/** @file Produces the SIO Protocols for ISA devices integrated in the Platform Controller Unit (PCU). Copyright (c) 2004 - 2019, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include "PcuSio.h" // // PCU SIO Driver Global Variables // EFI_DRIVER_BINDING_PROTOCOL gPcuSioDriverBinding = { PcuSioDriverBindingSupported, PcuSioDriverBindingStart, PcuSioDriverBindingStop, 0x10, NULL, NULL }; // // Super I/O Protocol interfaces // EFI_SIO_PROTOCOL mSioInterface = { SioRegisterAccess, SioGetResources, SioSetResources, SioPossibleResources, SioModify }; // // COM 1 UART Controller // GLOBAL_REMOVE_IF_UNREFERENCED SIO_RESOURCES_IO mCom1Resources = { { { ACPI_FIXED_LOCATION_IO_PORT_DESCRIPTOR }, 0x3F8, 8 }, { ACPI_END_TAG_DESCRIPTOR, 0 } }; // // Table of SIO Controllers // GLOBAL_REMOVE_IF_UNREFERENCED SIO_DEVICE_INFO mDevicesInfo[] = { { EISA_PNP_ID (0x501), 0, { (ACPI_SMALL_RESOURCE_HEADER *) &mCom1Resources } } }; // // ACPI Device Path Node template // GLOBAL_REMOVE_IF_UNREFERENCED ACPI_HID_DEVICE_PATH mAcpiDeviceNodeTemplate = { { // Header ACPI_DEVICE_PATH, ACPI_DP, { (UINT8) (sizeof (ACPI_HID_DEVICE_PATH)), (UINT8) ((sizeof (ACPI_HID_DEVICE_PATH)) >> 8) } }, 0x0, // HID 0x0 // UID }; /** Provides a low level access to the registers for the Super I/O. @param[in] This Indicates a pointer to the calling context. @param[in] Write Specifies the type of the register operation. If this parameter is TRUE, Value is interpreted as an input parameter and the operation is a register write. If this parameter is FALSE, Value is interpreted as an output parameter and the operation is a register read. @param[in] ExitCfgMode Exit Configuration Mode Indicator. If this parameter is set to TRUE, the Super I/O driver will turn off configuration mode of the Super I/O prior to returning from this function. If this parameter is set to FALSE, the Super I/O driver will leave Super I/O in the configuration mode. The Super I/O driver must track the current state of the Super I/O and enable the configuration mode of Super I/O if necessary prior to register access. @param[in] Register Register number. @param[in,out] Value If Write is TRUE, Value is a pointer to the buffer containing the byte of data to be written to the Super I/O register. If Write is FALSE, Value is a pointer to the destination buffer for the byte of data to be read from the Super I/O register. @retval EFI_SUCCESS The operation completed successfully. @retval EFI_INVALID_PARAMETER The Value is NULL. @retval EFI_INVALID_PARAMETER Invalid Register number. **/ EFI_STATUS EFIAPI SioRegisterAccess ( IN CONST EFI_SIO_PROTOCOL *This, IN BOOLEAN Write, IN BOOLEAN ExitCfgMode, IN UINT8 Register, IN OUT UINT8 *Value ) { return EFI_SUCCESS; } /** Provides an interface to get a list of the current resources consumed by the device in the ACPI Resource Descriptor format. GetResources() returns a list of resources currently consumed by the device. The ResourceList is a pointer to the buffer containing resource descriptors for the device. The descriptors are in the format of Small or Large ACPI resource descriptor as defined by ACPI specification (2.0 & 3.0). The buffer of resource descriptors is terminated with the 'End tag' resource descriptor. @param[in] This Indicates a pointer to the calling context. @param[out] ResourceList A pointer to an ACPI resource descriptor list that defines the current resources used by the device. @retval EFI_SUCCESS The operation completed successfully. @retval EFI_INVALID_PARAMETER ResourceList is NULL. **/ EFI_STATUS EFIAPI SioGetResources ( IN CONST EFI_SIO_PROTOCOL *This, OUT ACPI_RESOURCE_HEADER_PTR *ResourceList ) { SIO_DEV *SioDevice; if (ResourceList == NULL) { return EFI_INVALID_PARAMETER; } SioDevice = SIO_DEV_FROM_SIO (This); if (SioDevice->DeviceIndex < ARRAY_SIZE (mDevicesInfo)) { *ResourceList = mDevicesInfo[SioDevice->DeviceIndex].Resources; } return