Vlv2TbltDevicePkg/Library/PchPlatformLib/PchPlatformLibrary.c

   1 /**
   2
   3 Copyright (c) 2012  - 2014, Intel Corporation. All rights reserved
   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   @file
  15   PchPlatformLib.c
  16
  17   @brief
  18   PCH Platform Lib implementation.
  19
  20 **/
  21
  22 #include "PchPlatformLibrary.h"
  23
  24 //
  25 // Silicon Steppings
  26 //
  27 /**
  28   Return Pch stepping type
  29
  30   @param[in] None
  31
  32   @retval PCH_STEPPING            Pch stepping type
  33
  34 **/
  35 PCH_STEPPING
  36 EFIAPI
  37 PchStepping (
  38   VOID
  39   )
  40 {
  41   UINT8 RevId;
  42
  43   RevId = MmioRead8 (
  44           MmPciAddress (0,
  45             DEFAULT_PCI_BUS_NUMBER_PCH,
  46             PCI_DEVICE_NUMBER_PCH_LPC,
  47             PCI_FUNCTION_NUMBER_PCH_LPC,
  48             R_PCH_LPC_RID_CC)
  49           );
  50
  51   switch (RevId) {
  52     case V_PCH_LPC_RID_0:
  53     case V_PCH_LPC_RID_1:
  54       return PchA0;
  55       break;
  56
  57     case V_PCH_LPC_RID_2:
  58     case V_PCH_LPC_RID_3:
  59       return PchA1;
  60       break;
  61
  62     case V_PCH_LPC_RID_4:
  63     case V_PCH_LPC_RID_5:
  64       return PchB0;
  65       break;
  66
  67     case V_PCH_LPC_RID_6:
  68     case V_PCH_LPC_RID_7:
  69       return PchB1;
  70       break;
  71
  72     case V_PCH_LPC_RID_8:
  73     case V_PCH_LPC_RID_9:
  74       return PchB2;
  75       break;
  76
  77     case V_PCH_LPC_RID_A:
  78     case V_PCH_LPC_RID_B:
  79       return PchB3;
  80       break;
  81
  82     case V_PCH_LPC_RID_C:
  83     case V_PCH_LPC_RID_D:
  84       return PchC0;
  85       break;
  86
  87     default:
  88       return PchSteppingMax;
  89       break;
  90
  91   }
  92 }
  93
  94 /**
  95   Determine if PCH is supported
  96
  97   @param[in] None
  98
  99   @retval TRUE                    PCH is supported
 100   @retval FALSE                   PCH is not supported
 101
 102 **/
 103 BOOLEAN
 104 IsPchSupported (
 105   VOID
 106   )
 107 {
 108   UINT32  Identifiers;
 109   UINT16  PcuVendorId;
 110   UINT16  PcuDeviceId;
 111
 112   Identifiers = MmioRead32 (
 113                   MmPciAddress (0,
 114                   DEFAULT_PCI_BUS_NUMBER_PCH,
 115                   PCI_DEVICE_NUMBER_PCH_LPC,
 116                   PCI_FUNCTION_NUMBER_PCH_LPC,
 117                   R_PCH_LPC_REG_ID)
 118                 );
 119
 120   PcuDeviceId = (UINT16) ((Identifiers & B_PCH_LPC_DEVICE_ID) >> 16);
 121   PcuVendorId = (UINT16) (Identifiers & B_PCH_LPC_VENDOR_ID);
 122
 123   //
 124   // Verify that this is a supported chipset
 125   //
 126   if (PcuVendorId != (UINT16) V_PCH_LPC_VENDOR_ID || !IS_PCH_VLV_LPC_DEVICE_ID (PcuDeviceId)) {
 127     DEBUG ((EFI_D_ERROR, "VLV SC code doesn't support the PcuDeviceId: 0x%04x!\n", PcuDeviceId));
 128     return FALSE;
 129   }
 130   return TRUE;
 131 }