Commit | Line | Data |
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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 | 27 | |
391df5dc | 28 | #include <linux/dmi.h> |
1da177e4 LT |
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 |
f52fd66d | 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 | 55 | struct acpi_prt_entry *entry = NULL; |
1da177e4 | 56 | |
1da177e4 | 57 | if (!acpi_prt.count) |
d550d98d | 58 | return NULL; |
1da177e4 LT |
59 | |
60 | /* | |
61 | * Parse through all PRT entries looking for a match on the specified | |
62 | * PCI device's segment, bus, device, and pin (don't care about func). | |
63 | * | |
64 | */ | |
65 | spin_lock(&acpi_prt_lock); | |
1a3b77ae | 66 | list_for_each_entry(entry, &acpi_prt.entries, node) { |
4be44fcd LB |
67 | if ((segment == entry->id.segment) |
68 | && (bus == entry->id.bus) | |
69 | && (device == entry->id.device) | |
70 | && (pin == entry->pin)) { | |
1da177e4 | 71 | spin_unlock(&acpi_prt_lock); |
d550d98d | 72 | return entry; |
1da177e4 LT |
73 | } |
74 | } | |
75 | ||
76 | spin_unlock(&acpi_prt_lock); | |
d550d98d | 77 | return NULL; |
1da177e4 LT |
78 | } |
79 | ||
391df5dc BH |
80 | /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */ |
81 | static struct dmi_system_id medion_md9580[] = { | |
82 | { | |
83 | .ident = "Medion MD9580-F laptop", | |
84 | .matches = { | |
85 | DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"), | |
86 | DMI_MATCH(DMI_PRODUCT_NAME, "A555"), | |
87 | }, | |
88 | }, | |
89 | { } | |
90 | }; | |
91 | ||
92 | /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */ | |
93 | static struct dmi_system_id dell_optiplex[] = { | |
94 | { | |
95 | .ident = "Dell Optiplex GX1", | |
96 | .matches = { | |
97 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
98 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"), | |
99 | }, | |
100 | }, | |
101 | { } | |
102 | }; | |
103 | ||
104 | /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */ | |
105 | static struct dmi_system_id hp_t5710[] = { | |
106 | { | |
107 | .ident = "HP t5710", | |
108 | .matches = { | |
109 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
110 | DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"), | |
111 | DMI_MATCH(DMI_BOARD_NAME, "098Ch"), | |
112 | }, | |
113 | }, | |
114 | { } | |
115 | }; | |
116 | ||
117 | struct prt_quirk { | |
118 | struct dmi_system_id *system; | |
119 | unsigned int segment; | |
120 | unsigned int bus; | |
121 | unsigned int device; | |
122 | unsigned char pin; | |
123 | char *source; /* according to BIOS */ | |
124 | char *actual_source; | |
125 | }; | |
126 | ||
127 | /* | |
128 | * These systems have incorrect _PRT entries. The BIOS claims the PCI | |
129 | * interrupt at the listed segment/bus/device/pin is connected to the first | |
130 | * link device, but it is actually connected to the second. | |
131 | */ | |
132 | static struct prt_quirk prt_quirks[] = { | |
133 | { medion_md9580, 0, 0, 9, 'A', | |
b97d4803 BH |
134 | "\\_SB_.PCI0.ISA_.LNKA", |
135 | "\\_SB_.PCI0.ISA_.LNKB"}, | |
391df5dc BH |
136 | { dell_optiplex, 0, 0, 0xd, 'A', |
137 | "\\_SB_.LNKB", | |
138 | "\\_SB_.LNKA"}, | |
139 | { hp_t5710, 0, 0, 1, 'A', | |
140 | "\\_SB_.PCI0.LNK1", | |
