isabus.c

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    );

  //
  // Create each ISA device handle in this ISA bus
  //
  IsaDevice = NULL;
  do {
    Status = IsaAcpi->DeviceEnumerate (IsaAcpi, &IsaDevice);
    if (EFI_ERROR (Status)) {
      break;
    }
    //
    // Get current resource of this ISA device
    //
    ResourceList  = NULL;
    Status        = IsaAcpi->GetCurResource (IsaAcpi, IsaDevice, &ResourceList);
    if (EFI_ERROR (Status)) {
      continue;
    }
    //
    // Create handle for this ISA device
    //
    Status = IsaCreateDevice (
               This,
               Controller,
               PciIo,
               ParentDevicePath,
               ResourceList,
               &AllocFailExtendedData.DevicePath
               );

    if (EFI_ERROR (Status)) {
      continue;
    }
    //
    // Initialize ISA device
    //
    IsaAcpi->InitDevice (IsaAcpi, IsaDevice);

    //
    // Set resources for this ISA device
    //
    Status = IsaAcpi->SetResource (IsaAcpi, IsaDevice, ResourceList);

    //
    // Report Status Code here when failed to resource conflicts
    //
    if (EFI_ERROR (Status) && (Status != EFI_UNSUPPORTED)) {
      //
      // It's hard to tell which resource conflicts
      //
      AllocFailExtendedData.Bar       = 0;
      AllocFailExtendedData.ReqRes    = NULL;
      AllocFailExtendedData.AllocRes  = NULL;
      EfiLibReportStatusCode (
        EFI_ERROR_CODE,
        (EFI_IO_BUS_LPC | EFI_IOB_EC_RESOURCE_CONFLICT),
        0,
        &gEfiCallerIdGuid,
        (EFI_STATUS_CODE_DATA *) &AllocFailExtendedData
        );
    }
    //
    // Set power for this ISA device
    //
    IsaAcpi->SetPower (IsaAcpi, IsaDevice, TRUE);

    //
    // Enable this ISA device
    //
    IsaAcpi->EnableDevice (IsaAcpi, IsaDevice, TRUE);

  } while (TRUE);

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
IsaBusControllerDriverStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL  * This,
  IN  EFI_HANDLE                   Controller,
  IN  UINTN                        NumberOfChildren,
  IN  EFI_HANDLE                   * ChildHandleBuffer OPTIONAL
  )
/*++

  Routine Description:
  
    This function tells the ISA Bus Driver to stop managing a PCI to ISA 
    Bridge controller. 
     
  Arguments:
  
    This                   - The EFI_DRIVER_BINDING_PROTOCOL instance.
    Controller             - A handle to the device being stopped.
    NumberOfChindren       - The number of child device handles in ChildHandleBuffer.
    ChildHandleBuffer      - An array of child handles to be freed.

  
  Returns:
  
    EFI_SUCCESS            - The device was stopped.
    EFI_DEVICE_ERROR       - The device could not be stopped due to a device error.
    EFI_NOT_STARTED        - The device has not been started.
    EFI_INVALID_PARAMETER  - One of the parameters has an invalid value.
    EFI_OUT_OF_RESOURCES   - The request could not be completed due to a lack of 
                             resources.

--*/
{
  EFI_STATUS                          Status;
  UINTN                               Index;
  BOOLEAN                             AllChildrenStopped;
  ISA_IO_DEVICE                       *IsaIoDevice;
  EFI_INTERFACE_DEFINITION_FOR_ISA_IO *IsaIo;

  if (NumberOfChildren == 0) {
    //
    // Close the bus driver
    //
    Status = gBS->CloseProtocol (
                    Controller,
                    &gEfiPciIoProtocolGuid,
                    This->DriverBindingHandle,
                    Controller
                    );
    if (EFI_ERROR (Status)) {
      return Status;
    }

    Status = gBS->CloseProtocol (
                    Controller,
                    &gEfiDevicePathProtocolGuid,
                    This->DriverBindingHandle,
                    Controller
                    );
    if (EFI_ERROR (Status)) {
      return Status;
    }

    Status = gBS->CloseProtocol (
                    Controller,
                    &gEfiIsaAcpiProtocolGuid,
                    This->DriverBindingHandle,
                    Controller
                    );
    if (EFI_ERROR (Status)) {
      return Status;
    }

    return EFI_SUCCESS;
  }
  //
  // Complete all outstanding transactions to Controller.
  // Don't allow any new transaction to Controller to be started.
  //
  //
  // Stop all the children
  // Find all the ISA devices that were discovered on this PCI to ISA Bridge
  // with the Start() function.
  //
  AllChildrenStopped = TRUE;

  for (Index = 0; Index < NumberOfChildren; Index++) {

    Status = gBS->OpenProtocol (
                    ChildHandleBuffer[Index],
                    EFI_ISA_IO_PROTOCOL_VERSION,
                    (VOID **) &IsaIo,
                    This->DriverBindingHandle,
                    Controller,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
    if (!EFI_ERROR (Status)) {

      IsaIoDevice = ISA_IO_DEVICE_FROM_ISA_IO_THIS (IsaIo);

