MdeModulePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdeModulePkg / Universal / SerialDxe / SerialIo.c

/** @file\r
  Serial driver that layers on top of a Serial Port Library instance.\r
\r
  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
  Copyright (c) 2013-2014, ARM Ltd. All rights reserved.<BR>\r
  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/SerialPortLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PcdLib.h>\r
\r
#include <Protocol/SerialIo.h>\r
#include <Protocol/DevicePath.h>\r
\r
typedef struct {\r
  VENDOR_DEVICE_PATH        Guid;\r
  UART_DEVICE_PATH          Uart;\r
  EFI_DEVICE_PATH_PROTOCOL  End;\r
} SERIAL_DEVICE_PATH;\r
\r
/**\r
  Reset the serial device.\r
\r
  @param  This              Protocol instance pointer.\r
\r
  @retval EFI_SUCCESS       The device was reset.\r
  @retval EFI_DEVICE_ERROR  The serial device could not be reset.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialReset (\r
  IN EFI_SERIAL_IO_PROTOCOL *This\r
  );\r
\r
/**\r
  Sets the baud rate, receive FIFO depth, transmit/receive time out, parity,\r
  data bits, and stop bits on a serial device.\r
\r
  @param  This             Protocol instance pointer.\r
  @param  BaudRate         The requested baud rate. A BaudRate value of 0 will use the the\r
                           device's default interface speed.\r
  @param  ReceiveFifoDepth The requested depth of the FIFO on the receive side of the\r
                           serial interface. A ReceiveFifoDepth value of 0 will use\r
                           the device's default FIFO depth.\r
  @param  Timeout          The requested time out for a single character in microseconds.\r
                           This timeout applies to both the transmit and receive side of the\r
                           interface. A Timeout value of 0 will use the device's default time\r
                           out value.\r
  @param  Parity           The type of parity to use on this serial device. A Parity value of\r
                           DefaultParity will use the device's default parity value.\r
  @param  DataBits         The number of data bits to use on the serial device. A DataBits\r
                           value of 0 will use the device's default data bit setting.\r
  @param  StopBits         The number of stop bits to use on this serial device. A StopBits\r
                           value of DefaultStopBits will use the device's default number of\r
                           stop bits.\r
\r
  @retval EFI_SUCCESS           The device was reset.\r
  @retval EFI_INVALID_PARAMETER One or more attributes has an unsupported value.\r
  @retval EFI_DEVICE_ERROR      The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialSetAttributes (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN UINT64                 BaudRate,\r
  IN UINT32                 ReceiveFifoDepth,\r
  IN UINT32                 Timeout,\r
  IN EFI_PARITY_TYPE        Parity,\r
  IN UINT8                  DataBits,\r
  IN EFI_STOP_BITS_TYPE     StopBits\r
  );\r
\r
/**\r
  Set the control bits on a serial device\r
\r
  @param  This             Protocol instance pointer.\r
  @param  Control          Set the bits of Control that are settable.\r
\r
  @retval EFI_SUCCESS      The new control bits were set on the serial device.\r
  @retval EFI_UNSUPPORTED  The serial device does not support this operation.\r
  @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialSetControl (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN UINT32                 Control\r
  );\r
\r
/**\r
  Retrieves the status of the control bits on a serial device\r
\r
  @param  This              Protocol instance pointer.\r
  @param  Control           A pointer to return the current Control signals from the serial device.\r
\r
  @retval EFI_SUCCESS       The control bits were read from the serial device.\r
  @retval EFI_DEVICE_ERROR  The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialGetControl (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  OUT UINT32                *Control\r
  );\r
\r
/**\r
  Writes data to a serial device.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  BufferSize        On input, the size of the Buffer. On output, the amount of\r
                            data actually written.\r
  @param  Buffer            The buffer of data to write\r
\r
  @retval EFI_SUCCESS       The data was written.\r
  @retval EFI_DEVICE_ERROR  The device reported an error.\r
