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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 | ||
1da177e4 | 41 | #define _COMPONENT ACPI_PCI_COMPONENT |
4be44fcd | 42 | ACPI_MODULE_NAME("pci_irq") |
1da177e4 | 43 | |
4be44fcd | 44 | static struct acpi_prt_list acpi_prt; |
1da177e4 LT |
45 | static DEFINE_SPINLOCK(acpi_prt_lock); |
46 | ||
47 | /* -------------------------------------------------------------------------- | |
48 | PCI IRQ Routing Table (PRT) Support | |
49 | -------------------------------------------------------------------------- */ | |
50 | ||
4be44fcd LB |
51 | static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment, |
52 | int bus, | |
53 | int device, int pin) | |
1da177e4 | 54 | { |
4be44fcd LB |
55 | struct list_head *node = NULL; |
56 | struct acpi_prt_entry *entry = NULL; | |
1da177e4 LT |
57 | |
58 | ACPI_FUNCTION_TRACE("acpi_pci_irq_find_prt_entry"); | |
59 | ||
60 | if (!acpi_prt.count) | |
61 | return_PTR(NULL); | |
62 | ||
63 | /* | |
64 | * Parse through all PRT entries looking for a match on the specified | |
65 | * PCI device's segment, bus, device, and pin (don't care about func). | |
66 | * | |
67 | */ | |
68 | spin_lock(&acpi_prt_lock); | |
69 | list_for_each(node, &acpi_prt.entries) { | |
70 | entry = list_entry(node, struct acpi_prt_entry, node); | |
4be44fcd LB |
71 | if ((segment == entry->id.segment) |
72 | && (bus == entry->id.bus) | |
73 | && (device == entry->id.device) | |
74 | && (pin == entry->pin)) { | |
1da177e4 LT |
75 | spin_unlock(&acpi_prt_lock); |
76 | return_PTR(entry); | |
77 | } | |
78 | } | |
79 | ||
80 | spin_unlock(&acpi_prt_lock); | |
81 | return_PTR(NULL); | |
82 | } | |
83 | ||
1da177e4 | 84 | static int |
4be44fcd LB |
85 | acpi_pci_irq_add_entry(acpi_handle handle, |
86 | int segment, int bus, struct acpi_pci_routing_table *prt) | |
1da177e4 | 87 | { |
4be44fcd | 88 | struct acpi_prt_entry *entry = NULL; |
1da177e4 LT |
89 | |
90 | ACPI_FUNCTION_TRACE("acpi_pci_irq_add_entry"); | |
91 | ||
92 | if (!prt) | |
93 | return_VALUE(-EINVAL); | |
94 | ||
95 | entry = kmalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); | |
96 | if (!entry) | |
97 | return_VALUE(-ENOMEM); | |
98 | memset(entry, 0, sizeof(struct acpi_prt_entry)); | |
99 | ||
100 | entry->id.segment = segment; | |
101 | entry->id.bus = bus; | |
102 | entry->id.device = (prt->address >> 16) & 0xFFFF; | |
103 | entry->id.function = prt->address & 0xFFFF; | |
104 | entry->pin = prt->pin; | |
105 | ||
106 | /* | |
107 | * Type 1: Dynamic | |
108 | * --------------- | |
109 | * The 'source' field specifies the PCI interrupt link device used to | |
110 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' | |
111 | * indicates which resource descriptor in the resource template (of | |
112 | * the link device) this interrupt is allocated from. | |
113 | * | |
114 | * NOTE: Don't query the Link Device for IRQ information at this time | |
115 | * because Link Device enumeration may not have occurred yet | |
116 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI | |
117 | * namespace). | |
118 | */ | |
119 | if (prt->source[0]) { | |
120 | acpi_get_handle(handle, prt->source, &entry->link.handle); | |
121 | entry->link.index = prt->source_index; | |
122 | } | |
123 | /* | |
124 | * Type 2: Static | |
125 | * -------------- | |
126 | * The 'source' field is NULL, and the 'source_index' field specifies | |
127 | * the IRQ value, which is hardwired to specific interrupt inputs on | |
128 | * the interrupt controller. | |
129 | */ | |
130 | else | |
131 | entry->link.index = prt->source_index; | |
132 | ||
