532 lines
18 KiB
C
532 lines
18 KiB
C
/*******************************************************************************
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*
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* Module Name: hwpci - Obtain PCI bus, device, and function numbers
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*
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******************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __HWPCI_C__
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#include "acpi.h"
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#include "accommon.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("hwpci")
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/* PCI configuration space values */
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#define PCI_CFG_HEADER_TYPE_REG 0x0E
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#define PCI_CFG_PRIMARY_BUS_NUMBER_REG 0x18
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#define PCI_CFG_SECONDARY_BUS_NUMBER_REG 0x19
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/* PCI header values */
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#define PCI_HEADER_TYPE_MASK 0x7F
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#define PCI_TYPE_BRIDGE 0x01
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#define PCI_TYPE_CARDBUS_BRIDGE 0x02
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typedef struct acpi_pci_device
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{
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ACPI_HANDLE Device;
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struct acpi_pci_device *Next;
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} ACPI_PCI_DEVICE;
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/* Local prototypes */
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static ACPI_STATUS
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AcpiHwBuildPciList (
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ACPI_HANDLE RootPciDevice,
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ACPI_HANDLE PciRegion,
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ACPI_PCI_DEVICE **ReturnListHead);
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static ACPI_STATUS
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AcpiHwProcessPciList (
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ACPI_PCI_ID *PciId,
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ACPI_PCI_DEVICE *ListHead);
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static void
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AcpiHwDeletePciList (
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ACPI_PCI_DEVICE *ListHead);
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static ACPI_STATUS
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AcpiHwGetPciDeviceInfo (
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ACPI_PCI_ID *PciId,
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ACPI_HANDLE PciDevice,
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UINT16 *BusNumber,
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BOOLEAN *IsBridge);
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwDerivePciId
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*
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* PARAMETERS: PciId - Initial values for the PCI ID. May be
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* modified by this function.
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* RootPciDevice - A handle to a PCI device object. This
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* object must be a PCI Root Bridge having a
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* _HID value of either PNP0A03 or PNP0A08
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* PciRegion - A handle to a PCI configuration space
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* Operation Region being initialized
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function derives a full PCI ID for a PCI device,
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* consisting of a Segment number, Bus number, Device number,
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* and function code.
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*
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* The PCI hardware dynamically configures PCI bus numbers
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* depending on the bus topology discovered during system
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* initialization. This function is invoked during configuration
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* of a PCI_Config Operation Region in order to (possibly) update
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* the Bus/Device/Function numbers in the PciId with the actual
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* values as determined by the hardware and operating system
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* configuration.
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*
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* The PciId parameter is initially populated during the Operation
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* Region initialization. This function is then called, and is
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* will make any necessary modifications to the Bus, Device, or
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* Function number PCI ID subfields as appropriate for the
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* current hardware and OS configuration.
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*
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* NOTE: Created 08/2010. Replaces the previous OSL AcpiOsDerivePciId
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* interface since this feature is OS-independent. This module
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* specifically avoids any use of recursion by building a local
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* temporary device list.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiHwDerivePciId (
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ACPI_PCI_ID *PciId,
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ACPI_HANDLE RootPciDevice,
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ACPI_HANDLE PciRegion)
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{
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ACPI_STATUS Status;
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ACPI_PCI_DEVICE *ListHead = NULL;
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ACPI_FUNCTION_TRACE (HwDerivePciId);
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if (!PciId)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Build a list of PCI devices, from PciRegion up to RootPciDevice */
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Status = AcpiHwBuildPciList (RootPciDevice, PciRegion, &ListHead);
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if (ACPI_SUCCESS (Status))
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{
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/* Walk the list, updating the PCI device/function/bus numbers */
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Status = AcpiHwProcessPciList (PciId, ListHead);
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}
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/* Always delete the list */
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AcpiHwDeletePciList (ListHead);
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwBuildPciList
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*
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* PARAMETERS: RootPciDevice - A handle to a PCI device object. This
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* object is guaranteed to be a PCI Root
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* Bridge having a _HID value of either
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* PNP0A03 or PNP0A08
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* PciRegion - A handle to the PCI configuration space
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* Operation Region
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* ReturnListHead - Where the PCI device list is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Builds a list of devices from the input PCI region up to the
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* Root PCI device for this namespace subtree.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiHwBuildPciList (
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ACPI_HANDLE RootPciDevice,
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ACPI_HANDLE PciRegion,
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ACPI_PCI_DEVICE **ReturnListHead)
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{
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ACPI_HANDLE CurrentDevice;
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ACPI_HANDLE ParentDevice;
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ACPI_STATUS Status;
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ACPI_PCI_DEVICE *ListElement;
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ACPI_PCI_DEVICE *ListHead = NULL;
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/*
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* Ascend namespace branch until the RootPciDevice is reached, building
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* a list of device nodes. Loop will exit when either the PCI device is
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* found, or the root of the namespace is reached.
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*/
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CurrentDevice = PciRegion;
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while (1)
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{
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Status = AcpiGetParent (CurrentDevice, &ParentDevice);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/* Finished when we reach the PCI root device (PNP0A03 or PNP0A08) */
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if (ParentDevice == RootPciDevice)
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{
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*ReturnListHead = ListHead;
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return (AE_OK);
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}
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ListElement = ACPI_ALLOCATE (sizeof (ACPI_PCI_DEVICE));
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if (!ListElement)
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{
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return (AE_NO_MEMORY);
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}
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/* Put new element at the head of the list */
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ListElement->Next = ListHead;
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ListElement->Device = ParentDevice;
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ListHead = ListElement;
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CurrentDevice = ParentDevice;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwProcessPciList
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*
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* PARAMETERS: PciId - Initial values for the PCI ID. May be
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* modified by this function.
