drivers/bus/acpi/acpica/events/evevent.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evevent - Fixed Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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 #include "acevents.h"
  47
  48 #define _COMPONENT          ACPI_EVENTS
  49         ACPI_MODULE_NAME    ("evevent")
  50
  51 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  52
  53 /* Local prototypes */
  54
  55 static ACPI_STATUS
  56 AcpiEvFixedEventInitialize (
  57     void);
  58
  59 static UINT32
  60 AcpiEvFixedEventDispatch (
  61     UINT32                  Event);
  62
  63
  64 /*******************************************************************************
  65  *
  66  * FUNCTION:    AcpiEvInitializeEvents
  67  *
  68  * PARAMETERS:  None
  69  *
  70  * RETURN:      Status
  71  *
  72  * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
  73  *
  74  ******************************************************************************/
  75
  76 ACPI_STATUS
  77 AcpiEvInitializeEvents (
  78     void)
  79 {
  80     ACPI_STATUS             Status;
  81
  82
  83     ACPI_FUNCTION_TRACE (EvInitializeEvents);
  84
  85
  86     /* If Hardware Reduced flag is set, there are no fixed events */
  87
  88     if (AcpiGbl_ReducedHardware)
  89     {
  90         return_ACPI_STATUS (AE_OK);
  91     }
  92
  93     /*
  94      * Initialize the Fixed and General Purpose Events. This is done prior to
  95      * enabling SCIs to prevent interrupts from occurring before the handlers
  96      * are installed.
  97      */
  98     Status = AcpiEvFixedEventInitialize ();
  99     if (ACPI_FAILURE (Status))
 100     {
 101         ACPI_EXCEPTION ((AE_INFO, Status,
 102             "Unable to initialize fixed events"));
 103         return_ACPI_STATUS (Status);
 104     }
 105
 106     Status = AcpiEvGpeInitialize ();
 107     if (ACPI_FAILURE (Status))
 108     {
 109         ACPI_EXCEPTION ((AE_INFO, Status,
 110             "Unable to initialize general purpose events"));
 111         return_ACPI_STATUS (Status);
 112     }
 113
 114     return_ACPI_STATUS (Status);
 115 }
 116
 117
 118 /*******************************************************************************
 119  *
 120  * FUNCTION:    AcpiEvInstallXruptHandlers
 121  *
 122  * PARAMETERS:  None
 123  *
 124  * RETURN:      Status
 125  *
 126  * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
 127  *
 128  ******************************************************************************/
 129
 130 ACPI_STATUS
 131 AcpiEvInstallXruptHandlers (
 132     void)
 133 {
 134     ACPI_STATUS             Status;
 135
 136
 137     ACPI_FUNCTION_TRACE (EvInstallXruptHandlers);
 138
 139
 140     /* If Hardware Reduced flag is set, there is no ACPI h/w */
 141
 142     if (AcpiGbl_ReducedHardware)
 143     {
 144         return_ACPI_STATUS (AE_OK);
 145     }
 146
 147     /* Install the SCI handler */
 148
 149     Status = AcpiEvInstallSciHandler ();
 150     if (ACPI_FAILURE (Status))
 151     {
 152         ACPI_EXCEPTION ((AE_INFO, Status,
 153             "Unable to install System Control Interrupt handler"));
 154         return_ACPI_STATUS (Status);
 155     }
 156
 157     /* Install the handler for the Global Lock */
 158
 159     Status = AcpiEvInitGlobalLockHandler ();
 160     if (ACPI_FAILURE (Status))
 161     {
 162         ACPI_EXCEPTION ((AE_INFO, Status,
 163             "Unable to initialize Global Lock handler"));
 164         return_ACPI_STATUS (Status);
 165     }
 166
 167     AcpiGbl_EventsInitialized = TRUE;
 168     return_ACPI_STATUS (Status);
 169 }
 170
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    AcpiEvFixedEventInitialize
 175  *
 176  * PARAMETERS:  None
 177  *
 178  * RETURN:      Status
 179  *
 180  * DESCRIPTION: Install the fixed event handlers and disable all fixed events.
 181  *
 182  ******************************************************************************/
 183
 184 static ACPI_STATUS
 185 AcpiEvFixedEventInitialize (
 186     void)
 187 {
 188     UINT32                  i;
 189     ACPI_STATUS             Status;
 190
 191
 192     /*
 193      * Initialize the structure that keeps track of fixed event handlers and
 194      * enable the fixed events.
