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Linux 4.1.16
[linux/fpc-iii.git] / drivers / acpi / pci_link.c
blobb09ad554430acaf0052c3f960cb212b96582e804
1 /*
2 * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 *
26 * TBD:
27 * 1. Support more than one IRQ resource entry per link device (index).
28 * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
29 * for IRQ management (e.g. start()->_SRS).
30 */
31
32 #include <linux/syscore_ops.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/types.h>
37 #include <linux/spinlock.h>
38 #include <linux/pm.h>
39 #include <linux/pci.h>
40 #include <linux/mutex.h>
41 #include <linux/slab.h>
42 #include <linux/acpi.h>
43
44 #include "internal.h"
45
46 #define _COMPONENT ACPI_PCI_COMPONENT
47 ACPI_MODULE_NAME("pci_link");
48 #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
49 #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
50 #define ACPI_PCI_LINK_FILE_INFO "info"
51 #define ACPI_PCI_LINK_FILE_STATUS "state"
52 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
53
54 static int acpi_pci_link_add(struct acpi_device *device,
55 const struct acpi_device_id *not_used);
56 static void acpi_pci_link_remove(struct acpi_device *device);
57
58 static const struct acpi_device_id link_device_ids[] = {
59 {"PNP0C0F", 0},
60 {"", 0},
61 };
62
63 static struct acpi_scan_handler pci_link_handler = {
64 .ids = link_device_ids,
65 .attach = acpi_pci_link_add,
66 .detach = acpi_pci_link_remove,
67 };
68
69 /*
70 * If a link is initialized, we never change its active and initialized
71 * later even the link is disable. Instead, we just repick the active irq
72 */
73 struct acpi_pci_link_irq {
74 u8 active; /* Current IRQ */
75 u8 triggering; /* All IRQs */
76 u8 polarity; /* All IRQs */
77 u8 resource_type;
78 u8 possible_count;
79 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
80 u8 initialized:1;
81 u8 reserved:7;
82 };
83
84 struct acpi_pci_link {
85 struct list_head list;
86 struct acpi_device *device;
87 struct acpi_pci_link_irq irq;
88 int refcnt;
89 };
90
91 static LIST_HEAD(acpi_link_list);
92 static DEFINE_MUTEX(acpi_link_lock);
93
94 /* --------------------------------------------------------------------------
95 PCI Link Device Management
96 -------------------------------------------------------------------------- */
97
98 /*
99 * set context (link) possible list from resource list
100 */
101 static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
102 void *context)
103 {
104 struct acpi_pci_link *link = context;
105 u32 i;
106
107 switch (resource->type) {
108 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
109 case ACPI_RESOURCE_TYPE_END_TAG:
110 return AE_OK;
111 case ACPI_RESOURCE_TYPE_IRQ:
112 {
113 struct acpi_resource_irq *p = &resource->data.irq;
114 if (!p || !p->interrupt_count) {
115 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
116 "Blank _PRS IRQ resource\n"));
117 return AE_OK;
118 }
119 for (i = 0;
120 (i < p->interrupt_count
121 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
122 if (!p->interrupts[i]) {
123 printk(KERN_WARNING PREFIX
124 "Invalid _PRS IRQ %d\n",
125 p->interrupts[i]);
126 continue;
127 }
128 link->irq.possible[i] = p->interrupts[i];
129 link->irq.possible_count++;
130 }
131 link->irq.triggering = p->triggering;
132 link->irq.polarity = p->polarity;
133 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
134 break;
135 }
136 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
137 {
138 struct acpi_resource_extended_irq *p =
139 &resource->data.extended_irq;
140 if (!p || !p->interrupt_count) {
141 printk(KERN_WARNING PREFIX
142 "Blank _PRS EXT IRQ resource\n");
143 return AE_OK;
144 }
145 for (i = 0;
146 (i < p->interrupt_count
147 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
148 if (!p->interrupts[i]) {
149 printk(KERN_WARNING PREFIX
150 "Invalid _PRS IRQ %d\n",
151 p->interrupts[i]);
152 continue;
153 }
154 link->irq.possible[i] = p->interrupts[i];
155 link->irq.possible_count++;
156 }
157 link->irq.triggering = p->triggering;
