Vlv2TbltDevicePkg/PlatformDxe/ExI.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
  12   ExI.c
  13
  14 Abstract:
  15
  16   ExI configuration based on setup option
  17
  18
  19 --*/
  20
  21
  22 #include "PlatformDxe.h"
  23
  24 #define PchLpcPciCfg32(Register)  MmioRead32 (MmPciAddress (0, DEFAULT_PCI_BUS_NUMBER_PCH, PCI_DEVICE_NUMBER_PCH_LPC, 0, Register))
  25
  26 //
  27 // Procedure: GetPmcBase
  28 //
  29 // Description: This function read content of B:D:F 0:31:0, offset 44h (for
  30 // PmcBase)
  31 //
  32 // Input: None
  33 //
  34 // Output:  32 bit PmcBase
  35 //
  36 UINT32
  37 GetPmcBase (
  38   VOID
  39   )
  40 {
  41   return (PchLpcPciCfg32 (R_PCH_LPC_PMC_BASE) & B_PCH_LPC_PMC_BASE_BAR);
  42 }
  43
  44 /**
  45   Configure ExI.
  46
  47   @param ImageHandle    Pointer to the loaded image protocol for this driver
  48   @param SystemTable    Pointer to the EFI System Table
  49
  50   @retval EFI_SUCCESS   The driver initializes correctly.
  51 **/
  52 VOID
  53 InitExI (
  54   )
  55 {
  56   EFI_STATUS                  Status;
  57
  58   SYSTEM_CONFIGURATION          SystemConfiguration;
  59   UINTN       VarSize;
  60
  61   VarSize = sizeof(SYSTEM_CONFIGURATION);
  62
  63   Status = gRT->GetVariable(
  64                   L"Setup",
  65                   &gEfiNormalSetupGuid,
  66                   NULL,
  67                   &VarSize,
  68                   &SystemConfiguration
  69                   );
  70
  71   if (EFI_ERROR (Status) || VarSize != sizeof(SYSTEM_CONFIGURATION)) {
  72     //The setup variable is corrupted
  73     VarSize = sizeof(SYSTEM_CONFIGURATION);
  74     Status = gRT->GetVariable(
  75               L"SetupRecovery",
  76               &gEfiNormalSetupGuid,
  77               NULL,
  78               &VarSize,
  79               &SystemConfiguration
  80               );
  81     ASSERT_EFI_ERROR (Status);
  82   }
  83
  84   if (SystemConfiguration.ExISupport == 1) {
  85           MmioOr32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), (UINT32) BIT0+BIT1+BIT2);
  86   } else if (SystemConfiguration.ExISupport == 0) {
  87     MmioAnd32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), ~((UINT32) BIT0+BIT1+BIT2)); //clear bit 0,1,2
  88   }
  89 }