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[SCSI] zfcp: fix device registration issues
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / pci_link.c
blob07bc6dfe662b34aeb4c83d7476d6cee31c10c70a
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
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44
45 #define _COMPONENT ACPI_PCI_COMPONENT
46 ACPI_MODULE_NAME("pci_link")
47 #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
48 #define ACPI_PCI_LINK_HID "PNP0C0F"
49 #define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver"
50 #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
51 #define ACPI_PCI_LINK_FILE_INFO "info"
52 #define ACPI_PCI_LINK_FILE_STATUS "state"
53 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
54 static int acpi_pci_link_add(struct acpi_device *device);
55 static int acpi_pci_link_remove(struct acpi_device *device, int type);
56
57 static struct acpi_driver acpi_pci_link_driver = {
58 .name = ACPI_PCI_LINK_DRIVER_NAME,
59 .class = ACPI_PCI_LINK_CLASS,
60 .ids = ACPI_PCI_LINK_HID,
61 .ops = {
62 .add = acpi_pci_link_add,
63 .remove = acpi_pci_link_remove,
64 },
65 };
66
67 /*
68 * If a link is initialized, we never change its active and initialized
69 * later even the link is disable. Instead, we just repick the active irq
70 */
71 struct acpi_pci_link_irq {
72 u8 active; /* Current IRQ */
73 u8 triggering; /* All IRQs */
74 u8 polarity; /* All IRQs */
75 u8 resource_type;
76 u8 possible_count;
77 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
78 u8 initialized:1;
79 u8 reserved:7;
80 };
81
82 struct acpi_pci_link {
83 struct list_head node;
84 struct acpi_device *device;
85 acpi_handle handle;
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 DECLARE_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 = (struct acpi_pci_link *)context;
107 u32 i = 0;
108
109 ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
110
111 switch (resource->type) {
112 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
113 return_ACPI_STATUS(AE_OK);
114 case ACPI_RESOURCE_TYPE_IRQ:
115 {
116 struct acpi_resource_irq *p = &resource->data.irq;
117 if (!p || !p->interrupt_count) {
118 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
119 "Blank IRQ resource\n"));
120 return_ACPI_STATUS(AE_OK);
121 }
122 for (i = 0;
123 (i < p->interrupt_count
124 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
125 if (!p->interrupts[i]) {
126 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
127 "Invalid IRQ %d\n",
128 p->interrupts[i]));
129 continue;
130 }
131 link->irq.possible[i] = p->interrupts[i];
132 link->irq.possible_count++;
133 }
134 link->irq.triggering = p->triggering;
135 link->irq.polarity = p->polarity;
136 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
137 break;
138 }
139 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
140 {
141 struct acpi_resource_extended_irq *p =
142 &resource->data.extended_irq;
143 if (!p || !p->interrupt_count) {
144 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
145 "Blank EXT IRQ resource\n"));
146 return_ACPI_STATUS(AE_OK);
147 }
148 for (i = 0;
149 (i < p->interrupt_count
150 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
151 if (!p->interrupts[i]) {
152 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
153 "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 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
167 "Resource is not an IRQ entry\n"));
168 return_ACPI_STATUS(AE_OK);
169 }
170
171 return_ACPI_STATUS(AE_CTRL_TERMINATE);
172 }
173
174 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
175 {
176 acpi_status status;
177
178 ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
179
180 if (!link)
181 return_VALUE(-EINVAL);
182
183 status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
184 acpi_pci_link_check_possible, link);
185 if (ACPI_FAILURE(status)) {
186 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n"));
187 return_VALUE(-ENODEV);
188 }
189
190 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
191 "Found %d possible IRQs\n",
192 link->irq.possible_count));
193
194 return_VALUE(0);
195 }
196
197 static acpi_status
198 acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
199 {
200 int *irq = (int *)context;
201
202 ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
203
204 switch (resource->type) {
205 case ACPI_RESOURCE_TYPE_IRQ:
206 {
207 struct acpi_resource_irq *p = &resource->data.irq;
208 if (!p || !p->interrupt_count) {
209 /*
210 * IRQ descriptors may have no IRQ# bits set,
211 * particularly those those w/ _STA disabled
212 */
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
214 "Blank IRQ resource\n"));
215 return_ACPI_STATUS(AE_OK);
216 }
217 *irq = p->interrupts[0];
218 break;
219 }
220 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
221 {
222 struct acpi_resource_extended_irq *p =
223 &resource->data.extended_irq;
224 if (!p || !p->interrupt_count) {