158 link->irq.polarity = p->polarity;
159 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
160 break;
161 }
162 default:
163 printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
164 resource->type);
165 return AE_OK;
166 }
167
168 return AE_CTRL_TERMINATE;
169 }
170
171 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
172 {
173 acpi_status status;
174
175 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
176 acpi_pci_link_check_possible, link);
177 if (ACPI_FAILURE(status)) {
178 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
179 return -ENODEV;
180 }
181
182 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
183 "Found %d possible IRQs\n",
184 link->irq.possible_count));
185
186 return 0;
187 }
188
189 static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
190 void *context)
191 {
192 int *irq = context;
193
194 switch (resource->type) {
195 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
196 case ACPI_RESOURCE_TYPE_END_TAG:
197 return AE_OK;
198 case ACPI_RESOURCE_TYPE_IRQ:
199 {
200 struct acpi_resource_irq *p = &resource->data.irq;
201 if (!p || !p->interrupt_count) {
202 /*
203 * IRQ descriptors may have no IRQ# bits set,
204 * particularly those those w/ _STA disabled
205 */
206 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
207 "Blank _CRS IRQ resource\n"));
208 return AE_OK;
209 }
210 *irq = p->interrupts[0];
211 break;
212 }
213 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
214 {
215 struct acpi_resource_extended_irq *p =
216 &resource->data.extended_irq;
217 if (!p || !p->interrupt_count) {
218 /*
219 * extended IRQ descriptors must
220 * return at least 1 IRQ
221 */
222 printk(KERN_WARNING PREFIX
223 "Blank _CRS EXT IRQ resource\n");
224 return AE_OK;
225 }
226 *irq = p->interrupts[0];
227 break;
228 }
229 break;
230 default:
231 printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
232 resource->type);
233 return AE_OK;
234 }
235
236 return AE_CTRL_TERMINATE;
237 }
238
239 /*
240 * Run _CRS and set link->irq.active
241 *
242 * return value:
243 * 0 - success
244 * !0 - failure
245 */
246 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
247 {
248 int result = 0;
249 acpi_status status;
250 int irq = 0;
251
252 link->irq.active = 0;
253
254 /* in practice, status disabled is meaningless, ignore it */
255 if (acpi_strict) {
256 /* Query _STA, set link->device->status */
257 result = acpi_bus_get_status(link->device);
258 if (result) {
259 printk(KERN_ERR PREFIX "Unable to read status\n");
260 goto end;
261 }
262
263 if (!link->device->status.enabled) {
264 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
265 return 0;
266 }
267 }
268
269 /*
270 * Query and parse _CRS to get the current IRQ assignment.
271 */
272
273 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
274 acpi_pci_link_check_current, &irq);
275 if (ACPI_FAILURE(status)) {
276 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
277 result = -ENODEV;
278 goto end;
279 }
280
281 if (acpi_strict && !irq) {
282 printk(KERN_ERR PREFIX "_CRS returned 0\n");
283 result = -ENODEV;
284 }
285
286 link->irq.active = irq;
287
288 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
289
290 end:
291 return result;
292 }
293
294 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
295 {
296 int result;
297 acpi_status status;
298 struct {
299 struct acpi_resource res;
300 struct acpi_resource end;
301 } *resource;
302 struct acpi_buffer buffer = { 0, NULL };
303
304 if (!irq)
305 return -EINVAL;
306
307 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
308 if (!resource)
309 return -ENOMEM;
310
311 buffer.length = sizeof(*resource) + 1;
312 buffer.pointer = resource;
313
314 switch (link->irq.resource_type) {
315 case ACPI_RESOURCE_TYPE_IRQ:
316 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
317 resource->res.length = sizeof(struct acpi_resource);
318 resource->res.data.irq.triggering = link->irq.triggering;
319 resource->res.data.irq.polarity =
320 link->irq.polarity;
321 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
