[mirror_edk2.git] / IntelFrameworkModulePkg / Bus / Isa / IsaIoDxe / IsaDriver.c

/** @file\r
  IsaIo UEFI driver.\r
\r
  Produce an instance of the ISA I/O Protocol for every SIO controller.\r
\r
Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "IsaDriver.h"\r
\r
//\r
// IsaIo Driver Global Variables\r
//\r
EFI_DRIVER_BINDING_PROTOCOL gIsaIoDriver = {\r
  IsaIoDriverSupported,\r
  IsaIoDriverStart,\r
  IsaIoDriverStop,\r
  0xa,\r
  NULL,\r
  NULL\r
};\r
\r
/**\r
  The main entry point for the IsaIo driver.\r
\r
  @param[in] ImageHandle        The firmware allocated handle for the EFI image.\r
  @param[in] SystemTable        A pointer to the EFI System Table.\r
\r
  @retval EFI_SUCCESS           The entry point is executed successfully.\r
  @retval EFI_OUT_OF_RESOURCES  There was not enough memory in pool to install all the protocols.\r
**/\r
EFI_STATUS\r
EFIAPI\r
InitializeIsaIo (\r
  IN EFI_HANDLE           ImageHandle,\r
  IN EFI_SYSTEM_TABLE     *SystemTable\r
  )\r
{\r
  EFI_STATUS              Status;\r
\r
  //\r
  // Install driver model protocol(s).\r
  //\r
  Status = EfiLibInstallDriverBindingComponentName2 (\r
             ImageHandle,\r
             SystemTable,\r
             &gIsaIoDriver,\r
             ImageHandle,\r
             &gIsaIoComponentName,\r
             &gIsaIoComponentName2\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return Status;\r
}\r
\r
/**\r
  Tests to see if a controller can be managed by the IsaIo driver.\r
\r
  @param[in] This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
  @param[in] Controller           The handle of the controller to test.\r
  @param[in] RemainingDevicePath  A pointer to the remaining portion of a device path.\r
\r
  @retval EFI_SUCCESS             The device is supported by this driver.\r
  @retval EFI_ALREADY_STARTED     The device is already being managed by this driver.\r
  @retval EFI_ACCESS_DENIED       The device is already being managed by a different driver\r
                                  or an application that requires exclusive access.\r
  @retval EFI_UNSUPPORTED         The device is is not supported by this driver.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
IsaIoDriverSupported (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL\r
  )\r
{\r
  EFI_STATUS                Status;\r
  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;\r
  EFI_SIO_PROTOCOL          *Sio;\r
  EFI_HANDLE                PciHandle;\r
\r
  //\r
  // Try to open EFI DEVICE PATH protocol on the controller\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiDevicePathProtocolGuid,\r
                  (VOID **) &DevicePath,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );\r
\r
  if (!EFI_ERROR (Status)) {\r
    //\r
    // Get the PciIo protocol from its parent controller.\r
    //\r
    Status = gBS->LocateDevicePath (&gEfiPciIoProtocolGuid, &DevicePath, &PciHandle);\r
  }\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Try to open the Super IO protocol on the controller\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiSioProtocolGuid,\r
                  (VOID **) &Sio,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER\r
                  );\r
  if (!EFI_ERROR (Status)) {\r
    gBS->CloseProtocol (\r
           Controller,\r
           &gEfiSioProtocolGuid,\r
           This->DriverBindingHandle,\r
           Controller\r
           );\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Start this driver on ControllerHandle.\r
\r
