/** @file
  This file implement UEFI driver for IDE Bus which includes device identification,
  Child device(Disk, CDROM, etc) enumeration and child handler installation, and
  driver stop.

  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Revision Reference:
  This module is modified from DXE\IDE module for Ide Contriller Init support

**/

#include "IdeBus.h"

#define PCI_CLASS_MASS_STORAGE  0x01
#define PCI_SUB_CLASS_IDE       0x01


//
// IDE Bus Driver Binding Protocol Instance
//
EFI_DRIVER_BINDING_PROTOCOL gIDEBusDriverBinding = {
  IDEBusDriverBindingSupported,
  IDEBusDriverBindingStart,
  IDEBusDriverBindingStop,
  0xa,
  NULL,
  NULL
};
/**
  Deregister an IDE device and free resources

  @param  This Protocol instance pointer.
  @param  Controller Ide device handle
  @param  Handle Handle of device to deregister driver on

  @retval EFI_SUCCESS  Deregiter a specific IDE device successfully


**/
EFI_STATUS
DeRegisterIdeDevice (
  IN  EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN  EFI_HANDLE                     Controller,
  IN  EFI_HANDLE                     Handle
  )
{
  EFI_STATUS            Status;
  EFI_BLOCK_IO_PROTOCOL *BlkIo;
  IDE_BLK_IO_DEV        *IdeBlkIoDevice;
  EFI_PCI_IO_PROTOCOL   *PciIo;
  UINTN                 Index;

  Status = gBS->OpenProtocol (
                  Handle,
                  &gEfiBlockIoProtocolGuid,
                  (VOID **) &BlkIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  IdeBlkIoDevice = IDE_BLOCK_IO_DEV_FROM_THIS (BlkIo);

  //
  // Report Status code: Device disabled
  //
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_PROGRESS_CODE,
    (EFI_IO_BUS_ATA_ATAPI | EFI_P_PC_DISABLE),
    IdeBlkIoDevice->DevicePath
    );

  //
  // Close the child handle
  //
  Status = gBS->CloseProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  This->DriverBindingHandle,
                  Handle
                  );

  Status = gBS->UninstallMultipleProtocolInterfaces (
                  Handle,
                  &gEfiDevicePathProtocolGuid,
                  IdeBlkIoDevice->DevicePath,
                  &gEfiBlockIoProtocolGuid,
                  &IdeBlkIoDevice->BlkIo,
                  &gEfiDiskInfoProtocolGuid,
                  &IdeBlkIoDevice->DiskInfo,
                  NULL
                  );

  if (EFI_ERROR (Status)) {
    gBS->OpenProtocol (
          Controller,
          &gEfiPciIoProtocolGuid,
          (VOID **) &PciIo,
          This->DriverBindingHandle,
          Handle,
          EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
          );
    return Status;
  }

  //
  // Release allocated resources
  //
  Index = IdeBlkIoDevice->Channel * 2 + IdeBlkIoDevice->Device;
  if (Index < MAX_IDE_DEVICE) {
    IdeBlkIoDevice->IdeBusDriverPrivateData->HaveScannedDevice[Index] = FALSE;
  }
  ReleaseIdeResources (IdeBlkIoDevice);

  return EFI_SUCCESS;
}
/**
  Supported function of Driver Binding protocol for this driver.

  @param This                A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
  @param ControllerHandle    The handle of the controller to test.
  @param RemainingDevicePath A pointer to the remaining portion of a device path.

  @retval  EFI_SUCCESS Driver loaded.
  @retval  other       Driver not loaded.

**/
EFI_STATUS
EFIAPI
IDEBusDriverBindingSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS                        Status;
  EFI_DEVICE_PATH_PROTOCOL          *ParentDevicePath;
  EFI_DEV_PATH                      *Node;
  EFI_IDE_CONTROLLER_INIT_PROTOCOL  *IdeInit;
  EFI_PCI_IO_PROTOCOL               *PciIo;
  PCI_TYPE00                        PciData;

  if (RemainingDevicePath != NULL) {
    Node = (EFI_DEV_PATH *) RemainingDevicePath;
    //
    // Check if RemainingDevicePath is the End of Device Path Node,
    // if yes, go on checking other conditions
    //
    if (!IsDevicePathEnd (Node)) {
      //
      // If RemainingDevicePath isn't the End of Device Path Node,
      // check its validation
      //
      if (Node->DevPath.Type != MESSAGING_DEVICE_PATH ||
          Node->DevPath.SubType != MSG_ATAPI_DP ||
          DevicePathNodeLength(&Node->DevPath) != sizeof(ATAPI_DEVICE_PATH)) {
        return EFI_UNSUPPORTED;
      }
    }
  }

  //
  // Verify the Ide Controller Init Protocol, which installed by the
  // IdeController module.
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiIdeControllerInitProtocolGuid,
                  (VOID **) &IdeInit,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );

  if (Status == EFI_ALREADY_STARTED) {
    return EFI_SUCCESS;
  }

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Close the I/O Abstraction(s) used to perform the supported test
  //
  gBS->CloseProtocol (
        Controller,
        &gEfiIdeControllerInitProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  //
  // Open the EFI Device Path protocol needed to perform the supported test
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiDevicePathProtocolGuid,
                  (VOID **) &ParentDevicePath,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (Status == EFI_ALREADY_STARTED) {
    return EFI_SUCCESS;
  }

  //
  // Close protocol, don't use device path protocol in the Support() function
  //
  gBS->CloseProtocol (
        Controller,
        &gEfiDevicePathProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  //
  // Get the EfiPciIoProtocol
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Now further check the PCI header: Base class (offset 0x0B) and
  // Sub Class (offset 0x0A). This controller should be an IDE controller
  //
  Status = PciIo->Pci.Read (
                        PciIo,
                        EfiPciIoWidthUint8,
                        0,
                        sizeof (PciData),
                        &PciData
                        );

  if (!EFI_ERROR (Status)) {
    //
    // Examine if it is IDE mode by class code
    //
    if ((PciData.Hdr.ClassCode[2] != PCI_CLASS_MASS_STORAGE) || (PciData.Hdr.ClassCode[1] != PCI_SUB_CLASS_IDE)) {
      Status = EFI_UNSUPPORTED;
    } else {
      Status = EFI_SUCCESS;
    }
  }

  return Status;
}


/**
  Start function of Driver binding protocol which start this driver on Controller
  by detecting all disks and installing BlockIo protocol on them.

