drivers/bus/acpi/acpica/hardware/hwpci.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: hwpci - Obtain PCI bus, device, and function numbers
   4  *
   5  ******************************************************************************/
   6
   7 /******************************************************************************
   8  *
   9  * 1. Copyright Notice
  10  *
  11  * Some or all of this work - Copyright (c) 1999 - 2014, Intel Corp.
  12  * All rights reserved.
  13  *
  14  * 2. License
  15  *
  16  * 2.1. This is your license from Intel Corp. under its intellectual property
  17  * rights. You may have additional license terms from the party that provided
  18  * you this software, covering your right to use that party's intellectual
  19  * property rights.
  20  *
  21  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  22  * copy of the source code appearing in this file ("Covered Code") an
  23  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  24  * base code distributed originally by Intel ("Original Intel Code") to copy,
  25  * make derivatives, distribute, use and display any portion of the Covered
  26  * Code in any form, with the right to sublicense such rights; and
  27  *
  28  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  29  * license (with the right to sublicense), under only those claims of Intel
  30  * patents that are infringed by the Original Intel Code, to make, use, sell,
  31  * offer to sell, and import the Covered Code and derivative works thereof
  32  * solely to the minimum extent necessary to exercise the above copyright
  33  * license, and in no event shall the patent license extend to any additions
  34  * to or modifications of the Original Intel Code. No other license or right
  35  * is granted directly or by implication, estoppel or otherwise;
  36  *
  37  * The above copyright and patent license is granted only if the following
  38  * conditions are met:
  39  *
  40  * 3. Conditions
  41  *
  42  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  43  * Redistribution of source code of any substantial portion of the Covered
  44  * Code or modification with rights to further distribute source must include
  45  * the above Copyright Notice, the above License, this list of Conditions,
  46  * and the following Disclaimer and Export Compliance provision. In addition,
  47  * Licensee must cause all Covered Code to which Licensee contributes to
  48  * contain a file documenting the changes Licensee made to create that Covered
  49  * Code and the date of any change. Licensee must include in that file the
  50  * documentation of any changes made by any predecessor Licensee. Licensee
  51  * must include a prominent statement that the modification is derived,
  52  * directly or indirectly, from Original Intel Code.
  53  *
  54  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  55  * Redistribution of source code of any substantial portion of the Covered
  56  * Code or modification without rights to further distribute source must
  57  * include the following Disclaimer and Export Compliance provision in the
  58  * documentation and/or other materials provided with distribution. In
  59  * addition, Licensee may not authorize further sublicense of source of any
  60  * portion of the Covered Code, and must include terms to the effect that the
  61  * license from Licensee to its licensee is limited to the intellectual
  62  * property embodied in the software Licensee provides to its licensee, and
  63  * not to intellectual property embodied in modifications its licensee may
  64  * make.
  65  *
  66  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  67  * substantial portion of the Covered Code or modification must reproduce the
  68  * above Copyright Notice, and the following Disclaimer and Export Compliance
  69  * provision in the documentation and/or other materials provided with the
  70  * distribution.
  71  *
  72  * 3.4. Intel retains all right, title, and interest in and to the Original
  73  * Intel Code.
  74  *
  75  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  76  * Intel shall be used in advertising or otherwise to promote the sale, use or
  77  * other dealings in products derived from or relating to the Covered Code
  78  * without prior written authorization from Intel.
  79  *
  80  * 4. Disclaimer and Export Compliance
  81  *
  82  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  83  * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  84  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
  85  * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
  86  * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
  87  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  88  * PARTICULAR PURPOSE.
  89  *
  90  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  91  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  92  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  93  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  94  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  95  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
  96  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  97  * LIMITED REMEDY.