EFI_SUCCESS; } /** Sets the resources for the device. @param[in] This Indicates a pointer to the calling context. @param[in] ResourceList Pointer to the ACPI resource descriptor list. @retval EFI_SUCCESS The operation completed successfully. @retval EFI_INVALID_PARAMETER ResourceList is invalid. @retval EFI_ACCESS_DENIED Some of the resources in ResourceList are in use. **/ EFI_STATUS EFIAPI SioSetResources ( IN CONST EFI_SIO_PROTOCOL *This, IN ACPI_RESOURCE_HEADER_PTR ResourceList ) { return EFI_SUCCESS; } /** Provides a collection of resource descriptor lists. Each resource descriptor list in the collection defines a combination of resources that can potentially be used by the device. @param[in] This Indicates a pointer to the calling context. @param[out] ResourceCollection Collection of the resource descriptor lists. @retval EFI_SUCCESS The operation completed successfully. @retval EFI_INVALID_PARAMETER ResourceCollection is NULL. **/ EFI_STATUS EFIAPI SioPossibleResources ( IN CONST EFI_SIO_PROTOCOL *This, OUT ACPI_RESOURCE_HEADER_PTR *ResourceCollection ) { return EFI_SUCCESS; } /** Provides an interface for a table based programming of the Super I/O registers. The Modify() function provides an interface for table based programming of the Super I/O registers. This function can be used to perform programming of multiple Super I/O registers with a single function call. For each table entry, the Register is read, its content is bitwise ANDed with AndMask, and then ORed with OrMask before being written back to the Register. The Super I/O driver must track the current state of the Super I/O and enable the configuration mode of Super I/O if necessary prior to table processing. Once the table is processed, the Super I/O device has to be returned to the original state. @param[in] This Indicates a pointer to the calling context. @param[in] Command A pointer to an array of NumberOfCommands EFI_SIO_REGISTER_MODIFY structures. Each structure specifies a single Super I/O register modify operation. @param[in] NumberOfCommands Number of elements in the Command array. @retval EFI_SUCCESS The operation completed successfully. @retval EFI_INVALID_PARAMETER Command is NULL. **/ EFI_STATUS EFIAPI SioModify ( IN CONST EFI_SIO_PROTOCOL *This, IN CONST EFI_SIO_REGISTER_MODIFY *Command, IN UINTN NumberOfCommands ) { return EFI_SUCCESS; } /** Create the child device with a given device index. @param[in] This The EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] Controller The handle of ISA bus controller. @param[in] PciIo The pointer to the PCI protocol. @param[in] ParentDevicePath Device path of the ISA bus controller. @param[in] DeviceIndex Index of the device supported by this driver. @retval EFI_SUCCESS The child device has been created successfully. @retval Others Error occurred during the child device creation. **/ EFI_STATUS SioCreateChildDevice ( IN EFI_DRIVER_BINDING_PROTOCOL *This, IN EFI_HANDLE Controller, IN EFI_PCI_IO_PROTOCOL *PciIo, IN EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath, IN UINT32 DeviceIndex ) { EFI_STATUS Status; SIO_DEV *SioDevice; // // Initialize the SIO_DEV structure // SioDevice = AllocateZeroPool (sizeof (SIO_DEV)); if (SioDevice == NULL) { DEBUG ((DEBUG_ERROR, "SioCreateChildDevice(): Can not allocate SIO Device structure\n")); return EFI_OUT_OF_RESOURCES; } SioDevice->Signature = SIO_DEV_SIGNATURE; SioDevice->Handle = NULL; SioDevice->PciIo = PciIo; CopyMem (&SioDevice->Sio, &mSioInterface, sizeof (EFI_SIO_PROTOCOL)); SioDevice->DeviceIndex = DeviceIndex; // // Construct the child device path // mAcpiDeviceNodeTemplate.HID = mDevicesInfo[DeviceIndex].Hid; mAcpiDeviceNodeTemplate.UID = mDevicesInfo[DeviceIndex].Uid; SioDevice->DevicePath = AppendDevicePathNode ( ParentDevicePath, (EFI_DEVICE_PATH_PROTOCOL *) &mAcpiDeviceNodeTemplate ); if (SioDevice->DevicePath == NULL) { DEBUG ((DEBUG_ERROR, "SioCreateChildDevice(): Can not allocate SIO Device path\n")); Status = EFI_OUT_OF_RESOURCES; goto Done; } // // Create a child handle and install Device Path and Super I/O protocols // Status = gBS->InstallMultipleProtocolInterfaces ( &SioDevice->Handle, &gEfiDevicePathProtocolGuid, SioDevice->DevicePath, &gEfiSioProtocolGuid, &SioDevice->Sio, NULL ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "SioCreateChildDevice(): Can not install child protocols %r\n", Status)); goto Done; } Status = gBS->OpenProtocol ( Controller, &gEfiPciIoProtocolGuid, (VOID **) &PciIo, This->DriverBindingHandle, SioDevice->Handle, EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "SioCreateChildDevice(): Can not open parent PCI I/O Protocol by child controller %r\n", Status)); gBS->UninstallMultipleProtocolInterfaces ( SioDevice->Handle, &gEfiDevicePathProtocolGuid, SioDevice->DevicePath, &gEfiSioProtocolGuid, &SioDevice->Sio, NULL ); } Done: if (EFI_ERROR (Status)) { if (SioDevice->DevicePath != NULL) { FreePool (SioDevice->DevicePath); } FreePool (SioDevice); } return Status; } /** Create all the ISA child devices on the ISA bus controller (PCI to ISA bridge). @param[in] This The EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] Controller The handle of ISA bus controller. @param[in] PciIo The pointer to the PCI protocol. @param[in] ParentDevicePath Device path of the ISA bus controller. @retval The number of child device that is successfully created. **/ UINT32 SioCreateAllChildDevices ( IN EFI_DRIVER_BINDING_PROTOCOL *This, IN EFI_HANDLE Controller, IN EFI_PCI_IO_PROTOCOL *PciIo, IN EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath ) { UINT32 Index; UINT32 ChildDeviceNumber; EFI_STATUS Status; ChildDeviceNumber = 0; for (Index = 0; Index < ARRAY_SIZE (mDevicesInfo); Index++) { Status = SioCreateChildDevice ( This, Controller, PciIo, ParentDevicePath, Index ); if (!EFI_ERROR (Status)) { ChildDeviceNumber++; } } return ChildDeviceNumber; } /** Tests to see if this driver supports a given controller. If a child device is provided, it further tests to see if this driver supports creating a handle for the specified child device. This function checks to see if the driver specified by This supports the device specified by ControllerHandle. Drivers will typically use the device path attached to ControllerHandle and/or the services from the bus I/O abstraction attached to ControllerHandle to determine if the driver supports ControllerHandle. This function may be called many times during platform initialization. In order to reduce boot times, the tests performed by this function must be very small, and take as little time as possible to execute. This function must not change the state of any hardware devices, and this function must be aware that the device specified by ControllerHandle may already be managed by the same driver or a different driver. This function must match its calls to AllocatePages() with FreePages(), AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol(). Since ControllerHandle may have been previously started by the same driver, if a protocol is already in the opened state, then it must not be closed with CloseProtocol(). This is required to guarantee the state of ControllerHandle is not modified by this function. @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] ControllerHandle The handle of the controller to test. This handle must support a protocol interface that supplies an I/O abstraction to the driver. @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This parameter is ignored by device drivers, and is optional for bus drivers. For bus drivers, if this parameter is not NULL, then the bus driver must determine if the bus controller specified by ControllerHandle and the child controller specified by RemainingDevicePath are both supported by this