Merge branch 'acpi-lpss' into acpi-cleanup
[linux-3.10.git] / drivers / acpi / bus.c
1 /*
2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3  *
4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5  *
6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or (at
11  *  your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful, but
14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  *  General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License along
19  *  with this program; if not, write to the Free Software Foundation, Inc.,
20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21  *
22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23  */
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/kernel.h>
29 #include <linux/list.h>
30 #include <linux/sched.h>
31 #include <linux/pm.h>
32 #include <linux/device.h>
33 #include <linux/proc_fs.h>
34 #include <linux/acpi.h>
35 #include <linux/slab.h>
36 #ifdef CONFIG_X86
37 #include <asm/mpspec.h>
38 #endif
39 #include <linux/pci.h>
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42 #include <acpi/apei.h>
43 #include <linux/dmi.h>
44 #include <linux/suspend.h>
45
46 #include "internal.h"
47
48 #define _COMPONENT              ACPI_BUS_COMPONENT
49 ACPI_MODULE_NAME("bus");
50
51 struct acpi_device *acpi_root;
52 struct proc_dir_entry *acpi_root_dir;
53 EXPORT_SYMBOL(acpi_root_dir);
54
55 #define STRUCT_TO_INT(s)        (*((int*)&s))
56
57
58 #ifdef CONFIG_X86
59 static int set_copy_dsdt(const struct dmi_system_id *id)
60 {
61         printk(KERN_NOTICE "%s detected - "
62                 "force copy of DSDT to local memory\n", id->ident);
63         acpi_gbl_copy_dsdt_locally = 1;
64         return 0;
65 }
66
67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
68         /*
69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
71          */
72         {
73          .callback = set_copy_dsdt,
74          .ident = "TOSHIBA Satellite",
75          .matches = {
76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
78                 },
79         },
80         {}
81 };
82 #else
83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
84         {}
85 };
86 #endif
87
88 /* --------------------------------------------------------------------------
89                                 Device Management
90    -------------------------------------------------------------------------- */
91
92 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
93 {
94         acpi_status status = AE_OK;
95
96
97         if (!device)
98                 return -EINVAL;
99
100         /* TBD: Support fixed-feature devices */
101
102         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
103         if (ACPI_FAILURE(status) || !*device) {
104                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
105                                   handle));
106                 return -ENODEV;
107         }
108
109         return 0;
110 }
111
112 EXPORT_SYMBOL(acpi_bus_get_device);
113
114 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
115                                        unsigned long long *sta)
116 {
117         acpi_status status;
118
119         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
120         if (ACPI_SUCCESS(status))
121                 return AE_OK;
122
123         if (status == AE_NOT_FOUND) {
124                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
125                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
126                 return AE_OK;
127         }
128         return status;
129 }
130
131 int acpi_bus_get_status(struct acpi_device *device)
132 {
133         acpi_status status;
134         unsigned long long sta;
135
136         status = acpi_bus_get_status_handle(device->handle, &sta);
137         if (ACPI_FAILURE(status))
138                 return -ENODEV;
139
140         STRUCT_TO_INT(device->status) = (int) sta;
141
142         if (device->status.functional && !device->status.present) {
143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
144                        "functional but not present;\n",
145                         device->pnp.bus_id,
146                         (u32) STRUCT_TO_INT(device->status)));
147         }
148
149         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
150                           device->pnp.bus_id,
151                           (u32) STRUCT_TO_INT(device->status)));
152         return 0;
153 }
154 EXPORT_SYMBOL(acpi_bus_get_status);
155
156 void acpi_bus_private_data_handler(acpi_handle handle,
157                                    void *context)
158 {
159         return;
160 }
161 EXPORT_SYMBOL(acpi_bus_private_data_handler);
162
163 int acpi_bus_get_private_data(acpi_handle handle, void **data)
164 {
165         acpi_status status = AE_OK;
166
167         if (!*data)
168                 return -EINVAL;
169
170         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
171         if (ACPI_FAILURE(status) || !*data) {
172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
173                                 handle));
174                 return -ENODEV;
175         }
176
177         return 0;
178 }
179 EXPORT_SYMBOL(acpi_bus_get_private_data);
180
181 static void acpi_print_osc_error(acpi_handle handle,
182         struct acpi_osc_context *context, char *error)
183 {
184         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
185         int i;
186
187         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
188                 printk(KERN_DEBUG "%s\n", error);
189         else {
190                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
191                 kfree(buffer.pointer);
192         }
193         printk(KERN_DEBUG"_OSC request data:");
