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

   1 /*******************************************************************************
   2  *
   3  * Module Name: evsci - System Control Interrupt configuration and
   4  *                      legacy to ACPI mode state transition functions
   5  *
   6  ******************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2017, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include "acpi.h"
  46 #include "accommon.h"
  47 #include "acevents.h"
  48
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51         ACPI_MODULE_NAME    ("evsci")
  52
  53 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  54
  55 /* Local prototypes */
  56
  57 static UINT32 ACPI_SYSTEM_XFACE
  58 AcpiEvSciXruptHandler (
  59     void                    *Context);
  60
  61
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    AcpiEvSciDispatch
  65  *
  66  * PARAMETERS:  None
  67  *
  68  * RETURN:      Status code indicates whether interrupt was handled.
  69  *
  70  * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
  71  *
  72  ******************************************************************************/
  73
  74 UINT32
  75 AcpiEvSciDispatch (
  76     void)
  77 {
  78     ACPI_SCI_HANDLER_INFO   *SciHandler;
  79     ACPI_CPU_FLAGS          Flags;
  80     UINT32                  IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
  81
  82
  83     ACPI_FUNCTION_NAME (EvSciDispatch);
  84
  85
  86     /* Are there any host-installed SCI handlers? */
  87
  88     if (!AcpiGbl_SciHandlerList)
  89     {
  90         return (IntStatus);
  91     }
  92
  93     Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
  94
  95     /* Invoke all host-installed SCI handlers */
  96
  97     SciHandler = AcpiGbl_SciHandlerList;
  98     while (SciHandler)
  99     {
 100         /* Invoke the installed handler (at interrupt level) */
 101
 102         IntStatus |= SciHandler->Address (
 103             SciHandler->Context);
 104
 105         SciHandler = SciHandler->Next;
 106     }
 107
 108     AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
 109     return (IntStatus);
 110 }
 111
 112
 113 /*******************************************************************************
 114  *
 115  * FUNCTION:    AcpiEvSciXruptHandler
 116  *
 117  * PARAMETERS:  Context   - Calling Context
 118  *
 119  * RETURN:      Status code indicates whether interrupt was handled.
 120  *
 121  * DESCRIPTION: Interrupt handler that will figure out what function or
 122  *              control method to call to deal with a SCI.
 123  *
 124  ******************************************************************************/
 125
 126 static UINT32 ACPI_SYSTEM_XFACE
 127 AcpiEvSciXruptHandler (
 128     void                    *Context)
 129 {
 130     ACPI_GPE_XRUPT_INFO     *GpeXruptList = Context;
 131     UINT32                  InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
 132
 133
 134     ACPI_FUNCTION_TRACE (EvSciXruptHandler);
 135
 136
 137     /*
 138      * We are guaranteed by the ACPICA initialization/shutdown code that
 139      * if this interrupt handler is installed, ACPI is enabled.
 140      */
 141
 142     /*
 143      * Fixed Events:
 144      * Check for and dispatch any Fixed Events that have occurred
 145      */
 146     InterruptHandled |= AcpiEvFixedEventDetect ();
 147
 148     /*
 149      * General Purpose Events:
 150      * Check for and dispatch any GPEs that have occurred
 151      */
 152     InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
 153
 154     /* Invoke all host-installed SCI handlers */
 155
 156     InterruptHandled |= AcpiEvSciDispatch ();
 157
 158     AcpiSciCount++;
 159     return_UINT32 (InterruptHandled);
 160 }
 161
 162
 163 /*******************************************************************************
 164  *
 165  * FUNCTION:    AcpiEvGpeXruptHandler
 166  *
 167  * PARAMETERS:  Context   - Calling Context
 168  *
 169  * RETURN:      Status code indicates whether interrupt was handled.
 170  *
 171  * DESCRIPTION: Handler for GPE Block Device interrupts
 172  *
 173  ******************************************************************************/
 174
 175 UINT32 ACPI_SYSTEM_XFACE
 176 AcpiEvGpeXruptHandler (
 177     void                    *Context)
 178 {
 179     ACPI_GPE_XRUPT_INFO     *GpeXruptList = Context;
 180     UINT32                  InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
 181
 182
 183     ACPI_FUNCTION_TRACE (EvGpeXruptHandler);
 184
 185
 186     /*
 187      * We are guaranteed by the ACPICA initialization/shutdown code that
 188      * if this interrupt handler is installed, ACPI is enabled.
 189      */
 190
 191     /* GPEs: Check for and dispatch any GPEs that have occurred */
 192
 193     InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
 194     return_UINT32 (InterruptHandled);
 195 }
 196
 197
 198 /******************************************************************************
 199  *
 200  * FUNCTION:    AcpiEvInstallSciHandler
 201  *
 202  * PARAMETERS:  none
 203  *
 204  * RETURN:      Status
 205  *
 206  * DESCRIPTION: Installs SCI handler.
 207  *
 208  ******************************************************************************/
 209
 210 UINT32
 211 AcpiEvInstallSciHandler (
 212     void)
 213 {
 214     UINT32                  Status = AE_OK;
 215
 216
 217     ACPI_FUNCTION_TRACE (EvInstallSciHandler);
 218
 219
 220     Status = AcpiOsInstallInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
 221         AcpiEvSciXruptHandler, AcpiGbl_GpeXruptListHead);
 222     return_ACPI_STATUS (Status);
 223 }
 224
 225
 226 /******************************************************************************
 227  *
 228  * FUNCTION:    AcpiEvRemoveAllSciHandlers
 229  *
 230  * PARAMETERS:  none
 231  *
 232  * RETURN:      AE_OK if handler uninstalled, AE_ERROR if handler was not
 233  *              installed to begin with
 234  *
 235  * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
 236  *              taken. Remove all host-installed SCI handlers.
 237  *
 238  * Note:  It doesn't seem important to disable all events or set the event
 239  *        enable registers to their original values. The OS should disable
 240  *        the SCI interrupt level when the handler is removed, so no more
 241  *        events will come in.
 242  *
 243  ******************************************************************************/
 244
 245 ACPI_STATUS
 246 AcpiEvRemoveAllSciHandlers (
 247     void)
 248 {
 249     ACPI_SCI_HANDLER_INFO   *SciHandler;
 250     ACPI_CPU_FLAGS          Flags;
 251     ACPI_STATUS             Status;
 252
 253
 254     ACPI_FUNCTION_TRACE (EvRemoveAllSciHandlers);
 255
 256
 257     /* Just let the OS remove the handler and disable the level */
 258
 259     Status = AcpiOsRemoveInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
 260         AcpiEvSciXruptHandler);
 261
 262     if (!AcpiGbl_SciHandlerList)
 263     {
 264         return (Status);
 265     }
 266
 267     Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
 268
 269     /* Free all host-installed SCI handlers */
 270
 271     while (AcpiGbl_SciHandlerList)
 272     {
 273         SciHandler = AcpiGbl_SciHandlerList;
 274         AcpiGbl_SciHandlerList = SciHandler->Next;
 275         ACPI_FREE (SciHandler);
 276     }
 277
 278     AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
 279     return_ACPI_STATUS (Status);
 280 }
 281
 282 #endif /* !ACPI_REDUCED_HARDWARE */