133 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, | |
4be44fcd LB |
134 | " %02X:%02X:%02X[%c] -> %s[%d]\n", |
135 | entry->id.segment, entry->id.bus, | |
136 | entry->id.device, ('A' + entry->pin), prt->source, | |
137 | entry->link.index)); | |
1da177e4 LT |
138 | |
139 | spin_lock(&acpi_prt_lock); | |
140 | list_add_tail(&entry->node, &acpi_prt.entries); | |
141 | acpi_prt.count++; | |
142 | spin_unlock(&acpi_prt_lock); | |
143 | ||
144 | return_VALUE(0); | |
145 | } | |
146 | ||
1da177e4 | 147 | static void |
4be44fcd | 148 | acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry) |
1da177e4 | 149 | { |
4be44fcd | 150 | if (segment == entry->id.segment && bus == entry->id.bus) { |
1da177e4 LT |
151 | acpi_prt.count--; |
152 | list_del(&entry->node); | |
153 | kfree(entry); | |
154 | } | |
155 | } | |
156 | ||
4be44fcd | 157 | int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus) |
1da177e4 | 158 | { |
4be44fcd LB |
159 | acpi_status status = AE_OK; |
160 | char *pathname = NULL; | |
161 | struct acpi_buffer buffer = { 0, NULL }; | |
162 | struct acpi_pci_routing_table *prt = NULL; | |
163 | struct acpi_pci_routing_table *entry = NULL; | |
164 | static int first_time = 1; | |
1da177e4 LT |
165 | |
166 | ACPI_FUNCTION_TRACE("acpi_pci_irq_add_prt"); | |
167 | ||
4be44fcd LB |
168 | pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL); |
169 | if (!pathname) | |
1da177e4 LT |
170 | return_VALUE(-ENOMEM); |
171 | memset(pathname, 0, ACPI_PATHNAME_MAX); | |
172 | ||
173 | if (first_time) { | |
174 | acpi_prt.count = 0; | |
175 | INIT_LIST_HEAD(&acpi_prt.entries); | |
176 | first_time = 0; | |
177 | } | |
178 | ||
179 | /* | |
180 | * NOTE: We're given a 'handle' to the _PRT object's parent device | |
181 | * (either a PCI root bridge or PCI-PCI bridge). | |
182 | */ | |
183 | ||
184 | buffer.length = ACPI_PATHNAME_MAX; | |
185 | buffer.pointer = pathname; | |
186 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
187 | ||
188 | printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", | |
4be44fcd | 189 | pathname); |
1da177e4 LT |
190 | |
191 | /* | |
192 | * Evaluate this _PRT and add its entries to our global list (acpi_prt). | |
193 | */ | |
194 | ||
195 | buffer.length = 0; | |
196 | buffer.pointer = NULL; | |
197 | kfree(pathname); | |
198 | status = acpi_get_irq_routing_table(handle, &buffer); | |
199 | if (status != AE_BUFFER_OVERFLOW) { | |
200 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n", | |
4be44fcd | 201 | acpi_format_exception(status))); |
1da177e4 LT |
202 | return_VALUE(-ENODEV); |
203 | } | |
204 | ||
205 | prt = kmalloc(buffer.length, GFP_KERNEL); | |
4be44fcd | 206 | if (!prt) { |
1da177e4 LT |
207 | return_VALUE(-ENOMEM); |
208 | } | |
209 | memset(prt, 0, buffer.length); | |
210 | buffer.pointer = prt; | |
211 | ||
212 | status = acpi_get_irq_routing_table(handle, &buffer); | |
213 | if (ACPI_FAILURE(status)) { | |
214 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n", | |
4be44fcd | 215 | acpi_format_exception(status))); |
1da177e4 LT |
216 | kfree(buffer.pointer); |
217 | return_VALUE(-ENODEV); | |
218 | } | |
219 | ||
220 | entry = prt; | |
221 | ||
222 | while (entry && (entry->length > 0)) { | |
223 | acpi_pci_irq_add_entry(handle, segment, bus, entry); | |
224 | entry = (struct acpi_pci_routing_table *) | |
4be44fcd | 225 | ((unsigned long)entry + entry->length); |
1da177e4 LT |
226 | } |
227 | ||
228 | kfree(prt); | |
229 | ||
230 | return_VALUE(0); | |
231 | } | |
232 | ||
4be44fcd | 233 | void acpi_pci_irq_del_prt(int segment, int bus) |
1da177e4 | 234 | { |
4be44fcd LB |
235 | struct list_head *node = NULL, *n = NULL; |
