OvmfPkg: extract some bits and port offsets common to Q35 and I440FX

[mirror_edk2.git] / OvmfPkg / Library / AcpiTimerLib / BaseAcpiTimerLib.c

/** @file\r
  Provide constructor and GetTick for Base instance of ACPI Timer Library\r
\r
  Copyright (C) 2014, Gabriel L. Somlo <somlo@cmu.edu>\r
\r
  This program and the accompanying materials are licensed and made\r
  available under the terms and conditions of the BSD License which\r
  accompanies this distribution.   The full text of the license may\r
  be found at http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
**/\r
\r
#include <Library/DebugLib.h>\r
#include <Library/IoLib.h>\r
#include <Library/PciLib.h>\r
#include <Library/PcdLib.h>\r
#include <OvmfPlatforms.h>\r
\r
//\r
// Cached ACPI Timer IO Address\r
//\r
STATIC UINT32 mAcpiTimerIoAddr;\r
\r
/**\r
  The constructor function caches the ACPI tick counter address, and,\r
  if necessary, enables ACPI IO space.\r
\r
  @retval EFI_SUCCESS   The constructor always returns RETURN_SUCCESS.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
AcpiTimerLibConstructor (\r
  VOID\r
  )\r
{\r
  UINT16 HostBridgeDevId;\r
  UINTN Pmba;\r
  UINTN AcpiCtlReg;\r
  UINT8 AcpiEnBit;\r
\r
  //\r
  // Query Host Bridge DID to determine platform type\r
  //\r
  HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);\r
  switch (HostBridgeDevId) {\r
    case INTEL_82441_DEVICE_ID:\r
      Pmba       = POWER_MGMT_REGISTER_PIIX4 (PIIX4_PMBA);\r
      AcpiCtlReg = POWER_MGMT_REGISTER_PIIX4 (PIIX4_PMREGMISC);\r
      AcpiEnBit  = PIIX4_PMREGMISC_PMIOSE;\r
      break;\r
    case INTEL_Q35_MCH_DEVICE_ID:\r
      Pmba       = POWER_MGMT_REGISTER_Q35 (ICH9_PMBASE);\r
      AcpiCtlReg = POWER_MGMT_REGISTER_Q35 (ICH9_ACPI_CNTL);\r
      AcpiEnBit  = ICH9_ACPI_CNTL_ACPI_EN;\r
      break;\r
    default:\r
      DEBUG ((EFI_D_ERROR, "%a: Unknown Host Bridge Device ID: 0x%04x\n",\r
        __FUNCTION__, HostBridgeDevId));\r
      ASSERT (FALSE);\r
      return RETURN_UNSUPPORTED;\r
  }\r
\r
  mAcpiTimerIoAddr = (PciRead32 (Pmba) & ~PMBA_RTE) + ACPI_TIMER_OFFSET;\r
\r
  //\r
  // Check to see if the Power Management Base Address is already enabled\r
  //\r
  if ((PciRead8 (AcpiCtlReg) & AcpiEnBit) == 0) {\r
    //\r
    // If the Power Management Base Address is not programmed,\r
    // then program the Power Management Base Address from a PCD.\r
    //\r
    PciAndThenOr32 (Pmba, (UINT32) ~0xFFC0, PcdGet16 (PcdAcpiPmBaseAddress));\r
\r
    //\r
    // Enable PMBA I/O port decodes\r
    //\r
    PciOr8 (AcpiCtlReg, AcpiEnBit);\r
  }\r
\r
  return RETURN_SUCCESS;\r
}\r
\r
/**\r
  Internal function to read the current tick counter of ACPI.\r
\r
  Read the current ACPI tick counter using the counter address cached\r
  by this instance's constructor.\r
\r
  @return The tick counter read.\r
\r
**/\r
UINT32\r
InternalAcpiGetTimerTick (\r
  VOID\r
  )\r
{\r
  //\r
  //   Return the current ACPI timer value.\r
  //\r
  return IoRead32 (mAcpiTimerIoAddr);\r
}\r