[mirror_edk2.git] / MdeModulePkg / Bus / Pci / PciBusDxe / PciBus.c

/** @file\r
  Driver Binding functions for PCI Bus module.\r
\r
  Single PCI bus driver instance will manager all PCI Root Bridges in one EFI based firmware,\r
  since all PCI Root Bridges' resources need to be managed together.\r
  Supported() function will try to get PCI Root Bridge IO Protocol.\r
  Start() function will get PCI Host Bridge Resource Allocation Protocol to manage all\r
  PCI Root Bridges. So it means platform needs install PCI Root Bridge IO protocol for each\r
  PCI Root Bus and install PCI Host Bridge Resource Allocation Protocol.\r
\r
Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "PciBus.h"\r
\r
//\r
// PCI Bus Driver Global Variables\r
//\r
EFI_DRIVER_BINDING_PROTOCOL                   gPciBusDriverBinding = {\r
  PciBusDriverBindingSupported,\r
  PciBusDriverBindingStart,\r
  PciBusDriverBindingStop,\r
  0xa,\r
  NULL,\r
  NULL\r
};\r
\r
EFI_HANDLE                                    gPciHostBrigeHandles[PCI_MAX_HOST_BRIDGE_NUM];\r
EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL  *gEfiIncompatiblePciDeviceSupport = NULL;\r
UINTN                                         gPciHostBridgeNumber = 0;\r
BOOLEAN                                       gFullEnumeration     = TRUE;\r
UINT64                                        gAllOne              = 0xFFFFFFFFFFFFFFFFULL;\r
UINT64                                        gAllZero             = 0;\r
\r
EFI_PCI_PLATFORM_PROTOCOL                     *gPciPlatformProtocol;\r
EFI_PCI_OVERRIDE_PROTOCOL                     *gPciOverrideProtocol;\r
\r
\r
GLOBAL_REMOVE_IF_UNREFERENCED EFI_PCI_HOTPLUG_REQUEST_PROTOCOL mPciHotPlugRequest = {\r
  PciHotPlugRequestNotify\r
};\r
\r
/**\r
  The Entry Point for PCI Bus module. The user code starts with this function.\r
\r
  Installs driver module protocols and. Creates virtual device handles for ConIn,\r
  ConOut, and StdErr. Installs Simple Text In protocol, Simple Text In Ex protocol,\r
  Simple Pointer protocol, Absolute Pointer protocol on those virtual handlers.\r
  Installs Graphics Output protocol and/or UGA Draw protocol if needed.\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 other             Some error occurred when executing this entry point.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusEntryPoint (\r
  IN EFI_HANDLE         ImageHandle,\r
  IN EFI_SYSTEM_TABLE   *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
  EFI_HANDLE  Handle;\r
\r
  //\r
  // Initializes PCI devices pool\r
  //\r
  InitializePciDevicePool ();\r
\r
  //\r
  // Install driver model protocol(s).\r
  //\r
  Status = EfiLibInstallDriverBindingComponentName2 (\r
             ImageHandle,\r
             SystemTable,\r
             &gPciBusDriverBinding,\r
             ImageHandle,\r
             &gPciBusComponentName,\r
             &gPciBusComponentName2\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  if (FeaturePcdGet (PcdPciBusHotplugDeviceSupport)) {\r
    //\r
    // If Hot Plug is supported, install EFI PCI Hot Plug Request protocol.\r
    //\r
    Handle = NULL;\r
    Status = gBS->InstallProtocolInterface (\r
                    &Handle,\r
                    &gEfiPciHotPlugRequestProtocolGuid,\r
                    EFI_NATIVE_INTERFACE,\r
                    &mPciHotPlugRequest\r
