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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 | -------------------------------------------------------------------------- */ | |
272 | ||
273 | /* | |
274 | * acpi_pci_irq_lookup | |
275 | * success: return IRQ >= 0 | |
276 | * failure: return -1 | |
277 | */ | |
278 | static int | |
279 | acpi_pci_irq_lookup ( | |
280 | struct pci_bus *bus, | |
281 | int device, | |
282 | int pin, | |
283 | int *edge_level, | |
284 | int *active_high_low, | |
285 | char **link) | |
286 | { | |
287 | struct acpi_prt_entry *entry = NULL; | |
288 | int segment = pci_domain_nr(bus); | |
289 | int bus_nr = bus->number; | |
290 | int irq; | |
291 | ||
292 | ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup"); | |
293 | ||
294 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
295 | "Searching for PRT entry for %02x:%02x:%02x[%c]\n", | |
296 | segment, bus_nr, device, ('A' + pin))); | |
297 | ||
298 | entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); | |
299 | if (!entry) { | |
300 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n")); | |
301 | return_VALUE(-1); | |
302 | } | |
303 | ||
304 | if (entry->link.handle) { | |
305 | irq = acpi_pci_link_get_irq(entry->link.handle, | |
306 | entry->link.index, edge_level, active_high_low, link); | |
307 | if (irq < 0) { | |
308 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n")); | |
309 | return_VALUE(-1); | |
310 | } | |
311 | } else { | |
312 | irq = entry->link.index; | |
313 | *edge_level = ACPI_LEVEL_SENSITIVE; | |
314 | *active_high_low = ACPI_ACTIVE_LOW; | |
315 | } | |
316 | ||
317 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq)); | |
318 | ||
319 | return_VALUE(irq); | |
320 | } | |
321 | ||
322 | /* | |
323 | * acpi_pci_irq_derive | |
324 | * success: return IRQ >= 0 | |
325 | * failure: return < 0 | |
326 | */ | |
327 | static int | |
328 | acpi_pci_irq_derive ( | |
329 | struct pci_dev *dev, | |
330 | int pin, | |
331 | int *edge_level, | |
332 | int *active_high_low, | |
333 | char **link) | |
334 | { | |
335 | struct pci_dev *bridge = dev; | |
336 | int irq = -1; | |
337 | u8 bridge_pin = 0; | |
338 | ||
339 | ACPI_FUNCTION_TRACE("acpi_pci_irq_derive"); | |
340 | ||
341 | if (!dev) | |
342 | return_VALUE(-EINVAL); | |
343 | ||
344 | /* | |
345 | * Attempt to derive an IRQ for this device from a parent bridge's | |
346 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
347 | */ | |
348 | while (irq < 0 && bridge->bus->self) { | |
349 | pin = (pin + PCI_SLOT(bridge->devfn)) % 4; | |
350 | bridge = bridge->bus->self; | |
351 | ||
352 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
353 | /* PC card has the same IRQ as its cardbridge */ | |
354 | pci_read_config_byte(bridge, PCI_INTERRUPT_PIN, &bridge_pin); | |
355 | if (!bridge_pin) { | |
356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
357 | "No interrupt pin configured for device %s\n", pci_name(bridge))); | |
358 | return_VALUE(-1); | |
359 | } | |
360 | /* Pin is from 0 to 3 */ | |
361 | bridge_pin --; | |
362 | pin = bridge_pin; | |
363 | } | |
364 | ||
365 | irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), | |
366 | pin, edge_level, active_high_low, link); | |
367 | } | |
368 | ||
369 | if (irq < 0) { | |
370 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to derive IRQ for device %s\n", pci_name(dev))); | |
371 | return_VALUE(-1); | |
372 | } | |
373 | ||
374 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n", | |
375 | irq, pci_name(dev), pci_name(bridge))); | |
376 | ||
377 | return_VALUE(irq); | |
378 | } | |
379 | ||
380 | /* | |
381 | * acpi_pci_irq_enable | |
382 | * success: return 0 | |
383 | * failure: return < 0 | |
384 | */ | |
385 | ||
386 | int | |
387 | acpi_pci_irq_enable ( | |
388 | struct pci_dev *dev) | |
389 | { | |
390 | int irq = 0; | |
391 | u8 pin = 0; | |
392 | int edge_level = ACPI_LEVEL_SENSITIVE; | |
393 | int active_high_low = ACPI_ACTIVE_LOW; | |
