/*++

Copyright (c)  1999  - 2014, Intel Corporation. All rights reserved

  SPDX-License-Identifier: BSD-2-Clause-Patent



--*/

//
// Include files
//

#include <PiDxe.h>
#include <IndustryStandard/Acpi50.h>



//
// LPIT Definitions
//

#define EFI_ACPI_LOW_POWER_IDLE_TABLE_REVISION 0x1

//
// Ensure proper structure formats
//
#pragma pack(1)

typedef union _EFI_ACPI_LPI_STATE_FLAGS {
  struct {
    UINT32 Disabled           :1;
    UINT32 CounterUnavailable :1;
    UINT32 Reserved           :30;
  };
  UINT32 AsUlong;
} EFI_ACPI_LPI_STATE_FLAGS, *PEFI_ACPI_LPI_STATE_FLAGS;

// Only Mwait LPI here:

typedef struct _EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR {
  UINT32 Type;        // offset: 0
  UINT32 Length;      // offset: 4
  UINT16 UniqueId;    // offset: 8
  UINT8 Reserved[2];  // offset: 9
  EFI_ACPI_LPI_STATE_FLAGS Flags; // offset: 12
  EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE EntryTrigger; // offset: 16
  UINT32 Residency;   // offset: 28
  UINT32 Latency;     // offset: 32
  EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE ResidencyCounter; // offset: 36
  UINT64 ResidencyCounterFrequency; //offset: 48
} EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR;


//
// Defines for LPIT table, some are VLV specific
//


// signature "LPIT"
#define EFI_ACPI_LOW_POWER_IDLE_TABLE_SIGNATURE  0x5449504c

#define EFI_ACPI_OEM_LPIT_REVISION                      0x00000000

#define EFI_ACPI_LOW_POWER_IDLE_MWAIT_TYPE    0x0
#define EFI_ACPI_LOW_POWER_IDLE_DEFAULT_FLAG  0x0
#define EFI_ACPI_LOW_POWER_IDLE_RES_FREQ_8K   0x8000    // 32768

//
// LPI state count (4 on VLV: S0ir, S0i1, S0i2, S0i3)
//

#define EFI_ACPI_VLV_LPI_STATE_COUNT          0x4

//
// LPI TRIGGER (HW C7 on VLV),
// TOFIX!!!
//
#define EFI_ACPI_VLV_LPI_TRIGGER {0x7F,0x1,0x2,0x0,0x64}

//
// LPI residency counter (MMIO)
//
#define  EFI_ACPI_VLV_LPI_RES_COUNTER0   {0x0,32,0x0,0x03,0xFED03080}
#define  EFI_ACPI_VLV_LPI_RES_COUNTER1   {0x0,32,0x0,0x03,0xFED03084}
#define  EFI_ACPI_VLV_LPI_RES_COUNTER2   {0x0,32,0x0,0x03,0xFED03088}
#define  EFI_ACPI_VLV_LPI_RES_COUNTER3   {0x0,32,0x0,0x03,0xFED0308C}

//
// LPI break-even residency in us - all match S0i3 residency
// Residency estimate: Latency x 3
//
#define  EFI_ACPI_VLV_LPI_MIN_RES0   15000
#define  EFI_ACPI_VLV_LPI_MIN_RES1   15000
#define  EFI_ACPI_VLV_LPI_MIN_RES2   15000
#define  EFI_ACPI_VLV_LPI_MIN_RES3   15000

//
// LPI latency in us - all match S0i3 latency
//
#define  EFI_ACPI_VLV_LPI_LATENCY0   5000
#define  EFI_ACPI_VLV_LPI_LATENCY1   5000
#define  EFI_ACPI_VLV_LPI_LATENCY2   5000
#define  EFI_ACPI_VLV_LPI_LATENCY3   5000


//
// LPI ID
//
#define  EFI_ACPI_VLV_LPI_UNIQUE_ID0   0
#define  EFI_ACPI_VLV_LPI_UNIQUE_ID1   1
#define  EFI_ACPI_VLV_LPI_UNIQUE_ID2   2
#define  EFI_ACPI_VLV_LPI_UNIQUE_ID3   3

