ACPI: PCI: tweak _PRT lookup debug
[linux-2.6/mini2440.git] / drivers / acpi / pci_irq.c
blob7978c97afb0a7eaba267ab7ca32b3aa61a4274b5
1 /*
2 * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
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>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 #include <linux/dmi.h>
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>
41 #define _COMPONENT ACPI_PCI_COMPONENT
42 ACPI_MODULE_NAME("pci_irq");
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;
55 struct acpi_prt_list {
56 int count;
57 struct list_head entries;
60 static struct acpi_prt_list acpi_prt;
61 static DEFINE_SPINLOCK(acpi_prt_lock);
63 static inline char pin_name(int pin)
65 return 'A' + pin - 1;
68 /* --------------------------------------------------------------------------
69 PCI IRQ Routing Table (PRT) Support
70 -------------------------------------------------------------------------- */
72 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
73 int pin)
75 struct acpi_prt_entry *entry = NULL;
76 int segment = pci_domain_nr(dev->bus);
77 int bus = dev->bus->number;
78 int device = PCI_SLOT(dev->devfn);
80 if (!acpi_prt.count)
81 return NULL;
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).
88 spin_lock(&acpi_prt_lock);
89 list_for_each_entry(entry, &acpi_prt.entries, node) {
90 if ((segment == entry->id.segment)
91 && (bus == entry->id.bus)
92 && (device == entry->id.device)
93 && (pin == entry->pin)) {
94 spin_unlock(&acpi_prt_lock);
95 return entry;
99 spin_unlock(&acpi_prt_lock);
100 return NULL;
103 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
104 static struct dmi_system_id medion_md9580[] = {
106 .ident = "Medion MD9580-F laptop",
107 .matches = {
108 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
109 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
115 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
116 static struct dmi_system_id dell_optiplex[] = {
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+"),
127 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
128 static struct dmi_system_id hp_t5710[] = {
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"),
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;
150 #define PCI_INTX_PIN(c) (c - 'A' + 1)
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.
157 static struct prt_quirk prt_quirks[] = {
158 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
159 "\\_SB_.PCI0.ISA_.LNKA",
160 "\\_SB_.PCI0.ISA_.LNKB"},
161 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
162 "\\_SB_.LNKB",
163 "\\_SB_.LNKA"},
164 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
165 "\\_SB_.PCI0.LNK1",
166 "\\_SB_.PCI0.LNK3"},
169 static void
170 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
172 int i;
173 struct prt_quirk *quirk;
175 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
176 quirk = &prt_quirks[i];
178 /* All current quirks involve link devices, not GSIs */
179 if (!prt->source)
180 continue;
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 &&
186 entry->pin == quirk->pin &&
187 !strcmp(prt->source, quirk->source) &&
188 strlen(prt->source) >= strlen(quirk->actual_source)) {
189 printk(KERN_WARNING PREFIX "firmware reports "
190 "%04x:%02x:%02x PCI INT %c connected to %s; "
191 "changing to %s\n",
192 entry->id.segment, entry->id.bus,
193 entry->id.device, pin_name(entry->pin),
194 prt->source, quirk->actual_source);
195 strcpy(prt->source, quirk->actual_source);
200 static int
201 acpi_pci_irq_add_entry(acpi_handle handle,
202 int segment, int bus, struct acpi_pci_routing_table *prt)
204 struct acpi_prt_entry *entry = NULL;
206 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
207 if (!entry)
208 return -ENOMEM;
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.
215 entry->id.segment = segment;
216 entry->id.bus = bus;
217 entry->id.device = (prt->address >> 16) & 0xFFFF;
218 entry->pin = prt->pin + 1;
220 do_prt_fixups(entry, prt);
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.
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).
235 if (prt->source[0]) {
236 acpi_get_handle(handle, prt->source, &entry->link.handle);
237 entry->link.index = prt->source_index;
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.
