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- /*
- * legacy.c - traditional, old school PCI bus probing
- */
- #include <linux/init.h>
- #include <linux/pci.h>
- #include <asm/pci_x86.h>
- /*
- * Discover remaining PCI buses in case there are peer host bridges.
- * We use the number of last PCI bus provided by the PCI BIOS.
- */
- static void __devinit pcibios_fixup_peer_bridges(void)
- {
- int n, devfn;
- long node;
- if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
- return;
- DBG("PCI: Peer bridge fixup\n");
- for (n=0; n <= pcibios_last_bus; n++) {
- u32 l;
- if (pci_find_bus(0, n))
- continue;
- node = get_mp_bus_to_node(n);
- for (devfn = 0; devfn < 256; devfn += 8) {
- if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
- l != 0x0000 && l != 0xffff) {
- DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
- printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
- pci_scan_bus_on_node(n, &pci_root_ops, node);
- break;
- }
- }
- }
- }
- static int __init pci_legacy_init(void)
- {
- if (!raw_pci_ops) {
- printk("PCI: System does not support PCI\n");
- return 0;
- }
- if (pcibios_scanned++)
- return 0;
- printk("PCI: Probing PCI hardware\n");
- pci_root_bus = pcibios_scan_root(0);
- if (pci_root_bus)
- pci_bus_add_devices(pci_root_bus);
- return 0;
- }
- int __init pci_subsys_init(void)
- {
- #ifdef CONFIG_X86_NUMAQ
- pci_numaq_init();
- #endif
- #ifdef CONFIG_ACPI
- pci_acpi_init();
- #endif
- #ifdef CONFIG_X86_VISWS
- pci_visws_init();
- #endif
- pci_legacy_init();
- pcibios_fixup_peer_bridges();
- pcibios_irq_init();
- pcibios_init();
- return 0;
- }
- subsys_initcall(pci_subsys_init);
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