225 /*
226 * extended IRQ descriptors must
227 * return at least 1 IRQ
228 */
229 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
230 "Blank EXT IRQ resource\n"));
231 return_ACPI_STATUS(AE_OK);
232 }
233 *irq = p->interrupts[0];
234 break;
235 }
236 break;
237 default:
238 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource %d isn't an IRQ\n", resource->type));
239 case ACPI_RESOURCE_TYPE_END_TAG:
240 return_ACPI_STATUS(AE_OK);
241 }
242 return_ACPI_STATUS(AE_CTRL_TERMINATE);
243 }
244
245 /*
246 * Run _CRS and set link->irq.active
247 *
248 * return value:
249 * 0 - success
250 * !0 - failure
251 */
252 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
253 {
254 int result = 0;
255 acpi_status status = AE_OK;
256 int irq = 0;
257
258 ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
259
260 if (!link || !link->handle)
261 return_VALUE(-EINVAL);
262
263 link->irq.active = 0;
264
265 /* in practice, status disabled is meaningless, ignore it */
266 if (acpi_strict) {
267 /* Query _STA, set link->device->status */
268 result = acpi_bus_get_status(link->device);
269 if (result) {
270 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
271 "Unable to read status\n"));
272 goto end;
273 }
274
275 if (!link->device->status.enabled) {
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
277 return_VALUE(0);
278 }
279 }
280
281 /*
282 * Query and parse _CRS to get the current IRQ assignment.
283 */
284
285 status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
286 acpi_pci_link_check_current, &irq);
287 if (ACPI_FAILURE(status)) {
288 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n"));
289 result = -ENODEV;
290 goto end;
291 }
292
293 if (acpi_strict && !irq) {
294 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n"));
295 result = -ENODEV;
296 }
297
298 link->irq.active = irq;
299
300 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
301
302 end:
303 return_VALUE(result);
304 }
305
306 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
307 {
308 int result = 0;
309 acpi_status status = AE_OK;
310 struct {
311 struct acpi_resource res;
312 struct acpi_resource end;
313 } *resource;
314 struct acpi_buffer buffer = { 0, NULL };
315
316 ACPI_FUNCTION_TRACE("acpi_pci_link_set");
317
318 if (!link || !irq)
319 return_VALUE(-EINVAL);
320
321 resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC);
322 if (!resource)
323 return_VALUE(-ENOMEM);
324
325 memset(resource, 0, sizeof(*resource) + 1);
326 buffer.length = sizeof(*resource) + 1;
327 buffer.pointer = resource;
328
329 switch (link->irq.resource_type) {
330 case ACPI_RESOURCE_TYPE_IRQ:
331 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
332 resource->res.length = sizeof(struct acpi_resource);
333 resource->res.data.irq.triggering = link->irq.triggering;
334 resource->res.data.irq.polarity =
335 link->irq.polarity;
336 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
337 resource->res.data.irq.sharable =
338 ACPI_EXCLUSIVE;
339 else
340 resource->res.data.irq.sharable = ACPI_SHARED;
341 resource->res.data.irq.interrupt_count = 1;
342 resource->res.data.irq.interrupts[0] = irq;
343 break;
344
345 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
346 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
347 resource->res.length = sizeof(struct acpi_resource);
348 resource->res.data.extended_irq.producer_consumer =
349 ACPI_CONSUMER;
350 resource->res.data.extended_irq.triggering =
351 link->irq.triggering;
352 resource->res.data.extended_irq.polarity =
353 link->irq.polarity;
354 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
355 resource->res.data.irq.sharable =
356 ACPI_EXCLUSIVE;
357 else
358 resource->res.data.irq.sharable = ACPI_SHARED;
359 resource->res.data.extended_irq.interrupt_count = 1;
360 resource->res.data.extended_irq.interrupts[0] = irq;
361 /* ignore resource_source, it's optional */
362 break;
363 default:
364 printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
365 result = -EINVAL;
366 goto end;
367
368 }
369 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
370
371 /* Attempt to set the resource */
372 status = acpi_set_current_resources(link->handle, &buffer);
373
374 /* check for total failure */
375 if (ACPI_FAILURE(status)) {
376 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
377 result = -ENODEV;
378 goto end;
379 }
380
381 /* Query _STA, set device->status */
382 result = acpi_bus_get_status(link->device);
383 if (result) {
384 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
385 goto end;
386 }
387 if (!link->device->status.enabled) {
388 printk(KERN_WARNING PREFIX
389 "%s [%s] disabled and referenced, BIOS bug.\n",
390 acpi_device_name(link->device),
391 acpi_device_bid(link->device));
392 }
393
394 /* Query _CRS, set link->irq.active */
395 result = acpi_pci_link_get_current(link);
396 if (result) {
397 goto end;
398 }
399
400 /*
401 * Is current setting not what we set?