322 resource->res.data.irq.sharable =
323 ACPI_EXCLUSIVE;
324 else
325 resource->res.data.irq.sharable = ACPI_SHARED;
326 resource->res.data.irq.interrupt_count = 1;
327 resource->res.data.irq.interrupts[0] = irq;
328 break;
329
330 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
331 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
332 resource->res.length = sizeof(struct acpi_resource);
333 resource->res.data.extended_irq.producer_consumer =
334 ACPI_CONSUMER;
335 resource->res.data.extended_irq.triggering =
336 link->irq.triggering;
337 resource->res.data.extended_irq.polarity =
338 link->irq.polarity;
339 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
340 resource->res.data.irq.sharable =
341 ACPI_EXCLUSIVE;
342 else
343 resource->res.data.irq.sharable = ACPI_SHARED;
344 resource->res.data.extended_irq.interrupt_count = 1;
345 resource->res.data.extended_irq.interrupts[0] = irq;
346 /* ignore resource_source, it's optional */
347 break;
348 default:
349 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
350 result = -EINVAL;
351 goto end;
352
353 }
354 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
355 resource->end.length = sizeof(struct acpi_resource);
356
357 /* Attempt to set the resource */
358 status = acpi_set_current_resources(link->device->handle, &buffer);
359
360 /* check for total failure */
361 if (ACPI_FAILURE(status)) {
362 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
363 result = -ENODEV;
364 goto end;
365 }
366
367 /* Query _STA, set device->status */
368 result = acpi_bus_get_status(link->device);
369 if (result) {
370 printk(KERN_ERR PREFIX "Unable to read status\n");
371 goto end;
372 }
373 if (!link->device->status.enabled) {
374 printk(KERN_WARNING PREFIX
375 "%s [%s] disabled and referenced, BIOS bug\n",
376 acpi_device_name(link->device),
377 acpi_device_bid(link->device));
378 }
379
380 /* Query _CRS, set link->irq.active */
381 result = acpi_pci_link_get_current(link);
382 if (result) {
383 goto end;
384 }
385
386 /*
387 * Is current setting not what we set?
388 * set link->irq.active
389 */
390 if (link->irq.active != irq) {
391 /*
392 * policy: when _CRS doesn't return what we just _SRS
393 * assume _SRS worked and override _CRS value.
394 */
395 printk(KERN_WARNING PREFIX
396 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
397 acpi_device_name(link->device),
398 acpi_device_bid(link->device), link->irq.active, irq);
399 link->irq.active = irq;
400 }
401
402 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
403
404 end:
405 kfree(resource);
406 return result;
407 }
408
409 /* --------------------------------------------------------------------------
410 PCI Link IRQ Management
411 -------------------------------------------------------------------------- */
412
413 /*
414 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
415 * Link Devices to move the PIRQs around to minimize sharing.
416 *
417 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
418 * that the BIOS has already set to active. This is necessary because
419 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
420 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
421 * even if acpi_irq_nobalance is set.
422 *
423 * A tables of penalties avoids directing PCI interrupts to well known
424 * ISA IRQs. Boot params are available to over-ride the default table:
425 *
426 * List interrupts that are free for PCI use.
427 * acpi_irq_pci=n[,m]
428 *
429 * List interrupts that should not be used for PCI:
430 * acpi_irq_isa=n[,m]
431 *
432 * Note that PCI IRQ routers have a list of possible IRQs,
433 * which may not include the IRQs this table says are available.
434 *
435 * Since this heuristic can't tell the difference between a link
436 * that no device will attach to, vs. a link which may be shared
437 * by multiple active devices -- it is not optimal.
438 *
439 * If interrupt performance is that important, get an IO-APIC system
440 * with a pin dedicated to each device. Or for that matter, an MSI
441 * enabled system.