141 | "\\_SB_.PCI0.LNK3"}, | |
142 | }; | |
143 | ||
144 | static void | |
145 | do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt) | |
146 | { | |
147 | int i; | |
148 | struct prt_quirk *quirk; | |
149 | ||
150 | for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) { | |
151 | quirk = &prt_quirks[i]; | |
152 | ||
153 | /* All current quirks involve link devices, not GSIs */ | |
154 | if (!prt->source) | |
155 | continue; | |
156 | ||
157 | if (dmi_check_system(quirk->system) && | |
158 | entry->id.segment == quirk->segment && | |
159 | entry->id.bus == quirk->bus && | |
160 | entry->id.device == quirk->device && | |
161 | entry->pin + 'A' == quirk->pin && | |
162 | !strcmp(prt->source, quirk->source) && | |
163 | strlen(prt->source) >= strlen(quirk->actual_source)) { | |
164 | printk(KERN_WARNING PREFIX "firmware reports " | |
c83642d5 | 165 | "%04x:%02x:%02x PCI INT %c connected to %s; " |
391df5dc BH |
166 | "changing to %s\n", |
167 | entry->id.segment, entry->id.bus, | |
168 | entry->id.device, 'A' + entry->pin, | |
169 | prt->source, quirk->actual_source); | |
170 | strcpy(prt->source, quirk->actual_source); | |
171 | } | |
172 | } | |
173 | } | |
174 | ||
1da177e4 | 175 | static int |
4be44fcd LB |
176 | acpi_pci_irq_add_entry(acpi_handle handle, |
177 | int segment, int bus, struct acpi_pci_routing_table *prt) | |
1da177e4 | 178 | { |
4be44fcd | 179 | struct acpi_prt_entry *entry = NULL; |
1da177e4 | 180 | |
36bcbec7 | 181 | entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); |
1da177e4 | 182 | if (!entry) |
d550d98d | 183 | return -ENOMEM; |
1da177e4 LT |
184 | |
185 | entry->id.segment = segment; | |
186 | entry->id.bus = bus; | |
187 | entry->id.device = (prt->address >> 16) & 0xFFFF; | |
1da177e4 LT |
188 | entry->pin = prt->pin; |
189 | ||
391df5dc BH |
190 | do_prt_fixups(entry, prt); |
191 | ||
1da177e4 LT |
192 | /* |
193 | * Type 1: Dynamic | |
194 | * --------------- | |
195 | * The 'source' field specifies the PCI interrupt link device used to | |
196 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' | |
197 | * indicates which resource descriptor in the resource template (of | |
198 | * the link device) this interrupt is allocated from. | |
199 | * | |
200 | * NOTE: Don't query the Link Device for IRQ information at this time | |
201 | * because Link Device enumeration may not have occurred yet | |
202 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI | |
203 | * namespace). | |
204 | */ | |
205 | if (prt->source[0]) { | |
206 | acpi_get_handle(handle, prt->source, &entry->link.handle); | |
207 | entry->link.index = prt->source_index; | |
208 | } | |
209 | /* | |
210 | * Type 2: Static | |
211 | * -------------- | |
212 | * The 'source' field is NULL, and the 'source_index' field specifies | |
213 | * the IRQ value, which is hardwired to specific interrupt inputs on | |
214 | * the interrupt controller. | |
215 | */ | |
216 | else | |
217 | entry->link.index = prt->source_index; | |
218 | ||
219 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, | |
21a53283 | 220 | " %04x:%02x:%02x[%c] -> %s[%d]\n", |
4be44fcd LB |
221 | entry->id.segment, entry->id.bus, |
222 | entry->id.device, ('A' + entry->pin), prt->source, | |
