atapipassthru.c

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  Lun:      The LUN of the ATAPI device to send the SCSI Request
            Packet. To the ATAPI device, Lun is always 0.
  Packet:   The SCSI Request Packet to send to the ATAPI device 
            specified by Target and Lun.
  Event:    If non-blocking I/O is not supported then Event is ignored, 
            and blocking I/O is performed.
            If Event is NULL, then blocking I/O is performed.
            If Event is not NULL and non blocking I/O is supported, 
            then non-blocking I/O is performed, and Event will be signaled 
            when the SCSI Request Packet completes.      

Returns:  

   EFI_STATUS
   
--*/
{
  ATAPI_SCSI_PASS_THRU_DEV               *AtapiScsiPrivate;
  EFI_STATUS                             Status;

#if (EFI_SPECIFICATION_VERSION >= 0x00020000)
  EFI_SCSI_PASS_THRU_SCSI_REQUEST_PACKET CommandPacket;
  EFI_SCSI_IO_SCSI_REQUEST_PACKET        *RequestPacket;

  //
  //Transfer EFI_SCSI_IO_SCSI_REQUEST_PACKET packet to EFI_SCSI_PASS_THRU_SCSI_REQUEST_PACKET packet
  //
  RequestPacket = (EFI_SCSI_IO_SCSI_REQUEST_PACKET*)Packet;
  Status = PacketSwitch (RequestPacket, &CommandPacket);
  if (EFI_ERROR (Status)) {
    return Status;
  }
#endif

  AtapiScsiPrivate = ATAPI_SCSI_PASS_THRU_DEV_FROM_THIS (This);

  //
  // Target is not allowed beyond MAX_TARGET_ID
  //
  if (Target > MAX_TARGET_ID) {
    return EFI_INVALID_PARAMETER;
  }
  
  //
  // check the data fields in Packet parameter.
  //
#if (EFI_SPECIFICATION_VERSION >= 0x00020000)
  Status = CheckSCSIRequestPacket (&CommandPacket);
#else 
  Status = CheckSCSIRequestPacket (Packet);
#endif
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // If Request Packet targets at the IDE channel itself,
  // do nothing.
  //
  if (Target == This->Mode->AdapterId) {
  #if (EFI_SPECIFICATION_VERSION >= 0x00020000)
    CommandPacket.TransferLength = 0;
  #else
    Packet->TransferLength = 0;
  #endif
    return EFI_SUCCESS;
  }
  
  //
  // According to Target ID, reset the Atapi I/O Register mapping
  // (Target Id in [0,1] area, using AtapiIoPortRegisters[0],
  //  Target Id in [2,3] area, using AtapiIoPortRegisters[1]
  //
  if ((Target / 2) == 0) {
    AtapiScsiPrivate->IoPort = &AtapiIoPortRegisters[0];
  } else {
    AtapiScsiPrivate->IoPort = &AtapiIoPortRegisters[1];
  }
  
  //
  // the ATAPI SCSI interface does not support non-blocking I/O
  // ignore the Event parameter
  //
  // Performs blocking I/O.
  //
#if (EFI_SPECIFICATION_VERSION >= 0x00020000)
  Status = SubmitBlockingIoCommand (AtapiScsiPrivate, Target, &CommandPacket);
#else
  Status = SubmitBlockingIoCommand (AtapiScsiPrivate, Target, Packet);
#endif
  return Status;
}

EFI_STATUS
EFIAPI
AtapiScsiPassThruGetNextDevice (
  IN  EFI_SCSI_PASS_THRU_PROTOCOL    *This,
  IN OUT UINT32                      *Target,
  IN OUT UINT64                      *Lun
  )
/*++

Routine Description:

  Used to retrieve the list of legal Target IDs for SCSI devices 
  on a SCSI channel.