402 * set link->irq.active
403 */
404 if (link->irq.active != irq) {
405 /*
406 * policy: when _CRS doesn't return what we just _SRS
407 * assume _SRS worked and override _CRS value.
408 */
409 printk(KERN_WARNING PREFIX
410 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
411 acpi_device_name(link->device),
412 acpi_device_bid(link->device), link->irq.active, irq);
413 link->irq.active = irq;
414 }
415
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
417
418 end:
419 kfree(resource);
420 return_VALUE(result);
421 }
422
423 /* --------------------------------------------------------------------------
424 PCI Link IRQ Management
425 -------------------------------------------------------------------------- */
426
427 /*
428 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
429 * Link Devices to move the PIRQs around to minimize sharing.
430 *
431 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
432 * that the BIOS has already set to active. This is necessary because
433 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
434 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
435 * even if acpi_irq_nobalance is set.
436 *
437 * A tables of penalties avoids directing PCI interrupts to well known
438 * ISA IRQs. Boot params are available to over-ride the default table:
439 *
440 * List interrupts that are free for PCI use.
441 * acpi_irq_pci=n[,m]
442 *
443 * List interrupts that should not be used for PCI:
444 * acpi_irq_isa=n[,m]
445 *
446 * Note that PCI IRQ routers have a list of possible IRQs,
447 * which may not include the IRQs this table says are available.
448 *
449 * Since this heuristic can't tell the difference between a link
450 * that no device will attach to, vs. a link which may be shared
451 * by multiple active devices -- it is not optimal.
452 *
453 * If interrupt performance is that important, get an IO-APIC system
454 * with a pin dedicated to each device. Or for that matter, an MSI
455 * enabled system.
456 */
457
458 #define ACPI_MAX_IRQS 256
459 #define ACPI_MAX_ISA_IRQ 16
460
461 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
462 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
463 #define PIRQ_PENALTY_PCI_USING (16*16*16)
464 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
465 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
466 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
467
468 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
469 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
470 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
471 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
472 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
473 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
474 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
475 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
476 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
477 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
478 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
479 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
480 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
481 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
482 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
483 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
484 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
485 /* >IRQ15 */
486 };
487
488 int __init acpi_irq_penalty_init(void)
489 {
490 struct list_head *node = NULL;
491 struct acpi_pci_link *link = NULL;
492 int i = 0;
493
494 ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
495
496 /*
497 * Update penalties to facilitate IRQ balancing.
498 */
499 list_for_each(node, &acpi_link.entries) {
500
501 link = list_entry(node, struct acpi_pci_link, node);
502 if (!link) {
503 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
504 "Invalid link context\n"));
505 continue;
506 }
507
508 /*
509 * reflect the possible and active irqs in the penalty table --
510 * useful for breaking ties.
511 */
512 if (link->irq.possible_count) {
513 int penalty =
514 PIRQ_PENALTY_PCI_POSSIBLE /
515 link->irq.possible_count;
516
517 for (i = 0; i < link->irq.possible_count; i++) {
518 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
519 acpi_irq_penalty[link->irq.