223 | entry->link.index)); | |
1da177e4 LT |
224 | |
225 | spin_lock(&acpi_prt_lock); | |
226 | list_add_tail(&entry->node, &acpi_prt.entries); | |
227 | acpi_prt.count++; | |
228 | spin_unlock(&acpi_prt_lock); | |
229 | ||
d550d98d | 230 | return 0; |
1da177e4 LT |
231 | } |
232 | ||
1da177e4 | 233 | static void |
4be44fcd | 234 | acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry) |
1da177e4 | 235 | { |
4be44fcd | 236 | if (segment == entry->id.segment && bus == entry->id.bus) { |
1da177e4 LT |
237 | acpi_prt.count--; |
238 | list_del(&entry->node); | |
239 | kfree(entry); | |
240 | } | |
241 | } | |
242 | ||
4be44fcd | 243 | int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus) |
1da177e4 | 244 | { |
2320ac6c BH |
245 | acpi_status status; |
246 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
247 | struct acpi_pci_routing_table *entry; | |
4be44fcd | 248 | static int first_time = 1; |
1da177e4 | 249 | |
1da177e4 LT |
250 | if (first_time) { |
251 | acpi_prt.count = 0; | |
252 | INIT_LIST_HEAD(&acpi_prt.entries); | |
253 | first_time = 0; | |
254 | } | |
255 | ||
2320ac6c BH |
256 | /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */ |
257 | status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
258 | if (ACPI_FAILURE(status)) | |
259 | return -ENODEV; | |
1da177e4 LT |
260 | |
261 | printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", | |
2320ac6c | 262 | (char *) buffer.pointer); |
1da177e4 | 263 | |
2320ac6c | 264 | kfree(buffer.pointer); |
1da177e4 | 265 | |
2320ac6c | 266 | buffer.length = ACPI_ALLOCATE_BUFFER; |
1da177e4 | 267 | buffer.pointer = NULL; |
1da177e4 LT |
268 | |
269 | status = acpi_get_irq_routing_table(handle, &buffer); | |
270 | if (ACPI_FAILURE(status)) { | |
a6fc6720 TR |
271 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", |
272 | acpi_format_exception(status))); | |
1da177e4 | 273 | kfree(buffer.pointer); |
d550d98d | 274 | return -ENODEV; |
1da177e4 LT |
275 | } |
276 | ||
2320ac6c | 277 | entry = buffer.pointer; |
1da177e4 LT |
278 | while (entry && (entry->length > 0)) { |
279 | acpi_pci_irq_add_entry(handle, segment, bus, entry); | |
280 | entry = (struct acpi_pci_routing_table *) | |
4be44fcd | 281 | ((unsigned long)entry + entry->length); |
1da177e4 LT |
282 | } |
283 | ||
2320ac6c | 284 | kfree(buffer.pointer); |
d550d98d | 285 | return 0; |
1da177e4 LT |
286 | } |
287 | ||
4be44fcd | 288 | void acpi_pci_irq_del_prt(int segment, int bus) |
1da177e4 | 289 | { |
4be44fcd LB |
290 | struct list_head *node = NULL, *n = NULL; |
291 | struct acpi_prt_entry *entry = NULL; | |
1da177e4 | 292 | |
4be44fcd | 293 | if (!acpi_prt.count) { |
1da177e4 LT |
294 | return; |
295 | } | |
296 | ||
4be44fcd | 297 | printk(KERN_DEBUG |
21a53283 BH |
298 | "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n", |
299 | segment, bus); | |
1da177e4 LT |
300 | spin_lock(&acpi_prt_lock); |
301 | list_for_each_safe(node, n, &acpi_prt.entries) { | |
302 | entry = list_entry(node, struct acpi_prt_entry, node); | |
303 | ||
304 | acpi_pci_irq_del_entry(segment, bus, entry); | |
305 | } | |
306 | spin_unlock(&acpi_prt_lock); | |
307 | } | |
4be44fcd | 308 | |
1da177e4 LT |
309 | /* -------------------------------------------------------------------------- |