194         for (i = 0; i < context->cap.length; i += sizeof(u32))
195                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
196         printk("\n");
197 }
198
199 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
200 {
201         int i;
202         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
203                 24, 26, 28, 30, 32, 34};
204
205         if (strlen(str) != 36)
206                 return AE_BAD_PARAMETER;
207         for (i = 0; i < 36; i++) {
208                 if (i == 8 || i == 13 || i == 18 || i == 23) {
209                         if (str[i] != '-')
210                                 return AE_BAD_PARAMETER;
211                 } else if (!isxdigit(str[i]))
212                         return AE_BAD_PARAMETER;
213         }
214         for (i = 0; i < 16; i++) {
215                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
216                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
217         }
218         return AE_OK;
219 }
220
221 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
222 {
223         acpi_status status;
224         struct acpi_object_list input;
225         union acpi_object in_params[4];
226         union acpi_object *out_obj;
227         u8 uuid[16];
228         u32 errors;
229         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
230
231         if (!context)
232                 return AE_ERROR;
233         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
234                 return AE_ERROR;
235         context->ret.length = ACPI_ALLOCATE_BUFFER;
236         context->ret.pointer = NULL;
237
238         /* Setting up input parameters */
239         input.count = 4;
240         input.pointer = in_params;
241         in_params[0].type               = ACPI_TYPE_BUFFER;
242         in_params[0].buffer.length      = 16;
243         in_params[0].buffer.pointer     = uuid;
244         in_params[1].type               = ACPI_TYPE_INTEGER;
245         in_params[1].integer.value      = context->rev;
246         in_params[2].type               = ACPI_TYPE_INTEGER;
247         in_params[2].integer.value      = context->cap.length/sizeof(u32);
248         in_params[3].type               = ACPI_TYPE_BUFFER;
249         in_params[3].buffer.length      = context->cap.length;
250         in_params[3].buffer.pointer     = context->cap.pointer;
251
252         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
253         if (ACPI_FAILURE(status))
254                 return status;
255
256         if (!output.length)
257                 return AE_NULL_OBJECT;
258
259         out_obj = output.pointer;
260         if (out_obj->type != ACPI_TYPE_BUFFER
261                 || out_obj->buffer.length != context->cap.length) {
262                 acpi_print_osc_error(handle, context,
263                         "_OSC evaluation returned wrong type");
264                 status = AE_TYPE;
265                 goto out_kfree;
266         }
267         /* Need to ignore the bit0 in result code */
268         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
269         if (errors) {
270                 if (errors & OSC_REQUEST_ERROR)
271                         acpi_print_osc_error(handle, context,
272                                 "_OSC request failed");
273                 if (errors & OSC_INVALID_UUID_ERROR)
274                         acpi_print_osc_error(handle, context,
275                                 "_OSC invalid UUID");
276                 if (errors & OSC_INVALID_REVISION_ERROR)
277                         acpi_print_osc_error(handle, context,
278                                 "_OSC invalid revision");
279                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
280                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
281                             & OSC_QUERY_ENABLE)
282                                 goto out_success;
283                         status = AE_SUPPORT;
284                         goto out_kfree;
285                 }
286                 status = AE_ERROR;
287                 goto out_kfree;
288         }
289 out_success:
290         context->ret.length = out_obj->buffer.length;
291         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
292         if (!context->ret.pointer) {
293                 status =  AE_NO_MEMORY;
294                 goto out_kfree;
295         }
296         memcpy(context->ret.pointer, out_obj->buffer.pointer,
297                 context->ret.length);
298         status =  AE_OK;
299
300 out_kfree:
301         kfree(output.pointer);
302         if (status != AE_OK)
303                 context->ret.pointer = NULL;
304         return status;
305 }
306 EXPORT_SYMBOL(acpi_run_osc);
307
308 bool osc_sb_apei_support_acked;
309 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
310 static void acpi_bus_osc_support(void)
311 {
312         u32 capbuf[2];
313         struct acpi_osc_context context = {
314                 .uuid_str = sb_uuid_str,
315                 .rev = 1,
316                 .cap.length = 8,
317                 .cap.pointer = capbuf,
318         };
319         acpi_handle handle;
320
321         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
322         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
323 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
324                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
325         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
326 #endif
327
328 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
329         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
330 #endif
331
332 #ifdef ACPI_HOTPLUG_OST
333         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