Arguments:

  This                  - Protocol instance pointer.
  Target                - On input, a pointer to the Target ID of a SCSI 
                          device present on the SCSI channel.  On output, 
                          a pointer to the Target ID of the next SCSI device
                          present on a SCSI channel.  An input value of 
                          0xFFFFFFFF retrieves the Target ID of the first 
                          SCSI device present on a SCSI channel.
  Lun                   - On input, a pointer to the LUN of a SCSI device
                          present on the SCSI channel. On output, a pointer
                          to the LUN of the next SCSI device present on 
                          a SCSI channel.
Returns:

  EFI_SUCCESS           - The Target ID and Lun of the next SCSI device 
                          on the SCSI channel was returned in Target and Lun.
  EFI_NOT_FOUND         - There are no more SCSI devices on this SCSI channel.
  EFI_INVALID_PARAMETER - Target is not 0xFFFFFFFF,and Target and Lun were not
                           returned on a previous call to GetNextDevice().
--*/
{
  ATAPI_SCSI_PASS_THRU_DEV  *AtapiScsiPrivate;

  //
  // Retrieve Device Private Data Structure.
  //
  AtapiScsiPrivate = ATAPI_SCSI_PASS_THRU_DEV_FROM_THIS (This);

  //
  // Check whether Target is valid.
  //
  if (Target == NULL || Lun == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  if ((*Target != 0xFFFFFFFF) &&
      ((*Target != AtapiScsiPrivate->LatestTargetId) ||
      (*Lun != AtapiScsiPrivate->LatestLun))) {
    return EFI_INVALID_PARAMETER;
  }

  if (*Target == MAX_TARGET_ID) {
    return EFI_NOT_FOUND;
  }

  if (*Target == 0xFFFFFFFF) {
    *Target = 0;
  } else {
    *Target = AtapiScsiPrivate->LatestTargetId + 1;
  }

  *Lun = 0;

  //
  // Update the LatestTargetId.
  //
  AtapiScsiPrivate->LatestTargetId  = *Target;
  AtapiScsiPrivate->LatestLun       = *Lun;

  return EFI_SUCCESS;

}

EFI_STATUS
EFIAPI
AtapiScsiPassThruBuildDevicePath (
  IN     EFI_SCSI_PASS_THRU_PROTOCOL    *This,
  IN     UINT32                         Target,
  IN     UINT64                         Lun,
  IN OUT EFI_DEVICE_PATH_PROTOCOL       **DevicePath
  )
/*++

Routine Description:

  Used to allocate and build a device path node for a SCSI device 
  on a SCSI channel. Would not build device path for a SCSI Host Controller.

Arguments:

  This                  - Protocol instance pointer.
  Target                - The Target ID of the SCSI device for which
                          a device path node is to be allocated and built.
  Lun                   - The LUN of the SCSI device for which a device 
                          path node is to be allocated and built.
  DevicePath            - A pointer to a single device path node that 
                          describes the SCSI device specified by 
                          Target and Lun. This function is responsible 
                          for allocating the buffer DevicePath with the boot
                          service AllocatePool().  It is the caller's 
                          responsibility to free DevicePath when the caller
                          is finished with DevicePath.    
  Returns:
  EFI_SUCCESS           - The device path node that describes the SCSI device
                          specified by Target and Lun was allocated and 
                          returned in DevicePath.
  EFI_NOT_FOUND         - The SCSI devices specified by Target and Lun does
                          not exist on the SCSI channel.
  EFI_INVALID_PARAMETER - DevicePath is NULL.
  EFI_OUT_OF_RESOURCES  - There are not enough resources to allocate 
                          DevicePath.
--*/
{
  ATAPI_SCSI_PASS_THRU_DEV  *AtapiScsiPrivate;
  EFI_DEV_PATH              *Node;

  //
  // Retrieve Device Private Data Structure.
  //
  AtapiScsiPrivate = ATAPI_SCSI_PASS_THRU_DEV_FROM_THIS (This);

  //
  // Validate parameters passed in.
  //
  
  if (DevicePath == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  
  //
  // can not build device path for the SCSI Host Controller.
  //
  if ((Target > (MAX_TARGET_ID - 1)) || (Lun != 0)) {
    return EFI_NOT_FOUND;
  }