                    );\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Test to see if this driver supports ControllerHandle. Any ControllerHandle\r
  than contains a gEfiPciRootBridgeIoProtocolGuid protocol can be supported.\r
\r
  @param  This                Protocol instance pointer.\r
  @param  Controller          Handle of device to test.\r
  @param  RemainingDevicePath Optional parameter use to pick a specific child.\r
                              device to start.\r
\r
  @retval EFI_SUCCESS         This driver supports this device.\r
  @retval EFI_ALREADY_STARTED This driver is already running on this device.\r
  @retval other               This driver does not support this device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusDriverBindingSupported (\r
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,\r
  IN EFI_HANDLE                     Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath\r
  )\r
{\r
  EFI_STATUS                      Status;\r
  EFI_DEVICE_PATH_PROTOCOL        *ParentDevicePath;\r
  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;\r
  EFI_DEV_PATH_PTR                Node;\r
\r
  //\r
  // Check RemainingDevicePath validation\r
  //\r
  if (RemainingDevicePath != NULL) {\r
    //\r
    // Check if RemainingDevicePath is the End of Device Path Node, \r
    // if yes, go on checking other conditions\r
    //\r
    if (!IsDevicePathEnd (RemainingDevicePath)) {\r
      //\r
      // If RemainingDevicePath isn't the End of Device Path Node,\r
      // check its validation\r
      //\r
      Node.DevPath = RemainingDevicePath;\r
      if (Node.DevPath->Type != HARDWARE_DEVICE_PATH ||\r
          Node.DevPath->SubType != HW_PCI_DP         ||\r
          DevicePathNodeLength(Node.DevPath) != sizeof(PCI_DEVICE_PATH)) {\r
        return EFI_UNSUPPORTED;\r
      }\r
    }\r
  }\r
\r
  //\r
  // Check if Pci Root Bridge IO protocol is installed by platform\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiPciRootBridgeIoProtocolGuid,\r
                  (VOID **) &PciRootBridgeIo,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER\r
                  );\r
  if (Status == EFI_ALREADY_STARTED) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Close the I/O Abstraction(s) used to perform the supported test\r
  //\r
  gBS->CloseProtocol (\r
        Controller,\r
        &gEfiPciRootBridgeIoProtocolGuid,\r
        This->DriverBindingHandle,\r
        Controller\r
        );\r
\r
  //\r
  // Open the EFI Device Path protocol needed to perform the supported test\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiDevicePathProtocolGuid,\r
                  (VOID **) &ParentDevicePath,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER\r
                  );\r
  if (Status == EFI_ALREADY_STARTED) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Close protocol, don't use device path protocol in the Support() function\r
  //\r
  gBS->CloseProtocol (\r
        Controller,\r
        &gEfiDevicePathProtocolGuid,\r
        This->DriverBindingHandle,\r
        Controller\r
        );\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Start this driver on ControllerHandle and enumerate Pci bus and start\r
  all device under PCI bus.\r
\r
  @param  This                 Protocol instance pointer.\r
  @param  Controller           Handle of device to bind driver to.\r
  @param  RemainingDevicePath  Optional parameter use to pick a specific child.\r