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* ListHead - Device list created by
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* AcpiHwBuildPciList
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*
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* RETURN: Status
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*
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* DESCRIPTION: Walk downward through the PCI device list, getting the device
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* info for each, via the PCI configuration space and updating
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* the PCI ID as necessary. Deletes the list during traversal.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiHwProcessPciList (
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ACPI_PCI_ID *PciId,
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ACPI_PCI_DEVICE *ListHead)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_PCI_DEVICE *Info;
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UINT16 BusNumber;
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BOOLEAN IsBridge = TRUE;
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ACPI_FUNCTION_NAME (HwProcessPciList);
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ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
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"Input PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X\n",
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PciId->Segment, PciId->Bus, PciId->Device, PciId->Function));
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BusNumber = PciId->Bus;
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/*
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* Descend down the namespace tree, collecting PCI device, function,
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* and bus numbers. BusNumber is only important for PCI bridges.
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* Algorithm: As we descend the tree, use the last valid PCI device,
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* function, and bus numbers that are discovered, and assign them
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* to the PCI ID for the target device.
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*/
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Info = ListHead;
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while (Info)
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{
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Status = AcpiHwGetPciDeviceInfo (PciId, Info->Device,
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&BusNumber, &IsBridge);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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Info = Info->Next;
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
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"Output PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X "
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"Status %X BusNumber %X IsBridge %X\n",
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PciId->Segment, PciId->Bus, PciId->Device, PciId->Function,
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Status, BusNumber, IsBridge));
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwDeletePciList
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*
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* PARAMETERS: ListHead - Device list created by
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* AcpiHwBuildPciList
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*
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* RETURN: None
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*
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* DESCRIPTION: Free the entire PCI list.
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*
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******************************************************************************/
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static void
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AcpiHwDeletePciList (
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ACPI_PCI_DEVICE *ListHead)
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{
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ACPI_PCI_DEVICE *Next;
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ACPI_PCI_DEVICE *Previous;
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Next = ListHead;
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while (Next)
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{
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Previous = Next;
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Next = Previous->Next;
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ACPI_FREE (Previous);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiHwGetPciDeviceInfo
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*
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* PARAMETERS: PciId - Initial values for the PCI ID. May be
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* modified by this function.
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* PciDevice - Handle for the PCI device object
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* BusNumber - Where a PCI bridge bus number is returned
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* IsBridge - Return value, indicates if this PCI
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* device is a PCI bridge
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get the device info for a single PCI device object. Get the
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* _ADR (contains PCI device and function numbers), and for PCI
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* bridge devices, get the bus number from PCI configuration
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* space.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiHwGetPciDeviceInfo (
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ACPI_PCI_ID *PciId,
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ACPI_HANDLE PciDevice,
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UINT16 *BusNumber,
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BOOLEAN *IsBridge)
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{
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ACPI_STATUS Status;
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ACPI_OBJECT_TYPE ObjectType;
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UINT64 ReturnValue;
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UINT64 PciValue;
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/* We only care about objects of type Device */
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Status = AcpiGetType (PciDevice, &ObjectType);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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if (ObjectType != ACPI_TYPE_DEVICE)
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{
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return (AE_OK);
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}
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/* We need an _ADR. Ignore device if not present */
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Status = AcpiUtEvaluateNumericObject (METHOD_NAME__ADR,
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PciDevice, &ReturnValue);
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if (ACPI_FAILURE (Status))
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{
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return (AE_OK);
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}
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/*
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* From _ADR, get the PCI Device and Function and
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* update the PCI ID.
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*/
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PciId->Device = ACPI_HIWORD (ACPI_LODWORD (ReturnValue));
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PciId->Function = ACPI_LOWORD (ACPI_LODWORD (ReturnValue));
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/*
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* If the previous device was a bridge, use the previous
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* device bus number
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*/
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if (*IsBridge)
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{
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PciId->Bus = *BusNumber;
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}
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/*
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* Get the bus numbers from PCI Config space:
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*
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* First, get the PCI HeaderType
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*/
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*IsBridge = FALSE;
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Status = AcpiOsReadPciConfiguration (PciId,
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PCI_CFG_HEADER_TYPE_REG, &PciValue, 8);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/* We only care about bridges (1=PciBridge, 2=CardBusBridge) */
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PciValue &= PCI_HEADER_TYPE_MASK;
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if ((PciValue != PCI_TYPE_BRIDGE) &&
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(PciValue != PCI_TYPE_CARDBUS_BRIDGE))
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{
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return (AE_OK);
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}
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/* Bridge: Get the Primary BusNumber */
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Status = AcpiOsReadPciConfiguration (PciId,
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PCI_CFG_PRIMARY_BUS_NUMBER_REG, &PciValue, 8);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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*IsBridge = TRUE;
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PciId->Bus = (UINT16) PciValue;
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/* Bridge: Get the Secondary BusNumber */
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Status = AcpiOsReadPciConfiguration (PciId,
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PCI_CFG_SECONDARY_BUS_NUMBER_REG, &PciValue, 8);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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*BusNumber = (UINT16) PciValue;
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return (AE_OK);
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}
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