442 */
443
444 #define ACPI_MAX_IRQS 256
445 #define ACPI_MAX_ISA_IRQ 16
446
447 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
448 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
449 #define PIRQ_PENALTY_PCI_USING (16*16*16)
450 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
451 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
452 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
453
454 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
455 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
456 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
457 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
458 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
459 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
460 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
461 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
462 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
463 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
464 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
465 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
466 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
467 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
468 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
469 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
470 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
471 /* >IRQ15 */
472 };
473
474 int __init acpi_irq_penalty_init(void)
475 {
476 struct acpi_pci_link *link;
477 int i;
478
479 /*
480 * Update penalties to facilitate IRQ balancing.
481 */
482 list_for_each_entry(link, &acpi_link_list, list) {
483
484 /*
485 * reflect the possible and active irqs in the penalty table --
486 * useful for breaking ties.
487 */
488 if (link->irq.possible_count) {
489 int penalty =
490 PIRQ_PENALTY_PCI_POSSIBLE /
491 link->irq.possible_count;
492
493 for (i = 0; i < link->irq.possible_count; i++) {
494 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
495 acpi_irq_penalty[link->irq.
496 possible[i]] +=
497 penalty;
498 }
499
500 } else if (link->irq.active) {
501 acpi_irq_penalty[link->irq.active] +=
502 PIRQ_PENALTY_PCI_POSSIBLE;
503 }
504 }
505 /* Add a penalty for the SCI */
506 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
507 return 0;
508 }
509
510 static int acpi_irq_balance = -1; /* 0: static, 1: balance */
511
512 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
513 {
514 int irq;
515 int i;
516
517 if (link->irq.initialized) {
518 if (link->refcnt == 0)
519 /* This means the link is disabled but initialized */
520 acpi_pci_link_set(link, link->irq.active);
521 return 0;
522 }
523
524 /*
525 * search for active IRQ in list of possible IRQs.
526 */
527 for (i = 0; i < link->irq.possible_count; ++i) {
528 if (link->irq.active == link->irq.possible[i])
529 break;
530 }
531 /*
532 * forget active IRQ that is not in possible list
533 */
534 if (i == link->irq.possible_count) {
535 if (acpi_strict)
536 printk(KERN_WARNING PREFIX "_CRS %d not found"
537 " in _PRS\n", link->irq.active);
538 link->irq.active = 0;
539 }
540
541 /*
542 * if active found, use it; else pick entry from end of possible list.
543 */
544 if (link->irq.active)
545 irq = link->irq.active;
546 else
547 irq = link->irq.possible[link->irq.possible_count - 1];
548
549 if (acpi_irq_balance || !link->irq.active) {
550 /*
551 * Select the best IRQ. This is done in reverse to promote
552 * the use of IRQs 9, 10, 11, and >15.
553 */
554 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
555 if (acpi_irq_penalty[irq] >
556 acpi_irq_penalty[link->irq.possible[i]])
557 irq = link->irq.possible[i];
558 }
559 }
560
561 /* Attempt to enable the link device at this IRQ. */
562 if (acpi_pci_link_set(link, irq)) {
563 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
564 "Try pci=noacpi or acpi=off\n",
565 acpi_device_name(link->device),
566 acpi_device_bid(link->device));
567 return -ENODEV;
568 } else {
569 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
570 printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
571 acpi_device_name(link->device),
572 acpi_device_bid(link->device), link->irq.active);
573 }
574
575 link->irq.initialized = 1;
576 return 0;
577 }
578