  @param  This                Protocol instance pointer.
  @param  Controller          Handle of device to bind driver to.
  @param  RemainingDevicePath produce all possible children.

  @retval  EFI_SUCCESS         This driver is added to ControllerHandle.
  @retval  EFI_ALREADY_STARTED This driver is already running on ControllerHandle.
  @retval  other               This driver does not support this device.

**/
EFI_STATUS
EFIAPI
IDEBusDriverBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS                        Status;
  EFI_STATUS                        SavedStatus;
  EFI_PCI_IO_PROTOCOL               *PciIo;
  EFI_DEVICE_PATH_PROTOCOL          *ParentDevicePath;
  EFI_DEV_PATH                      *Node;
  UINT8                             IdeChannel;
  UINT8                             BeginningIdeChannel;
  UINT8                             EndIdeChannel;
  UINT8                             IdeDevice;
  UINT8                             BeginningIdeDevice;
  UINT8                             EndIdeDevice;
  IDE_BLK_IO_DEV                    *IdeBlkIoDevice[IdeMaxChannel][IdeMaxDevice];
  IDE_BLK_IO_DEV                    *IdeBlkIoDevicePtr;
  IDE_REGISTERS_BASE_ADDR           IdeRegsBaseAddr[IdeMaxChannel];
  ATA_TRANSFER_MODE                 TransferMode;
  ATA_DRIVE_PARMS                   DriveParameters;
  EFI_DEV_PATH                      NewNode;
  UINT8                             ConfigurationOptions;
  UINT16                            CommandBlockBaseAddr;
  UINT16                            ControlBlockBaseAddr;
  UINTN                             DataSize;
  IDE_BUS_DRIVER_PRIVATE_DATA       *IdeBusDriverPrivateData;
  UINT64                            Supports;

  //
  // Local variables declaration for IdeControllerInit support
  //
  EFI_IDE_CONTROLLER_INIT_PROTOCOL  *IdeInit;
  BOOLEAN                           EnumAll;
  BOOLEAN                           ChannelEnabled;
  UINT8                             MaxDevices;
  EFI_IDENTIFY_DATA                 IdentifyData;
  EFI_ATA_COLLECTIVE_MODE           *SupportedModes;

  IdeBusDriverPrivateData = NULL;
  SupportedModes          = NULL;

  //
  // Perform IdeBus initialization
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiDevicePathProtocolGuid,
                  (VOID **) &ParentDevicePath,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if ((EFI_ERROR (Status)) && (Status != EFI_ALREADY_STARTED)) {
    return Status;
  }

  //
  // Now open the IDE_CONTROLLER_INIT protocol. Step7.1
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiIdeControllerInitProtocolGuid,
                  (VOID **) &IdeInit,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );

  //
  // The following OpenProtocol function with _GET_PROTOCOL attribute and
  // will not return EFI_ALREADY_STARTED, so save it for now
  //
  SavedStatus = Status;

  if ((EFI_ERROR (Status)) && (Status != EFI_ALREADY_STARTED)) {
    DEBUG ((EFI_D_ERROR, "Open Init, Status=%x", Status));
    //
    // open protocol is not SUCCESS or not ALREADY_STARTED, error exit
    //
    goto ErrorExit;
  }

  //
  // Save Enumall. Step7.2
  //
  EnumAll       = IdeInit->EnumAll;

  //
  // Consume PCI I/O protocol. Note that the OpenProtocol with _GET_PROTOCOL
  // attribute will not return EFI_ALREADY_STARTED
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    DEBUG ((EFI_D_ERROR, "Open PciIo, Status=%x", Status));
    goto ErrorExit;
  }

  //
  // We must check EFI_ALREADY_STARTED because many ATAPI devices are removable
  //
  if (SavedStatus != EFI_ALREADY_STARTED) {
    IdeBusDriverPrivateData = AllocatePool (sizeof (IDE_BUS_DRIVER_PRIVATE_DATA));
    if (IdeBusDriverPrivateData == NULL) {
      Status = EFI_OUT_OF_RESOURCES;
      goto ErrorExit;
    }

    ZeroMem (IdeBusDriverPrivateData, sizeof (IDE_BUS_DRIVER_PRIVATE_DATA));
    Status = gBS->InstallMultipleProtocolInterfaces (
                    &Controller,
                    &gEfiCallerIdGuid,
                    IdeBusDriverPrivateData,
                    NULL
                    );
    if (EFI_ERROR (Status)) {
      goto ErrorExit;
    }

  } else {
    Status = gBS->OpenProtocol (
                    Controller,
                    &gEfiCallerIdGuid,
                    (VOID **) &IdeBusDriverPrivateData,
                    This->DriverBindingHandle,
                    Controller,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
    if (EFI_ERROR (Status)) {
      IdeBusDriverPrivateData = NULL;
      goto ErrorExit;
    }
  }

  Status = PciIo->Attributes (
                    PciIo,
                    EfiPciIoAttributeOperationSupported,
                    0,
                    &Supports
                    );
  if (!EFI_ERROR (Status)) {
    Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;
    Status = PciIo->Attributes (
                      PciIo,
                      EfiPciIoAttributeOperationEnable,
                      Supports,
                      NULL
                      );
  }

  if (EFI_ERROR (Status)) {
    goto ErrorExit;
  }

  //
  // Read the environment variable that contains the IDEBus Driver's
  // Config options that were set by the Driver Configuration Protocol
  //
  DataSize = sizeof (ConfigurationOptions);
  Status = gRT->GetVariable (
                  (CHAR16 *) L"Configuration",
                  &gEfiCallerIdGuid,
                  NULL,
                  &DataSize,
                  &ConfigurationOptions
                  );
  if (EFI_ERROR (Status)) {
    ConfigurationOptions = 0x0f;
  }

   if (EnumAll || RemainingDevicePath == NULL) {
    //
    // If IdeInit->EnumAll is TRUE or RemainingDevicePath is NULL,
    // must enumerate all IDE devices anyway
    //
    BeginningIdeChannel = IdePrimary;
    EndIdeChannel       = IdeSecondary;
    BeginningIdeDevice  = IdeMaster;
    EndIdeDevice        = IdeSlave;

