464 lines
14 KiB
C
464 lines
14 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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* Copyright (C) 2000 - 2014, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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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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/* Delete the list */
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AcpiHwDeletePciList (ListHead);
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}
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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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/* Must delete the list before exit */
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AcpiHwDeletePciList (*ReturnListHead);
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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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/* Must delete the list before exit */
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AcpiHwDeletePciList (*ReturnListHead);
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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 (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 (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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