bus driver. @retval EFI_SUCCESS The device specified by ControllerHandle and RemainingDevicePath is supported by the driver specified by This. @retval EFI_ALREADY_STARTED The device specified by ControllerHandle and RemainingDevicePath is already being managed by the driver specified by This. @retval EFI_ACCESS_DENIED The device specified by ControllerHandle and RemainingDevicePath is already being managed by a different driver or an application that requires exclusive access. @retval EFI_UNSUPPORTED The device specified by ControllerHandle and RemainingDevicePath is not supported by the driver specified by This. **/ EFI_STATUS EFIAPI PcuSioDriverBindingSupported ( 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; // // Get PciIo protocol instance // Status = gBS->OpenProtocol ( Controller, &gEfiPciIoProtocolGuid, (VOID **)&PciIo, This->DriverBindingHandle, Controller, EFI_OPEN_PROTOCOL_BY_DRIVER ); if (EFI_ERROR(Status)) { return Status; } Status = PciIo->Pci.Read ( PciIo, EfiPciIoWidthUint32, 0, sizeof(Pci) / sizeof(UINT32), &Pci ); if (!EFI_ERROR (Status)) { Status = EFI_UNSUPPORTED; if ((Pci.Hdr.Command & 0x03) == 0x03) { if (Pci.Hdr.ClassCode[2] == PCI_CLASS_BRIDGE) { // // See if this is a standard PCI to ISA Bridge from the Base Code // and Class Code // if (Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA) { Status = EFI_SUCCESS; } // // See if this is an Intel PCI to ISA bridge in Positive Decode Mode // if (Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA_PDECODE && Pci.Hdr.VendorId == 0x8086 && Pci.Hdr.DeviceId == 0x7110) { Status = EFI_SUCCESS; } } } } gBS->CloseProtocol ( Controller, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, Controller ); return Status; } /** Starts a device controller or a bus controller. The Start() function is designed to be invoked from the EFI boot service ConnectController(). As a result, much of the error checking on the parameters to Start() has been moved into this common boot service. It is legal to call Start() from other locations, but the following calling restrictions must be followed or the system behavior will not be deterministic. 1. ControllerHandle must be a valid EFI_HANDLE. 2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned EFI_DEVICE_PATH_PROTOCOL. 3. Prior to calling Start(), the Supported() function for the driver specified by This must have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS. @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] ControllerHandle The handle of the controller to start. This handle must support a protocol interface that supplies an I/O abstraction to the driver. @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This parameter is ignored by device drivers, and is optional for bus drivers. For a bus driver, if this parameter is NULL, then handles for all the children of Controller are created by this driver. If this parameter is not NULL and the first Device Path Node is not the End of Device Path Node, then only the handle for the child device specified by the first Device Path Node of RemainingDevicePath is created by this driver. If the first Device Path Node of RemainingDevicePath is the End of Device Path Node, no child handle is created by this driver. @retval EFI_SUCCESS The device was started. @retval EFI_DEVICE_ERROR The device could not be started due to a device error. @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources. @retval Others The driver failed to start the device. **/ EFI_STATUS EFIAPI PcuSioDriverBindingStart ( IN EFI_DRIVER_BINDING_PROTOCOL *This, IN EFI_HANDLE Controller, IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath ) { EFI_STATUS Status; EFI_PCI_IO_PROTOCOL *PciIo; EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath; UINT64 Supports; UINT64 OriginalAttributes; UINT64 Attributes; BOOLEAN Enabled; SIO_BUS_DRIVER_PRIVATE_DATA *Private; UINT32 