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Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / acpi / pci_link.c
blob481e633bbf41b33c16b6c7def7ff16e8252592ea
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_HID "PNP0C0F"
50 #define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver"
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 static int acpi_pci_link_add(struct acpi_device *device);
56 static int acpi_pci_link_remove(struct acpi_device *device, int type);
57
58 static struct acpi_driver acpi_pci_link_driver = {
59 .name = ACPI_PCI_LINK_DRIVER_NAME,
60 .class = ACPI_PCI_LINK_CLASS,
61 .ids = ACPI_PCI_LINK_HID,
62 .ops = {
63 .add = acpi_pci_link_add,
64 .remove = acpi_pci_link_remove,
65 },
66 };
67
68 /*
69 * If a link is initialized, we never change its active and initialized
70 * later even the link is disable. Instead, we just repick the active irq
71 */
72 struct acpi_pci_link_irq {
73 u8 active; /* Current IRQ */
74 u8 triggering; /* All IRQs */
75 u8 polarity; /* All IRQs */
76 u8 resource_type;
77 u8 possible_count;
78 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
79 u8 initialized:1;
80 u8 reserved:7;
81 };
82
83 struct acpi_pci_link {
84 struct list_head node;
85 struct acpi_device *device;
86 struct acpi_pci_link_irq irq;
87 int refcnt;
88 };
89
90 static struct {
91 int count;
92 struct list_head entries;
93 } acpi_link;
94 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
104 acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
105 {
106 struct acpi_pci_link *link = context;
107 u32 i = 0;
108
109
110 switch (resource->type) {
111 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
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 printk(KERN_WARNING PREFIX "Blank IRQ resource\n");
118 return AE_OK;
119 }
120 for (i = 0;
121 (i < p->interrupt_count
122 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
123 if (!p->interrupts[i]) {
124 printk(KERN_WARNING PREFIX "Invalid 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 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 "Invalid IRQ %d\n",
150 p->interrupts[i]);
151 continue;
152 }
153 link->irq.possible[i] = p->interrupts[i];
154 link->irq.possible_count++;
155 }
156 link->irq.triggering = p->triggering;
157 link->irq.polarity = p->polarity;
158 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
159 break;
160 }
161 default:
162 printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n");
163 return AE_OK;
164 }
165
166 return AE_CTRL_TERMINATE;
167 }
168
169 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
170 {
171 acpi_status status;
172
173
174 if (!link)
175 return -EINVAL;
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
192 acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
193 {
194 int *irq = (int *)context;
195
196
197 switch (resource->type) {
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 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 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 "Resource %d isn't an IRQ\n", resource->type);
232 case ACPI_RESOURCE_TYPE_END_TAG:
233 return AE_OK;
234 }
235 return AE_CTRL_TERMINATE;
236 }
237
238 /*
239 * Run _CRS and set link->irq.active
240 *
241 * return value:
242 * 0 - success
243 * !0 - failure
244 */
245 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
246 {
247 int result = 0;
248 acpi_status status = AE_OK;
249 int irq = 0;
250
251 if (!link)
252 return -EINVAL;
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 = 0;
299 acpi_status status = AE_OK;
300 struct {
301 struct acpi_resource res;
302 struct acpi_resource end;
303 } *resource;
304 struct acpi_buffer buffer = { 0, NULL };
305
306
307 if (!link || !irq)
308 return -EINVAL;
309
310 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
311 if (!resource)
312 return -ENOMEM;
313
314 buffer.length = sizeof(*resource) + 1;
315 buffer.pointer = resource;
316
317 switch (link->irq.resource_type) {
318 case ACPI_RESOURCE_TYPE_IRQ:
319 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
320 resource->res.length = sizeof(struct acpi_resource);
321 resource->res.data.irq.triggering = link->irq.triggering;
322 resource->res.data.irq.polarity =
323 link->irq.polarity;
324 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
325 resource->res.data.irq.sharable =
326 ACPI_EXCLUSIVE;
327 else
328 resource->res.data.irq.sharable = ACPI_SHARED;
329 resource->res.data.irq.interrupt_count = 1;
330 resource->res.data.irq.interrupts[0] = irq;
331 break;
332
333 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
334 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
335 resource->res.length = sizeof(struct acpi_resource);
336 resource->res.data.extended_irq.producer_consumer =
337 ACPI_CONSUMER;
338 resource->res.data.extended_irq.triggering =
339 link->irq.triggering;
340 resource->res.data.extended_irq.polarity =
341 link->irq.polarity;
342 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
343 resource->res.data.irq.sharable =
344 ACPI_EXCLUSIVE;
345 else
346 resource->res.data.irq.sharable = ACPI_SHARED;
347 resource->res.data.extended_irq.interrupt_count = 1;
348 resource->res.data.extended_irq.interrupts[0] = irq;
349 /* ignore resource_source, it's optional */
350 break;
351 default:
352 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
353 result = -EINVAL;
354 goto end;
355
356 }
357 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
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 list_head *node = NULL;
479 struct acpi_pci_link *link = NULL;
480 int i = 0;
481
482
483 /*
484 * Update penalties to facilitate IRQ balancing.
