drivers/acpi/acpica/evgpeblk.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeblk - GPE block creation and initialization.
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evgpeblk")
  51 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
  55                           u32 interrupt_number);
  56
  57 static acpi_status
  58 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ev_install_gpe_block
  63  *
  64  * PARAMETERS:  gpe_block               - New GPE block
  65  *              interrupt_number        - Xrupt to be associated with this
  66  *                                        GPE block
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Install new GPE block with mutex support
  71  *
  72  ******************************************************************************/
  73
  74 static acpi_status
  75 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
  76                           u32 interrupt_number)
  77 {
  78         struct acpi_gpe_block_info *next_gpe_block;
  79         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
  80         acpi_status status;
  81         acpi_cpu_flags flags;
  82
  83         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
  84
  85         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
  86         if (ACPI_FAILURE(status)) {
  87                 return_ACPI_STATUS(status);
  88         }
  89
  90         status =
  91             acpi_ev_get_gpe_xrupt_block(interrupt_number, &gpe_xrupt_block);
  92         if (ACPI_FAILURE(status)) {
  93                 goto unlock_and_exit;
  94         }
  95
  96         /* Install the new block at the end of the list with lock */
  97
  98         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
  99         if (gpe_xrupt_block->gpe_block_list_head) {
 100                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 101                 while (next_gpe_block->next) {
 102                         next_gpe_block = next_gpe_block->next;
 103                 }
 104
 105                 next_gpe_block->next = gpe_block;
 106                 gpe_block->previous = next_gpe_block;
 107         } else {
 108                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
 109         }
 110
 111         gpe_block->xrupt_block = gpe_xrupt_block;
 112         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 113
 114 unlock_and_exit:
 115         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 116         return_ACPI_STATUS(status);
 117 }
 118
 119 /*******************************************************************************
 120  *
 121  * FUNCTION:    acpi_ev_delete_gpe_block
 122  *
 123  * PARAMETERS:  gpe_block           - Existing GPE block
 124  *
 125  * RETURN:      Status
 126  *
 127  * DESCRIPTION: Remove a GPE block
 128  *
 129  ******************************************************************************/
 130
 131 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
 132 {
 133         acpi_status status;
 134         acpi_cpu_flags flags;
 135
 136         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 137
 138         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 139         if (ACPI_FAILURE(status)) {
 140                 return_ACPI_STATUS(status);
 141         }
 142
 143         /* Disable all GPEs in this block */
 144
 145         status =
 146             acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);
 147
 148         if (!gpe_block->previous && !gpe_block->next) {
 149
 150                 /* This is the last gpe_block on this interrupt */
 151
 152                 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
 153                 if (ACPI_FAILURE(status)) {
 154                         goto unlock_and_exit;
 155                 }
 156         } else {
 157                 /* Remove the block on this interrupt with lock */
 158
 159                 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 160                 if (gpe_block->previous) {
 161                         gpe_block->previous->next = gpe_block->next;
 162                 } else {
 163                         gpe_block->xrupt_block->gpe_block_list_head =
 164                             gpe_block->next;
 165                 }
 166
 167                 if (gpe_block->next) {
 168                         gpe_block->next->previous = gpe_block->previous;
 169                 }
 170
 171                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 172         }
 173
 174         acpi_current_gpe_count -= gpe_block->gpe_count;
 175
 176         /* Free the gpe_block */
 177
 178         ACPI_FREE(gpe_block->register_info);
 179         ACPI_FREE(gpe_block->event_info);
 180         ACPI_FREE(gpe_block);
 181
 182 unlock_and_exit:
 183         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 184         return_ACPI_STATUS(status);
 185 }
 186
 187 /*******************************************************************************
 188  *
 189  * FUNCTION:    acpi_ev_create_gpe_info_blocks
 190  *
 191  * PARAMETERS:  gpe_block   - New GPE block
 192  *
 193  * RETURN:      Status
 194  *
 195  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 196  *
 197  ******************************************************************************/
 198
 199 static acpi_status
 200 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
 201 {
 202         struct acpi_gpe_register_info *gpe_register_info = NULL;
 203         struct acpi_gpe_event_info *gpe_event_info = NULL;
 204         struct acpi_gpe_event_info *this_event;
 205         struct acpi_gpe_register_info *this_register;
 206         u32 i;
 207         u32 j;
 208         acpi_status status;
 209
 210         ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);
 211
 212         /* Allocate the GPE register information block */
 213
 214         gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size)gpe_block->
 215                                                  register_count *
 216                                                  sizeof(struct
 217                                                         acpi_gpe_register_info));
 218         if (!gpe_register_info) {
 219                 ACPI_ERROR((AE_INFO,
 220                             "Could not allocate the GpeRegisterInfo table"));
 221                 return_ACPI_STATUS(AE_NO_MEMORY);
 222         }
 223
 224         /*
 225          * Allocate the GPE event_info block. There are eight distinct GPEs
 226          * per register. Initialization to zeros is sufficient.
