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/** @file
*
* Copyright (c) 2011-2016, ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#ifndef __PL011_UART_LIB_H__
#define __PL011_UART_LIB_H__
#include <Uefi/UefiBaseType.h>
#include <Protocol/SerialIo.h>
/**
Initialise the serial port to the specified settings.
All unspecified settings will be set to the default values.
@param[in] UartBase The base address of the serial device.
@param[in] UartClkInHz The clock in Hz for the serial device.
Ignored if the PCD PL011UartInteger is not 0
@param[in out] BaudRate The baud rate of the serial device. If the
baud rate is not supported, the speed will be
reduced to the nearest supported one and the
variable's value will be updated accordingly.
@param[in out] ReceiveFifoDepth The number of characters the device will
buffer on input. Value of 0 will use the
device's default FIFO depth.
@param[in out] Parity If applicable, this is the EFI_PARITY_TYPE
that is computed or checked as each character
is transmitted or received. If the device
does not support parity, the value is the
default parity value.
@param[in out] DataBits The number of data bits in each character.
@param[in out] 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 RETURN_SUCCESS All attributes were set correctly on the
serial device.
@retval RETURN_INVALID_PARAMETER One or more of the attributes has an
unsupported value.
**/
RETURN_STATUS
EFIAPI
PL011UartInitializePort (
IN UINTN UartBase,
IN UINT32 UartClkInHz,
IN OUT UINT64 *BaudRate,
IN OUT UINT32 *ReceiveFifoDepth,
IN OUT EFI_PARITY_TYPE *Parity,
IN OUT UINT8 *DataBits,
IN OUT EFI_STOP_BITS_TYPE *StopBits
);
/**
Assert or deassert the control signals on a serial port.
The following control signals are set according their bit settings :
. Request to Send
. Data Terminal Ready
@param[in] UartBase UART registers base address
@param[in] Control The following bits are taken into account :
. EFI_SERIAL_REQUEST_TO_SEND : assert/deassert the
"Request To Send" control signal if this bit is
equal to one/zero.
. EFI_SERIAL_DATA_TERMINAL_READY : assert/deassert
the "Data Terminal Ready" control signal if this
bit is equal to one/zero.
. EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE : enable/disable
the hardware loopback if this bit is equal to
one/zero.
. EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE : not supported.
. EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE : enable/
disable the hardware flow control based on CTS (Clear
To Send) and RTS (Ready To Send) control signals.
@retval RETURN_SUCCESS The new control bits were set on the device.
@retval RETURN_UNSUPPORTED The device does not support this operation.
**/
RETURN_STATUS
EFIAPI
PL011UartSetControl (
IN UINTN UartBase,
IN UINT32 Control
);
/**
Retrieve the status of the control bits on a serial device.
@param[in] UartBase UART registers base address
@param[out] Control Status of the control bits on a serial device :
. EFI_SERIAL_DATA_CLEAR_TO_SEND,
EFI_SERIAL_DATA_SET_READY,
EFI_SERIAL_RING_INDICATE,
EFI_SERIAL_CARRIER_DETECT,
EFI_SERIAL_REQUEST_TO_SEND,
EFI_SERIAL_DATA_TERMINAL_READY
are all related to the DTE (Data Terminal Equipment)
and DCE (Data Communication Equipment) modes of
operation of the serial device.
. EFI_SERIAL_INPUT_BUFFER_EMPTY : equal to one if the
receive buffer is empty, 0 otherwise.
. EFI_SERIAL_OUTPUT_BUFFER_EMPTY : equal to one if the
transmit buffer is empty, 0 otherwise.
. EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE : equal to one if
the hardware loopback is enabled (the output feeds the
receive buffer), 0 otherwise.
. EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE : equal to one if
a loopback is accomplished by software, 0 otherwise.
. EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE : equal to
one if the hardware flow control based on CTS (Clear
To Send) and RTS (Ready To Send) control signals is
enabled, 0 otherwise.
@retval RETURN_SUCCESS The control bits were read from the serial device.
**/
RETURN_STATUS
EFIAPI
PL011UartGetControl (
IN UINTN UartBase,
OUT UINT32 *Control
);
/**
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
PL011UartWrite (
IN UINTN UartBase,
IN UINT8 *Buffer,
IN UINTN 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
PL011UartRead (
IN UINTN UartBase,
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
);
/**
Check to see if any data is available to be read from the debug device.
@retval TRUE At least one byte of data is available to be read
@retval FALSE No data is available to be read
**/
BOOLEAN
EFIAPI
PL011UartPoll (
IN UINTN UartBase
);
#endif
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