  98  *
  99  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 100  * software or system incorporating such software without first obtaining any
 101  * required license or other approval from the U. S. Department of Commerce or
 102  * any other agency or department of the United States Government. In the
 103  * event Licensee exports any such software from the United States or
 104  * re-exports any such software from a foreign destination, Licensee shall
 105  * ensure that the distribution and export/re-export of the software is in
 106  * compliance with all laws, regulations, orders, or other restrictions of the
 107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 108  * any of its subsidiaries will export/re-export any technical data, process,
 109  * software, or service, directly or indirectly, to any country for which the
 110  * United States government or any agency thereof requires an export license,
 111  * other governmental approval, or letter of assurance, without first obtaining
 112  * such license, approval or letter.
 113  *
 114  *****************************************************************************/
 115
 116 #define __HWPCI_C__
 117
 118 #include "acpi.h"
 119 #include "accommon.h"
 120
 121
 122 #define _COMPONENT          ACPI_NAMESPACE
 123         ACPI_MODULE_NAME    ("hwpci")
 124
 125
 126 /* PCI configuration space values */
 127
 128 #define PCI_CFG_HEADER_TYPE_REG             0x0E
 129 #define PCI_CFG_PRIMARY_BUS_NUMBER_REG      0x18
 130 #define PCI_CFG_SECONDARY_BUS_NUMBER_REG    0x19
 131
 132 /* PCI header values */
 133
 134 #define PCI_HEADER_TYPE_MASK                0x7F
 135 #define PCI_TYPE_BRIDGE                     0x01
 136 #define PCI_TYPE_CARDBUS_BRIDGE             0x02
 137
 138 typedef struct acpi_pci_device
 139 {
 140     ACPI_HANDLE             Device;
 141     struct acpi_pci_device  *Next;
 142
 143 } ACPI_PCI_DEVICE;
 144
 145
 146 /* Local prototypes */
 147
 148 static ACPI_STATUS
 149 AcpiHwBuildPciList (
 150     ACPI_HANDLE             RootPciDevice,
 151     ACPI_HANDLE             PciRegion,
 152     ACPI_PCI_DEVICE         **ReturnListHead);
 153
 154 static ACPI_STATUS
 155 AcpiHwProcessPciList (
 156     ACPI_PCI_ID             *PciId,
 157     ACPI_PCI_DEVICE         *ListHead);
 158
 159 static void
 160 AcpiHwDeletePciList (
 161     ACPI_PCI_DEVICE         *ListHead);
 162
 163 static ACPI_STATUS
 164 AcpiHwGetPciDeviceInfo (
 165     ACPI_PCI_ID             *PciId,
 166     ACPI_HANDLE             PciDevice,
 167     UINT16                  *BusNumber,
 168     BOOLEAN                 *IsBridge);
 169
 170
 171 /*******************************************************************************
 172  *
 173  * FUNCTION:    AcpiHwDerivePciId
 174  *
 175  * PARAMETERS:  PciId               - Initial values for the PCI ID. May be
 176  *                                    modified by this function.
 177  *              RootPciDevice       - A handle to a PCI device object. This
 178  *                                    object must be a PCI Root Bridge having a
 179  *                                    _HID value of either PNP0A03 or PNP0A08
 180  *              PciRegion           - A handle to a PCI configuration space
 181  *                                    Operation Region being initialized
 182  *
 183  * RETURN:      Status
 184  *
 185  * DESCRIPTION: This function derives a full PCI ID for a PCI device,
 186  *              consisting of a Segment number, Bus number, Device number,
 187  *              and function code.
 188  *
 189  *              The PCI hardware dynamically configures PCI bus numbers
 190  *              depending on the bus topology discovered during system
 191  *              initialization. This function is invoked during configuration
 192  *              of a PCI_Config Operation Region in order to (possibly) update
 193  *              the Bus/Device/Function numbers in the PciId with the actual
 194  *              values as determined by the hardware and operating system
 195  *              configuration.
 196  *
 197  *              The PciId parameter is initially populated during the Operation
 198  *              Region initialization. This function is then called, and is
 199  *              will make any necessary modifications to the Bus, Device, or
 200  *              Function number PCI ID subfields as appropriate for the
 201  *              current hardware and OS configuration.