334 #endif
335
336         if (!ghes_disable)
337                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
338         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
339                 return;
340         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
341                 u32 *capbuf_ret = context.ret.pointer;
342                 if (context.ret.length > OSC_SUPPORT_TYPE)
343                         osc_sb_apei_support_acked =
344                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
345                 kfree(context.ret.pointer);
346         }
347         /* do we need to check other returned cap? Sounds no */
348 }
349
350 /* --------------------------------------------------------------------------
351                                 Event Management
352    -------------------------------------------------------------------------- */
353
354 #ifdef CONFIG_ACPI_PROC_EVENT
355 static DEFINE_SPINLOCK(acpi_bus_event_lock);
356
357 LIST_HEAD(acpi_bus_event_list);
358 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
359
360 extern int event_is_open;
361
362 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
363 {
364         struct acpi_bus_event *event;
365         unsigned long flags = 0;
366
367         /* drop event on the floor if no one's listening */
368         if (!event_is_open)
369                 return 0;
370
371         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
372         if (!event)
373                 return -ENOMEM;
374
375         strcpy(event->device_class, device_class);
376         strcpy(event->bus_id, bus_id);
377         event->type = type;
378         event->data = data;
379
380         spin_lock_irqsave(&acpi_bus_event_lock, flags);
381         list_add_tail(&event->node, &acpi_bus_event_list);
382         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
383
384         wake_up_interruptible(&acpi_bus_event_queue);
385
386         return 0;
387
388 }
389
390 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
391
392 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
393 {
394         if (!device)
395                 return -EINVAL;
396         return acpi_bus_generate_proc_event4(device->pnp.device_class,
397                                              device->pnp.bus_id, type, data);
398 }
399
400 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
401
402 int acpi_bus_receive_event(struct acpi_bus_event *event)
403 {
404         unsigned long flags = 0;
405         struct acpi_bus_event *entry = NULL;
406
407         DECLARE_WAITQUEUE(wait, current);
408
409
410         if (!event)
411                 return -EINVAL;
412
413         if (list_empty(&acpi_bus_event_list)) {
414
415                 set_current_state(TASK_INTERRUPTIBLE);
416                 add_wait_queue(&acpi_bus_event_queue, &wait);
417
418                 if (list_empty(&acpi_bus_event_list))
419                         schedule();
420
421                 remove_wait_queue(&acpi_bus_event_queue, &wait);
422                 set_current_state(TASK_RUNNING);
423
424                 if (signal_pending(current))
425                         return -ERESTARTSYS;
426         }
427
428         spin_lock_irqsave(&acpi_bus_event_lock, flags);
429         if (!list_empty(&acpi_bus_event_list)) {
430                 entry = list_entry(acpi_bus_event_list.next,
431                                    struct acpi_bus_event, node);
432                 list_del(&entry->node);
433         }
434         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
435
436         if (!entry)
437                 return -ENODEV;
438
439         memcpy(event, entry, sizeof(struct acpi_bus_event));
440
441         kfree(entry);
442
443         return 0;
444 }
445
446 #endif  /* CONFIG_ACPI_PROC_EVENT */
447
448 /* --------------------------------------------------------------------------
449                              Notification Handling
450    -------------------------------------------------------------------------- */
451
452 static void acpi_bus_check_device(acpi_handle handle)
453 {
454         struct acpi_device *device;
455         acpi_status status;
456         struct acpi_device_status old_status;
457
458         if (acpi_bus_get_device(handle, &device))
459                 return;
460         if (!device)
461                 return;
462
463         old_status = device->status;
464
465         /*
466          * Make sure this device's parent is present before we go about
467          * messing with the device.
468          */
469         if (device->parent && !device->parent->status.present) {
470                 device->status = device->parent->status;
471                 return;
472         }
473
474         status = acpi_bus_get_status(device);
475         if (ACPI_FAILURE(status))
476                 return;
477
478         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
479                 return;
480
481         /*
482          * Device Insertion/Removal
483          */
484         if ((device->status.present) && !(old_status.present)) {
485                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
486                 /* TBD: Handle device insertion */
487         } else if (!(device->status.present) && (old_status.present)) {
488                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
489                 /* TBD: Handle device removal */
490         }
491 }
492
493 static void acpi_bus_check_scope(acpi_handle handle)
494 {
495         /* Status Change? */
496         acpi_bus_check_device(handle);
497
498         /*
499          * TBD: Enumerate child devices within this device's scope and
500          *       run acpi_bus_check_device()'s on them.