394 | extern int via_interrupt_line_quirk; | |
395 | char *link = NULL; | |
396 | ||
397 | ACPI_FUNCTION_TRACE("acpi_pci_irq_enable"); | |
398 | ||
399 | if (!dev) | |
400 | return_VALUE(-EINVAL); | |
401 | ||
402 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); | |
403 | if (!pin) { | |
404 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No interrupt pin configured for device %s\n", pci_name(dev))); | |
405 | return_VALUE(0); | |
406 | } | |
407 | pin--; | |
408 | ||
409 | if (!dev->bus) { | |
410 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) 'bus' field\n")); | |
411 | return_VALUE(-ENODEV); | |
412 | } | |
413 | ||
414 | /* | |
415 | * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT | |
416 | * values override any BIOS-assigned IRQs set during boot. | |
417 | */ | |
418 | irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, | |
419 | &edge_level, &active_high_low, &link); | |
420 | ||
421 | /* | |
422 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
423 | * device's parent bridge. | |
424 | */ | |
425 | if (irq < 0) | |
426 | irq = acpi_pci_irq_derive(dev, pin, &edge_level, | |
427 | &active_high_low, &link); | |
428 | ||
429 | /* | |
430 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
431 | * driver reported one, then use it. Exit in any case. | |
432 | */ | |
433 | if (irq < 0) { | |
434 | printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI", | |
435 | pci_name(dev), ('A' + pin)); | |
436 | /* Interrupt Line values above 0xF are forbidden */ | |
437 | if (dev->irq >= 0 && (dev->irq <= 0xF)) { | |
438 | printk(" - using IRQ %d\n", dev->irq); | |
439 | return_VALUE(0); | |
440 | } | |
441 | else { | |
442 | printk("\n"); | |
443 | return_VALUE(0); | |
444 | } | |
445 | } | |
446 | ||
447 | if (via_interrupt_line_quirk) | |
448 | pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq & 15); | |
449 | ||
450 | dev->irq = acpi_register_gsi(irq, edge_level, active_high_low); | |
451 | ||
452 | printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ", | |
453 | pci_name(dev), 'A' + pin); | |
454 | ||
455 | if (link) | |
456 | printk("Link [%s] -> ", link); | |
457 | ||
458 | printk("GSI %u (%s, %s) -> IRQ %d\n", irq, | |
459 | (edge_level == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", | |
460 | (active_high_low == ACPI_ACTIVE_LOW) ? "low" : "high", | |
461 | dev->irq); | |
462 | ||
463 | return_VALUE(0); | |
464 | } | |
465 | EXPORT_SYMBOL(acpi_pci_irq_enable); | |
466 | ||
467 | ||
468 | #ifdef CONFIG_ACPI_DEALLOCATE_IRQ | |
469 | void | |
470 | acpi_pci_irq_disable ( | |
471 | struct pci_dev *dev) | |
472 | { | |
473 | int gsi = 0; | |
474 | u8 pin = 0; | |
475 | int edge_level = ACPI_LEVEL_SENSITIVE; | |
476 | int active_high_low = ACPI_ACTIVE_LOW; | |
477 | ||
478 | ACPI_FUNCTION_TRACE("acpi_pci_irq_disable"); | |
479 | ||
480 | if (!dev) | |
481 | return_VOID; | |
482 | ||
483 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); | |
484 | if (!pin) | |
485 | return_VOID; | |
486 | pin--; | |
487 | ||
488 | if (!dev->bus) | |
489 | return_VOID; | |
490 | ||
491 | /* | |
492 | * First we check the PCI IRQ routing table (PRT) for an IRQ. | |
493 | */ | |
494 | gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, | |
495 | &edge_level, &active_high_low, NULL); | |
496 | /* | |
497 | * If no PRT entry was found, we'll try to derive an IRQ from the | |
498 | * device's parent bridge. | |
499 | */ | |
500 | if (gsi < 0) | |
501 | gsi = acpi_pci_irq_derive(dev, pin, | |
502 | &edge_level, &active_high_low, NULL); | |
503 | if (gsi < 0) | |
504 | return_VOID; | |
505 | ||
506 | /* | |
507 | * TBD: It might be worth clearing dev->irq by magic constant | |
508 | * (e.g. PCI_UNDEFINED_IRQ). | |
509 | */ | |
510 | ||
511 | printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n", | |
512 | pci_name(dev)); | |
513 | ||
514 | acpi_unregister_gsi(gsi); | |
515 | ||
516 | return_VOID; | |
517 | } | |
518 | #endif /* CONFIG_ACPI_DEALLOCATE_IRQ */ |