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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 | |
f748bafa BH |
44 | struct acpi_prt_entry { |
45 | struct list_head node; | |
46 | struct acpi_pci_id id; | |
47 | u8 pin; | |
48 | struct { | |
49 | acpi_handle handle; | |
50 | u32 index; | |
51 | } link; | |
52 | u32 irq; | |
53 | }; | |
54 | ||
55 | struct acpi_prt_list { | |
56 | int count; | |
57 | struct list_head entries; | |
58 | }; | |
59 | ||
4be44fcd | 60 | static struct acpi_prt_list acpi_prt; |
1da177e4 LT |
61 | static DEFINE_SPINLOCK(acpi_prt_lock); |
62 | ||
cf68b80b BH |
63 | static inline char pin_name(int pin) |
64 | { | |
e64e9db5 | 65 | return 'A' + pin - 1; |
cf68b80b BH |
66 | } |
67 | ||
1da177e4 LT |
68 | /* -------------------------------------------------------------------------- |
69 | PCI IRQ Routing Table (PRT) Support | |
70 | -------------------------------------------------------------------------- */ | |
71 | ||
063563b4 BH |
72 | static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev, |
73 | int pin) | |
1da177e4 | 74 | { |
4be44fcd | 75 | struct acpi_prt_entry *entry = NULL; |
063563b4 BH |
76 | int segment = pci_domain_nr(dev->bus); |
77 | int bus = dev->bus->number; | |
78 | int device = PCI_SLOT(dev->devfn); | |
1da177e4 | 79 | |
1da177e4 | 80 | if (!acpi_prt.count) |
d550d98d | 81 | return NULL; |
1da177e4 LT |
82 | |
83 | /* | |
84 | * Parse through all PRT entries looking for a match on the specified | |
85 | * PCI device's segment, bus, device, and pin (don't care about func). | |
86 | * | |
87 | */ | |
88 | spin_lock(&acpi_prt_lock); | |
1a3b77ae | 89 | list_for_each_entry(entry, &acpi_prt.entries, node) { |
4be44fcd LB |
90 | if ((segment == entry->id.segment) |
91 | && (bus == entry->id.bus) | |
92 | && (device == entry->id.device) | |
93 | && (pin == entry->pin)) { | |
1da177e4 | 94 | spin_unlock(&acpi_prt_lock); |
d550d98d | 95 | return entry; |
1da177e4 LT |
96 | } |
97 | } | |
98 | ||
99 | spin_unlock(&acpi_prt_lock); | |
d550d98d | 100 | return NULL; |
1da177e4 LT |
101 | } |
102 | ||
391df5dc BH |
103 | /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */ |
104 | static struct dmi_system_id medion_md9580[] = { | |
105 | { | |
106 | .ident = "Medion MD9580-F laptop", | |
107 | .matches = { | |
108 | DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"), | |
109 | DMI_MATCH(DMI_PRODUCT_NAME, "A555"), | |
110 | }, | |
111 | }, | |
112 | { } | |
113 | }; | |
114 | ||
115 | /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */ | |
116 | static struct dmi_system_id dell_optiplex[] = { | |
117 | { | |
118 | .ident = "Dell Optiplex GX1", | |
119 | .matches = { | |
120 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
121 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"), | |
122 | }, | |
123 | }, | |
124 | { } | |
125 | }; | |
126 | ||
127 | /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */ | |
128 | static struct dmi_system_id hp_t5710[] = { | |
129 | { | |
130 | .ident = "HP t5710", | |
131 | .matches = { | |
132 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
133 | DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"), | |
134 | DMI_MATCH(DMI_BOARD_NAME, "098Ch"), | |
135 | }, | |
136 | }, | |
137 | { } | |
138 | }; | |
139 | ||
140 | struct prt_quirk { | |
141 | struct dmi_system_id *system; | |
142 | unsigned int segment; | |
143 | unsigned int bus; | |
144 | unsigned int device; | |