520 possible[i]] +=
521 penalty;
522 }
523
524 } else if (link->irq.active) {
525 acpi_irq_penalty[link->irq.active] +=
526 PIRQ_PENALTY_PCI_POSSIBLE;
527 }
528 }
529 /* Add a penalty for the SCI */
530 acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
531
532 return_VALUE(0);
533 }
534
535 static int acpi_irq_balance; /* 0: static, 1: balance */
536
537 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
538 {
539 int irq;
540 int i;
541
542 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
543
544 if (link->irq.initialized) {
545 if (link->refcnt == 0)
546 /* This means the link is disabled but initialized */
547 acpi_pci_link_set(link, link->irq.active);
548 return_VALUE(0);
549 }
550
551 /*
552 * search for active IRQ in list of possible IRQs.
553 */
554 for (i = 0; i < link->irq.possible_count; ++i) {
555 if (link->irq.active == link->irq.possible[i])
556 break;
557 }
558 /*
559 * forget active IRQ that is not in possible list
560 */
561 if (i == link->irq.possible_count) {
562 if (acpi_strict)
563 printk(KERN_WARNING PREFIX "_CRS %d not found"
564 " in _PRS\n", link->irq.active);
565 link->irq.active = 0;
566 }
567
568 /*
569 * if active found, use it; else pick entry from end of possible list.
570 */
571 if (link->irq.active) {
572 irq = link->irq.active;
573 } else {
574 irq = link->irq.possible[link->irq.possible_count - 1];
575 }
576
577 if (acpi_irq_balance || !link->irq.active) {
578 /*
579 * Select the best IRQ. This is done in reverse to promote
580 * the use of IRQs 9, 10, 11, and >15.
581 */
582 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
583 if (acpi_irq_penalty[irq] >
584 acpi_irq_penalty[link->irq.possible[i]])
585 irq = link->irq.possible[i];
586 }
587 }
588
589 /* Attempt to enable the link device at this IRQ. */
590 if (acpi_pci_link_set(link, irq)) {
591 printk(PREFIX
592 "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
593 "Try pci=noacpi or acpi=off\n",
594 acpi_device_name(link->device),
595 acpi_device_bid(link->device));
596 return_VALUE(-ENODEV);
597 } else {
598 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
599 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
600 acpi_device_name(link->device),
601 acpi_device_bid(link->device), link->irq.active);
602 }
603
604 link->irq.initialized = 1;
605
606 return_VALUE(0);
607 }
608
609 /*
610 * acpi_pci_link_allocate_irq
611 * success: return IRQ >= 0
612 * failure: return -1
613 */
614
615 int
616 acpi_pci_link_allocate_irq(acpi_handle handle,
617 int index,
618 int *triggering, int *polarity, char **name)
619 {
620 int result = 0;
621 struct acpi_device *device = NULL;
622 struct acpi_pci_link *link = NULL;
623
624 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq");
625
626 result = acpi_bus_get_device(handle, &device);
627 if (result) {
628 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
629 return_VALUE(-1);
630 }
631
632 link = (struct acpi_pci_link *)acpi_driver_data(device);
633 if (!link) {
634 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
635 return_VALUE(-1);
636 }
637
638 /* TBD: Support multiple index (IRQ) entries per Link Device */
639 if (index) {
640 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
641 return_VALUE(-1);
642 }
643
644 down(&acpi_link_lock);
645 if (acpi_pci_link_allocate(link)) {
646 up(&acpi_link_lock);
647 return_VALUE(-1);
648 }
649
650 if (!link->irq.active) {
651 up(&acpi_link_lock);
652 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
653 return_VALUE(-1);
654 }
655 link->refcnt++;
656 up(&acpi_link_lock);
657
658 if (triggering)
659 *triggering = link->irq.triggering;
660 if (polarity)
661 *polarity = link->irq.polarity;
662 if (name)
663 *name = acpi_device_bid(link->device);
664 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
665 "Link %s is referenced\n",
666 acpi_device_bid(link->device)));
667 return_VALUE(link->irq.active);
668 }
669
670 /*
671 * We don't change link's irq information here. After it is reenabled, we
672 * continue use the info
673 */
674 int acpi_pci_link_free_irq(acpi_handle handle)
675 {
676 struct acpi_device *device = NULL;
677 struct acpi_pci_link *link = NULL;
678 acpi_status result;
679
680 ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq");
681
682 result = acpi_bus_get_device(handle, &device);
683 if (result) {
684 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
685 return_VALUE(-1);
686 }
687
688 link = (struct acpi_pci_link *)acpi_driver_data(device);
689 if (!link) {
690 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
691 return_VALUE(-1);
692 }
693
694 down(&acpi_link_lock);
695 if (!link->irq.initialized) {
696 up(&acpi_link_lock);
697 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n"));
698 return_VALUE(-1);
699 }
700 #ifdef FUTURE_USE
701 /*
702 * The Link reference count allows us to _DISable an unused link
703 * and suspend time, and set it again on resume.
