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[media] media: coda: Fix DT driver data pointer for i.MX27
[linux/fpc-iii.git] / drivers / acpi / pci_link.c
blob2652a614deebe8062c71bb4e3c7f26fe8d315a45
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
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
45
46 #define PREFIX "ACPI: "
47
48 #define _COMPONENT ACPI_PCI_COMPONENT
49 ACPI_MODULE_NAME("pci_link");
50 #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
51 #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
52 #define ACPI_PCI_LINK_FILE_INFO "info"
53 #define ACPI_PCI_LINK_FILE_STATUS "state"
54 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
55
56 static int acpi_pci_link_add(struct acpi_device *device,
57 const struct acpi_device_id *not_used);
58 static void acpi_pci_link_remove(struct acpi_device *device);
59
60 static const struct acpi_device_id link_device_ids[] = {
61 {"PNP0C0F", 0},
62 {"", 0},
63 };
64
65 static struct acpi_scan_handler pci_link_handler = {
66 .ids = link_device_ids,
67 .attach = acpi_pci_link_add,
68 .detach = acpi_pci_link_remove,
69 };
70
71 /*
72 * If a link is initialized, we never change its active and initialized
73 * later even the link is disable. Instead, we just repick the active irq
74 */
75 struct acpi_pci_link_irq {
76 u8 active; /* Current IRQ */
77 u8 triggering; /* All IRQs */
78 u8 polarity; /* All IRQs */
79 u8 resource_type;
80 u8 possible_count;
81 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
82 u8 initialized:1;
83 u8 reserved:7;
84 };
85
86 struct acpi_pci_link {
87 struct list_head list;
88 struct acpi_device *device;
89 struct acpi_pci_link_irq irq;
90 int refcnt;
91 };
92
93 static LIST_HEAD(acpi_link_list);
94 static DEFINE_MUTEX(acpi_link_lock);
95
96 /* --------------------------------------------------------------------------
97 PCI Link Device Management
98 -------------------------------------------------------------------------- */
99
100 /*
101 * set context (link) possible list from resource list
102 */
103 static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
104 void *context)
105 {
106 struct acpi_pci_link *link = context;
107 u32 i;
108
109 switch (resource->type) {
110 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
111 case ACPI_RESOURCE_TYPE_END_TAG:
112 return AE_OK;
113 case ACPI_RESOURCE_TYPE_IRQ:
114 {
115 struct acpi_resource_irq *p = &resource->data.irq;
116 if (!p || !p->interrupt_count) {
117 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
118 "Blank _PRS IRQ resource\n"));
119 return AE_OK;
120 }
121 for (i = 0;
122 (i < p->interrupt_count
123 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
124 if (!p->interrupts[i]) {
125 printk(KERN_WARNING PREFIX
126 "Invalid _PRS IRQ %d\n",
127 p->interrupts[i]);
128 continue;
129 }
130 link->irq.possible[i] = p->interrupts[i];
131 link->irq.possible_count++;
132 }
133 link->irq.triggering = p->triggering;
134 link->irq.polarity = p->polarity;
135 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
136 break;
137 }
138 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
139 {
140 struct acpi_resource_extended_irq *p =
141 &resource->data.extended_irq;
142 if (!p || !p->interrupt_count) {
143 printk(KERN_WARNING PREFIX
144 "Blank _PRS EXT IRQ resource\n");
145 return AE_OK;
146 }
147 for (i = 0;
148 (i < p->interrupt_count
149 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
150 if (!p->interrupts[i]) {
151 printk(KERN_WARNING PREFIX
152 "Invalid _PRS IRQ %d\n",
153 p->interrupts[i]);
154 continue;
155 }
156 link->irq.possible[i] = p->interrupts[i];
157 link->irq.possible_count++;
158 }
159 link->irq.triggering = p->triggering;
160 link->irq.polarity = p->polarity;
161 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
162 break;
163 }
164 default:
165 printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
166 resource->type);
167 return AE_OK;
168 }
169
