/** @file
  Serial I/O Port library functions with no library constructor/destructor

  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
  Copyright (c) 2012, ARM Ltd. All rights reserved.
  
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which 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.

**/

#include <Base.h>


#include <Library/SerialPortLib.h>
#include <Library/SerialPortExtLib.h>

/**

  Programmed hardware of Serial port.

  @return    Always return EFI_UNSUPPORTED.

**/
RETURN_STATUS
EFIAPI
SerialPortInitialize (
  VOID
  )
{
  return RETURN_UNSUPPORTED;
}

/**
  Set the serial device control bits.

  @return    Always return EFI_UNSUPPORTED.

**/
RETURN_STATUS
EFIAPI
SerialPortSetControl (
    IN UINT32                   Control
  )
{
  return RETURN_UNSUPPORTED;
}

/**
  Get the serial device control bits.

  @param  Control                 Control signals read from the serial device.

  @retval EFI_SUCCESS             The control bits were read from the serial device.
  @retval EFI_DEVICE_ERROR        The serial device is not functioning correctly.

**/
RETURN_STATUS
EFIAPI
SerialPortGetControl (
  OUT UINT32                  *Control
  )
{
  if (SerialPortPoll ()) {
    // If a character is pending don't set EFI_SERIAL_INPUT_BUFFER_EMPTY
    *Control = EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
  } else {
    *Control = EFI_SERIAL_INPUT_BUFFER_EMPTY | EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
  }
  return EFI_SUCCESS;
}

/**
  Set the serial device attributes.

  @return    Always return EFI_UNSUPPORTED.

**/
RETURN_STATUS
EFIAPI
SerialPortSetAttributes (
  IN OUT  UINT64              *BaudRate,
  IN OUT  UINT32              *ReceiveFifoDepth,
  IN OUT  UINT32              *Timeout,
  IN OUT  EFI_PARITY_TYPE     *Parity,
  IN OUT  UINT8               *DataBits,
  IN OUT  EFI_STOP_BITS_TYPE  *StopBits
  )
{
  return RETURN_UNSUPPORTED;
}

/**
  Write data to serial device.

  @param  Buffer           Point of data buffer which need to be written.
  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.

  @retval 0                Write data failed.
  @retval !0               Actual number of bytes written to serial device.

**/
UINTN
EFIAPI
SerialPortWrite (
  IN UINT8     *Buffer,
  IN UINTN     NumberOfBytes
  )
{
  return 0;
}


/**
  Read data from serial device and save the data in buffer.

  @param  Buffer           Point of data buffer which need to be written.
  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.

  @retval 0                Read data failed.
  @retval !0               Actual number of bytes read from serial device.

**/
UINTN
EFIAPI
SerialPortRead (
  OUT UINT8     *Buffer,
  IN  UINTN     NumberOfBytes
  )
{
  return 0;
}



/**
  Poll the serial device to see if there is any data waiting.

  If there is data waiting to be read from the serial port, then return
  TRUE.  If there is no data waiting to be read from the serial port, then 
  return FALSE.

  @retval TRUE             Data is waiting to be read.
  @retval FALSE            There is no data waiting to be read.

**/
BOOLEAN
EFIAPI
SerialPortPoll (
  VOID
  )
{
  return 0;
}