236 | struct acpi_prt_entry *entry = NULL; | |
1da177e4 | 237 | |
4be44fcd | 238 | if (!acpi_prt.count) { |
1da177e4 LT |
239 | return; |
240 | } | |
241 | ||
4be44fcd LB |
242 | printk(KERN_DEBUG |
243 | "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment, | |
244 | bus); | |
1da177e4 LT |
245 | spin_lock(&acpi_prt_lock); |
246 | list_for_each_safe(node, n, &acpi_prt.entries) { | |
247 | entry = list_entry(node, struct acpi_prt_entry, node); | |
248 | ||
249 | acpi_pci_irq_del_entry(segment, bus, entry); | |
250 | } | |
251 | spin_unlock(&acpi_prt_lock); | |
252 | } | |
4be44fcd | 253 | |
1da177e4 LT |
254 | /* -------------------------------------------------------------------------- |
255 | PCI Interrupt Routing Support | |
256 | -------------------------------------------------------------------------- */ | |
4be44fcd | 257 | typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **); |
1da177e4 | 258 | |
87bec66b DSL |
259 | static int |
260 | acpi_pci_allocate_irq(struct acpi_prt_entry *entry, | |
4be44fcd | 261 | int *edge_level, int *active_high_low, char **link) |
87bec66b | 262 | { |
4be44fcd | 263 | int irq; |
87bec66b DSL |
264 | |
265 | ACPI_FUNCTION_TRACE("acpi_pci_allocate_irq"); | |
266 | ||
267 | if (entry->link.handle) { | |
268 | irq = acpi_pci_link_allocate_irq(entry->link.handle, | |
4be44fcd LB |
269 | entry->link.index, edge_level, |
270 | active_high_low, link); | |
87bec66b | 271 | if (irq < 0) { |
4be44fcd LB |
272 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
273 | "Invalid IRQ link routing entry\n")); | |
87bec66b DSL |
274 | return_VALUE(-1); |
275 | } | |
276 | } else { | |
277 | irq = entry->link.index; | |
278 | *edge_level = ACPI_LEVEL_SENSITIVE; | |
279 | *active_high_low = ACPI_ACTIVE_LOW; | |
280 | } | |
281 | ||
282 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq)); | |
283 | return_VALUE(irq); | |
284 | } | |
285 | ||
286 | static int | |
287 | acpi_pci_free_irq(struct acpi_prt_entry *entry, | |
4be44fcd | 288 | int *edge_level, int *active_high_low, char **link) |
87bec66b | 289 | { |
4be44fcd | 290 | int irq; |
87bec66b DSL |
291 | |
292 | ACPI_FUNCTION_TRACE("acpi_pci_free_irq"); | |
293 | if (entry->link.handle) { | |
294 | irq = acpi_pci_link_free_irq(entry->link.handle); | |
295 | } else { | |
296 | irq = entry->link.index; | |
297 | } | |
298 | return_VALUE(irq); | |
299 | } | |
4be44fcd | 300 | |
1da177e4 LT |
301 | /* |
302 | * acpi_pci_irq_lookup | |
303 | * success: return IRQ >= 0 | |
304 | * failure: return -1 | |
305 | */ | |
306 | static int | |
4be44fcd LB |
307 | acpi_pci_irq_lookup(struct pci_bus *bus, |
308 | int device, | |
309 | int pin, | |
310 | int *edge_level, | |
311 | int *active_high_low, char **link, irq_lookup_func func) | |
1da177e4 | 312 | { |
4be44fcd | 313 | struct acpi_prt_entry *entry = NULL; |
1da177e4 LT |
314 | int segment = pci_domain_nr(bus); |
315 | int bus_nr = bus->number; | |
87bec66b | 316 | int ret; |
1da177e4 LT |
317 | |
318 | ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup"); | |
319 | ||
4be44fcd LB |
320 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
321 | "Searching for PRT entry for %02x:%02x:%02x[%c]\n", | |
322 | segment, bus_nr, device, ('A' + pin))); | |
1da177e4 | 323 | |
4be44fcd | 324 | entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); |
1da177e4 LT |
325 | if (!entry) { |
326 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n")); | |
327 | return_VALUE(-1); | |
328 | } | |
4be44fcd | 329 | |
87bec66b DSL |
330 | ret = func(entry, edge_level, active_high_low, link); |
331 | return_VALUE(ret); | |
