Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / nsinit.c
1 /******************************************************************************
2  *
3  * Module Name: nsinit - namespace initialization
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, 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 "acnamesp.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include <linux/nmi.h>
50
51 #define _COMPONENT          ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nsinit")
53
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);
58
59 static acpi_status
60 acpi_ns_init_one_device(acpi_handle obj_handle,
61                         u32 nesting_level, void *context, void **return_value);
62
63 static acpi_status
64 acpi_ns_find_ini_methods(acpi_handle obj_handle,
65                          u32 nesting_level, void *context, void **return_value);
66
67 /*******************************************************************************
68  *
69  * FUNCTION:    acpi_ns_initialize_objects
70  *
71  * PARAMETERS:  None
72  *
73  * RETURN:      Status
74  *
75  * DESCRIPTION: Walk the entire namespace and perform any necessary
76  *              initialization on the objects found therein
77  *
78  ******************************************************************************/
79
80 acpi_status acpi_ns_initialize_objects(void)
81 {
82         acpi_status status;
83         struct acpi_init_walk_info info;
84
85         ACPI_FUNCTION_TRACE(ns_initialize_objects);
86
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:"));
91
92         /* Set all init info to zero */
93
94         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
95
96         /* Walk entire namespace from the supplied root */
97
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"));
103         }
104
105         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
106                               "\nInitialized %u/%u Regions %u/%u Fields %u/%u "
107                               "Buffers %u/%u Packages (%u 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));
113
114         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
115                           "%u Control Methods found\n", info.method_count));
116         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
117                           "%u Op Regions found\n", info.op_region_count));
118
119         return_ACPI_STATUS(AE_OK);
120 }
121
122 /*******************************************************************************
123  *
124  * FUNCTION:    acpi_ns_initialize_devices
125  *
126  * PARAMETERS:  None
127  *
128  * RETURN:      acpi_status
129  *
130  * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
131  *              This means running _INI on all present devices.
132  *
133  *              Note: We install PCI config space handler on region access,
134  *              not here.
135  *
136  ******************************************************************************/
137
138 acpi_status acpi_ns_initialize_devices(void)
139 {
140         acpi_status status;
141         struct acpi_device_walk_info info;
142
143         ACPI_FUNCTION_TRACE(ns_initialize_devices);
144
145         /* Init counters */
146
147         info.device_count = 0;
148         info.num_STA = 0;
149         info.num_INI = 0;
150
151         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
152                               "Initializing Device/Processor/Thermal objects "
153                               "by executing _INI methods:"));
154
155         /* Tree analysis: find all subtrees that contain _INI methods */
156
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;
163         }
164
165         /* Allocate the evaluation information block */
166
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;
172         }
173
174         /*
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.
178          */
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;
183
184         status = acpi_ns_evaluate(info.evaluate_info);
185         if (ACPI_SUCCESS(status)) {
186                 info.num_INI++;
187         }
188
189         /* Walk namespace to execute all _INIs on present devices */
190
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);
195
196         /*
197          * Any _OSI requests should be completed by now. If the BIOS has
198          * requested any Windows OSI strings, we will always truncate
199          * I/O addresses to 16 bits -- for Windows compatibility.
200          */
201         if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) {
202                 acpi_gbl_truncate_io_addresses = TRUE;
203         }
204
205         ACPI_FREE(info.evaluate_info);
206         if (ACPI_FAILURE(status)) {
207                 goto error_exit;
208         }
209
210         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
211                               "\nExecuted %u _INI methods requiring %u _STA executions "
212                               "(examined %u objects)\n",
213                               info.num_INI, info.num_STA, info.device_count));
214
215         return_ACPI_STATUS(status);
216
217       error_exit:
218         ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
219         return_ACPI_STATUS(status);
220 }
221
222 /*******************************************************************************
223  *
224  * FUNCTION:    acpi_ns_init_one_object
225  *
226  * PARAMETERS:  obj_handle      - Node
227  *              Level           - Current nesting level
228  *              Context         - Points to a init info struct
229  *              return_value    - Not used
230  *
231  * RETURN:      Status
232  *
233  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
234  *              within the  namespace.
