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1da177e4 LT |
1 | /* |
2 | * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) | |
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 | ||
27 | #include <linux/config.h> | |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/pm.h> | |
36 | #include <linux/pci.h> | |
37 | #include <linux/acpi.h> | |
38 | #include <acpi/acpi_bus.h> | |
39 | #include <acpi/acpi_drivers.h> | |
40 | ||
41 | ||
42 | #define _COMPONENT ACPI_PCI_COMPONENT | |
43 | ACPI_MODULE_NAME ("pci_irq") | |
44 | ||
45 | static struct acpi_prt_list acpi_prt; | |
46 | static DEFINE_SPINLOCK(acpi_prt_lock); | |
47 | ||
48 | /* -------------------------------------------------------------------------- | |
49 | PCI IRQ Routing Table (PRT) Support | |
50 | -------------------------------------------------------------------------- */ | |
51 | ||
52 | static struct acpi_prt_entry * | |
53 | acpi_pci_irq_find_prt_entry ( | |
54 | int segment, | |
55 | int bus, | |
56 | int device, | |
57 | int pin) | |
58 | { | |
59 | struct list_head *node = NULL; | |
60 | struct acpi_prt_entry *entry = NULL; | |
61 | ||
62 | ACPI_FUNCTION_TRACE("acpi_pci_irq_find_prt_entry"); | |
63 | ||
64 | if (!acpi_prt.count) | |
65 | return_PTR(NULL); | |
66 | ||
67 | /* | |
68 | * Parse through all PRT entries looking for a match on the specified | |
69 | * PCI device's segment, bus, device, and pin (don't care about func). | |
70 | * | |
71 | */ | |
72 | spin_lock(&acpi_prt_lock); | |
73 | list_for_each(node, &acpi_prt.entries) { | |
74 | entry = list_entry(node, struct acpi_prt_entry, node); | |
75 | if ((segment == entry->id.segment) | |
76 | && (bus == entry->id.bus) | |
77 | && (device == entry->id.device) | |
78 | && (pin == entry->pin)) { | |
79 | spin_unlock(&acpi_prt_lock); | |
80 | return_PTR(entry); | |
81 | } | |
82 | } | |
83 | ||
84 | spin_unlock(&acpi_prt_lock); | |
85 | return_PTR(NULL); | |
86 | } | |
87 | ||
88 | ||
89 | static int | |
90 | acpi_pci_irq_add_entry ( | |
91 | acpi_handle handle, | |
92 | int segment, | |
93 | int bus, | |
94 | struct acpi_pci_routing_table *prt) | |
95 | { | |
96 | struct acpi_prt_entry *entry = NULL; | |
97 | ||
98 | ACPI_FUNCTION_TRACE("acpi_pci_irq_add_entry"); | |
99 | ||
100 | if (!prt) | |
101 | return_VALUE(-EINVAL); | |
102 | ||
103 | entry = kmalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); | |
104 | if (!entry) | |
105 | return_VALUE(-ENOMEM); | |
106 | memset(entry, 0, sizeof(struct acpi_prt_entry)); | |
107 | ||
108 | entry->id.segment = segment; | |
109 | entry->id.bus = bus; | |
110 | entry->id.device = (prt->address >> 16) & 0xFFFF; | |
111 | entry->id.function = prt->address & 0xFFFF; | |
112 | entry->pin = prt->pin; | |
113 | ||
114 | /* | |
115 | * Type 1: Dynamic | |
116 | * --------------- | |
117 | * The 'source' field specifies the PCI interrupt link device used to | |
118 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' | |
119 | * indicates which resource descriptor in the resource template (of | |
120 | * the link device) this interrupt is allocated from. | |
121 | * | |
122 | * NOTE: Don't query the Link Device for IRQ information at this time | |
123 | * because Link Device enumeration may not have occurred yet | |
124 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI | |
125 | * namespace). | |
126 | */ | |
127 | if (prt->source[0]) { | |
