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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 | ||
1da177e4 LT |
27 | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/proc_fs.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/pm.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/acpi.h> | |
37 | #include <acpi/acpi_bus.h> | |
38 | #include <acpi/acpi_drivers.h> | |
39 | ||
1da177e4 | 40 | #define _COMPONENT ACPI_PCI_COMPONENT |
4be44fcd | 41 | ACPI_MODULE_NAME("pci_irq") |
1da177e4 | 42 | |
4be44fcd | 43 | static struct acpi_prt_list acpi_prt; |
1da177e4 LT |
44 | static DEFINE_SPINLOCK(acpi_prt_lock); |
45 | ||
46 | /* -------------------------------------------------------------------------- | |
47 | PCI IRQ Routing Table (PRT) Support | |
48 | -------------------------------------------------------------------------- */ | |
49 | ||
4be44fcd LB |
50 | static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment, |
51 | int bus, | |
52 | int device, int pin) | |
1da177e4 | 53 | { |
4be44fcd LB |
54 | struct list_head *node = NULL; |
55 | struct acpi_prt_entry *entry = NULL; | |
1da177e4 | 56 | |
1da177e4 LT |
57 | |
58 | if (!acpi_prt.count) | |
d550d98d | 59 | return NULL; |
1da177e4 LT |
60 | |
61 | /* | |
62 | * Parse through all PRT entries looking for a match on the specified | |
63 | * PCI device's segment, bus, device, and pin (don't care about func). | |
64 | * | |
65 | */ | |
66 | spin_lock(&acpi_prt_lock); | |
67 | list_for_each(node, &acpi_prt.entries) { | |
68 | entry = list_entry(node, struct acpi_prt_entry, node); | |
4be44fcd LB |
69 | if ((segment == entry->id.segment) |
70 | && (bus == entry->id.bus) | |
71 | && (device == entry->id.device) | |
72 | && (pin == entry->pin)) { | |
1da177e4 | 73 | spin_unlock(&acpi_prt_lock); |
d550d98d | 74 | return entry; |
1da177e4 LT |
75 | } |
76 | } | |
77 | ||
78 | spin_unlock(&acpi_prt_lock); | |
d550d98d | 79 | return NULL; |
1da177e4 LT |
80 | } |
81 | ||
1da177e4 | 82 | static int |
4be44fcd LB |
83 | acpi_pci_irq_add_entry(acpi_handle handle, |
84 | int segment, int bus, struct acpi_pci_routing_table *prt) | |
1da177e4 | 85 | { |
4be44fcd | 86 | struct acpi_prt_entry *entry = NULL; |
1da177e4 | 87 | |
1da177e4 LT |
88 | |
89 | if (!prt) | |
d550d98d | 90 | return -EINVAL; |
1da177e4 LT |
91 | |
92 | entry = kmalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); | |
93 | if (!entry) | |
d550d98d | 94 | return -ENOMEM; |
1da177e4 LT |
95 | memset(entry, 0, sizeof(struct acpi_prt_entry)); |
96 | ||
97 | entry->id.segment = segment; | |
98 | entry->id.bus = bus; | |
99 | entry->id.device = (prt->address >> 16) & 0xFFFF; | |
100 | entry->id.function = prt->address & 0xFFFF; | |
101 | entry->pin = prt->pin; | |
102 | ||
103 | /* | |
104 | * Type 1: Dynamic | |
105 | * --------------- | |
106 | * The 'source' field specifies the PCI interrupt link device used to | |
107 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' | |
108 | * indicates which resource descriptor in the resource template (of | |
109 | * the link device) this interrupt is allocated from. | |
110 | * | |
111 | * NOTE: Don't query the Link Device for IRQ information at this time | |
112 | * because Link Device enumeration may not have occurred yet | |
113 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI | |
114 | * namespace). | |
115 | */ | |
116 | if (prt->source[0]) { | |
117 | acpi_get_handle(handle, prt->source, &entry->link.handle); | |
118 | entry->link.index = prt->source_index; | |
119 | } | |
120 | /* | |
121 | * Type 2: Static | |
122 | * -------------- | |
