Vlv2TbltDevicePkg/PlatformDxe/SlotConfig.c

   1 /** @file
   2
   3   Copyright (c) 2004  - 2014, Intel Corporation. All rights reserved.<BR>
   4
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7
   8
   9 Module Name:
  10
  11   SlotConfig.c
  12
  13 Abstract:
  14
  15   Sets platform/SKU specific expansion slot information.
  16
  17
  18
  19 --*/
  20 #include "SlotConfig.h"
  21
  22 //
  23 // Implementation
  24 //
  25 VOID
  26 InitializeSlotInfo (
  27   )
  28 {
  29   UINT16                              BusSaveState;
  30   UINT16                              Vendor;
  31   UINT8                               CurrentBus;
  32   UINTN                               i;
  33   UINTN                               j;
  34   EFI_HANDLE                          Handle;
  35   EFI_STATUS                          Status;
  36   BOOLEAN                             RunNext;
  37
  38   //
  39   // Loop through the slot table and see if any slots have cards in them
  40   //
  41   for (i = 0; i < mSlotBridgeTableSize; i++) {
  42     //
  43     // Initialize variable
  44     //
  45     RunNext = FALSE;
  46
  47     //
  48     // Hide mini PCIe slots per SKU
  49     //
  50     for (j = 0; j < mSlotInformation.NumberOfEntries; j++) {
  51       if (mSlotInformation.SlotEntries[j].SmbiosSlotId == mSlotBridgeTable[i].SmbiosSlotId) {
  52         if ((mSlotInformation.SlotEntries[j].SmbiosSlotId == 0x02) &&
  53             (mBoardFeatures & B_BOARD_FEATURES_NO_MINIPCIE)
  54           ) {
  55           mSlotInformation.SlotEntries[j].Disabled = TRUE;
  56           RunNext = TRUE;
  57         }
  58         break;
  59       }
  60     }
  61
  62     if (RunNext) {
  63       //
  64       // Skip slot device detection since the slot is disabled.
  65       //
  66       continue;
  67     }
  68
  69     //
  70     // Check to see if the bridge has a bus number and assign one if not
  71     //
  72     BusSaveState = MmPci16 (
  73       0,
  74       mSlotBridgeTable[i].Bus,
  75       mSlotBridgeTable[i].Dev,
  76       mSlotBridgeTable[i].Function,
  77       PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET
  78                             );
  79     if (BusSaveState == 0) {
  80       //
  81       // Assign temp bus number
  82       //
  83       MmPci16 (
  84         0,
  85         mSlotBridgeTable[i].Bus,
  86         mSlotBridgeTable[i].Dev,
  87         mSlotBridgeTable[i].Function,
  88         PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET
  89         ) = DEF_BUS_CONFIG;
  90       CurrentBus = DEF_BUS;
  91     } else if (BusSaveState == 0xFFFF) {
  92       //
  93       // Bridge is disabled so continue with next entry in the table
  94       //
  95       continue;
  96     } else {
  97       //
  98       // Use existing bus number
  99       //
 100       CurrentBus = (UINT8) BusSaveState & 0xFF;
 101     }
 102
 103     //
 104     // Check to see if a device is behind the bridge
 105     //
 106     Vendor = MmPci16 (
 107                0,
 108                CurrentBus,
 109                mSlotBridgeTable[i].TargetDevice,
 110                0,
 111                0
 112                );
 113     if (Vendor != 0xFFFF) {
 114       //
 115       // Device found so make sure the slot is marked that way
 116       //
 117       for (j = 0; j < mSlotInformation.NumberOfEntries; j++) {
 118         if (mSlotInformation.SlotEntries[j].SmbiosSlotId == mSlotBridgeTable[i].SmbiosSlotId) {
 119           mSlotInformation.SlotEntries[j].InUse = TRUE;
 120           break;
 121         }
 122       }
 123     }
 124
 125     //
 126     // Restore previous bus information
 127     //
 128     if (BusSaveState == 0) {
 129       MmPci16 (
 130         0,
 131         mSlotBridgeTable[i].Bus,
 132         mSlotBridgeTable[i].Dev,
 133         mSlotBridgeTable[i].Function,
 134         PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET
 135         ) = 0;
 136     }
 137   }
 138
 139   Handle = NULL;
 140   Status = gBS->InstallProtocolInterface (
 141                   &Handle,
 142                   &gEfiSmbiosSlotPopulationGuid,
 143                   EFI_NATIVE_INTERFACE,
 144                   &mSlotInformation
 145                   );
 146   ASSERT_EFI_ERROR(Status);
 147
 148 }