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legacy.c

/*
 * legacy.c - traditional, old school PCI bus probing
 */
#include <linux/init.h>
#include <linux/pci.h>
#include "pci.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;

      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;
            for (devfn = 0; devfn < 256; devfn += 8) {
                  if (!raw_pci_ops->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_with_sysdata(n);
                        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);

      pcibios_fixup_peer_bridges();

      return 0;
}

subsys_initcall(pci_legacy_init);

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