                               device to start.\r
\r
  @retval EFI_SUCCESS          This driver is added to ControllerHandle.\r
  @retval EFI_ALREADY_STARTED  This driver is already running on ControllerHandle.\r
  @retval other                This driver does not support this device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusDriverBindingStart (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath\r
  )\r
{\r
  EFI_STATUS                Status;\r
  EFI_DEVICE_PATH_PROTOCOL  *ParentDevicePath;\r
\r
  //\r
  // Check RemainingDevicePath validation\r
  //\r
  if (RemainingDevicePath != NULL) {\r
    //\r
    // Check if RemainingDevicePath is the End of Device Path Node, \r
    // if yes, return EFI_SUCCESS\r
    //\r
    if (IsDevicePathEnd (RemainingDevicePath)) {\r
      return EFI_SUCCESS;\r
    }\r
  }\r
\r
  Status = gBS->LocateProtocol (\r
                  &gEfiIncompatiblePciDeviceSupportProtocolGuid,\r
                  NULL,\r
                  (VOID **) &gEfiIncompatiblePciDeviceSupport\r
                  );\r
\r
  //\r
  // If PCI Platform protocol is available, get it now.\r
  // If the platform implements this, it must be installed before BDS phase\r
  //\r
  gPciPlatformProtocol = NULL;\r
  gBS->LocateProtocol (\r
        &gEfiPciPlatformProtocolGuid,\r
        NULL,\r
        (VOID **) &gPciPlatformProtocol\r
        );\r
\r
  //\r
  // If PCI Platform protocol doesn't exist, try to Pci Override Protocol.\r
  //\r
  if (gPciPlatformProtocol == NULL) { \r
    gPciOverrideProtocol = NULL;\r
    gBS->LocateProtocol (\r
          &gEfiPciOverrideProtocolGuid,\r
          NULL,\r
          (VOID **) &gPciOverrideProtocol\r
          );\r
  }  \r
\r
  if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r
    gFullEnumeration = FALSE;\r
  } else {\r
    gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));\r
  }\r
\r
  //\r
  // Open Device Path Protocol for PCI root bridge\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiDevicePathProtocolGuid,\r
                  (VOID **) &ParentDevicePath,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );  \r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Report Status Code to indicate PCI bus starts\r
  //\r
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (\r
    EFI_PROGRESS_CODE,\r
    (EFI_IO_BUS_PCI | EFI_IOB_PC_INIT),\r
    ParentDevicePath\r
    );\r
\r
  //\r
  // Enumerate the entire host bridge\r
  // After enumeration, a database that records all the device information will be created\r
  //\r
  //\r
  Status = PciEnumerator (Controller);\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Start all the devices under the entire host bridge.\r
  //\r
  StartPciDevices (Controller);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Stop this driver on ControllerHandle. Support stoping any child handles\r
  created by this driver.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  Controller        Handle of device to stop driver on.\r
  @param  NumberOfChildren  Number of Handles in ChildHandleBuffer. If number of\r
                            children is zero stop the entire bus driver.\r
  @param  ChildHandleBuffer List of Child Handles to Stop.\r
\r
  @retval EFI_SUCCESS       This driver is removed ControllerHandle.\r
  @retval other             This driver was not removed from this device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusDriverBindingStop (\r