123 | * The 'source' field is NULL, and the 'source_index' field specifies | |
124 | * the IRQ value, which is hardwired to specific interrupt inputs on | |
125 | * the interrupt controller. | |
126 | */ | |
127 | else | |
128 | entry->link.index = prt->source_index; | |
129 | ||
130 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, | |
4be44fcd LB |
131 | " %02X:%02X:%02X[%c] -> %s[%d]\n", |
132 | entry->id.segment, entry->id.bus, | |
133 | entry->id.device, ('A' + entry->pin), prt->source, | |
134 | entry->link.index)); | |
1da177e4 LT |
135 | |
136 | spin_lock(&acpi_prt_lock); | |
137 | list_add_tail(&entry->node, &acpi_prt.entries); | |
138 | acpi_prt.count++; | |
139 | spin_unlock(&acpi_prt_lock); | |
140 | ||
d550d98d | 141 | return 0; |
1da177e4 LT |
142 | } |
143 | ||
1da177e4 | 144 | static void |
4be44fcd | 145 | acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry) |
1da177e4 | 146 | { |
4be44fcd | 147 | if (segment == entry->id.segment && bus == entry->id.bus) { |
1da177e4 LT |
148 | acpi_prt.count--; |
149 | list_del(&entry->node); | |
150 | kfree(entry); | |
151 | } | |
152 | } | |
153 | ||
4be44fcd | 154 | int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus) |
1da177e4 | 155 | { |
4be44fcd LB |
156 | acpi_status status = AE_OK; |
157 | char *pathname = NULL; | |
158 | struct acpi_buffer buffer = { 0, NULL }; | |
159 | struct acpi_pci_routing_table *prt = NULL; | |
160 | struct acpi_pci_routing_table *entry = NULL; | |
161 | static int first_time = 1; | |
1da177e4 | 162 | |
1da177e4 | 163 | |
50dd0969 | 164 | pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL); |
4be44fcd | 165 | if (!pathname) |
d550d98d | 166 | return -ENOMEM; |
1da177e4 LT |
167 | memset(pathname, 0, ACPI_PATHNAME_MAX); |
168 | ||
169 | if (first_time) { | |
170 | acpi_prt.count = 0; | |
171 | INIT_LIST_HEAD(&acpi_prt.entries); | |
172 | first_time = 0; | |
173 | } | |
174 | ||
175 | /* | |
176 | * NOTE: We're given a 'handle' to the _PRT object's parent device | |
177 | * (either a PCI root bridge or PCI-PCI bridge). | |
178 | */ | |
179 | ||
180 | buffer.length = ACPI_PATHNAME_MAX; | |
181 | buffer.pointer = pathname; | |
182 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
183 | ||
184 | printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", | |
4be44fcd | 185 | pathname); |
1da177e4 LT |
186 | |
187 | /* | |
188 | * Evaluate this _PRT and add its entries to our global list (acpi_prt). | |
189 | */ | |
190 | ||
191 | buffer.length = 0; | |
192 | buffer.pointer = NULL; | |
193 | kfree(pathname); | |
194 | status = acpi_get_irq_routing_table(handle, &buffer); | |
195 | if (status != AE_BUFFER_OVERFLOW) { | |
a6fc6720 TR |
196 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", |
197 | acpi_format_exception(status))); | |
d550d98d | 198 | return -ENODEV; |
1da177e4 LT |
199 | } |
200 | ||
201 | prt = kmalloc(buffer.length, GFP_KERNEL); | |
4be44fcd | 202 | if (!prt) { |
d550d98d | 203 | return -ENOMEM; |
1da177e4 LT |
204 | } |
205 | memset(prt, 0, buffer.length); | |
206 | buffer.pointer = prt; | |
207 | ||
208 | status = acpi_get_irq_routing_table(handle, &buffer); | |
209 | if (ACPI_FAILURE(status)) { | |
a6fc6720 TR |
210 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", |
211 | acpi_format_exception(status))); | |
1da177e4 | 212 | kfree(buffer.pointer); |
d550d98d | 213 | return -ENODEV; |
1da177e4 LT |
214 | } |
215 | ||
216 | entry = prt; | |
217 | ||
218 | while (entry && (entry->length > 0)) { | |
219 | acpi_pci_irq_add_entry(handle, segment, bus, entry); | |
220 | entry = (struct acpi_pci_routing_table *) | |
4be44fcd | 221 | ((unsigned long)entry + entry->length); |
