winntserialio.c

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/*++

Copyright (c) 2004 - 2005, Intel Corporation                                                         
All rights reserved. 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.             

Module Name:

  WinNtSerialIo.c

Abstract:

  Our DriverBinding member functions operate on the handles
  created by the NT Bus driver.

  Handle(1) - WinNtIo - DevicePath(1)

  If a serial port is added to the system this driver creates a new handle. 
  The new handle is required, since the serial device must add an UART device
  pathnode.

  Handle(2) - SerialIo - DevicePath(1)\UART

  The driver then adds a gEfiWinNtSerialPortGuid as a protocol to Handle(1).
  The instance data for this protocol is the private data used to create
  Handle(2).

  Handle(1) - WinNtIo - DevicePath(1) - WinNtSerialPort

  If the driver is unloaded Handle(2) is removed from the system and 
  gEfiWinNtSerialPortGuid is removed from Handle(1).

  Note: Handle(1) is any handle created by the Win NT Bus driver that is passed
  into the DriverBinding member functions of this driver. This driver requires
  a Handle(1) to contain a WinNtIo protocol, a DevicePath protocol, and 
  the TypeGuid in the WinNtIo must be gEfiWinNtSerialPortGuid. 
  
  If Handle(1) contains a gEfiWinNtSerialPortGuid protocol then the driver is 
  loaded on the device.

--*/

#include "WinNtSerialIo.h"

EFI_DRIVER_BINDING_PROTOCOL gWinNtSerialIoDriverBinding = {
  WinNtSerialIoDriverBindingSupported,
  WinNtSerialIoDriverBindingStart,
  WinNtSerialIoDriverBindingStop,
  0x10,
  NULL,
  NULL
};

EFI_DRIVER_ENTRY_POINT (InitializeWinNtSerialIo)

EFI_STATUS
EFIAPI
InitializeWinNtSerialIo (
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
/*++

Routine Description:

  Intialize Win32 windows to act as EFI SimpleTextOut and SimpleTextIn windows. . 

Arguments:

  (Standard EFI Image entry - EFI_IMAGE_ENTRY_POINT)

Returns: 

  EFI_STATUS

--*/
// TODO:    ImageHandle - add argument and description to function comment
// TODO:    SystemTable - add argument and description to function comment
{
  return EfiLibInstallAllDriverProtocols (
          ImageHandle,
          SystemTable,
          &gWinNtSerialIoDriverBinding,
          ImageHandle,
          &gWinNtSerialIoComponentName,
          NULL,
          NULL
          );
}

STATIC
EFI_STATUS
EFIAPI
WinNtSerialIoDriverBindingSupported (
  IN  EFI_DRIVER_BINDING_PROTOCOL   *This,
  IN  EFI_HANDLE                    Handle,
  IN  EFI_DEVICE_PATH_PROTOCOL      *RemainingDevicePath
  )
/*++

Routine Description:

Arguments:

Returns:

  None

--*/
// TODO:    This - add argument and description to function comment
// TODO:    Handle - add argument and description to function comment
// TODO:    RemainingDevicePath - add argument and description to function comment
// TODO:    EFI_SUCCESS - add return value to function comment
// TODO:    EFI_SUCCESS - add return value to function comment
{
  EFI_STATUS                Status;
  EFI_DEVICE_PATH_PROTOCOL  *ParentDevicePath;
  EFI_WIN_NT_IO_PROTOCOL    *WinNtIo;
  UART_DEVICE_PATH          *UartNode;

  //
  // Open the IO Abstraction(s) needed to perform the supported test
  //
  Status = gBS->OpenProtocol (
                  Handle,
                  &gEfiDevicePathProtocolGuid,
                  &ParentDevicePath,
                  This->DriverBindingHandle,
                  Handle,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (Status == EFI_ALREADY_STARTED) {
    return EFI_SUCCESS;
  }

  if (EFI_ERROR (Status)) {
    return Status;
  }

  gBS->CloseProtocol (
        Handle,
        &gEfiDevicePathProtocolGuid,
        This->DriverBindingHandle,
        Handle
        );

  Status = gBS->OpenProtocol (
                  Handle,
                  &gEfiWinNtIoProtocolGuid,
                  &WinNtIo,
                  This->DriverBindingHandle,
                  Handle,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (Status == EFI_ALREADY_STARTED) {
    return EFI_SUCCESS;
  }

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Make sure that the WinNt Thunk Protocol is valid
  //
  if (WinNtIo->WinNtThunk->Signature != EFI_WIN_NT_THUNK_PROTOCOL_SIGNATURE) {
    Status = EFI_UNSUPPORTED;
    goto Error;
  }
  
