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i2c/pcf8574: No arbitrary initialization
[linux-2.6/sactl.git] / drivers / acpi / pci_link.c
blobc9f526e55392b1260fb6896772b0ba77ef2ace8a
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/sysdev.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/types.h>
37 #include <linux/proc_fs.h>
38 #include <linux/spinlock.h>
39 #include <linux/pm.h>
40 #include <linux/pci.h>
41 #include <linux/mutex.h>
42
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.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 static int acpi_pci_link_add(struct acpi_device *device);
54 static int acpi_pci_link_remove(struct acpi_device *device, int type);
55
56 static struct acpi_device_id link_device_ids[] = {
57 {"PNP0C0F", 0},
58 {"", 0},
59 };
60 MODULE_DEVICE_TABLE(acpi, link_device_ids);
61
62 static struct acpi_driver acpi_pci_link_driver = {
63 .name = "pci_link",
64 .class = ACPI_PCI_LINK_CLASS,
65 .ids = link_device_ids,
66 .ops = {
67 .add = acpi_pci_link_add,
68 .remove = acpi_pci_link_remove,
69 },
70 };
71
72 /*
73 * If a link is initialized, we never change its active and initialized
74 * later even the link is disable. Instead, we just repick the active irq
75 */
76 struct acpi_pci_link_irq {
77 u8 active; /* Current IRQ */
78 u8 triggering; /* All IRQs */
79 u8 polarity; /* All IRQs */
80 u8 resource_type;
81 u8 possible_count;
82 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
83 u8 initialized:1;
84 u8 reserved:7;
85 };
86
87 struct acpi_pci_link {
88 struct list_head node;
89 struct acpi_device *device;
90 struct acpi_pci_link_irq irq;
91 int refcnt;
92 };
93
94 static struct {
95 int count;
96 struct list_head entries;
97 } acpi_link;
98 DEFINE_MUTEX(acpi_link_lock);
99
100 /* --------------------------------------------------------------------------
101 PCI Link Device Management
102 -------------------------------------------------------------------------- */
103
104 /*
105 * set context (link) possible list from resource list
106 */
107 static acpi_status
108 acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
109 {
110 struct acpi_pci_link *link = context;
111 u32 i = 0;
112
113
114 switch (resource->type) {
115 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
116 return AE_OK;
117 case ACPI_RESOURCE_TYPE_IRQ:
118 {
119 struct acpi_resource_irq *p = &resource->data.irq;
120 if (!p || !p->interrupt_count) {
121 printk(KERN_WARNING PREFIX "Blank IRQ resource\n");
122 return AE_OK;
123 }
124 for (i = 0;
125 (i < p->interrupt_count
126 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
127 if (!p->interrupts[i]) {
128 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
129 p->interrupts[i]);
130 continue;
131 }
132 link->irq.possible[i] = p->interrupts[i];
133 link->irq.possible_count++;
134 }
135 link->irq.triggering = p->triggering;
136 link->irq.polarity = p->polarity;
137 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
138 break;
139 }
140 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
141 {
142 struct acpi_resource_extended_irq *p =
143 &resource->data.extended_irq;
144 if (!p || !p->interrupt_count) {
145 printk(KERN_WARNING PREFIX
146 "Blank EXT IRQ resource\n");
147 return AE_OK;
148 }
149 for (i = 0;
150 (i < p->interrupt_count
151 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
152 if (!p->interrupts[i]) {
153 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
154 p->interrupts[i]);
155 continue;
156 }
157 link->irq.possible[i] = p->interrupts[i];
158 link->irq.possible_count++;
159 }
160 link->irq.triggering = p->triggering;
161 link->irq.polarity = p->polarity;
162 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
163 break;
164 }
165 default:
166 printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n");
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
178 if (!link)
179 return -EINVAL;
180
181 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
182 acpi_pci_link_check_possible, link);
183 if (ACPI_FAILURE(status)) {
184 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
185 return -ENODEV;
186 }
187
188 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
189 "Found %d possible IRQs\n",
190 link->irq.possible_count));
191
192 return 0;
193 }
194
195 static acpi_status
196 acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
197 {
198 int *irq = (int *)context;
199
200
201 switch (resource->type) {
202 case ACPI_RESOURCE_TYPE_IRQ:
203 {