485 */
486 list_for_each(node, &acpi_link.entries) {
487
488 link = list_entry(node, struct acpi_pci_link, node);
489 if (!link) {
490 printk(KERN_ERR PREFIX "Invalid link context\n");
491 continue;
492 }
493
494 /*
495 * reflect the possible and active irqs in the penalty table --
496 * useful for breaking ties.
497 */
498 if (link->irq.possible_count) {
499 int penalty =
500 PIRQ_PENALTY_PCI_POSSIBLE /
501 link->irq.possible_count;
502
503 for (i = 0; i < link->irq.possible_count; i++) {
504 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
505 acpi_irq_penalty[link->irq.
506 possible[i]] +=
507 penalty;
508 }
509
510 } else if (link->irq.active) {
511 acpi_irq_penalty[link->irq.active] +=
512 PIRQ_PENALTY_PCI_POSSIBLE;
513 }
514 }
515 /* Add a penalty for the SCI */
516 acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
517
518 return 0;
519 }
520
521 static int acpi_irq_balance; /* 0: static, 1: balance */
522
523 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
524 {
525 int irq;
526 int i;
527
528
529 if (link->irq.initialized) {
530 if (link->refcnt == 0)
531 /* This means the link is disabled but initialized */
532 acpi_pci_link_set(link, link->irq.active);
533 return 0;
534 }
535
536 /*
537 * search for active IRQ in list of possible IRQs.
538 */
539 for (i = 0; i < link->irq.possible_count; ++i) {
540 if (link->irq.active == link->irq.possible[i])
541 break;
542 }
543 /*
544 * forget active IRQ that is not in possible list
545 */
546 if (i == link->irq.possible_count) {
547 if (acpi_strict)
548 printk(KERN_WARNING PREFIX "_CRS %d not found"
549 " in _PRS\n", link->irq.active);
550 link->irq.active = 0;
551 }
552
553 /*
554 * if active found, use it; else pick entry from end of possible list.
555 */
556 if (link->irq.active) {
557 irq = link->irq.active;
558 } else {
559 irq = link->irq.possible[link->irq.possible_count - 1];
560 }
561
562 if (acpi_irq_balance || !link->irq.active) {
563 /*
564 * Select the best IRQ. This is done in reverse to promote
565 * the use of IRQs 9, 10, 11, and >15.
566 */
567 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
568 if (acpi_irq_penalty[irq] >
569 acpi_irq_penalty[link->irq.possible[i]])
570 irq = link->irq.possible[i];
571 }
572 }
573
574 /* Attempt to enable the link device at this IRQ. */
575 if (acpi_pci_link_set(link, irq)) {
576 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
577 "Try pci=noacpi or acpi=off\n",
578 acpi_device_name(link->device),
579 acpi_device_bid(link->device));
580 return -ENODEV;
581 } else {
582 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
583 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
584 acpi_device_name(link->device),
585 acpi_device_bid(link->device), link->irq.active);
586 }
587
588 link->irq.initialized = 1;
589
590 return 0;
591 }
592
593 /*
594 * acpi_pci_link_allocate_irq
595 * success: return IRQ >= 0
596 * failure: return -1
597 */
598
599 int
600 acpi_pci_link_allocate_irq(acpi_handle handle,
601 int index,
602 int *triggering, int *polarity, char **name)
603 {
604 int result = 0;
605 struct acpi_device *device = NULL;
606 struct acpi_pci_link *link = NULL;
607
608
609 result = acpi_bus_get_device(handle, &device);
610 if (result) {
611 printk(KERN_ERR PREFIX "Invalid link device\n");
612 return -1;
613 }
614
615 link = acpi_driver_data(device);
616 if (!link) {
617 printk(KERN_ERR PREFIX "Invalid link context\n");
618 return -1;
619 }
620
621 /* TBD: Support multiple index (IRQ) entries per Link Device */
622 if (index) {
623 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
624 return -1;
625 }
626
627 mutex_lock(&acpi_link_lock);
628 if (acpi_pci_link_allocate(link)) {
629 mutex_unlock(&acpi_link_lock);
630 return -1;
631 }
632
633 if (!link->irq.active) {
634 mutex_unlock(&acpi_link_lock);
635 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
636 return -1;
637 }