 227          */
 228         gpe_event_info = ACPI_ALLOCATE_ZEROED((acpi_size)gpe_block->gpe_count *
 229                                               sizeof(struct
 230                                                      acpi_gpe_event_info));
 231         if (!gpe_event_info) {
 232                 ACPI_ERROR((AE_INFO,
 233                             "Could not allocate the GpeEventInfo table"));
 234                 status = AE_NO_MEMORY;
 235                 goto error_exit;
 236         }
 237
 238         /* Save the new Info arrays in the GPE block */
 239
 240         gpe_block->register_info = gpe_register_info;
 241         gpe_block->event_info = gpe_event_info;
 242
 243         /*
 244          * Initialize the GPE Register and Event structures. A goal of these
 245          * tables is to hide the fact that there are two separate GPE register
 246          * sets in a given GPE hardware block, the status registers occupy the
 247          * first half, and the enable registers occupy the second half.
 248          */
 249         this_register = gpe_register_info;
 250         this_event = gpe_event_info;
 251
 252         for (i = 0; i < gpe_block->register_count; i++) {
 253
 254                 /* Init the register_info for this GPE register (8 GPEs) */
 255
 256                 this_register->base_gpe_number = (u16)
 257                     (gpe_block->block_base_number +
 258                      (i * ACPI_GPE_REGISTER_WIDTH));
 259
 260                 this_register->status_address.address = gpe_block->address + i;
 261
 262                 this_register->enable_address.address =
 263                     gpe_block->address + i + gpe_block->register_count;
 264
 265                 this_register->status_address.space_id = gpe_block->space_id;
 266                 this_register->enable_address.space_id = gpe_block->space_id;
 267                 this_register->status_address.bit_width =
 268                     ACPI_GPE_REGISTER_WIDTH;
 269                 this_register->enable_address.bit_width =
 270                     ACPI_GPE_REGISTER_WIDTH;
 271                 this_register->status_address.bit_offset = 0;
 272                 this_register->enable_address.bit_offset = 0;
 273
 274                 /* Init the event_info for each GPE within this register */
 275
 276                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 277                         this_event->gpe_number =
 278                             (u8) (this_register->base_gpe_number + j);
 279                         this_event->register_info = this_register;
 280                         this_event++;
 281                 }
 282
 283                 /* Disable all GPEs within this register */
 284
 285                 status = acpi_hw_write(0x00, &this_register->enable_address);
 286                 if (ACPI_FAILURE(status)) {
 287                         goto error_exit;
 288                 }
 289
 290                 /* Clear any pending GPE events within this register */
 291
 292                 status = acpi_hw_write(0xFF, &this_register->status_address);
 293                 if (ACPI_FAILURE(status)) {
 294                         goto error_exit;
 295                 }
 296
 297                 this_register++;
 298         }
 299
 300         return_ACPI_STATUS(AE_OK);
 301
 302 error_exit:
 303         if (gpe_register_info) {
 304                 ACPI_FREE(gpe_register_info);
 305         }
 306         if (gpe_event_info) {
 307                 ACPI_FREE(gpe_event_info);
 308         }
 309
 310         return_ACPI_STATUS(status);
 311 }
 312
 313 /*******************************************************************************
 314  *
 315  * FUNCTION:    acpi_ev_create_gpe_block
 316  *
 317  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 318  *              gpe_block_address   - Address and space_ID
 319  *              register_count      - Number of GPE register pairs in the block
 320  *              gpe_block_base_number - Starting GPE number for the block
 321  *              interrupt_number    - H/W interrupt for the block
 322  *              return_gpe_block    - Where the new block descriptor is returned
 323  *
 324  * RETURN:      Status
 325  *
 326  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 327  *              the block are disabled at exit.
 328  *              Note: Assumes namespace is locked.
