcall(pci_subsys_init); |