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

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeutil - GPE utilities
   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("evgpeutil")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ev_walk_gpe_list
  54  *
  55  * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
  56  *              Context             - Value passed to callback
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Walk the GPE lists.
  61  *
  62  ******************************************************************************/
  63 acpi_status
  64 acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
  65 {
  66         struct acpi_gpe_block_info *gpe_block;
  67         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
  68         acpi_status status = AE_OK;
  69         acpi_cpu_flags flags;
  70
  71         ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
  72
  73         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
  74
  75         /* Walk the interrupt level descriptor list */
  76
  77         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
  78         while (gpe_xrupt_info) {
  79
  80                 /* Walk all Gpe Blocks attached to this interrupt level */
  81
  82                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
  83                 while (gpe_block) {
  84
  85                         /* One callback per GPE block */
  86
  87                         status =
  88                             gpe_walk_callback(gpe_xrupt_info, gpe_block,
  89                                               context);
  90                         if (ACPI_FAILURE(status)) {
  91                                 if (status == AE_CTRL_END) {    /* Callback abort */
  92                                         status = AE_OK;
  93                                 }
  94                                 goto unlock_and_exit;
  95                         }
  96
  97                         gpe_block = gpe_block->next;
  98                 }
  99
 100                 gpe_xrupt_info = gpe_xrupt_info->next;
 101         }
 102
 103       unlock_and_exit:
 104         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 105         return_ACPI_STATUS(status);
 106 }
 107
 108 /*******************************************************************************
 109  *
 110  * FUNCTION:    acpi_ev_valid_gpe_event
 111  *
 112  * PARAMETERS:  gpe_event_info              - Info for this GPE
 113  *
 114  * RETURN:      TRUE if the gpe_event is valid
 115  *
 116  * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
 117  *              Should be called only when the GPE lists are semaphore locked
 118  *              and not subject to change.
 119  *
 120  ******************************************************************************/
 121
 122 u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
 123 {
 124         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
 125         struct acpi_gpe_block_info *gpe_block;
 126
 127         ACPI_FUNCTION_ENTRY();
 128
 129         /* No need for spin lock since we are not changing any list elements */
 130
 131         /* Walk the GPE interrupt levels */
 132
 133         gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
 134         while (gpe_xrupt_block) {
 135                 gpe_block = gpe_xrupt_block->gpe_block_list_head;
 136
 137                 /* Walk the GPE blocks on this interrupt level */
 138
 139                 while (gpe_block) {
 140                         if ((&gpe_block->event_info[0] <= gpe_event_info) &&
 141                             (&gpe_block->event_info[gpe_block->gpe_count] >
 142                              gpe_event_info)) {
 143                                 return (TRUE);
 144                         }
 145
 146                         gpe_block = gpe_block->next;
 147                 }
 148
 149                 gpe_xrupt_block = gpe_xrupt_block->next;
 150         }
 151
 152         return (FALSE);
 153 }
 154
 155 /*******************************************************************************
 156  *
 157  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 158  *
 159  * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
 160  *
 161  * RETURN:      A GPE interrupt block
 162  *
 163  * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
 164  *              block per unique interrupt level used for GPEs. Should be
 165  *              called only when the GPE lists are semaphore locked and not
 166  *              subject to change.
