system76-edk2/IntelFrameworkModulePkg/Bus/Pci/VgaMiniPortDxe/VgaMiniPort.c

/** @file

Copyright (c) 2006 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.

**/

#include "VgaMiniPort.h"

//
// EFI Driver Binding Protocol Instance
//
//   This driver has a version value of 0x00000000.  This is the
//   lowest possible priority for a driver.  This is done on purpose to help
//   the developers of UGA drivers.  This driver can bind if no UGA driver
//   is present, so a console is available.  Then, when a UGA driver is loaded
//   this driver can be disconnected, and the UGA driver can be connected.
//   As long as the UGA driver has a version value greater than 0x00000000, it
//   will be connected first and will block this driver from connecting.
//
EFI_DRIVER_BINDING_PROTOCOL gPciVgaMiniPortDriverBinding = {
  PciVgaMiniPortDriverBindingSupported,
  PciVgaMiniPortDriverBindingStart,
  PciVgaMiniPortDriverBindingStop,
  0x00000000,
  NULL,
  NULL
};

//
// Driver Entry Point
//
EFI_STATUS
EFIAPI
PciVgaMiniPortDriverEntryPoint (
  IN EFI_HANDLE         ImageHandle,
  IN EFI_SYSTEM_TABLE   *SystemTable
  )
/*++

  Routine Description:
    Driver Entry Point.

  Arguments:
    (Standard EFI Image entry - EFI_IMAGE_ENTRY_POINT)

  Returns:
    EFI_STATUS
--*/
{
  return EfiLibInstallDriverBindingComponentName2 (
           ImageHandle,
           SystemTable,
           &gPciVgaMiniPortDriverBinding,
           ImageHandle,
           &gPciVgaMiniPortComponentName,
           &gPciVgaMiniPortComponentName2
           );
}


/**
  Supported.

  (Standard DriverBinding Protocol Supported() function)

  @return EFI_STATUS

**/
EFI_STATUS
EFIAPI
PciVgaMiniPortDriverBindingSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS          Status;
  EFI_PCI_IO_PROTOCOL *PciIo;
  PCI_TYPE00          Pci;

  //
  // Open the IO Abstraction(s) needed to perform the supported test
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }
  //
  // See if this is a PCI VGA Controller by looking at the Command register and
  // Class Code Register
  //
  Status = PciIo->Pci.Read (
                        PciIo,
                        EfiPciIoWidthUint32,
                        0,
                        sizeof (Pci) / sizeof (UINT32),
                        &Pci
                        );
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  Status = EFI_UNSUPPORTED;
  //
  // See if the device is an enabled VGA device.
  // Most systems can only have on VGA device on at a time.
  //
  if (((Pci.Hdr.Command & 0x03) == 0x03) && IS_PCI_VGA (&Pci)) {
    Status = EFI_SUCCESS;
  }

Done:
  gBS->CloseProtocol (
        Controller,
        &gEfiPciIoProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  return Status;
}


/**
  Install VGA Mini Port Protocol onto VGA device handles

  (Standard DriverBinding Protocol Start() function)

  @return EFI_STATUS

**/
EFI_STATUS
EFIAPI
PciVgaMiniPortDriverBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS            Status;
  EFI_PCI_IO_PROTOCOL   *PciIo;
  PCI_VGA_MINI_PORT_DEV *PciVgaMiniPortPrivate;

  PciVgaMiniPortPrivate = NULL;
  PciIo                 = NULL;
  //
  // Open the IO Abstraction(s) needed
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status)) {
    goto Done;
  }
  //
  // Allocate the private device structure
  //
  Status = gBS->AllocatePool (
                  EfiBootServicesData,
                  sizeof (PCI_VGA_MINI_PORT_DEV),
                  (VOID **) &PciVgaMiniPortPrivate
                  );
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  ZeroMem (PciVgaMiniPortPrivate, sizeof (PCI_VGA_MINI_PORT_DEV));