  //
  // Check the GUID to see if this is a handle type the driver supports
  //
  if (!EfiCompareGuid (WinNtIo->TypeGuid, &gEfiWinNtSerialPortGuid)) {
    Status = EFI_UNSUPPORTED;
    goto Error;
  }

  if (RemainingDevicePath != NULL) {
    Status    = EFI_UNSUPPORTED;
    UartNode  = (UART_DEVICE_PATH *) RemainingDevicePath;
    if (UartNode->Header.Type != MESSAGING_DEVICE_PATH ||
        UartNode->Header.SubType != MSG_UART_DP ||
        DevicePathNodeLength((EFI_DEVICE_PATH_PROTOCOL *)UartNode) != sizeof(UART_DEVICE_PATH)) {
      goto Error;
    }
    if (UartNode->BaudRate < 0 || UartNode->BaudRate > SERIAL_PORT_MAX_BAUD_RATE) {
      goto Error;
    }
    if (UartNode->Parity < NoParity || UartNode->Parity > SpaceParity) {
      goto Error;
    }
    if (UartNode->DataBits < 5 || UartNode->DataBits > 8) {
      goto Error;
    }
    if (UartNode->StopBits < OneStopBit || UartNode->StopBits > TwoStopBits) {
      goto Error;
    }
    if ((UartNode->DataBits == 5) && (UartNode->StopBits == TwoStopBits)) {
      goto Error;
    }
    if ((UartNode->DataBits >= 6) && (UartNode->DataBits <= 8) && (UartNode->StopBits == OneFiveStopBits)) {
      goto Error;
    }
    Status = EFI_SUCCESS;
  }

Error:
  //
  // Close the I/O Abstraction(s) used to perform the supported test
  //
  gBS->CloseProtocol (
        Handle,
        &gEfiWinNtIoProtocolGuid,
        This->DriverBindingHandle,
        Handle
        );

  return Status;
}

STATIC
EFI_STATUS
EFIAPI
WinNtSerialIoDriverBindingStart (
  IN  EFI_DRIVER_BINDING_PROTOCOL   *This,
  IN  EFI_HANDLE                    Handle,
  IN  EFI_DEVICE_PATH_PROTOCOL      *RemainingDevicePath
  )
/*++

Routine Description:

Arguments:

Returns:

  None

--*/
// TODO:    This - add argument and description to function comment
// TODO:    Handle - add argument and description to function comment
// TODO:    RemainingDevicePath - add argument and description to function comment
// TODO:    EFI_SUCCESS - add return value to function comment
// TODO:    EFI_SUCCESS - add return value to function comment
{
  EFI_STATUS                          Status;
  EFI_WIN_NT_IO_PROTOCOL              *WinNtIo;
  WIN_NT_SERIAL_IO_PRIVATE_DATA       *Private;
  HANDLE                              NtHandle;
  UART_DEVICE_PATH                    Node;
  EFI_DEVICE_PATH_PROTOCOL            *ParentDevicePath;
  EFI_OPEN_PROTOCOL_INFORMATION_ENTRY *OpenInfoBuffer;
  UINTN                               EntryCount;
  UINTN                               Index;
  EFI_SERIAL_IO_PROTOCOL              *SerialIo;

  Private   = NULL;
  NtHandle  = INVALID_HANDLE_VALUE;

  //
  // Grab the protocols we need
  //
  Status = gBS->OpenProtocol (
                  Handle,
                  &gEfiDevicePathProtocolGuid,
                  &ParentDevicePath,
                  This->DriverBindingHandle,
                  Handle,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
    return Status;
  }

  //
  // Grab the IO abstraction we need to get any work done
  //
  Status = gBS->OpenProtocol (
                  Handle,
                  &gEfiWinNtIoProtocolGuid,
                  &WinNtIo,
                  This->DriverBindingHandle,
                  Handle,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
    gBS->CloseProtocol (
          Handle,
          &gEfiDevicePathProtocolGuid,
          This->DriverBindingHandle,
          Handle
          );
    return Status;
  }

  if (Status == EFI_ALREADY_STARTED) {

    if (RemainingDevicePath == NULL) {
      return EFI_SUCCESS;
    }

    //
    // Make sure a child handle does not already exist.  This driver can only
    // produce one child per serial port.
    //
    Status = gBS->OpenProtocolInformation (
                    Handle,
                    &gEfiWinNtIoProtocolGuid,
                    &OpenInfoBuffer,
                    &EntryCount
                    );
    if (EFI_ERROR (Status)) {
      return Status;
    }

    Status = EFI_ALREADY_STARTED;
    for (Index = 0; Index < EntryCount; Index++) {
      if (OpenInfoBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
        Status = gBS->OpenProtocol (
                        OpenInfoBuffer[Index].ControllerHandle,
                        &gEfiSerialIoProtocolGuid,
                        &SerialIo,
                        This->DriverBindingHandle,
                        Handle,
                        EFI_OPEN_PROTOCOL_GET_PROTOCOL
                        );
        if (!EFI_ERROR (Status)) {
          EfiCopyMem (&Node, RemainingDevicePath, sizeof (UART_DEVICE_PATH));
          Status = SerialIo->SetAttributes (
                              SerialIo,
                              Node.BaudRate,
                              SerialIo->Mode->ReceiveFifoDepth,
                              SerialIo->Mode->Timeout,
                              Node.Parity,
                              Node.DataBits,
                              Node.StopBits
                              );
        }
        break;
      }
    }

    gBS->FreePool (OpenInfoBuffer);
    return Status;
  }

  //
  // Check to see if we can access the hardware device. If it's Open in NT we
  // will not get access.
  //
  NtHandle = WinNtIo->WinNtThunk->CreateFile (
                                    WinNtIo->EnvString,
                                    GENERIC_READ | GENERIC_WRITE,
                                    0,
                                    NULL,
                                    OPEN_EXISTING,
                                    0,
                                    NULL
                                    );
  if (NtHandle == INVALID_HANDLE_VALUE) {
    Status = EFI_DEVICE_ERROR;
    goto Error;
  }

