drivers/bus/acpi/events/evrgnini.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evrgnini- ACPI Address_space (Op_region) init
   4  *              $Revision$
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  *  Copyright (C) 2000, 2001 R. Byron Moore
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26
  27 #include "acpi.h"
  28 #include "acevents.h"
  29 #include "acnamesp.h"
  30 #include "acinterp.h"
  31 #include "amlcode.h"
  32
  33 #define _COMPONENT          ACPI_EVENTS
  34          MODULE_NAME         ("evrgnini")
  35
  36
  37 /*****************************************************************************
  38  *
  39  * FUNCTION:    Acpi_ev_system_memory_region_setup
  40  *
  41  * PARAMETERS:  Region_obj          - region we are interested in
  42  *              Function            - start or stop
  43  *              Handler_context     - Address space handler context
  44  *              Region_context      - Region specific context
  45  *
  46  * RETURN:      Status
  47  *
  48  * DESCRIPTION: Do any prep work for region handling, a nop for now
  49  *
  50  ****************************************************************************/
  51
  52 ACPI_STATUS
  53 acpi_ev_system_memory_region_setup (
  54         ACPI_HANDLE             handle,
  55         u32                     function,
  56         void                    *handler_context,
  57         void                    **region_context)
  58 {
  59
  60         if (function == ACPI_REGION_DEACTIVATE) {
  61                 if (*region_context) {
  62                         acpi_cm_free (*region_context);
  63                         *region_context = NULL;
  64                 }
  65                 return (AE_OK);
  66         }
  67
  68
  69         /* Activate.  Create a new context */
  70
  71         *region_context = acpi_cm_callocate (sizeof (MEM_HANDLER_CONTEXT));
  72         if (!(*region_context)) {
  73                 return (AE_NO_MEMORY);
  74         }
  75
  76         return (AE_OK);
  77 }
  78
  79
  80 /*****************************************************************************
  81  *
  82  * FUNCTION:    Acpi_ev_io_space_region_setup
  83  *
  84  * PARAMETERS:  Region_obj          - region we are interested in
  85  *              Function            - start or stop
  86  *              Handler_context     - Address space handler context
  87  *              Region_context      - Region specific context
  88  *
  89  * RETURN:      Status
  90  *
  91  * DESCRIPTION: Do any prep work for region handling
  92  *
  93  ****************************************************************************/
  94
  95 ACPI_STATUS
  96 acpi_ev_io_space_region_setup (
  97         ACPI_HANDLE             handle,
  98         u32                     function,
  99         void                    *handler_context,
 100         void                    **region_context)
 101 {
 102         if (function == ACPI_REGION_DEACTIVATE) {
 103                 *region_context = NULL;
 104         }
 105         else {
 106                 *region_context = handler_context;
 107         }
 108
 109         return (AE_OK);
 110 }
 111
 112
 113 /*****************************************************************************
 114  *
 115  * FUNCTION:    Acpi_ev_pci_config_region_setup
 116  *
 117  * PARAMETERS:  Region_obj          - region we are interested in
 118  *              Function            - start or stop
 119  *              Handler_context     - Address space handler context
 120  *              Region_context      - Region specific context
 121  *
 122  * RETURN:      Status
 123  *
 124  * DESCRIPTION: Do any prep work for region handling
 125  *
 126  * MUTEX:       Assumes namespace is not locked
 127  *
 128  ****************************************************************************/
 129
 130 ACPI_STATUS
 131 acpi_ev_pci_config_region_setup (
 132         ACPI_HANDLE             handle,
 133         u32                     function,
 134         void                    *handler_context,
 135         void                    **region_context)
 136 {
 137         ACPI_STATUS             status = AE_OK;
 138         ACPI_INTEGER            temp;
 139         PCI_HANDLER_CONTEXT     *pci_context = *region_context;
 140         ACPI_OPERAND_OBJECT     *handler_obj;
 141         ACPI_NAMESPACE_NODE     *node;
 142         ACPI_OPERAND_OBJECT     *region_obj = (ACPI_OPERAND_OBJECT *) handle;
 143         DEVICE_ID               object_hID;
 144
 145         handler_obj = region_obj->region.addr_handler;
 146
 147         if (!handler_obj) {
 148                 /*
 149                  *  No installed handler. This shouldn't happen because the dispatch
 150                  *  routine checks before we get here, but we check again just in case.
