Vlv2TbltDevicePkg/PlatformDxe/ExI.c

   1 /** @file
   2
   3   Copyright (c) 2004  - 2014, Intel Corporation. All rights reserved.<BR>
   4
   5   This program and the accompanying materials are licensed and made available under
   6   the terms and conditions of the BSD License that accompanies this distribution.
   7   The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13
  14 Module Name:
  15
  16
  17   ExI.c
  18
  19 Abstract:
  20
  21   ExI configuration based on setup option
  22
  23
  24 --*/
  25
  26
  27 #include "PlatformDxe.h"
  28
  29 #define PchLpcPciCfg32(Register)  MmioRead32 (MmPciAddress (0, DEFAULT_PCI_BUS_NUMBER_PCH, PCI_DEVICE_NUMBER_PCH_LPC, 0, Register))
  30
  31 //
  32 // Procedure: GetPmcBase
  33 //
  34 // Description: This function read content of B:D:F 0:31:0, offset 44h (for
  35 // PmcBase)
  36 //
  37 // Input: None
  38 //
  39 // Output:  32 bit PmcBase
  40 //
  41 UINT32
  42 GetPmcBase (
  43   VOID
  44   )
  45 {
  46   return (PchLpcPciCfg32 (R_PCH_LPC_PMC_BASE) & B_PCH_LPC_PMC_BASE_BAR);
  47 }
  48
  49 /**
  50   Configure ExI.
  51
  52   @param ImageHandle    Pointer to the loaded image protocol for this driver
  53   @param SystemTable    Pointer to the EFI System Table
  54
  55   @retval EFI_SUCCESS   The driver initializes correctly.
  56 **/
  57 VOID
  58 InitExI (
  59   )
  60 {
  61   EFI_STATUS                  Status;
  62
  63   SYSTEM_CONFIGURATION          SystemConfiguration;
  64   UINTN       VarSize;
  65
  66   VarSize = sizeof(SYSTEM_CONFIGURATION);
  67
  68   Status = gRT->GetVariable(
  69                   L"Setup",
  70                   &gEfiNormalSetupGuid,
  71                   NULL,
  72                   &VarSize,
  73                   &SystemConfiguration
  74                   );
  75
  76   if (EFI_ERROR (Status) || VarSize != sizeof(SYSTEM_CONFIGURATION)) {
  77     //The setup variable is corrupted
  78     VarSize = sizeof(SYSTEM_CONFIGURATION);
  79     Status = gRT->GetVariable(
  80               L"SetupRecovery",
  81               &gEfiNormalSetupGuid,
  82               NULL,
  83               &VarSize,
  84               &SystemConfiguration
  85               );
  86     ASSERT_EFI_ERROR (Status);
  87   }
  88
  89   if (SystemConfiguration.ExISupport == 1) {
  90           MmioOr32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), (UINT32) BIT0+BIT1+BIT2);
  91   } else if (SystemConfiguration.ExISupport == 0) {
  92     MmioAnd32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), ~((UINT32) BIT0+BIT1+BIT2)); //clear bit 0,1,2
  93   }
  94 }