 202  *
 203  * NOTE:        Created 08/2010. Replaces the previous OSL AcpiOsDerivePciId
 204  *              interface since this feature is OS-independent. This module
 205  *              specifically avoids any use of recursion by building a local
 206  *              temporary device list.
 207  *
 208  ******************************************************************************/
 209
 210 ACPI_STATUS
 211 AcpiHwDerivePciId (
 212     ACPI_PCI_ID             *PciId,
 213     ACPI_HANDLE             RootPciDevice,
 214     ACPI_HANDLE             PciRegion)
 215 {
 216     ACPI_STATUS             Status;
 217     ACPI_PCI_DEVICE         *ListHead = NULL;
 218
 219
 220     ACPI_FUNCTION_TRACE (HwDerivePciId);
 221
 222
 223     if (!PciId)
 224     {
 225         return_ACPI_STATUS (AE_BAD_PARAMETER);
 226     }
 227
 228     /* Build a list of PCI devices, from PciRegion up to RootPciDevice */
 229
 230     Status = AcpiHwBuildPciList (RootPciDevice, PciRegion, &ListHead);
 231     if (ACPI_SUCCESS (Status))
 232     {
 233         /* Walk the list, updating the PCI device/function/bus numbers */
 234
 235         Status = AcpiHwProcessPciList (PciId, ListHead);
 236     }
 237
 238     /* Always delete the list */
 239
 240     AcpiHwDeletePciList (ListHead);
 241     return_ACPI_STATUS (Status);
 242 }
 243
 244
 245 /*******************************************************************************
 246  *
 247  * FUNCTION:    AcpiHwBuildPciList
 248  *
 249  * PARAMETERS:  RootPciDevice       - A handle to a PCI device object. This
 250  *                                    object is guaranteed to be a PCI Root
 251  *                                    Bridge having a _HID value of either
 252  *                                    PNP0A03 or PNP0A08
 253  *              PciRegion           - A handle to the PCI configuration space
 254  *                                    Operation Region
 255  *              ReturnListHead      - Where the PCI device list is returned
 256  *
 257  * RETURN:      Status
 258  *
 259  * DESCRIPTION: Builds a list of devices from the input PCI region up to the
 260  *              Root PCI device for this namespace subtree.
 261  *
 262  ******************************************************************************/
 263
 264 static ACPI_STATUS
 265 AcpiHwBuildPciList (
 266     ACPI_HANDLE             RootPciDevice,
 267     ACPI_HANDLE             PciRegion,
 268     ACPI_PCI_DEVICE         **ReturnListHead)
 269 {
 270     ACPI_HANDLE             CurrentDevice;
 271     ACPI_HANDLE             ParentDevice;
 272     ACPI_STATUS             Status;
 273     ACPI_PCI_DEVICE         *ListElement;
 274     ACPI_PCI_DEVICE         *ListHead = NULL;
 275
 276
 277     /*
 278      * Ascend namespace branch until the RootPciDevice is reached, building
 279      * a list of device nodes. Loop will exit when either the PCI device is
 280      * found, or the root of the namespace is reached.
 281      */
 282     CurrentDevice = PciRegion;
 283     while (1)
 284     {
 285         Status = AcpiGetParent (CurrentDevice, &ParentDevice);
 286         if (ACPI_FAILURE (Status))
 287         {
 288             return (Status);
 289         }
 290
 291         /* Finished when we reach the PCI root device (PNP0A03 or PNP0A08) */
 292
 293         if (ParentDevice == RootPciDevice)
 294         {
 295             *ReturnListHead = ListHead;
 296             return (AE_OK);
 297         }
 298
 299         ListElement = ACPI_ALLOCATE (sizeof (ACPI_PCI_DEVICE));
 300         if (!ListElement)
 301         {
 302             return (AE_NO_MEMORY);
 303         }
 304
 305         /* Put new element at the head of the list */
 306
 307         ListElement->Next = ListHead;
 308         ListElement->Device = ParentDevice;
 309         ListHead = ListElement;
 310
 311         CurrentDevice = ParentDevice;
 312     }
 313 }
 314
 315
 316 /*******************************************************************************
 317  *
 318  * FUNCTION:    AcpiHwProcessPciList
 319  *
 320  * PARAMETERS:  PciId               - Initial values for the PCI ID. May be
 321  *                                    modified by this function.