  The Start() function is designed to be invoked from the EFI boot service ConnectController().\r
  As a result, much of the error checking on the parameters to Start() has been moved into this\r
  common boot service. It is legal to call Start() from other locations, but the following calling\r
  restrictions must be followed or the system behavior will not be deterministic.\r
  1. ControllerHandle must be a valid EFI_HANDLE.\r
  2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned\r
     EFI_DEVICE_PATH_PROTOCOL.\r
  3. Prior to calling Start(), the Supported() function for the driver specified by This must\r
     have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.\r
\r
  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
  @param[in]  ControllerHandle     The handle of the controller to start. This handle\r
                                   must support a protocol interface that supplies\r
                                   an I/O abstraction to the driver.\r
  @param[in]  RemainingDevicePath  A pointer to the remaining portion of a device path.\r
                                   This parameter is ignored by device drivers, and is optional for bus drivers.\r
\r
  @retval EFI_SUCCESS              The device was started.\r
  @retval EFI_DEVICE_ERROR         The device could not be started due to a device error.\r
                                   Currently not implemented.\r
  @retval EFI_OUT_OF_RESOURCES     The request could not be completed due to a lack of resources.\r
  @retval Others                   The driver failded to start the device.\r
**/\r
EFI_STATUS\r
EFIAPI\r
IsaIoDriverStart (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL\r
  )\r
{\r
  EFI_STATUS                            Status;\r
  EFI_PCI_IO_PROTOCOL                   *PciIo;\r
  EFI_DEVICE_PATH_PROTOCOL              *DevicePath;\r
  EFI_HANDLE                            PciHandle;\r
  EFI_SIO_PROTOCOL                      *Sio;\r
  ACPI_RESOURCE_HEADER_PTR              Resources;\r
  EFI_DEVICE_PATH_PROTOCOL              *TempDevicePath;\r
  ISA_IO_DEVICE                         *IsaIoDevice;\r
\r
  PciIo = NULL;\r
  Sio   = NULL;\r
\r
  //\r
  // Open Device Path Protocol\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiDevicePathProtocolGuid,\r
                  (VOID **) &DevicePath,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Get the PciIo protocol from its parent controller.\r
  //\r
  TempDevicePath = DevicePath;\r
  Status = gBS->LocateDevicePath (&gEfiPciIoProtocolGuid, &TempDevicePath, &PciHandle);\r
  if (!EFI_ERROR (Status)) {\r
    Status = gBS->HandleProtocol (PciHandle, &gEfiPciIoProtocolGuid, (VOID **) &PciIo);\r
    ASSERT_EFI_ERROR (Status);\r
\r
    //\r
    // Open Super IO Protocol\r
    //\r
    Status = gBS->OpenProtocol (\r
                    Controller,\r
                    &gEfiSioProtocolGuid,\r
                    (VOID **) &Sio,\r
                    This->DriverBindingHandle,\r
                    Controller,\r
                    EFI_OPEN_PROTOCOL_BY_DRIVER\r
                    );\r
  }\r
\r
  if (EFI_ERROR (Status)) {\r
    //\r
    // Fail due to LocateDevicePath(...) or OpenProtocol(Sio, BY_DRIVER)\r
    //\r
    return Status;\r
  }\r
\r
  Status = Sio->GetResources (Sio, &Resources);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  IsaIoDevice = AllocatePool (sizeof (ISA_IO_DEVICE));\r
  ASSERT (IsaIoDevice != NULL);\r
\r
  IsaIoDevice->Signature = ISA_IO_DEVICE_SIGNATURE;\r
  IsaIoDevice->PciIo     = PciIo;\r
