audk/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.c

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

  Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
  Copyright (c) 2012, ARM Ltd. All rights reserved.<BR>
  
  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/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/SerialPortLib.h>
#include <Library/SerialPortExtLib.h>

#include <Drivers/PL011Uart.h>


/**

  Programmed hardware of Serial port.

  @return    Always return RETURN_UNSUPPORTED.

**/
RETURN_STATUS
EFIAPI
SerialPortInitialize (
  VOID
  )
{
  return PL011UartInitializePort (
      (UINTN)PcdGet64 (PcdSerialRegisterBase),
      (UINTN)PcdGet64 (PcdUartDefaultBaudRate),
      0, // Use the default value for Fifo depth
      (EFI_PARITY_TYPE)PcdGet8 (PcdUartDefaultParity),
      PcdGet8 (PcdUartDefaultDataBits),
      (EFI_STOP_BITS_TYPE) PcdGet8 (PcdUartDefaultStopBits));
}

/**
  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 PL011UartWrite ((UINTN)PcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
}

/**
  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 PL011UartRead ((UINTN)PcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
}

/**
  Check to see if any data is available to be read from the debug device.

  @retval EFI_SUCCESS       At least one byte of data is available to be read
  @retval EFI_NOT_READY     No data is available to be read
  @retval EFI_DEVICE_ERROR  The serial device is not functioning properly

**/
BOOLEAN
EFIAPI
SerialPortPoll (
  VOID
  )
{
  return PL011UartPoll ((UINTN)PcdGet64 (PcdSerialRegisterBase));
}

/**
  Set new attributes to PL011.

  @param  BaudRate                The baud rate of the serial device. If the baud rate is not supported,
                                  the speed will be reduced down to the nearest supported one and the
                                  variable's value will be updated accordingly.
  @param  ReceiveFifoDepth        The number of characters the device will buffer on input. If the specified
                                  value is not supported, the variable's value will be reduced down to the
                                  nearest supported one.
  @param  Timeout                 If applicable, the number of microseconds the device will wait
                                  before timing out a Read or a Write operation.
  @param  Parity                  If applicable, this is the EFI_PARITY_TYPE that is computer or checked
                                  as each character is transmitted or received. If the device does not
                                  support parity, the value is the default parity value.
  @param  DataBits                The number of data bits in each character
  @param  StopBits                If applicable, the EFI_STOP_BITS_TYPE number of stop bits per character.
                                  If the device does not support stop bits, the value is the default stop
                                  bit value.

  @retval EFI_SUCCESS             All attributes were set correctly on the serial device.
  @retval EFI_INVALID_PARAMETERS  One or more of the attributes has an unsupported value.

**/
RETURN_STATUS
EFIAPI
SerialPortSetAttributes (
  IN UINT64              BaudRate,
  IN UINT32              ReceiveFifoDepth,
  IN UINT32              Timeout,
  IN EFI_PARITY_TYPE     Parity,
  IN UINT8               DataBits,
  IN EFI_STOP_BITS_TYPE  StopBits
  )
{
  return PL011UartInitializePort (
        (UINTN)PcdGet64 (PcdSerialRegisterBase),
        BaudRate,
        ReceiveFifoDepth,
        Parity,
        DataBits,
        StopBits);
}

/**
  Set the serial device control bits.

  @param  Control                 Control bits which are to be set on the serial device.

  @retval EFI_SUCCESS             The new control bits were set on the serial device.
  @retval EFI_UNSUPPORTED         The serial device does not support this operation.
  @retval EFI_DEVICE_ERROR        The serial device is not functioning correctly.

**/
RETURN_STATUS
EFIAPI
SerialPortSetControl (
  IN UINT32                  Control
  )
{
  return PL011UartSetControl((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
}

/**
  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
  )
{
  return PL011UartGetControl((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
}