ChildDeviceNumber; Enabled = FALSE; Supports = 0; OriginalAttributes = 0; Private = NULL; // // Open the PCI I/O Protocol Interface // PciIo = NULL; Status = gBS->OpenProtocol ( Controller, &gEfiPciIoProtocolGuid, (VOID**) &PciIo, This->DriverBindingHandle, Controller, EFI_OPEN_PROTOCOL_BY_DRIVER ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): No PCI I/O Protocol %r\n", Status)); return Status; } // // Open Device Path Protocol // Status = gBS->OpenProtocol ( Controller, &gEfiDevicePathProtocolGuid, (VOID **) &ParentDevicePath, This->DriverBindingHandle, Controller, EFI_OPEN_PROTOCOL_BY_DRIVER ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): No Device Path Protocol %r\n", Status)); gBS->CloseProtocol ( Controller, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, Controller ); return Status; } // // Get supported PCI attributes // Status = PciIo->Attributes ( PciIo, EfiPciIoAttributeOperationSupported, 0, &Supports ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): Error reading PCI I/O Supported Attributes %r\n", Status)); goto Done; } Supports &= (UINT64) (EFI_PCI_IO_ATTRIBUTE_ISA_IO | EFI_PCI_IO_ATTRIBUTE_ISA_IO_16); Status = PciIo->Attributes ( PciIo, EfiPciIoAttributeOperationGet, 0, &OriginalAttributes ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): Error reading PCI I/O Attributes %r\n", Status)); goto Done; } Attributes = EFI_PCI_DEVICE_ENABLE | Supports | EFI_PCI_IO_ATTRIBUTE_ISA_MOTHERBOARD_IO; Status = PciIo->Attributes ( PciIo, EfiPciIoAttributeOperationEnable, Attributes, NULL ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): Error enabling PCI I/O Attributes %r\n", Status)); goto Done; } Enabled = TRUE; // // Store the OriginalAttributes for the restore in BindingStop() // Private = AllocateZeroPool (sizeof (SIO_BUS_DRIVER_PRIVATE_DATA)); if (Private == NULL) { Status = EFI_OUT_OF_RESOURCES; DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): Error allocating SIO private data structure %r\n", Status)); goto Done; } Private->PciIo = PciIo; Private->OriginalAttributes = OriginalAttributes; Status = gBS->InstallProtocolInterface ( &Controller, &gEfiCallerIdGuid, EFI_NATIVE_INTERFACE, Private ); if (EFI_ERROR (Status)) { DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): Error installing gEfiCallerIdGuid %r\n", Status)); goto Done; } // // Report status code for the start of general controller initialization // REPORT_STATUS_CODE_WITH_DEVICE_PATH ( EFI_PROGRESS_CODE, (EFI_IO_BUS_LPC | EFI_IOB_PC_INIT), ParentDevicePath ); // // Report status code for the start of enabling devices on the bus // REPORT_STATUS_CODE_WITH_DEVICE_PATH ( EFI_PROGRESS_CODE, (EFI_IO_BUS_LPC | EFI_IOB_PC_ENABLE), ParentDevicePath ); // // Create all the children upon the first entrance // ChildDeviceNumber = SioCreateAllChildDevices ( This, Controller, PciIo, ParentDevicePath ); if (ChildDeviceNumber == 0) { Status = EFI_DEVICE_ERROR; DEBUG ((DEBUG_ERROR, "PcuSioDriverBindingStart(): Error creating child SIO devices %r\n", Status)); goto Done; } Done: if (EFI_ERROR (Status)) { if (PciIo != NULL && Enabled) { PciIo->Attributes ( PciIo, EfiPciIoAttributeOperationSet, OriginalAttributes, NULL ); } gBS->CloseProtocol ( Controller, &gEfiDevicePathProtocolGuid, This->DriverBindingHandle, Controller ); gBS->CloseProtocol ( Controller, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, Controller ); if (Private != NULL) { gBS->UninstallMultipleProtocolInterfaces ( Controller, &gEfiCallerIdGuid, Private, NULL ); FreePool (Private); } } return Status; } /** Stops a device controller or a bus controller. The Stop() function is designed to be invoked from the EFI boot service DisconnectController(). As a result, much of the error checking on the parameters to Stop() has been moved into this common boot service. It is legal to call Stop() from other locations, but the following calling restrictions must be followed or the system behavior will not be deterministic. 