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/** @file
Serial IO protocol as defined in the UEFI 2.0 specification.
Abstraction of a basic serial device. Targeted at 16550 UART, but
could be much more generic.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __SERIAL_IO_PROTOCOL_H__
#define __SERIAL_IO_PROTOCOL_H__
FILE_LICENCE ( BSD2_PATENT );
#define EFI_SERIAL_IO_PROTOCOL_GUID \
{ \
0xBB25CF6F, 0xF1D4, 0x11D2, {0x9A, 0x0C, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0xFD } \
}
#define EFI_SERIAL_TERMINAL_DEVICE_TYPE_GUID \
{ \
0X6AD9A60F, 0X5815, 0X4C7C, { 0X8A, 0X10, 0X50, 0X53, 0XD2, 0XBF, 0X7A, 0X1B } \
}
///
/// Protocol GUID defined in EFI1.1.
///
#define SERIAL_IO_PROTOCOL EFI_SERIAL_IO_PROTOCOL_GUID
typedef struct _EFI_SERIAL_IO_PROTOCOL EFI_SERIAL_IO_PROTOCOL;
///
/// Backward-compatible with EFI1.1.
///
typedef EFI_SERIAL_IO_PROTOCOL SERIAL_IO_INTERFACE;
///
/// 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.
///
typedef enum {
DefaultParity,
NoParity,
EvenParity,
OddParity,
MarkParity,
SpaceParity
} EFI_PARITY_TYPE;
///
/// Stop bits type
///
typedef enum {
DefaultStopBits,
OneStopBit,
OneFiveStopBits,
TwoStopBits
} EFI_STOP_BITS_TYPE;
//
// define for Control bits, grouped by read only, write only, and read write
//
//
// Read Only
//
#define EFI_SERIAL_CLEAR_TO_SEND 0x00000010
#define EFI_SERIAL_DATA_SET_READY 0x00000020
#define EFI_SERIAL_RING_INDICATE 0x00000040
#define EFI_SERIAL_CARRIER_DETECT 0x00000080
#define EFI_SERIAL_INPUT_BUFFER_EMPTY 0x00000100
#define EFI_SERIAL_OUTPUT_BUFFER_EMPTY 0x00000200
//
// Write Only
//
#define EFI_SERIAL_REQUEST_TO_SEND 0x00000002
#define EFI_SERIAL_DATA_TERMINAL_READY 0x00000001
//
// Read Write
//
#define EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE 0x00001000
#define EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE 0x00002000
#define EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE 0x00004000
//
// Serial IO Member Functions
//
/**
Reset the serial device.
@param This Protocol instance pointer.
@retval EFI_SUCCESS The device was reset.
@retval EFI_DEVICE_ERROR The serial device could not be reset.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SERIAL_RESET)(
IN EFI_SERIAL_IO_PROTOCOL *This
);
/**
Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
data bits, and stop bits on a serial device.
@param This Protocol instance pointer.
@param BaudRate The requested baud rate. A BaudRate value of 0 will use the
device's default interface speed.
@param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
serial interface. A ReceiveFifoDepth value of 0 will use
the device's default FIFO depth.
@param Timeout The requested time out for a single character in microseconds.
This timeout applies to both the transmit and receive side of the
interface. A Timeout value of 0 will use the device's default time
out value.
@param Parity The type of parity to use on this serial device. A Parity value of
DefaultParity will use the device's default parity value.
@param DataBits The number of data bits to use on the serial device. A DataBits
vaule of 0 will use the device's default data bit setting.
@param StopBits The number of stop bits to use on this serial device. A StopBits
value of DefaultStopBits will use the device's default number of
stop bits.
@retval EFI_SUCCESS The device was reset.
@retval EFI_INVALID_PARAMETER One or more attributes has an unsupported value.
@retval EFI_DEVICE_ERROR The serial device is not functioning correctly.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SERIAL_SET_ATTRIBUTES)(
IN EFI_SERIAL_IO_PROTOCOL *This,
IN UINT64 BaudRate,
IN UINT32 ReceiveFifoDepth,
IN UINT32 Timeout,
IN EFI_PARITY_TYPE Parity,
IN UINT8 DataBits,
IN EFI_STOP_BITS_TYPE StopBits
);
/**
Set the control bits on a serial device
@param This Protocol instance pointer.