  IN  EFI_DRIVER_BINDING_PROTOCOL   *This,\r
  IN  EFI_HANDLE                    Controller,\r
  IN  UINTN                         NumberOfChildren,\r
  IN  EFI_HANDLE                    *ChildHandleBuffer\r
  )\r
{\r
  EFI_STATUS  Status;\r
  UINTN       Index;\r
  BOOLEAN     AllChildrenStopped;\r
\r
  if (NumberOfChildren == 0) {\r
    //\r
    // Close the bus driver\r
    //\r
    gBS->CloseProtocol (\r
          Controller,\r
          &gEfiDevicePathProtocolGuid,\r
          This->DriverBindingHandle,\r
          Controller\r
          );\r
    gBS->CloseProtocol (\r
          Controller,\r
          &gEfiPciRootBridgeIoProtocolGuid,\r
          This->DriverBindingHandle,\r
          Controller\r
          );\r
\r
    DestroyRootBridgeByHandle (\r
      Controller\r
      );\r
\r
    return EFI_SUCCESS;\r
  }\r
\r
  //\r
  // Stop all the children\r
  //\r
\r
  AllChildrenStopped = TRUE;\r
\r
  for (Index = 0; Index < NumberOfChildren; Index++) {\r
\r
    //\r
    // De register all the pci device\r
    //\r
    Status = DeRegisterPciDevice (Controller, ChildHandleBuffer[Index]);\r
\r
    if (EFI_ERROR (Status)) {\r
      AllChildrenStopped = FALSE;\r
    }\r
  }\r
\r
  if (!AllChildrenStopped) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
Commit	Line	Data
9060e3ec	1	/** @file\r
	2	Driver Binding functions for PCI Bus module.\r
	3	\r
	4	Single PCI bus driver instance will manager all PCI Root Bridges in one EFI based firmware,\r
	5	since all PCI Root Bridges' resources need to be managed together.\r
	6	Supported() function will try to get PCI Root Bridge IO Protocol.\r
	7	Start() function will get PCI Host Bridge Resource Allocation Protocol to manage all\r
	8	PCI Root Bridges. So it means platform needs install PCI Root Bridge IO protocol for each\r
	9	PCI Root Bus and install PCI Host Bridge Resource Allocation Protocol.\r
	10	\r
37623a5c	11	Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r
cd5ebaa0	12	This program and the accompanying materials\r
9060e3ec	13	are licensed and made available under the terms and conditions of the BSD License\r
	14	which accompanies this distribution. The full text of the license may be found at\r
	15	http://opensource.org/licenses/bsd-license.php\r
	16	\r
	17	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	18	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	19	\r
	20	**/\r
	21	\r
	22	#include "PciBus.h"\r
	23	\r
	24	//\r
	25	// PCI Bus Driver Global Variables\r
	26	//\r
	27	EFI_DRIVER_BINDING_PROTOCOL gPciBusDriverBinding = {\r
	28	PciBusDriverBindingSupported,\r
	29	PciBusDriverBindingStart,\r
	30	PciBusDriverBindingStop,\r
	31	0xa,\r
	32	NULL,\r
	33	NULL\r
	34	};\r
	35	\r
	36	EFI_HANDLE gPciHostBrigeHandles[PCI_MAX_HOST_BRIDGE_NUM];\r
	37	EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL *gEfiIncompatiblePciDeviceSupport = NULL;\r
	38	UINTN gPciHostBridgeNumber = 0;\r
	39	BOOLEAN gFullEnumeration = TRUE;\r
	40	UINT64 gAllOne = 0xFFFFFFFFFFFFFFFFULL;\r
	41	UINT64 gAllZero = 0;\r
	42	\r
	43	EFI_PCI_PLATFORM_PROTOCOL *gPciPlatformProtocol;\r
	44	EFI_PCI_OVERRIDE_PROTOCOL *gPciOverrideProtocol;\r
	45	\r
	46	\r
	47	GLOBAL_REMOVE_IF_UNREFERENCED EFI_PCI_HOTPLUG_REQUEST_PROTOCOL mPciHotPlugRequest = {\r
	48	PciHotPlugRequestNotify\r
	49	};\r
	50	\r
	51	/**\r
	52	The Entry Point for PCI Bus module. The user code starts with this function.\r