145 | unsigned char pin; | |
146 | char *source; /* according to BIOS */ | |
147 | char *actual_source; | |
148 | }; | |
149 | ||
c458033c BH |
150 | #define PCI_INTX_PIN(c) (c - 'A' + 1) |
151 | ||
391df5dc BH |
152 | /* |
153 | * These systems have incorrect _PRT entries. The BIOS claims the PCI | |
154 | * interrupt at the listed segment/bus/device/pin is connected to the first | |
155 | * link device, but it is actually connected to the second. | |
156 | */ | |
157 | static struct prt_quirk prt_quirks[] = { | |
c458033c | 158 | { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'), |
b97d4803 BH |
159 | "\\_SB_.PCI0.ISA_.LNKA", |
160 | "\\_SB_.PCI0.ISA_.LNKB"}, | |
c458033c | 161 | { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'), |
391df5dc BH |
162 | "\\_SB_.LNKB", |
163 | "\\_SB_.LNKA"}, | |
c458033c | 164 | { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'), |
391df5dc BH |
165 | "\\_SB_.PCI0.LNK1", |
166 | "\\_SB_.PCI0.LNK3"}, | |
167 | }; | |
168 | ||
169 | static void | |
170 | do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt) | |
171 | { | |
172 | int i; | |
173 | struct prt_quirk *quirk; | |
174 | ||
175 | for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) { | |
176 | quirk = &prt_quirks[i]; | |
177 | ||
178 | /* All current quirks involve link devices, not GSIs */ | |
179 | if (!prt->source) | |
180 | continue; | |
181 | ||
182 | if (dmi_check_system(quirk->system) && | |
183 | entry->id.segment == quirk->segment && | |
184 | entry->id.bus == quirk->bus && | |
185 | entry->id.device == quirk->device && | |
c458033c | 186 | entry->pin == quirk->pin && |
391df5dc BH |
187 | !strcmp(prt->source, quirk->source) && |
188 | strlen(prt->source) >= strlen(quirk->actual_source)) { | |
189 | printk(KERN_WARNING PREFIX "firmware reports " | |
c83642d5 | 190 | "%04x:%02x:%02x PCI INT %c connected to %s; " |
391df5dc BH |
191 | "changing to %s\n", |
192 | entry->id.segment, entry->id.bus, | |
cf68b80b | 193 | entry->id.device, pin_name(entry->pin), |
391df5dc BH |
194 | prt->source, quirk->actual_source); |
195 | strcpy(prt->source, quirk->actual_source); | |
196 | } | |
197 | } | |
198 | } | |
199 | ||
1da177e4 | 200 | static int |
4be44fcd LB |
201 | acpi_pci_irq_add_entry(acpi_handle handle, |
202 | int segment, int bus, struct acpi_pci_routing_table *prt) | |
1da177e4 | 203 | { |
4be44fcd | 204 | struct acpi_prt_entry *entry = NULL; |
1da177e4 | 205 | |
36bcbec7 | 206 | entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); |
1da177e4 | 207 | if (!entry) |
d550d98d | 208 | return -ENOMEM; |
1da177e4 | 209 | |
e64e9db5 BH |
210 | /* |
211 | * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses | |
212 | * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert | |
213 | * it here. | |
214 | */ | |
1da177e4 LT |
215 | entry->id.segment = segment; |
216 | entry->id.bus = bus; | |
217 | entry->id.device = (prt->address >> 16) & 0xFFFF; | |
e64e9db5 | 218 | entry->pin = prt->pin + 1; |
1da177e4 | 219 | |
391df5dc BH |
220 | do_prt_fixups(entry, prt); |
221 | ||
1da177e4 LT |
222 | /* |
223 | * Type 1: Dynamic | |
224 | * --------------- | |
225 | * The 'source' field specifies the PCI interrupt link device used to | |
226 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' | |
227 | * indicates which resource descriptor in the resource template (of | |
228 | * the link device) this interrupt is allocated from. | |
229 | * | |
