audk/Vlv2TbltDevicePkg/PlatformDxe/SlotConfig.c

/** @file

  Copyright (c) 2004  - 2014, Intel Corporation. All rights reserved.<BR>
                                                                                   
  This program and the accompanying materials are licensed and made available under
  the terms and conditions of the BSD License that accompanies this distribution.  
  The full text of the license may be found at                                     
  http://opensource.org/licenses/bsd-license.php.                                  
                                                                                   
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,            
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.    
                                                                                   

Module Name:

  SlotConfig.c

Abstract:

  Sets platform/SKU specific expansion slot information.



--*/
#include "SlotConfig.h"

//
// Implementation
//
VOID
InitializeSlotInfo (
  )
{
  UINT16                              BusSaveState;
  UINT16                              Vendor;
  UINT8                               CurrentBus;
  UINTN                               i;
  UINTN                               j;
  EFI_HANDLE                          Handle;
  EFI_STATUS                          Status;
  BOOLEAN                             RunNext;

  //
  // Loop through the slot table and see if any slots have cards in them
  //
  for (i = 0; i < mSlotBridgeTableSize; i++) {
    //
    // Initialize variable
    //
    RunNext = FALSE;

    //
    // Hide mini PCIe slots per SKU
    //
    for (j = 0; j < mSlotInformation.NumberOfEntries; j++) {
      if (mSlotInformation.SlotEntries[j].SmbiosSlotId == mSlotBridgeTable[i].SmbiosSlotId) {
        if ((mSlotInformation.SlotEntries[j].SmbiosSlotId == 0x02) &&
            (mBoardFeatures & B_BOARD_FEATURES_NO_MINIPCIE)
          ) {
          mSlotInformation.SlotEntries[j].Disabled = TRUE;
          RunNext = TRUE;
        }
        break;
      }
    }

    if (RunNext) {
      //
      // Skip slot device detection since the slot is disabled.
      //
      continue;
    }

    //
    // Check to see if the bridge has a bus number and assign one if not
    //
    BusSaveState = MmPci16 (
      0,
      mSlotBridgeTable[i].Bus,
      mSlotBridgeTable[i].Dev,
      mSlotBridgeTable[i].Function,
      PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET
                            );
    if (BusSaveState == 0) {
      //
      // Assign temp bus number
      //
      MmPci16 (
        0,
        mSlotBridgeTable[i].Bus,
        mSlotBridgeTable[i].Dev,
        mSlotBridgeTable[i].Function,
        PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET
        ) = DEF_BUS_CONFIG;
      CurrentBus = DEF_BUS;
    } else if (BusSaveState == 0xFFFF) {
      //
      // Bridge is disabled so continue with next entry in the table
      //
      continue;
    } else {
      //
      // Use existing bus number
      //
      CurrentBus = (UINT8) BusSaveState & 0xFF;
    }

    //
    // Check to see if a device is behind the bridge
    //
    Vendor = MmPci16 (
               0,
               CurrentBus,
               mSlotBridgeTable[i].TargetDevice,
               0,
               0
               );
    if (Vendor != 0xFFFF) {
      //
      // Device found so make sure the slot is marked that way
      //
      for (j = 0; j < mSlotInformation.NumberOfEntries; j++) {
        if (mSlotInformation.SlotEntries[j].SmbiosSlotId == mSlotBridgeTable[i].SmbiosSlotId) {
          mSlotInformation.SlotEntries[j].InUse = TRUE;
          break;
        }
      }
    }

    //
    // Restore previous bus information
    //
    if (BusSaveState == 0) {
      MmPci16 (
        0,
        mSlotBridgeTable[i].Bus,
        mSlotBridgeTable[i].Dev,
        mSlotBridgeTable[i].Function,
        PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET
        ) = 0;
    }
  }

  Handle = NULL;
  Status = gBS->InstallProtocolInterface (
                  &Handle,
                  &gEfiSmbiosSlotPopulationGuid,
                  EFI_NATIVE_INTERFACE,
                  &mSlotInformation
                  );
  ASSERT_EFI_ERROR(Status);

}