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/*++
Copyright (c) 2005 - 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.
Module Name:
PciBus.c
Abstract:
PCI Bus Driver
Revision History
--*/
#include "PciBus.h"
//
// PCI Bus Support Function Prototypes
//
EFI_STATUS
EFIAPI
PciBusEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
);
EFI_STATUS
EFIAPI
PciBusDriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
);
EFI_STATUS
EFIAPI
PciBusDriverBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
);
EFI_STATUS
EFIAPI
PciBusDriverBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
);
//
// PCI Bus Driver Global Variables
//
EFI_DRIVER_BINDING_PROTOCOL gPciBusDriverBinding = {
PciBusDriverBindingSupported,
PciBusDriverBindingStart,
PciBusDriverBindingStop,
0xa,
NULL,
NULL
};
BOOLEAN gFullEnumeration;
UINT64 gAllOne = 0xFFFFFFFFFFFFFFFFULL;
UINT64 gAllZero = 0;
//
// PCI Bus Driver Support Functions
//
EFI_STATUS
EFIAPI
PciBusEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
/*++
Routine Description:
Initialize the global variables
publish the driver binding protocol
Arguments:
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
Returns:
EFI_SUCCESS
EFI_DEVICE_ERROR
--*/
{
EFI_STATUS Status;
//
// Initialize the EFI Driver Library
//
Status = EfiLibInstallDriverBindingComponentName2 (
ImageHandle,
SystemTable,
&gPciBusDriverBinding,
ImageHandle,
&gPciBusComponentName,
&gPciBusComponentName2
);
ASSERT_EFI_ERROR (Status);
InitializePciDevicePool ();
gFullEnumeration = TRUE;
return Status;
}
EFI_STATUS
EFIAPI
PciBusDriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
/*++
Routine Description:
Check to see if pci bus driver supports the given controller
Arguments:
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
Returns:
EFI_SUCCESS
--*/
{
EFI_STATUS Status;
EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
EFI_DEV_PATH_PTR Node;
if (RemainingDevicePath != NULL) {
Node.DevPath = RemainingDevicePath;
if (Node.DevPath->Type != HARDWARE_DEVICE_PATH ||
Node.DevPath->SubType != HW_PCI_DP ||
DevicePathNodeLength(Node.DevPath) != sizeof(PCI_DEVICE_PATH)) {
return EFI_UNSUPPORTED;
}
}
//
// Open the IO Abstraction(s) needed to perform the supported test
//
Status = gBS->OpenProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
(VOID **) &ParentDevicePath,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (Status == EFI_ALREADY_STARTED) {
return EFI_SUCCESS;
}
if (EFI_ERROR (Status)) {
return Status;
}
gBS->CloseProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
This->DriverBindingHandle,
Controller
);
Status = gBS->OpenProtocol (
Controller,
&gEfiPciRootBridgeIoProtocolGuid,
(VOID **) &PciRootBridgeIo,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (Status == EFI_ALREADY_STARTED) {
return EFI_SUCCESS;
}
if (EFI_ERROR (Status)) {
return Status;
}
gBS->CloseProtocol (
Controller,
&gEfiPciRootBridgeIoProtocolGuid,
This->DriverBindingHandle,
Controller
);
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
PciBusDriverBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
/*++
Routine Description:
Start to management the controller passed in
Arguments:
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
Returns:
--*/
{
EFI_STATUS Status;
//
// Enumerate the entire host bridge
// After enumeration, a database that records all the device information will be created
//
//
Status = PciEnumerator (Controller);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Enable PCI device specified by remaining device path. BDS or other driver can call the
// start more than once.
//
StartPciDevices (Controller, RemainingDevicePath);
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
PciBusDriverBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
)
/*++
Routine Description:
Stop one or more children created at start of pci bus driver
if all the the children get closed, close the protocol
Arguments:
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
Returns:
--*/
{
EFI_STATUS Status;
UINTN Index;
BOOLEAN AllChildrenStopped;
if (NumberOfChildren == 0) {
//
// Close the bus driver
//
gBS->CloseProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
This->DriverBindingHandle,
Controller
);
gBS->CloseProtocol (
Controller,
&gEfiPciRootBridgeIoProtocolGuid,
This->DriverBindingHandle,
Controller
);
DestroyRootBridgeByHandle (
Controller
);
return EFI_SUCCESS;
}
//
// Stop all the children
//
AllChildrenStopped = TRUE;
for (Index = 0; Index < NumberOfChildren; Index++) {
//
// De register all the pci device
//
Status = DeRegisterPciDevice (Controller, ChildHandleBuffer[Index]);
if (EFI_ERROR (Status)) {
AllChildrenStopped = FALSE;
}
}
if (!AllChildrenStopped) {
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
|