 151                  */
 152                 return(AE_NOT_EXIST);
 153         }
 154
 155         if (function == ACPI_REGION_DEACTIVATE) {
 156                 if (pci_context) {
 157                         acpi_cm_free (pci_context);
 158                         *region_context = NULL;
 159                 }
 160
 161                 return (status);
 162         }
 163
 164
 165         /* Create a new context */
 166
 167         pci_context = acpi_cm_callocate (sizeof(PCI_HANDLER_CONTEXT));
 168         if (!pci_context) {
 169                 return (AE_NO_MEMORY);
 170         }
 171
 172         /*
 173          *  For PCI Config space access, we have to pass the segment, bus,
 174          *  device and function numbers.  This routine must acquire those.
 175          */
 176
 177         /*
 178          *  First get device and function numbers from the _ADR object
 179          *  in the parent's scope.
 180          */
 181         ACPI_ASSERT(region_obj->region.node);
 182
 183         node = acpi_ns_get_parent_object (region_obj->region.node);
 184
 185
 186         /* Acpi_evaluate the _ADR object */
 187
 188         status = acpi_cm_evaluate_numeric_object (METHOD_NAME__ADR, node, &temp);
 189         /*
 190          *  The default is zero, since the allocation above zeroed the data, just
 191          *  do nothing on failures.
 192          */
 193         if (ACPI_SUCCESS (status)) {
 194                 /*
 195                  *  Got it..
 196                  */
 197                 pci_context->dev_func = (u32) temp;
 198         }
 199
 200         /*
 201          *  Get the _SEG and _BBN values from the device upon which the handler
 202          *  is installed.
 203          *
 204          *  We need to get the _SEG and _BBN objects relative to the PCI BUS device.
 205          *  This is the device the handler has been registered to handle.
 206          */
 207
 208         /*
 209          *  If the Addr_handler.Node is still pointing to the root, we need
 210          *  to scan upward for a PCI Root bridge and re-associate the Op_region
 211          *  handlers with that device.
 212          */
 213         if (handler_obj->addr_handler.node == acpi_gbl_root_node) {
 214                 /*
 215                  * Node is currently the parent object
 216                  */
 217                 while (node != acpi_gbl_root_node) {
 218                         status = acpi_cm_execute_HID(node, &object_hID);
 219
 220                         if (ACPI_SUCCESS (status)) {
 221                                 if (!(STRNCMP(object_hID.buffer, PCI_ROOT_HID_STRING,
 222                                                    sizeof (PCI_ROOT_HID_STRING)))) {
 223                                         acpi_install_address_space_handler(node,
 224                                                            ADDRESS_SPACE_PCI_CONFIG,
 225                                                            ACPI_DEFAULT_HANDLER, NULL, NULL);
 226
 227                                         break;
 228                                 }
 229                         }
 230
 231                         node = acpi_ns_get_parent_object(node);
 232                 }
 233         }
 234         else {
 235                 node = handler_obj->addr_handler.node;
 236         }
 237
 238         status = acpi_cm_evaluate_numeric_object (METHOD_NAME__SEG, node, &temp);
 239         if (ACPI_SUCCESS (status)) {
 240                 /*
 241                  *  Got it..
 242                  */
 243                 pci_context->seg = (u32) temp;
 244         }
 245
 246         status = acpi_cm_evaluate_numeric_object (METHOD_NAME__BBN, node, &temp);
 247         if (ACPI_SUCCESS (status)) {
 248                 /*
 249                  *  Got it..
 250                  */
 251                 pci_context->bus = (u32) temp;
 252         }
 253
 254         *region_context = pci_context;
 255
 256         return (AE_OK);
 257 }
 258
 259
 260 /*****************************************************************************
 261  *
 262  * FUNCTION:    Acpi_ev_default_region_setup
 263  *
 264  * PARAMETERS:  Region_obj          - region we are interested in
 265  *              Function            - start or stop
 266  *              Handler_context     - Address space handler context
 267  *              Region_context      - Region specific context
 268  *
 269  * RETURN:      Status
 270  *
 271  * DESCRIPTION: Do any prep work for region handling
 272  *
 273  ****************************************************************************/
 274
 275 ACPI_STATUS
 276 acpi_ev_default_region_setup (
 277         ACPI_HANDLE             handle,
 278         u32                     function,
 279         void                    *handler_context,
 280         void                    **region_context)
 281 {
 282         if (function == ACPI_REGION_DEACTIVATE) {
 283                 *region_context = NULL;
 284         }
 285         else {
 286                 *region_context = handler_context;
 287         }
 288
 289         return (AE_OK);
 290 }
 291
 292
 293 /******************************************************************************
 294  *
 295  * FUNCTION:    Acpi_ev_initialize_region
 296  *
 297  * PARAMETERS:  Region_obj - Region we are initializing
 298  *
 299  * RETURN:      Status
 300  *
 301  * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 302  *              for execution at a later time
 303  *
 304  *              Get the appropriate address space handler for a newly
 305  *              created region.