  } else if (!IsDevicePathEnd (RemainingDevicePath)) {
    //
    // If RemainingDevicePath isn't the End of Device Path Node,
    // only scan the specified device by RemainingDevicePath
    //
    Node                = (EFI_DEV_PATH *) RemainingDevicePath;
    BeginningIdeChannel = Node->Atapi.PrimarySecondary;
    EndIdeChannel       = BeginningIdeChannel;
    BeginningIdeDevice  = Node->Atapi.SlaveMaster;
    EndIdeDevice        = BeginningIdeDevice;
    if (BeginningIdeChannel >= IdeMaxChannel || EndIdeChannel >= IdeMaxChannel) {
      Status = EFI_INVALID_PARAMETER;
      goto ErrorExit;
    }
    if (BeginningIdeDevice >= IdeMaxDevice|| EndIdeDevice >= IdeMaxDevice) {
      Status = EFI_INVALID_PARAMETER;
      goto ErrorExit;
    }

  } else {
    //
    // If RemainingDevicePath is the End of Device Path Node,
    // skip enumerate any device and return EFI_SUCESSS
    //
    BeginningIdeChannel = IdeMaxChannel;
    EndIdeChannel       = IdeMaxChannel - 1;
    BeginningIdeDevice  = IdeMaxDevice;
    EndIdeDevice        = IdeMaxDevice - 1;
  }

  //
  // Obtain IDE IO port registers' base addresses
  //
  Status = GetIdeRegistersBaseAddr (PciIo, IdeRegsBaseAddr);
  if (EFI_ERROR (Status)) {
    goto ErrorExit;
  }

  //
  // Report status code: begin IdeBus initialization
  //
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_PROGRESS_CODE,
    (EFI_IO_BUS_ATA_ATAPI | EFI_IOB_PC_RESET),
    ParentDevicePath
    );

  //
  // Strictly follow the enumeration based on IDE_CONTROLLER_INIT protocol
  //
  for (IdeChannel = BeginningIdeChannel; IdeChannel <= EndIdeChannel; IdeChannel++) {

    IdeInit->NotifyPhase (IdeInit, EfiIdeBeforeChannelEnumeration, IdeChannel);

    //
    // now obtain channel information fron IdeControllerInit protocol. Step9
    //
    Status = IdeInit->GetChannelInfo (
                        IdeInit,
                        IdeChannel,
                        &ChannelEnabled,
                        &MaxDevices
                        );
    if (EFI_ERROR (Status)) {
      DEBUG ((EFI_D_ERROR, "[GetChannel, Status=%x]", Status));
      continue;
    }

    if (!ChannelEnabled) {
      continue;
    }

    EndIdeDevice = (UINT8) MIN ((MaxDevices - 1), EndIdeDevice);
    ASSERT (EndIdeDevice < IdeMaxDevice);
    //
    // Now inform the IDE Controller Init Module. Sept10
    //
    IdeInit->NotifyPhase (IdeInit, EfiIdeBeforeChannelReset, IdeChannel);

    //
    // No reset channel function implemented. Sept11
    //
    IdeInit->NotifyPhase (IdeInit, EfiIdeAfterChannelReset, IdeChannel);

    //
    // Step13
    //
    IdeInit->NotifyPhase (
              IdeInit,
              EfiIdeBusBeforeDevicePresenceDetection,
              IdeChannel
              );

    //
    // Prepare to detect IDE device of this channel
    //
    InitializeIDEChannelData ();

    //
    // -- 1st inner loop --- Master/Slave ------------  Step14
    //
    for (IdeDevice = BeginningIdeDevice; IdeDevice <= EndIdeDevice; IdeDevice++) {
      //
      // Check whether the configuration options allow this device
      //
      if ((ConfigurationOptions & (1 << (IdeChannel * 2 + IdeDevice))) == 0) {
        continue;
      }

      //
      // The device has been scanned in another Start(), No need to scan it again
      // for perf optimization.
      //
      if (IdeBusDriverPrivateData->HaveScannedDevice[IdeChannel * 2 + IdeDevice]) {
        continue;
      }

      //
      // create child handle for the detected device.
      //
      IdeBlkIoDevice[IdeChannel][IdeDevice] = AllocatePool (sizeof (IDE_BLK_IO_DEV));
      if (IdeBlkIoDevice[IdeChannel][IdeDevice] == NULL) {
        continue;
      }

      IdeBlkIoDevicePtr = IdeBlkIoDevice[IdeChannel][IdeDevice];

      ZeroMem (IdeBlkIoDevicePtr, sizeof (IDE_BLK_IO_DEV));

      IdeBlkIoDevicePtr->Signature  = IDE_BLK_IO_DEV_SIGNATURE;
      IdeBlkIoDevicePtr->Channel    = (EFI_IDE_CHANNEL) IdeChannel;
      IdeBlkIoDevicePtr->Device     = (EFI_IDE_DEVICE) IdeDevice;

      //
      // initialize Block IO interface's Media pointer
      //
      IdeBlkIoDevicePtr->BlkIo.Media = &IdeBlkIoDevicePtr->BlkMedia;

      //
      // Initialize IDE IO port addresses, including Command Block registers
      // and Control Block registers
      //
      IdeBlkIoDevicePtr->IoPort = AllocatePool (sizeof (IDE_BASE_REGISTERS));
      if (IdeBlkIoDevicePtr->IoPort == NULL) {
        continue;
      }

      ZeroMem (IdeBlkIoDevicePtr->IoPort, sizeof (IDE_BASE_REGISTERS));
      CommandBlockBaseAddr = IdeRegsBaseAddr[IdeChannel].CommandBlockBaseAddr;
      ControlBlockBaseAddr = IdeRegsBaseAddr[IdeChannel].ControlBlockBaseAddr;

      IdeBlkIoDevicePtr->IoPort->Data = CommandBlockBaseAddr;
      (*(UINT16 *) &IdeBlkIoDevicePtr->IoPort->Reg1) = (UINT16) (CommandBlockBaseAddr + 0x01);
      IdeBlkIoDevicePtr->IoPort->SectorCount = (UINT16) (CommandBlockBaseAddr + 0x02);
      IdeBlkIoDevicePtr->IoPort->SectorNumber = (UINT16) (CommandBlockBaseAddr + 0x03);
      IdeBlkIoDevicePtr->IoPort->CylinderLsb = (UINT16) (CommandBlockBaseAddr + 0x04);
      IdeBlkIoDevicePtr->IoPort->CylinderMsb = (UINT16) (CommandBlockBaseAddr + 0x05);
      IdeBlkIoDevicePtr->IoPort->Head = (UINT16) (CommandBlockBaseAddr + 0x06);
      (*(UINT16 *) &IdeBlkIoDevicePtr->IoPort->Reg) = (UINT16) (CommandBlockBaseAddr + 0x07);

