Staging: strip: delete the driver
[linux/fpc-iii.git] / drivers / acpi / acpica / nsinit.c
blob9bd6f050f299ef55b545dac56a890d8f3219bc18
1 /******************************************************************************
3 * Module Name: nsinit - namespace initialization
5 *****************************************************************************/
7 /*
8 * Copyright (C) 2000 - 2010, Intel Corp.
9 * All rights reserved.
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.
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.
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.
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acnamesp.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include <linux/nmi.h>
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nsinit")
54 /* Local prototypes */
55 static acpi_status
56 acpi_ns_init_one_object(acpi_handle obj_handle,
57 u32 level, void *context, void **return_value);
59 static acpi_status
60 acpi_ns_init_one_device(acpi_handle obj_handle,
61 u32 nesting_level, void *context, void **return_value);
63 static acpi_status
64 acpi_ns_find_ini_methods(acpi_handle obj_handle,
65 u32 nesting_level, void *context, void **return_value);
67 /*******************************************************************************
69 * FUNCTION: acpi_ns_initialize_objects
71 * PARAMETERS: None
73 * RETURN: Status
75 * DESCRIPTION: Walk the entire namespace and perform any necessary
76 * initialization on the objects found therein
78 ******************************************************************************/
80 acpi_status acpi_ns_initialize_objects(void)
82 acpi_status status;
83 struct acpi_init_walk_info info;
85 ACPI_FUNCTION_TRACE(ns_initialize_objects);
87 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
88 "**** Starting initialization of namespace objects ****\n"));
89 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
90 "Completing Region/Field/Buffer/Package initialization:"));
92 /* Set all init info to zero */
94 ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
96 /* Walk entire namespace from the supplied root */
98 status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
99 ACPI_UINT32_MAX, acpi_ns_init_one_object, NULL,
100 &info, NULL);
101 if (ACPI_FAILURE(status)) {
102 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
105 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
106 "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd "
107 "Buffers %hd/%hd Packages (%hd nodes)\n",
108 info.op_region_init, info.op_region_count,
109 info.field_init, info.field_count,
110 info.buffer_init, info.buffer_count,
111 info.package_init, info.package_count,
112 info.object_count));
114 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
115 "%hd Control Methods found\n", info.method_count));
116 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
117 "%hd Op Regions found\n", info.op_region_count));
119 return_ACPI_STATUS(AE_OK);
122 /*******************************************************************************
124 * FUNCTION: acpi_ns_initialize_devices
126 * PARAMETERS: None
128 * RETURN: acpi_status
130 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
131 * This means running _INI on all present devices.
133 * Note: We install PCI config space handler on region access,
134 * not here.
136 ******************************************************************************/
138 acpi_status acpi_ns_initialize_devices(void)
140 acpi_status status;
141 struct acpi_device_walk_info info;
143 ACPI_FUNCTION_TRACE(ns_initialize_devices);
145 /* Init counters */
147 info.device_count = 0;
148 info.num_STA = 0;
149 info.num_INI = 0;
151 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
152 "Initializing Device/Processor/Thermal objects "
153 "by executing _INI methods:"));
155 /* Tree analysis: find all subtrees that contain _INI methods */
157 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
158 ACPI_UINT32_MAX, FALSE,
159 acpi_ns_find_ini_methods, NULL, &info,
160 NULL);
161 if (ACPI_FAILURE(status)) {
162 goto error_exit;
165 /* Allocate the evaluation information block */
167 info.evaluate_info =
168 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
169 if (!info.evaluate_info) {
170 status = AE_NO_MEMORY;
171 goto error_exit;
175 * Execute the "global" _INI method that may appear at the root. This
176 * support is provided for Windows compatibility (Vista+) and is not
177 * part of the ACPI specification.
179 info.evaluate_info->prefix_node = acpi_gbl_root_node;
180 info.evaluate_info->pathname = METHOD_NAME__INI;
181 info.evaluate_info->parameters = NULL;
182 info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;
184 status = acpi_ns_evaluate(info.evaluate_info);
185 if (ACPI_SUCCESS(status)) {
186 info.num_INI++;
189 /* Walk namespace to execute all _INIs on present devices */
191 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
192 ACPI_UINT32_MAX, FALSE,
193 acpi_ns_init_one_device, NULL, &info,
194 NULL);
196 ACPI_FREE(info.evaluate_info);
197 if (ACPI_FAILURE(status)) {
198 goto error_exit;
201 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
202 "\nExecuted %hd _INI methods requiring %hd _STA executions "
203 "(examined %hd objects)\n",
204 info.num_INI, info.num_STA, info.device_count));
206 return_ACPI_STATUS(status);
208 error_exit:
209 ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
210 return_ACPI_STATUS(status);
213 /*******************************************************************************
215 * FUNCTION: acpi_ns_init_one_object
217 * PARAMETERS: obj_handle - Node
218 * Level - Current nesting level
219 * Context - Points to a init info struct
220 * return_value - Not used
222 * RETURN: Status
224 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
225 * within the namespace.