128 | acpi_get_handle(handle, prt->source, &entry->link.handle); | |
129 | entry->link.index = prt->source_index; | |
130 | } | |
131 | /* | |
132 | * Type 2: Static | |
133 | * -------------- | |
134 | * The 'source' field is NULL, and the 'source_index' field specifies | |
135 | * the IRQ value, which is hardwired to specific interrupt inputs on | |
136 | * the interrupt controller. | |
137 | */ | |
138 | else | |
139 | entry->link.index = prt->source_index; | |
140 | ||
141 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, | |
142 | " %02X:%02X:%02X[%c] -> %s[%d]\n", | |
143 | entry->id.segment, entry->id.bus, entry->id.device, | |
144 | ('A' + entry->pin), prt->source, entry->link.index)); | |
145 | ||
146 | spin_lock(&acpi_prt_lock); | |
147 | list_add_tail(&entry->node, &acpi_prt.entries); | |
148 | acpi_prt.count++; | |
149 | spin_unlock(&acpi_prt_lock); | |
150 | ||
151 | return_VALUE(0); | |
152 | } | |
153 | ||
154 | ||
155 | static void | |
156 | acpi_pci_irq_del_entry ( | |
157 | int segment, | |
158 | int bus, | |
159 | struct acpi_prt_entry *entry) | |
160 | { | |
161 | if (segment == entry->id.segment && bus == entry->id.bus){ | |
162 | acpi_prt.count--; | |
163 | list_del(&entry->node); | |
164 | kfree(entry); | |
165 | } | |
166 | } | |
167 | ||
168 | ||
169 | int | |
170 | acpi_pci_irq_add_prt ( | |
171 | acpi_handle handle, | |
172 | int segment, | |
173 | int bus) | |
174 | { | |
175 | acpi_status status = AE_OK; | |
176 | char *pathname = NULL; | |
177 | struct acpi_buffer buffer = {0, NULL}; | |
178 | struct acpi_pci_routing_table *prt = NULL; | |
179 | struct acpi_pci_routing_table *entry = NULL; | |
180 | static int first_time = 1; | |
181 | ||
182 | ACPI_FUNCTION_TRACE("acpi_pci_irq_add_prt"); | |
183 | ||
184 | pathname = (char *) kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL); | |
185 | if(!pathname) | |
186 | return_VALUE(-ENOMEM); | |
187 | memset(pathname, 0, ACPI_PATHNAME_MAX); | |
188 | ||
189 | if (first_time) { | |
190 | acpi_prt.count = 0; | |
191 | INIT_LIST_HEAD(&acpi_prt.entries); | |
192 | first_time = 0; | |
193 | } | |
194 | ||
195 | /* | |
196 | * NOTE: We're given a 'handle' to the _PRT object's parent device | |
197 | * (either a PCI root bridge or PCI-PCI bridge). | |
198 | */ | |
199 | ||
200 | buffer.length = ACPI_PATHNAME_MAX; | |
201 | buffer.pointer = pathname; | |
202 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
203 | ||
204 | printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", | |
205 | pathname); | |
206 | ||
207 | /* | |
208 | * Evaluate this _PRT and add its entries to our global list (acpi_prt). | |
209 | */ | |
210 | ||
211 | buffer.length = 0; | |
212 | buffer.pointer = NULL; | |
213 | kfree(pathname); | |
214 | status = acpi_get_irq_routing_table(handle, &buffer); | |
215 | if (status != AE_BUFFER_OVERFLOW) { | |
216 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n", | |
217 | acpi_format_exception(status))); | |
218 | return_VALUE(-ENODEV); | |
219 | } | |
220 | ||
221 | prt = kmalloc(buffer.length, GFP_KERNEL); | |
222 | if (!prt){ | |
223 | return_VALUE(-ENOMEM); | |
224 | } | |
225 | memset(prt, 0, buffer.length); | |
226 | buffer.pointer = prt; | |
227 | ||
228 | status = acpi_get_irq_routing_table(handle, &buffer); | |
229 | if (ACPI_FAILURE(status)) { | |
230 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n", | |
231 | acpi_format_exception(status))); | |
232 | kfree(buffer.pointer); | |
