drivers/acpica/hwacpi.c

0001
0002 /******************************************************************************
0003  *
0004  * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
0005  *
0006  *****************************************************************************/
0007
0008 /******************************************************************************
0009  *
0010  * 1. Copyright Notice
0011  *
0012  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
0013  * All rights reserved.
0014  *
0015  * 2. License
0016  *
0017  * 2.1. This is your license from Intel Corp. under its intellectual property
0018  * rights.  You may have additional license terms from the party that provided
0019  * you this software, covering your right to use that party's intellectual
0020  * property rights.
0021  *
0022  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
0023  * copy of the source code appearing in this file ("Covered Code") an
0024  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
0025  * base code distributed originally by Intel ("Original Intel Code") to copy,
0026  * make derivatives, distribute, use and display any portion of the Covered
0027  * Code in any form, with the right to sublicense such rights; and
0028  *
0029  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
0030  * license (with the right to sublicense), under only those claims of Intel
0031  * patents that are infringed by the Original Intel Code, to make, use, sell,
0032  * offer to sell, and import the Covered Code and derivative works thereof
0033  * solely to the minimum extent necessary to exercise the above copyright
0034  * license, and in no event shall the patent license extend to any additions
0035  * to or modifications of the Original Intel Code.  No other license or right
0036  * is granted directly or by implication, estoppel or otherwise;
0037  *
0038  * The above copyright and patent license is granted only if the following
0039  * conditions are met:
0040  *
0041  * 3. Conditions
0042  *
0043  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
0044  * Redistribution of source code of any substantial portion of the Covered
0045  * Code or modification with rights to further distribute source must include
0046  * the above Copyright Notice, the above License, this list of Conditions,
0047  * and the following Disclaimer and Export Compliance provision.  In addition,
0048  * Licensee must cause all Covered Code to which Licensee contributes to
0049  * contain a file documenting the changes Licensee made to create that Covered
0050  * Code and the date of any change.  Licensee must include in that file the
0051  * documentation of any changes made by any predecessor Licensee.  Licensee
0052  * must include a prominent statement that the modification is derived,
0053  * directly or indirectly, from Original Intel Code.
0054  *
0055  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
0056  * Redistribution of source code of any substantial portion of the Covered
0057  * Code or modification without rights to further distribute source must
0058  * include the following Disclaimer and Export Compliance provision in the
0059  * documentation and/or other materials provided with distribution.  In
0060  * addition, Licensee may not authorize further sublicense of source of any
0061  * portion of the Covered Code, and must include terms to the effect that the
0062  * license from Licensee to its licensee is limited to the intellectual
0063  * property embodied in the software Licensee provides to its licensee, and
0064  * not to intellectual property embodied in modifications its licensee may
0065  * make.
0066  *
0067  * 3.3. Redistribution of Executable. Redistribution in executable form of any
0068  * substantial portion of the Covered Code or modification must reproduce the
0069  * above Copyright Notice, and the following Disclaimer and Export Compliance
0070  * provision in the documentation and/or other materials provided with the
0071  * distribution.
0072  *
0073  * 3.4. Intel retains all right, title, and interest in and to the Original
0074  * Intel Code.
0075  *
0076  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
0077  * Intel shall be used in advertising or otherwise to promote the sale, use or
0078  * other dealings in products derived from or relating to the Covered Code
0079  * without prior written authorization from Intel.
0080  *
0081  * 4. Disclaimer and Export Compliance
0082  *
0083  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
0084  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
0085  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
0086  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
0087  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
0088  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
0089  * PARTICULAR PURPOSE.
0090  *
0091  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
0092  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
0093  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
0094  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
0095  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
0096  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
0097  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
0098  * LIMITED REMEDY.
0099  *
0100  * 4.3. Licensee shall not export, either directly or indirectly, any of this
0101  * software or system incorporating such software without first obtaining any
0102  * required license or other approval from the U. S. Department of Commerce or
0103  * any other agency or department of the United States Government.  In the
0104  * event Licensee exports any such software from the United States or
0105  * re-exports any such software from a foreign destination, Licensee shall
0106  * ensure that the distribution and export/re-export of the software is in
0107  * compliance with all laws, regulations, orders, or other restrictions of the
0108  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
0109  * any of its subsidiaries will export/re-export any technical data, process,
0110  * software, or service, directly or indirectly, to any country for which the
0111  * United States government or any agency thereof requires an export license,
0112  * other governmental approval, or letter of assurance, without first obtaining
0113  * such license, approval or letter.