501          */
502 }
503
504 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
505 int register_acpi_bus_notifier(struct notifier_block *nb)
506 {
507         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
508 }
509 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
510
511 void unregister_acpi_bus_notifier(struct notifier_block *nb)
512 {
513         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
514 }
515 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
516
517 /**
518  * acpi_bus_notify
519  * ---------------
520  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
521  */
522 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
523 {
524         struct acpi_device *device = NULL;
525         struct acpi_driver *driver;
526
527         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
528                           type, handle));
529
530         blocking_notifier_call_chain(&acpi_bus_notify_list,
531                 type, (void *)handle);
532
533         switch (type) {
534
535         case ACPI_NOTIFY_BUS_CHECK:
536                 acpi_bus_check_scope(handle);
537                 /*
538                  * TBD: We'll need to outsource certain events to non-ACPI
539                  *      drivers via the device manager (device.c).
540                  */
541                 break;
542
543         case ACPI_NOTIFY_DEVICE_CHECK:
544                 acpi_bus_check_device(handle);
545                 /*
546                  * TBD: We'll need to outsource certain events to non-ACPI
547                  *      drivers via the device manager (device.c).
548                  */
549                 break;
550
551         case ACPI_NOTIFY_DEVICE_WAKE:
552                 /* TBD */
553                 break;
554
555         case ACPI_NOTIFY_EJECT_REQUEST:
556                 /* TBD */
557                 break;
558
559         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
560                 /* TBD: Exactly what does 'light' mean? */
561                 break;
562
563         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
564                 /* TBD */
565                 break;
566
567         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
568                 /* TBD */
569                 break;
570
571         case ACPI_NOTIFY_POWER_FAULT:
572                 /* TBD */
573                 break;
574
575         default:
576                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
577                                   "Received unknown/unsupported notification [%08x]\n",
578                                   type));
579                 break;
580         }
581
582         acpi_bus_get_device(handle, &device);
583         if (device) {
584                 driver = device->driver;
585                 if (driver && driver->ops.notify &&
586                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
587                         driver->ops.notify(device, type);
588         }
589 }
590
591 /* --------------------------------------------------------------------------
592                              Initialization/Cleanup
593    -------------------------------------------------------------------------- */
594
595 static int __init acpi_bus_init_irq(void)
596 {
597         acpi_status status = AE_OK;
598         union acpi_object arg = { ACPI_TYPE_INTEGER };
599         struct acpi_object_list arg_list = { 1, &arg };
600         char *message = NULL;
601
602
603         /*
604          * Let the system know what interrupt model we are using by
605          * evaluating the \_PIC object, if exists.
606          */
607
608         switch (acpi_irq_model) {
609         case ACPI_IRQ_MODEL_PIC:
610                 message = "PIC";
611                 break;
612         case ACPI_IRQ_MODEL_IOAPIC:
613                 message = "IOAPIC";
614                 break;
615         case ACPI_IRQ_MODEL_IOSAPIC:
616                 message = "IOSAPIC";
617                 break;
618         case ACPI_IRQ_MODEL_PLATFORM:
619                 message = "platform specific model";
620                 break;
621         default:
622                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
623                 return -ENODEV;
624         }
625
626         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
627
628         arg.integer.value = acpi_irq_model;
629
630         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
631         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
632                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
633                 return -ENODEV;
634         }
635
636         return 0;
637 }
638
639 u8 acpi_gbl_permanent_mmap;
640
641
642 void __init acpi_early_init(void)
643 {
644         acpi_status status = AE_OK;
645
646         if (acpi_disabled)
647                 return;
648
649         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
650
651         /* enable workarounds, unless strict ACPI spec. compliance */
652         if (!acpi_strict)
653                 acpi_gbl_enable_interpreter_slack = TRUE;
654
655         acpi_gbl_permanent_mmap = 1;
656
657         /*
658          * If the machine falls into the DMI check table,
659          * DSDT will be copied to memory
660          */
661         dmi_check_system(dsdt_dmi_table);
662
663         status = acpi_reallocate_root_table();
664         if (ACPI_FAILURE(status)) {
665                 printk(KERN_ERR PREFIX
666                        "Unable to reallocate ACPI tables\n");
667                 goto error0;
668         }
669