227 * Currently, the only objects that require initialization are:
228 * 1) Methods
229 * 2) Op Regions
231 ******************************************************************************/
233 static acpi_status
234 acpi_ns_init_one_object(acpi_handle obj_handle,
235 u32 level, void *context, void **return_value)
237 acpi_object_type type;
238 acpi_status status = AE_OK;
239 struct acpi_init_walk_info *info =
240 (struct acpi_init_walk_info *)context;
241 struct acpi_namespace_node *node =
242 (struct acpi_namespace_node *)obj_handle;
243 union acpi_operand_object *obj_desc;
245 ACPI_FUNCTION_NAME(ns_init_one_object);
247 info->object_count++;
249 /* And even then, we are only interested in a few object types */
251 type = acpi_ns_get_type(obj_handle);
252 obj_desc = acpi_ns_get_attached_object(node);
253 if (!obj_desc) {
254 return (AE_OK);
257 /* Increment counters for object types we are looking for */
259 switch (type) {
260 case ACPI_TYPE_REGION:
261 info->op_region_count++;
262 break;
264 case ACPI_TYPE_BUFFER_FIELD:
265 info->field_count++;
266 break;
268 case ACPI_TYPE_LOCAL_BANK_FIELD:
269 info->field_count++;
270 break;
272 case ACPI_TYPE_BUFFER:
273 info->buffer_count++;
274 break;
276 case ACPI_TYPE_PACKAGE:
277 info->package_count++;
278 break;
280 default:
282 /* No init required, just exit now */
283 return (AE_OK);
286 /* If the object is already initialized, nothing else to do */
288 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
289 return (AE_OK);
292 /* Must lock the interpreter before executing AML code */
294 acpi_ex_enter_interpreter();
297 * Each of these types can contain executable AML code within the
298 * declaration.
300 switch (type) {
301 case ACPI_TYPE_REGION:
303 info->op_region_init++;
304 status = acpi_ds_get_region_arguments(obj_desc);
305 break;
307 case ACPI_TYPE_BUFFER_FIELD:
309 info->field_init++;
310 status = acpi_ds_get_buffer_field_arguments(obj_desc);
311 break;
313 case ACPI_TYPE_LOCAL_BANK_FIELD:
315 info->field_init++;
316 status = acpi_ds_get_bank_field_arguments(obj_desc);
317 break;
319 case ACPI_TYPE_BUFFER:
321 info->buffer_init++;
322 status = acpi_ds_get_buffer_arguments(obj_desc);
323 break;
325 case ACPI_TYPE_PACKAGE:
327 info->package_init++;
328 status = acpi_ds_get_package_arguments(obj_desc);
329 break;
331 default:
332 /* No other types can get here */
333 break;
336 if (ACPI_FAILURE(status)) {
337 ACPI_EXCEPTION((AE_INFO, status,
338 "Could not execute arguments for [%4.4s] (%s)",
339 acpi_ut_get_node_name(node),
340 acpi_ut_get_type_name(type)));
344 * Print a dot for each object unless we are going to print the entire
345 * pathname
347 if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
348 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
352 * We ignore errors from above, and always return OK, since we don't want
353 * to abort the walk on any single error.
355 acpi_ex_exit_interpreter();
356 return (AE_OK);
359 /*******************************************************************************
361 * FUNCTION: acpi_ns_find_ini_methods
363 * PARAMETERS: acpi_walk_callback
365 * RETURN: acpi_status
367 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
368 * device/processor/thermal objects, and marks the entire subtree
369 * with a SUBTREE_HAS_INI flag. This flag is used during the
370 * subsequent device initialization walk to avoid entire subtrees
371 * that do not contain an _INI.
373 ******************************************************************************/
375 static acpi_status
376 acpi_ns_find_ini_methods(acpi_handle obj_handle,
377 u32 nesting_level, void *context, void **return_value)
379 struct acpi_device_walk_info *info =
380 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
381 struct acpi_namespace_node *node;
382 struct acpi_namespace_node *parent_node;
384 /* Keep count of device/processor/thermal objects */
386 node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
387 if ((node->type == ACPI_TYPE_DEVICE) ||
388 (node->type == ACPI_TYPE_PROCESSOR) ||
389 (node->type == ACPI_TYPE_THERMAL)) {
390 info->device_count++;
391 return (AE_OK);
394 /* We are only looking for methods named _INI */
396 if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
397 return (AE_OK);
401 * The only _INI methods that we care about are those that are
402 * present under Device, Processor, and Thermal objects.
404 parent_node = acpi_ns_get_parent_node(node);
405 switch (parent_node->type) {
406 case ACPI_TYPE_DEVICE:
407 case ACPI_TYPE_PROCESSOR:
408 case ACPI_TYPE_THERMAL:
410 /* Mark parent and bubble up the INI present flag to the root */
412 while (parent_node) {
413 parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
414 parent_node = acpi_ns_get_parent_node(parent_node);
416 break;
418 default:
419 break;
422 return (AE_OK);
425 /*******************************************************************************
427 * FUNCTION: acpi_ns_init_one_device
429 * PARAMETERS: acpi_walk_callback
431 * RETURN: acpi_status
433 * DESCRIPTION: This is called once per device soon after ACPI is enabled
434 * to initialize each device. It determines if the device is
435 * present, and if so, calls _INI.