 322  *              ListHead            - Device list created by
 323  *                                    AcpiHwBuildPciList
 324  *
 325  * RETURN:      Status
 326  *
 327  * DESCRIPTION: Walk downward through the PCI device list, getting the device
 328  *              info for each, via the PCI configuration space and updating
 329  *              the PCI ID as necessary. Deletes the list during traversal.
 330  *
 331  ******************************************************************************/
 332
 333 static ACPI_STATUS
 334 AcpiHwProcessPciList (
 335     ACPI_PCI_ID             *PciId,
 336     ACPI_PCI_DEVICE         *ListHead)
 337 {
 338     ACPI_STATUS             Status = AE_OK;
 339     ACPI_PCI_DEVICE         *Info;
 340     UINT16                  BusNumber;
 341     BOOLEAN                 IsBridge = TRUE;
 342
 343
 344     ACPI_FUNCTION_NAME (HwProcessPciList);
 345
 346
 347     ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 348         "Input PciId:  Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X\n",
 349         PciId->Segment, PciId->Bus, PciId->Device, PciId->Function));
 350
 351     BusNumber = PciId->Bus;
 352
 353     /*
 354      * Descend down the namespace tree, collecting PCI device, function,
 355      * and bus numbers. BusNumber is only important for PCI bridges.
 356      * Algorithm: As we descend the tree, use the last valid PCI device,
 357      * function, and bus numbers that are discovered, and assign them
 358      * to the PCI ID for the target device.
 359      */
 360     Info = ListHead;
 361     while (Info)
 362     {
 363         Status = AcpiHwGetPciDeviceInfo (PciId, Info->Device,
 364             &BusNumber, &IsBridge);
 365         if (ACPI_FAILURE (Status))
 366         {
 367             return (Status);
 368         }
 369
 370         Info = Info->Next;
 371     }
 372
 373     ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 374         "Output PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X "
 375         "Status %X BusNumber %X IsBridge %X\n",
 376         PciId->Segment, PciId->Bus, PciId->Device, PciId->Function,
 377         Status, BusNumber, IsBridge));
 378
 379     return (AE_OK);
 380 }
 381
 382
 383 /*******************************************************************************
 384  *
 385  * FUNCTION:    AcpiHwDeletePciList
 386  *
 387  * PARAMETERS:  ListHead            - Device list created by
 388  *                                    AcpiHwBuildPciList
 389  *
 390  * RETURN:      None
 391  *
 392  * DESCRIPTION: Free the entire PCI list.
 393  *
 394  ******************************************************************************/
 395
 396 static void
 397 AcpiHwDeletePciList (
 398     ACPI_PCI_DEVICE         *ListHead)
 399 {
 400     ACPI_PCI_DEVICE         *Next;
 401     ACPI_PCI_DEVICE         *Previous;
 402
 403
 404     Next = ListHead;
 405     while (Next)
 406     {
 407         Previous = Next;
 408         Next = Previous->Next;
 409         ACPI_FREE (Previous);
 410     }
 411 }
 412
 413
 414 /*******************************************************************************
 415  *
 416  * FUNCTION:    AcpiHwGetPciDeviceInfo
 417  *
 418  * PARAMETERS:  PciId               - Initial values for the PCI ID. May be
 419  *                                    modified by this function.
