drivers/acpi/acpica/evevent.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evevent - Fixed Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47
  48 #define _COMPONENT          ACPI_EVENTS
  49 ACPI_MODULE_NAME("evevent")
  50
  51 /* Local prototypes */
  52 static acpi_status acpi_ev_fixed_event_initialize(void);
  53
  54 static u32 acpi_ev_fixed_event_dispatch(u32 event);
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_ev_initialize_events
  59  *
  60  * PARAMETERS:  None
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status acpi_ev_initialize_events(void)
  69 {
  70         acpi_status status;
  71
  72         ACPI_FUNCTION_TRACE(ev_initialize_events);
  73
  74         /* If Hardware Reduced flag is set, there are no fixed events */
  75
  76         if (acpi_gbl_reduced_hardware) {
  77                 return_ACPI_STATUS(AE_OK);
  78         }
  79
  80         /*
  81          * Initialize the Fixed and General Purpose Events. This is done prior to
  82          * enabling SCIs to prevent interrupts from occurring before the handlers
  83          * are installed.
  84          */
  85         status = acpi_ev_fixed_event_initialize();
  86         if (ACPI_FAILURE(status)) {
  87                 ACPI_EXCEPTION((AE_INFO, status,
  88                                 "Unable to initialize fixed events"));
  89                 return_ACPI_STATUS(status);
  90         }
  91
  92         status = acpi_ev_gpe_initialize();
  93         if (ACPI_FAILURE(status)) {
  94                 ACPI_EXCEPTION((AE_INFO, status,
  95                                 "Unable to initialize general purpose events"));
  96                 return_ACPI_STATUS(status);
  97         }
  98
  99         return_ACPI_STATUS(status);
 100 }
 101
 102 /*******************************************************************************
 103  *
 104  * FUNCTION:    acpi_ev_install_xrupt_handlers
 105  *
 106  * PARAMETERS:  None
 107  *
 108  * RETURN:      Status
 109  *
 110  * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
 111  *
 112  ******************************************************************************/
 113
 114 acpi_status acpi_ev_install_xrupt_handlers(void)
 115 {
 116         acpi_status status;
 117
 118         ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
 119
 120         /* If Hardware Reduced flag is set, there is no ACPI h/w */
 121
 122         if (acpi_gbl_reduced_hardware) {
 123                 return_ACPI_STATUS(AE_OK);
 124         }
 125
 126         /* Install the SCI handler */
 127
 128         status = acpi_ev_install_sci_handler();
 129         if (ACPI_FAILURE(status)) {
 130                 ACPI_EXCEPTION((AE_INFO, status,
 131                                 "Unable to install System Control Interrupt handler"));
 132                 return_ACPI_STATUS(status);
 133         }
 134
 135         /* Install the handler for the Global Lock */
 136
 137         status = acpi_ev_init_global_lock_handler();
 138         if (ACPI_FAILURE(status)) {
 139                 ACPI_EXCEPTION((AE_INFO, status,
 140                                 "Unable to initialize Global Lock handler"));
 141                 return_ACPI_STATUS(status);
 142         }
 143
 144         acpi_gbl_events_initialized = TRUE;
 145         return_ACPI_STATUS(status);
 146 }
 147
 148 /*******************************************************************************
 149  *
 150  * FUNCTION:    acpi_ev_fixed_event_initialize
 151  *
 152  * PARAMETERS:  None
 153  *
 154  * RETURN:      Status
 155  *
 156  * DESCRIPTION: Install the fixed event handlers and disable all fixed events.
 157  *
 158  ******************************************************************************/
 159
 160 static acpi_status acpi_ev_fixed_event_initialize(void)
 161 {
 162         u32 i;
 163         acpi_status status;
 164
 165         /*
 166          * Initialize the structure that keeps track of fixed event handlers and
 167          * enable the fixed events.