437 ******************************************************************************/
439 static acpi_status
440 acpi_ns_init_one_device(acpi_handle obj_handle,
441 u32 nesting_level, void *context, void **return_value)
443 struct acpi_device_walk_info *walk_info =
444 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
445 struct acpi_evaluate_info *info = walk_info->evaluate_info;
446 u32 flags;
447 acpi_status status;
448 struct acpi_namespace_node *device_node;
450 ACPI_FUNCTION_TRACE(ns_init_one_device);
452 /* We are interested in Devices, Processors and thermal_zones only */
454 device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
455 if ((device_node->type != ACPI_TYPE_DEVICE) &&
456 (device_node->type != ACPI_TYPE_PROCESSOR) &&
457 (device_node->type != ACPI_TYPE_THERMAL)) {
458 return_ACPI_STATUS(AE_OK);
462 * Because of an earlier namespace analysis, all subtrees that contain an
463 * _INI method are tagged.
465 * If this device subtree does not contain any _INI methods, we
466 * can exit now and stop traversing this entire subtree.
468 if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
469 return_ACPI_STATUS(AE_CTRL_DEPTH);
473 * Run _STA to determine if this device is present and functioning. We
474 * must know this information for two important reasons (from ACPI spec):
476 * 1) We can only run _INI if the device is present.
477 * 2) We must abort the device tree walk on this subtree if the device is
478 * not present and is not functional (we will not examine the children)
480 * The _STA method is not required to be present under the device, we
481 * assume the device is present if _STA does not exist.
483 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
484 (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
486 status = acpi_ut_execute_STA(device_node, &flags);
487 if (ACPI_FAILURE(status)) {
489 /* Ignore error and move on to next device */
491 return_ACPI_STATUS(AE_OK);
495 * Flags == -1 means that _STA was not found. In this case, we assume that
496 * the device is both present and functional.
498 * From the ACPI spec, description of _STA:
500 * "If a device object (including the processor object) does not have an
501 * _STA object, then OSPM assumes that all of the above bits are set (in
502 * other words, the device is present, ..., and functioning)"
504 if (flags != ACPI_UINT32_MAX) {
505 walk_info->num_STA++;
509 * Examine the PRESENT and FUNCTIONING status bits
511 * Note: ACPI spec does not seem to specify behavior for the present but
512 * not functioning case, so we assume functioning if present.
514 if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
516 /* Device is not present, we must examine the Functioning bit */
518 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
520 * Device is not present but is "functioning". In this case,
521 * we will not run _INI, but we continue to examine the children
522 * of this device.
524 * From the ACPI spec, description of _STA: (Note - no mention
525 * of whether to run _INI or not on the device in question)
527 * "_STA may return bit 0 clear (not present) with bit 3 set
528 * (device is functional). This case is used to indicate a valid
529 * device for which no device driver should be loaded (for example,
530 * a bridge device.) Children of this device may be present and
531 * valid. OSPM should continue enumeration below a device whose
532 * _STA returns this bit combination"
534 return_ACPI_STATUS(AE_OK);
535 } else {
537 * Device is not present and is not functioning. We must abort the
538 * walk of this subtree immediately -- don't look at the children
539 * of such a device.
541 * From the ACPI spec, description of _INI:
543 * "If the _STA method indicates that the device is not present,
544 * OSPM will not run the _INI and will not examine the children
545 * of the device for _INI methods"
547 return_ACPI_STATUS(AE_CTRL_DEPTH);
552 * The device is present or is assumed present if no _STA exists.
553 * Run the _INI if it exists (not required to exist)
555 * Note: We know there is an _INI within this subtree, but it may not be
556 * under this particular device, it may be lower in the branch.
558 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
559 (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
561 info->prefix_node = device_node;
562 info->pathname = METHOD_NAME__INI;
563 info->parameters = NULL;
564 info->flags = ACPI_IGNORE_RETURN_VALUE;
567 * Some hardware relies on this being executed as atomically
568 * as possible (without an NMI being received in the middle of
569 * this) - so disable NMIs and initialize the device:
571 acpi_nmi_disable();
572 status = acpi_ns_evaluate(info);
573 acpi_nmi_enable();
575 if (ACPI_SUCCESS(status)) {
576 walk_info->num_INI++;
578 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
579 (!(acpi_dbg_level & ACPI_LV_INFO))) {
580 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
583 #ifdef ACPI_DEBUG_OUTPUT
584 else if (status != AE_NOT_FOUND) {
586 /* Ignore error and move on to next device */
588 char *scope_name =
589 acpi_ns_get_external_pathname(info->resolved_node);
591 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
592 scope_name));
593 ACPI_FREE(scope_name);
595 #endif
597 /* Ignore errors from above */
599 status = AE_OK;
602 * The _INI method has been run if present; call the Global Initialization
603 * Handler for this device.
605 if (acpi_gbl_init_handler) {
606 status =
607 acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
610 return_ACPI_STATUS(status);