drivers/acpi/events/evevent.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evevent - Fixed Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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/acpi.h>
  45 #include <acpi/acevents.h>
  46
  47 #define _COMPONENT          ACPI_EVENTS
  48          ACPI_MODULE_NAME    ("evevent")
  49
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ev_initialize_events
  54  *
  55  * PARAMETERS:  None
  56  *
  57  * RETURN:      Status
  58  *
  59  * DESCRIPTION: Initialize global data structures for events.
  60  *
  61  ******************************************************************************/
  62
  63 acpi_status
  64 acpi_ev_initialize_events (
  65         void)
  66 {
  67         acpi_status                     status;
  68
  69
  70         ACPI_FUNCTION_TRACE ("ev_initialize_events");
  71
  72
  73         /* Make sure we have ACPI tables */
  74
  75         if (!acpi_gbl_DSDT) {
  76                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No ACPI tables present!\n"));
  77                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
  78         }
  79
  80         /*
  81          * Initialize the Fixed and General Purpose Events. This is
  82          * done prior to enabling SCIs to prevent interrupts from
  83          * occurring before handers are installed.
  84          */
  85         status = acpi_ev_fixed_event_initialize ();
  86         if (ACPI_FAILURE (status)) {
  87                 ACPI_REPORT_ERROR ((
  88                                 "Unable to initialize fixed events, %s\n",
  89                                 acpi_format_exception (status)));
  90                 return_ACPI_STATUS (status);
  91         }
  92
  93         status = acpi_ev_gpe_initialize ();
  94         if (ACPI_FAILURE (status)) {
  95                 ACPI_REPORT_ERROR ((
  96                                 "Unable to initialize general purpose events, %s\n",
  97                                 acpi_format_exception (status)));
  98                 return_ACPI_STATUS (status);
  99         }
 100
 101         return_ACPI_STATUS (status);
 102 }
 103
 104
 105 /*******************************************************************************
 106  *
 107  * FUNCTION:    acpi_ev_install_xrupt_handlers
 108  *
 109  * PARAMETERS:  None
 110  *
 111  * RETURN:      Status
 112  *
 113  * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
 114  *
 115  ******************************************************************************/
 116
 117 acpi_status
 118 acpi_ev_install_xrupt_handlers (
 119         void)
 120 {
 121         acpi_status                     status;
 122
 123
 124         ACPI_FUNCTION_TRACE ("ev_install_xrupt_handlers");
 125
 126
 127         /* Install the SCI handler */
 128
 129         status = acpi_ev_install_sci_handler ();
 130         if (ACPI_FAILURE (status)) {
 131                 ACPI_REPORT_ERROR ((
 132                                 "Unable to install System Control Interrupt Handler, %s\n",
 133                                 acpi_format_exception (status)));
 134                 return_ACPI_STATUS (status);
 135         }
 136
 137         /* Install the handler for the Global Lock */
 138
 139         status = acpi_ev_init_global_lock_handler ();
 140         if (ACPI_FAILURE (status)) {
 141                 ACPI_REPORT_ERROR ((
 142                                 "Unable to initialize Global Lock handler, %s\n",
 143                                 acpi_format_exception (status)));
 144                 return_ACPI_STATUS (status);
 145         }
 146
 147         acpi_gbl_events_initialized = TRUE;
 148         return_ACPI_STATUS (status);
 149 }
 150
 151
 152 /*******************************************************************************
 153  *
 154  * FUNCTION:    acpi_ev_fixed_event_initialize
 155  *
 156  * PARAMETERS:  None
 157  *
 158  * RETURN:      Status
 159  *
 160  * DESCRIPTION: Install the fixed event handlers and enable the fixed events.
 161  *
 162  ******************************************************************************/
 163
 164 acpi_status
 165 acpi_ev_fixed_event_initialize (
 166         void)
 167 {
 168         acpi_native_uint                i;
 169         acpi_status                     status;
 170
 171
 172         /*
 173          * Initialize the structure that keeps track of fixed event handlers
 174          * and enable the fixed events.
