reactos/drivers/bus/acpi/acpica/hardware/hwacpi.c

   1 /******************************************************************************
   2  *
   3  * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include "acpi.h"
  45 #include "accommon.h"
  46
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49         ACPI_MODULE_NAME    ("hwacpi")
  50
  51
  52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  53 /******************************************************************************
  54  *
  55  * FUNCTION:    AcpiHwSetMode
  56  *
  57  * PARAMETERS:  Mode            - SYS_MODE_ACPI or SYS_MODE_LEGACY
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Transitions the system into the requested mode.
  62  *
  63  ******************************************************************************/
  64
  65 ACPI_STATUS
  66 AcpiHwSetMode (
  67     UINT32                  Mode)
  68 {
  69
  70     ACPI_STATUS             Status;
  71     UINT32                  Retry;
  72
  73
  74     ACPI_FUNCTION_TRACE (HwSetMode);
  75
  76
  77     /* If the Hardware Reduced flag is set, machine is always in acpi mode */
  78
  79     if (AcpiGbl_ReducedHardware)
  80     {
  81         return_ACPI_STATUS (AE_OK);
  82     }
  83
  84     /*
  85      * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
  86      * system does not support mode transition.
  87      */
  88     if (!AcpiGbl_FADT.SmiCommand)
  89     {
  90         ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed"));
  91         return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
  92     }
  93
  94     /*
  95      * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
  96      * in FADT: If it is zero, enabling or disabling is not supported.
  97      * As old systems may have used zero for mode transition,
  98      * we make sure both the numbers are zero to determine these
  99      * transitions are not supported.
 100      */
 101     if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable)
 102     {
 103         ACPI_ERROR ((AE_INFO,
 104             "No ACPI mode transition supported in this system "
 105             "(enable/disable both zero)"));
 106         return_ACPI_STATUS (AE_OK);
 107     }
 108
 109     switch (Mode)
 110     {
 111     case ACPI_SYS_MODE_ACPI:
 112
 113         /* BIOS should have disabled ALL fixed and GP events */
 114
 115         Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
 116             (UINT32) AcpiGbl_FADT.AcpiEnable, 8);
 117         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
 118         break;
 119
 120     case ACPI_SYS_MODE_LEGACY:
 121         /*
 122          * BIOS should clear all fixed status bits and restore fixed event
 123          * enable bits to default
 124          */
 125         Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
 126             (UINT32) AcpiGbl_FADT.AcpiDisable, 8);
 127         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 128             "Attempting to enable Legacy (non-ACPI) mode\n"));
 129         break;
 130
 131     default:
 132
 133         return_ACPI_STATUS (AE_BAD_PARAMETER);
 134     }
 135
 136     if (ACPI_FAILURE (Status))
 137     {
 138         ACPI_EXCEPTION ((AE_INFO, Status,
 139             "Could not write ACPI mode change"));
 140         return_ACPI_STATUS (Status);
 141     }
 142
 143     /*
 144      * Some hardware takes a LONG time to switch modes. Give them 3 sec to
 145      * do so, but allow faster systems to proceed more quickly.
 146      */
 147     Retry = 3000;
 148     while (Retry)
 149     {
 150         if (AcpiHwGetMode () == Mode)
 151         {
 152             ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 153                 "Mode %X successfully enabled\n", Mode));
 154             return_ACPI_STATUS (AE_OK);
 155         }
 156         AcpiOsStall (ACPI_USEC_PER_MSEC);
 157         Retry--;
 158     }
 159
 160     ACPI_ERROR ((AE_INFO, "Hardware did not change modes"));
 161     return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
 162 }
 163
 164
 165 /*******************************************************************************
 166  *
 167  * FUNCTION:    AcpiHwGetMode
 168  *
 169  * PARAMETERS:  none
 170  *
 171  * RETURN:      SYS_MODE_ACPI or SYS_MODE_LEGACY
 172  *
 173  * DESCRIPTION: Return current operating state of system. Determined by
 174  *              querying the SCI_EN bit.
 175  *
 176  ******************************************************************************/
 177
 178 UINT32
 179 AcpiHwGetMode (
 180     void)
 181 {
 182     ACPI_STATUS             Status;
 183     UINT32                  Value;
 184
 185
 186     ACPI_FUNCTION_TRACE (HwGetMode);
 187
 188
 189     /* If the Hardware Reduced flag is set, machine is always in acpi mode */
 190
 191     if (AcpiGbl_ReducedHardware)
 192     {
 193         return_UINT32 (ACPI_SYS_MODE_ACPI);
 194     }
 195
 196     /*
 197      * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
 198      * system does not support mode transition.
 199      */
 200     if (!AcpiGbl_FADT.SmiCommand)
 201     {
 202         return_UINT32 (ACPI_SYS_MODE_ACPI);
 203     }
 204
 205     Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value);
 206     if (ACPI_FAILURE (Status))
 207     {
 208         return_UINT32 (ACPI_SYS_MODE_LEGACY);
 209     }
 210
 211     if (Value)
 212     {
 213         return_UINT32 (ACPI_SYS_MODE_ACPI);
 214     }
 215     else
 216     {
 217         return_UINT32 (ACPI_SYS_MODE_LEGACY);
 218     }
 219 }
 220
 221 #endif /* !ACPI_REDUCED_HARDWARE */