  Node = EfiLibAllocateZeroPool (sizeof (EFI_DEV_PATH));
  if (Node == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Node->DevPath.Type    = MESSAGING_DEVICE_PATH;
  Node->DevPath.SubType = MSG_ATAPI_DP;
  SetDevicePathNodeLength (&Node->DevPath, sizeof (ATAPI_DEVICE_PATH));

  Node->Atapi.PrimarySecondary  = (UINT8) (Target / 2);
  Node->Atapi.SlaveMaster       = (UINT8) (Target % 2);
  Node->Atapi.Lun               = (UINT16) Lun;

  *DevicePath                   = (EFI_DEVICE_PATH_PROTOCOL *) Node;

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
AtapiScsiPassThruGetTargetLun (
  IN  EFI_SCSI_PASS_THRU_PROTOCOL    *This,
  IN  EFI_DEVICE_PATH_PROTOCOL       *DevicePath,
  OUT UINT32                         *Target,
  OUT UINT64                         *Lun
  )
/*++

Routine Description:

  Used to translate a device path node to a Target ID and LUN.

Arguments:

  This                  - Protocol instance pointer.
  DevicePath            - A pointer to the device path node that 
                          describes a SCSI device on the SCSI channel.
  Target                - A pointer to the Target ID of a SCSI device 
                          on the SCSI channel. 
  Lun                   - A pointer to the LUN of a SCSI device on 
                          the SCSI channel.    
Returns:

  EFI_SUCCESS           - DevicePath was successfully translated to a 
                          Target ID and LUN, and they were returned 
                          in Target and Lun.
  EFI_INVALID_PARAMETER - DevicePath/Target/Lun is NULL.
  EFI_UNSUPPORTED       - This driver does not support the device path 
                          node type in DevicePath.
  EFI_NOT_FOUND         - A valid translation from DevicePath to a 
                          Target ID and LUN does not exist.
--*/
{
  EFI_DEV_PATH  *Node;

  //
  // Validate parameters passed in.
  //
  if (DevicePath == NULL || Target == NULL || Lun == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  
  //
  // Check whether the DevicePath belongs to SCSI_DEVICE_PATH
  //
  if ((DevicePath->Type != MESSAGING_DEVICE_PATH) ||
      (DevicePath->SubType != MSG_ATAPI_DP) ||
      (DevicePathNodeLength(DevicePath) != sizeof(ATAPI_DEVICE_PATH))) {
    return EFI_UNSUPPORTED;
  }

  Node    = (EFI_DEV_PATH *) DevicePath;

  *Target = Node->Atapi.PrimarySecondary * 2 + Node->Atapi.SlaveMaster;
  *Lun    = Node->Atapi.Lun;

  if (*Target > (MAX_TARGET_ID - 1) || *Lun != 0) {
    return EFI_NOT_FOUND;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
AtapiScsiPassThruResetChannel (
  IN  EFI_SCSI_PASS_THRU_PROTOCOL   *This
  )
/*++

Routine Description:

  Resets a SCSI channel.This operation resets all the 
  SCSI devices connected to the SCSI channel.

Arguments:

  This                  - Protocol instance pointer.

Returns:

  EFI_SUCCESS           - The SCSI channel was reset.
  EFI_UNSUPPORTED       - The SCSI channel does not support 
                          a channel reset operation.
  EFI_DEVICE_ERROR      - A device error occurred while 
                          attempting to reset the SCSI channel.
  EFI_TIMEOUT           - A timeout occurred while attempting 
                          to reset the SCSI channel.
--*/
{
  UINT8                     DeviceControlValue;
  ATAPI_SCSI_PASS_THRU_DEV  *AtapiScsiPrivate;
  UINT8                     Index;

  AtapiScsiPrivate = ATAPI_SCSI_PASS_THRU_DEV_FROM_THIS (This);

  //
  // Reset both Primary channel and Secondary channel.
  // so, the IoPort pointer must point to the right I/O Register group
  //
  for (Index = 0; Index < 2; Index++) {
    //
    // Reset
    //
    AtapiScsiPrivate->IoPort  = &AtapiIoPortRegisters[Index];