204 struct acpi_resource_irq *p = &resource->data.irq;
205 if (!p || !p->interrupt_count) {
206 /*
207 * IRQ descriptors may have no IRQ# bits set,
208 * particularly those those w/ _STA disabled
209 */
210 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
211 "Blank IRQ resource\n"));
212 return AE_OK;
213 }
214 *irq = p->interrupts[0];
215 break;
216 }
217 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
218 {
219 struct acpi_resource_extended_irq *p =
220 &resource->data.extended_irq;
221 if (!p || !p->interrupt_count) {
222 /*
223 * extended IRQ descriptors must
224 * return at least 1 IRQ
225 */
226 printk(KERN_WARNING PREFIX
227 "Blank EXT IRQ resource\n");
228 return AE_OK;
229 }
230 *irq = p->interrupts[0];
231 break;
232 }
233 break;
234 default:
235 printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type);
236 case ACPI_RESOURCE_TYPE_END_TAG:
237 return AE_OK;
238 }
239 return AE_CTRL_TERMINATE;
240 }
241
242 /*
243 * Run _CRS and set link->irq.active
244 *
245 * return value:
246 * 0 - success
247 * !0 - failure
248 */
249 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
250 {
251 int result = 0;
252 acpi_status status = AE_OK;
253 int irq = 0;
254
255 if (!link)
256 return -EINVAL;
257
258 link->irq.active = 0;
259
260 /* in practice, status disabled is meaningless, ignore it */
261 if (acpi_strict) {
262 /* Query _STA, set link->device->status */
263 result = acpi_bus_get_status(link->device);
264 if (result) {
265 printk(KERN_ERR PREFIX "Unable to read status\n");
266 goto end;
267 }
268
269 if (!link->device->status.enabled) {
270 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
271 return 0;
272 }
273 }
274
275 /*
276 * Query and parse _CRS to get the current IRQ assignment.
277 */
278
279 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
280 acpi_pci_link_check_current, &irq);
281 if (ACPI_FAILURE(status)) {
282 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
283 result = -ENODEV;
284 goto end;
285 }
286
287 if (acpi_strict && !irq) {
288 printk(KERN_ERR PREFIX "_CRS returned 0\n");
289 result = -ENODEV;
290 }
291
292 link->irq.active = irq;
293
294 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
295
296 end:
297 return result;
298 }
299
300 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
301 {
302 int result = 0;
303 acpi_status status = AE_OK;
304 struct {
305 struct acpi_resource res;
306 struct acpi_resource end;
307 } *resource;
308 struct acpi_buffer buffer = { 0, NULL };
309
310
311 if (!link || !irq)
312 return -EINVAL;
313
314 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
315 if (!resource)
316 return -ENOMEM;
317
318 buffer.length = sizeof(*resource) + 1;
319 buffer.pointer = resource;
320
321 switch (link->irq.resource_type) {
322 case ACPI_RESOURCE_TYPE_IRQ:
323 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
324 resource->res.length = sizeof(struct acpi_resource);
325 resource->res.data.irq.triggering = link->irq.triggering;
326 resource->res.data.irq.polarity =
327 link->irq.polarity;
328 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
329 resource->res.data.irq.sharable =
330 ACPI_EXCLUSIVE;
331 else
332 resource->res.data.irq.sharable = ACPI_SHARED;
333 resource->res.data.irq.interrupt_count = 1;
334 resource->res.data.irq.interrupts[0] = irq;
335 break;
336
337 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
338 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
339 resource->res.length = sizeof(struct acpi_resource);
340 resource->res.data.extended_irq.producer_consumer =
341 ACPI_CONSUMER;
342 resource->res.data.extended_irq.triggering =
343 link->irq.triggering;
344 resource->res.data.extended_irq.polarity =
345 link->irq.polarity;
346 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
347 resource->res.data.irq.sharable =
348 ACPI_EXCLUSIVE;
349 else
350 resource->res.data.irq.sharable = ACPI_SHARED;
351 resource->res.data.extended_irq.interrupt_count = 1;
352 resource->res.data.extended_irq.interrupts[0] = irq;
353 /* ignore resource_source, it's optional */
354 break;
355 default:
356 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
357 result = -EINVAL;
358 goto end;
359
360 }
361 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
362
363 /* Attempt to set the resource */
364 status = acpi_set_current_resources(link->device->handle, &buffer);
365
366 /* check for total failure */
367 if (ACPI_FAILURE(status)) {
368 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
369 result = -ENODEV;