170 return AE_CTRL_TERMINATE;
171 }
172
173 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
174 {
175 acpi_status status;
176
177 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
178 acpi_pci_link_check_possible, link);
179 if (ACPI_FAILURE(status)) {
180 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
181 return -ENODEV;
182 }
183
184 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
185 "Found %d possible IRQs\n",
186 link->irq.possible_count));
187
188 return 0;
189 }
190
191 static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
192 void *context)
193 {
194 int *irq = context;
195
196 switch (resource->type) {
197 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
198 case ACPI_RESOURCE_TYPE_END_TAG:
199 return AE_OK;
200 case ACPI_RESOURCE_TYPE_IRQ:
201 {
202 struct acpi_resource_irq *p = &resource->data.irq;
203 if (!p || !p->interrupt_count) {
204 /*
205 * IRQ descriptors may have no IRQ# bits set,
206 * particularly those those w/ _STA disabled
207 */
208 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
209 "Blank _CRS IRQ resource\n"));
210 return AE_OK;
211 }
212 *irq = p->interrupts[0];
213 break;
214 }
215 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
216 {
217 struct acpi_resource_extended_irq *p =
218 &resource->data.extended_irq;
219 if (!p || !p->interrupt_count) {
220 /*
221 * extended IRQ descriptors must
222 * return at least 1 IRQ
223 */
224 printk(KERN_WARNING PREFIX
225 "Blank _CRS EXT IRQ resource\n");
226 return AE_OK;
227 }
228 *irq = p->interrupts[0];
229 break;
230 }
231 break;
232 default:
233 printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
234 resource->type);
235 return AE_OK;
236 }
237
238 return AE_CTRL_TERMINATE;
239 }
240
241 /*
242 * Run _CRS and set link->irq.active
243 *
244 * return value:
245 * 0 - success
246 * !0 - failure
247 */
248 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
249 {
250 int result = 0;
251 acpi_status status;
252 int irq = 0;
253
254 link->irq.active = 0;
255
256 /* in practice, status disabled is meaningless, ignore it */
257 if (acpi_strict) {
258 /* Query _STA, set link->device->status */
259 result = acpi_bus_get_status(link->device);
260 if (result) {
261 printk(KERN_ERR PREFIX "Unable to read status\n");
262 goto end;
263 }
264
265 if (!link->device->status.enabled) {
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
267 return 0;
268 }
269 }
270
271 /*
272 * Query and parse _CRS to get the current IRQ assignment.
273 */
274
275 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
276 acpi_pci_link_check_current, &irq);
277 if (ACPI_FAILURE(status)) {
278 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
279 result = -ENODEV;
280 goto end;
281 }
282
283 if (acpi_strict && !irq) {
284 printk(KERN_ERR PREFIX "_CRS returned 0\n");
285 result = -ENODEV;
286 }
287
288 link->irq.active = irq;
289
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
291
292 end:
293 return result;
294 }
295
296 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
297 {
298 int result;
299 acpi_status status;
300 struct {
301 struct acpi_resource res;
302 struct acpi_resource end;
303 } *resource;
304 struct acpi_buffer buffer = { 0, NULL };
305
306 if (!irq)
307 return -EINVAL;
308
309 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
310 if (!resource)
311 return -ENOMEM;
312
313 buffer.length = sizeof(*resource) + 1;
314 buffer.pointer = resource;
315
316 switch (link->irq.resource_type) {
317 case ACPI_RESOURCE_TYPE_IRQ:
318 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
319 resource->res.length = sizeof(struct acpi_resource);
320 resource->res.data.irq.triggering = link->irq.triggering;
321 resource->res.data.irq.polarity =
322 link->irq.polarity;
323 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
324 resource->res.data.irq.sharable =
325 ACPI_EXCLUSIVE;
326 else
327 resource->res.data.irq.sharable = ACPI_SHARED;