246 else
247 entry->link.index = prt->source_index;
249 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
250 " %04x:%02x:%02x[%c] -> %s[%d]\n",
251 entry->id.segment, entry->id.bus,
252 entry->id.device, pin_name(entry->pin),
253 prt->source, entry->link.index));
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);
260 return 0;
263 static void
264 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
266 if (segment == entry->id.segment && bus == entry->id.bus) {
267 acpi_prt.count--;
268 list_del(&entry->node);
269 kfree(entry);
273 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
275 acpi_status status;
276 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
277 struct acpi_pci_routing_table *entry;
278 static int first_time = 1;
280 if (first_time) {
281 acpi_prt.count = 0;
282 INIT_LIST_HEAD(&acpi_prt.entries);
283 first_time = 0;
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;
291 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
292 (char *) buffer.pointer);
294 kfree(buffer.pointer);
296 buffer.length = ACPI_ALLOCATE_BUFFER;
297 buffer.pointer = NULL;
299 status = acpi_get_irq_routing_table(handle, &buffer);
300 if (ACPI_FAILURE(status)) {
301 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
302 acpi_format_exception(status)));
303 kfree(buffer.pointer);
304 return -ENODEV;
307 entry = buffer.pointer;
308 while (entry && (entry->length > 0)) {
309 acpi_pci_irq_add_entry(handle, segment, bus, entry);
310 entry = (struct acpi_pci_routing_table *)
311 ((unsigned long)entry + entry->length);
314 kfree(buffer.pointer);
315 return 0;
318 void acpi_pci_irq_del_prt(int segment, int bus)
320 struct list_head *node = NULL, *n = NULL;
321 struct acpi_prt_entry *entry = NULL;
323 if (!acpi_prt.count) {
324 return;
327 printk(KERN_DEBUG
328 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
329 segment, bus);
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);
334 acpi_pci_irq_del_entry(segment, bus, entry);
336 spin_unlock(&acpi_prt_lock);
339 /* --------------------------------------------------------------------------
340 PCI Interrupt Routing Support
341 -------------------------------------------------------------------------- */
342 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
344 static int
345 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
346 int *triggering, int *polarity, char **link)
348 int irq;
351 if (entry->link.handle) {
352 irq = acpi_pci_link_allocate_irq(entry->link.handle,
353 entry->link.index, triggering,
354 polarity, link);
355 if (irq < 0) {
356 printk(KERN_WARNING PREFIX
357 "Invalid IRQ link routing entry\n");
358 return -1;
360 } else {
361 irq = entry->link.index;
362 *triggering = ACPI_LEVEL_SENSITIVE;
363 *polarity = ACPI_ACTIVE_LOW;
366 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq));
367 return irq;
370 static int
371 acpi_pci_free_irq(struct acpi_prt_entry *entry,
372 int *triggering, int *polarity, char **link)
374 int irq;
376 if (entry->link.handle) {
377 irq = acpi_pci_link_free_irq(entry->link.handle);
378 } else {
379 irq = entry->link.index;
381 return irq;
385 * acpi_pci_irq_lookup
386 * success: return IRQ >= 0
387 * failure: return -1
389 static int
390 acpi_pci_irq_lookup(struct pci_dev *dev, int pin,
391 int *triggering,
392 int *polarity, char **link, irq_lookup_func func)
394 struct acpi_prt_entry *entry = NULL;
395 int ret;
398 entry = acpi_pci_irq_find_prt_entry(dev, pin);
399 if (!entry) {
400 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No %s[%c] _PRT entry\n",
401 pci_name(dev), pin_name(pin)));
402 return -1;
405 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
406 pci_name(dev), pin_name(pin)));
408 ret = func(entry, triggering, polarity, link);
409 return ret;
413 * acpi_pci_irq_derive
414 * success: return IRQ >= 0
415 * failure: return < 0
417 static int
418 acpi_pci_irq_derive(struct pci_dev *dev,
419 int pin,
420 int *triggering,
421 int *polarity, char **link, irq_lookup_func func)
423 struct pci_dev *bridge = dev;
424 int irq = -1;
425 u8 bridge_pin = 0, orig_pin = pin;
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).