235  *
236  *              Currently, the only objects that require initialization are:
237  *              1) Methods
238  *              2) Op Regions
239  *
240  ******************************************************************************/
241
242 static acpi_status
243 acpi_ns_init_one_object(acpi_handle obj_handle,
244                         u32 level, void *context, void **return_value)
245 {
246         acpi_object_type type;
247         acpi_status status = AE_OK;
248         struct acpi_init_walk_info *info =
249             (struct acpi_init_walk_info *)context;
250         struct acpi_namespace_node *node =
251             (struct acpi_namespace_node *)obj_handle;
252         union acpi_operand_object *obj_desc;
253
254         ACPI_FUNCTION_NAME(ns_init_one_object);
255
256         info->object_count++;
257
258         /* And even then, we are only interested in a few object types */
259
260         type = acpi_ns_get_type(obj_handle);
261         obj_desc = acpi_ns_get_attached_object(node);
262         if (!obj_desc) {
263                 return (AE_OK);
264         }
265
266         /* Increment counters for object types we are looking for */
267
268         switch (type) {
269         case ACPI_TYPE_REGION:
270                 info->op_region_count++;
271                 break;
272
273         case ACPI_TYPE_BUFFER_FIELD:
274                 info->field_count++;
275                 break;
276
277         case ACPI_TYPE_LOCAL_BANK_FIELD:
278                 info->field_count++;
279                 break;
280
281         case ACPI_TYPE_BUFFER:
282                 info->buffer_count++;
283                 break;
284
285         case ACPI_TYPE_PACKAGE:
286                 info->package_count++;
287                 break;
288
289         default:
290
291                 /* No init required, just exit now */
292                 return (AE_OK);
293         }
294
295         /* If the object is already initialized, nothing else to do */
296
297         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
298                 return (AE_OK);
299         }
300
301         /* Must lock the interpreter before executing AML code */
302
303         acpi_ex_enter_interpreter();
304
305         /*
306          * Each of these types can contain executable AML code within the
307          * declaration.
308          */
309         switch (type) {
310         case ACPI_TYPE_REGION:
311
312                 info->op_region_init++;
313                 status = acpi_ds_get_region_arguments(obj_desc);
314                 break;
315
316         case ACPI_TYPE_BUFFER_FIELD:
317
318                 info->field_init++;
319                 status = acpi_ds_get_buffer_field_arguments(obj_desc);
320                 break;
321
322         case ACPI_TYPE_LOCAL_BANK_FIELD:
323
324                 info->field_init++;
325                 status = acpi_ds_get_bank_field_arguments(obj_desc);
326                 break;
327
328         case ACPI_TYPE_BUFFER:
329
330                 info->buffer_init++;
331                 status = acpi_ds_get_buffer_arguments(obj_desc);
332                 break;
333
334         case ACPI_TYPE_PACKAGE:
335
336                 info->package_init++;
337                 status = acpi_ds_get_package_arguments(obj_desc);
338                 break;
339
340         default:
341                 /* No other types can get here */
342                 break;
343         }
344
345         if (ACPI_FAILURE(status)) {
346                 ACPI_EXCEPTION((AE_INFO, status,
347                                 "Could not execute arguments for [%4.4s] (%s)",
348                                 acpi_ut_get_node_name(node),
349                                 acpi_ut_get_type_name(type)));
350         }
351
352         /*
353          * Print a dot for each object unless we are going to print the entire
354          * pathname
355          */
356         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
357                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
358         }
359
360         /*
361          * We ignore errors from above, and always return OK, since we don't want
362          * to abort the walk on any single error.