	53	\r
	54	Installs driver module protocols and. Creates virtual device handles for ConIn,\r
	55	ConOut, and StdErr. Installs Simple Text In protocol, Simple Text In Ex protocol,\r
	56	Simple Pointer protocol, Absolute Pointer protocol on those virtual handlers.\r
	57	Installs Graphics Output protocol and/or UGA Draw protocol if needed.\r
	58	\r
	59	@param[in] ImageHandle The firmware allocated handle for the EFI image.\r
	60	@param[in] SystemTable A pointer to the EFI System Table.\r
	61	\r
	62	@retval EFI_SUCCESS The entry point is executed successfully.\r
	63	@retval other Some error occurred when executing this entry point.\r
	64	\r
	65	**/\r
	66	EFI_STATUS\r
	67	EFIAPI\r
	68	PciBusEntryPoint (\r
	69	IN EFI_HANDLE ImageHandle,\r
	70	IN EFI_SYSTEM_TABLE *SystemTable\r
	71	)\r
	72	{\r
	73	EFI_STATUS Status;\r
	74	EFI_HANDLE Handle;\r
	75	\r
	76	//\r
77	// Initializes PCI devices pool\r
78	//\r
79	InitializePciDevicePool ();\r
80	\r
81	//\r
82	// Install driver model protocol(s).\r
83	//\r
84	Status = EfiLibInstallDriverBindingComponentName2 (\r
85	ImageHandle,\r
86	SystemTable,\r
87	&gPciBusDriverBinding,\r
88	ImageHandle,\r
89	&gPciBusComponentName,\r
90	&gPciBusComponentName2\r
91	);\r
92	ASSERT_EFI_ERROR (Status);\r
93	\r
94	if (FeaturePcdGet (PcdPciBusHotplugDeviceSupport)) {\r
95	//\r
96	// If Hot Plug is supported, install EFI PCI Hot Plug Request protocol.\r
97	//\r
98	Handle = NULL;\r
99	Status = gBS->InstallProtocolInterface (\r
100	&Handle,\r
101	&gEfiPciHotPlugRequestProtocolGuid,\r
102	EFI_NATIVE_INTERFACE,\r
103	&mPciHotPlugRequest\r
104	);\r
105	}\r
106	\r
107	return Status;\r
108	}\r
109	\r
110	/**\r
111	Test to see if this driver supports ControllerHandle. Any ControllerHandle\r
112	than contains a gEfiPciRootBridgeIoProtocolGuid protocol can be supported.\r
113	\r
114	@param This Protocol instance pointer.\r
115	@param Controller Handle of device to test.\r
116	@param RemainingDevicePath Optional parameter use to pick a specific child.\r
117	device to start.\r
118	\r
119	@retval EFI_SUCCESS This driver supports this device.\r
120	@retval EFI_ALREADY_STARTED This driver is already running on this device.\r
121	@retval other This driver does not support this device.\r
122	\r
123	**/\r
124	EFI_STATUS\r
125	EFIAPI\r
126	PciBusDriverBindingSupported (\r
127	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
128	IN EFI_HANDLE Controller,\r
129	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
130	)\r
131	{\r
132	EFI_STATUS Status;\r
133	EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;\r
134	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;\r
135	EFI_DEV_PATH_PTR Node;\r
136	\r
137	//\r
138	// Check RemainingDevicePath validation\r
139	//\r
140	if (RemainingDevicePath != NULL) {\r
141	//\r
142	// Check if RemainingDevicePath is the End of Device Path Node, \r
143	// if yes, go on checking other conditions\r
144	//\r
145	if (!IsDevicePathEnd (RemainingDevicePath)) {\r
146	//\r
147	// If RemainingDevicePath isn't the End of Device Path Node,\r
148	// check its validation\r
149	//\r
150	Node.DevPath = RemainingDevicePath;\r
151	if (Node.DevPath->Type != HARDWARE_DEVICE_PATH \|\|\r
152	Node.DevPath->SubType != HW_PCI_DP \|\|\r
153	DevicePathNodeLength(Node.DevPath) != sizeof(PCI_DEVICE_PATH)) {\r
154	return EFI_UNSUPPORTED;\r
155	}\r
156	}\r
157	}\r
158	\r
159	//\r