704 * However, 2.6.12 still has irq_router.resume
705 * which blindly restores the link state.
706 * So we disable the reference count method
707 * to prevent duplicate acpi_pci_link_set()
708 * which would harm some systems
709 */
710 link->refcnt--;
711 #endif
712 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
713 "Link %s is dereferenced\n",
714 acpi_device_bid(link->device)));
715
716 if (link->refcnt == 0) {
717 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
718 }
719 up(&acpi_link_lock);
720 return_VALUE(link->irq.active);
721 }
722
723 /* --------------------------------------------------------------------------
724 Driver Interface
725 -------------------------------------------------------------------------- */
726
727 static int acpi_pci_link_add(struct acpi_device *device)
728 {
729 int result = 0;
730 struct acpi_pci_link *link = NULL;
731 int i = 0;
732 int found = 0;
733
734 ACPI_FUNCTION_TRACE("acpi_pci_link_add");
735
736 if (!device)
737 return_VALUE(-EINVAL);
738
739 link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
740 if (!link)
741 return_VALUE(-ENOMEM);
742 memset(link, 0, sizeof(struct acpi_pci_link));
743
744 link->device = device;
745 link->handle = device->handle;
746 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
747 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
748 acpi_driver_data(device) = link;
749
750 down(&acpi_link_lock);
751 result = acpi_pci_link_get_possible(link);
752 if (result)
753 goto end;
754
755 /* query and set link->irq.active */
756 acpi_pci_link_get_current(link);
757
758 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
759 acpi_device_bid(device));
760 for (i = 0; i < link->irq.possible_count; i++) {
761 if (link->irq.active == link->irq.possible[i]) {
762 printk(" *%d", link->irq.possible[i]);
763 found = 1;
764 } else
765 printk(" %d", link->irq.possible[i]);
766 }
767
768 printk(")");
769
770 if (!found)
771 printk(" *%d", link->irq.active);
772
773 if (!link->device->status.enabled)
774 printk(", disabled.");
775
776 printk("\n");
777
778 /* TBD: Acquire/release lock */
779 list_add_tail(&link->node, &acpi_link.entries);
780 acpi_link.count++;
781
782 end:
783 /* disable all links -- to be activated on use */
784 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
785 up(&acpi_link_lock);
786
787 if (result)
788 kfree(link);
789
790 return_VALUE(result);
791 }
792
793 static int acpi_pci_link_resume(struct acpi_pci_link *link)
794 {
795 ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
796
797 if (link->refcnt && link->irq.active && link->irq.initialized)
798 return_VALUE(acpi_pci_link_set(link, link->irq.active));
799 else
800 return_VALUE(0);
801 }
802
803 /*
804 * FIXME: this is a workaround to avoid nasty warning. It will be removed
805 * after every device calls pci_disable_device in .resume.
