drivers/acpi/hardware/hwacpi.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
   5  *
   6  *****************************************************************************/
   7
   8 /******************************************************************************
   9  *
  10  * 1. Copyright Notice
  11  *
  12  * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
  13  * All rights reserved.
  14  *
  15  * 2. License
  16  *
  17  * 2.1. This is your license from Intel Corp. under its intellectual property
  18  * rights.  You may have additional license terms from the party that provided
  19  * you this software, covering your right to use that party's intellectual
  20  * property rights.
  21  *
  22  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  23  * copy of the source code appearing in this file ("Covered Code") an
  24  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  25  * base code distributed originally by Intel ("Original Intel Code") to copy,
  26  * make derivatives, distribute, use and display any portion of the Covered
  27  * Code in any form, with the right to sublicense such rights; and
  28  *
  29  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  30  * license (with the right to sublicense), under only those claims of Intel
  31  * patents that are infringed by the Original Intel Code, to make, use, sell,
  32  * offer to sell, and import the Covered Code and derivative works thereof
  33  * solely to the minimum extent necessary to exercise the above copyright
  34  * license, and in no event shall the patent license extend to any additions
  35  * to or modifications of the Original Intel Code.  No other license or right
  36  * is granted directly or by implication, estoppel or otherwise;
  37  *
  38  * The above copyright and patent license is granted only if the following
  39  * conditions are met:
  40  *
  41  * 3. Conditions
  42  *
  43  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  44  * Redistribution of source code of any substantial portion of the Covered
  45  * Code or modification with rights to further distribute source must include
  46  * the above Copyright Notice, the above License, this list of Conditions,
  47  * and the following Disclaimer and Export Compliance provision.  In addition,
  48  * Licensee must cause all Covered Code to which Licensee contributes to
  49  * contain a file documenting the changes Licensee made to create that Covered
  50  * Code and the date of any change.  Licensee must include in that file the
  51  * documentation of any changes made by any predecessor Licensee.  Licensee
  52  * must include a prominent statement that the modification is derived,
  53  * directly or indirectly, from Original Intel Code.
  54  *
  55  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  56  * Redistribution of source code of any substantial portion of the Covered
  57  * Code or modification without rights to further distribute source must
  58  * include the following Disclaimer and Export Compliance provision in the
  59  * documentation and/or other materials provided with distribution.  In
  60  * addition, Licensee may not authorize further sublicense of source of any
  61  * portion of the Covered Code, and must include terms to the effect that the
  62  * license from Licensee to its licensee is limited to the intellectual
  63  * property embodied in the software Licensee provides to its licensee, and
  64  * not to intellectual property embodied in modifications its licensee may
  65  * make.
  66  *
  67  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  68  * substantial portion of the Covered Code or modification must reproduce the
  69  * above Copyright Notice, and the following Disclaimer and Export Compliance
  70  * provision in the documentation and/or other materials provided with the
  71  * distribution.
  72  *
  73  * 3.4. Intel retains all right, title, and interest in and to the Original
  74  * Intel Code.
  75  *
  76  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  77  * Intel shall be used in advertising or otherwise to promote the sale, use or
  78  * other dealings in products derived from or relating to the Covered Code
  79  * without prior written authorization from Intel.
  80  *
  81  * 4. Disclaimer and Export Compliance
  82  *
  83  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  84  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  85  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  86  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  87  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  88  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  89  * PARTICULAR PURPOSE.
  90  *
  91  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  92  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  93  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  94  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  95  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  96  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  97  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  98  * LIMITED REMEDY.
  99  *
 100  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 101  * software or system incorporating such software without first obtaining any
 102  * required license or other approval from the U. S. Department of Commerce or
 103  * any other agency or department of the United States Government.  In the
 104  * event Licensee exports any such software from the United States or
 105  * re-exports any such software from a foreign destination, Licensee shall
 106  * ensure that the distribution and export/re-export of the software is in
 107  * compliance with all laws, regulations, orders, or other restrictions of the
 108  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 109  * any of its subsidiaries will export/re-export any technical data, process,
 110  * software, or service, directly or indirectly, to any country for which the
 111  * United States government or any agency thereof requires an export license,
 112  * other governmental approval, or letter of assurance, without first obtaining
 113  * such license, approval or letter.