      (*(UINT16 *) &IdeBlkIoDevicePtr->IoPort->Alt) = ControlBlockBaseAddr;
      IdeBlkIoDevicePtr->IoPort->DriveAddress = (UINT16) (ControlBlockBaseAddr + 0x01);

      IdeBlkIoDevicePtr->IoPort->MasterSlave = (UINT16) ((IdeDevice == IdeMaster) ? 1 : 0);

      IdeBlkIoDevicePtr->PciIo = PciIo;
      IdeBlkIoDevicePtr->IdeBusDriverPrivateData = IdeBusDriverPrivateData;
      IdeBlkIoDevicePtr->IoPort->BusMasterBaseAddr = IdeRegsBaseAddr[IdeChannel].BusMasterBaseAddr;

      //
      // Report Status code: is about to detect IDE drive
      //
      REPORT_STATUS_CODE_EX (
        EFI_PROGRESS_CODE,
        (EFI_IO_BUS_ATA_ATAPI | EFI_P_PC_PRESENCE_DETECT),
        0,
        &gEfiCallerIdGuid,
        NULL,
        NULL,
        0
      );

      //
      // Discover device, now!
      //
      PERF_START (NULL, "DiscoverIdeDevice", "IDE", 0);
      Status = DiscoverIdeDevice (IdeBlkIoDevicePtr);
      PERF_END (NULL, "DiscoverIdeDevice", "IDE", 0);

      IdeBusDriverPrivateData->HaveScannedDevice[IdeChannel * 2 + IdeDevice]  = TRUE;
      IdeBusDriverPrivateData->DeviceProcessed[IdeChannel * 2 + IdeDevice]    = FALSE;

      if (!EFI_ERROR (Status)) {
        //
        // Set Device Path
        //
        ZeroMem (&NewNode, sizeof (NewNode));
        NewNode.DevPath.Type    = MESSAGING_DEVICE_PATH;
        NewNode.DevPath.SubType = MSG_ATAPI_DP;
        SetDevicePathNodeLength (&NewNode.DevPath, sizeof (ATAPI_DEVICE_PATH));

        NewNode.Atapi.PrimarySecondary  = (UINT8) IdeBlkIoDevicePtr->Channel;
        NewNode.Atapi.SlaveMaster       = (UINT8) IdeBlkIoDevicePtr->Device;
        NewNode.Atapi.Lun               = IdeBlkIoDevicePtr->Lun;
        IdeBlkIoDevicePtr->DevicePath = AppendDevicePathNode (
                                          ParentDevicePath,
                                          &NewNode.DevPath
                                          );
        if (IdeBlkIoDevicePtr->DevicePath == NULL) {
          ReleaseIdeResources (IdeBlkIoDevicePtr);
          continue;
        }

        //
        // Submit identify data to IDE controller init driver
        //
        CopyMem (&IdentifyData, IdeBlkIoDevicePtr->IdData, sizeof (IdentifyData));
        IdeBusDriverPrivateData->DeviceFound[IdeChannel * 2 + IdeDevice] = TRUE;
        IdeInit->SubmitData (IdeInit, IdeChannel, IdeDevice, &IdentifyData);
      } else {
        //
        // Device detection failed
        //
        IdeBusDriverPrivateData->DeviceFound[IdeChannel * 2 + IdeDevice] = FALSE;
        IdeInit->SubmitData (IdeInit, IdeChannel, IdeDevice, NULL);
        ReleaseIdeResources (IdeBlkIoDevicePtr);
        IdeBlkIoDevicePtr = NULL;
      }
      //
      // end of 1st inner loop ---
      //
    }
    //
    // end of 1st outer loop =========
    //
  }

  //
  // = 2nd outer loop == Primary/Secondary =================
  //
  for (IdeChannel = BeginningIdeChannel; IdeChannel <= EndIdeChannel; IdeChannel++) {

    //
    // -- 2nd inner loop --- Master/Slave --------
    //
    for (IdeDevice = BeginningIdeDevice; IdeDevice <= EndIdeDevice; IdeDevice++) {

      ASSERT (IdeChannel * 2 + IdeDevice < MAX_IDE_DEVICE);
      if (IdeBusDriverPrivateData->DeviceProcessed[IdeChannel * 2 + IdeDevice]) {
        continue;
      }

      if (!IdeBusDriverPrivateData->DeviceFound[IdeChannel * 2 + IdeDevice]) {
        continue;
      }

      Status = IdeInit->CalculateMode (
                          IdeInit,
                          IdeChannel,
                          IdeDevice,
                          &SupportedModes
                          );
      if (EFI_ERROR (Status)) {
        DEBUG ((EFI_D_ERROR, "[bStStp20S=%x]", Status));
        continue;
      }

      ASSERT (IdeChannel < IdeMaxChannel && IdeDevice < IdeMaxDevice);
      IdeBlkIoDevicePtr = IdeBlkIoDevice[IdeChannel][IdeDevice];

      //
      // Set best supported PIO mode on this IDE device
      //
      if (SupportedModes->PioMode.Mode <= AtaPioMode2) {
        TransferMode.ModeCategory = ATA_MODE_CATEGORY_DEFAULT_PIO;
      } else {
        TransferMode.ModeCategory = ATA_MODE_CATEGORY_FLOW_PIO;
      }

      TransferMode.ModeNumber = (UINT8) (SupportedModes->PioMode.Mode);

      if (SupportedModes->ExtModeCount == 0){
        Status                  = SetDeviceTransferMode (IdeBlkIoDevicePtr, &TransferMode);

        if (EFI_ERROR (Status)) {
          IdeBusDriverPrivateData->DeviceFound[IdeChannel * 2 + IdeDevice] = FALSE;
          ReleaseIdeResources (IdeBlkIoDevicePtr);
          IdeBlkIoDevicePtr = NULL;
          continue;
        }
      }

      //
      // Set supported DMA mode on this IDE device. Note that UDMA & MDMA cann't
      // be set together. Only one DMA mode can be set to a device. If setting
      // DMA mode operation fails, we can continue moving on because we only use
      // PIO mode at boot time. DMA modes are used by certain kind of OS booting
      //
      if (SupportedModes->UdmaMode.Valid) {