230 | * NOTE: Don't query the Link Device for IRQ information at this time | |
231 | * because Link Device enumeration may not have occurred yet | |
232 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI | |
233 | * namespace). | |
234 | */ | |
235 | if (prt->source[0]) { | |
236 | acpi_get_handle(handle, prt->source, &entry->link.handle); | |
237 | entry->link.index = prt->source_index; | |
238 | } | |
239 | /* | |
240 | * Type 2: Static | |
241 | * -------------- | |
242 | * The 'source' field is NULL, and the 'source_index' field specifies | |
243 | * the IRQ value, which is hardwired to specific interrupt inputs on | |
244 | * the interrupt controller. | |
245 | */ | |
246 | else | |
247 | entry->link.index = prt->source_index; | |
248 | ||
249 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, | |
21a53283 | 250 | " %04x:%02x:%02x[%c] -> %s[%d]\n", |
4be44fcd | 251 | entry->id.segment, entry->id.bus, |
cf68b80b BH |
252 | entry->id.device, pin_name(entry->pin), |
253 | prt->source, entry->link.index)); | |
1da177e4 LT |
254 | |
255 | spin_lock(&acpi_prt_lock); | |
256 | list_add_tail(&entry->node, &acpi_prt.entries); | |
257 | acpi_prt.count++; | |
258 | spin_unlock(&acpi_prt_lock); | |
259 | ||
d550d98d | 260 | return 0; |
1da177e4 LT |
261 | } |
262 | ||
1da177e4 | 263 | static void |
4be44fcd | 264 | acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry) |
1da177e4 | 265 | { |
4be44fcd | 266 | if (segment == entry->id.segment && bus == entry->id.bus) { |
1da177e4 LT |
267 | acpi_prt.count--; |
268 | list_del(&entry->node); | |
269 | kfree(entry); | |
270 | } | |
271 | } | |
272 | ||
4be44fcd | 273 | int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus) |
1da177e4 | 274 | { |
2320ac6c BH |
275 | acpi_status status; |
276 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
277 | struct acpi_pci_routing_table *entry; | |
4be44fcd | 278 | static int first_time = 1; |
1da177e4 | 279 | |
1da177e4 LT |
280 | if (first_time) { |
281 | acpi_prt.count = 0; | |
282 | INIT_LIST_HEAD(&acpi_prt.entries); | |
283 | first_time = 0; | |
284 | } | |
285 | ||
2320ac6c BH |
286 | /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */ |
287 | status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
288 | if (ACPI_FAILURE(status)) | |
289 | return -ENODEV; | |
1da177e4 LT |
290 | |
291 | printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", | |
2320ac6c | 292 | (char *) buffer.pointer); |
1da177e4 | 293 | |
2320ac6c | 294 | kfree(buffer.pointer); |
1da177e4 | 295 | |
2320ac6c | 296 | buffer.length = ACPI_ALLOCATE_BUFFER; |
1da177e4 | 297 | buffer.pointer = NULL; |
1da177e4 LT |
298 | |
299 | status = acpi_get_irq_routing_table(handle, &buffer); | |
300 | if (ACPI_FAILURE(status)) { | |
a6fc6720 TR |
301 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", |
302 | acpi_format_exception(status))); | |
1da177e4 | 303 | kfree(buffer.pointer); |
d550d98d | 304 | return -ENODEV; |
1da177e4 LT |
305 | } |
306 | ||
2320ac6c | 307 | entry = buffer.pointer; |
1da177e4 LT |
308 | while (entry && (entry->length > 0)) { |
309 | acpi_pci_irq_add_entry(handle, segment, bus, entry); | |
310 | entry = (struct acpi_pci_routing_table *) | |
4be44fcd | 311 | ((unsigned long)entry + entry->length); |
1da177e4 LT |
312 | } |
313 | ||
2320ac6c | 314 | kfree(buffer.pointer); |
d550d98d | 315 | return 0; |
1da177e4 LT |
316 | } |
317 | ||
4be44fcd | 318 | void acpi_pci_irq_del_prt(int segment, int bus) |
