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TOMOYO Linux Cross Reference
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/jailhouse_para.h>
  8 #include <asm/pci_x86.h>
  9 
 10 /*
 11  * Discover remaining PCI buses in case there are peer host bridges.
 12  * We use the number of last PCI bus provided by the PCI BIOS.
 13  */
 14 static void pcibios_fixup_peer_bridges(void)
 15 {
 16         int n;
 17 
 18         if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
 19                 return;
 20         DBG("PCI: Peer bridge fixup\n");
 21 
 22         for (n=0; n <= pcibios_last_bus; n++)
 23                 pcibios_scan_specific_bus(n);
 24 }
 25 
 26 int __init pci_legacy_init(void)
 27 {
 28         if (!raw_pci_ops)
 29                 return 1;
 30 
 31         pr_info("PCI: Probing PCI hardware\n");
 32         pcibios_scan_root(0);
 33         return 0;
 34 }
 35 
 36 void pcibios_scan_specific_bus(int busn)
 37 {
 38         int stride = jailhouse_paravirt() ? 1 : 8;
 39         int devfn;
 40         u32 l;
 41 
 42         if (pci_find_bus(0, busn))
 43                 return;
 44 
 45         for (devfn = 0; devfn < 256; devfn += stride) {
 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                         pr_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                 if (pci_legacy_init()) {
 65                         pr_info("PCI: System does not support PCI\n");
 66                         return -ENODEV;
 67                 }
 68         }
 69 
 70         pcibios_fixup_peer_bridges();
 71         x86_init.pci.init_irq();
 72         pcibios_init();
 73 
 74         return 0;
 75 }
 76 subsys_initcall(pci_subsys_init);
 77 

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