release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/evevent.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evevent - Fixed Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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         /*
  75          * Initialize the Fixed and General Purpose Events. This is done prior to
  76          * enabling SCIs to prevent interrupts from occurring before the handlers
  77          * are installed.
  78          */
  79         status = acpi_ev_fixed_event_initialize();
  80         if (ACPI_FAILURE(status)) {
  81                 ACPI_EXCEPTION((AE_INFO, status,
  82                                 "Unable to initialize fixed events"));
  83                 return_ACPI_STATUS(status);
  84         }
  85
  86         status = acpi_ev_gpe_initialize();
  87         if (ACPI_FAILURE(status)) {
  88                 ACPI_EXCEPTION((AE_INFO, status,
  89                                 "Unable to initialize general purpose events"));
  90                 return_ACPI_STATUS(status);
  91         }
  92
  93         return_ACPI_STATUS(status);
  94 }
  95
  96 /*******************************************************************************
  97  *
  98  * FUNCTION:    acpi_ev_install_fadt_gpes
  99  *
 100  * PARAMETERS:  None
 101  *
 102  * RETURN:      Status
 103  *
 104  * DESCRIPTION: Completes initialization of the FADT-defined GPE blocks
 105  *              (0 and 1). The HW must be fully initialized at this point,
 106  *              including global lock support.
 107  *
 108  ******************************************************************************/
 109
 110 acpi_status acpi_ev_install_fadt_gpes(void)
 111 {
 112         acpi_status status;
 113
 114         ACPI_FUNCTION_TRACE(ev_install_fadt_gpes);
 115
 116         /* Namespace must be locked */
 117
 118         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 119         if (ACPI_FAILURE(status)) {
 120                 return (status);
 121         }
 122
 123         /* FADT GPE Block 0 */
 124
 125         (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
 126                                            acpi_gbl_gpe_fadt_blocks[0]);
 127
 128         /* FADT GPE Block 1 */
 129
 130         (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
 131                                            acpi_gbl_gpe_fadt_blocks[1]);
 132
 133         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 134         return_ACPI_STATUS(AE_OK);
 135 }
 136
 137 /*******************************************************************************
 138  *
 139  * FUNCTION:    acpi_ev_install_xrupt_handlers
 140  *
 141  * PARAMETERS:  None
 142  *
 143  * RETURN:      Status
 144  *
 145  * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
 146  *
 147  ******************************************************************************/
 148
 149 acpi_status acpi_ev_install_xrupt_handlers(void)
 150 {
 151         acpi_status status;
 152
 153         ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
 154
 155         /* Install the SCI handler */
 156
 157         status = acpi_ev_install_sci_handler();
 158         if (ACPI_FAILURE(status)) {
 159                 ACPI_EXCEPTION((AE_INFO, status,
 160                                 "Unable to install System Control Interrupt handler"));
 161                 return_ACPI_STATUS(status);
 162         }
 163
 164         /* Install the handler for the Global Lock */
 165
 166         status = acpi_ev_init_global_lock_handler();
 167         if (ACPI_FAILURE(status)) {
 168                 ACPI_EXCEPTION((AE_INFO, status,
 169                                 "Unable to initialize Global Lock handler"));
 170                 return_ACPI_STATUS(status);
 171         }
 172
 173         acpi_gbl_events_initialized = TRUE;
 174         return_ACPI_STATUS(status);
 175 }
 176
 177 /*******************************************************************************
 178  *
 179  * FUNCTION:    acpi_ev_fixed_event_initialize
 180  *
 181  * PARAMETERS:  None
 182  *
 183  * RETURN:      Status
 184  *
 185  * DESCRIPTION: Install the fixed event handlers and disable all fixed events.
 186  *
 187  ******************************************************************************/
 188
 189 static acpi_status acpi_ev_fixed_event_initialize(void)
 190 {
 191         u32 i;
 192         acpi_status status;
 193
 194         /*
 195          * Initialize the structure that keeps track of fixed event handlers and
 196          * enable the fixed events.
 197          */
 198         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 199                 acpi_gbl_fixed_event_handlers[i].handler = NULL;
 200                 acpi_gbl_fixed_event_handlers[i].context = NULL;
 201
 202                 /* Disable the fixed event */
 203
 204                 if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
 205                         status =
 206                             acpi_write_bit_register(acpi_gbl_fixed_event_info
 207                                                     [i].enable_register_id,
 208                                                     ACPI_DISABLE_EVENT);
 209                         if (ACPI_FAILURE(status)) {
 210                                 return (status);
 211                         }
 212                 }
 213         }
 214
 215         return (AE_OK);
 216 }
 217
 218 /*******************************************************************************
 219  *
 220  * FUNCTION:    acpi_ev_fixed_event_detect
 221  *
 222  * PARAMETERS:  None
 223  *
 224  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 225  *
 226  * DESCRIPTION: Checks the PM status register for active fixed events
 227  *
 228  ******************************************************************************/
 229
 230 u32 acpi_ev_fixed_event_detect(void)
 231 {
 232         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 233         u32 fixed_status;
 234         u32 fixed_enable;
 235         u32 i;
 236
 237         ACPI_FUNCTION_NAME(ev_fixed_event_detect);
 238
 239         /*
 240          * Read the fixed feature status and enable registers, as all the cases
 241          * depend on their values. Ignore errors here.
 242          */
 243         (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
 244         (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
 245
 246         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 247                           "Fixed Event Block: Enable %08X Status %08X\n",
 248                           fixed_enable, fixed_status));
 249
 250         /*
 251          * Check for all possible Fixed Events and dispatch those that are active
 252          */
 253         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 254
 255                 /* Both the status and enable bits must be on for this event */
 256
 257                 if ((fixed_status & acpi_gbl_fixed_event_info[i].
 258                      status_bit_mask)
 259                     && (fixed_enable & acpi_gbl_fixed_event_info[i].
 260                         enable_bit_mask)) {
 261
 262                         /* Found an active (signalled) event */
 263                         acpi_os_fixed_event_count(i);
 264                         int_status |= acpi_ev_fixed_event_dispatch(i);
 265                 }
 266         }
 267
 268         return (int_status);
 269 }
 270
 271 /*******************************************************************************
 272  *
 273  * FUNCTION:    acpi_ev_fixed_event_dispatch
 274  *
 275  * PARAMETERS:  Event               - Event type
 276  *
 277  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 278  *
 279  * DESCRIPTION: Clears the status bit for the requested event, calls the
 280  *              handler that previously registered for the event.
 281  *
 282  ******************************************************************************/
 283
 284 static u32 acpi_ev_fixed_event_dispatch(u32 event)
 285 {
 286
 287         ACPI_FUNCTION_ENTRY();
 288
 289         /* Clear the status bit */
 290
 291         (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 292                                       status_register_id, ACPI_CLEAR_STATUS);
 293
 294         /*
 295          * Make sure we've got a handler. If not, report an error. The event is
 296          * disabled to prevent further interrupts.
 297          */
 298         if (NULL == acpi_gbl_fixed_event_handlers[event].handler) {
 299                 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 300                                               enable_register_id,
 301                                               ACPI_DISABLE_EVENT);
 302
 303                 ACPI_ERROR((AE_INFO,
 304                             "No installed handler for fixed event [0x%08X]",
 305                             event));
 306
 307                 return (ACPI_INTERRUPT_NOT_HANDLED);
 308         }
 309
 310         /* Invoke the Fixed Event handler */
 311
 312         return ((acpi_gbl_fixed_event_handlers[event].
 313                  handler) (acpi_gbl_fixed_event_handlers[event].context));
 314 }