363          */
364         acpi_ex_exit_interpreter();
365         return (AE_OK);
366 }
367
368 /*******************************************************************************
369  *
370  * FUNCTION:    acpi_ns_find_ini_methods
371  *
372  * PARAMETERS:  acpi_walk_callback
373  *
374  * RETURN:      acpi_status
375  *
376  * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
377  *              device/processor/thermal objects, and marks the entire subtree
378  *              with a SUBTREE_HAS_INI flag. This flag is used during the
379  *              subsequent device initialization walk to avoid entire subtrees
380  *              that do not contain an _INI.
381  *
382  ******************************************************************************/
383
384 static acpi_status
385 acpi_ns_find_ini_methods(acpi_handle obj_handle,
386                          u32 nesting_level, void *context, void **return_value)
387 {
388         struct acpi_device_walk_info *info =
389             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
390         struct acpi_namespace_node *node;
391         struct acpi_namespace_node *parent_node;
392
393         /* Keep count of device/processor/thermal objects */
394
395         node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
396         if ((node->type == ACPI_TYPE_DEVICE) ||
397             (node->type == ACPI_TYPE_PROCESSOR) ||
398             (node->type == ACPI_TYPE_THERMAL)) {
399                 info->device_count++;
400                 return (AE_OK);
401         }
402
403         /* We are only looking for methods named _INI */
404
405         if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
406                 return (AE_OK);
407         }
408
409         /*
410          * The only _INI methods that we care about are those that are
411          * present under Device, Processor, and Thermal objects.
412          */
413         parent_node = node->parent;
414         switch (parent_node->type) {
415         case ACPI_TYPE_DEVICE:
416         case ACPI_TYPE_PROCESSOR:
417         case ACPI_TYPE_THERMAL:
418
419                 /* Mark parent and bubble up the INI present flag to the root */
420
421                 while (parent_node) {
422                         parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
423                         parent_node = parent_node->parent;
424                 }
425                 break;
426
427         default:
428                 break;
429         }
430
431         return (AE_OK);
432 }
433
434 /*******************************************************************************
435  *
436  * FUNCTION:    acpi_ns_init_one_device
437  *
438  * PARAMETERS:  acpi_walk_callback
439  *
440  * RETURN:      acpi_status
441  *
442  * DESCRIPTION: This is called once per device soon after ACPI is enabled
443  *              to initialize each device. It determines if the device is
444  *              present, and if so, calls _INI.
445  *
446  ******************************************************************************/
447
448 static acpi_status
449 acpi_ns_init_one_device(acpi_handle obj_handle,
450                         u32 nesting_level, void *context, void **return_value)
451 {
452         struct acpi_device_walk_info *walk_info =
453             ACPI_CAST_PTR(struct acpi_device_walk_info, context);
454         struct acpi_evaluate_info *info = walk_info->evaluate_info;
455         u32 flags;
456         acpi_status status;
457         struct acpi_namespace_node *device_node;
458
459         ACPI_FUNCTION_TRACE(ns_init_one_device);
460
461         /* We are interested in Devices, Processors and thermal_zones only */
462
463         device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
464         if ((device_node->type != ACPI_TYPE_DEVICE) &&
465             (device_node->type != ACPI_TYPE_PROCESSOR) &&
466             (device_node->type != ACPI_TYPE_THERMAL)) {
467                 return_ACPI_STATUS(AE_OK);
468         }
469
470         /*
471          * Because of an earlier namespace analysis, all subtrees that contain an
472          * _INI method are tagged.
473          *
474          * If this device subtree does not contain any _INI methods, we
475          * can exit now and stop traversing this entire subtree.
476          */
477         if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
478                 return_ACPI_STATUS(AE_CTRL_DEPTH);
479         }
480
481         /*
482          * Run _STA to determine if this device is present and functioning. We
483          * must know this information for two important reasons (from ACPI spec):
484          *
485          * 1) We can only run _INI if the device is present.
486          * 2) We must abort the device tree walk on this subtree if the device is
487          *    not present and is not functional (we will not examine the children)
488          *
489          * The _STA method is not required to be present under the device, we
490          * assume the device is present if _STA does not exist.