//
//  LPI ACPI table header
//


typedef struct _EFI_ACPI_LOW_POWER_IDLE_TABLE {
  EFI_ACPI_DESCRIPTION_HEADER             Header;
  EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR     LpiStates[EFI_ACPI_VLV_LPI_STATE_COUNT];
} EFI_ACPI_LOW_POWER_IDLE_TABLE;

#pragma pack()

EFI_ACPI_LOW_POWER_IDLE_TABLE Lpit = {

  //
  // Header
  //


  EFI_ACPI_LOW_POWER_IDLE_TABLE_SIGNATURE,
  sizeof (EFI_ACPI_LOW_POWER_IDLE_TABLE),
  EFI_ACPI_LOW_POWER_IDLE_TABLE_REVISION ,

  //
  // Checksum will be updated at runtime
  //
  0x00,

  //
  // It is expected that these values will be updated at runtime
  //
  ' ', ' ', ' ', ' ', ' ', ' ',

  0,
  EFI_ACPI_OEM_LPIT_REVISION,
  0,
  0,



  //
  // Descriptor
  //
  {
    {
      EFI_ACPI_LOW_POWER_IDLE_MWAIT_TYPE,
      sizeof(EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR),
      EFI_ACPI_VLV_LPI_UNIQUE_ID0,
      {0,0},
      {EFI_ACPI_LOW_POWER_IDLE_DEFAULT_FLAG},   // Flags
      EFI_ACPI_VLV_LPI_TRIGGER,  //EntryTrigger
      EFI_ACPI_VLV_LPI_MIN_RES0, //Residency
      EFI_ACPI_VLV_LPI_LATENCY0, //Latency
      EFI_ACPI_VLV_LPI_RES_COUNTER0, //ResidencyCounter
      EFI_ACPI_LOW_POWER_IDLE_RES_FREQ_8K //Residency counter frequency
    },
    {
      EFI_ACPI_LOW_POWER_IDLE_MWAIT_TYPE,
      sizeof(EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR),
      EFI_ACPI_VLV_LPI_UNIQUE_ID1,
      {0,0},
      {EFI_ACPI_LOW_POWER_IDLE_DEFAULT_FLAG},   // Flags
      EFI_ACPI_VLV_LPI_TRIGGER,  //EntryTrigger
      EFI_ACPI_VLV_LPI_MIN_RES1, //Residency
      EFI_ACPI_VLV_LPI_LATENCY1, //Latency
      EFI_ACPI_VLV_LPI_RES_COUNTER1, //ResidencyCounter
      EFI_ACPI_LOW_POWER_IDLE_RES_FREQ_8K //Residency counter frequency
    },
    {
      EFI_ACPI_LOW_POWER_IDLE_MWAIT_TYPE,
      sizeof(EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR),
      EFI_ACPI_VLV_LPI_UNIQUE_ID2,
      {0,0},
      {EFI_ACPI_LOW_POWER_IDLE_DEFAULT_FLAG},   // Flags
      EFI_ACPI_VLV_LPI_TRIGGER,  //EntryTrigger
      EFI_ACPI_VLV_LPI_MIN_RES2, //Residency
      EFI_ACPI_VLV_LPI_LATENCY2, //Latency
      EFI_ACPI_VLV_LPI_RES_COUNTER2, //ResidencyCounter
      EFI_ACPI_LOW_POWER_IDLE_RES_FREQ_8K //Residency counter frequency
    },
    {
      EFI_ACPI_LOW_POWER_IDLE_MWAIT_TYPE,
      sizeof(EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR),
      EFI_ACPI_VLV_LPI_UNIQUE_ID3,
      {0,0},
      {EFI_ACPI_LOW_POWER_IDLE_DEFAULT_FLAG},   // Flags
      EFI_ACPI_VLV_LPI_TRIGGER,  //EntryTrigger
      EFI_ACPI_VLV_LPI_MIN_RES3, //Residency
      EFI_ACPI_VLV_LPI_LATENCY3, //Latency
      EFI_ACPI_VLV_LPI_RES_COUNTER3, //ResidencyCounter
      EFI_ACPI_LOW_POWER_IDLE_RES_FREQ_8K //Residency counter frequency
    }
  }

};


VOID*
ReferenceAcpiTable (
  VOID
  )
{
  //
  // Reference the table being generated to prevent the optimizer from
  // removing the data structure from the executable
  //
  return (VOID*)&Lpit;
}