  @retval EFI_TIMEOUT       The data write was stopped due to a timeout.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialWrite (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN OUT UINTN              *BufferSize,\r
  IN VOID                   *Buffer\r
  );\r
\r
/**\r
  Reads data from a serial device.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  BufferSize        On input, the size of the Buffer. On output, the amount of\r
                            data returned in Buffer.\r
  @param  Buffer            The buffer to return the data into.\r
\r
  @retval EFI_SUCCESS       The data was read.\r
  @retval EFI_DEVICE_ERROR  The device reported an error.\r
  @retval EFI_TIMEOUT       The data write was stopped due to a timeout.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialRead (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN OUT UINTN              *BufferSize,\r
  OUT VOID                  *Buffer\r
  );\r
\r
EFI_HANDLE mSerialHandle = NULL;\r
\r
SERIAL_DEVICE_PATH mSerialDevicePath = {\r
  {\r
    { HARDWARE_DEVICE_PATH, HW_VENDOR_DP, { sizeof (VENDOR_DEVICE_PATH), 0} },\r
    EFI_CALLER_ID_GUID  // Use the driver's GUID\r
  },\r
  {\r
    { MESSAGING_DEVICE_PATH, MSG_UART_DP, { sizeof (UART_DEVICE_PATH), 0} },\r
    0,                  // Reserved\r
    0,                  // BaudRate\r
    0,                  // DataBits\r
    0,                  // Parity\r
    0                   // StopBits\r
  },\r
  { END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE, { sizeof (EFI_DEVICE_PATH_PROTOCOL), 0 } }\r
};\r
\r
//\r
// Template used to initialize the Serial IO protocols.\r
//\r
EFI_SERIAL_IO_MODE mSerialIoMode = {\r
  //\r
  //    value  field                set in SerialDxeInitialize()?\r
  //---------  -------------------  -----------------------------\r
            0, // ControlMask\r
  1000 * 1000, // Timeout\r
            0, // BaudRate          yes\r
            1, // ReceiveFifoDepth\r
            0, // DataBits          yes\r
            0, // Parity            yes\r
            0  // StopBits          yes\r
};\r
\r
EFI_SERIAL_IO_PROTOCOL mSerialIoTemplate = {\r
  SERIAL_IO_INTERFACE_REVISION,\r
  SerialReset,\r
  SerialSetAttributes,\r
  SerialSetControl,\r
  SerialGetControl,\r
  SerialWrite,\r
  SerialRead,\r
  &mSerialIoMode\r
};\r
\r
/**\r
  Reset the serial device.\r
\r
  @param  This              Protocol instance pointer.\r
\r
  @retval EFI_SUCCESS       The device was reset.\r
  @retval EFI_DEVICE_ERROR  The serial device could not be reset.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialReset (\r
  IN EFI_SERIAL_IO_PROTOCOL *This\r
  )\r
{\r
  EFI_STATUS    Status;\r
\r
  Status = SerialPortInitialize ();\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Go set the current attributes\r
  //\r
  Status = This->SetAttributes (\r
                   This,\r
                   This->Mode->BaudRate,\r
                   This->Mode->ReceiveFifoDepth,\r
                   This->Mode->Timeout,\r
                   (EFI_PARITY_TYPE) This->Mode->Parity,\r
                   (UINT8) This->Mode->DataBits,\r
                   (EFI_STOP_BITS_TYPE) This->Mode->StopBits\r
                   );\r
\r
  //\r
  // The serial device may not support some of the attributes. To prevent\r
  // later failure, always return EFI_SUCCESS when SetAttributes is returning\r
  // EFI_INVALID_PARAMETER.\r
  //\r
  if (Status == EFI_INVALID_PARAMETER) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Sets the baud rate, receive FIFO depth, transmit/receive time out, parity,\r
  data bits, and stop bits on a serial device.\r
\r
  @param  This             Protocol instance pointer.\r
  @param  BaudRate         The requested baud rate. A BaudRate value of 0 will use the the\r
                           device's default interface speed.\r
  @param  ReceiveFifoDepth The requested depth of the FIFO on the receive side of the\r
                           serial interface. A ReceiveFifoDepth value of 0 will use\r
                           the device's default FIFO depth.\r
  @param  Timeout          The requested time out for a single character in microseconds.\r
                           This timeout applies to both the transmit and receive side of the\r
                           interface. A Timeout value of 0 will use the device's default time\r
                           out value.\r
  @param  Parity           The type of parity to use on this serial device. A Parity value of\r
                           DefaultParity will use the device's default parity value.\r
  @param  DataBits         The number of data bits to use on the serial device. A DataBits\r
