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