1da177e4 LT |
222 | } |
223 | ||
224 | kfree(prt); | |
225 | ||
d550d98d | 226 | return 0; |
1da177e4 LT |
227 | } |
228 | ||
4be44fcd | 229 | void acpi_pci_irq_del_prt(int segment, int bus) |
1da177e4 | 230 | { |
4be44fcd LB |
231 | struct list_head *node = NULL, *n = NULL; |
232 | struct acpi_prt_entry *entry = NULL; | |
1da177e4 | 233 | |
4be44fcd | 234 | if (!acpi_prt.count) { |
1da177e4 LT |
235 | return; |
236 | } | |
237 | ||
4be44fcd LB |
238 | printk(KERN_DEBUG |
239 | "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment, | |
240 | bus); | |
1da177e4 LT |
241 | spin_lock(&acpi_prt_lock); |
242 | list_for_each_safe(node, n, &acpi_prt.entries) { | |
243 | entry = list_entry(node, struct acpi_prt_entry, node); | |
244 | ||
245 | acpi_pci_irq_del_entry(segment, bus, entry); | |
246 | } | |
247 | spin_unlock(&acpi_prt_lock); | |
248 | } | |
4be44fcd | 249 | |
1da177e4 LT |
250 | /* -------------------------------------------------------------------------- |
251 | PCI Interrupt Routing Support | |
252 | -------------------------------------------------------------------------- */ | |
4be44fcd | 253 | typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **); |
1da177e4 | 254 | |
87bec66b DSL |
255 | static int |
256 | acpi_pci_allocate_irq(struct acpi_prt_entry *entry, | |
50eca3eb | 257 | int *triggering, int *polarity, char **link) |
87bec66b | 258 | { |
4be44fcd | 259 | int irq; |
87bec66b | 260 | |
87bec66b DSL |
261 | |
262 | if (entry->link.handle) { | |
263 | irq = acpi_pci_link_allocate_irq(entry->link.handle, | |
50eca3eb BM |
264 | entry->link.index, triggering, |
265 | polarity, link); | |
87bec66b | 266 | if (irq < 0) { |
cece9296 LB |
267 | printk(KERN_WARNING PREFIX |
268 | "Invalid IRQ link routing entry\n"); | |
d550d98d | 269 | return -1; |
87bec66b DSL |
270 | } |
271 | } else { | |
272 | irq = entry->link.index; | |
50eca3eb BM |
273 | *triggering = ACPI_LEVEL_SENSITIVE; |
274 | *polarity = ACPI_ACTIVE_LOW; | |
87bec66b DSL |
275 | } |
276 | ||
277 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq)); | |
d550d98d | 278 | return irq; |
87bec66b DSL |
279 | } |
280 | ||
281 | static int | |
282 | acpi_pci_free_irq(struct acpi_prt_entry *entry, | |
50eca3eb | 283 | int *triggering, int *polarity, char **link) |
87bec66b | 284 | { |
4be44fcd | 285 | int irq; |
87bec66b | 286 | |
87bec66b DSL |
287 | if (entry->link.handle) { |
288 | irq = acpi_pci_link_free_irq(entry->link.handle); | |
289 | } else { | |
290 | irq = entry->link.index; | |
291 | } | |
d550d98d | 292 | return irq; |
87bec66b | 293 | } |
4be44fcd | 294 | |
1da177e4 LT |
295 | /* |
296 | * acpi_pci_irq_lookup | |
297 | * success: return IRQ >= 0 | |
298 | * failure: return -1 | |
299 | */ | |
300 | static int | |
4be44fcd LB |
301 | acpi_pci_irq_lookup(struct pci_bus *bus, |
302 | int device, | |
303 | int pin, | |
50eca3eb BM |
304 | int *triggering, |
305 | int *polarity, char **link, irq_lookup_func func) | |
1da177e4 | 306 | { |
4be44fcd | 307 | struct acpi_prt_entry *entry = NULL; |
1da177e4 LT |
308 | int segment = pci_domain_nr(bus); |
309 | int bus_nr = bus->number; | |
87bec66b | 310 | int ret; |
1da177e4 | 311 | |
1da177e4 | 312 | |
4be44fcd LB |
313 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
314 | "Searching for PRT entry for %02x:%02x:%02x[%c]\n", | |
315 | segment, bus_nr, device, ('A' + pin))); | |
1da177e4 | 316 | |
4be44fcd | 317 | entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); |
1da177e4 LT |
318 | if (!entry) { |
319 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n")); | |