  //
  // Initialize the private device structure
  //
  PciVgaMiniPortPrivate->Signature = PCI_VGA_MINI_PORT_DEV_SIGNATURE;
  PciVgaMiniPortPrivate->Handle = Controller;
  PciVgaMiniPortPrivate->PciIo = PciIo;

  PciVgaMiniPortPrivate->VgaMiniPort.SetMode = PciVgaMiniPortSetMode;
  PciVgaMiniPortPrivate->VgaMiniPort.VgaMemoryOffset = 0xb8000;
  PciVgaMiniPortPrivate->VgaMiniPort.CrtcAddressRegisterOffset = 0x3d4;
  PciVgaMiniPortPrivate->VgaMiniPort.CrtcDataRegisterOffset = 0x3d5;
  PciVgaMiniPortPrivate->VgaMiniPort.VgaMemoryBar = EFI_PCI_IO_PASS_THROUGH_BAR;
  PciVgaMiniPortPrivate->VgaMiniPort.CrtcAddressRegisterBar = EFI_PCI_IO_PASS_THROUGH_BAR;
  PciVgaMiniPortPrivate->VgaMiniPort.CrtcDataRegisterBar = EFI_PCI_IO_PASS_THROUGH_BAR;
  PciVgaMiniPortPrivate->VgaMiniPort.MaxMode = 1;

  //
  // Install Vga Mini Port Protocol
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Controller,
                  &gEfiVgaMiniPortProtocolGuid,
                  &PciVgaMiniPortPrivate->VgaMiniPort,
                  NULL
                  );
Done:
  if (EFI_ERROR (Status)) {
    gBS->CloseProtocol (
          Controller,
          &gEfiPciIoProtocolGuid,
          This->DriverBindingHandle,
          Controller
          );
    if (PciVgaMiniPortPrivate) {
      gBS->FreePool (PciVgaMiniPortPrivate);
    }
  }

  return Status;
}


/**
  Stop.

  (Standard DriverBinding Protocol Stop() function)

  @return EFI_STATUS

**/
EFI_STATUS
EFIAPI
PciVgaMiniPortDriverBindingStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL     *This,
  IN  EFI_HANDLE                      Controller,
  IN  UINTN                           NumberOfChildren,
  IN  EFI_HANDLE                      *ChildHandleBuffer
  )
{
  EFI_STATUS                  Status;
  EFI_VGA_MINI_PORT_PROTOCOL  *VgaMiniPort;
  PCI_VGA_MINI_PORT_DEV       *PciVgaMiniPortPrivate;

  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiVgaMiniPortProtocolGuid,
                  (VOID **) &VgaMiniPort,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  PciVgaMiniPortPrivate = PCI_VGA_MINI_PORT_DEV_FROM_THIS (VgaMiniPort);

  Status = gBS->UninstallProtocolInterface (
                  Controller,
                  &gEfiVgaMiniPortProtocolGuid,
                  &PciVgaMiniPortPrivate->VgaMiniPort
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  gBS->CloseProtocol (
        Controller,
        &gEfiPciIoProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  gBS->FreePool (PciVgaMiniPortPrivate);

  return EFI_SUCCESS;
}
//
// VGA Mini Port Protocol Functions
//

/**
  GC_TODO: Add function description

  @param  This             GC_TODO: add argument description
  @param  ModeNumber       GC_TODO: add argument description

  @retval EFI_UNSUPPORTED  GC_TODO: Add description for return value
  @retval EFI_SUCCESS      GC_TODO: Add description for return value

**/
EFI_STATUS
EFIAPI
PciVgaMiniPortSetMode (
  IN  EFI_VGA_MINI_PORT_PROTOCOL  *This,
  IN  UINTN                       ModeNumber
  )
{
  if (ModeNumber > This->MaxMode) {
    return EFI_UNSUPPORTED;
  }

  return EFI_SUCCESS;
}