670         status = acpi_initialize_subsystem();
671         if (ACPI_FAILURE(status)) {
672                 printk(KERN_ERR PREFIX
673                        "Unable to initialize the ACPI Interpreter\n");
674                 goto error0;
675         }
676
677         status = acpi_load_tables();
678         if (ACPI_FAILURE(status)) {
679                 printk(KERN_ERR PREFIX
680                        "Unable to load the System Description Tables\n");
681                 goto error0;
682         }
683
684 #ifdef CONFIG_X86
685         if (!acpi_ioapic) {
686                 /* compatible (0) means level (3) */
687                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
688                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
689                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
690                 }
691                 /* Set PIC-mode SCI trigger type */
692                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
693                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
694         } else {
695                 /*
696                  * now that acpi_gbl_FADT is initialized,
697                  * update it with result from INT_SRC_OVR parsing
698                  */
699                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
700         }
701 #endif
702
703         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
704         if (ACPI_FAILURE(status)) {
705                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
706                 goto error0;
707         }
708
709         return;
710
711       error0:
712         disable_acpi();
713         return;
714 }
715
716 static int __init acpi_bus_init(void)
717 {
718         int result = 0;
719         acpi_status status = AE_OK;
720         extern acpi_status acpi_os_initialize1(void);
721
722         acpi_os_initialize1();
723
724         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
725         if (ACPI_FAILURE(status)) {
726                 printk(KERN_ERR PREFIX
727                        "Unable to start the ACPI Interpreter\n");
728                 goto error1;
729         }
730
731         /*
732          * ACPI 2.0 requires the EC driver to be loaded and work before
733          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
734          * is called).
735          *
736          * This is accomplished by looking for the ECDT table, and getting
737          * the EC parameters out of that.
738          */
739         status = acpi_ec_ecdt_probe();
740         /* Ignore result. Not having an ECDT is not fatal. */
741
742         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
743         if (ACPI_FAILURE(status)) {
744                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
745                 goto error1;
746         }
747
748         /*
749          * _OSC method may exist in module level code,
750          * so it must be run after ACPI_FULL_INITIALIZATION
751          */
752         acpi_bus_osc_support();
753
754         /*
755          * _PDC control method may load dynamic SSDT tables,
756          * and we need to install the table handler before that.
757          */
758         acpi_sysfs_init();
759
760         acpi_early_processor_set_pdc();
761
762         /*
763          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
764          * is necessary to enable it as early as possible.
765          */
766         acpi_boot_ec_enable();
767
768         printk(KERN_INFO PREFIX "Interpreter enabled\n");
769
770         /* Initialize sleep structures */
771         acpi_sleep_init();
772
773         /*
774          * Get the system interrupt model and evaluate \_PIC.
775          */
776         result = acpi_bus_init_irq();
777         if (result)
778                 goto error1;
779
780         /*
781          * Register the for all standard device notifications.
782          */
783         status =
784             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
785                                         &acpi_bus_notify, NULL);
786         if (ACPI_FAILURE(status)) {
787                 printk(KERN_ERR PREFIX
788                        "Unable to register for device notifications\n");
789                 goto error1;
790         }
791
792         /*
793          * Create the top ACPI proc directory
794          */
795         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
796
797         return 0;
798
799         /* Mimic structured exception handling */
800       error1:
801         acpi_terminate();
802         return -ENODEV;
803 }
804
805 struct kobject *acpi_kobj;
806 EXPORT_SYMBOL_GPL(acpi_kobj);
807
808 static int __init acpi_init(void)
809 {
810         int result;
811
812         if (acpi_disabled) {
813                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
814                 return -ENODEV;
815         }
816
817         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
818         if (!acpi_kobj) {
819                 printk(KERN_WARNING "%s: kset create error\n", __func__);
820                 acpi_kobj = NULL;
821         }
822
823         init_acpi_device_notify();
824         result = acpi_bus_init();
825         if (result) {
826                 disable_acpi();
827                 return result;
828         }
829
830         pci_mmcfg_late_init();
831         acpi_scan_init();
832         acpi_ec_init();
833         acpi_debugfs_init();
834         acpi_sleep_proc_init();
835         acpi_wakeup_device_init();
836         return 0;
837 }
838
839 subsys_initcall(acpi_init);