d550d98d | 320 | return -1; |
1da177e4 | 321 | } |
4be44fcd | 322 | |
50eca3eb | 323 | ret = func(entry, triggering, polarity, link); |
d550d98d | 324 | return ret; |
1da177e4 LT |
325 | } |
326 | ||
327 | /* | |
328 | * acpi_pci_irq_derive | |
329 | * success: return IRQ >= 0 | |
330 | * failure: return < 0 | |
331 | */ | |
332 | static int | |
4be44fcd LB |
333 | acpi_pci_irq_derive(struct pci_dev *dev, |
334 | int pin, | |
50eca3eb BM |
335 | int *triggering, |
336 | int *polarity, char **link, irq_lookup_func func) | |
1da177e4 | 337 | { |
4be44fcd LB |
338 | struct pci_dev *bridge = dev; |
339 | int irq = -1; | |
340 | u8 bridge_pin = 0; | |
1da177e4 | 341 | |
1da177e4 LT |
342 | |
343 | if (!dev) | |
d550d98d | 344 | return -EINVAL; |
1da177e4 LT |
345 | |
346 | /* | |
347 | * Attempt to derive an IRQ for this device from a parent bridge's | |
348 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
349 | */ | |
350 | while (irq < 0 && bridge->bus->self) { | |
351 | pin = (pin + PCI_SLOT(bridge->devfn)) % 4; | |
352 | bridge = bridge->bus->self; | |
353 | ||
354 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
355 | /* PC card has the same IRQ as its cardbridge */ | |
8015a014 | 356 | bridge_pin = bridge->pin; |
1da177e4 | 357 | if (!bridge_pin) { |
4be44fcd LB |
358 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
359 | "No interrupt pin configured for device %s\n", | |
360 | pci_name(bridge))); | |
d550d98d | 361 | return -1; |
1da177e4 LT |
362 | } |
363 | /* Pin is from 0 to 3 */ | |
4be44fcd | 364 | bridge_pin--; |
1da177e4 LT |
365 | pin = bridge_pin; |
366 | } | |
367 | ||
368 | irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), | |
50eca3eb | 369 | pin, triggering, polarity, |
4be44fcd | 370 | link, func); |
1da177e4 LT |
371 | } |
372 | ||
373 | if (irq < 0) { | |
cece9296 LB |
374 | printk(KERN_WARNING PREFIX "Unable to derive IRQ for device %s\n", |
375 | pci_name(dev)); | |
d550d98d | 376 | return -1; |
1da177e4 LT |
377 | } |
378 | ||
379 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n", | |
4be44fcd | 380 | irq, pci_name(dev), pci_name(bridge))); |
1da177e4 | 381 | |
d550d98d | 382 | return irq; |
1da177e4 LT |
383 | } |
384 | ||
385 | /* | |
386 | * acpi_pci_irq_enable | |
387 | * success: return 0 | |
388 | * failure: return < 0 | |
389 | */ | |
390 | ||
4be44fcd | 391 | int acpi_pci_irq_enable(struct pci_dev *dev) |
1da177e4 | 392 | { |
4be44fcd LB |
393 | int irq = 0; |
394 | u8 pin = 0; | |
50eca3eb BM |
395 | int triggering = ACPI_LEVEL_SENSITIVE; |
396 | int polarity = ACPI_ACTIVE_LOW; | |
4be44fcd LB |
397 | char *link = NULL; |
398 | int rc; | |
1da177e4 | 399 | |
1da177e4 LT |
400 | |
401 | if (!dev) | |
d550d98d | 402 | return -EINVAL; |
4be44fcd | 403 | |
8015a014 | 404 | pin = dev->pin; |
1da177e4 | 405 | if (!pin) { |
4be44fcd LB |
406 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
407 | "No interrupt pin configured for device %s\n", | |
408 | pci_name(dev))); | |
d550d98d | 409 | return 0; |
1da177e4 LT |
410 | } |
411 | pin--; | |
412 | ||
413 | if (!dev->bus) { | |
6468463a | 414 | printk(KERN_ERR PREFIX "Invalid (NULL) 'bus' field\n"); |
d550d98d | 415 | return -ENODEV; |
1da177e4 LT |
416 | } |
417 | ||
418 | /* | |
419 | * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT | |
420 | * values override any BIOS-assigned IRQs set during boot. | |
421 | */ | |
4be44fcd | 422 | irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
50eca3eb | 423 | &triggering, &polarity, &link, |
4be44fcd | 424 | acpi_pci_allocate_irq); |
1da177e4 LT |
425 | |
426 | /* | |
427 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
