system76-edk2/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.h

/** @file
  Internal library declaration for PCI Bus module.

Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef _EFI_PCI_LIB_H_
#define _EFI_PCI_LIB_H_

typedef struct {
  EFI_HANDLE    Handle;
} EFI_DEVICE_HANDLE_EXTENDED_DATA_PAYLOAD;

typedef struct {
  UINT32    Bar;
  UINT16    DevicePathSize;
  UINT16    ReqResSize;
  UINT16    AllocResSize;
  UINT8     *DevicePath;
  UINT8     *ReqRes;
  UINT8     *AllocRes;
} EFI_RESOURCE_ALLOC_FAILURE_ERROR_DATA_PAYLOAD;

typedef enum {
  PciResizableBarMin = 0x00,
  PciResizableBarMax = 0xFF
} PCI_RESIZABLE_BAR_OPERATION;

/**
  Retrieve the PCI Card device BAR information via PciIo interface.

  @param PciIoDevice        PCI Card device instance.

**/
VOID
GetBackPcCardBar (
  IN  PCI_IO_DEVICE  *PciIoDevice
  );

/**
  Remove rejected pci device from specific root bridge
  handle.

  @param RootBridgeHandle  Specific parent root bridge handle.
  @param Bridge            Bridge device instance.

**/
VOID
RemoveRejectedPciDevices (
  IN EFI_HANDLE     RootBridgeHandle,
  IN PCI_IO_DEVICE  *Bridge
  );

/**
  Submits the I/O and memory resource requirements for the specified PCI Host Bridge.

  @param PciResAlloc  Point to protocol instance of EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL.

  @retval EFI_SUCCESS           Successfully finished resource allocation.
  @retval EFI_NOT_FOUND         Cannot get root bridge instance.
  @retval EFI_OUT_OF_RESOURCES  Platform failed to program the resources if no hot plug supported.
  @retval other                 Some error occurred when allocating resources for the PCI Host Bridge.

  @note   Feature flag PcdPciBusHotplugDeviceSupport determine whether need support hotplug.

**/
EFI_STATUS
PciHostBridgeResourceAllocator (
  IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL  *PciResAlloc
  );

/**
  Allocate NumberOfBuses buses and return the next available PCI bus number.

  @param  Bridge           Bridge device instance.
  @param  StartBusNumber   Current available PCI bus number.
  @param  NumberOfBuses    Number of buses enumerated below the StartBusNumber.
  @param  NextBusNumber    Next available PCI bus number.

  @retval EFI_SUCCESS           Available bus number resource is enough. Next available PCI bus number
                                is returned in NextBusNumber.
  @retval EFI_OUT_OF_RESOURCES  Available bus number resource is not enough for allocation.

**/
EFI_STATUS
PciAllocateBusNumber (
  IN PCI_IO_DEVICE  *Bridge,
  IN UINT8          StartBusNumber,
  IN UINT8          NumberOfBuses,
  OUT UINT8         *NextBusNumber
  );

/**
  Scan pci bus and assign bus number to the given PCI bus system.

  @param  Bridge           Bridge device instance.
  @param  StartBusNumber   start point.
  @param  SubBusNumber     Point to sub bus number.
  @param  PaddedBusRange   Customized bus number.

  @retval EFI_SUCCESS      Successfully scanned and assigned bus number.
  @retval other            Some error occurred when scanning pci bus.

  @note   Feature flag PcdPciBusHotplugDeviceSupport determine whether need support hotplug.

**/
EFI_STATUS
PciScanBus (
  IN PCI_IO_DEVICE  *Bridge,
  IN UINT8          StartBusNumber,
  OUT UINT8         *SubBusNumber,
  OUT UINT8         *PaddedBusRange
  );

/**
  Process Option Rom on the specified root bridge.

  @param Bridge  Pci root bridge device instance.

  @retval EFI_SUCCESS   Success process.
  @retval other         Some error occurred when processing Option Rom on the root bridge.

**/
EFI_STATUS
PciRootBridgeP2CProcess (
  IN PCI_IO_DEVICE  *Bridge
  );

/**
  Process Option Rom on the specified host bridge.

  @param PciResAlloc    Pointer to instance of EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL.

  @retval EFI_SUCCESS   Success process.
  @retval EFI_NOT_FOUND Can not find the root bridge instance.
  @retval other         Some error occurred when processing Option Rom on the host bridge.

**/
EFI_STATUS
PciHostBridgeP2CProcess (
  IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL  *PciResAlloc
  );

/**
  This function is used to enumerate the entire host bridge
  in a given platform.

  @param PciResAlloc   A pointer to the PCI Host Resource Allocation protocol.

  @retval EFI_SUCCESS            Successfully enumerated the host bridge.
  @retval EFI_OUT_OF_RESOURCES   No enough memory available.
  @retval other                  Some error occurred when enumerating the host bridge.

**/
EFI_STATUS
PciHostBridgeEnumerator (
  IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL  *PciResAlloc
  );

/**
  This function is used to program the Resizable BAR Register.

  @param PciIoDevice            A pointer to the PCI_IO_DEVICE.
  @param ResizableBarOp         PciResizableBarMax: Set BAR to max size
                                PciResizableBarMin: set BAR to min size.

  @retval EFI_SUCCESS           Successfully enumerated the host bridge.
  @retval other                 Some error occurred when enumerating the host bridge.

**/
EFI_STATUS
PciProgramResizableBar (
  IN PCI_IO_DEVICE                *PciIoDevice,
  IN PCI_RESIZABLE_BAR_OPERATION  ResizableBarOp
  );

#endif