160	// Check if Pci Root Bridge IO protocol is installed by platform\r
161	//\r
162	Status = gBS->OpenProtocol (\r
163	Controller,\r
164	&gEfiPciRootBridgeIoProtocolGuid,\r
165	(VOID **) &PciRootBridgeIo,\r
166	This->DriverBindingHandle,\r
167	Controller,\r
168	EFI_OPEN_PROTOCOL_BY_DRIVER\r
169	);\r
170	if (Status == EFI_ALREADY_STARTED) {\r
171	return EFI_SUCCESS;\r
172	}\r
173	\r
174	if (EFI_ERROR (Status)) {\r
175	return Status;\r
176	}\r
177	\r
178	//\r
179	// Close the I/O Abstraction(s) used to perform the supported test\r
180	//\r
181	gBS->CloseProtocol (\r
182	Controller,\r
183	&gEfiPciRootBridgeIoProtocolGuid,\r
184	This->DriverBindingHandle,\r
185	Controller\r
186	);\r
187	\r
188	//\r
189	// Open the EFI Device Path protocol needed to perform the supported test\r
190	//\r
191	Status = gBS->OpenProtocol (\r
192	Controller,\r
193	&gEfiDevicePathProtocolGuid,\r
194	(VOID **) &ParentDevicePath,\r
195	This->DriverBindingHandle,\r
196	Controller,\r
197	EFI_OPEN_PROTOCOL_BY_DRIVER\r
198	);\r
199	if (Status == EFI_ALREADY_STARTED) {\r
200	return EFI_SUCCESS;\r
201	}\r
202	\r
203	if (EFI_ERROR (Status)) {\r
204	return Status;\r
205	}\r
206	\r
207	//\r
208	// Close protocol, don't use device path protocol in the Support() function\r
209	//\r
210	gBS->CloseProtocol (\r
211	Controller,\r
212	&gEfiDevicePathProtocolGuid,\r
213	This->DriverBindingHandle,\r
214	Controller\r
215	);\r
216	\r
217	return EFI_SUCCESS;\r
218	}\r
219	\r
220	/**\r
221	Start this driver on ControllerHandle and enumerate Pci bus and start\r
222	all device under PCI bus.\r
223	\r
224	@param This Protocol instance pointer.\r
225	@param Controller Handle of device to bind driver to.\r
226	@param RemainingDevicePath Optional parameter use to pick a specific child.\r
227	device to start.\r
228	\r
229	@retval EFI_SUCCESS This driver is added to ControllerHandle.\r
230	@retval EFI_ALREADY_STARTED This driver is already running on ControllerHandle.\r
231	@retval other This driver does not support this device.\r
232	\r
233	**/\r
234	EFI_STATUS\r
235	EFIAPI\r
236	PciBusDriverBindingStart (\r
237	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
238	IN EFI_HANDLE Controller,\r
239	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
240	)\r
241	{\r
37623a5c	242	EFI_STATUS Status;\r
37623a5c	243	EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;\r
9060e3ec	244	\r
	245	//\r
	246	// Check RemainingDevicePath validation\r
	247	//\r
	248	if (RemainingDevicePath != NULL) {\r
	249	//\r
	250	// Check if RemainingDevicePath is the End of Device Path Node, \r
	251	// if yes, return EFI_SUCCESS\r
	252	//\r
	253	if (IsDevicePathEnd (RemainingDevicePath)) {\r
	254	return EFI_SUCCESS;\r
	255	}\r
	256	}\r
	257	\r
	258	Status = gBS->LocateProtocol (\r
	259	&gEfiIncompatiblePciDeviceSupportProtocolGuid,\r
	260	NULL,\r
	261	(VOID **) &gEfiIncompatiblePciDeviceSupport\r
	262	);\r
	263	\r
	264	//\r
	265	// If PCI Platform protocol is available, get it now.\r
	266	// If the platform implements this, it must be installed before BDS phase\r
	267	//\r
	268	gPciPlatformProtocol = NULL;\r
	269	gBS->LocateProtocol (\r
	270	&gEfiPciPlatformProtocolGuid,\r
	271	NULL,\r
	272	(VOID **) &gPciPlatformProtocol\r
	273	);\r
	274	\r
	275	//\r
	276	// If PCI Platform protocol doesn't exist, try to Pci Override Protocol.\r
	277	//\r
	278	if (gPciPlatformProtocol == NULL) { \r