 168          */
 169         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 170                 acpi_gbl_fixed_event_handlers[i].handler = NULL;
 171                 acpi_gbl_fixed_event_handlers[i].context = NULL;
 172
 173                 /* Disable the fixed event */
 174
 175                 if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
 176                         status =
 177                             acpi_write_bit_register(acpi_gbl_fixed_event_info
 178                                                     [i].enable_register_id,
 179                                                     ACPI_DISABLE_EVENT);
 180                         if (ACPI_FAILURE(status)) {
 181                                 return (status);
 182                         }
 183                 }
 184         }
 185
 186         return (AE_OK);
 187 }
 188
 189 /*******************************************************************************
 190  *
 191  * FUNCTION:    acpi_ev_fixed_event_detect
 192  *
 193  * PARAMETERS:  None
 194  *
 195  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 196  *
 197  * DESCRIPTION: Checks the PM status register for active fixed events
 198  *
 199  ******************************************************************************/
 200
 201 u32 acpi_ev_fixed_event_detect(void)
 202 {
 203         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 204         u32 fixed_status;
 205         u32 fixed_enable;
 206         u32 i;
 207
 208         ACPI_FUNCTION_NAME(ev_fixed_event_detect);
 209
 210         /*
 211          * Read the fixed feature status and enable registers, as all the cases
 212          * depend on their values. Ignore errors here.
 213          */
 214         (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
 215         (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
 216
 217         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 218                           "Fixed Event Block: Enable %08X Status %08X\n",
 219                           fixed_enable, fixed_status));
 220
 221         /*
 222          * Check for all possible Fixed Events and dispatch those that are active
 223          */
 224         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 225
 226                 /* Both the status and enable bits must be on for this event */
 227
 228                 if ((fixed_status & acpi_gbl_fixed_event_info[i].
 229                      status_bit_mask)
 230                     && (fixed_enable & acpi_gbl_fixed_event_info[i].
 231                         enable_bit_mask)) {
 232                         /*
 233                          * Found an active (signalled) event. Invoke global event
 234                          * handler if present.
 235                          */
 236                         acpi_fixed_event_count[i]++;
 237                         if (acpi_gbl_global_event_handler) {
 238                                 acpi_gbl_global_event_handler
 239                                     (ACPI_EVENT_TYPE_FIXED, NULL, i,
 240                                      acpi_gbl_global_event_handler_context);
 241                         }
 242
 243                         int_status |= acpi_ev_fixed_event_dispatch(i);
 244                 }
 245         }
 246
 247         return (int_status);
 248 }
 249
 250 /*******************************************************************************
 251  *
 252  * FUNCTION:    acpi_ev_fixed_event_dispatch
 253  *
 254  * PARAMETERS:  Event               - Event type
 255  *
 256  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 257  *
 258  * DESCRIPTION: Clears the status bit for the requested event, calls the
 259  *              handler that previously registered for the event.
 260  *
 261  ******************************************************************************/
 262
 263 static u32 acpi_ev_fixed_event_dispatch(u32 event)
 264 {
 265
 266         ACPI_FUNCTION_ENTRY();
 267
 268         /* Clear the status bit */
 269
 270         (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 271                                       status_register_id, ACPI_CLEAR_STATUS);
 272
 273         /*
 274          * Make sure we've got a handler. If not, report an error. The event is
 275          * disabled to prevent further interrupts.
 276          */
 277         if (NULL == acpi_gbl_fixed_event_handlers[event].handler) {
 278                 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 279                                               enable_register_id,
 280                                               ACPI_DISABLE_EVENT);
 281
 282                 ACPI_ERROR((AE_INFO,
 283                             "No installed handler for fixed event [0x%08X]",
 284                             event));
 285
 286                 return (ACPI_INTERRUPT_NOT_HANDLED);
 287         }
 288
 289         /* Invoke the Fixed Event handler */
 290
 291         return ((acpi_gbl_fixed_event_handlers[event].
 292                  handler) (acpi_gbl_fixed_event_handlers[event].context));
 293 }