                           value of 0 will use the device's default data bit setting.\r
  @param  StopBits         The number of stop bits to use on this serial device. A StopBits\r
                           value of DefaultStopBits will use the device's default number of\r
                           stop bits.\r
\r
  @retval EFI_SUCCESS           The device was reset.\r
  @retval EFI_INVALID_PARAMETER One or more attributes has an unsupported value.\r
  @retval EFI_DEVICE_ERROR      The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialSetAttributes (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN UINT64                 BaudRate,\r
  IN UINT32                 ReceiveFifoDepth,\r
  IN UINT32                 Timeout,\r
  IN EFI_PARITY_TYPE        Parity,\r
  IN UINT8                  DataBits,\r
  IN EFI_STOP_BITS_TYPE     StopBits\r
  )\r
{\r
  EFI_STATUS                Status;\r
  EFI_TPL                   Tpl;\r
  UINT64                    OriginalBaudRate;\r
  UINT32                    OriginalReceiveFifoDepth;\r
  UINT32                    OriginalTimeout;\r
  EFI_PARITY_TYPE           OriginalParity;\r
  UINT8                     OriginalDataBits;\r
  EFI_STOP_BITS_TYPE        OriginalStopBits;\r
\r
  //\r
  // Preserve the original input values in case\r
  // SerialPortSetAttributes() updates the input/output\r
  // parameters even on error.\r
  //\r
  OriginalBaudRate = BaudRate;\r
  OriginalReceiveFifoDepth = ReceiveFifoDepth;\r
  OriginalTimeout = Timeout;\r
  OriginalParity = Parity;\r
  OriginalDataBits = DataBits;\r
  OriginalStopBits = StopBits;\r
  Status = SerialPortSetAttributes (&BaudRate, &ReceiveFifoDepth, &Timeout, &Parity, &DataBits, &StopBits);\r
  if (EFI_ERROR (Status)) {\r
    //\r
    // If it is just to set Timeout value and unsupported is returned,\r
    // do not return error.\r
    //\r
    if ((Status == EFI_UNSUPPORTED) &&\r
        (This->Mode->Timeout          != OriginalTimeout) &&\r
        (This->Mode->ReceiveFifoDepth == OriginalReceiveFifoDepth) &&\r
        (This->Mode->BaudRate         == OriginalBaudRate) &&\r
        (This->Mode->DataBits         == (UINT32) OriginalDataBits) &&\r
        (This->Mode->Parity           == (UINT32) OriginalParity) &&\r
        (This->Mode->StopBits         == (UINT32) OriginalStopBits)) {\r
      //\r
      // Restore to the original input values.\r
      //\r
      BaudRate = OriginalBaudRate;\r
      ReceiveFifoDepth = OriginalReceiveFifoDepth;\r
      Timeout = OriginalTimeout;\r
      Parity = OriginalParity;\r
      DataBits = OriginalDataBits;\r
      StopBits = OriginalStopBits;\r
      Status = EFI_SUCCESS;\r
    } else if (Status == EFI_INVALID_PARAMETER || Status == EFI_UNSUPPORTED) {\r
      return EFI_INVALID_PARAMETER;\r
    } else {\r
      return EFI_DEVICE_ERROR;\r
    }\r
  }\r
\r
  //\r
  // Set the Serial I/O mode and update the device path\r
  //\r
\r
  Tpl = gBS->RaiseTPL (TPL_NOTIFY);\r
\r
  //\r
  // Set the Serial I/O mode\r
  //\r
  This->Mode->ReceiveFifoDepth  = ReceiveFifoDepth;\r
  This->Mode->Timeout           = Timeout;\r
  This->Mode->BaudRate          = BaudRate;\r
  This->Mode->DataBits          = (UINT32) DataBits;\r
  This->Mode->Parity            = (UINT32) Parity;\r
  This->Mode->StopBits          = (UINT32) StopBits;\r
\r
  //\r
  // Check if the device path has actually changed\r
  //\r
  if (mSerialDevicePath.Uart.BaudRate == BaudRate &&\r
      mSerialDevicePath.Uart.DataBits == DataBits &&\r
      mSerialDevicePath.Uart.Parity   == (UINT8) Parity &&\r
      mSerialDevicePath.Uart.StopBits == (UINT8) StopBits\r
     ) {\r
    gBS->RestoreTPL (Tpl);\r
    return EFI_SUCCESS;\r
  }\r
\r
  //\r
  // Update the device path\r
  //\r
  mSerialDevicePath.Uart.BaudRate = BaudRate;\r
  mSerialDevicePath.Uart.DataBits = DataBits;\r
  mSerialDevicePath.Uart.Parity   = (UINT8) Parity;\r
  mSerialDevicePath.Uart.StopBits = (UINT8) StopBits;\r
\r
  Status = gBS->ReinstallProtocolInterface (\r
                  mSerialHandle,\r
                  &gEfiDevicePathProtocolGuid,\r
                  &mSerialDevicePath,\r
                  &mSerialDevicePath\r
                  );\r
\r
  gBS->RestoreTPL (Tpl);\r
\r
  return Status;\r
}\r
\r
/**\r
  Set the control bits on a serial device\r
\r
  @param  This             Protocol instance pointer.\r
  @param  Control          Set the bits of Control that are settable.\r
\r
  @retval EFI_SUCCESS      The new control bits were set on the serial device.\r
  @retval EFI_UNSUPPORTED  The serial device does not support this operation.\r