310 | PCI Interrupt Routing Support | |
311 | -------------------------------------------------------------------------- */ | |
4be44fcd | 312 | typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **); |
1da177e4 | 313 | |
87bec66b DSL |
314 | static int |
315 | acpi_pci_allocate_irq(struct acpi_prt_entry *entry, | |
50eca3eb | 316 | int *triggering, int *polarity, char **link) |
87bec66b | 317 | { |
4be44fcd | 318 | int irq; |
87bec66b | 319 | |
87bec66b DSL |
320 | |
321 | if (entry->link.handle) { | |
322 | irq = acpi_pci_link_allocate_irq(entry->link.handle, | |
50eca3eb BM |
323 | entry->link.index, triggering, |
324 | polarity, link); | |
87bec66b | 325 | if (irq < 0) { |
cece9296 LB |
326 | printk(KERN_WARNING PREFIX |
327 | "Invalid IRQ link routing entry\n"); | |
d550d98d | 328 | return -1; |
87bec66b DSL |
329 | } |
330 | } else { | |
331 | irq = entry->link.index; | |
50eca3eb BM |
332 | *triggering = ACPI_LEVEL_SENSITIVE; |
333 | *polarity = ACPI_ACTIVE_LOW; | |
87bec66b DSL |
334 | } |
335 | ||
336 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq)); | |
d550d98d | 337 | return irq; |
87bec66b DSL |
338 | } |
339 | ||
340 | static int | |
341 | acpi_pci_free_irq(struct acpi_prt_entry *entry, | |
50eca3eb | 342 | int *triggering, int *polarity, char **link) |
87bec66b | 343 | { |
4be44fcd | 344 | int irq; |
87bec66b | 345 | |
87bec66b DSL |
346 | if (entry->link.handle) { |
347 | irq = acpi_pci_link_free_irq(entry->link.handle); | |
348 | } else { | |
349 | irq = entry->link.index; | |
350 | } | |
d550d98d | 351 | return irq; |
87bec66b | 352 | } |
4be44fcd | 353 | |
1da177e4 LT |
354 | /* |
355 | * acpi_pci_irq_lookup | |
356 | * success: return IRQ >= 0 | |
357 | * failure: return -1 | |
358 | */ | |
359 | static int | |
4be44fcd LB |
360 | acpi_pci_irq_lookup(struct pci_bus *bus, |
361 | int device, | |
362 | int pin, | |
50eca3eb BM |
363 | int *triggering, |
364 | int *polarity, char **link, irq_lookup_func func) | |
1da177e4 | 365 | { |
4be44fcd | 366 | struct acpi_prt_entry *entry = NULL; |
1da177e4 LT |
367 | int segment = pci_domain_nr(bus); |
368 | int bus_nr = bus->number; | |
87bec66b | 369 | int ret; |
1da177e4 | 370 | |
1da177e4 | 371 | |
4be44fcd | 372 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
21a53283 | 373 | "Searching for _PRT entry for %04x:%02x:%02x[%c]\n", |
4be44fcd | 374 | segment, bus_nr, device, ('A' + pin))); |
1da177e4 | 375 | |
4be44fcd | 376 | entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); |
1da177e4 | 377 | if (!entry) { |
21a53283 | 378 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n")); |
d550d98d | 379 | return -1; |
1da177e4 | 380 | } |
4be44fcd | 381 | |
50eca3eb | 382 | ret = func(entry, triggering, polarity, link); |
d550d98d | 383 | return ret; |
1da177e4 LT |
384 | } |
385 | ||
386 | /* | |
387 | * acpi_pci_irq_derive | |
388 | * success: return IRQ >= 0 | |
389 | * failure: return < 0 | |
390 | */ | |
391 | static int | |
4be44fcd LB |
392 | acpi_pci_irq_derive(struct pci_dev *dev, |
393 | int pin, | |
50eca3eb BM |
394 | int *triggering, |
395 | int *polarity, char **link, irq_lookup_func func) | |
1da177e4 | 396 | { |
4be44fcd LB |