638 link->refcnt++;
639 mutex_unlock(&acpi_link_lock);
640
641 if (triggering)
642 *triggering = link->irq.triggering;
643 if (polarity)
644 *polarity = link->irq.polarity;
645 if (name)
646 *name = acpi_device_bid(link->device);
647 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
648 "Link %s is referenced\n",
649 acpi_device_bid(link->device)));
650 return (link->irq.active);
651 }
652
653 /*
654 * We don't change link's irq information here. After it is reenabled, we
655 * continue use the info
656 */
657 int acpi_pci_link_free_irq(acpi_handle handle)
658 {
659 struct acpi_device *device = NULL;
660 struct acpi_pci_link *link = NULL;
661 acpi_status result;
662
663
664 result = acpi_bus_get_device(handle, &device);
665 if (result) {
666 printk(KERN_ERR PREFIX "Invalid link device\n");
667 return -1;
668 }
669
670 link = acpi_driver_data(device);
671 if (!link) {
672 printk(KERN_ERR PREFIX "Invalid link context\n");
673 return -1;
674 }
675
676 mutex_lock(&acpi_link_lock);
677 if (!link->irq.initialized) {
678 mutex_unlock(&acpi_link_lock);
679 printk(KERN_ERR PREFIX "Link isn't initialized\n");
680 return -1;
681 }
682 #ifdef FUTURE_USE
683 /*
684 * The Link reference count allows us to _DISable an unused link
685 * and suspend time, and set it again on resume.
686 * However, 2.6.12 still has irq_router.resume
687 * which blindly restores the link state.
688 * So we disable the reference count method
689 * to prevent duplicate acpi_pci_link_set()
690 * which would harm some systems
691 */
692 link->refcnt--;
693 #endif
694 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
695 "Link %s is dereferenced\n",
696 acpi_device_bid(link->device)));
697
698 if (link->refcnt == 0) {
699 acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL);
700 }
701 mutex_unlock(&acpi_link_lock);
702 return (link->irq.active);
703 }
704
705 /* --------------------------------------------------------------------------
706 Driver Interface
707 -------------------------------------------------------------------------- */
708
709 static int acpi_pci_link_add(struct acpi_device *device)
710 {
711 int result = 0;
712 struct acpi_pci_link *link = NULL;
713 int i = 0;
714 int found = 0;
715
716
717 if (!device)
718 return -EINVAL;
719
720 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
721 if (!link)
722 return -ENOMEM;
723
724 link->device = device;
725 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
726 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
727 acpi_driver_data(device) = link;
728
729 mutex_lock(&acpi_link_lock);
730 result = acpi_pci_link_get_possible(link);
731 if (result)
732 goto end;
733
734 /* query and set link->irq.active */
735 acpi_pci_link_get_current(link);
736
737 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
738 acpi_device_bid(device));
739 for (i = 0; i < link->irq.possible_count; i++) {
740 if (link->irq.active == link->irq.possible[i]) {
741 printk(" *%d", link->irq.possible[i]);
742 found = 1;
743 } else
744 printk(" %d", link->irq.possible[i]);
745 }
746
747 printk(")");
748
749 if (!found)
750 printk(" *%d", link->irq.active);
751
752 if (!link->device->status.enabled)
753 printk(", disabled.");
754
755 printk("\n");
756
757 /* TBD: Acquire/release lock */
758 list_add_tail(&link->node, &acpi_link.entries);
759 acpi_link.count++;
760
761 end:
762 /* disable all links -- to be activated on use */
763 acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL);
764 mutex_unlock(&acpi_link_lock);
765
766 if (result)
767 kfree(link);
768
769 return result;
770 }
771
772 static int acpi_pci_link_resume(struct acpi_pci_link *link)
773 {
774
775 if (link->refcnt && link->irq.active && link->irq.initialized)
776 return (acpi_pci_link_set(link, link->irq.active));
777 else
778 return 0;
779 }
780
781 static int irqrouter_resume(struct sys_device *dev)
782 {
783 struct list_head *node = NULL;