        TransferMode.ModeCategory = ATA_MODE_CATEGORY_UDMA;
        TransferMode.ModeNumber   = (UINT8) (SupportedModes->UdmaMode.Mode);
        Status                    = SetDeviceTransferMode (IdeBlkIoDevicePtr, &TransferMode);

        if (EFI_ERROR (Status)) {
          IdeBusDriverPrivateData->DeviceFound[IdeChannel * 2 + IdeDevice] = FALSE;
          ReleaseIdeResources (IdeBlkIoDevicePtr);
          IdeBlkIoDevicePtr = NULL;
          continue;
        }
        //
        // Record Udma Mode
        //
        IdeBlkIoDevicePtr->UdmaMode.Valid = TRUE;
        IdeBlkIoDevicePtr->UdmaMode.Mode  = SupportedModes->UdmaMode.Mode;
        EnableInterrupt (IdeBlkIoDevicePtr);
      } else if (SupportedModes->MultiWordDmaMode.Valid) {

        TransferMode.ModeCategory = ATA_MODE_CATEGORY_MDMA;
        TransferMode.ModeNumber   = (UINT8) SupportedModes->MultiWordDmaMode.Mode;
        Status                    = SetDeviceTransferMode (IdeBlkIoDevicePtr, &TransferMode);

        if (EFI_ERROR (Status)) {
          IdeBusDriverPrivateData->DeviceFound[IdeChannel * 2 + IdeDevice] = FALSE;
          ReleaseIdeResources (IdeBlkIoDevicePtr);
          IdeBlkIoDevicePtr = NULL;
          continue;
        }

        EnableInterrupt (IdeBlkIoDevicePtr);
      }
      //
      // Init driver parameters
      //
      DriveParameters.Sector          = (UINT8) ((ATA5_IDENTIFY_DATA *) IdeBlkIoDevicePtr->IdData)->sectors_per_track;
      DriveParameters.Heads           = (UINT8) (((ATA5_IDENTIFY_DATA *) IdeBlkIoDevicePtr->IdData)->heads - 1);
      DriveParameters.MultipleSector  = (UINT8) IdeBlkIoDevicePtr->IdData->AtaData.multi_sector_cmd_max_sct_cnt;
      //
      // Set Parameters for the device:
      // 1) Init
      // 2) Establish the block count for READ/WRITE MULTIPLE (EXT) command
      //
      if ((IdeBlkIoDevicePtr->Type == IdeHardDisk) || (IdeBlkIoDevicePtr->Type == Ide48bitAddressingHardDisk)) {
        Status = SetDriveParameters (IdeBlkIoDevicePtr, &DriveParameters);
      }

      //
      // Record PIO mode used in private data
      //
      IdeBlkIoDevicePtr->PioMode = (ATA_PIO_MODE) SupportedModes->PioMode.Mode;

      //
      // Set IDE controller Timing Blocks in the PCI Configuration Space
      //
      IdeInit->SetTiming (IdeInit, IdeChannel, IdeDevice, SupportedModes);

      //
      // Add Component Name for the IDE/ATAPI device that was discovered.
      //
      IdeBlkIoDevicePtr->ControllerNameTable = NULL;
      ADD_IDE_ATAPI_NAME (IdeBlkIoDevicePtr);

      Status = gBS->InstallMultipleProtocolInterfaces (
                      &IdeBlkIoDevicePtr->Handle,
                      &gEfiDevicePathProtocolGuid,
                      IdeBlkIoDevicePtr->DevicePath,
                      &gEfiBlockIoProtocolGuid,
                      &IdeBlkIoDevicePtr->BlkIo,
                      &gEfiDiskInfoProtocolGuid,
                      &IdeBlkIoDevicePtr->DiskInfo,
                      NULL
                      );

      if (EFI_ERROR (Status)) {
        ReleaseIdeResources (IdeBlkIoDevicePtr);
      }

      gBS->OpenProtocol (
            Controller,
            &gEfiPciIoProtocolGuid,
            (VOID **) &PciIo,
            This->DriverBindingHandle,
            IdeBlkIoDevicePtr->Handle,
            EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
            );

      IdeBusDriverPrivateData->DeviceProcessed[IdeChannel * 2 + IdeDevice] = TRUE;

      //
      // Report status code: device eanbled!
      //
      REPORT_STATUS_CODE_WITH_DEVICE_PATH (
        EFI_PROGRESS_CODE,
        (EFI_IO_BUS_ATA_ATAPI | EFI_P_PC_ENABLE),
        IdeBlkIoDevicePtr->DevicePath
        );

      //
      // Create event to clear pending IDE interrupt
      //
      Status = gBS->CreateEventEx (
                      EVT_NOTIFY_SIGNAL,
                      TPL_NOTIFY,
                      ClearInterrupt,
                      IdeBlkIoDevicePtr,
                      &gEfiEventExitBootServicesGuid,
                      &IdeBlkIoDevicePtr->ExitBootServiceEvent
                      );

      //
      // end of 2nd inner loop ----
      //
    }
    //
    // end of 2nd outer loop ==========
    //
  }

  //
  // All configurations done! Notify IdeController to do post initialization
  // work such as saving IDE controller PCI settings for S3 resume
  //
  IdeInit->NotifyPhase (IdeInit, EfiIdeBusPhaseMaximum, 0);

  if (SupportedModes != NULL) {
    FreePool (SupportedModes);
  }

  PERF_START (NULL, "Finish IDE detection", "IDE", 1);
  PERF_END (NULL, "Finish IDE detection", "IDE", 0);

  return EFI_SUCCESS;

ErrorExit:

  //
  // Report error code: controller error
  //
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_ERROR_CODE | EFI_ERROR_MINOR,
    (EFI_IO_BUS_ATA_ATAPI | EFI_IOB_EC_CONTROLLER_ERROR),
    ParentDevicePath
    );

  gBS->CloseProtocol (
        Controller,
        &gEfiIdeControllerInitProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  gBS->UninstallMultipleProtocolInterfaces (
        Controller,
        &gEfiCallerIdGuid,
        IdeBusDriverPrivateData,
        NULL
        );

  if (IdeBusDriverPrivateData != NULL) {
    gBS->FreePool (IdeBusDriverPrivateData);
  }

  if (SupportedModes != NULL) {
    gBS->FreePool (SupportedModes);
  }

  gBS->CloseProtocol (
        Controller,
        &gEfiPciIoProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  gBS->CloseProtocol (
        Controller,
        &gEfiDevicePathProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  return Status;

}
/**
  Stop function of Driver Binding Protocol which is to stop the driver on Controller Handle and all
  child handle attached to the controller handle if there are.