397 | struct pci_dev *bridge = dev; |
398 | int irq = -1; | |
c83642d5 | 399 | u8 bridge_pin = 0, orig_pin = pin; |
1da177e4 | 400 | |
1da177e4 | 401 | |
1da177e4 LT |
402 | /* |
403 | * Attempt to derive an IRQ for this device from a parent bridge's | |
404 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
405 | */ | |
406 | while (irq < 0 && bridge->bus->self) { | |
407 | pin = (pin + PCI_SLOT(bridge->devfn)) % 4; | |
408 | bridge = bridge->bus->self; | |
409 | ||
410 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
411 | /* PC card has the same IRQ as its cardbridge */ | |
8015a014 | 412 | bridge_pin = bridge->pin; |
1da177e4 | 413 | if (!bridge_pin) { |
4be44fcd LB |
414 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
415 | "No interrupt pin configured for device %s\n", | |
416 | pci_name(bridge))); | |
d550d98d | 417 | return -1; |
1da177e4 LT |
418 | } |
419 | /* Pin is from 0 to 3 */ | |
4be44fcd | 420 | bridge_pin--; |
1da177e4 LT |
421 | pin = bridge_pin; |
422 | } | |
423 | ||
424 | irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), | |
50eca3eb | 425 | pin, triggering, polarity, |
4be44fcd | 426 | link, func); |
1da177e4 LT |
427 | } |
428 | ||
429 | if (irq < 0) { | |
c83642d5 BH |
430 | dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n", |
431 | 'A' + orig_pin); | |
d550d98d | 432 | return -1; |
1da177e4 LT |
433 | } |
434 | ||
435 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n", | |
4be44fcd | 436 | irq, pci_name(dev), pci_name(bridge))); |
1da177e4 | 437 | |
d550d98d | 438 | return irq; |
1da177e4 LT |
439 | } |
440 | ||
441 | /* | |
442 | * acpi_pci_irq_enable | |
443 | * success: return 0 | |
444 | * failure: return < 0 | |
445 | */ | |
446 | ||
4be44fcd | 447 | int acpi_pci_irq_enable(struct pci_dev *dev) |
1da177e4 | 448 | { |
4be44fcd LB |
449 | int irq = 0; |
450 | u8 pin = 0; | |
50eca3eb BM |
451 | int triggering = ACPI_LEVEL_SENSITIVE; |
452 | int polarity = ACPI_ACTIVE_LOW; | |
4be44fcd | 453 | char *link = NULL; |
c83642d5 | 454 | char link_desc[16]; |
4be44fcd | 455 | int rc; |
1da177e4 | 456 | |
1da177e4 | 457 | |
8015a014 | 458 | pin = dev->pin; |
1da177e4 | 459 | if (!pin) { |
4be44fcd LB |
460 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
461 | "No interrupt pin configured for device %s\n", | |
462 | pci_name(dev))); | |
d550d98d | 463 | return 0; |
1da177e4 LT |
464 | } |
465 | pin--; | |
466 | ||
1da177e4 LT |
467 | /* |
468 | * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT | |
469 | * values override any BIOS-assigned IRQs set during boot. | |
470 | */ | |
4be44fcd | 471 | irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
50eca3eb | 472 | &triggering, &polarity, &link, |
4be44fcd | 473 | acpi_pci_allocate_irq); |
1da177e4 LT |
474 | |
475 | /* | |
476 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
477 | * device's parent bridge. | |
478 | */ | |
479 | if (irq < 0) | |
50eca3eb BM |
480 | irq = acpi_pci_irq_derive(dev, pin, &triggering, |
481 | &polarity, &link, | |
4be44fcd LB |
482 | acpi_pci_allocate_irq); |
483 | ||
96c2a876 AC |
484 | if (irq < 0) { |
485 | /* | |
486 | * IDE legacy mode controller IRQs are magic. Why do compat | |
487 | * extensions always make such a nasty mess. | |
