/** @file
Serial driver that layers on top of a Serial Port Library instance.
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Copyright (c) 2013-2014, ARM Ltd. All rights reserved.<BR>
Copyright (c) 2015, Intel Corporation. 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 <Library/UefiBootServicesTableLib.h>
#include <Library/SerialPortLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Protocol/SerialIo.h>
#include <Protocol/DevicePath.h>
typedef struct {
VENDOR_DEVICE_PATH Guid;
UART_DEVICE_PATH Uart;
EFI_DEVICE_PATH_PROTOCOL End;
} SERIAL_DEVICE_PATH;
/**
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.
**/
EFI_STATUS
EFIAPI
SerialReset (
IN EFI_SERIAL_IO_PROTOCOL *This
);
/**
Sets the baud rate, receive FIFO depth, transmit/receive 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 the
device's default interface speed.
@param ReceiveFifoDepth 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
value 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_DEVICE_ERROR The serial device could not be reset.
**/
EFI_STATUS
EFIAPI
SerialSetAttributes (
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.
**/
EFI_STATUS
EFIAPI
SerialSetControl (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN UINT32 Control
);
/**
Retrieves the status of the control 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.
**/
EFI_STATUS
EFIAPI
SerialGetControl (
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.
**/
EFI_STATUS
EFIAPI
SerialWrite (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
IN VOID *Buffer
);
/**
Reads data from 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.
**/
EFI_STATUS
EFIAPI
SerialRead (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
);
EFI_HANDLE mSerialHandle = NULL;
SERIAL_DEVICE_PATH mSerialDevicePath = {
{
{ HARDWARE_DEVICE_PATH, HW_VENDOR_DP, { sizeof (VENDOR_DEVICE_PATH), 0} },
EFI_CALLER_ID_GUID // Use the driver's GUID
},
{
{ MESSAGING_DEVICE_PATH, MSG_UART_DP, { sizeof (UART_DEVICE_PATH), 0} },
0, // Reserved
0, // BaudRate
0, // DataBits
0, // Parity
0 // StopBits
},
{ END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE, { sizeof (EFI_DEVICE_PATH_PROTOCOL), 0 } }
};
//
// Template used to initialize the Serial IO protocols.
//
EFI_SERIAL_IO_MODE mSerialIoMode = {
0, // ControlMask
0, // Timeout
0, // BaudRate
1, // ReceiveFifoDepth
0, // DataBits
0, // Parity
0 // StopBits
};
EFI_SERIAL_IO_PROTOCOL mSerialIoTemplate = {
SERIAL_IO_INTERFACE_REVISION,
SerialReset,
SerialSetAttributes,
SerialSetControl,
SerialGetControl,
SerialWrite,
SerialRead,
&mSerialIoMode
};
/**
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.
**/
EFI_STATUS
EFIAPI
SerialReset (
IN EFI_SERIAL_IO_PROTOCOL *This
)
{
EFI_STATUS Status;
EFI_TPL Tpl;
Status = SerialPortInitialize ();
if (EFI_ERROR (Status)) {
return Status;
}
//
// Set the Serial I/O mode and update the device path
//
Tpl = gBS->RaiseTPL (TPL_NOTIFY);
//
// Set the Serial I/O mode
//
This->Mode->ReceiveFifoDepth = 1;
This->Mode->Timeout = 0;
This->Mode->BaudRate = PcdGet64 (PcdUartDefaultBaudRate);
This->Mode->DataBits = (UINT32) PcdGet8 (PcdUartDefaultDataBits);
This->Mode->Parity = (UINT32) PcdGet8 (PcdUartDefaultParity);
This->Mode->StopBits = (UINT32) PcdGet8 (PcdUartDefaultStopBits);
//
// Check if the device path has actually changed
//
if (mSerialDevicePath.Uart.BaudRate == This->Mode->BaudRate &&
mSerialDevicePath.Uart.DataBits == (UINT8) This->Mode->DataBits &&
mSerialDevicePath.Uart.Parity == (UINT8) This->Mode->Parity &&
mSerialDevicePath.Uart.StopBits == (UINT8) This->Mode->StopBits
) {
gBS->RestoreTPL (Tpl);
return EFI_SUCCESS;
}
//
// Update the device path
//
mSerialDevicePath.Uart.BaudRate = This->Mode->BaudRate;
mSerialDevicePath.Uart.DataBits = (UINT8) This->Mode->DataBits;
mSerialDevicePath.Uart.Parity = (UINT8) This->Mode->Parity;
mSerialDevicePath.Uart.StopBits = (UINT8) This->Mode->StopBits;
Status = gBS->ReinstallProtocolInterface (
mSerialHandle,
&gEfiDevicePathProtocolGuid,
&mSerialDevicePath,
&mSerialDevicePath
);
gBS->RestoreTPL (Tpl);
return Status;
}
/**
Sets the baud rate, receive FIFO depth, transmit/receive 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 the
device's default interface speed.
