sys/contrib/dev/acpica-unix-20061109/hardware/hwacpi.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
   5  *              $Revision: 1.77 $
   6  *
   7  *****************************************************************************/
   8
   9 /******************************************************************************
  10  *
  11  * 1. Copyright Notice
  12  *
  13  * Some or all of this work - Copyright (c) 1999 - 2006, Intel Corp.
  14  * All rights reserved.
  15  *
  16  * 2. License
  17  *
  18  * 2.1. This is your license from Intel Corp. under its intellectual property
  19  * rights.  You may have additional license terms from the party that provided
  20  * you this software, covering your right to use that party's intellectual
  21  * property rights.
  22  *
  23  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  24  * copy of the source code appearing in this file ("Covered Code") an
  25  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  26  * base code distributed originally by Intel ("Original Intel Code") to copy,
  27  * make derivatives, distribute, use and display any portion of the Covered
  28  * Code in any form, with the right to sublicense such rights; and
  29  *
  30  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  31  * license (with the right to sublicense), under only those claims of Intel
  32  * patents that are infringed by the Original Intel Code, to make, use, sell,
  33  * offer to sell, and import the Covered Code and derivative works thereof
  34  * solely to the minimum extent necessary to exercise the above copyright
  35  * license, and in no event shall the patent license extend to any additions
  36  * to or modifications of the Original Intel Code.  No other license or right
  37  * is granted directly or by implication, estoppel or otherwise;
  38  *
  39  * The above copyright and patent license is granted only if the following
  40  * conditions are met:
  41  *
  42  * 3. Conditions
  43  *
  44  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  45  * Redistribution of source code of any substantial portion of the Covered
  46  * Code or modification with rights to further distribute source must include
  47  * the above Copyright Notice, the above License, this list of Conditions,
  48  * and the following Disclaimer and Export Compliance provision.  In addition,
  49  * Licensee must cause all Covered Code to which Licensee contributes to
  50  * contain a file documenting the changes Licensee made to create that Covered
  51  * Code and the date of any change.  Licensee must include in that file the
  52  * documentation of any changes made by any predecessor Licensee.  Licensee
  53  * must include a prominent statement that the modification is derived,
  54  * directly or indirectly, from Original Intel Code.
  55  *
  56  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  57  * Redistribution of source code of any substantial portion of the Covered
  58  * Code or modification without rights to further distribute source must
  59  * include the following Disclaimer and Export Compliance provision in the
  60  * documentation and/or other materials provided with distribution.  In
  61  * addition, Licensee may not authorize further sublicense of source of any
  62  * portion of the Covered Code, and must include terms to the effect that the
  63  * license from Licensee to its licensee is limited to the intellectual
  64  * property embodied in the software Licensee provides to its licensee, and
  65  * not to intellectual property embodied in modifications its licensee may
  66  * make.
  67  *
  68  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  69  * substantial portion of the Covered Code or modification must reproduce the
  70  * above Copyright Notice, and the following Disclaimer and Export Compliance
  71  * provision in the documentation and/or other materials provided with the
  72  * distribution.
  73  *
  74  * 3.4. Intel retains all right, title, and interest in and to the Original
  75  * Intel Code.
  76  *
  77  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  78  * Intel shall be used in advertising or otherwise to promote the sale, use or
  79  * other dealings in products derived from or relating to the Covered Code
  80  * without prior written authorization from Intel.
  81  *
  82  * 4. Disclaimer and Export Compliance
  83  *
  84  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  85  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  86  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  87  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  88  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  89  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  90  * PARTICULAR PURPOSE.
  91  *
  92  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  93  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  94  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  95  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  96  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  97  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  98  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  99  * LIMITED REMEDY.