	279	gPciOverrideProtocol = NULL;\r
	280	gBS->LocateProtocol (\r
	281	&gEfiPciOverrideProtocolGuid,\r
	282	NULL,\r
	283	(VOID **) &gPciOverrideProtocol\r
	284	);\r
	285	} \r
	286	\r
5624a27d WL	287	if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r
	288	gFullEnumeration = FALSE;\r
	289	} else {\r
	290	gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));\r
	291	}\r
9060e3ec	292	\r
37623a5c	293	//\r
	294	// Open Device Path Protocol for PCI root bridge\r
	295	//\r
	296	Status = gBS->OpenProtocol (\r
	297	Controller,\r
	298	&gEfiDevicePathProtocolGuid,\r
	299	(VOID **) &ParentDevicePath,\r
	300	This->DriverBindingHandle,\r
	301	Controller,\r
	302	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	303	); \r
	304	ASSERT_EFI_ERROR (Status);\r
	305	\r
	306	//\r
	307	// Report Status Code to indicate PCI bus starts\r
	308	//\r
	309	REPORT_STATUS_CODE_WITH_DEVICE_PATH (\r
	310	EFI_PROGRESS_CODE,\r
	311	(EFI_IO_BUS_PCI \| EFI_IOB_PC_INIT),\r
	312	ParentDevicePath\r
	313	);\r
	314	\r
9060e3ec	315	//\r
	316	// Enumerate the entire host bridge\r
	317	// After enumeration, a database that records all the device information will be created\r
	318	//\r
	319	//\r
	320	Status = PciEnumerator (Controller);\r
	321	\r
	322	if (EFI_ERROR (Status)) {\r
	323	return Status;\r
	324	}\r
	325	\r
	326	//\r
	327	// Start all the devices under the entire host bridge.\r
	328	//\r
	329	StartPciDevices (Controller);\r
	330	\r
	331	return EFI_SUCCESS;\r
	332	}\r
	333	\r
	334	/**\r
	335	Stop this driver on ControllerHandle. Support stoping any child handles\r
	336	created by this driver.\r
	337	\r
	338	@param This Protocol instance pointer.\r
	339	@param Controller Handle of device to stop driver on.\r
	340	@param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of\r
	341	children is zero stop the entire bus driver.\r
	342	@param ChildHandleBuffer List of Child Handles to Stop.\r
	343	\r
	344	@retval EFI_SUCCESS This driver is removed ControllerHandle.\r
	345	@retval other This driver was not removed from this device.\r
	346	\r
	347	**/\r
	348	EFI_STATUS\r
	349	EFIAPI\r
	350	PciBusDriverBindingStop (\r
	351	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	352	IN EFI_HANDLE Controller,\r
	353	IN UINTN NumberOfChildren,\r
	354	IN EFI_HANDLE *ChildHandleBuffer\r
	355	)\r
	356	{\r
	357	EFI_STATUS Status;\r
	358	UINTN Index;\r
	359	BOOLEAN AllChildrenStopped;\r
	360	\r
	361	if (NumberOfChildren == 0) {\r
	362	//\r
	363	// Close the bus driver\r
	364	//\r
	365	gBS->CloseProtocol (\r
	366	Controller,\r
	367	&gEfiDevicePathProtocolGuid,\r
	368	This->DriverBindingHandle,\r
	369	Controller\r
	370	);\r
	371	gBS->CloseProtocol (\r
	372	Controller,\r
	373	&gEfiPciRootBridgeIoProtocolGuid,\r
	374	This->DriverBindingHandle,\r
	375	Controller\r
	376	);\r
	377	\r
	378	DestroyRootBridgeByHandle (\r
379	Controller\r
380	);\r
381	\r
382	return EFI_SUCCESS;\r
383	}\r
384	\r
385	//\r
386	// Stop all the children\r
387	//\r
388	\r
389	AllChildrenStopped = TRUE;\r
390	\r
391	for (Index = 0; Index < NumberOfChildren; Index++) {\r
392	\r
393	//\r
394	// De register all the pci device\r
395	//\r
396	Status = DeRegisterPciDevice (Controller, ChildHandleBuffer[Index]);\r
397	\r
398	if (EFI_ERROR (Status)) {\r
399	AllChildrenStopped = FALSE;\r
400	}\r
401	}\r
402	\r
403	if (!AllChildrenStopped) {\r
404	return EFI_DEVICE_ERROR;\r
405	}\r
406	\r
407	return EFI_SUCCESS;\r
408	}\r
409	\r