diff options
Diffstat (limited to 'hardware/hwpci.c')
| -rw-r--r-- | hardware/hwpci.c | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/hardware/hwpci.c b/hardware/hwpci.c new file mode 100644 index 000000000000..74c5f87a963e --- /dev/null +++ b/hardware/hwpci.c @@ -0,0 +1,531 @@ +/******************************************************************************* + * + * Module Name: hwpci - Obtain PCI bus, device, and function numbers + * + ******************************************************************************/ + +/****************************************************************************** + * + * 1. Copyright Notice + * + * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp. + * All rights reserved. + * + * 2. License + * + * 2.1. This is your license from Intel Corp. under its intellectual property + * rights. You may have additional license terms from the party that provided + * you this software, covering your right to use that party's intellectual + * property rights. + * + * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a + * copy of the source code appearing in this file ("Covered Code") an + * irrevocable, perpetual, worldwide license under Intel's copyrights in the + * base code distributed originally by Intel ("Original Intel Code") to copy, + * make derivatives, distribute, use and display any portion of the Covered + * Code in any form, with the right to sublicense such rights; and + * + * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent + * license (with the right to sublicense), under only those claims of Intel + * patents that are infringed by the Original Intel Code, to make, use, sell, + * offer to sell, and import the Covered Code and derivative works thereof + * solely to the minimum extent necessary to exercise the above copyright + * license, and in no event shall the patent license extend to any additions + * to or modifications of the Original Intel Code. No other license or right + * is granted directly or by implication, estoppel or otherwise; + * + * The above copyright and patent license is granted only if the following + * conditions are met: + * + * 3. Conditions + * + * 3.1. Redistribution of Source with Rights to Further Distribute Source. + * Redistribution of source code of any substantial portion of the Covered + * Code or modification with rights to further distribute source must include + * the above Copyright Notice, the above License, this list of Conditions, + * and the following Disclaimer and Export Compliance provision. In addition, + * Licensee must cause all Covered Code to which Licensee contributes to + * contain a file documenting the changes Licensee made to create that Covered + * Code and the date of any change. Licensee must include in that file the + * documentation of any changes made by any predecessor Licensee. Licensee + * must include a prominent statement that the modification is derived, + * directly or indirectly, from Original Intel Code. + * + * 3.2. Redistribution of Source with no Rights to Further Distribute Source. + * Redistribution of source code of any substantial portion of the Covered + * Code or modification without rights to further distribute source must + * include the following Disclaimer and Export Compliance provision in the + * documentation and/or other materials provided with distribution. In + * addition, Licensee may not authorize further sublicense of source of any + * portion of the Covered Code, and must include terms to the effect that the + * license from Licensee to its licensee is limited to the intellectual + * property embodied in the software Licensee provides to its licensee, and + * not to intellectual property embodied in modifications its licensee may + * make. + * + * 3.3. Redistribution of Executable. Redistribution in executable form of any + * substantial portion of the Covered Code or modification must reproduce the + * above Copyright Notice, and the following Disclaimer and Export Compliance + * provision in the documentation and/or other materials provided with the + * distribution. + * + * 3.4. Intel retains all