491          */
492         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
493                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
494
495         status = acpi_ut_execute_STA(device_node, &flags);
496         if (ACPI_FAILURE(status)) {
497
498                 /* Ignore error and move on to next device */
499
500                 return_ACPI_STATUS(AE_OK);
501         }
502
503         /*
504          * Flags == -1 means that _STA was not found. In this case, we assume that
505          * the device is both present and functional.
506          *
507          * From the ACPI spec, description of _STA:
508          *
509          * "If a device object (including the processor object) does not have an
510          * _STA object, then OSPM assumes that all of the above bits are set (in
511          * other words, the device is present, ..., and functioning)"
512          */
513         if (flags != ACPI_UINT32_MAX) {
514                 walk_info->num_STA++;
515         }
516
517         /*
518          * Examine the PRESENT and FUNCTIONING status bits
519          *
520          * Note: ACPI spec does not seem to specify behavior for the present but
521          * not functioning case, so we assume functioning if present.
522          */
523         if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
524
525                 /* Device is not present, we must examine the Functioning bit */
526
527                 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
528                         /*
529                          * Device is not present but is "functioning". In this case,
530                          * we will not run _INI, but we continue to examine the children
531                          * of this device.
532                          *
533                          * From the ACPI spec, description of _STA: (Note - no mention
534                          * of whether to run _INI or not on the device in question)
535                          *
536                          * "_STA may return bit 0 clear (not present) with bit 3 set
537                          * (device is functional). This case is used to indicate a valid
538                          * device for which no device driver should be loaded (for example,
539                          * a bridge device.) Children of this device may be present and
540                          * valid. OSPM should continue enumeration below a device whose
541                          * _STA returns this bit combination"
542                          */
543                         return_ACPI_STATUS(AE_OK);
544                 } else {
545                         /*
546                          * Device is not present and is not functioning. We must abort the
547                          * walk of this subtree immediately -- don't look at the children
548                          * of such a device.
549                          *
550                          * From the ACPI spec, description of _INI:
551                          *
552                          * "If the _STA method indicates that the device is not present,
553                          * OSPM will not run the _INI and will not examine the children
554                          * of the device for _INI methods"
555                          */
556                         return_ACPI_STATUS(AE_CTRL_DEPTH);
557                 }
558         }
559
560         /*
561          * The device is present or is assumed present if no _STA exists.
562          * Run the _INI if it exists (not required to exist)
563          *
564          * Note: We know there is an _INI within this subtree, but it may not be
565          * under this particular device, it may be lower in the branch.
566          */
567         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
568                         (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
569
570         info->prefix_node = device_node;
571         info->pathname = METHOD_NAME__INI;
572         info->parameters = NULL;
573         info->flags = ACPI_IGNORE_RETURN_VALUE;
574
575         /*
576          * Some hardware relies on this being executed as atomically
577          * as possible (without an NMI being received in the middle of
578          * this) - so disable NMIs and initialize the device:
579          */
580         status = acpi_ns_evaluate(info);
581
582         if (ACPI_SUCCESS(status)) {
583                 walk_info->num_INI++;
584
585                 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
586                     (!(acpi_dbg_level & ACPI_LV_INFO))) {
587                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
588                 }
589         }
590 #ifdef ACPI_DEBUG_OUTPUT
591         else if (status != AE_NOT_FOUND) {
592
593                 /* Ignore error and move on to next device */
594
595                 char *scope_name =
596                     acpi_ns_get_external_pathname(info->resolved_node);
597
598                 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
599                                 scope_name));
600                 ACPI_FREE(scope_name);
601         }
602 #endif
603
604         /* Ignore errors from above */
605
606         status = AE_OK;
607
608         /*
609          * The _INI method has been run if present; call the Global Initialization
610          * Handler for this device.
611          */
612         if (acpi_gbl_init_handler) {
613                 status =
614                     acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
615         }
616
617         return_ACPI_STATUS(status);
618 }