xorg-server-1.4/hw/xfree86/os-support/bus/altixPCI.c

   1 /*
   2  * This file contains the glue necessary for support of SGI's Altix chipset.
   3  */
   4 #ifdef HAVE_XORG_CONFIG_H
   5 #include <xorg-config.h>
   6 #endif
   7
   8 #include <stdio.h>
   9 #include <unistd.h>
  10 #include "altixPCI.h"
  11 #include "xf86.h"
  12 #include "Pci.h"
  13
  14 void xf86PreScanAltix(void)
  15 {
  16         /* Nothing to see here... */
  17 }
  18
  19 void xf86PostScanAltix(void)
  20 {
  21         pciConfigPtr *pdev;
  22         int idx, free_idx;
  23
  24         /*
  25          * Some altix pci chipsets do not expose themselves as host
  26          * bridges.
  27          *
  28          * Walk the devices looking for buses for which there is not a
  29          * corresponding pciDevice entry (ie. pciBusInfo[]->bridge is NULL).
  30          *
  31          * It is assumed that this indicates a root bridge for which we will
  32          * construct a fake pci host bridge device.
  33          */
  34
  35         pdev = xf86scanpci(0);
  36         for (idx = 0; pdev[idx] != NULL; idx++)
  37                 ;
  38
  39         free_idx = idx;
  40
  41         for (idx = 0; idx < free_idx; idx++) {
  42                 pciConfigPtr dev, fakedev;
  43                 pciBusInfo_t *businfo;
  44
  45                 dev = pdev[idx];
  46                 businfo = pciBusInfo[dev->busnum];
  47
  48                 if (! businfo) {
  49                         /* device has no bus ... should this be an error? */
  50                         continue;
  51                 }
  52
  53                 if (businfo->bridge) {
  54                         /* bus has a device ... no need for fixup */
  55                         continue;
  56                 }
  57
  58                 if (free_idx >= MAX_PCI_DEVICES)
  59                         FatalError("SN: No room for fake root bridge device\n");
  60
  61                 /*
  62                  * Construct a fake device and stick it at the end of the
  63                  * pdev array.  Make it look like a host bridge.
  64                  */
  65                 fakedev = xnfcalloc(1, sizeof(pciDevice));
  66                 fakedev->tag = PCI_MAKE_TAG(dev->busnum, 0, 0);;
  67                 fakedev->busnum = dev->busnum;
  68                 fakedev->devnum = 0;
  69                 fakedev->funcnum = 0;
  70                 fakedev->fakeDevice = 1;
  71                 /* should figure out a better DEVID */
  72                 fakedev->pci_device_vendor = DEVID(VENDOR_GENERIC, CHIP_VGA);
  73                 fakedev->pci_base_class = PCI_CLASS_BRIDGE;
  74
  75                 businfo->secondary = 0;
  76                 businfo->primary_bus = dev->busnum;
  77                 businfo->bridge = fakedev;
  78
  79                 fakedev->businfo = businfo;
  80
  81                 pdev[free_idx++] = fakedev;
  82         }
  83 }