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/** @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 - 2016, ARM Ltd. All rights reserved.<BR>
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/PL011UartClockLib.h>
#include <Library/PL011UartLib.h>
#include <Library/SerialPortLib.h>
/** Initialise the serial device hardware with default settings.
@retval RETURN_SUCCESS The serial device was initialised.
@retval RETURN_INVALID_PARAMETER One or more of the default settings
has an unsupported value.
**/
RETURN_STATUS
EFIAPI
SerialPortInitialize (
VOID
)
{
UINT64 BaudRate;
UINT32 ReceiveFifoDepth;
EFI_PARITY_TYPE Parity;
UINT8 DataBits;
EFI_STOP_BITS_TYPE StopBits;
EFI_STATUS Status;
UINT8 Scratch;
BaudRate = PcdGet64 (PcdUartDefaultBaudRate);
ReceiveFifoDepth = 0; // Use default FIFO depth
Parity = (EFI_PARITY_TYPE)PcdGet8 (PcdUartDefaultParity);
DataBits = PcdGet8 (PcdUartDefaultDataBits);
StopBits = (EFI_STOP_BITS_TYPE)PcdGet8 (PcdUartDefaultStopBits);
Status = PL011UartInitializePort (
(UINTN)PcdGet64 (PcdSerialRegisterBase),
PL011UartClockGetFreq (),
&BaudRate,
&ReceiveFifoDepth,
&Parity,
&DataBits,
&StopBits
);
if (EFI_ERROR (Status)) {
return Status;
}
while (SerialPortPoll ()) {
SerialPortRead (&Scratch, sizeof (Scratch));
}
return EFI_SUCCESS;
}
/**
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 TRUE At least one byte of data is available to be read
@retval FALSE No data is available to be read
**/
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 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 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.
@retval EFI_INVALID_PARAMETERS One or more attributes has an unsupported
value.
**/
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 PL011UartInitializePort (
(UINTN)PcdGet64 (PcdSerialRegisterBase),
PL011UartClockGetFreq (),
BaudRate,
ReceiveFifoDepth,
Parity,
DataBits,
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] 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
SerialPortSetControl (
IN UINT32 Control
)
{
return PL011UartSetControl ((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
}
/**
Retrieve the status of the control bits on a serial device.
@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, else 0.
. 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 device.
**/
RETURN_STATUS
EFIAPI
SerialPortGetControl (
OUT UINT32 *Control
)
{
return PL011UartGetControl ((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
}
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