328 resource->res.data.irq.interrupt_count = 1;
329 resource->res.data.irq.interrupts[0] = irq;
330 break;
331
332 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
333 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
334 resource->res.length = sizeof(struct acpi_resource);
335 resource->res.data.extended_irq.producer_consumer =
336 ACPI_CONSUMER;
337 resource->res.data.extended_irq.triggering =
338 link->irq.triggering;
339 resource->res.data.extended_irq.polarity =
340 link->irq.polarity;
341 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
342 resource->res.data.irq.sharable =
343 ACPI_EXCLUSIVE;
344 else
345 resource->res.data.irq.sharable = ACPI_SHARED;
346 resource->res.data.extended_irq.interrupt_count = 1;
347 resource->res.data.extended_irq.interrupts[0] = irq;
348 /* ignore resource_source, it's optional */
349 break;
350 default:
351 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
352 result = -EINVAL;
353 goto end;
354
355 }
356 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
357 resource->end.length = sizeof(struct acpi_resource);
358
359 /* Attempt to set the resource */
360 status = acpi_set_current_resources(link->device->handle, &buffer);
361
362 /* check for total failure */
363 if (ACPI_FAILURE(status)) {
364 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
365 result = -ENODEV;
366 goto end;
367 }
368
369 /* Query _STA, set device->status */
370 result = acpi_bus_get_status(link->device);
371 if (result) {
372 printk(KERN_ERR PREFIX "Unable to read status\n");
373 goto end;
374 }
375 if (!link->device->status.enabled) {
376 printk(KERN_WARNING PREFIX
377 "%s [%s] disabled and referenced, BIOS bug\n",
378 acpi_device_name(link->device),
379 acpi_device_bid(link->device));
380 }
381
382 /* Query _CRS, set link->irq.active */
383 result = acpi_pci_link_get_current(link);
384 if (result) {
385 goto end;
386 }
387
388 /*
389 * Is current setting not what we set?
390 * set link->irq.active
391 */
392 if (link->irq.active != irq) {
393 /*
394 * policy: when _CRS doesn't return what we just _SRS
395 * assume _SRS worked and override _CRS value.
396 */
397 printk(KERN_WARNING PREFIX
398 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
399 acpi_device_name(link->device),
400 acpi_device_bid(link->device), link->irq.active, irq);
401 link->irq.active = irq;
402 }
403
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
405
406 end:
407 kfree(resource);
408 return result;
409 }
410
411 /* --------------------------------------------------------------------------
412 PCI Link IRQ Management
413 -------------------------------------------------------------------------- */
414
415 /*
416 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
417 * Link Devices to move the PIRQs around to minimize sharing.
418 *
419 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
420 * that the BIOS has already set to active. This is necessary because
421 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
422 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
423 * even if acpi_irq_nobalance is set.
424 *
425 * A tables of penalties avoids directing PCI interrupts to well known
426 * ISA IRQs. Boot params are available to over-ride the default table:
427 *
428 * List interrupts that are free for PCI use.
429 * acpi_irq_pci=n[,m]
430 *
431 * List interrupts that should not be used for PCI:
432 * acpi_irq_isa=n[,m]
433 *
434 * Note that PCI IRQ routers have a list of possible IRQs,
435 * which may not include the IRQs this table says are available.
436 *
437 * Since this heuristic can't tell the difference between a link
438 * that no device will attach to, vs. a link which may be shared
439 * by multiple active devices -- it is not optimal.
440 *
441 * If interrupt performance is that important, get an IO-APIC system
442 * with a pin dedicated to each device. Or for that matter, an MSI
443 * enabled system.