 420  *              PciDevice           - Handle for the PCI device object
 421  *              BusNumber           - Where a PCI bridge bus number is returned
 422  *              IsBridge            - Return value, indicates if this PCI
 423  *                                    device is a PCI bridge
 424  *
 425  * RETURN:      Status
 426  *
 427  * DESCRIPTION: Get the device info for a single PCI device object. Get the
 428  *              _ADR (contains PCI device and function numbers), and for PCI
 429  *              bridge devices, get the bus number from PCI configuration
 430  *              space.
 431  *
 432  ******************************************************************************/
 433
 434 static ACPI_STATUS
 435 AcpiHwGetPciDeviceInfo (
 436     ACPI_PCI_ID             *PciId,
 437     ACPI_HANDLE             PciDevice,
 438     UINT16                  *BusNumber,
 439     BOOLEAN                 *IsBridge)
 440 {
 441     ACPI_STATUS             Status;
 442     ACPI_OBJECT_TYPE        ObjectType;
 443     UINT64                  ReturnValue;
 444     UINT64                  PciValue;
 445
 446
 447     /* We only care about objects of type Device */
 448
 449     Status = AcpiGetType (PciDevice, &ObjectType);
 450     if (ACPI_FAILURE (Status))
 451     {
 452         return (Status);
 453     }
 454
 455     if (ObjectType != ACPI_TYPE_DEVICE)
 456     {
 457         return (AE_OK);
 458     }
 459
 460     /* We need an _ADR. Ignore device if not present */
 461
 462     Status = AcpiUtEvaluateNumericObject (METHOD_NAME__ADR,
 463         PciDevice, &ReturnValue);
 464     if (ACPI_FAILURE (Status))
 465     {
 466         return (AE_OK);
 467     }
 468
 469     /*
 470      * From _ADR, get the PCI Device and Function and
 471      * update the PCI ID.
 472      */
 473     PciId->Device = ACPI_HIWORD (ACPI_LODWORD (ReturnValue));
 474     PciId->Function = ACPI_LOWORD (ACPI_LODWORD (ReturnValue));
 475
 476     /*
 477      * If the previous device was a bridge, use the previous
 478      * device bus number
 479      */
 480     if (*IsBridge)
 481     {
 482         PciId->Bus = *BusNumber;
 483     }
 484
 485     /*
 486      * Get the bus numbers from PCI Config space:
 487      *
 488      * First, get the PCI HeaderType
 489      */
 490     *IsBridge = FALSE;
 491     Status = AcpiOsReadPciConfiguration (PciId,
 492         PCI_CFG_HEADER_TYPE_REG, &PciValue, 8);
 493     if (ACPI_FAILURE (Status))
 494     {
 495         return (Status);
 496     }
 497
 498     /* We only care about bridges (1=PciBridge, 2=CardBusBridge) */
 499
 500     PciValue &= PCI_HEADER_TYPE_MASK;
 501
 502     if ((PciValue != PCI_TYPE_BRIDGE) &&
 503         (PciValue != PCI_TYPE_CARDBUS_BRIDGE))
 504     {
 505         return (AE_OK);
 506     }
 507
 508     /* Bridge: Get the Primary BusNumber */
 509
 510     Status = AcpiOsReadPciConfiguration (PciId,
 511         PCI_CFG_PRIMARY_BUS_NUMBER_REG, &PciValue, 8);
 512     if (ACPI_FAILURE (Status))
 513     {
 514         return (Status);
 515     }
 516
 517     *IsBridge = TRUE;
 518     PciId->Bus = (UINT16) PciValue;
 519
 520     /* Bridge: Get the Secondary BusNumber */
 521
 522     Status = AcpiOsReadPciConfiguration (PciId,
 523         PCI_CFG_SECONDARY_BUS_NUMBER_REG, &PciValue, 8);
 524     if (ACPI_FAILURE (Status))
 525     {
 526         return (Status);
 527     }
 528
 529     *BusNumber = (UINT16) PciValue;
 530     return (AE_OK);
 531 }