370 goto end;
371 }
372
373 /* Query _STA, set device->status */
374 result = acpi_bus_get_status(link->device);
375 if (result) {
376 printk(KERN_ERR PREFIX "Unable to read status\n");
377 goto end;
378 }
379 if (!link->device->status.enabled) {
380 printk(KERN_WARNING PREFIX
381 "%s [%s] disabled and referenced, BIOS bug\n",
382 acpi_device_name(link->device),
383 acpi_device_bid(link->device));
384 }
385
386 /* Query _CRS, set link->irq.active */
387 result = acpi_pci_link_get_current(link);
388 if (result) {
389 goto end;
390 }
391
392 /*
393 * Is current setting not what we set?
394 * set link->irq.active
395 */
396 if (link->irq.active != irq) {
397 /*
398 * policy: when _CRS doesn't return what we just _SRS
399 * assume _SRS worked and override _CRS value.
400 */
401 printk(KERN_WARNING PREFIX
402 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
403 acpi_device_name(link->device),
404 acpi_device_bid(link->device), link->irq.active, irq);
405 link->irq.active = irq;
406 }
407
408 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
409
410 end:
411 kfree(resource);
412 return result;
413 }
414
415 /* --------------------------------------------------------------------------
416 PCI Link IRQ Management
417 -------------------------------------------------------------------------- */
418
419 /*
420 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
421 * Link Devices to move the PIRQs around to minimize sharing.
422 *
423 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
424 * that the BIOS has already set to active. This is necessary because
425 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
426 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
427 * even if acpi_irq_nobalance is set.
428 *
429 * A tables of penalties avoids directing PCI interrupts to well known
430 * ISA IRQs. Boot params are available to over-ride the default table:
431 *
432 * List interrupts that are free for PCI use.
433 * acpi_irq_pci=n[,m]
434 *
435 * List interrupts that should not be used for PCI:
436 * acpi_irq_isa=n[,m]
437 *
438 * Note that PCI IRQ routers have a list of possible IRQs,
439 * which may not include the IRQs this table says are available.
440 *
441 * Since this heuristic can't tell the difference between a link
442 * that no device will attach to, vs. a link which may be shared
443 * by multiple active devices -- it is not optimal.
444 *
445 * If interrupt performance is that important, get an IO-APIC system
446 * with a pin dedicated to each device. Or for that matter, an MSI
447 * enabled system.
448 */
449
450 #define ACPI_MAX_IRQS 256
451 #define ACPI_MAX_ISA_IRQ 16
452
453 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
454 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
455 #define PIRQ_PENALTY_PCI_USING (16*16*16)
456 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
457 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
458 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
459
460 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
461 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
462 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
463 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
465 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
466 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
467 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
468 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
469 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
470 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
471 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
472 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
473 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
474 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
475 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
476 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
477 /* >IRQ15 */
478 };
479
480 int __init acpi_irq_penalty_init(void)
481 {
482 struct list_head *node = NULL;
483 struct acpi_pci_link *link = NULL;
484 int i = 0;
485
486
487 /*
488 * Update penalties to facilitate IRQ balancing.
489 */
490 list_for_each(node, &acpi_link.entries) {
491
492 link = list_entry(node, struct acpi_pci_link, node);
493 if (!link) {
494 printk(KERN_ERR PREFIX "Invalid link context\n");
495 continue;
496 }
497
498 /*
499 * reflect the possible and active irqs in the penalty table --
500 * useful for breaking ties.