233 | return_VALUE(-ENODEV); | |
234 | } | |
235 | ||
236 | entry = prt; | |
237 | ||
238 | while (entry && (entry->length > 0)) { | |
239 | acpi_pci_irq_add_entry(handle, segment, bus, entry); | |
240 | entry = (struct acpi_pci_routing_table *) | |
241 | ((unsigned long) entry + entry->length); | |
242 | } | |
243 | ||
244 | kfree(prt); | |
245 | ||
246 | return_VALUE(0); | |
247 | } | |
248 | ||
249 | void | |
250 | acpi_pci_irq_del_prt (int segment, int bus) | |
251 | { | |
252 | struct list_head *node = NULL, *n = NULL; | |
253 | struct acpi_prt_entry *entry = NULL; | |
254 | ||
255 | if (!acpi_prt.count) { | |
256 | return; | |
257 | } | |
258 | ||
259 | printk(KERN_DEBUG "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", | |
260 | segment, bus); | |
261 | spin_lock(&acpi_prt_lock); | |
262 | list_for_each_safe(node, n, &acpi_prt.entries) { | |
263 | entry = list_entry(node, struct acpi_prt_entry, node); | |
264 | ||
265 | acpi_pci_irq_del_entry(segment, bus, entry); | |
266 | } | |
267 | spin_unlock(&acpi_prt_lock); | |
268 | } | |
269 | /* -------------------------------------------------------------------------- | |
270 | PCI Interrupt Routing Support | |
271 | -------------------------------------------------------------------------- */ | |
87bec66b | 272 | typedef int (*irq_lookup_func)(struct acpi_prt_entry *, int *, int *, char **); |
1da177e4 | 273 | |
87bec66b DSL |
274 | static int |
275 | acpi_pci_allocate_irq(struct acpi_prt_entry *entry, | |
276 | int *edge_level, | |
277 | int *active_high_low, | |
278 | char **link) | |
279 | { | |
280 | int irq; | |
281 | ||
282 | ACPI_FUNCTION_TRACE("acpi_pci_allocate_irq"); | |
283 | ||
284 | if (entry->link.handle) { | |
285 | irq = acpi_pci_link_allocate_irq(entry->link.handle, | |
286 | entry->link.index, edge_level, active_high_low, link); | |
287 | if (irq < 0) { | |
288 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n")); | |
289 | return_VALUE(-1); | |
290 | } | |
291 | } else { | |
292 | irq = entry->link.index; | |
293 | *edge_level = ACPI_LEVEL_SENSITIVE; | |
294 | *active_high_low = ACPI_ACTIVE_LOW; | |
295 | } | |
296 | ||
297 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq)); | |
298 | return_VALUE(irq); | |
299 | } | |
300 | ||
301 | static int | |
302 | acpi_pci_free_irq(struct acpi_prt_entry *entry, | |
303 | int *edge_level, | |
304 | int *active_high_low, | |
305 | char **link) | |
306 | { | |
307 | int irq; | |
308 | ||
309 | ACPI_FUNCTION_TRACE("acpi_pci_free_irq"); | |
310 | if (entry->link.handle) { | |
311 | irq = acpi_pci_link_free_irq(entry->link.handle); | |
312 | } else { | |
313 | irq = entry->link.index; | |
314 | } | |
315 | return_VALUE(irq); | |
316 | } | |
1da177e4 LT |
317 | /* |
318 | * acpi_pci_irq_lookup | |
319 | * success: return IRQ >= 0 | |
320 | * failure: return -1 | |
321 | */ | |
322 | static int | |
323 | acpi_pci_irq_lookup ( | |
324 | struct pci_bus *bus, | |
325 | int device, | |
326 | int pin, | |
327 | int *edge_level, | |
328 | int *active_high_low, | |
87bec66b DSL |
329 | char **link, |
330 | irq_lookup_func func) | |
1da177e4 LT |
331 | { |
332 | struct acpi_prt_entry *entry = NULL; | |
333 | int segment = pci_domain_nr(bus); | |
334 | int bus_nr = bus->number; | |
87bec66b | 335 | int ret; |
1da177e4 LT |
336 | |
337 | ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup"); | |
338 | ||
339 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