1da177e4 LT |
332 | } |
333 | ||
334 | /* | |
335 | * acpi_pci_irq_derive | |
336 | * success: return IRQ >= 0 | |
337 | * failure: return < 0 | |
338 | */ | |
339 | static int | |
4be44fcd LB |
340 | acpi_pci_irq_derive(struct pci_dev *dev, |
341 | int pin, | |
342 | int *edge_level, | |
343 | int *active_high_low, char **link, irq_lookup_func func) | |
1da177e4 | 344 | { |
4be44fcd LB |
345 | struct pci_dev *bridge = dev; |
346 | int irq = -1; | |
347 | u8 bridge_pin = 0; | |
1da177e4 LT |
348 | |
349 | ACPI_FUNCTION_TRACE("acpi_pci_irq_derive"); | |
350 | ||
351 | if (!dev) | |
352 | return_VALUE(-EINVAL); | |
353 | ||
354 | /* | |
355 | * Attempt to derive an IRQ for this device from a parent bridge's | |
356 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
357 | */ | |
358 | while (irq < 0 && bridge->bus->self) { | |
359 | pin = (pin + PCI_SLOT(bridge->devfn)) % 4; | |
360 | bridge = bridge->bus->self; | |
361 | ||
362 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
363 | /* PC card has the same IRQ as its cardbridge */ | |
4be44fcd LB |
364 | pci_read_config_byte(bridge, PCI_INTERRUPT_PIN, |
365 | &bridge_pin); | |
1da177e4 | 366 | if (!bridge_pin) { |
4be44fcd LB |
367 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
368 | "No interrupt pin configured for device %s\n", | |
369 | pci_name(bridge))); | |
1da177e4 LT |
370 | return_VALUE(-1); |
371 | } | |
372 | /* Pin is from 0 to 3 */ | |
4be44fcd | 373 | bridge_pin--; |
1da177e4 LT |
374 | pin = bridge_pin; |
375 | } | |
376 | ||
377 | irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), | |
4be44fcd LB |
378 | pin, edge_level, active_high_low, |
379 | link, func); | |
1da177e4 LT |
380 | } |
381 | ||
382 | if (irq < 0) { | |
4be44fcd LB |
383 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
384 | "Unable to derive IRQ for device %s\n", | |
385 | pci_name(dev))); | |
1da177e4 LT |
386 | return_VALUE(-1); |
387 | } | |
388 | ||
389 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n", | |
4be44fcd | 390 | irq, pci_name(dev), pci_name(bridge))); |
1da177e4 LT |
391 | |
392 | return_VALUE(irq); | |
393 | } | |
394 | ||
395 | /* | |
396 | * acpi_pci_irq_enable | |
397 | * success: return 0 | |
398 | * failure: return < 0 | |
399 | */ | |
400 | ||
4be44fcd | 401 | int acpi_pci_irq_enable(struct pci_dev *dev) |
1da177e4 | 402 | { |
4be44fcd LB |
403 | int irq = 0; |
404 | u8 pin = 0; | |
405 | int edge_level = ACPI_LEVEL_SENSITIVE; | |
406 | int active_high_low = ACPI_ACTIVE_LOW; | |
407 | char *link = NULL; | |
408 | int rc; | |
1da177e4 LT |
409 | |
410 | ACPI_FUNCTION_TRACE("acpi_pci_irq_enable"); | |
411 | ||
412 | if (!dev) | |
413 | return_VALUE(-EINVAL); | |
4be44fcd | 414 | |
1da177e4 LT |
415 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); |
416 | if (!pin) { | |
4be44fcd LB |
417 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
418 | "No interrupt pin configured for device %s\n", | |
419 | pci_name(dev))); | |
1da177e4 LT |
420 | return_VALUE(0); |
421 | } | |
422 | pin--; | |
423 | ||
424 | if (!dev->bus) { | |
4be44fcd LB |
425 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
426 | "Invalid (NULL) 'bus' field\n")); | |
1da177e4 LT |
427 | return_VALUE(-ENODEV); |
428 | } | |
429 | ||
430 | /* | |
431 | * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT | |
432 | * values override any BIOS-assigned IRQs set during boot. | |
433 | */ | |
4be44fcd LB |
434 | irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
435 | &edge_level, &active_high_low, &link, | |
436 | acpi_pci_allocate_irq); | |
1da177e4 LT |
437 | |
438 | /* | |