\r
  //\r
  // Initialize the ISA I/O instance structure\r
  //\r
  InitializeIsaIoInstance (IsaIoDevice, DevicePath, Resources);\r
\r
  //\r
  // Install the ISA I/O protocol on the Controller handle\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &Controller,\r
                  &gEfiIsaIoProtocolGuid,\r
                  &IsaIoDevice->IsaIo,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Stop this driver on ControllerHandle.\r
\r
  The Stop() function is designed to be invoked from the EFI boot service DisconnectController().\r
  As a result, much of the error checking on the parameters to Stop() has been moved\r
  into this common boot service. It is legal to call Stop() from other locations,\r
  but the following calling restrictions must be followed or the system behavior will not be deterministic.\r
  1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this\r
     same driver's Start() function.\r
  2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid\r
     EFI_HANDLE. In addition, all of these handles must have been created in this driver's\r
     Start() function, and the Start() function must have called OpenProtocol() on\r
     ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.\r
\r
  @param[in]  This              A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
  @param[in]  ControllerHandle  A handle to the device being stopped. The handle must\r
                                support a bus specific I/O protocol for the driver\r
                                to use to stop the device.\r
  @param[in]  NumberOfChildren  The number of child device handles in ChildHandleBuffer.\r
  @param[in]  ChildHandleBuffer An array of child handles to be freed. May be NULL\r
                                if NumberOfChildren is 0.\r
\r
  @retval EFI_SUCCESS           The device was stopped.\r
  @retval EFI_DEVICE_ERROR      The device could not be stopped due to a device error.\r
**/\r
EFI_STATUS\r
EFIAPI\r
IsaIoDriverStop (\r
  IN  EFI_DRIVER_BINDING_PROTOCOL  * This,\r
  IN  EFI_HANDLE                   Controller,\r
  IN  UINTN                        NumberOfChildren,\r
  IN  EFI_HANDLE                   * ChildHandleBuffer OPTIONAL\r
  )\r
{\r
  EFI_STATUS                          Status;\r
  ISA_IO_DEVICE                       *IsaIoDevice;\r
  EFI_ISA_IO_PROTOCOL                 *IsaIo;\r
\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiIsaIoProtocolGuid,\r
                  (VOID **) &IsaIo,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  IsaIoDevice = ISA_IO_DEVICE_FROM_ISA_IO_THIS (IsaIo);\r
\r
  Status = gBS->UninstallMultipleProtocolInterfaces (\r
                  Controller,\r
                  &gEfiIsaIoProtocolGuid,\r
                  &IsaIoDevice->IsaIo,\r
                  NULL\r
                  );\r
  if (!EFI_ERROR (Status)) {\r
    Status = gBS->CloseProtocol (\r
                    Controller,\r
                    &gEfiSioProtocolGuid,\r
                    This->DriverBindingHandle,\r
                    Controller\r
                    );\r
    FreePool (IsaIoDevice->IsaIo.ResourceList);\r
    FreePool (IsaIoDevice);\r
  }\r
\r
   return Status;\r
}\r
Commit	Line	Data
558be455 RN	1	/** @file\r
	2	IsaIo UEFI driver.\r
	3	\r
	4	Produce an instance of the ISA I/O Protocol for every SIO controller.\r
0a6f4824 LG	5	\r
0a6f4824 LG	6	Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>\r
c0a00b14	7	SPDX-License-Identifier: BSD-2-Clause-Patent\r
558be455 RN	8	\r
	9	**/\r