501 */
502 if (link->irq.possible_count) {
503 int penalty =
504 PIRQ_PENALTY_PCI_POSSIBLE /
505 link->irq.possible_count;
506
507 for (i = 0; i < link->irq.possible_count; i++) {
508 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
509 acpi_irq_penalty[link->irq.
510 possible[i]] +=
511 penalty;
512 }
513
514 } else if (link->irq.active) {
515 acpi_irq_penalty[link->irq.active] +=
516 PIRQ_PENALTY_PCI_POSSIBLE;
517 }
518 }
519 /* Add a penalty for the SCI */
520 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
521
522 return 0;
523 }
524
525 static int acpi_irq_balance; /* 0: static, 1: balance */
526
527 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
528 {
529 int irq;
530 int i;
531
532
533 if (link->irq.initialized) {
534 if (link->refcnt == 0)
535 /* This means the link is disabled but initialized */
536 acpi_pci_link_set(link, link->irq.active);
537 return 0;
538 }
539
540 /*
541 * search for active IRQ in list of possible IRQs.
542 */
543 for (i = 0; i < link->irq.possible_count; ++i) {
544 if (link->irq.active == link->irq.possible[i])
545 break;
546 }
547 /*
548 * forget active IRQ that is not in possible list
549 */
550 if (i == link->irq.possible_count) {
551 if (acpi_strict)
552 printk(KERN_WARNING PREFIX "_CRS %d not found"
553 " in _PRS\n", link->irq.active);
554 link->irq.active = 0;
555 }
556
557 /*
558 * if active found, use it; else pick entry from end of possible list.
559 */
560 if (link->irq.active) {
561 irq = link->irq.active;
562 } else {
563 irq = link->irq.possible[link->irq.possible_count - 1];
564 }
565
566 if (acpi_irq_balance || !link->irq.active) {
567 /*
568 * Select the best IRQ. This is done in reverse to promote
569 * the use of IRQs 9, 10, 11, and >15.
570 */
571 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
572 if (acpi_irq_penalty[irq] >
573 acpi_irq_penalty[link->irq.possible[i]])
574 irq = link->irq.possible[i];
575 }
576 }
577
578 /* Attempt to enable the link device at this IRQ. */
579 if (acpi_pci_link_set(link, irq)) {
580 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
581 "Try pci=noacpi or acpi=off\n",
582 acpi_device_name(link->device),
583 acpi_device_bid(link->device));
584 return -ENODEV;
585 } else {
586 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
587 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
588 acpi_device_name(link->device),
589 acpi_device_bid(link->device), link->irq.active);
590 }
591
592 link->irq.initialized = 1;
593
594 return 0;
595 }
596
597 /*
598 * acpi_pci_link_allocate_irq
599 * success: return IRQ >= 0
600 * failure: return -1
601 */
602
603 int
604 acpi_pci_link_allocate_irq(acpi_handle handle,
605 int index,
606 int *triggering, int *polarity, char **name)
607 {
608 int result = 0;
609 struct acpi_device *device = NULL;
610 struct acpi_pci_link *link = NULL;
611
612
613 result = acpi_bus_get_device(handle, &device);
614 if (result) {
615 printk(KERN_ERR PREFIX "Invalid link device\n");
616 return -1;
617 }
618
619 link = acpi_driver_data(device);
620 if (!link) {
621 printk(KERN_ERR PREFIX "Invalid link context\n");
622 return -1;
623 }
624
625 /* TBD: Support multiple index (IRQ) entries per Link Device */
626 if (index) {
627 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
628 return -1;
629 }
630
631 mutex_lock(&acpi_link_lock);
632 if (acpi_pci_link_allocate(link)) {
633 mutex_unlock(&acpi_link_lock);
634 return -1;
635 }
636
637 if (!link->irq.active) {
638 mutex_unlock(&acpi_link_lock);
639 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
640 return -1;
641 }
642 link->refcnt++;
643 mutex_unlock(&acpi_link_lock);
644
645 if (triggering)
646 *triggering = link->irq.triggering;
647 if (polarity)
648 *polarity = link->irq.polarity;
649 if (name)
650 *name = acpi_device_bid(link->device);