 167  *
 168  ******************************************************************************/
 169
 170 struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32 interrupt_number)
 171 {
 172         struct acpi_gpe_xrupt_info *next_gpe_xrupt;
 173         struct acpi_gpe_xrupt_info *gpe_xrupt;
 174         acpi_status status;
 175         acpi_cpu_flags flags;
 176
 177         ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
 178
 179         /* No need for lock since we are not changing any list elements here */
 180
 181         next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 182         while (next_gpe_xrupt) {
 183                 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
 184                         return_PTR(next_gpe_xrupt);
 185                 }
 186
 187                 next_gpe_xrupt = next_gpe_xrupt->next;
 188         }
 189
 190         /* Not found, must allocate a new xrupt descriptor */
 191
 192         gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
 193         if (!gpe_xrupt) {
 194                 return_PTR(NULL);
 195         }
 196
 197         gpe_xrupt->interrupt_number = interrupt_number;
 198
 199         /* Install new interrupt descriptor with spin lock */
 200
 201         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 202         if (acpi_gbl_gpe_xrupt_list_head) {
 203                 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 204                 while (next_gpe_xrupt->next) {
 205                         next_gpe_xrupt = next_gpe_xrupt->next;
 206                 }
 207
 208                 next_gpe_xrupt->next = gpe_xrupt;
 209                 gpe_xrupt->previous = next_gpe_xrupt;
 210         } else {
 211                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
 212         }
 213         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 214
 215         /* Install new interrupt handler if not SCI_INT */
 216
 217         if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
 218                 status = acpi_os_install_interrupt_handler(interrupt_number,
 219                                                            acpi_ev_gpe_xrupt_handler,
 220                                                            gpe_xrupt);
 221                 if (ACPI_FAILURE(status)) {
 222                         ACPI_ERROR((AE_INFO,
 223                                     "Could not install GPE interrupt handler at level 0x%X",
 224                                     interrupt_number));
 225                         return_PTR(NULL);
 226                 }
 227         }
 228
 229         return_PTR(gpe_xrupt);
 230 }
 231
 232 /*******************************************************************************
 233  *
 234  * FUNCTION:    acpi_ev_delete_gpe_xrupt
 235  *
 236  * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 237  *
 238  * RETURN:      Status
 239  *
 240  * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 241  *              interrupt handler if not the SCI interrupt.
 242  *
 243  ******************************************************************************/
 244
 245 acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
 246 {
 247         acpi_status status;
 248         acpi_cpu_flags flags;
 249
 250         ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
 251
 252         /* We never want to remove the SCI interrupt handler */
 253
 254         if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
 255                 gpe_xrupt->gpe_block_list_head = NULL;
 256                 return_ACPI_STATUS(AE_OK);
 257         }
 258
 259         /* Disable this interrupt */
 260
 261         status =
 262             acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
 263                                              acpi_ev_gpe_xrupt_handler);
 264         if (ACPI_FAILURE(status)) {
 265                 return_ACPI_STATUS(status);
 266         }
 267
 268         /* Unlink the interrupt block with lock */
 269
 270         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 271         if (gpe_xrupt->previous) {
 272                 gpe_xrupt->previous->next = gpe_xrupt->next;
 273         } else {
 274                 /* No previous, update list head */
 275
 276                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
 277         }
 278
 279         if (gpe_xrupt->next) {
 280                 gpe_xrupt->next->previous = gpe_xrupt->previous;
 281         }
 282         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 283
 284         /* Free the block */
 285
 286         ACPI_FREE(gpe_xrupt);
 287         return_ACPI_STATUS(AE_OK);
 288 }
 289
 290 /*******************************************************************************
 291  *
 292  * FUNCTION:    acpi_ev_delete_gpe_handlers
 293  *
 294  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 295  *              gpe_block           - Gpe Block info
 296  *
 297  * RETURN:      Status
 298  *
 299  * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 300  *              Used only prior to termination.
 301  *
 302  ******************************************************************************/
 303
 304 acpi_status
 305 acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 306                             struct acpi_gpe_block_info *gpe_block,
 307                             void *context)
 308 {
 309         struct acpi_gpe_event_info *gpe_event_info;
 310         u32 i;
 311         u32 j;
 312
 313         ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
 314
 315         /* Examine each GPE Register within the block */
 316
 317         for (i = 0; i < gpe_block->register_count; i++) {
 318
 319                 /* Now look at the individual GPEs in this byte register */
 320
 321                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 322                         gpe_event_info = &gpe_block->event_info[((acpi_size) i *
 323                                                                  ACPI_GPE_REGISTER_WIDTH)
 324                                                                 + j];
 325
 326                         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 327                             ACPI_GPE_DISPATCH_HANDLER) {
 328                                 ACPI_FREE(gpe_event_info->dispatch.handler);
 329                                 gpe_event_info->dispatch.handler = NULL;
 330                                 gpe_event_info->flags &=
 331                                     ~ACPI_GPE_DISPATCH_MASK;
 332                         }
 333                 }
 334         }
 335
 336         return_ACPI_STATUS(AE_OK);
 337 }