1da177e4 | 319 | { |
4be44fcd LB |
320 | struct list_head *node = NULL, *n = NULL; |
321 | struct acpi_prt_entry *entry = NULL; | |
1da177e4 | 322 | |
4be44fcd | 323 | if (!acpi_prt.count) { |
1da177e4 LT |
324 | return; |
325 | } | |
326 | ||
4be44fcd | 327 | printk(KERN_DEBUG |
21a53283 BH |
328 | "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n", |
329 | segment, bus); | |
1da177e4 LT |
330 | spin_lock(&acpi_prt_lock); |
331 | list_for_each_safe(node, n, &acpi_prt.entries) { | |
332 | entry = list_entry(node, struct acpi_prt_entry, node); | |
333 | ||
334 | acpi_pci_irq_del_entry(segment, bus, entry); | |
335 | } | |
336 | spin_unlock(&acpi_prt_lock); | |
337 | } | |
4be44fcd | 338 | |
1da177e4 LT |
339 | /* -------------------------------------------------------------------------- |
340 | PCI Interrupt Routing Support | |
341 | -------------------------------------------------------------------------- */ | |
4be44fcd | 342 | typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **); |
1da177e4 | 343 | |
87bec66b DSL |
344 | static int |
345 | acpi_pci_allocate_irq(struct acpi_prt_entry *entry, | |
50eca3eb | 346 | int *triggering, int *polarity, char **link) |
87bec66b | 347 | { |
4be44fcd | 348 | int irq; |
87bec66b | 349 | |
87bec66b DSL |
350 | |
351 | if (entry->link.handle) { | |
352 | irq = acpi_pci_link_allocate_irq(entry->link.handle, | |
50eca3eb BM |
353 | entry->link.index, triggering, |
354 | polarity, link); | |
87bec66b | 355 | if (irq < 0) { |
cece9296 LB |
356 | printk(KERN_WARNING PREFIX |
357 | "Invalid IRQ link routing entry\n"); | |
d550d98d | 358 | return -1; |
87bec66b DSL |
359 | } |
360 | } else { | |
361 | irq = entry->link.index; | |
50eca3eb BM |
362 | *triggering = ACPI_LEVEL_SENSITIVE; |
363 | *polarity = ACPI_ACTIVE_LOW; | |
87bec66b DSL |
364 | } |
365 | ||
c13f889a | 366 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq)); |
d550d98d | 367 | return irq; |
87bec66b DSL |
368 | } |
369 | ||
370 | static int | |
371 | acpi_pci_free_irq(struct acpi_prt_entry *entry, | |
50eca3eb | 372 | int *triggering, int *polarity, char **link) |
87bec66b | 373 | { |
4be44fcd | 374 | int irq; |
87bec66b | 375 | |
87bec66b DSL |
376 | if (entry->link.handle) { |
377 | irq = acpi_pci_link_free_irq(entry->link.handle); | |
378 | } else { | |
379 | irq = entry->link.index; | |
380 | } | |
d550d98d | 381 | return irq; |
87bec66b | 382 | } |
4be44fcd | 383 | |
1da177e4 LT |
384 | /* |
385 | * acpi_pci_irq_lookup | |
386 | * success: return IRQ >= 0 | |
387 | * failure: return -1 | |
388 | */ | |
389 | static int | |
063563b4 | 390 | acpi_pci_irq_lookup(struct pci_dev *dev, int pin, |
50eca3eb BM |
391 | int *triggering, |
392 | int *polarity, char **link, irq_lookup_func func) | |
1da177e4 | 393 | { |
4be44fcd | 394 | struct acpi_prt_entry *entry = NULL; |
87bec66b | 395 | int ret; |
1da177e4 | 396 | |
1da177e4 | 397 | |
063563b4 | 398 | entry = acpi_pci_irq_find_prt_entry(dev, pin); |
1da177e4 | 399 | if (!entry) { |
1350487e BH |
400 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No %s[%c] _PRT entry\n", |
401 | pci_name(dev), pin_name(pin))); | |
d550d98d | 402 | return -1; |
1da177e4 | 403 | } |
4be44fcd | 404 | |
1350487e BH |
405 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n", |
406 | pci_name(dev), pin_name(pin))); | |
407 | ||
50eca3eb | 408 | ret = func(entry, triggering, polarity, link); |
d550d98d | 409 | return ret; |
1da177e4 LT |