0114  *
0115  *****************************************************************************/
0116
0117 #define __HWACPI_C__
0118
0119 #include "acpi.h"
0120 #include "accommon.h"
0121
0122
0123 #define _COMPONENT          ACPI_HARDWARE
0124         ACPI_MODULE_NAME    ("hwacpi")
0125
0126
0127 /******************************************************************************
0128  *
0129  * FUNCTION:    AcpiHwSetMode
0130  *
0131  * PARAMETERS:  Mode            - SYS_MODE_ACPI or SYS_MODE_LEGACY
0132  *
0133  * RETURN:      Status
0134  *
0135  * DESCRIPTION: Transitions the system into the requested mode.
0136  *
0137  ******************************************************************************/
0138
0139 ACPI_STATUS
0140 AcpiHwSetMode (
0141     UINT32                  Mode)
0142 {
0143
0144     ACPI_STATUS             Status;
0145     UINT32                  Retry;
0146
0147
0148     ACPI_FUNCTION_TRACE (HwSetMode);
0149
0150     /*
0151      * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
0152      * system does not support mode transition.
0153      */
0154     if (!AcpiGbl_FADT.SmiCommand)
0155     {
0156         ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed"));
0157         return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
0158     }
0159
0160     /*
0161      * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
0162      * in FADT: If it is zero, enabling or disabling is not supported.
0163      * As old systems may have used zero for mode transition,
0164      * we make sure both the numbers are zero to determine these
0165      * transitions are not supported.
0166      */
0167     if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable)
0168     {
0169         ACPI_ERROR ((AE_INFO,
0170             "No ACPI mode transition supported in this system "
0171             "(enable/disable both zero)"));
0172         return_ACPI_STATUS (AE_OK);
0173     }
0174
0175     switch (Mode)
0176     {
0177     case ACPI_SYS_MODE_ACPI:
0178
0179         /* BIOS should have disabled ALL fixed and GP events */
0180
0181         Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
0182                         (UINT32) AcpiGbl_FADT.AcpiEnable, 8);
0183         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
0184         break;
0185
0186     case ACPI_SYS_MODE_LEGACY:
0187
0188         /*
0189          * BIOS should clear all fixed status bits and restore fixed event
0190          * enable bits to default
0191          */
0192         Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
0193                     (UINT32) AcpiGbl_FADT.AcpiDisable, 8);
0194         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
0195                     "Attempting to enable Legacy (non-ACPI) mode\n"));
0196         break;
0197
0198     default:
0199         return_ACPI_STATUS (AE_BAD_PARAMETER);
0200     }
0201
0202     if (ACPI_FAILURE (Status))
0203     {
0204         ACPI_EXCEPTION ((AE_INFO, Status,
0205             "Could not write ACPI mode change"));
0206         return_ACPI_STATUS (Status);
0207     }
0208
0209     /*
0210      * Some hardware takes a LONG time to switch modes. Give them 3 sec to
0211      * do so, but allow faster systems to proceed more quickly.
0212      */
0213     Retry = 3000;
0214     while (Retry)
0215     {
0216         if (AcpiHwGetMode() == Mode)
0217         {
0218             ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n",
0219                 Mode));
0220             return_ACPI_STATUS (AE_OK);
0221         }
0222         AcpiOsStall(1000);
0223         Retry--;
0224     }
0225
0226     ACPI_ERROR ((AE_INFO, "Hardware did not change modes"));
0227     return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
0228 }
0229
0230
0231 /*******************************************************************************
0232  *
0233  * FUNCTION:    AcpiHwGetMode
0234  *
0235  * PARAMETERS:  none
0236  *
0237  * RETURN:      SYS_MODE_ACPI or SYS_MODE_LEGACY
0238  *
0239  * DESCRIPTION: Return current operating state of system.  Determined by
0240  *              querying the SCI_EN bit.
0241  *
0242  ******************************************************************************/
0243
0244 UINT32
0245 AcpiHwGetMode (
0246     void)
0247 {
0248     ACPI_STATUS             Status;
0249     UINT32                  Value;
0250
0251
0252     ACPI_FUNCTION_TRACE (HwGetMode);
0253
0254
0255     /*
0256      * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
0257      * system does not support mode transition.
0258      */
0259     if (!AcpiGbl_FADT.SmiCommand)
0260     {
0261         return_UINT32 (ACPI_SYS_MODE_ACPI);
0262     }
0263
0264     Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value);
0265     if (ACPI_FAILURE (Status))
0266     {
0267         return_UINT32 (ACPI_SYS_MODE_LEGACY);
0268     }
0269
0270     if (Value)
0271     {
0272         return_UINT32 (ACPI_SYS_MODE_ACPI);
0273     }
0274     else
0275     {
0276         return_UINT32 (ACPI_SYS_MODE_LEGACY);
0277     }
0278 }