806 */
807 int acpi_in_resume;
808 static int irqrouter_resume(struct sys_device *dev)
809 {
810 struct list_head *node = NULL;
811 struct acpi_pci_link *link = NULL;
812
813 ACPI_FUNCTION_TRACE("irqrouter_resume");
814
815 acpi_in_resume = 1;
816 list_for_each(node, &acpi_link.entries) {
817 link = list_entry(node, struct acpi_pci_link, node);
818 if (!link) {
819 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
820 "Invalid link context\n"));
821 continue;
822 }
823 acpi_pci_link_resume(link);
824 }
825 acpi_in_resume = 0;
826 return_VALUE(0);
827 }
828
829 static int acpi_pci_link_remove(struct acpi_device *device, int type)
830 {
831 struct acpi_pci_link *link = NULL;
832
833 ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
834
835 if (!device || !acpi_driver_data(device))
836 return_VALUE(-EINVAL);
837
838 link = (struct acpi_pci_link *)acpi_driver_data(device);
839
840 down(&acpi_link_lock);
841 list_del(&link->node);
842 up(&acpi_link_lock);
843
844 kfree(link);
845
846 return_VALUE(0);
847 }
848
849 /*
850 * modify acpi_irq_penalty[] from cmdline
851 */
852 static int __init acpi_irq_penalty_update(char *str, int used)
853 {
854 int i;
855
856 for (i = 0; i < 16; i++) {
857 int retval;
858 int irq;
859
860 retval = get_option(&str, &irq);
861
862 if (!retval)
863 break; /* no number found */
864
865 if (irq < 0)
866 continue;
867
868 if (irq >= ACPI_MAX_IRQS)
869 continue;
870
871 if (used)
872 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
873 else
874 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
875
876 if (retval != 2) /* no next number */
877 break;
878 }
879 return 1;
880 }
881
882 /*
883 * We'd like PNP to call this routine for the
884 * single ISA_USED value for each legacy device.
885 * But instead it calls us with each POSSIBLE setting.
886 * There is no ISA_POSSIBLE weight, so we simply use
887 * the (small) PCI_USING penalty.
888 */
889 void acpi_penalize_isa_irq(int irq, int active)
890 {
891 if (active)
892 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
893 else
894 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
895 }
896
897 /*
898 * Over-ride default table to reserve additional IRQs for use by ISA
899 * e.g. acpi_irq_isa=5
900 * Useful for telling ACPI how not to interfere with your ISA sound card.
901 */
902 static int __init acpi_irq_isa(char *str)
903 {
904 return acpi_irq_penalty_update(str, 1);
905 }
906
907 __setup("acpi_irq_isa=", acpi_irq_isa);
908
909 /*
910 * Over-ride default table to free additional IRQs for use by PCI
911 * e.g. acpi_irq_pci=7,15
912 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
913 */
914 static int __init acpi_irq_pci(char *str)
915 {
916 return acpi_irq_penalty_update(str, 0);
917 }
918
919 __setup("acpi_irq_pci=", acpi_irq_pci);
920
921 static int __init acpi_irq_nobalance_set(char *str)
922 {
923 acpi_irq_balance = 0;
924 return 1;
925 }
926
927 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
928
929 int __init acpi_irq_balance_set(char *str)
930 {
931 acpi_irq_balance = 1;
932 return 1;
933 }
934
935 __setup("acpi_irq_balance", acpi_irq_balance_set);
936
937 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
938 static struct sysdev_class irqrouter_sysdev_class = {
939 set_kset_name("irqrouter"),
940 .resume = irqrouter_resume,
941 };
942
943 static struct sys_device device_irqrouter = {
944 .id = 0,
945 .cls = &irqrouter_sysdev_class,
946 };
947
948 static int __init irqrouter_init_sysfs(void)
949 {
950 int error;
951
952 ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
953
954 if (acpi_disabled || acpi_noirq)
955 return_VALUE(0);
956
957 error = sysdev_class_register(&irqrouter_sysdev_class);
958 if (!error)
959 error = sysdev_register(&device_irqrouter);
960
961 return_VALUE(error);
962 }
963
964 device_initcall(irqrouter_init_sysfs);
965
966 static int __init acpi_pci_link_init(void)
967 {
968 ACPI_FUNCTION_TRACE("acpi_pci_link_init");
969
970 if (acpi_noirq)
971 return_VALUE(0);
972
973 acpi_link.count = 0;
974 INIT_LIST_HEAD(&acpi_link.entries);
975
976 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
977 return_VALUE(-ENODEV);
978
979 return_VALUE(0);
980 }
981
982 subsys_initcall(acpi_pci_link_init);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree