audk/Vlv2TbltDevicePkg/Library/PlatformCmosLib/PlatformCmosLib.c

/*++

Copyright (c) 2010 - 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:

  CmosTable.h

Abstract:

--*/

#include <Base.h>
#include <Library/IoLib.h>
#include <Library/PlatformCmosLib.h>
#include "CmosMap.h"
#include <PchAccess.h>
#include "PlatformBaseAddresses.h"

#define DEFAULT_VALUE          0
#define  DEFAULT_ATTRIBUTES     0
#define  EXCLUDE_FROM_CHECKSUM   CMOS_ATTRIBUTE_EXCLUDE_FROM_CHECKSUM

#define CMOS_DEBUG_PRINT_LEVEL_DEFAULT_VALUE      0x46   // EFI_D_WARN|EFI_D_INFO|EFI_D_LOAD
#define CMOS_DEBUG_PRINT_LEVEL_3_DEFAULT_VALUE    0x80   // EFI_D_ERROR

//
// Add the CMOS entry below
//
CMOS_ENTRY mCmosTable[] = {
{ CPU_HT_POLICY, CPU_HT_POLICY_ENABLED, EXCLUDE_FROM_CHECKSUM },
{ TPM_POLICY, TPM_POLICY_ENABLED, DEFAULT_ATTRIBUTES },
{ CMOS_LCDPANELTYPE_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_LCDPANELSCALING_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_IGDBOOTTYPE_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_BACKLIGHT_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_LFP_PANEL_COLOR_DEPTH_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_EDP_ACTIVE_LFP_CONFIG_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_PRIMARY_DISPLAY_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_IGD_DISPLAY_PIPE_B_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_SDVOPANELTYPE_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_PLATFORM_RESET_OS, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_CPU_BSP_SELECT, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_CPU_RATIO_OFFSET, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_ICH_PORT80_OFFSET, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ CMOS_MAXRATIO_CONFIG_REG, DEFAULT_VALUE, DEFAULT_ATTRIBUTES },
{ RTC_ADDRESS_CENTURY, RTC_ADDRESS_CENTURY_DEFAULT, CMOS_ATTRIBUTE_EXCLUDE_FROM_CHECKSUM },
{ CMOS_POST_CODE_BREAK_REG, DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
{ CMOS_POST_CODE_BREAK_1_REG, DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
{ CMOS_POST_CODE_BREAK_2_REG, DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
{ CMOS_POST_CODE_BREAK_3_REG, DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
{ CMOS_DEBUG_PRINT_LEVEL_REG, CMOS_DEBUG_PRINT_LEVEL_DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
{ CMOS_DEBUG_PRINT_LEVEL_1_REG, DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
{ CMOS_DEBUG_PRINT_LEVEL_2_REG, DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
{ CMOS_DEBUG_PRINT_LEVEL_3_REG, CMOS_DEBUG_PRINT_LEVEL_3_DEFAULT_VALUE, EXCLUDE_FROM_CHECKSUM },
};

/**
  Funtion to return platform CMOS entry.

  @param [out]  CmosEntry  Platform CMOS entry.

  @param [out]  CmosEntryCount Number of platform CMOS entry.

  @return Status.
**/
RETURN_STATUS
EFIAPI
GetPlatformCmosEntry (
  OUT CMOS_ENTRY  **CmosEntry,
  OUT UINTN       *CmosEntryCount
  )
{
  *CmosEntry = mCmosTable;
  *CmosEntryCount = sizeof(mCmosTable)/sizeof(mCmosTable[0]);
  return RETURN_SUCCESS;
}

/**
  Function to check if Battery lost or CMOS cleared.

  @reval TRUE  Battery is always present.
  @reval FALSE CMOS is cleared.
**/
BOOLEAN
EFIAPI
CheckCmosBatteryStatus (
  VOID
  )
{
  //
  // Check if the CMOS battery is present
  // Checks RTC_PWR_STS bit in the GEN_PMCON_1 register
  //

  if ((MmioRead8 (PMC_BASE_ADDRESS + R_PCH_PMC_GEN_PMCON_1) & B_PCH_PMC_GEN_PMCON_RTC_PWR_STS) == 0) {
    return TRUE;
  } else {
    return FALSE;
  }
}