right, title, and interest in and to the Original + * Intel Code. + * + * 3.5. Neither the name Intel nor any other trademark owned or controlled by + * Intel shall be used in advertising or otherwise to promote the sale, use or + * other dealings in products derived from or relating to the Covered Code + * without prior written authorization from Intel. + * + * 4. Disclaimer and Export Compliance + * + * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED + * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE + * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, + * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY + * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY + * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A + * PARTICULAR PURPOSE. + * + * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES + * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR + * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, + * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY + * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL + * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS + * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY + * LIMITED REMEDY. + * + * 4.3. Licensee shall not export, either directly or indirectly, any of this + * software or system incorporating such software without first obtaining any + * required license or other approval from the U. S. Department of Commerce or + * any other agency or department of the United States Government. In the + * event Licensee exports any such software from the United States or + * re-exports any such software from a foreign destination, Licensee shall + * ensure that the distribution and export/re-export of the software is in + * compliance with all laws, regulations, orders, or other restrictions of the + * U.S. Export Administration Regulations. Licensee agrees that neither it nor + * any of its subsidiaries will export/re-export any technical data, process, + * software, or service, directly or indirectly, to any country for which the + * United States government or any agency thereof requires an export license, + * other governmental approval, or letter of assurance, without first obtaining + * such license, approval or letter. + * + *****************************************************************************/ + +#define __HWPCI_C__ + +#include "acpi.h" +#include "accommon.h" + + +#define _COMPONENT ACPI_NAMESPACE + ACPI_MODULE_NAME ("hwpci") + + +/* PCI configuration space values */ + +#define PCI_CFG_HEADER_TYPE_REG 0x0E +#define PCI_CFG_PRIMARY_BUS_NUMBER_REG 0x18 +#define PCI_CFG_SECONDARY_BUS_NUMBER_REG 0x19 + +/* PCI header values */ + +#define PCI_HEADER_TYPE_MASK 0x7F +#define PCI_TYPE_BRIDGE 0x01 +#define PCI_TYPE_CARDBUS_BRIDGE 0x02 + +typedef struct acpi_pci_device +{ + ACPI_HANDLE Device; + struct acpi_pci_device *Next; + +} ACPI_PCI_DEVICE; + + +/* Local prototypes */ + +static ACPI_STATUS +AcpiHwBuildPciList ( + ACPI_HANDLE RootPciDevice, + ACPI_HANDLE PciRegion, + ACPI_PCI_DEVICE **ReturnListHead); + +static ACPI_STATUS +AcpiHwProcessPciList ( + ACPI_PCI_ID *PciId, + ACPI_PCI_DEVICE *ListHead); + +static void +AcpiHwDeletePciList ( + ACPI_PCI_DEVICE *ListHead); + +static ACPI_STATUS +AcpiHwGetPciDeviceInfo ( + ACPI_PCI_ID *PciId, + ACPI_HANDLE PciDevice, + UINT16 *BusNumber, + BOOLEAN *IsBridge); + + +/******************************************************************************* + * + * FUNCTION: AcpiHwDerivePciId + * + * PARAMETERS: PciId - Initial values for the PCI ID. May be + * modified by this function. + * RootPciDevice - A handle to a PCI device object. This + * object must be a PCI Root Bridge having a + * _HID value of either PNP0A03 or PNP0A08 + * PciRegion - A handle to a PCI configuration space + * Operation Region being initialized + * + * RETURN: Status + * + * DESCRIPTION: This function derives a full PCI ID for a PCI device, + * consisting of a Segment number, Bus number, Device number, + * and function code. + * + * The PCI hardware dynamically configures PCI bus numbers + * depending on the bus topology