	10	\r
	11	#include "IsaDriver.h"\r
	12	\r
	13	//\r
	14	// IsaIo Driver Global Variables\r
	15	//\r
	16	EFI_DRIVER_BINDING_PROTOCOL gIsaIoDriver = {\r
	17	IsaIoDriverSupported,\r
	18	IsaIoDriverStart,\r
	19	IsaIoDriverStop,\r
	20	0xa,\r
	21	NULL,\r
	22	NULL\r
	23	};\r
	24	\r
	25	/**\r
	26	The main entry point for the IsaIo driver.\r
	27	\r
0a6f4824	28	@param[in] ImageHandle The firmware allocated handle for the EFI image.\r
558be455	29	@param[in] SystemTable A pointer to the EFI System Table.\r
0a6f4824	30	\r
558be455 RN	31	@retval EFI_SUCCESS The entry point is executed successfully.\r
	32	@retval EFI_OUT_OF_RESOURCES There was not enough memory in pool to install all the protocols.\r
	33	**/\r
	34	EFI_STATUS\r
	35	EFIAPI\r
	36	InitializeIsaIo (\r
	37	IN EFI_HANDLE ImageHandle,\r
	38	IN EFI_SYSTEM_TABLE *SystemTable\r
	39	)\r
	40	{\r
	41	EFI_STATUS Status;\r
	42	\r
	43	//\r
	44	// Install driver model protocol(s).\r
	45	//\r
	46	Status = EfiLibInstallDriverBindingComponentName2 (\r
	47	ImageHandle,\r
	48	SystemTable,\r
	49	&gIsaIoDriver,\r
	50	ImageHandle,\r
	51	&gIsaIoComponentName,\r
	52	&gIsaIoComponentName2\r
	53	);\r
	54	ASSERT_EFI_ERROR (Status);\r
	55	\r
	56	return Status;\r
	57	}\r
	58	\r
0a6f4824	59	/**\r
558be455 RN	60	Tests to see if a controller can be managed by the IsaIo driver.\r
558be455 RN	61	\r
0a6f4824	62	@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
558be455 RN	63	@param[in] Controller The handle of the controller to test.\r
558be455 RN	64	@param[in] RemainingDevicePath A pointer to the remaining portion of a device path.\r
0a6f4824	65	\r
558be455 RN	66	@retval EFI_SUCCESS The device is supported by this driver.\r
558be455 RN	67	@retval EFI_ALREADY_STARTED The device is already being managed by this driver.\r
0a6f4824	68	@retval EFI_ACCESS_DENIED The device is already being managed by a different driver\r
558be455 RN	69	or an application that requires exclusive access.\r
	70	@retval EFI_UNSUPPORTED The device is is not supported by this driver.\r
	71	\r
	72	**/\r
	73	EFI_STATUS\r
	74	EFIAPI\r
	75	IsaIoDriverSupported (\r
	76	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	77	IN EFI_HANDLE Controller,\r
	78	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL\r
	79	)\r
	80	{\r
	81	EFI_STATUS Status;\r
	82	EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
	83	EFI_SIO_PROTOCOL *Sio;\r
	84	EFI_HANDLE PciHandle;\r
	85	\r
	86	//\r
	87	// Try to open EFI DEVICE PATH protocol on the controller\r
	88	//\r
	89	Status = gBS->OpenProtocol (\r
	90	Controller,\r
	91	&gEfiDevicePathProtocolGuid,\r
	92	(VOID **) &DevicePath,\r
	93	This->DriverBindingHandle,\r
	94	Controller,\r
	95	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	96	);\r
	97	\r
	98	if (!EFI_ERROR (Status)) {\r
	99	//\r
	100	// Get the PciIo protocol from its parent controller.\r
	101	//\r
	102	Status = gBS->LocateDevicePath (&gEfiPciIoProtocolGuid, &DevicePath, &PciHandle);\r
558be455 RN	103	}\r
	104	\r
	105	if (EFI_ERROR (Status)) {\r
	106	return Status;\r
	107	}\r
	108	\r
	109	//\r
	110	// Try to open the Super IO protocol on the controller\r
	111	//\r
	112	Status = gBS->OpenProtocol (\r
	113	Controller,\r
	114	&gEfiSioProtocolGuid,\r
	115	(VOID **) &Sio,\r
	116	This->DriverBindingHandle,\r
	117	Controller,\r
	118	EFI_OPEN_PROTOCOL_BY_DRIVER\r
	119	);\r
	120	if (!EFI_ERROR (Status)) {\r
	121	gBS->CloseProtocol (\r
	122	Controller,\r
	123	&gEfiSioProtocolGuid,\r
	124	This->DriverBindingHandle,\r
	125	Controller\r
	126	);\r
	127	}\r
	128	\r