  @param  This Protocol instance pointer.
  @param  Controller Handle of device to stop driver on
  @param  NumberOfChildren Not used
  @param  ChildHandleBuffer Not used

  @retval  EFI_SUCCESS This driver is removed DeviceHandle
  @retval  other This driver was not removed from this device

**/
EFI_STATUS
EFIAPI
IDEBusDriverBindingStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL     *This,
  IN  EFI_HANDLE                      Controller,
  IN  UINTN                           NumberOfChildren,
  IN  EFI_HANDLE                      *ChildHandleBuffer
  )
{
  EFI_STATUS                  Status;
  EFI_PCI_IO_PROTOCOL         *PciIo;
  BOOLEAN                     AllChildrenStopped;
  UINTN                       Index;
  IDE_BUS_DRIVER_PRIVATE_DATA *IdeBusDriverPrivateData;
  UINT64                      Supports;

  IdeBusDriverPrivateData = NULL;

  if (NumberOfChildren == 0) {

    Status = gBS->OpenProtocol (
                    Controller,
                    &gEfiPciIoProtocolGuid,
                    (VOID **) &PciIo,
                    This->DriverBindingHandle,
                    Controller,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
    if (!EFI_ERROR (Status)) {
      Status = PciIo->Attributes (
                        PciIo,
                        EfiPciIoAttributeOperationSupported,
                        0,
                        &Supports
                        );
      if (!EFI_ERROR (Status)) {
        Supports &= (UINT64)(EFI_PCI_IO_ATTRIBUTE_IDE_PRIMARY_IO | EFI_PCI_IO_ATTRIBUTE_IDE_SECONDARY_IO | EFI_PCI_DEVICE_ENABLE);
        PciIo->Attributes (
                PciIo,
                EfiPciIoAttributeOperationDisable,
                Supports,
                NULL
                );
      }
    }

    gBS->OpenProtocol (
          Controller,
          &gEfiCallerIdGuid,
          (VOID **) &IdeBusDriverPrivateData,
          This->DriverBindingHandle,
          Controller,
          EFI_OPEN_PROTOCOL_GET_PROTOCOL
          );

    gBS->UninstallMultipleProtocolInterfaces (
          Controller,
          &gEfiCallerIdGuid,
          IdeBusDriverPrivateData,
          NULL
          );

    if (IdeBusDriverPrivateData != NULL) {
      gBS->FreePool (IdeBusDriverPrivateData);
    }
    //
    // Close the bus driver
    //
    gBS->CloseProtocol (
          Controller,
          &gEfiIdeControllerInitProtocolGuid,
          This->DriverBindingHandle,
          Controller
          );
    gBS->CloseProtocol (
          Controller,
          &gEfiPciIoProtocolGuid,
          This->DriverBindingHandle,
          Controller
          );
    gBS->CloseProtocol (
          Controller,
          &gEfiDevicePathProtocolGuid,
          This->DriverBindingHandle,
          Controller
          );

    return EFI_SUCCESS;
  }

  AllChildrenStopped = TRUE;

  for (Index = 0; Index < NumberOfChildren; Index++) {

    Status = DeRegisterIdeDevice (This, Controller, ChildHandleBuffer[Index]);

    if (EFI_ERROR (Status)) {
      AllChildrenStopped = FALSE;
    }
  }

  if (!AllChildrenStopped) {
    return EFI_DEVICE_ERROR;
  }

  return EFI_SUCCESS;
}

/**
  issue ATA or ATAPI command to reset a block IO device.
  @param  This                  Block IO protocol instance pointer.
  @param  ExtendedVerification  If FALSE,for ATAPI device, driver will only invoke ATAPI reset method
                                If TRUE, for ATAPI device, driver need invoke ATA reset method after
                                invoke ATAPI reset method

  @retval EFI_DEVICE_ERROR      When the device is neighther ATA device or ATAPI device.
  @retval EFI_SUCCESS           The device reset successfully

**/
EFI_STATUS
EFIAPI
IDEBlkIoReset (
  IN  EFI_BLOCK_IO_PROTOCOL   *This,
  IN  BOOLEAN                 ExtendedVerification
  )
{
  IDE_BLK_IO_DEV  *IdeBlkIoDevice;
  EFI_STATUS      Status;
  EFI_TPL         OldTpl;

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  IdeBlkIoDevice = IDE_BLOCK_IO_DEV_FROM_THIS (This);
  //
  // Requery IDE IO resources in case of the switch of native and legacy modes
  //
  ReassignIdeResources (IdeBlkIoDevice);

  //
  // for ATA device, using ATA reset method
  //
  if (IdeBlkIoDevice->Type == IdeHardDisk ||
      IdeBlkIoDevice->Type == Ide48bitAddressingHardDisk) {
    Status = AtaSoftReset (IdeBlkIoDevice);
    goto Done;
  }

  if (IdeBlkIoDevice->Type == IdeUnknown) {
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  //
  // for ATAPI device, using ATAPI reset method
  //
  Status = AtapiSoftReset (IdeBlkIoDevice);
  if (ExtendedVerification) {
    Status = AtaSoftReset (IdeBlkIoDevice);
  }

Done:
  gBS->RestoreTPL (OldTpl);
  return Status;
}

/**
  Read data from a block IO device

  @param  This       Block IO protocol instance pointer.
  @param  MediaId    The media ID of the device
  @param  Lba        Starting LBA address to read data
  @param  BufferSize The size of data to be read
  @param  Buffer     Caller supplied buffer to save data

  @retval EFI_DEVICE_ERROR  unknown device type
  @retval other             read data status.