579 /*
580 * acpi_pci_link_allocate_irq
581 * success: return IRQ >= 0
582 * failure: return -1
583 */
584 int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
585 int *polarity, char **name)
586 {
587 int result;
588 struct acpi_device *device;
589 struct acpi_pci_link *link;
590
591 result = acpi_bus_get_device(handle, &device);
592 if (result) {
593 printk(KERN_ERR PREFIX "Invalid link device\n");
594 return -1;
595 }
596
597 link = acpi_driver_data(device);
598 if (!link) {
599 printk(KERN_ERR PREFIX "Invalid link context\n");
600 return -1;
601 }
602
603 /* TBD: Support multiple index (IRQ) entries per Link Device */
604 if (index) {
605 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
606 return -1;
607 }
608
609 mutex_lock(&acpi_link_lock);
610 if (acpi_pci_link_allocate(link)) {
611 mutex_unlock(&acpi_link_lock);
612 return -1;
613 }
614
615 if (!link->irq.active) {
616 mutex_unlock(&acpi_link_lock);
617 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
618 return -1;
619 }
620 link->refcnt++;
621 mutex_unlock(&acpi_link_lock);
622
623 if (triggering)
624 *triggering = link->irq.triggering;
625 if (polarity)
626 *polarity = link->irq.polarity;
627 if (name)
628 *name = acpi_device_bid(link->device);
629 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
630 "Link %s is referenced\n",
631 acpi_device_bid(link->device)));
632 return (link->irq.active);
633 }
634
635 /*
636 * We don't change link's irq information here. After it is reenabled, we
637 * continue use the info
638 */
639 int acpi_pci_link_free_irq(acpi_handle handle)
640 {
641 struct acpi_device *device;
642 struct acpi_pci_link *link;
643 acpi_status result;
644
645 result = acpi_bus_get_device(handle, &device);
646 if (result) {
647 printk(KERN_ERR PREFIX "Invalid link device\n");
648 return -1;
649 }
650
651 link = acpi_driver_data(device);
652 if (!link) {
653 printk(KERN_ERR PREFIX "Invalid link context\n");
654 return -1;
655 }
656
657 mutex_lock(&acpi_link_lock);
658 if (!link->irq.initialized) {
659 mutex_unlock(&acpi_link_lock);
660 printk(KERN_ERR PREFIX "Link isn't initialized\n");
661 return -1;
662 }
663 #ifdef FUTURE_USE
664 /*
665 * The Link reference count allows us to _DISable an unused link
666 * and suspend time, and set it again on resume.
667 * However, 2.6.12 still has irq_router.resume
668 * which blindly restores the link state.
669 * So we disable the reference count method
670 * to prevent duplicate acpi_pci_link_set()
671 * which would harm some systems
672 */
673 link->refcnt--;
674 #endif
675 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
676 "Link %s is dereferenced\n",
677 acpi_device_bid(link->device)));
678
679 if (link->refcnt == 0)
680 acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
681
682 mutex_unlock(&acpi_link_lock);
683 return (link->irq.active);
684 }
685
686 /* --------------------------------------------------------------------------
687 Driver Interface
688 -------------------------------------------------------------------------- */
689
690 static int acpi_pci_link_add(struct acpi_device *device,
691 const struct acpi_device_id *not_used)
692 {
693 int result;
694 struct acpi_pci_link *link;
695 int i;
696 int found = 0;
697
698 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
699 if (!link)
700 return -ENOMEM;
701
702 link->device = device;
703 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
704 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
705 device->driver_data = link;
706
707 mutex_lock(&acpi_link_lock);
708 result = acpi_pci_link_get_possible(link);
709 if (result)
710 goto end;
711
712 /* query and set link->irq.active */
713 acpi_pci_link_get_current(link);
714
715 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
716 acpi_device_bid(device));
717 for (i = 0; i < link->irq.possible_count; i++) {
718 if (link->irq.active == link->irq.possible[i]) {
719 printk(KERN_CONT " *%d", link->irq.possible[i]);
720 found = 1;
721 } else
722 printk(KERN_CONT " %d", link->irq.possible[i]);
723 }
724
725 printk(KERN_CONT ")");
726
727 if (!found)
728 printk(KERN_CONT " *%d", link->irq.active);
729
730 if (!link->device->status.enabled)
731 printk(KERN_CONT ", disabled.");
732
733 printk(KERN_CONT "\n");