	129	return Status;\r
	130	}\r
	131	\r
	132	/**\r
0a6f4824 LG	133	Start this driver on ControllerHandle.\r
	134	\r
	135	The Start() function is designed to be invoked from the EFI boot service ConnectController().\r
	136	As a result, much of the error checking on the parameters to Start() has been moved into this\r
	137	common boot service. It is legal to call Start() from other locations, but the following calling\r
558be455 RN	138	restrictions must be followed or the system behavior will not be deterministic.\r
	139	1. ControllerHandle must be a valid EFI_HANDLE.\r
	140	2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned\r
	141	EFI_DEVICE_PATH_PROTOCOL.\r
	142	3. Prior to calling Start(), the Supported() function for the driver specified by This must\r
0a6f4824	143	have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.\r
558be455 RN	144	\r
558be455 RN	145	@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
0a6f4824 LG	146	@param[in] ControllerHandle The handle of the controller to start. This handle\r
0a6f4824 LG	147	must support a protocol interface that supplies\r
558be455	148	an I/O abstraction to the driver.\r
0a6f4824	149	@param[in] RemainingDevicePath A pointer to the remaining portion of a device path.\r
558be455 RN	150	This parameter is ignored by device drivers, and is optional for bus drivers.\r
	151	\r
	152	@retval EFI_SUCCESS The device was started.\r
	153	@retval EFI_DEVICE_ERROR The device could not be started due to a device error.\r
	154	Currently not implemented.\r
	155	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.\r
	156	@retval Others The driver failded to start the device.\r
	157	**/\r
	158	EFI_STATUS\r
	159	EFIAPI\r
	160	IsaIoDriverStart (\r
	161	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	162	IN EFI_HANDLE Controller,\r
	163	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL\r
	164	)\r
	165	{\r
	166	EFI_STATUS Status;\r
	167	EFI_PCI_IO_PROTOCOL *PciIo;\r
	168	EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
	169	EFI_HANDLE PciHandle;\r
	170	EFI_SIO_PROTOCOL *Sio;\r
	171	ACPI_RESOURCE_HEADER_PTR Resources;\r
12b7f509	172	EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;\r
558be455 RN	173	ISA_IO_DEVICE *IsaIoDevice;\r
	174	\r
	175	PciIo = NULL;\r
	176	Sio = NULL;\r
	177	\r
	178	//\r
	179	// Open Device Path Protocol\r
	180	//\r
	181	Status = gBS->OpenProtocol (\r
	182	Controller,\r
	183	&gEfiDevicePathProtocolGuid,\r
	184	(VOID **) &DevicePath,\r
	185	This->DriverBindingHandle,\r
	186	Controller,\r
	187	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	188	);\r
	189	if (EFI_ERROR (Status)) {\r
	190	return Status;\r
	191	}\r
	192	\r
	193	//\r
	194	// Get the PciIo protocol from its parent controller.\r
	195	//\r
12b7f509 RN	196	TempDevicePath = DevicePath;\r
12b7f509 RN	197	Status = gBS->LocateDevicePath (&gEfiPciIoProtocolGuid, &TempDevicePath, &PciHandle);\r
558be455	198	if (!EFI_ERROR (Status)) {\r
f6aa9c1b	199	Status = gBS->HandleProtocol (PciHandle, &gEfiPciIoProtocolGuid, (VOID **) &PciIo);\r
558be455 RN	200	ASSERT_EFI_ERROR (Status);\r
	201	\r
	202	//\r
	203	// Open Super IO Protocol\r
	204	//\r
	205	Status = gBS->OpenProtocol (\r
	206	Controller,\r
	207	&gEfiSioProtocolGuid,\r
	208	(VOID **) &Sio,\r
	209	This->DriverBindingHandle,\r
	210	Controller,\r
	211	EFI_OPEN_PROTOCOL_BY_DRIVER\r
	212	);\r
	213	}\r
	214	\r
	215	if (EFI_ERROR (Status)) {\r
	216	//\r
	217	// Fail due to LocateDevicePath(...) or OpenProtocol(Sio, BY_DRIVER)\r
	218	//\r
	219	return Status;\r
	220	}\r