 195      */
 196     for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++)
 197     {
 198         AcpiGbl_FixedEventHandlers[i].Handler = NULL;
 199         AcpiGbl_FixedEventHandlers[i].Context = NULL;
 200
 201         /* Disable the fixed event */
 202
 203         if (AcpiGbl_FixedEventInfo[i].EnableRegisterId != 0xFF)
 204         {
 205             Status = AcpiWriteBitRegister (
 206                 AcpiGbl_FixedEventInfo[i].EnableRegisterId,
 207                 ACPI_DISABLE_EVENT);
 208             if (ACPI_FAILURE (Status))
 209             {
 210                 return (Status);
 211             }
 212         }
 213     }
 214
 215     return (AE_OK);
 216 }
 217
 218
 219 /*******************************************************************************
 220  *
 221  * FUNCTION:    AcpiEvFixedEventDetect
 222  *
 223  * PARAMETERS:  None
 224  *
 225  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 226  *
 227  * DESCRIPTION: Checks the PM status register for active fixed events
 228  *
 229  ******************************************************************************/
 230
 231 UINT32
 232 AcpiEvFixedEventDetect (
 233     void)
 234 {
 235     UINT32                  IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
 236     UINT32                  FixedStatus;
 237     UINT32                  FixedEnable;
 238     UINT32                  i;
 239     ACPI_STATUS             Status;
 240
 241
 242     ACPI_FUNCTION_NAME (EvFixedEventDetect);
 243
 244
 245     /*
 246      * Read the fixed feature status and enable registers, as all the cases
 247      * depend on their values. Ignore errors here.
 248      */
 249     Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_STATUS, &FixedStatus);
 250     Status |= AcpiHwRegisterRead (ACPI_REGISTER_PM1_ENABLE, &FixedEnable);
 251     if (ACPI_FAILURE (Status))
 252     {
 253         return (IntStatus);
 254     }
 255
 256     ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
 257         "Fixed Event Block: Enable %08X Status %08X\n",
 258         FixedEnable, FixedStatus));
 259
 260     /*
 261      * Check for all possible Fixed Events and dispatch those that are active
 262      */
 263     for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++)
 264     {
 265         /* Both the status and enable bits must be on for this event */
 266
 267         if ((FixedStatus & AcpiGbl_FixedEventInfo[i].StatusBitMask) &&
 268             (FixedEnable & AcpiGbl_FixedEventInfo[i].EnableBitMask))
 269         {
 270             /*
 271              * Found an active (signalled) event. Invoke global event
 272              * handler if present.
 273              */
 274             AcpiFixedEventCount[i]++;
 275             if (AcpiGbl_GlobalEventHandler)
 276             {
 277                 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_FIXED, NULL,
 278                      i, AcpiGbl_GlobalEventHandlerContext);
 279             }
 280
 281             IntStatus |= AcpiEvFixedEventDispatch (i);
 282         }
 283     }
 284
 285     return (IntStatus);
 286 }
 287
 288
 289 /*******************************************************************************
 290  *
 291  * FUNCTION:    AcpiEvFixedEventDispatch
 292  *
 293  * PARAMETERS:  Event               - Event type
 294  *
 295  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 296  *
 297  * DESCRIPTION: Clears the status bit for the requested event, calls the
 298  *              handler that previously registered for the event.
 299  *              NOTE: If there is no handler for the event, the event is
 300  *              disabled to prevent further interrupts.
 301  *
 302  ******************************************************************************/
 303
 304 static UINT32
 305 AcpiEvFixedEventDispatch (
 306     UINT32                  Event)
 307 {
 308
 309     ACPI_FUNCTION_ENTRY ();
 310
 311
 312     /* Clear the status bit */
 313
 314     (void) AcpiWriteBitRegister (
 315         AcpiGbl_FixedEventInfo[Event].StatusRegisterId,
 316         ACPI_CLEAR_STATUS);
 317
 318     /*
 319      * Make sure that a handler exists. If not, report an error
 320      * and disable the event to prevent further interrupts.
 321      */
 322     if (!AcpiGbl_FixedEventHandlers[Event].Handler)
 323     {
 324         (void) AcpiWriteBitRegister (
 325             AcpiGbl_FixedEventInfo[Event].EnableRegisterId,
 326             ACPI_DISABLE_EVENT);
 327
 328         ACPI_ERROR ((AE_INFO,
 329             "No installed handler for fixed event - %s (%u), disabling",
 330             AcpiUtGetEventName (Event), Event));
 331
 332         return (ACPI_INTERRUPT_NOT_HANDLED);
 333     }
 334
 335     /* Invoke the Fixed Event handler */
 336
 337     return ((AcpiGbl_FixedEventHandlers[Event].Handler)(
 338         AcpiGbl_FixedEventHandlers[Event].Context));
 339 }
 340
 341 #endif /* !ACPI_REDUCED_HARDWARE */