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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 587 | giacomo | 1 | /* |
| 2 | * legacy.c - traditional, old school PCI bus probing |
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| 3 | */ |
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| 4 | #include <linuxcomp.h> |
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| 5 | |||
| 6 | #include <linux/init.h> |
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| 7 | #include <linux/pci.h> |
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| 8 | #include "pci2.h" |
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| 9 | |||
| 10 | /* |
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| 11 | * Discover remaining PCI buses in case there are peer host bridges. |
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| 12 | * We use the number of last PCI bus provided by the PCI BIOS. |
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| 13 | */ |
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| 14 | static void __devinit pcibios_fixup_peer_bridges(void) |
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| 15 | { |
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| 16 | int n, devfn; |
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| 17 | |||
| 18 | if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff) |
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| 19 | return; |
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| 20 | DBG("PCI: Peer bridge fixup\n"); |
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| 21 | |||
| 22 | for (n=0; n <= pcibios_last_bus; n++) { |
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| 23 | u32 l; |
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| 24 | if (pci_find_bus(0, n)) |
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| 25 | continue; |
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| 26 | for (devfn = 0; devfn < 256; devfn += 8) { |
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| 27 | if (!raw_pci_ops->read(0, n, devfn, PCI_VENDOR_ID, 2, &l) && |
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| 28 | l != 0x0000 && l != 0xffff) { |
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| 29 | DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l); |
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| 30 | printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n); |
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| 31 | pci_scan_bus(n, &pci_root_ops, NULL); |
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| 32 | break; |
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| 33 | } |
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| 34 | } |
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| 35 | } |
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| 36 | } |
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| 37 | |||
| 38 | int __init pci_legacy_init(void) |
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| 39 | { |
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| 40 | if (!raw_pci_ops) { |
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| 41 | printk("PCI: System does not support PCI\n"); |
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| 42 | return 0; |
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| 43 | } |
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| 44 | |||
| 45 | if (pcibios_scanned++) |
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| 46 | return 0; |
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| 47 | |||
| 48 | printk("PCI: Probing PCI hardware\n"); |
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| 49 | pci_root_bus = pcibios_scan_root(0); |
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| 50 | |||
| 51 | pcibios_fixup_peer_bridges(); |
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| 52 | |||
| 53 | return 0; |
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| 54 | } |
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| 55 | |||
| 56 | subsys_initcall(pci_legacy_init); |