**/
EFI_STATUS
EFIAPI
IDEBlkIoReadBlocks (
  IN  EFI_BLOCK_IO_PROTOCOL   *This,
  IN  UINT32                  MediaId,
  IN  EFI_LBA                 Lba,
  IN  UINTN                   BufferSize,
  OUT VOID                    *Buffer
  )
{
  IDE_BLK_IO_DEV  *IdeBlkIoDevice;
  EFI_STATUS      Status;
  EFI_TPL         OldTpl;

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  IdeBlkIoDevice = IDE_BLOCK_IO_DEV_FROM_THIS (This);

  //
  // Requery IDE IO resources in case of the switch of native and legacy modes
  //
  ReassignIdeResources (IdeBlkIoDevice);

  //
  // For ATA compatible device, use ATA read block's mechanism
  //
  if (IdeBlkIoDevice->Type == IdeHardDisk ||
      IdeBlkIoDevice->Type == Ide48bitAddressingHardDisk) {
    Status = AtaBlkIoReadBlocks (
            IdeBlkIoDevice,
            MediaId,
            Lba,
            BufferSize,
            Buffer
            );
    goto Done;
  }

  if (IdeBlkIoDevice->Type == IdeUnknown) {
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  //
  // for ATAPI device, using ATAPI read block's mechanism
  //
  Status = AtapiBlkIoReadBlocks (
          IdeBlkIoDevice,
          MediaId,
          Lba,
          BufferSize,
          Buffer
          );

Done:
  gBS->RestoreTPL (OldTpl);

  return Status;
}

/**
  Write data to block io device.

  @param  This       Protocol instance pointer.
  @param  MediaId    The media ID of the device
  @param  Lba        Starting LBA address to write data
  @param  BufferSize The size of data to be written
  @param  Buffer     Caller supplied buffer to save data

  @retval EFI_DEVICE_ERROR  unknown device type
  @retval other             write data status

**/
EFI_STATUS
EFIAPI
IDEBlkIoWriteBlocks (
  IN  EFI_BLOCK_IO_PROTOCOL   *This,
  IN  UINT32                  MediaId,
  IN  EFI_LBA                 Lba,
  IN  UINTN                   BufferSize,
  IN  VOID                    *Buffer
  )
{
  IDE_BLK_IO_DEV  *IdeBlkIoDevice;
  EFI_STATUS      Status;
  EFI_TPL         OldTpl;

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  IdeBlkIoDevice = IDE_BLOCK_IO_DEV_FROM_THIS (This);
  //
  // Requery IDE IO resources in case of the switch of native and legacy modes
  //
  ReassignIdeResources (IdeBlkIoDevice);

  //
  // for ATA device, using ATA write block's mechanism
  //
  if (IdeBlkIoDevice->Type == IdeHardDisk ||
      IdeBlkIoDevice->Type == Ide48bitAddressingHardDisk) {

    Status = AtaBlkIoWriteBlocks (
            IdeBlkIoDevice,
            MediaId,
            Lba,
            BufferSize,
            Buffer
            );
    goto Done;
  }

  if (IdeBlkIoDevice->Type == IdeUnknown) {
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  //
  // for ATAPI device, using ATAPI write block's mechanism
  //
  Status = AtapiBlkIoWriteBlocks (
          IdeBlkIoDevice,
          MediaId,
          Lba,
          BufferSize,
          Buffer
          );

Done:
  gBS->RestoreTPL (OldTpl);
  return Status;
}
/**
  Flushes all modified data to a physical block devices

  @param  This  Indicates a pointer to the calling context which to sepcify a
                sepcific block device

  @retval EFI_SUCCESS   Always return success.
**/
EFI_STATUS
EFIAPI
IDEBlkIoFlushBlocks (
  IN  EFI_BLOCK_IO_PROTOCOL   *This
  )
{
  //
  // return directly
  //
  return EFI_SUCCESS;
}

/**
  This function is used by the IDE bus driver to get inquiry data.
  Data format of Identify data is defined by the Interface GUID.

  @param  This                  Pointer to the EFI_DISK_INFO_PROTOCOL instance.
  @param  InquiryData           Pointer to a buffer for the inquiry data.
  @param  InquiryDataSize       Pointer to the value for the inquiry data size.

  @retval EFI_SUCCESS           The command was accepted without any errors.
  @retval EFI_NOT_FOUND         Device does not support this data class
  @retval EFI_DEVICE_ERROR      Error reading InquiryData from device
  @retval EFI_BUFFER_TOO_SMALL  IntquiryDataSize not big enough

**/
EFI_STATUS
EFIAPI
IDEDiskInfoInquiry (
  IN     EFI_DISK_INFO_PROTOCOL   *This,
  IN OUT VOID                     *InquiryData,
  IN OUT UINT32                   *InquiryDataSize
  )
{
  IDE_BLK_IO_DEV  *IdeBlkIoDevice;

  IdeBlkIoDevice = IDE_BLOCK_IO_DEV_FROM_DISK_INFO_THIS (This);

  if (*InquiryDataSize < sizeof (ATAPI_INQUIRY_DATA)) {
    *InquiryDataSize = sizeof (ATAPI_INQUIRY_DATA);
    return EFI_BUFFER_TOO_SMALL;
  }

  if (IdeBlkIoDevice->InquiryData == NULL) {
    return EFI_NOT_FOUND;
  }

  gBS->CopyMem (InquiryData, IdeBlkIoDevice->InquiryData, sizeof (ATAPI_INQUIRY_DATA));
  *InquiryDataSize = sizeof (ATAPI_INQUIRY_DATA);

  return EFI_SUCCESS;
}

/**
  This function is used by the IDE bus driver to get identify data.
  Data format of Identify data is defined by the Interface GUID.

  @param  This                  Pointer to the EFI_DISK_INFO_PROTOCOL instance.
  @param  IdentifyData          Pointer to a buffer for the identify data.
  @param  IdentifyDataSize      Pointer to the value for the identify data size.

  @retval EFI_SUCCESS           The command was accepted without any errors.
  @retval EFI_NOT_FOUND         Device does not support this data class
  @retval EFI_DEVICE_ERROR      Error reading IdentifyData from device
  @retval EFI_BUFFER_TOO_SMALL  IdentifyDataSize not big enough

**/
EFI_STATUS
EFIAPI
IDEDiskInfoIdentify (
  IN     EFI_DISK_INFO_PROTOCOL   *This,
  IN OUT VOID                     *IdentifyData,
  IN OUT UINT32                   *IdentifyDataSize
  )
{
  IDE_BLK_IO_DEV  *IdeBlkIoDevice;

  IdeBlkIoDevice = IDE_BLOCK_IO_DEV_FROM_DISK_INFO_THIS (This);

  if (*IdentifyDataSize < sizeof (EFI_IDENTIFY_DATA)) {
    *IdentifyDataSize = sizeof (EFI_IDENTIFY_DATA);
    return EFI_BUFFER_TOO_SMALL;
  }

  if (IdeBlkIoDevice->IdData == NULL) {
    return EFI_NOT_FOUND;
  }

  gBS->CopyMem (IdentifyData, IdeBlkIoDevice->IdData, sizeof (EFI_IDENTIFY_DATA));
  *IdentifyDataSize = sizeof (EFI_IDENTIFY_DATA);

  return EFI_SUCCESS;
}

/**
  This function is used by the IDE bus driver to get sense data.
  Data format of Sense data is defined by the Interface GUID.

