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168 lines
8.7 KiB
C
168 lines
8.7 KiB
C
/** @file
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This file declares Incompatible PCI Device Support Protocol
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Allows the PCI bus driver to support resource allocation for some PCI devices
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that do not comply with the PCI Specification.
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@par Note:
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This protocol is optional. Only those platforms that implement this protocol
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will have the capability to support incompatible PCI devices. The absence of
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this protocol can cause the PCI bus driver to configure these incompatible
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PCI devices incorrectly. As a result, these devices may not work properly.
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The EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL is used by the PCI bus driver
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to support resource allocation for some PCI devices that do not comply with the
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PCI Specification. This protocol can find some incompatible PCI devices and
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report their special resource requirements to the PCI bus driver. The generic
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PCI bus driver does not have prior knowledge of any incompatible PCI devices.
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It interfaces with the EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL to find out
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if a device is incompatible and to obtain the special configuration requirements
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for a specific incompatible PCI device.
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This protocol is optional, and only one instance of this protocol can be present
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in the system. If a platform supports this protocol, this protocol is produced
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by a Driver Execution Environment (DXE) driver and must be made available before
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the Boot Device Selection (BDS) phase. The PCI bus driver will look for the
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presence of this protocol before it begins PCI enumeration. If this protocol
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exists in a platform, it indicates that the platform has the capability to support
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those incompatible PCI devices. However, final support for incompatible PCI
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devices still depends on the implementation of the PCI bus driver. The PCI bus
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driver may fully, partially, or not even support these incompatible devices.
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During PCI bus enumeration, the PCI bus driver will probe the PCI Base Address
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Registers (BARs) for each PCI device regardless of whether the PCI device is
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incompatible or not to determine the resource requirements so that the PCI bus
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driver can invoke the proper PCI resources for them. Generally, this resource
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information includes the following:
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- Resource type
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- Resource length
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- Alignment
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However, some incompatible PCI devices may have special requirements. As a result,
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the length or the alignment that is derived through BAR probing may not be exactly
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the same as the actual resource requirement of the device. For example, there
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are some devices that request I/O resources at a length of 0x100 from their I/O
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BAR, but these incompatible devices will never work correctly if an odd I/O base
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address, such as 0x100, 0x300, or 0x500, is assigned to the BAR. Instead, these
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devices request an even base address, such as 0x200 or 0x400. The Incompatible
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PCI Device Support Protocol can then be used to obtain these special resource
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requirements for these incompatible PCI devices. In this way, the PCI bus driver
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will take special consideration for these devices during PCI resource allocation
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to ensure that they can work correctly.
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This protocol may support the following incompatible PCI BAR types:
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- I/O or memory length that is different from what the BAR reports
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- I/O or memory alignment that is different from what the BAR reports
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- Fixed I/O or memory base address
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See the Conventional PCI Specification 3.0 for the details of how a PCI BAR
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reports the resource length and the alignment that it requires.
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Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This Protocol is defined in UEFI Platform Initialization Specification 1.2
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Volume 5: Standards
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**/
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#ifndef _INCOMPATIBLE_PCI_DEVICE_SUPPORT_H_
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#define _INCOMPATIBLE_PCI_DEVICE_SUPPORT_H_
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///
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/// Global ID for EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL
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///
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#define EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL_GUID \
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{ \
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0xeb23f55a, 0x7863, 0x4ac2, {0x8d, 0x3d, 0x95, 0x65, 0x35, 0xde, 0x03, 0x75} \
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}
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///
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/// Forward declaration for EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL
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///
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typedef struct _EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL;
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/**
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Returns a list of ACPI resource descriptors that detail the special resource
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configuration requirements for an incompatible PCI device.
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This function returns a list of ACPI resource descriptors that detail the
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special resource configuration requirements for an incompatible PCI device.
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Prior to bus enumeration, the PCI bus driver will look for the presence
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of the EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL. Only one instance of this
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protocol can be present in the system. For each PCI device that the PCI bus
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driver discovers, the PCI bus driver calls this function with the device's vendor
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ID, device ID, revision ID, subsystem vendor ID, and subsystem device ID. If the
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VendorId, DeviceId, RevisionId, SubsystemVendorId, or SubsystemDeviceId value is
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set to (UINTN)-1, that field will be ignored. The ID values that are not (UINTN)-1
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will be used to identify the current device.
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This function will only return EFI_SUCCESS. However, if the device is an
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incompatible PCI device, a list of ACPI resource descriptors will be returned
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in Configuration. Otherwise, NULL will be returned in Configuration instead.
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The PCI bus driver does not need to allocate memory for Configuration. However,
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it is the PCI bus driver's responsibility to free it. The PCI bus driver then
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can configure this device with the information that is derived from this list
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of resource nodes, rather than the result of BAR probing.
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Only the following two resource descriptor types from the ACPI Specification
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may be used to describe the incompatible PCI device resource requirements:
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- QWORD Address Space Descriptor (ACPI 2.0, section 6.4.3.5.1; also ACPI 3.0)
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- End Tag (ACPI 2.0, section 6.4.2.8; also ACPI 3.0)
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The QWORD Address Space Descriptor can describe memory, I/O, and bus number
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ranges for dynamic or fixed resources. The configuration of a PCI root bridge
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is described with one or more QWORD Address Space Descriptors, followed by an
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End Tag. See the ACPI Specification for details on the field values.
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@param[in] This Pointer to the EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL
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instance.
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@param[in] VendorId A unique ID to identify the manufacturer of
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the PCI device. See the Conventional PCI
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Specification 3.0 for details.
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@param[in] DeviceId A unique ID to identify the particular PCI
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device. See the Conventional PCI Specification
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3.0 for details.
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@param[in] RevisionId A PCI device-specific revision identifier.
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See the Conventional PCI Specification 3.0
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for details.
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@param[in] SubsystemVendorId Specifies the subsystem vendor ID. See the
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Conventional PCI Specification 3.0 for details.
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@param[in] SubsystemDeviceId Specifies the subsystem device ID. See the
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Conventional PCI Specification 3.0 for details.
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@param[out] Configuration A list of ACPI resource descriptors that detail
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the configuration requirement.
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@retval EFI_SUCCESS The function always returns EFI_SUCCESS.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_CHECK_DEVICE)(
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IN EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL *This,
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IN UINTN VendorId,
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IN UINTN DeviceId,
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IN UINTN RevisionId,
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IN UINTN SubsystemVendorId,
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IN UINTN SubsystemDeviceId,
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OUT VOID **Configuration
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);
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///
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/// Interface structure for the Incompatible PCI Device Support Protocol
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///
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struct _EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL {
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///
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/// Returns a list of ACPI resource descriptors that detail any special
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/// resource configuration requirements if the specified device is a recognized
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/// incompatible PCI device.
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///
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EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_CHECK_DEVICE CheckDevice;
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};
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extern EFI_GUID gEfiIncompatiblePciDeviceSupportProtocolGuid;
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#endif
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