  //
  // Construct Private data
  //
  Status = gBS->AllocatePool (
                  EfiBootServicesData,
                  sizeof (WIN_NT_SERIAL_IO_PRIVATE_DATA),
                  &Private
                  );
  if (EFI_ERROR (Status)) {
    goto Error;
  }

  //
  // This signature must be valid before any member function is called
  //
  Private->Signature              = WIN_NT_SERIAL_IO_PRIVATE_DATA_SIGNATURE;
  Private->NtHandle               = NtHandle;
  Private->ControllerHandle       = Handle;
  Private->Handle                 = NULL;
  Private->WinNtThunk             = WinNtIo->WinNtThunk;
  Private->ParentDevicePath       = ParentDevicePath;
  Private->ControllerNameTable    = NULL;

  Private->SoftwareLoopbackEnable = FALSE;
  Private->HardwareLoopbackEnable = FALSE;
  Private->HardwareFlowControl    = FALSE;
  Private->Fifo.First             = 0;
  Private->Fifo.Last              = 0;
  Private->Fifo.Surplus           = SERIAL_MAX_BUFFER_SIZE;

  EfiLibAddUnicodeString (
    "eng",
    gWinNtSerialIoComponentName.SupportedLanguages,
    &Private->ControllerNameTable,
    WinNtIo->EnvString
    );

  Private->SerialIo.Revision      = SERIAL_IO_INTERFACE_REVISION;
  Private->SerialIo.Reset         = WinNtSerialIoReset;
  Private->SerialIo.SetAttributes = WinNtSerialIoSetAttributes;
  Private->SerialIo.SetControl    = WinNtSerialIoSetControl;
  Private->SerialIo.GetControl    = WinNtSerialIoGetControl;
  Private->SerialIo.Write         = WinNtSerialIoWrite;
  Private->SerialIo.Read          = WinNtSerialIoRead;
  Private->SerialIo.Mode          = &Private->SerialIoMode;

  if (RemainingDevicePath != NULL) {
    //
    // Match the configuration of the RemainingDevicePath. IsHandleSupported()
    // already checked to make sure the RemainingDevicePath contains settings
    // that we can support.
    //
    EfiCopyMem (&Private->UartDevicePath, RemainingDevicePath, sizeof (UART_DEVICE_PATH));
  } else {
    //
    // Build the device path by appending the UART node to the ParentDevicePath
    // from the WinNtIo handle. The Uart setings are zero here, since
    // SetAttribute() will update them to match the default setings.
    //
    EfiZeroMem (&Private->UartDevicePath, sizeof (UART_DEVICE_PATH));
    Private->UartDevicePath.Header.Type     = MESSAGING_DEVICE_PATH;
    Private->UartDevicePath.Header.SubType  = MSG_UART_DP;
    SetDevicePathNodeLength ((EFI_DEVICE_PATH_PROTOCOL *) &Private->UartDevicePath, sizeof (UART_DEVICE_PATH));
  }

  //
  // Build the device path by appending the UART node to the ParentDevicePath
  // from the WinNtIo handle. The Uart setings are zero here, since
  // SetAttribute() will update them to match the current setings.
  //
  Private->DevicePath = EfiAppendDevicePathNode (
                          ParentDevicePath,
                          (EFI_DEVICE_PATH_PROTOCOL *) &Private->UartDevicePath
                          );
  if (Private->DevicePath == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto Error;
  }

  //
  // Fill in Serial I/O Mode structure based on either the RemainingDevicePath or defaults.
  //
  Private->SerialIoMode.ControlMask       = SERIAL_CONTROL_MASK;
  Private->SerialIoMode.Timeout           = SERIAL_TIMEOUT_DEFAULT;
  Private->SerialIoMode.BaudRate          = Private->UartDevicePath.BaudRate;
  Private->SerialIoMode.ReceiveFifoDepth  = SERIAL_FIFO_DEFAULT;
  Private->SerialIoMode.DataBits          = Private->UartDevicePath.DataBits;
  Private->SerialIoMode.Parity            = Private->UartDevicePath.Parity;
  Private->SerialIoMode.StopBits          = Private->UartDevicePath.StopBits;

  //
  // Issue a reset to initialize the COM port
  //
  Status = Private->SerialIo.Reset (&Private->SerialIo);
  if (EFI_ERROR (Status)) {
    goto Error;
  }

  //
  // Create new child handle
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Private->Handle,
                  &gEfiSerialIoProtocolGuid,
                  &Private->SerialIo,
                  &gEfiDevicePathProtocolGuid,
                  Private->DevicePath,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    goto Error;
  }