410 | } |
411 | ||
412 | /* | |
413 | * acpi_pci_irq_derive | |
414 | * success: return IRQ >= 0 | |
415 | * failure: return < 0 | |
416 | */ | |
417 | static int | |
4be44fcd LB |
418 | acpi_pci_irq_derive(struct pci_dev *dev, |
419 | int pin, | |
50eca3eb BM |
420 | int *triggering, |
421 | int *polarity, char **link, irq_lookup_func func) | |
1da177e4 | 422 | { |
4be44fcd LB |
423 | struct pci_dev *bridge = dev; |
424 | int irq = -1; | |
c83642d5 | 425 | u8 bridge_pin = 0, orig_pin = pin; |
1da177e4 | 426 | |
1da177e4 | 427 | |
1da177e4 LT |
428 | /* |
429 | * Attempt to derive an IRQ for this device from a parent bridge's | |
430 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
431 | */ | |
432 | while (irq < 0 && bridge->bus->self) { | |
e64e9db5 | 433 | pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1; |
1da177e4 LT |
434 | bridge = bridge->bus->self; |
435 | ||
436 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
437 | /* PC card has the same IRQ as its cardbridge */ | |
8015a014 | 438 | bridge_pin = bridge->pin; |
1da177e4 | 439 | if (!bridge_pin) { |
4be44fcd LB |
440 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
441 | "No interrupt pin configured for device %s\n", | |
442 | pci_name(bridge))); | |
d550d98d | 443 | return -1; |
1da177e4 | 444 | } |
1da177e4 LT |
445 | pin = bridge_pin; |
446 | } | |
447 | ||
063563b4 | 448 | irq = acpi_pci_irq_lookup(bridge, |
50eca3eb | 449 | pin, triggering, polarity, |
4be44fcd | 450 | link, func); |
1da177e4 LT |
451 | } |
452 | ||
453 | if (irq < 0) { | |
c83642d5 | 454 | dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n", |
cf68b80b | 455 | pin_name(orig_pin)); |
d550d98d | 456 | return -1; |
1da177e4 LT |
457 | } |
458 | ||
1350487e BH |
459 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derived GSI %d for %s INT %c from %s\n", |
460 | irq, pci_name(dev), pin_name(orig_pin), pci_name(bridge))); | |
1da177e4 | 461 | |
d550d98d | 462 | return irq; |
1da177e4 LT |
463 | } |
464 | ||
465 | /* | |
466 | * acpi_pci_irq_enable | |
467 | * success: return 0 | |
468 | * failure: return < 0 | |
469 | */ | |
470 | ||
4be44fcd | 471 | int acpi_pci_irq_enable(struct pci_dev *dev) |
1da177e4 | 472 | { |
c13f889a | 473 | int gsi = 0; |
4be44fcd | 474 | u8 pin = 0; |
50eca3eb BM |
475 | int triggering = ACPI_LEVEL_SENSITIVE; |
476 | int polarity = ACPI_ACTIVE_LOW; | |
4be44fcd | 477 | char *link = NULL; |
c83642d5 | 478 | char link_desc[16]; |
4be44fcd | 479 | int rc; |
1da177e4 | 480 | |
1da177e4 | 481 | |
8015a014 | 482 | pin = dev->pin; |
1da177e4 | 483 | if (!pin) { |
4be44fcd LB |
484 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
485 | "No interrupt pin configured for device %s\n", | |
486 | pci_name(dev))); | |
d550d98d | 487 | return 0; |
1da177e4 | 488 | } |
1da177e4 | 489 | |
1da177e4 LT |
490 | /* |
491 | * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT | |
492 | * values override any BIOS-assigned IRQs set during boot. | |
493 | */ | |
063563b4 | 494 | gsi = acpi_pci_irq_lookup(dev, pin, |
50eca3eb | 495 | &triggering, &polarity, &link, |
4be44fcd | 496 | acpi_pci_allocate_irq); |
1da177e4 LT |
497 | |
498 | /* | |
499 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
500 | * device's parent bridge. | |
501 | */ | |
c13f889a BH |
502 | if (gsi < 0) |
503 | gsi = acpi_pci_irq_derive(dev, pin, &triggering, | |
50eca3eb | 504 | &polarity, &link, |
4be44fcd LB |
505 | acpi_pci_allocate_irq); |