    DeviceControlValue        = 0;
    //
    // set SRST bit to initiate soft reset
    //
    DeviceControlValue |= SRST;
    //
    // disable Interrupt
    //
    DeviceControlValue |= bit (1);
    WritePortB (
      AtapiScsiPrivate->PciIo,
      AtapiScsiPrivate->IoPort->Alt.DeviceControl,
      DeviceControlValue
      );

    //
    // Wait 10us
    //
    gBS->Stall (10);

    //
    // Clear SRST bit
    // 0xfb:1111,1011
    //
    DeviceControlValue &= 0xfb;
    
    WritePortB (AtapiScsiPrivate->PciIo, AtapiScsiPrivate->IoPort->Alt.DeviceControl, DeviceControlValue);

    //
    // slave device needs at most 31s to clear BSY
    //
    if (StatusWaitForBSYClear (AtapiScsiPrivate, 31000) == EFI_TIMEOUT) {
      return EFI_DEVICE_ERROR;
    }
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
AtapiScsiPassThruResetTarget (
  IN EFI_SCSI_PASS_THRU_PROTOCOL    *This,
  IN UINT32                         Target,
  IN UINT64                         Lun
  )
/*++

Routine Description:

  Resets a SCSI device that is connected to a SCSI channel.

Arguments:

  This                  - Protocol instance pointer.
  Target                - The Target ID of the SCSI device to reset. 
  Lun                   - The LUN of the SCSI device to reset.
    
Returns:

  EFI_SUCCESS           - The SCSI device specified by Target and 
                          Lun was reset.
  EFI_UNSUPPORTED       - The SCSI channel does not support a target
                          reset operation.
  EFI_INVALID_PARAMETER - Target or Lun are invalid.
  EFI_DEVICE_ERROR      - A device error occurred while attempting 
                          to reset the SCSI device specified by Target 
                          and Lun.
  EFI_TIMEOUT           - A timeout occurred while attempting to reset 
                          the SCSI device specified by Target and Lun.
--*/
{
  ATAPI_SCSI_PASS_THRU_DEV  *AtapiScsiPrivate;
  UINT8                     Command;
  UINT8                     DeviceSelect;

  AtapiScsiPrivate = ATAPI_SCSI_PASS_THRU_DEV_FROM_THIS (This);

  if (Target > MAX_TARGET_ID) {
    return EFI_INVALID_PARAMETER;
  }
  //
  // Directly return EFI_SUCCESS if want to reset the host controller
  //
  if (Target == This->Mode->AdapterId) {
    return EFI_SUCCESS;
  }
  
  //
  // According to Target ID, reset the Atapi I/O Register mapping
  // (Target Id in [0,1] area, using AtapiIoPortRegisters[0],
  //  Target Id in [2,3] area, using AtapiIoPortRegisters[1]
  //
  if ((Target / 2) == 0) {
    AtapiScsiPrivate->IoPort = &AtapiIoPortRegisters[0];
  } else {
    AtapiScsiPrivate->IoPort = &AtapiIoPortRegisters[1];
  }
  
  //
  // for ATAPI device, no need to wait DRDY ready after device selecting.
  //
  // bit7 and bit5 are both set to 1 for backward compatibility
  //
  DeviceSelect = (UINT8) (((bit (7) | bit (5)) | (Target << 4)));
  WritePortB (AtapiScsiPrivate->PciIo, AtapiScsiPrivate->IoPort->Head, DeviceSelect);

  Command = ATAPI_SOFT_RESET_CMD;
  WritePortB (AtapiScsiPrivate->PciIo, AtapiScsiPrivate->IoPort->Reg.Command, Command);

  //
  // BSY clear is the only status return to the host by the device
  // when reset is complete.
  // slave device needs at most 31s to clear BSY
  //
  if (EFI_ERROR (StatusWaitForBSYClear (AtapiScsiPrivate, 31000))) {
    return EFI_DEVICE_ERROR;
  }
  
  //
  // stall 5 seconds to make the device status stable
  //
  gBS->Stall (5000000);

  return EFI_SUCCESS;
}

    
EFI_STATUS