discovered during system + * initialization. This function is invoked during configuration + * of a PCI_Config Operation Region in order to (possibly) update + * the Bus/Device/Function numbers in the PciId with the actual + * values as determined by the hardware and operating system + * configuration. + * + * The PciId parameter is initially populated during the Operation + * Region initialization. This function is then called, and is + * will make any necessary modifications to the Bus, Device, or + * Function number PCI ID subfields as appropriate for the + * current hardware and OS configuration. + * + * NOTE: Created 08/2010. Replaces the previous OSL AcpiOsDerivePciId + * interface since this feature is OS-independent. This module + * specifically avoids any use of recursion by building a local + * temporary device list. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiHwDerivePciId ( + ACPI_PCI_ID *PciId, + ACPI_HANDLE RootPciDevice, + ACPI_HANDLE PciRegion) +{ + ACPI_STATUS Status; + ACPI_PCI_DEVICE *ListHead = NULL; + + + ACPI_FUNCTION_TRACE (HwDerivePciId); + + + if (!PciId) + { + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* Build a list of PCI devices, from PciRegion up to RootPciDevice */ + + Status = AcpiHwBuildPciList (RootPciDevice, PciRegion, &ListHead); + if (ACPI_SUCCESS (Status)) + { + /* Walk the list, updating the PCI device/function/bus numbers */ + + Status = AcpiHwProcessPciList (PciId, ListHead); + } + + /* Always delete the list */ + + AcpiHwDeletePciList (ListHead); + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiHwBuildPciList + * + * PARAMETERS: RootPciDevice - A handle to a PCI device object. This + * object is guaranteed to be a PCI Root + * Bridge having a _HID value of either + * PNP0A03 or PNP0A08 + * PciRegion - A handle to the PCI configuration space + * Operation Region + * ReturnListHead - Where the PCI device list is returned + * + * RETURN: Status + * + * DESCRIPTION: Builds a list of devices from the input PCI region up to the + * Root PCI device for this namespace subtree. + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiHwBuildPciList ( + ACPI_HANDLE RootPciDevice, + ACPI_HANDLE PciRegion, + ACPI_PCI_DEVICE **ReturnListHead) +{ + ACPI_HANDLE CurrentDevice; + ACPI_HANDLE ParentDevice; + ACPI_STATUS Status; + ACPI_PCI_DEVICE *ListElement; + ACPI_PCI_DEVICE *ListHead = NULL; + + + /* + * Ascend namespace branch until the RootPciDevice is reached, building + * a list of device nodes. Loop will exit when either the PCI device is + * found, or the root of the namespace is reached. + */ + CurrentDevice = PciRegion; + while (1) + { + Status = AcpiGetParent (CurrentDevice, &ParentDevice); + if (ACPI_FAILURE (Status)) + { + return (Status); + } + + /* Finished when we reach the PCI root device (PNP0A03 or PNP0A08) */ + + if (ParentDevice == RootPciDevice) + { + *ReturnListHead = ListHead; + return (AE_OK); + } + + ListElement = ACPI_ALLOCATE (sizeof (ACPI_PCI_DEVICE)); + if (!ListElement) + { + return (AE_NO_MEMORY); + } + + /* Put new element at the head of the list */ + + ListElement->Next = ListHead; + ListElement->Device = ParentDevice; + ListHead = ListElement; + + CurrentDevice = ParentDevice; + } +} + + +/******************************************************************************* + * + * FUNCTION: AcpiHwProcessPciList + * + * PARAMETERS: PciId - Initial values for the PCI ID. May be + * modified by this function. + * ListHead - Device list created by + * AcpiHwBuildPciList + * + * RETURN: Status + * + * DESCRIPTION: Walk downward through the PCI device list, getting the device + * info for each, via the PCI configuration space and updating + * the PCI ID as necessary. Deletes the list during traversal. + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiHwProcessPciList ( + ACPI_PCI_ID *PciId, + ACPI_PCI_DEVICE *ListHead) +{ + ACPI_STATUS Status = AE_OK; + ACPI_PCI_DEVICE *Info; + UINT16 BusNumber; + BOOLEAN IsBridge = TRUE; + + + ACPI_FUNCTION_NAME (HwProcessPciList); + + + ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, + "Input PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X\n", + PciId->Segment, PciId->Bus, PciId->Device, PciId->Function)); + + BusNumber = PciId->Bus; + + /* + * Descend down the namespace tree, collecting PCI device, function, + * and bus numbers. BusNumber is only important for PCI bridges. + * Algorithm: As we descend the tree, use the last valid PCI device, + * function, and bus numbers that are discovered, and assign them + * to the PCI ID for the target device. + */ + Info = ListHead; + while (Info) + { + Status = AcpiHwGetPciDeviceInfo (PciId, Info->Device, + &BusNumber, &IsBridge); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + Info = Info->Next; + } + + ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, + "Output PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X " + "Status %X BusNumber %X IsBridge %X\n", + PciId->Segment, PciId->Bus, PciId->Device, PciId->Function, + Status, BusNumber, IsBridge)); + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiHwDeletePciList + * + * PARAMETERS: ListHead - Device list created by + * AcpiHwBuildPciList + * + * RETURN: None + * + * DESCRIPTION: Free the entire PCI list. + * + ******************************************************************************/ + +static void +AcpiHwDeletePciList ( + ACPI_PCI_DEVICE *ListHead) +{ + ACPI_PCI_DEVICE *Next; + ACPI_PCI_DEVICE *Previous; + + + Next = ListHead; + while (Next) + { + Previous = Next; + Next = Previous->Next; + ACPI_FREE (Previous); + } +} + + +/******************************************************************************* + * + * FUNCTION: AcpiHwGetPciDeviceInfo + * + * PARAMETERS: PciId - Initial values for the PCI ID. May be + * modified by this function. + * PciDevice - Handle for the PCI device object + * BusNumber - Where a PCI bridge bus number is returned + * IsBridge - Return value, indicates if this PCI + * device is a PCI bridge + * + * RETURN: Status + * + * DESCRIPTION: Get the device info for a single PCI device object. Get the + * _ADR (contains PCI device and function numbers), and for PCI + * bridge devices, get the bus number from PCI configuration + * space. + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiHwGetPciDeviceInfo ( + ACPI_PCI_ID *PciId, + ACPI_HANDLE PciDevice, + UINT16 *BusNumber, + BOOLEAN *IsBridge) +{ + ACPI_STATUS Status; + ACPI_OBJECT_TYPE ObjectType; + UINT64 ReturnValue; + UINT64 PciValue; + + + /* We only care about objects of type Device */ + + Status = AcpiGetType (PciDevice, &ObjectType); + if (ACPI_FAILURE (Status)) + { + return (Status); + } + + if (ObjectType != ACPI_TYPE_DEVICE) + { + return (AE_OK); + } + + /* We need an _ADR. Ignore device if not present */ + + Status = AcpiUtEvaluateNumericObject (METHOD_NAME__ADR, + PciDevice, &ReturnValue); + if (ACPI_FAILURE (Status)) + { + return (AE_OK); + } + + /* + * From _ADR, get the PCI Device and Function and + * update the PCI ID. + */ + PciId->Device = ACPI_HIWORD (ACPI_LODWORD (ReturnValue)); + PciId->Function = ACPI_LOWORD (ACPI_LODWORD (ReturnValue)); + + /* + * If the previous device was a bridge, use the previous + * device bus number + */ + if (*IsBridge) + { + PciId->Bus = *BusNumber; + } + + /* + * Get the bus numbers from PCI Config space: + * + * First, get the PCI HeaderType + */ + *IsBridge = FALSE; + Status = AcpiOsReadPciConfiguration (PciId, + PCI_CFG_HEADER_TYPE_REG, &PciValue, 8); + if (ACPI_FAILURE (Status)) + { + return (Status); + } + + /* We only care about bridges (1=PciBridge, 2=CardBusBridge) */ + + PciValue &= PCI_HEADER_TYPE_MASK; + + if ((PciValue != PCI_TYPE_BRIDGE) && + (PciValue != PCI_TYPE_CARDBUS_BRIDGE)) + { + return (AE_OK); + } + + /* Bridge: Get the Primary BusNumber */ + + Status = AcpiOsReadPciConfiguration (PciId, + PCI_CFG_PRIMARY_BUS_NUMBER_REG, &PciValue, 8); + if (ACPI_FAILURE (Status)) + { + return (Status); + } + + *IsBridge = TRUE; + PciId->Bus = (UINT16) PciValue; + + /* Bridge: Get the Secondary BusNumber */ + + Status = AcpiOsReadPciConfiguration (PciId, + PCI_CFG_SECONDARY_BUS_NUMBER_REG, &PciValue, 8); + if (ACPI_FAILURE (Status)) + { + return (Status); + } + + *BusNumber = (UINT16) PciValue; + return (AE_OK); +} |