340 | "Searching for PRT entry for %02x:%02x:%02x[%c]\n", | |
341 | segment, bus_nr, device, ('A' + pin))); | |
342 | ||
343 | entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); | |
344 | if (!entry) { | |
345 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n")); | |
346 | return_VALUE(-1); | |
347 | } | |
348 | ||
87bec66b DSL |
349 | ret = func(entry, edge_level, active_high_low, link); |
350 | return_VALUE(ret); | |
1da177e4 LT |
351 | } |
352 | ||
353 | /* | |
354 | * acpi_pci_irq_derive | |
355 | * success: return IRQ >= 0 | |
356 | * failure: return < 0 | |
357 | */ | |
358 | static int | |
359 | acpi_pci_irq_derive ( | |
360 | struct pci_dev *dev, | |
361 | int pin, | |
362 | int *edge_level, | |
363 | int *active_high_low, | |
87bec66b DSL |
364 | char **link, |
365 | irq_lookup_func func) | |
1da177e4 LT |
366 | { |
367 | struct pci_dev *bridge = dev; | |
368 | int irq = -1; | |
369 | u8 bridge_pin = 0; | |
370 | ||
371 | ACPI_FUNCTION_TRACE("acpi_pci_irq_derive"); | |
372 | ||
373 | if (!dev) | |
374 | return_VALUE(-EINVAL); | |
375 | ||
376 | /* | |
377 | * Attempt to derive an IRQ for this device from a parent bridge's | |
378 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
379 | */ | |
380 | while (irq < 0 && bridge->bus->self) { | |
381 | pin = (pin + PCI_SLOT(bridge->devfn)) % 4; | |
382 | bridge = bridge->bus->self; | |
383 | ||
384 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
385 | /* PC card has the same IRQ as its cardbridge */ | |
386 | pci_read_config_byte(bridge, PCI_INTERRUPT_PIN, &bridge_pin); | |
387 | if (!bridge_pin) { | |
388 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
389 | "No interrupt pin configured for device %s\n", pci_name(bridge))); | |
390 | return_VALUE(-1); | |
391 | } | |
392 | /* Pin is from 0 to 3 */ | |
393 | bridge_pin --; | |
394 | pin = bridge_pin; | |
395 | } | |
396 | ||
397 | irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), | |
87bec66b | 398 | pin, edge_level, active_high_low, link, func); |
1da177e4 LT |
399 | } |
400 | ||
401 | if (irq < 0) { | |
402 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to derive IRQ for device %s\n", pci_name(dev))); | |
403 | return_VALUE(-1); | |
404 | } | |
405 | ||
406 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n", | |
407 | irq, pci_name(dev), pci_name(bridge))); | |
408 | ||
409 | return_VALUE(irq); | |
410 | } | |
411 | ||
412 | /* | |
413 | * acpi_pci_irq_enable | |
414 | * success: return 0 | |
415 | * failure: return < 0 | |
416 | */ | |
417 | ||
418 | int | |
419 | acpi_pci_irq_enable ( | |
420 | struct pci_dev *dev) | |
421 | { | |
422 | int irq = 0; | |
423 | u8 pin = 0; | |
424 | int edge_level = ACPI_LEVEL_SENSITIVE; | |
425 | int active_high_low = ACPI_ACTIVE_LOW; | |
1da177e4 LT |
426 | char *link = NULL; |
427 | ||
428 | ACPI_FUNCTION_TRACE("acpi_pci_irq_enable"); | |
429 | ||
430 | if (!dev) | |
431 | return_VALUE(-EINVAL); | |
432 | ||
433 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); | |
434 | if (!pin) { | |
435 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No interrupt pin configured for device %s\n", pci_name(dev))); | |
436 | return_VALUE(0); | |
437 | } | |
438 | pin--; | |
439 | ||
440 | if (!dev->bus) { | |
441 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) 'bus' field\n")); | |
442 | return_VALUE(-ENODEV); | |
443 | } | |
444 | ||
445 | /* | |