 306  *
 307  *              This also performs address space specific intialization.  For
 308  *              example, PCI regions must have an _ADR object that contains
 309  *              a PCI address in the scope of the defintion.  This address is
 310  *              required to perform an access to PCI config space.
 311  *
 312  ******************************************************************************/
 313
 314 ACPI_STATUS
 315 acpi_ev_initialize_region (
 316         ACPI_OPERAND_OBJECT     *region_obj,
 317         u8                      acpi_ns_locked)
 318 {
 319         ACPI_OPERAND_OBJECT    *handler_obj;
 320         ACPI_OPERAND_OBJECT    *obj_desc;
 321         ACPI_ADDRESS_SPACE_TYPE space_id;
 322         ACPI_NAMESPACE_NODE    *node;
 323         ACPI_STATUS             status;
 324         ACPI_NAMESPACE_NODE    *method_node;
 325         ACPI_NAME              *reg_name_ptr = (ACPI_NAME *) METHOD_NAME__REG;
 326
 327
 328         if (!region_obj) {
 329                 return (AE_BAD_PARAMETER);
 330         }
 331
 332         ACPI_ASSERT(region_obj->region.node);
 333
 334         node = acpi_ns_get_parent_object (region_obj->region.node);
 335         space_id = region_obj->region.space_id;
 336
 337         region_obj->region.addr_handler = NULL;
 338         region_obj->region.extra->extra.method_REG = NULL;
 339         region_obj->region.flags &= ~(AOPOBJ_INITIALIZED);
 340
 341         /*
 342          *  Find any "_REG" associated with this region definition
 343          */
 344         status = acpi_ns_search_node (*reg_name_ptr, node,
 345                           ACPI_TYPE_METHOD, &method_node);
 346         if (ACPI_SUCCESS (status)) {
 347                 /*
 348                  *  The _REG method is optional and there can be only one per region
 349                  *  definition.  This will be executed when the handler is attached
 350                  *  or removed
 351                  */
 352                 region_obj->region.extra->extra.method_REG = method_node;
 353         }
 354
 355         /*
 356          *  The following loop depends upon the root Node having no parent
 357          *  ie: Acpi_gbl_Root_node->Parent_entry being set to NULL
 358          */
 359         while (node) {
 360                 /*
 361                  *  Check to see if a handler exists
 362                  */
 363                 handler_obj = NULL;
 364                 obj_desc = acpi_ns_get_attached_object ((ACPI_HANDLE) node);
 365                 if (obj_desc) {
 366                         /*
 367                          *  can only be a handler if the object exists
 368                          */
 369                         switch (node->type) {
 370                         case ACPI_TYPE_DEVICE:
 371
 372                                 handler_obj = obj_desc->device.addr_handler;
 373                                 break;
 374
 375                         case ACPI_TYPE_PROCESSOR:
 376
 377                                 handler_obj = obj_desc->processor.addr_handler;
 378                                 break;
 379
 380                         case ACPI_TYPE_THERMAL:
 381
 382                                 handler_obj = obj_desc->thermal_zone.addr_handler;
 383                                 break;
 384                         }
 385
 386                         while (handler_obj) {
 387                                 /*
 388                                  *  This guy has at least one address handler
 389                                  *  see if it has the type we want
 390                                  */
 391                                 if (handler_obj->addr_handler.space_id == space_id) {
 392                                         /*
 393                                          *  Found it! Now update the region and the handler
 394                                          */
 395                                         acpi_ev_associate_region_and_handler (handler_obj, region_obj, acpi_ns_locked);
 396                                         return (AE_OK);
 397                                 }
 398
 399                                 handler_obj = handler_obj->addr_handler.next;
 400
 401                         } /* while handlerobj */
 402                 }
 403
 404                 /*
 405                  *  This one does not have the handler we need
 406                  *  Pop up one level
 407                  */
 408                 node = acpi_ns_get_parent_object (node);
 409
 410         } /* while Node != ROOT */
 411
 412         /*
 413          *  If we get here, there is no handler for this region
 414          */
 415         return (AE_NOT_EXIST);
 416 }
 417