444 */
445
446 #define ACPI_MAX_IRQS 256
447 #define ACPI_MAX_ISA_IRQ 16
448
449 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
450 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
451 #define PIRQ_PENALTY_PCI_USING (16*16*16)
452 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
453 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
454 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
455
456 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
457 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
458 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
459 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
460 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
461 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
462 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
463 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
465 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
466 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
467 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
468 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
469 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
470 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
471 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
472 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
473 /* >IRQ15 */
474 };
475
476 int __init acpi_irq_penalty_init(void)
477 {
478 struct acpi_pci_link *link;
479 int i;
480
481 /*
482 * Update penalties to facilitate IRQ balancing.
483 */
484 list_for_each_entry(link, &acpi_link_list, list) {
485
486 /*
487 * reflect the possible and active irqs in the penalty table --
488 * useful for breaking ties.
489 */
490 if (link->irq.possible_count) {
491 int penalty =
492 PIRQ_PENALTY_PCI_POSSIBLE /
493 link->irq.possible_count;
494
495 for (i = 0; i < link->irq.possible_count; i++) {
496 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
497 acpi_irq_penalty[link->irq.
498 possible[i]] +=
499 penalty;
500 }
501
502 } else if (link->irq.active) {
503 acpi_irq_penalty[link->irq.active] +=
504 PIRQ_PENALTY_PCI_POSSIBLE;
505 }
506 }
507 /* Add a penalty for the SCI */
508 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
509 return 0;
510 }
511
512 static int acpi_irq_balance = -1; /* 0: static, 1: balance */
513
514 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
515 {
516 int irq;
517 int i;
518
519 if (link->irq.initialized) {
520 if (link->refcnt == 0)
521 /* This means the link is disabled but initialized */
522 acpi_pci_link_set(link, link->irq.active);
523 return 0;
524 }
525
526 /*
527 * search for active IRQ in list of possible IRQs.
528 */
529 for (i = 0; i < link->irq.possible_count; ++i) {
530 if (link->irq.active == link->irq.possible[i])
531 break;
532 }
533 /*
534 * forget active IRQ that is not in possible list
535 */
536 if (i == link->irq.possible_count) {
537 if (acpi_strict)
538 printk(KERN_WARNING PREFIX "_CRS %d not found"
539 " in _PRS\n", link->irq.active);
540 link->irq.active = 0;
541 }
542
543 /*
544 * if active found, use it; else pick entry from end of possible list.
545 */
546 if (link->irq.active)
547 irq = link->irq.active;
548 else
549 irq = link->irq.possible[link->irq.possible_count - 1];
550
551 if (acpi_irq_balance || !link->irq.active) {
552 /*
553 * Select the best IRQ. This is done in reverse to promote
554 * the use of IRQs 9, 10, 11, and >15.
555 */
556 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
557 if (acpi_irq_penalty[irq] >
558 acpi_irq_penalty[link->irq.possible[i]])
559 irq = link->irq.possible[i];
560 }
561 }
562
563 /* Attempt to enable the link device at this IRQ. */
564 if (acpi_pci_link_set(link, irq)) {
565 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
566 "Try pci=noacpi or acpi=off\n",
567 acpi_device_name(link->device),
568 acpi_device_bid(link->device));
569 return -ENODEV;
570 } else {
571 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
572 printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