446 | * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT | |
447 | * values override any BIOS-assigned IRQs set during boot. | |
448 | */ | |
449 | irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, | |
87bec66b | 450 | &edge_level, &active_high_low, &link, acpi_pci_allocate_irq); |
1da177e4 LT |
451 | |
452 | /* | |
453 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
454 | * device's parent bridge. | |
455 | */ | |
456 | if (irq < 0) | |
457 | irq = acpi_pci_irq_derive(dev, pin, &edge_level, | |
87bec66b | 458 | &active_high_low, &link, acpi_pci_allocate_irq); |
1da177e4 LT |
459 | |
460 | /* | |
461 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
462 | * driver reported one, then use it. Exit in any case. | |
463 | */ | |
464 | if (irq < 0) { | |
465 | printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI", | |
466 | pci_name(dev), ('A' + pin)); | |
467 | /* Interrupt Line values above 0xF are forbidden */ | |
468 | if (dev->irq >= 0 && (dev->irq <= 0xF)) { | |
469 | printk(" - using IRQ %d\n", dev->irq); | |
470 | return_VALUE(0); | |
471 | } | |
472 | else { | |
473 | printk("\n"); | |
474 | return_VALUE(0); | |
475 | } | |
476 | } | |
477 | ||
1da177e4 LT |
478 | dev->irq = acpi_register_gsi(irq, edge_level, active_high_low); |
479 | ||
480 | printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ", | |
481 | pci_name(dev), 'A' + pin); | |
482 | ||
483 | if (link) | |
484 | printk("Link [%s] -> ", link); | |
485 | ||
486 | printk("GSI %u (%s, %s) -> IRQ %d\n", irq, | |
487 | (edge_level == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", | |
488 | (active_high_low == ACPI_ACTIVE_LOW) ? "low" : "high", | |
489 | dev->irq); | |
490 | ||
491 | return_VALUE(0); | |
492 | } | |
493 | EXPORT_SYMBOL(acpi_pci_irq_enable); | |
494 | ||
495 | ||
87bec66b DSL |
496 | /* FIXME: implement x86/x86_64 version */ |
497 | void __attribute__((weak)) acpi_unregister_gsi(u32 i) {} | |
498 | ||
1da177e4 LT |
499 | void |
500 | acpi_pci_irq_disable ( | |
501 | struct pci_dev *dev) | |
502 | { | |
503 | int gsi = 0; | |
504 | u8 pin = 0; | |
505 | int edge_level = ACPI_LEVEL_SENSITIVE; | |
506 | int active_high_low = ACPI_ACTIVE_LOW; | |
507 | ||
508 | ACPI_FUNCTION_TRACE("acpi_pci_irq_disable"); | |
509 | ||
510 | if (!dev) | |
511 | return_VOID; | |
512 | ||
513 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); | |
514 | if (!pin) | |
515 | return_VOID; | |
516 | pin--; | |
517 | ||
518 | if (!dev->bus) | |
519 | return_VOID; | |
520 | ||
521 | /* | |
522 | * First we check the PCI IRQ routing table (PRT) for an IRQ. | |
523 | */ | |
524 | gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, | |
87bec66b | 525 | &edge_level, &active_high_low, NULL, acpi_pci_free_irq); |
1da177e4 LT |
526 | /* |
527 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
528 | * device's parent bridge. | |
529 | */ | |
530 | if (gsi < 0) | |
531 | gsi = acpi_pci_irq_derive(dev, pin, | |
87bec66b | 532 | &edge_level, &active_high_low, NULL, acpi_pci_free_irq); |
1da177e4 LT |
533 | if (gsi < 0) |
534 | return_VOID; | |
535 | ||
536 | /* | |
537 | * TBD: It might be worth clearing dev->irq by magic constant | |
538 | * (e.g. PCI_UNDEFINED_IRQ). | |
539 | */ | |
540 | ||
541 | printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n", | |
542 | pci_name(dev)); | |
543 | ||
544 | acpi_unregister_gsi(gsi); | |
545 | ||
546 | return_VOID; | |
547 | } |