--- /dev/null
+/** @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 = {
+ //
+ // value field set in SerialDxeInitialize()?
+ //--------- ------------------- -----------------------------
+ 0, // ControlMask
+ 1000 * 1000, // Timeout
+ 0, // BaudRate yes
+ 1, // ReceiveFifoDepth
+ 0, // DataBits yes
+ 0, // Parity yes
+ 0 // StopBits yes
+};
+
+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 = 1000 * 1000;
+ 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;
+}
+
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