1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this same driver's Start() function. 2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid EFI_HANDLE. In addition, all of these handles must have been created in this driver's Start() function, and the Start() function must have called OpenProtocol() on ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER. @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] ControllerHandle A handle to the device being stopped. The handle must support a bus specific I/O protocol for the driver to use to stop the device. @param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer. @param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL if NumberOfChildren is 0. @retval EFI_SUCCESS The device was stopped. @retval EFI_DEVICE_ERROR The device could not be stopped due to a device error. **/ EFI_STATUS EFIAPI PcuSioDriverBindingStop ( IN EFI_DRIVER_BINDING_PROTOCOL *This, IN EFI_HANDLE Controller, IN UINTN NumberOfChildren, IN EFI_HANDLE *ChildHandleBuffer ) { EFI_STATUS Status; SIO_BUS_DRIVER_PRIVATE_DATA *Private; UINTN Index; BOOLEAN AllChildrenStopped; EFI_SIO_PROTOCOL *Sio; SIO_DEV *SioDevice; EFI_PCI_IO_PROTOCOL *PciIo; if (NumberOfChildren == 0) { // // Restore PCI attributes // Status = gBS->OpenProtocol ( Controller, &gEfiCallerIdGuid, (VOID **) &Private, This->DriverBindingHandle, Controller, EFI_OPEN_PROTOCOL_GET_PROTOCOL ); if (EFI_ERROR (Status)) { return Status; } Status = Private->PciIo->Attributes ( Private->PciIo, EfiPciIoAttributeOperationSet, Private->OriginalAttributes, NULL ); if (EFI_ERROR (Status)) { return Status; } gBS->UninstallProtocolInterface ( Controller, &gEfiCallerIdGuid, Private ); FreePool (Private); // // Close the bus driver // Status = gBS->CloseProtocol ( Controller, &gEfiDevicePathProtocolGuid, This->DriverBindingHandle, Controller ); if (EFI_ERROR (Status)) { return Status; } Status = gBS->CloseProtocol ( Controller, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, Controller ); if (EFI_ERROR (Status)) { return Status; } return EFI_SUCCESS; } // // Stop all the children // AllChildrenStopped = TRUE; for (Index = 0; Index < NumberOfChildren; Index++) { Status = gBS->OpenProtocol ( ChildHandleBuffer[Index], &gEfiSioProtocolGuid, (VOID **) &Sio, This->DriverBindingHandle, Controller, EFI_OPEN_PROTOCOL_GET_PROTOCOL ); if (!EFI_ERROR (Status)) { SioDevice = SIO_DEV_FROM_SIO (Sio); // // Close the child handle // Status = gBS->CloseProtocol ( Controller, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, ChildHandleBuffer[Index] ); Status = gBS->UninstallMultipleProtocolInterfaces ( ChildHandleBuffer[Index], &gEfiDevicePathProtocolGuid, SioDevice->DevicePath, &gEfiSioProtocolGuid, &SioDevice->Sio, NULL ); if (!EFI_ERROR (Status)) { FreePool (SioDevice->DevicePath); FreePool (SioDevice); } else { // // Re-open PCI IO Protocol on behalf of the child device // because of failure of destroying the child device handle // gBS->OpenProtocol ( Controller, &gEfiPciIoProtocolGuid, (VOID **) &PciIo, This->DriverBindingHandle, ChildHandleBuffer[Index], EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER ); } } if (EFI_ERROR (Status)) { AllChildrenStopped = FALSE; } } if (!AllChildrenStopped) { return EFI_DEVICE_ERROR; } return EFI_SUCCESS; } /** The entry point for the PCU SIO driver. @param[in] ImageHandle The firmware allocated handle for the EFI image. @param[in] SystemTable A pointer to the EFI System Table. @retval EFI_SUCCESS The entry point is executed successfully. @retval other Some error occurs when executing this entry point. **/ EFI_STATUS EFIAPI PcuSioDriverEntryPoint ( IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable ) { return EfiLibInstallDriverBinding ( ImageHandle, SystemTable, &gPcuSioDriverBinding, ImageHandle ); }