439 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
440 | * device's parent bridge. | |
441 | */ | |
442 | if (irq < 0) | |
4be44fcd LB |
443 | irq = acpi_pci_irq_derive(dev, pin, &edge_level, |
444 | &active_high_low, &link, | |
445 | acpi_pci_allocate_irq); | |
446 | ||
1da177e4 LT |
447 | /* |
448 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
449 | * driver reported one, then use it. Exit in any case. | |
450 | */ | |
451 | if (irq < 0) { | |
452 | printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI", | |
4be44fcd | 453 | pci_name(dev), ('A' + pin)); |
1da177e4 | 454 | /* Interrupt Line values above 0xF are forbidden */ |
44f8e1a2 | 455 | if (dev->irq > 0 && (dev->irq <= 0xF)) { |
1da177e4 | 456 | printk(" - using IRQ %d\n", dev->irq); |
4be44fcd LB |
457 | acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, |
458 | ACPI_ACTIVE_LOW); | |
1da177e4 | 459 | return_VALUE(0); |
4be44fcd | 460 | } else { |
1da177e4 LT |
461 | printk("\n"); |
462 | return_VALUE(0); | |
463 | } | |
4be44fcd | 464 | } |
1da177e4 | 465 | |
349f0d56 KK |
466 | rc = acpi_register_gsi(irq, edge_level, active_high_low); |
467 | if (rc < 0) { | |
468 | printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: failed " | |
469 | "to register GSI\n", pci_name(dev), ('A' + pin)); | |
470 | return_VALUE(rc); | |
471 | } | |
472 | dev->irq = rc; | |
1da177e4 LT |
473 | |
474 | printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ", | |
4be44fcd | 475 | pci_name(dev), 'A' + pin); |
1da177e4 LT |
476 | |
477 | if (link) | |
478 | printk("Link [%s] -> ", link); | |
479 | ||
480 | printk("GSI %u (%s, %s) -> IRQ %d\n", irq, | |
4be44fcd LB |
481 | (edge_level == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", |
482 | (active_high_low == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); | |
1da177e4 LT |
483 | |
484 | return_VALUE(0); | |
485 | } | |
1da177e4 | 486 | |
4be44fcd | 487 | EXPORT_SYMBOL(acpi_pci_irq_enable); |
1da177e4 | 488 | |
87bec66b | 489 | /* FIXME: implement x86/x86_64 version */ |
4be44fcd LB |
490 | void __attribute__ ((weak)) acpi_unregister_gsi(u32 i) |
491 | { | |
492 | } | |
87bec66b | 493 | |
4be44fcd | 494 | void acpi_pci_irq_disable(struct pci_dev *dev) |
1da177e4 | 495 | { |
4be44fcd LB |
496 | int gsi = 0; |
497 | u8 pin = 0; | |
498 | int edge_level = ACPI_LEVEL_SENSITIVE; | |
499 | int active_high_low = ACPI_ACTIVE_LOW; | |
1da177e4 LT |
500 | |
501 | ACPI_FUNCTION_TRACE("acpi_pci_irq_disable"); | |
502 | ||
5f0110f2 | 503 | if (!dev || !dev->bus) |
1da177e4 LT |
504 | return_VOID; |
505 | ||
506 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); | |
507 | if (!pin) | |
508 | return_VOID; | |
509 | pin--; | |
510 | ||
1da177e4 LT |
511 | /* |
512 | * First we check the PCI IRQ routing table (PRT) for an IRQ. | |
513 | */ | |
4be44fcd LB |
514 | gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
515 | &edge_level, &active_high_low, NULL, | |
516 | acpi_pci_free_irq); | |
1da177e4 LT |
517 | /* |
518 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
519 | * device's parent bridge. | |
520 | */ | |
521 | if (gsi < 0) | |
4be44fcd LB |
522 | gsi = acpi_pci_irq_derive(dev, pin, |
523 | &edge_level, &active_high_low, NULL, | |
524 | acpi_pci_free_irq); | |
1da177e4 LT |
525 | if (gsi < 0) |
526 | return_VOID; | |
527 | ||
528 | /* | |
529 | * TBD: It might be worth clearing dev->irq by magic constant | |
530 | * (e.g. PCI_UNDEFINED_IRQ). | |
531 | */ | |
532 | ||
533 | printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n", | |
534 | pci_name(dev)); | |
535 | ||
536 | acpi_unregister_gsi(gsi); | |
537 | ||
538 | return_VOID; | |
539 | } |