  @param  This                  Pointer to the EFI_DISK_INFO_PROTOCOL instance.
  @param  SenseData             Pointer to the SenseData.
  @param  SenseDataSize         Size of SenseData in bytes.
  @param  SenseDataNumber       Pointer to the value for the identify data size.

  @retval EFI_SUCCESS           The command was accepted without any errors.
  @retval EFI_NOT_FOUND         Device does not support this data class
  @retval EFI_DEVICE_ERROR      Error reading InquiryData from device
  @retval EFI_BUFFER_TOO_SMALL  SenseDataSize not big enough

**/
EFI_STATUS
EFIAPI
IDEDiskInfoSenseData (
  IN     EFI_DISK_INFO_PROTOCOL   *This,
  IN OUT VOID                     *SenseData,
  IN OUT UINT32                   *SenseDataSize,
  OUT    UINT8                    *SenseDataNumber
  )
{
  return EFI_NOT_FOUND;
}

/**
  This function is used by the IDE bus driver to get controller information.

  @param  This                  Pointer to the EFI_DISK_INFO_PROTOCOL instance.
  @param  IdeChannel            Pointer to the Ide Channel number. Primary or secondary.
  @param  IdeDevice             Pointer to the Ide Device number. Master or slave.

  @retval EFI_SUCCESS           IdeChannel and IdeDevice are valid
  @retval EFI_UNSUPPORTED       This is not an IDE device

**/
EFI_STATUS
EFIAPI
IDEDiskInfoWhichIde (
  IN  EFI_DISK_INFO_PROTOCOL   *This,
  OUT UINT32                   *IdeChannel,
  OUT UINT32                   *IdeDevice
  )
{
  IDE_BLK_IO_DEV  *IdeBlkIoDevice;

  IdeBlkIoDevice  = IDE_BLOCK_IO_DEV_FROM_DISK_INFO_THIS (This);
  *IdeChannel     = IdeBlkIoDevice->Channel;
  *IdeDevice      = IdeBlkIoDevice->Device;

  return EFI_SUCCESS;
}

/**
  The is an event(generally the event is exitBootService event) call back function.
  Clear pending IDE interrupt before OS loader/kernel take control of the IDE device.

  @param  Event   Pointer to this event
  @param  Context Event handler private data

**/
VOID
EFIAPI
ClearInterrupt (
  IN EFI_EVENT  Event,
  IN VOID       *Context
  )
{
  EFI_STATUS      Status;
  UINT64          IoPortForBmis;
  UINT8           RegisterValue;
  IDE_BLK_IO_DEV  *IdeDev;

  //
  // Get our context
  //
  IdeDev = (IDE_BLK_IO_DEV *) Context;

  //
  // Obtain IDE IO port registers' base addresses
  //
  Status = ReassignIdeResources (IdeDev);
  if (EFI_ERROR (Status)) {
    return;
  }

  //
  // Check whether interrupt is pending
  //

  //
  // Reset IDE device to force it de-assert interrupt pin
  // Note: this will reset all devices on this IDE channel
  //
  Status = AtaSoftReset (IdeDev);
  if (EFI_ERROR (Status)) {
    return;
  }

  //
  // Get base address of IDE Bus Master Status Regsiter
  //
  if (IdePrimary == IdeDev->Channel) {
    IoPortForBmis = IdeDev->IoPort->BusMasterBaseAddr + BMISP_OFFSET;
  } else {
    if (IdeSecondary == IdeDev->Channel) {
      IoPortForBmis = IdeDev->IoPort->BusMasterBaseAddr + BMISS_OFFSET;
    } else {
      return;
    }
  }
  //
  // Read BMIS register and clear ERROR and INTR bit
  //
  IdeDev->PciIo->Io.Read (
                      IdeDev->PciIo,
                      EfiPciIoWidthUint8,
                      EFI_PCI_IO_PASS_THROUGH_BAR,
                      IoPortForBmis,
                      1,
                      &RegisterValue
                      );

  RegisterValue |= (BMIS_INTERRUPT | BMIS_ERROR);

  IdeDev->PciIo->Io.Write (
                      IdeDev->PciIo,
                      EfiPciIoWidthUint8,
                      EFI_PCI_IO_PASS_THROUGH_BAR,
                      IoPortForBmis,
                      1,
                      &RegisterValue
                      );

  //
  // Select the other device on this channel to ensure this device to release the interrupt pin
  //
  if (IdeDev->Device == 0) {
    RegisterValue = (1 << 4) | 0xe0;
  } else {
    RegisterValue = (0 << 4) | 0xe0;
  }
  IDEWritePortB (
    IdeDev->PciIo,
    IdeDev->IoPort->Head,
    RegisterValue
    );

}

/**
  The user Entry Point for module IdeBus. The user code starts with this function.

  @param[in] ImageHandle    The firmware allocated handle for the EFI image.
  @param[in] SystemTable    A pointer to the EFI System Table.

  @retval EFI_SUCCESS       The entry point is executed successfully.
  @retval other             Some error occurs when executing this entry point.

**/
EFI_STATUS
EFIAPI
InitializeIdeBus(
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
{
  EFI_STATUS              Status;

  //
  // Install driver model protocol(s).
  //
  Status = EfiLibInstallAllDriverProtocols2 (
             ImageHandle,
             SystemTable,
             &gIDEBusDriverBinding,
             ImageHandle,
             &gIDEBusComponentName,
             &gIDEBusComponentName2,
             NULL,
             NULL,
             &gIDEBusDriverDiagnostics,
             &gIDEBusDriverDiagnostics2
             );
  ASSERT_EFI_ERROR (Status);

  return Status;
}