 329  *
 330  ******************************************************************************/
 331
 332 acpi_status
 333 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
 334                          u64 address,
 335                          u8 space_id,
 336                          u32 register_count,
 337                          u16 gpe_block_base_number,
 338                          u32 interrupt_number,
 339                          struct acpi_gpe_block_info **return_gpe_block)
 340 {
 341         acpi_status status;
 342         struct acpi_gpe_block_info *gpe_block;
 343         struct acpi_gpe_walk_info walk_info;
 344
 345         ACPI_FUNCTION_TRACE(ev_create_gpe_block);
 346
 347         if (!register_count) {
 348                 return_ACPI_STATUS(AE_OK);
 349         }
 350
 351         /* Allocate a new GPE block */
 352
 353         gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
 354         if (!gpe_block) {
 355                 return_ACPI_STATUS(AE_NO_MEMORY);
 356         }
 357
 358         /* Initialize the new GPE block */
 359
 360         gpe_block->address = address;
 361         gpe_block->space_id = space_id;
 362         gpe_block->node = gpe_device;
 363         gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH);
 364         gpe_block->initialized = FALSE;
 365         gpe_block->register_count = register_count;
 366         gpe_block->block_base_number = gpe_block_base_number;
 367
 368         /*
 369          * Create the register_info and event_info sub-structures
 370          * Note: disables and clears all GPEs in the block
 371          */
 372         status = acpi_ev_create_gpe_info_blocks(gpe_block);
 373         if (ACPI_FAILURE(status)) {
 374                 ACPI_FREE(gpe_block);
 375                 return_ACPI_STATUS(status);
 376         }
 377
 378         /* Install the new block in the global lists */
 379
 380         status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
 381         if (ACPI_FAILURE(status)) {
 382                 ACPI_FREE(gpe_block->register_info);
 383                 ACPI_FREE(gpe_block->event_info);
 384                 ACPI_FREE(gpe_block);
 385                 return_ACPI_STATUS(status);
 386         }
 387
 388         acpi_gbl_all_gpes_initialized = FALSE;
 389
 390         /* Find all GPE methods (_Lxx or_Exx) for this block */
 391
 392         walk_info.gpe_block = gpe_block;
 393         walk_info.gpe_device = gpe_device;
 394         walk_info.execute_by_owner_id = FALSE;
 395
 396         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 397                                         ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
 398                                         acpi_ev_match_gpe_method, NULL,
 399                                         &walk_info, NULL);
 400
 401         /* Return the new block */
 402
 403         if (return_gpe_block) {
 404                 (*return_gpe_block) = gpe_block;
 405         }
 406
 407         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 408                               "    Initialized GPE %02X to %02X [%4.4s] %u regs on interrupt 0x%X%s\n",
 409                               (u32)gpe_block->block_base_number,
 410                               (u32)(gpe_block->block_base_number +
 411                                     (gpe_block->gpe_count - 1)),
 412                               gpe_device->name.ascii, gpe_block->register_count,
 413                               interrupt_number,
 414                               interrupt_number ==
 415                               acpi_gbl_FADT.sci_interrupt ? " (SCI)" : ""));
 416
 417         /* Update global count of currently available GPEs */
 418
 419         acpi_current_gpe_count += gpe_block->gpe_count;
 420         return_ACPI_STATUS(AE_OK);
 421 }
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_ev_initialize_gpe_block
 426  *
 427  * PARAMETERS:  acpi_gpe_callback
 428  *
 429  * RETURN:      Status
 430  *
 431  * DESCRIPTION: Initialize and enable a GPE block. Enable GPEs that have
 432  *              associated methods.
 433  *              Note: Assumes namespace is locked.
 434  *
 435  ******************************************************************************/
 436
 437 acpi_status
 438 acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 439                              struct acpi_gpe_block_info *gpe_block,
 440                              void *ignored)
 441 {
 442         acpi_status status;
 443         struct acpi_gpe_event_info *gpe_event_info;
 444         u32 gpe_enabled_count;
 445         u32 gpe_index;
 446         u32 i;
 447         u32 j;
 448
 449         ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
 450
 451         /*
 452          * Ignore a null GPE block (e.g., if no GPE block 1 exists), and
 453          * any GPE blocks that have been initialized already.
 454          */
 455         if (!gpe_block || gpe_block->initialized) {
 456                 return_ACPI_STATUS(AE_OK);
 457         }
 458
 459         /*
 460          * Enable all GPEs that have a corresponding method and have the
 461          * ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block
 462          * must be enabled via the acpi_enable_gpe() interface.
 463          */
 464         gpe_enabled_count = 0;
 465
 466         for (i = 0; i < gpe_block->register_count; i++) {
 467                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 468
 469                         /* Get the info block for this particular GPE */
 470
 471                         gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j;
 472                         gpe_event_info = &gpe_block->event_info[gpe_index];
 473
 474                         /*
 475                          * Ignore GPEs that have no corresponding _Lxx/_Exx method
 476                          * and GPEs that are used to wake the system
 477                          */
 478                         if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
 479                              ACPI_GPE_DISPATCH_NONE)
 480                             || (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
 481                                 ACPI_GPE_DISPATCH_HANDLER)
 482                             || (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
 483                                 ACPI_GPE_DISPATCH_RAW_HANDLER)
 484                             || (gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 485                                 continue;
 486                         }
 487
 488                         status = acpi_ev_add_gpe_reference(gpe_event_info);
 489                         if (ACPI_FAILURE(status)) {
 490                                 ACPI_EXCEPTION((AE_INFO, status,
 491                                         "Could not enable GPE 0x%02X",
 492                                         gpe_index +
 493                                         gpe_block->block_base_number));
 494                                 continue;
 495                         }
 496
 497                         gpe_enabled_count++;
 498                 }
 499         }
 500
 501         if (gpe_enabled_count) {
 502                 ACPI_INFO(("Enabled %u GPEs in block %02X to %02X",
 503                            gpe_enabled_count, (u32)gpe_block->block_base_number,
 504                            (u32)(gpe_block->block_base_number +
 505                                  (gpe_block->gpe_count - 1))));
 506         }
 507
 508         gpe_block->initialized = TRUE;
 509
 510         return_ACPI_STATUS(AE_OK);
 511 }
 512
 513 #endif                          /* !ACPI_REDUCED_HARDWARE */