      Status = gBS->UninstallMultipleProtocolInterfaces (
                      ChildHandleBuffer[Index],
                      &gEfiDevicePathProtocolGuid,
                      IsaIoDevice->DevicePath,
                      EFI_ISA_IO_PROTOCOL_VERSION,
                      &IsaIoDevice->IsaIo,
                      NULL
                      );

      if (!EFI_ERROR (Status)) {
        //
        // Close the child handle
        //
        Status = gBS->CloseProtocol (
                        Controller,
                        &gEfiPciIoProtocolGuid,
                        This->DriverBindingHandle,
                        ChildHandleBuffer[Index]
                        );

        gBS->FreePool (IsaIoDevice->DevicePath);
        gBS->FreePool (IsaIoDevice);
      }
    }

    if (EFI_ERROR (Status)) {
      AllChildrenStopped = FALSE;
    }
  }

  if (!AllChildrenStopped) {
    return EFI_DEVICE_ERROR;
  }
  //
  // Report Status Code here
  //
  EfiLibReportStatusCode (
    EFI_PROGRESS_CODE,
    (EFI_IO_BUS_LPC | EFI_IOB_PC_DISABLE),
    0,
    &gEfiCallerIdGuid,
    NULL
    );

  return EFI_SUCCESS;
}
//
// Internal Function
//
EFI_STATUS
IsaCreateDevice (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_PCI_IO_PROTOCOL          *PciIo,
  IN EFI_DEVICE_PATH_PROTOCOL     *ParentDevicePath,
  IN EFI_ISA_ACPI_RESOURCE_LIST   *IsaDeviceResourceList,
  OUT EFI_DEVICE_PATH_PROTOCOL    **ChildDevicePath
  )
/*++

  Routine Description:
  
    Create ISA device found by IsaPnpProtocol 

  Arguments:
  
    This                   - The EFI_DRIVER_BINDING_PROTOCOL instance.
    Controller             - The handle of ISA bus controller(PCI to ISA bridge)
    PciIo                  - The Pointer to the PCI protocol 
    ParentDevicePath       - Device path of the ISA bus controller
    IsaDeviceResourceList  - The resource list of the ISA device
    ChildDevicePath        - The pointer to the child device.

  Returns:
  
    EFI_SUCCESS            - Create the child device.
    EFI_OUT_OF_RESOURCES   - The request could not be completed due to a lack of 
                             resources.
    EFI_DEVICE_ERROR       - Can not create child device.
    
--*/
{
  EFI_STATUS    Status;
  ISA_IO_DEVICE *IsaIoDevice;
  EFI_DEV_PATH  Node;

  //
  // Initialize the PCI_IO_DEVICE structure
  //
  IsaIoDevice = EfiLibAllocateZeroPool (sizeof (ISA_IO_DEVICE));
  if (IsaIoDevice == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  IsaIoDevice->Signature  = ISA_IO_DEVICE_SIGNATURE;
  IsaIoDevice->Handle     = NULL;
  IsaIoDevice->PciIo      = PciIo;

  //
  // Initialize the ISA I/O instance structure
  //
  Status = InitializeIsaIoInstance (IsaIoDevice, IsaDeviceResourceList);
  if (EFI_ERROR (Status)) {
    gBS->FreePool (IsaIoDevice);
    return Status;
  }
  //
  // Build the child device path
  //
  Node.DevPath.Type     = ACPI_DEVICE_PATH;
  Node.DevPath.SubType  = ACPI_DP;
  SetDevicePathNodeLength (&Node.DevPath, sizeof (ACPI_HID_DEVICE_PATH));
  Node.Acpi.HID = IsaDeviceResourceList->Device.HID;
  Node.Acpi.UID = IsaDeviceResourceList->Device.UID;

  IsaIoDevice->DevicePath = EfiAppendDevicePathNode (
                              ParentDevicePath,
                              &Node.DevPath
                              );

  if (IsaIoDevice->DevicePath == NULL) {
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  *ChildDevicePath = IsaIoDevice->DevicePath;

  //
  // Create a child handle and attach the DevicePath,
  // PCI I/O, and Controller State
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &IsaIoDevice->Handle,
                  &gEfiDevicePathProtocolGuid,
                  IsaIoDevice->DevicePath,
                  EFI_ISA_IO_PROTOCOL_VERSION,
                  &IsaIoDevice->IsaIo,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  IsaIoDevice->Handle,
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                  );
  if (EFI_ERROR (Status)) {
    gBS->UninstallMultipleProtocolInterfaces (
           IsaIoDevice->Handle,
           &gEfiDevicePathProtocolGuid,
           IsaIoDevice->DevicePath,
           EFI_ISA_IO_PROTOCOL_VERSION,
           &IsaIoDevice->IsaIo,
           NULL
           );
  }

Done:

  if (EFI_ERROR (Status)) {
    if (IsaIoDevice->DevicePath != NULL) {
      gBS->FreePool (IsaIoDevice->DevicePath);
    }

    gBS->FreePool (IsaIoDevice);
  }

  return Status;
}