488 | */ | |
489 | if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && | |
490 | (dev->class & 0x05) == 0) | |
491 | return 0; | |
492 | } | |
1da177e4 LT |
493 | /* |
494 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
495 | * driver reported one, then use it. Exit in any case. | |
496 | */ | |
497 | if (irq < 0) { | |
c83642d5 | 498 | dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin); |
1da177e4 | 499 | /* Interrupt Line values above 0xF are forbidden */ |
44f8e1a2 | 500 | if (dev->irq > 0 && (dev->irq <= 0xF)) { |
1da177e4 | 501 | printk(" - using IRQ %d\n", dev->irq); |
4be44fcd LB |
502 | acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, |
503 | ACPI_ACTIVE_LOW); | |
d550d98d | 504 | return 0; |
4be44fcd | 505 | } else { |
1da177e4 | 506 | printk("\n"); |
d550d98d | 507 | return 0; |
1da177e4 | 508 | } |
4be44fcd | 509 | } |
1da177e4 | 510 | |
50eca3eb | 511 | rc = acpi_register_gsi(irq, triggering, polarity); |
349f0d56 | 512 | if (rc < 0) { |
c83642d5 BH |
513 | dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n", |
514 | 'A' + pin); | |
d550d98d | 515 | return rc; |
349f0d56 KK |
516 | } |
517 | dev->irq = rc; | |
1da177e4 | 518 | |
1da177e4 | 519 | if (link) |
c83642d5 BH |
520 | snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); |
521 | else | |
522 | link_desc[0] = '\0'; | |
1da177e4 | 523 | |
c83642d5 BH |
524 | dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n", |
525 | 'A' + pin, link_desc, irq, | |
526 | (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", | |
527 | (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); | |
1da177e4 | 528 | |
d550d98d | 529 | return 0; |
1da177e4 | 530 | } |
1da177e4 | 531 | |
87bec66b | 532 | /* FIXME: implement x86/x86_64 version */ |
4be44fcd LB |
533 | void __attribute__ ((weak)) acpi_unregister_gsi(u32 i) |
534 | { | |
535 | } | |
87bec66b | 536 | |
4be44fcd | 537 | void acpi_pci_irq_disable(struct pci_dev *dev) |
1da177e4 | 538 | { |
4be44fcd LB |
539 | int gsi = 0; |
540 | u8 pin = 0; | |
50eca3eb BM |
541 | int triggering = ACPI_LEVEL_SENSITIVE; |
542 | int polarity = ACPI_ACTIVE_LOW; | |
1da177e4 | 543 | |
1da177e4 | 544 | |
8015a014 | 545 | pin = dev->pin; |
1da177e4 | 546 | if (!pin) |
d550d98d | 547 | return; |
1da177e4 LT |
548 | pin--; |
549 | ||
1da177e4 LT |
550 | /* |
551 | * First we check the PCI IRQ routing table (PRT) for an IRQ. | |
552 | */ | |
4be44fcd | 553 | gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
50eca3eb | 554 | &triggering, &polarity, NULL, |
4be44fcd | 555 | acpi_pci_free_irq); |
1da177e4 LT |
556 | /* |
557 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
558 | * device's parent bridge. | |
559 | */ | |
560 | if (gsi < 0) | |
4be44fcd | 561 | gsi = acpi_pci_irq_derive(dev, pin, |
50eca3eb | 562 | &triggering, &polarity, NULL, |
4be44fcd | 563 | acpi_pci_free_irq); |
1da177e4 | 564 | if (gsi < 0) |
d550d98d | 565 | return; |
1da177e4 LT |
566 | |
567 | /* | |
568 | * TBD: It might be worth clearing dev->irq by magic constant | |
569 | * (e.g. PCI_UNDEFINED_IRQ). | |
570 | */ | |
571 | ||
c83642d5 | 572 | dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin); |
1da177e4 | 573 | acpi_unregister_gsi(gsi); |
1da177e4 | 574 | } |