506 | ||
c13f889a | 507 | if (gsi < 0) { |
96c2a876 AC |
508 | /* |
509 | * IDE legacy mode controller IRQs are magic. Why do compat | |
510 | * extensions always make such a nasty mess. | |
511 | */ | |
512 | if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && | |
513 | (dev->class & 0x05) == 0) | |
514 | return 0; | |
515 | } | |
1da177e4 LT |
516 | /* |
517 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
518 | * driver reported one, then use it. Exit in any case. | |
519 | */ | |
c13f889a | 520 | if (gsi < 0) { |
cf68b80b | 521 | dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin)); |
1da177e4 | 522 | /* Interrupt Line values above 0xF are forbidden */ |
44f8e1a2 | 523 | if (dev->irq > 0 && (dev->irq <= 0xF)) { |
1da177e4 | 524 | printk(" - using IRQ %d\n", dev->irq); |
4be44fcd LB |
525 | acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, |
526 | ACPI_ACTIVE_LOW); | |
d550d98d | 527 | return 0; |
4be44fcd | 528 | } else { |
1da177e4 | 529 | printk("\n"); |
d550d98d | 530 | return 0; |
1da177e4 | 531 | } |
4be44fcd | 532 | } |
1da177e4 | 533 | |
c13f889a | 534 | rc = acpi_register_gsi(gsi, triggering, polarity); |
349f0d56 | 535 | if (rc < 0) { |
c83642d5 | 536 | dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n", |
cf68b80b | 537 | pin_name(pin)); |
d550d98d | 538 | return rc; |
349f0d56 KK |
539 | } |
540 | dev->irq = rc; | |
1da177e4 | 541 | |
1da177e4 | 542 | if (link) |
c83642d5 BH |
543 | snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); |
544 | else | |
545 | link_desc[0] = '\0'; | |
1da177e4 | 546 | |
c83642d5 | 547 | dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n", |
cf68b80b | 548 | pin_name(pin), link_desc, gsi, |
c83642d5 BH |
549 | (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", |
550 | (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); | |
1da177e4 | 551 | |
d550d98d | 552 | return 0; |
1da177e4 | 553 | } |
1da177e4 | 554 | |
87bec66b | 555 | /* FIXME: implement x86/x86_64 version */ |
4be44fcd LB |
556 | void __attribute__ ((weak)) acpi_unregister_gsi(u32 i) |
557 | { | |
558 | } | |
87bec66b | 559 | |
4be44fcd | 560 | void acpi_pci_irq_disable(struct pci_dev *dev) |
1da177e4 | 561 | { |
4be44fcd LB |
562 | int gsi = 0; |
563 | u8 pin = 0; | |
50eca3eb BM |
564 | int triggering = ACPI_LEVEL_SENSITIVE; |
565 | int polarity = ACPI_ACTIVE_LOW; | |
1da177e4 | 566 | |
1da177e4 | 567 | |
8015a014 | 568 | pin = dev->pin; |
1da177e4 | 569 | if (!pin) |
d550d98d | 570 | return; |
1da177e4 | 571 | |
1da177e4 LT |
572 | /* |
573 | * First we check the PCI IRQ routing table (PRT) for an IRQ. | |
574 | */ | |
063563b4 | 575 | gsi = acpi_pci_irq_lookup(dev, pin, |
50eca3eb | 576 | &triggering, &polarity, NULL, |
4be44fcd | 577 | acpi_pci_free_irq); |
1da177e4 LT |
578 | /* |
579 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
580 | * device's parent bridge. | |
581 | */ | |
582 | if (gsi < 0) | |
4be44fcd | 583 | gsi = acpi_pci_irq_derive(dev, pin, |
50eca3eb | 584 | &triggering, &polarity, NULL, |
4be44fcd | 585 | acpi_pci_free_irq); |
1da177e4 | 586 | if (gsi < 0) |
d550d98d | 587 | return; |
1da177e4 LT |
588 | |
589 | /* | |
590 | * TBD: It might be worth clearing dev->irq by magic constant | |
591 | * (e.g. PCI_UNDEFINED_IRQ). | |
592 | */ | |
593 | ||
cf68b80b | 594 | dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin)); |
1da177e4 | 595 | acpi_unregister_gsi(gsi); |
1da177e4 | 596 | } |