432 while (irq < 0 && bridge->bus->self) {
433 pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;
434 bridge = bridge->bus->self;
436 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
437 /* PC card has the same IRQ as its cardbridge */
438 bridge_pin = bridge->pin;
439 if (!bridge_pin) {
440 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
441 "No interrupt pin configured for device %s\n",
442 pci_name(bridge)));
443 return -1;
445 pin = bridge_pin;
448 irq = acpi_pci_irq_lookup(bridge,
449 pin, triggering, polarity,
450 link, func);
453 if (irq < 0) {
454 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
455 pin_name(orig_pin));
456 return -1;
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)));
462 return irq;
466 * acpi_pci_irq_enable
467 * success: return 0
468 * failure: return < 0
471 int acpi_pci_irq_enable(struct pci_dev *dev)
473 int gsi = 0;
474 u8 pin = 0;
475 int triggering = ACPI_LEVEL_SENSITIVE;
476 int polarity = ACPI_ACTIVE_LOW;
477 char *link = NULL;
478 char link_desc[16];
479 int rc;
482 pin = dev->pin;
483 if (!pin) {
484 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
485 "No interrupt pin configured for device %s\n",
486 pci_name(dev)));
487 return 0;
491 * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
492 * values override any BIOS-assigned IRQs set during boot.
494 gsi = acpi_pci_irq_lookup(dev, pin,
495 &triggering, &polarity, &link,
496 acpi_pci_allocate_irq);
499 * If no PRT entry was found, we'll try to derive an IRQ from the
500 * device's parent bridge.
502 if (gsi < 0)
503 gsi = acpi_pci_irq_derive(dev, pin, &triggering,
504 &polarity, &link,
505 acpi_pci_allocate_irq);
507 if (gsi < 0) {
509 * IDE legacy mode controller IRQs are magic. Why do compat
510 * extensions always make such a nasty mess.
512 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
513 (dev->class & 0x05) == 0)
514 return 0;
517 * No IRQ known to the ACPI subsystem - maybe the BIOS /
518 * driver reported one, then use it. Exit in any case.
520 if (gsi < 0) {
521 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
522 /* Interrupt Line values above 0xF are forbidden */
523 if (dev->irq > 0 && (dev->irq <= 0xF)) {
524 printk(" - using IRQ %d\n", dev->irq);
525 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
526 ACPI_ACTIVE_LOW);
527 return 0;
528 } else {
529 printk("\n");
530 return 0;
534 rc = acpi_register_gsi(gsi, triggering, polarity);
535 if (rc < 0) {
536 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
537 pin_name(pin));
538 return rc;
540 dev->irq = rc;
542 if (link)
543 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
544 else
545 link_desc[0] = '\0';
547 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
548 pin_name(pin), link_desc, gsi,
549 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
550 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
552 return 0;
555 /* FIXME: implement x86/x86_64 version */
556 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
560 void acpi_pci_irq_disable(struct pci_dev *dev)
562 int gsi = 0;
563 u8 pin = 0;
564 int triggering = ACPI_LEVEL_SENSITIVE;
565 int polarity = ACPI_ACTIVE_LOW;
568 pin = dev->pin;
569 if (!pin)
570 return;
573 * First we check the PCI IRQ routing table (PRT) for an IRQ.
575 gsi = acpi_pci_irq_lookup(dev, pin,
576 &triggering, &polarity, NULL,
577 acpi_pci_free_irq);
579 * If no PRT entry was found, we'll try to derive an IRQ from the
580 * device's parent bridge.
582 if (gsi < 0)
583 gsi = acpi_pci_irq_derive(dev, pin,
584 &triggering, &polarity, NULL,
585 acpi_pci_free_irq);
586 if (gsi < 0)
587 return;
590 * TBD: It might be worth clearing dev->irq by magic constant
591 * (e.g. PCI_UNDEFINED_IRQ).
594 dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
595 acpi_unregister_gsi(gsi);