	221	\r
	222	Status = Sio->GetResources (Sio, &Resources);\r
	223	ASSERT_EFI_ERROR (Status);\r
	224	\r
	225	IsaIoDevice = AllocatePool (sizeof (ISA_IO_DEVICE));\r
	226	ASSERT (IsaIoDevice != NULL);\r
	227	\r
	228	IsaIoDevice->Signature = ISA_IO_DEVICE_SIGNATURE;\r
	229	IsaIoDevice->PciIo = PciIo;\r
	230	\r
	231	//\r
	232	// Initialize the ISA I/O instance structure\r
	233	//\r
	234	InitializeIsaIoInstance (IsaIoDevice, DevicePath, Resources);\r
	235	\r
	236	//\r
	237	// Install the ISA I/O protocol on the Controller handle\r
	238	//\r
	239	Status = gBS->InstallMultipleProtocolInterfaces (\r
	240	&Controller,\r
	241	&gEfiIsaIoProtocolGuid,\r
	242	&IsaIoDevice->IsaIo,\r
	243	NULL\r
	244	);\r
	245	ASSERT_EFI_ERROR (Status);\r
	246	\r
	247	return EFI_SUCCESS;\r
	248	}\r
	249	\r
	250	/**\r
0a6f4824 LG	251	Stop this driver on ControllerHandle.\r
	252	\r
	253	The Stop() function is designed to be invoked from the EFI boot service DisconnectController().\r
	254	As a result, much of the error checking on the parameters to Stop() has been moved\r
	255	into this common boot service. It is legal to call Stop() from other locations,\r
558be455 RN	256	but the following calling restrictions must be followed or the system behavior will not be deterministic.\r
	257	1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this\r
	258	same driver's Start() function.\r
	259	2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid\r
	260	EFI_HANDLE. In addition, all of these handles must have been created in this driver's\r
	261	Start() function, and the Start() function must have called OpenProtocol() on\r
	262	ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.\r
0a6f4824	263	\r
558be455	264	@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
0a6f4824 LG	265	@param[in] ControllerHandle A handle to the device being stopped. The handle must\r
0a6f4824 LG	266	support a bus specific I/O protocol for the driver\r
558be455 RN	267	to use to stop the device.\r
558be455 RN	268	@param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.\r
0a6f4824	269	@param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL\r
558be455 RN	270	if NumberOfChildren is 0.\r
	271	\r
	272	@retval EFI_SUCCESS The device was stopped.\r
	273	@retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.\r
	274	**/\r
	275	EFI_STATUS\r
	276	EFIAPI\r
	277	IsaIoDriverStop (\r
	278	IN EFI_DRIVER_BINDING_PROTOCOL * This,\r
	279	IN EFI_HANDLE Controller,\r
	280	IN UINTN NumberOfChildren,\r
	281	IN EFI_HANDLE * ChildHandleBuffer OPTIONAL\r
	282	)\r
	283	{\r
	284	EFI_STATUS Status;\r
	285	ISA_IO_DEVICE *IsaIoDevice;\r
	286	EFI_ISA_IO_PROTOCOL *IsaIo;\r
	287	\r
	288	Status = gBS->OpenProtocol (\r
	289	Controller,\r
	290	&gEfiIsaIoProtocolGuid,\r
	291	(VOID **) &IsaIo,\r
	292	This->DriverBindingHandle,\r
	293	Controller,\r
	294	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	295	);\r
	296	if (EFI_ERROR (Status)) {\r
	297	return EFI_UNSUPPORTED;\r
	298	}\r
	299	\r
	300	IsaIoDevice = ISA_IO_DEVICE_FROM_ISA_IO_THIS (IsaIo);\r
	301	\r
	302	Status = gBS->UninstallMultipleProtocolInterfaces (\r
	303	Controller,\r
	304	&gEfiIsaIoProtocolGuid,\r
	305	&IsaIoDevice->IsaIo,\r
	306	NULL\r
	307	);\r
	308	if (!EFI_ERROR (Status)) {\r
	309	Status = gBS->CloseProtocol (\r
	310	Controller,\r
	311	&gEfiSioProtocolGuid,\r
	312	This->DriverBindingHandle,\r
	313	Controller\r
	314	);\r
	315	FreePool (IsaIoDevice->IsaIo.ResourceList);\r
	316	FreePool (IsaIoDevice);\r
	317	}\r
	318	\r
	319	return Status;\r
f6aa9c1b	320	}\r