 175          */
 176         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 177                 acpi_gbl_fixed_event_handlers[i].handler = NULL;
 178                 acpi_gbl_fixed_event_handlers[i].context = NULL;
 179
 180                 /* Enable the fixed event */
 181
 182                 if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
 183                         status = acpi_set_register (acpi_gbl_fixed_event_info[i].enable_register_id,
 184                                          0, ACPI_MTX_LOCK);
 185                         if (ACPI_FAILURE (status)) {
 186                                 return (status);
 187                         }
 188                 }
 189         }
 190
 191         return (AE_OK);
 192 }
 193
 194
 195 /*******************************************************************************
 196  *
 197  * FUNCTION:    acpi_ev_fixed_event_detect
 198  *
 199  * PARAMETERS:  None
 200  *
 201  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 202  *
 203  * DESCRIPTION: Checks the PM status register for fixed events
 204  *
 205  ******************************************************************************/
 206
 207 u32
 208 acpi_ev_fixed_event_detect (
 209         void)
 210 {
 211         u32                             int_status = ACPI_INTERRUPT_NOT_HANDLED;
 212         u32                             fixed_status;
 213         u32                             fixed_enable;
 214         acpi_native_uint                i;
 215
 216
 217         ACPI_FUNCTION_NAME ("ev_fixed_event_detect");
 218
 219
 220         /*
 221          * Read the fixed feature status and enable registers, as all the cases
 222          * depend on their values.  Ignore errors here.
 223          */
 224         (void) acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS, &fixed_status);
 225         (void) acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
 226
 227         ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
 228                 "Fixed Event Block: Enable %08X Status %08X\n",
 229                 fixed_enable, fixed_status));
 230
 231         /*
 232          * Check for all possible Fixed Events and dispatch those that are active
 233          */
 234         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 235                 /* Both the status and enable bits must be on for this event */
 236
 237                 if ((fixed_status & acpi_gbl_fixed_event_info[i].status_bit_mask) &&
 238                         (fixed_enable & acpi_gbl_fixed_event_info[i].enable_bit_mask)) {
 239                         /* Found an active (signalled) event */
 240
 241                         int_status |= acpi_ev_fixed_event_dispatch ((u32) i);
 242                 }
 243         }
 244
 245         return (int_status);
 246 }
 247
 248
 249 /*******************************************************************************
 250  *
 251  * FUNCTION:    acpi_ev_fixed_event_dispatch
 252  *
 253  * PARAMETERS:  Event               - Event type
 254  *
 255  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 256  *
 257  * DESCRIPTION: Clears the status bit for the requested event, calls the
 258  *              handler that previously registered for the event.
 259  *
 260  ******************************************************************************/
 261
 262 u32
 263 acpi_ev_fixed_event_dispatch (
 264         u32                             event)
 265 {
 266
 267
 268         ACPI_FUNCTION_ENTRY ();
 269
 270
 271         /* Clear the status bit */
 272
 273         (void) acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id,
 274                          1, ACPI_MTX_DO_NOT_LOCK);
 275
 276         /*
 277          * Make sure we've got a handler.  If not, report an error.
 278          * The event is disabled to prevent further interrupts.
 279          */
 280         if (NULL == acpi_gbl_fixed_event_handlers[event].handler) {
 281                 (void) acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
 282                                 0, ACPI_MTX_DO_NOT_LOCK);
 283
 284                 ACPI_REPORT_ERROR (
 285                         ("No installed handler for fixed event [%08X]\n",
 286                         event));
 287
 288                 return (ACPI_INTERRUPT_NOT_HANDLED);
 289         }
 290
 291         /* Invoke the Fixed Event handler */
 292
 293         return ((acpi_gbl_fixed_event_handlers[event].handler)(
 294                           acpi_gbl_fixed_event_handlers[event].context));
 295 }
 296
 297