  @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialSetControl (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN UINT32                 Control\r
  )\r
{\r
  return SerialPortSetControl (Control);\r
}\r
\r
/**\r
  Retrieves the status of the control bits on a serial device\r
\r
  @param  This              Protocol instance pointer.\r
  @param  Control           A pointer to return the current Control signals from the serial device.\r
\r
  @retval EFI_SUCCESS       The control bits were read from the serial device.\r
  @retval EFI_DEVICE_ERROR  The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialGetControl (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  OUT UINT32                *Control\r
  )\r
{\r
  return SerialPortGetControl (Control);\r
}\r
\r
/**\r
  Writes data to a serial device.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  BufferSize        On input, the size of the Buffer. On output, the amount of\r
                            data actually written.\r
  @param  Buffer            The buffer of data to write\r
\r
  @retval EFI_SUCCESS       The data was written.\r
  @retval EFI_DEVICE_ERROR  The device reported an error.\r
  @retval EFI_TIMEOUT       The data write was stopped due to a timeout.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialWrite (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN OUT UINTN              *BufferSize,\r
  IN VOID                   *Buffer\r
  )\r
{\r
  UINTN Count;\r
\r
  Count = SerialPortWrite (Buffer, *BufferSize);\r
\r
  if (Count != *BufferSize) {\r
    *BufferSize = Count;\r
    return EFI_TIMEOUT;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Reads data from a serial device.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  BufferSize        On input, the size of the Buffer. On output, the amount of\r
                            data returned in Buffer.\r
  @param  Buffer            The buffer to return the data into.\r
\r
  @retval EFI_SUCCESS       The data was read.\r
  @retval EFI_DEVICE_ERROR  The device reported an error.\r
  @retval EFI_TIMEOUT       The data write was stopped due to a timeout.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialRead (\r
  IN EFI_SERIAL_IO_PROTOCOL *This,\r
  IN OUT UINTN              *BufferSize,\r
  OUT VOID                  *Buffer\r
  )\r
{\r
  UINTN Count;\r
  UINTN TimeOut;\r
\r
  Count = 0;\r
\r
  while (Count < *BufferSize) {\r
    TimeOut = 0;\r
    while (TimeOut < mSerialIoMode.Timeout) {\r
      if (SerialPortPoll ()) {\r
        break;\r
      }\r
      gBS->Stall (10);\r
      TimeOut += 10;\r
    }\r
    if (TimeOut >= mSerialIoMode.Timeout) {\r
      break;\r
    }\r
    SerialPortRead (Buffer, 1);\r
    Count++;\r
    Buffer = (VOID *) ((UINT8 *) Buffer + 1);\r
  }\r
\r
  if (Count != *BufferSize) {\r
    *BufferSize = Count;\r
    return EFI_TIMEOUT;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Initialization for the Serial Io Protocol.\r
\r
  @param[in] ImageHandle    The firmware allocated handle for the EFI image.\r
  @param[in] SystemTable    A pointer to the EFI System Table.\r
\r
  @retval EFI_SUCCESS       The entry point is executed successfully.\r
  @retval other             Some error occurs when executing this entry point.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SerialDxeInitialize (\r
  IN EFI_HANDLE         ImageHandle,\r
  IN EFI_SYSTEM_TABLE   *SystemTable\r
  )\r
{\r
  EFI_STATUS            Status;\r
\r
  mSerialIoMode.BaudRate = PcdGet64 (PcdUartDefaultBaudRate);\r
  mSerialIoMode.DataBits = (UINT32) PcdGet8 (PcdUartDefaultDataBits);\r
  mSerialIoMode.Parity   = (UINT32) PcdGet8 (PcdUartDefaultParity);\r
  mSerialIoMode.StopBits = (UINT32) PcdGet8 (PcdUartDefaultStopBits);\r
  mSerialIoMode.ReceiveFifoDepth = PcdGet16 (PcdUartDefaultReceiveFifoDepth);\r
  mSerialDevicePath.Uart.BaudRate = PcdGet64 (PcdUartDefaultBaudRate);\r
  mSerialDevicePath.Uart.DataBits = PcdGet8 (PcdUartDefaultDataBits);\r
  mSerialDevicePath.Uart.Parity   = PcdGet8 (PcdUartDefaultParity);\r
  mSerialDevicePath.Uart.StopBits = PcdGet8 (PcdUartDefaultStopBits);\r
\r
  //\r
  // Issue a reset to initialize the Serial Port\r
  //\r
  Status = mSerialIoTemplate.Reset (&mSerialIoTemplate);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Make a new handle with Serial IO protocol and its device path on it.\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &mSerialHandle,\r
                  &gEfiSerialIoProtocolGuid,   &mSerialIoTemplate,\r
                  &gEfiDevicePathProtocolGuid, &mSerialDevicePath,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return Status;\r
}\r
\r