@param Control Set the bits of Control that are settable.
@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.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SERIAL_SET_CONTROL_BITS)(
IN EFI_SERIAL_IO_PROTOCOL *This,
IN UINT32 Control
);
/**
Retrieves the status of thecontrol bits on a serial device
@param This Protocol instance pointer.
@param Control A pointer to return the current Control signals 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.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SERIAL_GET_CONTROL_BITS)(
IN EFI_SERIAL_IO_PROTOCOL *This,
OUT UINT32 *Control
);
/**
Writes data to a serial device.
@param This Protocol instance pointer.
@param BufferSize On input, the size of the Buffer. On output, the amount of
data actually written.
@param Buffer The buffer of data to write
@retval EFI_SUCCESS The data was written.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_TIMEOUT The data write was stopped due to a timeout.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SERIAL_WRITE)(
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
IN VOID *Buffer
);
/**
Writes data to a serial device.
@param This Protocol instance pointer.
@param BufferSize On input, the size of the Buffer. On output, the amount of
data returned in Buffer.
@param Buffer The buffer to return the data into.
@retval EFI_SUCCESS The data was read.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_TIMEOUT The data write was stopped due to a timeout.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SERIAL_READ)(
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
);
/**
@par Data Structure Description:
The data values in SERIAL_IO_MODE are read-only and are updated by the code
that produces the SERIAL_IO_PROTOCOL member functions.
@param ControlMask
A mask for the Control bits that the device supports. The device
must always support the Input Buffer Empty control bit.
@param TimeOut
If applicable, the number of microseconds to wait before timing out
a Read or Write operation.
@param BaudRate
If applicable, the current baud rate setting of the device; otherwise,
baud rate has the value of zero to indicate that device runs at the
device's designed speed.
@param ReceiveFifoDepth
The number of characters the device will buffer on input
@param DataBits
The number of characters the device will buffer on input
@param Parity
If applicable, this is the EFI_PARITY_TYPE that is computed or
checked as each character is transmitted or reveived. If the device
does not support parity the value is the default parity value.
@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 values.
**/
typedef struct {
UINT32 ControlMask;
//
// current Attributes
//
UINT32 Timeout;
UINT64 BaudRate;
UINT32 ReceiveFifoDepth;
UINT32 DataBits;
UINT32 Parity;
UINT32 StopBits;
} EFI_SERIAL_IO_MODE;
#define EFI_SERIAL_IO_PROTOCOL_REVISION 0x00010000
#define EFI_SERIAL_IO_PROTOCOL_REVISION1p1 0x00010001
#define SERIAL_IO_INTERFACE_REVISION EFI_SERIAL_IO_PROTOCOL_REVISION
///
/// The Serial I/O protocol is used to communicate with UART-style serial devices.
/// These can be standard UART serial ports in PC-AT systems, serial ports attached
/// to a USB interface, or potentially any character-based I/O device.
///
struct _EFI_SERIAL_IO_PROTOCOL {
///
/// The revision to which the EFI_SERIAL_IO_PROTOCOL adheres. All future revisions
/// must be backwards compatible. If a future version is not backwards compatible,
/// it is not the same GUID.
///
UINT32 Revision;
EFI_SERIAL_RESET Reset;
EFI_SERIAL_SET_ATTRIBUTES SetAttributes;
EFI_SERIAL_SET_CONTROL_BITS SetControl;
EFI_SERIAL_GET_CONTROL_BITS GetControl;
EFI_SERIAL_WRITE Write;
EFI_SERIAL_READ Read;
///
/// Pointer to SERIAL_IO_MODE data.
///
EFI_SERIAL_IO_MODE *Mode;
///
/// Pointer to a GUID identifying the device connected to the serial port.
/// This field is NULL when the protocol is installed by the serial port
/// driver and may be populated by a platform driver for a serial port
/// with a known device attached. The field will remain NULL if there is
/// no platform serial device identification information available.
///
CONST EFI_GUID *DeviceTypeGuid; // Revision 1.1
};
extern EFI_GUID gEfiSerialIoProtocolGuid;
extern EFI_GUID gEfiSerialTerminalDeviceTypeGuid;
#endif
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