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Linux/arch/x86/pci/legacy.c

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  1 /*
  2  * legacy.c - traditional, old school PCI bus probing
  3  */
  4 #include <linux/init.h>
  5 #include <linux/export.h>
  6 #include <linux/pci.h>
  7 #include <asm/pci_x86.h>
  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 pcibios_fixup_peer_bridges(void)
 14 {
 15         int n;
 16 
 17         if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
 18                 return;
 19         DBG("PCI: Peer bridge fixup\n");
 20 
 21         for (n=0; n <= pcibios_last_bus; n++)
 22                 pcibios_scan_specific_bus(n);
 23 }
 24 
 25 int __init pci_legacy_init(void)
 26 {
 27         if (!raw_pci_ops) {
 28                 printk("PCI: System does not support PCI\n");
 29                 return 0;
 30         }
 31 
 32         printk("PCI: Probing PCI hardware\n");
 33         pcibios_scan_root(0);
 34         return 0;
 35 }
 36 
 37 void pcibios_scan_specific_bus(int busn)
 38 {
 39         int devfn;
 40         u32 l;
 41 
 42         if (pci_find_bus(0, busn))
 43                 return;
 44 
 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);
 50                         pcibios_scan_root(busn);
 51                         return;
 52                 }
 53         }
 54 }
 55 EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus);
 56 
 57 static int __init pci_subsys_init(void)
 58 {
 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 
 66         pcibios_fixup_peer_bridges();
 67         x86_init.pci.init_irq();
 68         pcibios_init();
 69 
 70         return 0;
 71 }
 72 subsys_initcall(pci_subsys_init);
 73 

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