428 | * device's parent bridge. | |
429 | */ | |
430 | if (irq < 0) | |
50eca3eb BM |
431 | irq = acpi_pci_irq_derive(dev, pin, &triggering, |
432 | &polarity, &link, | |
4be44fcd LB |
433 | acpi_pci_allocate_irq); |
434 | ||
1da177e4 LT |
435 | /* |
436 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
437 | * driver reported one, then use it. Exit in any case. | |
438 | */ | |
439 | if (irq < 0) { | |
440 | printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI", | |
4be44fcd | 441 | pci_name(dev), ('A' + pin)); |
1da177e4 | 442 | /* Interrupt Line values above 0xF are forbidden */ |
44f8e1a2 | 443 | if (dev->irq > 0 && (dev->irq <= 0xF)) { |
1da177e4 | 444 | printk(" - using IRQ %d\n", dev->irq); |
4be44fcd LB |
445 | acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, |
446 | ACPI_ACTIVE_LOW); | |
d550d98d | 447 | return 0; |
4be44fcd | 448 | } else { |
1da177e4 | 449 | printk("\n"); |
d550d98d | 450 | return 0; |
1da177e4 | 451 | } |
4be44fcd | 452 | } |
1da177e4 | 453 | |
50eca3eb | 454 | rc = acpi_register_gsi(irq, triggering, polarity); |
349f0d56 KK |
455 | if (rc < 0) { |
456 | printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: failed " | |
457 | "to register GSI\n", pci_name(dev), ('A' + pin)); | |
d550d98d | 458 | return rc; |
349f0d56 KK |
459 | } |
460 | dev->irq = rc; | |
1da177e4 LT |
461 | |
462 | printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ", | |
4be44fcd | 463 | pci_name(dev), 'A' + pin); |
1da177e4 LT |
464 | |
465 | if (link) | |
466 | printk("Link [%s] -> ", link); | |
467 | ||
468 | printk("GSI %u (%s, %s) -> IRQ %d\n", irq, | |
50eca3eb BM |
469 | (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", |
470 | (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); | |
1da177e4 | 471 | |
d550d98d | 472 | return 0; |
1da177e4 | 473 | } |
1da177e4 | 474 | |
4be44fcd | 475 | EXPORT_SYMBOL(acpi_pci_irq_enable); |
1da177e4 | 476 | |
87bec66b | 477 | /* FIXME: implement x86/x86_64 version */ |
4be44fcd LB |
478 | void __attribute__ ((weak)) acpi_unregister_gsi(u32 i) |
479 | { | |
480 | } | |
87bec66b | 481 | |
4be44fcd | 482 | void acpi_pci_irq_disable(struct pci_dev *dev) |
1da177e4 | 483 | { |
4be44fcd LB |
484 | int gsi = 0; |
485 | u8 pin = 0; | |
50eca3eb BM |
486 | int triggering = ACPI_LEVEL_SENSITIVE; |
487 | int polarity = ACPI_ACTIVE_LOW; | |
1da177e4 | 488 | |
1da177e4 | 489 | |
5f0110f2 | 490 | if (!dev || !dev->bus) |
d550d98d | 491 | return; |
1da177e4 | 492 | |
8015a014 | 493 | pin = dev->pin; |
1da177e4 | 494 | if (!pin) |
d550d98d | 495 | return; |
1da177e4 LT |
496 | pin--; |
497 | ||
1da177e4 LT |
498 | /* |
499 | * First we check the PCI IRQ routing table (PRT) for an IRQ. | |
500 | */ | |
4be44fcd | 501 | gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
50eca3eb | 502 | &triggering, &polarity, NULL, |
4be44fcd | 503 | acpi_pci_free_irq); |
1da177e4 LT |
504 | /* |
505 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
506 | * device's parent bridge. | |
507 | */ | |
508 | if (gsi < 0) | |
4be44fcd | 509 | gsi = acpi_pci_irq_derive(dev, pin, |
50eca3eb | 510 | &triggering, &polarity, NULL, |
4be44fcd | 511 | acpi_pci_free_irq); |
1da177e4 | 512 | if (gsi < 0) |
d550d98d | 513 | return; |
1da177e4 LT |
514 | |
515 | /* | |
516 | * TBD: It might be worth clearing dev->irq by magic constant | |
517 | * (e.g. PCI_UNDEFINED_IRQ). | |
518 | */ | |
519 | ||
520 | printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n", | |
521 | pci_name(dev)); | |
522 | ||
523 | acpi_unregister_gsi(gsi); | |
524 | ||
d550d98d | 525 | return; |
1da177e4 | 526 | } |