 114  *
 115  *****************************************************************************/
 116
 117 #define __HWACPI_C__
 118
 119 #include "acpi.h"
 120 #include "accommon.h"
 121
 122
 123 #define _COMPONENT          ACPI_HARDWARE
 124         ACPI_MODULE_NAME    ("hwacpi")
 125
 126
 127 /******************************************************************************
 128  *
 129  * FUNCTION:    AcpiHwSetMode
 130  *
 131  * PARAMETERS:  Mode            - SYS_MODE_ACPI or SYS_MODE_LEGACY
 132  *
 133  * RETURN:      Status
 134  *
 135  * DESCRIPTION: Transitions the system into the requested mode.
 136  *
 137  ******************************************************************************/
 138
 139 ACPI_STATUS
 140 AcpiHwSetMode (
 141     UINT32                  Mode)
 142 {
 143
 144     ACPI_STATUS             Status;
 145     UINT32                  Retry;
 146
 147
 148     ACPI_FUNCTION_TRACE (HwSetMode);
 149
 150     /*
 151      * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
 152      * system does not support mode transition.
 153      */
 154     if (!AcpiGbl_FADT.SmiCommand)
 155     {
 156         ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed"));
 157         return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 158     }
 159
 160     /*
 161      * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
 162      * in FADT: If it is zero, enabling or disabling is not supported.
 163      * As old systems may have used zero for mode transition,
 164      * we make sure both the numbers are zero to determine these
 165      * transitions are not supported.
 166      */
 167     if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable)
 168     {
 169         ACPI_ERROR ((AE_INFO,
 170             "No ACPI mode transition supported in this system "
 171             "(enable/disable both zero)"));
 172         return_ACPI_STATUS (AE_OK);
 173     }
 174
 175     switch (Mode)
 176     {
 177     case ACPI_SYS_MODE_ACPI:
 178
 179         /* BIOS should have disabled ALL fixed and GP events */
 180
 181         Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
 182                         (UINT32) AcpiGbl_FADT.AcpiEnable, 8);
 183         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
 184         break;
 185
 186     case ACPI_SYS_MODE_LEGACY:
 187
 188         /*
 189          * BIOS should clear all fixed status bits and restore fixed event
 190          * enable bits to default
 191          */
 192         Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
 193                     (UINT32) AcpiGbl_FADT.AcpiDisable, 8);
 194         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 195                     "Attempting to enable Legacy (non-ACPI) mode\n"));
 196         break;
 197
 198     default:
 199         return_ACPI_STATUS (AE_BAD_PARAMETER);
 200     }
 201
 202     if (ACPI_FAILURE (Status))
 203     {
 204         ACPI_EXCEPTION ((AE_INFO, Status,
 205             "Could not write ACPI mode change"));
 206         return_ACPI_STATUS (Status);
 207     }
 208
 209     /*
 210      * Some hardware takes a LONG time to switch modes. Give them 3 sec to
 211      * do so, but allow faster systems to proceed more quickly.
 212      */
 213     Retry = 3000;
 214     while (Retry)
 215     {
 216         if (AcpiHwGetMode() == Mode)
 217         {
 218             ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n",
 219                 Mode));
 220             return_ACPI_STATUS (AE_OK);
 221         }
 222         AcpiOsStall(1000);
 223         Retry--;
 224     }
 225
 226     ACPI_ERROR ((AE_INFO, "Hardware did not change modes"));
 227     return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 228 }
 229
 230
 231 /*******************************************************************************
 232  *
 233  * FUNCTION:    AcpiHwGetMode
 234  *
 235  * PARAMETERS:  none
 236  *
 237  * RETURN:      SYS_MODE_ACPI or SYS_MODE_LEGACY
 238  *
 239  * DESCRIPTION: Return current operating state of system.  Determined by
 240  *              querying the SCI_EN bit.
 241  *
 242  ******************************************************************************/
 243
 244 UINT32
 245 AcpiHwGetMode (
 246     void)
 247 {
 248     ACPI_STATUS             Status;
 249     UINT32                  Value;
 250
 251
 252     ACPI_FUNCTION_TRACE (HwGetMode);
 253
 254
 255     /*
 256      * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
 257      * system does not support mode transition.
 258      */
 259     if (!AcpiGbl_FADT.SmiCommand)
 260     {
 261         return_UINT32 (ACPI_SYS_MODE_ACPI);
 262     }
 263
 264     Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value);
 265     if (ACPI_FAILURE (Status))
 266     {
 267         return_UINT32 (ACPI_SYS_MODE_LEGACY);
 268     }
 269
 270     if (Value)
 271     {
 272         return_UINT32 (ACPI_SYS_MODE_ACPI);
 273     }
 274     else
 275     {
 276         return_UINT32 (ACPI_SYS_MODE_LEGACY);
 277     }
 278 }