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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                 return 1;
 29 
 30         pr_info("PCI: Probing PCI hardware\n");
 31         pcibios_scan_root(0);
 32         return 0;
 33 }
 34 
 35 void pcibios_scan_specific_bus(int busn)
 36 {
 37         int devfn;
 38         u32 l;
 39 
 40         if (pci_find_bus(0, busn))
 41                 return;
 42 
 43         for (devfn = 0; devfn < 256; devfn += 8) {
 44                 if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
 45                     l != 0x0000 && l != 0xffff) {
 46                         DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
 47                         pr_info("PCI: Discovered peer bus %02x\n", busn);
 48                         pcibios_scan_root(busn);
 49                         return;
 50                 }
 51         }
 52 }
 53 EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus);
 54 
 55 static int __init pci_subsys_init(void)
 56 {
 57         /*
 58          * The init function returns an non zero value when
 59          * pci_legacy_init should be invoked.
 60          */
 61         if (x86_init.pci.init()) {
 62                 if (pci_legacy_init()) {
 63                         pr_info("PCI: System does not support PCI\n");
 64                         return -ENODEV;
 65                 }
 66         }
 67 
 68         pcibios_fixup_peer_bridges();
 69         x86_init.pci.init_irq();
 70         pcibios_init();
 71 
 72         return 0;
 73 }
 74 subsys_initcall(pci_subsys_init);
 75 

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