734
735 list_add_tail(&link->list, &acpi_link_list);
736
737 end:
738 /* disable all links -- to be activated on use */
739 acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
740 mutex_unlock(&acpi_link_lock);
741
742 if (result)
743 kfree(link);
744
745 return result < 0 ? result : 1;
746 }
747
748 static int acpi_pci_link_resume(struct acpi_pci_link *link)
749 {
750 if (link->refcnt && link->irq.active && link->irq.initialized)
751 return (acpi_pci_link_set(link, link->irq.active));
752
753 return 0;
754 }
755
756 static void irqrouter_resume(void)
757 {
758 struct acpi_pci_link *link;
759
760 list_for_each_entry(link, &acpi_link_list, list) {
761 acpi_pci_link_resume(link);
762 }
763 }
764
765 static void acpi_pci_link_remove(struct acpi_device *device)
766 {
767 struct acpi_pci_link *link;
768
769 link = acpi_driver_data(device);
770
771 mutex_lock(&acpi_link_lock);
772 list_del(&link->list);
773 mutex_unlock(&acpi_link_lock);
774
775 kfree(link);
776 }
777
778 /*
779 * modify acpi_irq_penalty[] from cmdline
780 */
781 static int __init acpi_irq_penalty_update(char *str, int used)
782 {
783 int i;
784
785 for (i = 0; i < 16; i++) {
786 int retval;
787 int irq;
788
789 retval = get_option(&str, &irq);
790
791 if (!retval)
792 break; /* no number found */
793
794 if (irq < 0)
795 continue;
796
797 if (irq >= ARRAY_SIZE(acpi_irq_penalty))
798 continue;
799
800 if (used)
801 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
802 else
803 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
804
805 if (retval != 2) /* no next number */
806 break;
807 }
808 return 1;
809 }
810
811 /*
812 * We'd like PNP to call this routine for the
813 * single ISA_USED value for each legacy device.
814 * But instead it calls us with each POSSIBLE setting.
815 * There is no ISA_POSSIBLE weight, so we simply use
816 * the (small) PCI_USING penalty.
817 */
818 void acpi_penalize_isa_irq(int irq, int active)
819 {
820 if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
821 if (active)
822 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
823 else
824 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
825 }
826 }
827
828 /*
829 * Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict with
830 * PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be use for
831 * PCI IRQs.
832 */
833 void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
834 {
835 if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
836 if (trigger != ACPI_MADT_TRIGGER_LEVEL ||
837 polarity != ACPI_MADT_POLARITY_ACTIVE_LOW)
838 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_ALWAYS;
839 else
840 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
841 }
842 }
843
844 /*
845 * Over-ride default table to reserve additional IRQs for use by ISA
846 * e.g. acpi_irq_isa=5
847 * Useful for telling ACPI how not to interfere with your ISA sound card.
848 */
849 static int __init acpi_irq_isa(char *str)
850 {
851 return acpi_irq_penalty_update(str, 1);
852 }
853
854 __setup("acpi_irq_isa=", acpi_irq_isa);
855
856 /*
857 * Over-ride default table to free additional IRQs for use by PCI
858 * e.g. acpi_irq_pci=7,15
859 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
860 */
861 static int __init acpi_irq_pci(char *str)
862 {
863 return acpi_irq_penalty_update(str, 0);
864 }
865
866 __setup("acpi_irq_pci=", acpi_irq_pci);
867
868 static int __init acpi_irq_nobalance_set(char *str)
869 {
870 acpi_irq_balance = 0;
871 return 1;
872 }
873
874 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
875
876 static int __init acpi_irq_balance_set(char *str)
877 {
878 acpi_irq_balance = 1;
879 return 1;
880 }
881
882 __setup("acpi_irq_balance", acpi_irq_balance_set);
883
884 static struct syscore_ops irqrouter_syscore_ops = {
885 .resume = irqrouter_resume,
886 };
887
888 void __init acpi_pci_link_init(void)
889 {
890 if (acpi_noirq)
891 return;
892
893 if (acpi_irq_balance == -1) {
894 /* no command line switch: enable balancing in IOAPIC mode */
895 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
896 acpi_irq_balance = 1;
897 else
898 acpi_irq_balance = 0;
899 }
900 register_syscore_ops(&irqrouter_syscore_ops);
901 acpi_scan_add_handler(&pci_link_handler);
902 }
Linux with added FPC-III support