573 acpi_device_name(link->device),
574 acpi_device_bid(link->device), link->irq.active);
575 }
576
577 link->irq.initialized = 1;
578 return 0;
579 }
580
581 /*
582 * acpi_pci_link_allocate_irq
583 * success: return IRQ >= 0
584 * failure: return -1
585 */
586 int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
587 int *polarity, char **name)
588 {
589 int result;
590 struct acpi_device *device;
591 struct acpi_pci_link *link;
592
593 result = acpi_bus_get_device(handle, &device);
594 if (result) {
595 printk(KERN_ERR PREFIX "Invalid link device\n");
596 return -1;
597 }
598
599 link = acpi_driver_data(device);
600 if (!link) {
601 printk(KERN_ERR PREFIX "Invalid link context\n");
602 return -1;
603 }
604
605 /* TBD: Support multiple index (IRQ) entries per Link Device */
606 if (index) {
607 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
608 return -1;
609 }
610
611 mutex_lock(&acpi_link_lock);
612 if (acpi_pci_link_allocate(link)) {
613 mutex_unlock(&acpi_link_lock);
614 return -1;
615 }
616
617 if (!link->irq.active) {
618 mutex_unlock(&acpi_link_lock);
619 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
620 return -1;
621 }
622 link->refcnt++;
623 mutex_unlock(&acpi_link_lock);
624
625 if (triggering)
626 *triggering = link->irq.triggering;
627 if (polarity)
628 *polarity = link->irq.polarity;
629 if (name)
630 *name = acpi_device_bid(link->device);
631 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
632 "Link %s is referenced\n",
633 acpi_device_bid(link->device)));
634 return (link->irq.active);
635 }
636
637 /*
638 * We don't change link's irq information here. After it is reenabled, we
639 * continue use the info
640 */
641 int acpi_pci_link_free_irq(acpi_handle handle)
642 {
643 struct acpi_device *device;
644 struct acpi_pci_link *link;
645 acpi_status result;
646
647 result = acpi_bus_get_device(handle, &device);
648 if (result) {
649 printk(KERN_ERR PREFIX "Invalid link device\n");
650 return -1;
651 }
652
653 link = acpi_driver_data(device);
654 if (!link) {
655 printk(KERN_ERR PREFIX "Invalid link context\n");
656 return -1;
657 }
658
659 mutex_lock(&acpi_link_lock);
660 if (!link->irq.initialized) {
661 mutex_unlock(&acpi_link_lock);
662 printk(KERN_ERR PREFIX "Link isn't initialized\n");
663 return -1;
664 }
665 #ifdef FUTURE_USE
666 /*
667 * The Link reference count allows us to _DISable an unused link
668 * and suspend time, and set it again on resume.
669 * However, 2.6.12 still has irq_router.resume
670 * which blindly restores the link state.
671 * So we disable the reference count method
672 * to prevent duplicate acpi_pci_link_set()
673 * which would harm some systems
674 */
675 link->refcnt--;
676 #endif
677 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
678 "Link %s is dereferenced\n",
679 acpi_device_bid(link->device)));
680
681 if (link->refcnt == 0)
682 acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
683
684 mutex_unlock(&acpi_link_lock);
685 return (link->irq.active);
686 }
687
688 /* --------------------------------------------------------------------------
689 Driver Interface
690 -------------------------------------------------------------------------- */
691
692 static int acpi_pci_link_add(struct acpi_device *device,
693 const struct acpi_device_id *not_used)
694 {
695 int result;
696 struct acpi_pci_link *link;
697 int i;
698 int found = 0;
699
700 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
701 if (!link)
702 return -ENOMEM;
703
704 link->device = device;
705 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
706 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
707 device->driver_data = link;
708
709 mutex_lock(&acpi_link_lock);
710 result = acpi_pci_link_get_possible(link);
711 if (result)
712 goto end;
713
714 /* query and set link->irq.active */
715 acpi_pci_link_get_current(link);
716
717 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
718 acpi_device_bid(device));
719 for (i = 0; i < link->irq.possible_count; i++) {
720 if (link->irq.active == link->irq.possible[i]) {