784 struct acpi_pci_link *link = NULL;
785
786
787 /* Make sure SCI is enabled again (Apple firmware bug?) */
788 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK);
789
790 list_for_each(node, &acpi_link.entries) {
791 link = list_entry(node, struct acpi_pci_link, node);
792 if (!link) {
793 printk(KERN_ERR PREFIX "Invalid link context\n");
794 continue;
795 }
796 acpi_pci_link_resume(link);
797 }
798 return 0;
799 }
800
801 static int acpi_pci_link_remove(struct acpi_device *device, int type)
802 {
803 struct acpi_pci_link *link = NULL;
804
805
806 if (!device || !acpi_driver_data(device))
807 return -EINVAL;
808
809 link = acpi_driver_data(device);
810
811 mutex_lock(&acpi_link_lock);
812 list_del(&link->node);
813 mutex_unlock(&acpi_link_lock);
814
815 kfree(link);
816
817 return 0;
818 }
819
820 /*
821 * modify acpi_irq_penalty[] from cmdline
822 */
823 static int __init acpi_irq_penalty_update(char *str, int used)
824 {
825 int i;
826
827 for (i = 0; i < 16; i++) {
828 int retval;
829 int irq;
830
831 retval = get_option(&str, &irq);
832
833 if (!retval)
834 break; /* no number found */
835
836 if (irq < 0)
837 continue;
838
839 if (irq >= ACPI_MAX_IRQS)
840 continue;
841
842 if (used)
843 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
844 else
845 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
846
847 if (retval != 2) /* no next number */
848 break;
849 }
850 return 1;
851 }
852
853 /*
854 * We'd like PNP to call this routine for the
855 * single ISA_USED value for each legacy device.
856 * But instead it calls us with each POSSIBLE setting.
857 * There is no ISA_POSSIBLE weight, so we simply use
858 * the (small) PCI_USING penalty.
859 */
860 void acpi_penalize_isa_irq(int irq, int active)
861 {
862 if (active)
863 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
864 else
865 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
866 }
867
868 /*
869 * Over-ride default table to reserve additional IRQs for use by ISA
870 * e.g. acpi_irq_isa=5
871 * Useful for telling ACPI how not to interfere with your ISA sound card.
872 */
873 static int __init acpi_irq_isa(char *str)
874 {
875 return acpi_irq_penalty_update(str, 1);
876 }
877
878 __setup("acpi_irq_isa=", acpi_irq_isa);
879
880 /*
881 * Over-ride default table to free additional IRQs for use by PCI
882 * e.g. acpi_irq_pci=7,15
883 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
884 */
885 static int __init acpi_irq_pci(char *str)
886 {
887 return acpi_irq_penalty_update(str, 0);
888 }
889
890 __setup("acpi_irq_pci=", acpi_irq_pci);
891
892 static int __init acpi_irq_nobalance_set(char *str)
893 {
894 acpi_irq_balance = 0;
895 return 1;
896 }
897
898 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
899
900 int __init acpi_irq_balance_set(char *str)
901 {
902 acpi_irq_balance = 1;
903 return 1;
904 }
905
906 __setup("acpi_irq_balance", acpi_irq_balance_set);
907
908 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
909 static struct sysdev_class irqrouter_sysdev_class = {
910 set_kset_name("irqrouter"),
911 .resume = irqrouter_resume,
912 };
913
914 static struct sys_device device_irqrouter = {
915 .id = 0,
916 .cls = &irqrouter_sysdev_class,
917 };
918
919 static int __init irqrouter_init_sysfs(void)
920 {
921 int error;
922
923
924 if (acpi_disabled || acpi_noirq)
925 return 0;
926
927 error = sysdev_class_register(&irqrouter_sysdev_class);
928 if (!error)
929 error = sysdev_register(&device_irqrouter);
930
931 return error;
932 }
933
934 device_initcall(irqrouter_init_sysfs);
935
936 static int __init acpi_pci_link_init(void)
937 {
938
939 if (acpi_noirq)
940 return 0;
941
942 acpi_link.count = 0;
943 INIT_LIST_HEAD(&acpi_link.entries);
944
945 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
946 return -ENODEV;
947
948 return 0;
949 }
950
951 subsys_initcall(acpi_pci_link_init);
Linux with added FPC-III support