 100  *
 101  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 102  * software or system incorporating such software without first obtaining any
 103  * required license or other approval from the U. S. Department of Commerce or
 104  * any other agency or department of the United States Government.  In the
 105  * event Licensee exports any such software from the United States or
 106  * re-exports any such software from a foreign destination, Licensee shall
 107  * ensure that the distribution and export/re-export of the software is in
 108  * compliance with all laws, regulations, orders, or other restrictions of the
 109  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 110  * any of its subsidiaries will export/re-export any technical data, process,
 111  * software, or service, directly or indirectly, to any country for which the
 112  * United States government or any agency thereof requires an export license,
 113  * other governmental approval, or letter of assurance, without first obtaining
 114  * such license, approval or letter.
 115  *
 116  *****************************************************************************/
 117
 118 #define __HWACPI_C__
 119
 120 #include "acpi.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 (enable/disable both zero)"));
 171         return_ACPI_STATUS (AE_OK);
 172     }
 173
 174     switch (Mode)
 175     {
 176     case ACPI_SYS_MODE_ACPI:
 177
 178         /* BIOS should have disabled ALL fixed and GP events */
 179
 180         Status = AcpiOsWritePort (AcpiGbl_FADT.SmiCommand,
 181                         (UINT32) AcpiGbl_FADT.AcpiEnable, 8);
 182         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
 183         break;
 184
 185     case ACPI_SYS_MODE_LEGACY:
 186
 187         /*
 188          * BIOS should clear all fixed status bits and restore fixed event
 189          * enable bits to default
 190          */
 191         Status = AcpiOsWritePort (AcpiGbl_FADT.SmiCommand,
 192                     (UINT32) AcpiGbl_FADT.AcpiDisable, 8);
 193         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 194                     "Attempting to enable Legacy (non-ACPI) mode\n"));
 195         break;
 196
 197     default:
 198         return_ACPI_STATUS (AE_BAD_PARAMETER);
 199     }
 200
 201     if (ACPI_FAILURE (Status))
 202     {
 203         ACPI_EXCEPTION ((AE_INFO, Status,
 204             "Could not write ACPI mode change"));
 205         return_ACPI_STATUS (Status);
 206     }
 207
 208     /*
 209      * Some hardware takes a LONG time to switch modes. Give them 3 sec to
 210      * do so, but allow faster systems to proceed more quickly.
 211      */
 212     Retry = 3000;
 213     while (Retry)
 214     {
 215         if (AcpiHwGetMode() == Mode)
 216         {
 217             ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n",
 218                 Mode));
 219             return_ACPI_STATUS (AE_OK);
 220         }
 221         AcpiOsStall(1000);
 222         Retry--;
 223     }
 224
 225     ACPI_ERROR ((AE_INFO, "Hardware did not change modes"));
 226     return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 227 }
 228
 229
 230 /*******************************************************************************
 231  *
 232  * FUNCTION:    AcpiHwGetMode
 233  *
 234  * PARAMETERS:  none
 235  *
 236  * RETURN:      SYS_MODE_ACPI or SYS_MODE_LEGACY
 237  *
 238  * DESCRIPTION: Return current operating state of system.  Determined by
 239  *              querying the SCI_EN bit.
 240  *
 241  ******************************************************************************/
 242
 243 UINT32
 244 AcpiHwGetMode (
 245     void)
 246 {
 247     ACPI_STATUS             Status;
 248     UINT32                  Value;
 249
 250
 251     ACPI_FUNCTION_TRACE (HwGetMode);
 252
 253
 254     /*
 255      * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
 256      * system does not support mode transition.
 257      */
 258     if (!AcpiGbl_FADT.SmiCommand)
 259     {
 260         return_UINT32 (ACPI_SYS_MODE_ACPI);
 261     }
 262
 263     Status = AcpiGetRegister (ACPI_BITREG_SCI_ENABLE, &Value);
 264     if (ACPI_FAILURE (Status))
 265     {
 266         return_UINT32 (ACPI_SYS_MODE_LEGACY);
 267     }
 268
 269     if (Value)
 270     {
 271         return_UINT32 (ACPI_SYS_MODE_ACPI);
 272     }
 273     else
 274     {
 275         return_UINT32 (ACPI_SYS_MODE_LEGACY);
 276     }
 277 }