@param ReceiveFifoDepth 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
value 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_DEVICE_ERROR The serial device could not be reset.
**/
EFI_STATUS
EFIAPI
SerialSetAttributes (
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
)
{
EFI_STATUS Status;
EFI_TPL Tpl;
Status = SerialPortSetAttributes (&BaudRate, &ReceiveFifoDepth, &Timeout, &Parity, &DataBits, &StopBits);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Set the Serial I/O mode and update the device path
//
Tpl = gBS->RaiseTPL (TPL_NOTIFY);
//
// Set the Serial I/O mode
//
This->Mode->ReceiveFifoDepth = ReceiveFifoDepth;
This->Mode->Timeout = Timeout;
This->Mode->BaudRate = BaudRate;
This->Mode->DataBits = (UINT32) DataBits;
This->Mode->Parity = (UINT32) Parity;
This->Mode->StopBits = (UINT32) StopBits;
//
// Check if the device path has actually changed
//
if (mSerialDevicePath.Uart.BaudRate == BaudRate &&
mSerialDevicePath.Uart.DataBits == DataBits &&
mSerialDevicePath.Uart.Parity == (UINT8) Parity &&
mSerialDevicePath.Uart.StopBits == (UINT8) StopBits
) {
gBS->RestoreTPL (Tpl);
return EFI_SUCCESS;
}
//
// Update the device path
//
mSerialDevicePath.Uart.BaudRate = BaudRate;
mSerialDevicePath.Uart.DataBits = DataBits;
mSerialDevicePath.Uart.Parity = (UINT8) Parity;
mSerialDevicePath.Uart.StopBits = (UINT8) StopBits;
Status = gBS->ReinstallProtocolInterface (
mSerialHandle,
&gEfiDevicePathProtocolGuid,
&mSerialDevicePath,
&mSerialDevicePath
);
gBS->RestoreTPL (Tpl);
return Status;
}
/**
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.
**/
EFI_STATUS
EFIAPI
SerialSetControl (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN UINT32 Control
)
{
return SerialPortSetControl (Control);
}
/**
Retrieves the status of the control 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.
**/
EFI_STATUS
EFIAPI
SerialGetControl (
IN EFI_SERIAL_IO_PROTOCOL *This,
OUT UINT32 *Control
)
{
return SerialPortGetControl (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.
**/
EFI_STATUS
EFIAPI
SerialWrite (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
IN VOID *Buffer
)
{
UINTN Count;
Count = SerialPortWrite (Buffer, *BufferSize);
if (Count != *BufferSize) {
*BufferSize = Count;
return EFI_TIMEOUT;
}
return EFI_SUCCESS;
}
/**
Reads data from 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.
**/
EFI_STATUS
EFIAPI
SerialRead (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
UINTN Count;
Count = 0;
if (SerialPortPoll ()) {
Count = SerialPortRead (Buffer, *BufferSize);
}
if (Count != *BufferSize) {
*BufferSize = Count;
return EFI_TIMEOUT;
}
return EFI_SUCCESS;
}
/**
Initialization for the Serial Io Protocol.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval other Some error occurs when executing this entry point.
**/
EFI_STATUS
EFIAPI
SerialDxeInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = SerialPortInitialize ();
if (EFI_ERROR (Status)) {
return Status;
}
mSerialIoMode.BaudRate = PcdGet64 (PcdUartDefaultBaudRate);
mSerialIoMode.DataBits = (UINT32) PcdGet8 (PcdUartDefaultDataBits);
mSerialIoMode.Parity = (UINT32) PcdGet8 (PcdUartDefaultParity);
mSerialIoMode.StopBits = (UINT32) PcdGet8 (PcdUartDefaultStopBits);
mSerialDevicePath.Uart.BaudRate = PcdGet64 (PcdUartDefaultBaudRate);
mSerialDevicePath.Uart.DataBits = PcdGet8 (PcdUartDefaultDataBits);
mSerialDevicePath.Uart.Parity = PcdGet8 (PcdUartDefaultParity);
mSerialDevicePath.Uart.StopBits = PcdGet8 (PcdUartDefaultStopBits);
//
// Make a new handle with Serial IO protocol and its device path on it.
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mSerialHandle,
&gEfiSerialIoProtocolGuid, &mSerialIoTemplate,
&gEfiDevicePathProtocolGuid, &mSerialDevicePath,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}