651 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
652 "Link %s is referenced\n",
653 acpi_device_bid(link->device)));
654 return (link->irq.active);
655 }
656
657 /*
658 * We don't change link's irq information here. After it is reenabled, we
659 * continue use the info
660 */
661 int acpi_pci_link_free_irq(acpi_handle handle)
662 {
663 struct acpi_device *device = NULL;
664 struct acpi_pci_link *link = NULL;
665 acpi_status result;
666
667
668 result = acpi_bus_get_device(handle, &device);
669 if (result) {
670 printk(KERN_ERR PREFIX "Invalid link device\n");
671 return -1;
672 }
673
674 link = acpi_driver_data(device);
675 if (!link) {
676 printk(KERN_ERR PREFIX "Invalid link context\n");
677 return -1;
678 }
679
680 mutex_lock(&acpi_link_lock);
681 if (!link->irq.initialized) {
682 mutex_unlock(&acpi_link_lock);
683 printk(KERN_ERR PREFIX "Link isn't initialized\n");
684 return -1;
685 }
686 #ifdef FUTURE_USE
687 /*
688 * The Link reference count allows us to _DISable an unused link
689 * and suspend time, and set it again on resume.
690 * However, 2.6.12 still has irq_router.resume
691 * which blindly restores the link state.
692 * So we disable the reference count method
693 * to prevent duplicate acpi_pci_link_set()
694 * which would harm some systems
695 */
696 link->refcnt--;
697 #endif
698 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
699 "Link %s is dereferenced\n",
700 acpi_device_bid(link->device)));
701
702 if (link->refcnt == 0) {
703 acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL);
704 }
705 mutex_unlock(&acpi_link_lock);
706 return (link->irq.active);
707 }
708
709 /* --------------------------------------------------------------------------
710 Driver Interface
711 -------------------------------------------------------------------------- */
712
713 static int acpi_pci_link_add(struct acpi_device *device)
714 {
715 int result = 0;
716 struct acpi_pci_link *link = NULL;
717 int i = 0;
718 int found = 0;
719
720
721 if (!device)
722 return -EINVAL;
723
724 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
725 if (!link)
726 return -ENOMEM;
727
728 link->device = device;
729 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
730 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
731 acpi_driver_data(device) = link;
732
733 mutex_lock(&acpi_link_lock);
734 result = acpi_pci_link_get_possible(link);
735 if (result)
736 goto end;
737
738 /* query and set link->irq.active */
739 acpi_pci_link_get_current(link);
740
741 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
742 acpi_device_bid(device));
743 for (i = 0; i < link->irq.possible_count; i++) {
744 if (link->irq.active == link->irq.possible[i]) {
745 printk(" *%d", link->irq.possible[i]);
746 found = 1;
747 } else
748 printk(" %d", link->irq.possible[i]);
749 }
750
751 printk(")");
752
753 if (!found)
754 printk(" *%d", link->irq.active);
755
756 if (!link->device->status.enabled)
757 printk(", disabled.");
758
759 printk("\n");
760
761 /* TBD: Acquire/release lock */
762 list_add_tail(&link->node, &acpi_link.entries);
763 acpi_link.count++;
764
765 end:
766 /* disable all links -- to be activated on use */
767 acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL);
768 mutex_unlock(&acpi_link_lock);
769
770 if (result)
771 kfree(link);
772
773 return result;
774 }
775
776 static int acpi_pci_link_resume(struct acpi_pci_link *link)
777 {
778
779 if (link->refcnt && link->irq.active && link->irq.initialized)
780 return (acpi_pci_link_set(link, link->irq.active));
781 else
782 return 0;
783 }
784
785 static int irqrouter_resume(struct sys_device *dev)
786 {
787 struct list_head *node = NULL;
788 struct acpi_pci_link *link = NULL;
789
790
791 /* Make sure SCI is enabled again (Apple firmware bug?) */