721 printk(KERN_CONT " *%d", link->irq.possible[i]);
722 found = 1;
723 } else
724 printk(KERN_CONT " %d", link->irq.possible[i]);
725 }
726
727 printk(KERN_CONT ")");
728
729 if (!found)
730 printk(KERN_CONT " *%d", link->irq.active);
731
732 if (!link->device->status.enabled)
733 printk(KERN_CONT ", disabled.");
734
735 printk(KERN_CONT "\n");
736
737 list_add_tail(&link->list, &acpi_link_list);
738
739 end:
740 /* disable all links -- to be activated on use */
741 acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
742 mutex_unlock(&acpi_link_lock);
743
744 if (result)
745 kfree(link);
746
747 return result < 0 ? result : 1;
748 }
749
750 static int acpi_pci_link_resume(struct acpi_pci_link *link)
751 {
752 if (link->refcnt && link->irq.active && link->irq.initialized)
753 return (acpi_pci_link_set(link, link->irq.active));
754
755 return 0;
756 }
757
758 static void irqrouter_resume(void)
759 {
760 struct acpi_pci_link *link;
761
762 list_for_each_entry(link, &acpi_link_list, list) {
763 acpi_pci_link_resume(link);
764 }
765 }
766
767 static void acpi_pci_link_remove(struct acpi_device *device)
768 {
769 struct acpi_pci_link *link;
770
771 link = acpi_driver_data(device);
772
773 mutex_lock(&acpi_link_lock);
774 list_del(&link->list);
775 mutex_unlock(&acpi_link_lock);
776
777 kfree(link);
778 }
779
780 /*
781 * modify acpi_irq_penalty[] from cmdline
782 */
783 static int __init acpi_irq_penalty_update(char *str, int used)
784 {
785 int i;
786
787 for (i = 0; i < 16; i++) {
788 int retval;
789 int irq;
790
791 retval = get_option(&str, &irq);
792
793 if (!retval)
794 break; /* no number found */
795
796 if (irq < 0)
797 continue;
798
799 if (irq >= ARRAY_SIZE(acpi_irq_penalty))
800 continue;
801
802 if (used)
803 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
804 else
805 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
806
807 if (retval != 2) /* no next number */
808 break;
809 }
810 return 1;
811 }
812
813 /*
814 * We'd like PNP to call this routine for the
815 * single ISA_USED value for each legacy device.
816 * But instead it calls us with each POSSIBLE setting.
817 * There is no ISA_POSSIBLE weight, so we simply use
818 * the (small) PCI_USING penalty.
819 */
820 void acpi_penalize_isa_irq(int irq, int active)
821 {
822 if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
823 if (active)
824 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
825 else
826 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
827 }
828 }
829
830 /*
831 * Over-ride default table to reserve additional IRQs for use by ISA
832 * e.g. acpi_irq_isa=5
833 * Useful for telling ACPI how not to interfere with your ISA sound card.
834 */
835 static int __init acpi_irq_isa(char *str)
836 {
837 return acpi_irq_penalty_update(str, 1);
838 }
839
840 __setup("acpi_irq_isa=", acpi_irq_isa);
841
842 /*
843 * Over-ride default table to free additional IRQs for use by PCI
844 * e.g. acpi_irq_pci=7,15
845 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
846 */
847 static int __init acpi_irq_pci(char *str)
848 {
849 return acpi_irq_penalty_update(str, 0);
850 }
851
852 __setup("acpi_irq_pci=", acpi_irq_pci);
853
854 static int __init acpi_irq_nobalance_set(char *str)
855 {
856 acpi_irq_balance = 0;
857 return 1;
858 }
859
860 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
861
862 static int __init acpi_irq_balance_set(char *str)
863 {
864 acpi_irq_balance = 1;
865 return 1;
866 }
867
868 __setup("acpi_irq_balance", acpi_irq_balance_set);
869
870 static struct syscore_ops irqrouter_syscore_ops = {
871 .resume = irqrouter_resume,
872 };
873
874 void __init acpi_pci_link_init(void)
875 {
876 if (acpi_noirq)
877 return;
878
879 if (acpi_irq_balance == -1) {
880 /* no command line switch: enable balancing in IOAPIC mode */
881 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
882 acpi_irq_balance = 1;
883 else
884 acpi_irq_balance = 0;
885 }
886 register_syscore_ops(&irqrouter_syscore_ops);
887 acpi_scan_add_handler(&pci_link_handler);
888 }
Linux with added FPC-III support