792 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
793
794 list_for_each(node, &acpi_link.entries) {
795 link = list_entry(node, struct acpi_pci_link, node);
796 if (!link) {
797 printk(KERN_ERR PREFIX "Invalid link context\n");
798 continue;
799 }
800 acpi_pci_link_resume(link);
801 }
802 return 0;
803 }
804
805 static int acpi_pci_link_remove(struct acpi_device *device, int type)
806 {
807 struct acpi_pci_link *link = NULL;
808
809
810 if (!device || !acpi_driver_data(device))
811 return -EINVAL;
812
813 link = acpi_driver_data(device);
814
815 mutex_lock(&acpi_link_lock);
816 list_del(&link->node);
817 mutex_unlock(&acpi_link_lock);
818
819 kfree(link);
820
821 return 0;
822 }
823
824 /*
825 * modify acpi_irq_penalty[] from cmdline
826 */
827 static int __init acpi_irq_penalty_update(char *str, int used)
828 {
829 int i;
830
831 for (i = 0; i < 16; i++) {
832 int retval;
833 int irq;
834
835 retval = get_option(&str, &irq);
836
837 if (!retval)
838 break; /* no number found */
839
840 if (irq < 0)
841 continue;
842
843 if (irq >= ACPI_MAX_IRQS)
844 continue;
845
846 if (used)
847 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
848 else
849 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
850
851 if (retval != 2) /* no next number */
852 break;
853 }
854 return 1;
855 }
856
857 /*
858 * We'd like PNP to call this routine for the
859 * single ISA_USED value for each legacy device.
860 * But instead it calls us with each POSSIBLE setting.
861 * There is no ISA_POSSIBLE weight, so we simply use
862 * the (small) PCI_USING penalty.
863 */
864 void acpi_penalize_isa_irq(int irq, int active)
865 {
866 if (active)
867 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
868 else
869 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
870 }
871
872 /*
873 * Over-ride default table to reserve additional IRQs for use by ISA
874 * e.g. acpi_irq_isa=5
875 * Useful for telling ACPI how not to interfere with your ISA sound card.
876 */
877 static int __init acpi_irq_isa(char *str)
878 {
879 return acpi_irq_penalty_update(str, 1);
880 }
881
882 __setup("acpi_irq_isa=", acpi_irq_isa);
883
884 /*
885 * Over-ride default table to free additional IRQs for use by PCI
886 * e.g. acpi_irq_pci=7,15
887 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
888 */
889 static int __init acpi_irq_pci(char *str)
890 {
891 return acpi_irq_penalty_update(str, 0);
892 }
893
894 __setup("acpi_irq_pci=", acpi_irq_pci);
895
896 static int __init acpi_irq_nobalance_set(char *str)
897 {
898 acpi_irq_balance = 0;
899 return 1;
900 }
901
902 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
903
904 int __init acpi_irq_balance_set(char *str)
905 {
906 acpi_irq_balance = 1;
907 return 1;
908 }
909
910 __setup("acpi_irq_balance", acpi_irq_balance_set);
911
912 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
913 static struct sysdev_class irqrouter_sysdev_class = {
914 set_kset_name("irqrouter"),
915 .resume = irqrouter_resume,
916 };
917
918 static struct sys_device device_irqrouter = {
919 .id = 0,
920 .cls = &irqrouter_sysdev_class,
921 };
922
923 static int __init irqrouter_init_sysfs(void)
924 {
925 int error;
926
927
928 if (acpi_disabled || acpi_noirq)
929 return 0;
930
931 error = sysdev_class_register(&irqrouter_sysdev_class);
932 if (!error)
933 error = sysdev_register(&device_irqrouter);
934
935 return error;
936 }
937
938 device_initcall(irqrouter_init_sysfs);
939
940 static int __init acpi_pci_link_init(void)
941 {
942
943 if (acpi_noirq)
944 return 0;
945
946 acpi_link.count = 0;
947 INIT_LIST_HEAD(&acpi_link.entries);
948
949 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
950 return -ENODEV;
951
952 return 0;
953 }
954
955 subsys_initcall(acpi_pci_link_init);
SocketAccessConTroL development