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>
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;
55 struct acpi_prt_list {
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)
68 /* --------------------------------------------------------------------------
69 PCI IRQ Routing Table (PRT) Support
70 -------------------------------------------------------------------------- */
72 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
76 struct acpi_prt_entry *entry = NULL;
82 * Parse through all PRT entries looking for a match on the specified
83 * PCI device's segment, bus, device, and pin (don't care about func).
86 spin_lock(&acpi_prt_lock);
87 list_for_each_entry(entry, &acpi_prt.entries, node) {
88 if ((segment == entry->id.segment)
89 && (bus == entry->id.bus)
90 && (device == entry->id.device)
91 && (pin == entry->pin)) {
92 spin_unlock(&acpi_prt_lock);
97 spin_unlock(&acpi_prt_lock);
101 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
102 static struct dmi_system_id medion_md9580[] = {
104 .ident = "Medion MD9580-F laptop",
106 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
107 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
113 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
114 static struct dmi_system_id dell_optiplex[] = {
116 .ident = "Dell Optiplex GX1",
118 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
119 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
125 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
126 static struct dmi_system_id hp_t5710[] = {
130 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
131 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
132 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
139 struct dmi_system_id *system;
140 unsigned int segment;
144 char *source; /* according to BIOS */
149 * These systems have incorrect _PRT entries. The BIOS claims the PCI
150 * interrupt at the listed segment/bus/device/pin is connected to the first
151 * link device, but it is actually connected to the second.
153 static struct prt_quirk prt_quirks[] = {
154 { medion_md9580, 0, 0, 9, 'A',
155 "\\_SB_.PCI0.ISA_.LNKA",
156 "\\_SB_.PCI0.ISA_.LNKB"},
157 { dell_optiplex, 0, 0, 0xd, 'A',
160 { hp_t5710, 0, 0, 1, 'A',
166 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
169 struct prt_quirk *quirk;
171 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
172 quirk = &prt_quirks[i];
174 /* All current quirks involve link devices, not GSIs */
178 if (dmi_check_system(quirk->system) &&
179 entry->id.segment == quirk->segment &&
180 entry->id.bus == quirk->bus &&
181 entry->id.device == quirk->device &&
182 pin_name(entry->pin) == quirk->pin &&
183 !strcmp(prt->source, quirk->source) &&
184 strlen(prt->source) >= strlen(quirk->actual_source)) {
185 printk(KERN_WARNING PREFIX "firmware reports "
186 "%04x:%02x:%02x PCI INT %c connected to %s; "
188 entry->id.segment, entry->id.bus,
189 entry->id.device, pin_name(entry->pin),
190 prt->source, quirk->actual_source);
191 strcpy(prt->source, quirk->actual_source);
197 acpi_pci_irq_add_entry(acpi_handle handle,
198 int segment, int bus, struct acpi_pci_routing_table *prt)
200 struct acpi_prt_entry *entry = NULL;
202 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
207 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
208 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
211 entry->id.segment = segment;
213 entry->id.device = (prt->address >> 16) & 0xFFFF;
214 entry->pin = prt->pin + 1;
216 do_prt_fixups(entry, prt);
221 * The 'source' field specifies the PCI interrupt link device used to
222 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
223 * indicates which resource descriptor in the resource template (of
224 * the link device) this interrupt is allocated from.
226 * NOTE: Don't query the Link Device for IRQ information at this time
227 * because Link Device enumeration may not have occurred yet
228 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
231 if (prt->source[0]) {
232 acpi_get_handle(handle, prt->source, &entry->link.handle);
233 entry->link.index = prt->source_index;
238 * The 'source' field is NULL, and the 'source_index' field specifies
239 * the IRQ value, which is hardwired to specific interrupt inputs on
240 * the interrupt controller.
243 entry->link.index = prt->source_index;
245 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
246 " %04x:%02x:%02x[%c] -> %s[%d]\n",
247 entry->id.segment, entry->id.bus,
248 entry->id.device, pin_name(entry->pin),
249 prt->source, entry->link.index));
251 spin_lock(&acpi_prt_lock);
252 list_add_tail(&entry->node, &acpi_prt.entries);
254 spin_unlock(&acpi_prt_lock);
260 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
262 if (segment == entry->id.segment && bus == entry->id.bus) {
264 list_del(&entry->node);
269 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
272 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
273 struct acpi_pci_routing_table *entry;
274 static int first_time = 1;
278 INIT_LIST_HEAD(&acpi_prt.entries);
282 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
283 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
284 if (ACPI_FAILURE(status))
287 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
288 (char *) buffer.pointer);
290 kfree(buffer.pointer);
292 buffer.length = ACPI_ALLOCATE_BUFFER;
293 buffer.pointer = NULL;
295 status = acpi_get_irq_routing_table(handle, &buffer);
296 if (ACPI_FAILURE(status)) {
297 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
298 acpi_format_exception(status)));
299 kfree(buffer.pointer);
303 entry = buffer.pointer;
304 while (entry && (entry->length > 0)) {
305 acpi_pci_irq_add_entry(handle, segment, bus, entry);
306 entry = (struct acpi_pci_routing_table *)
307 ((unsigned long)entry + entry->length);
310 kfree(buffer.pointer);
314 void acpi_pci_irq_del_prt(int segment, int bus)
316 struct list_head *node = NULL, *n = NULL;
317 struct acpi_prt_entry *entry = NULL;
319 if (!acpi_prt.count) {
324 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
326 spin_lock(&acpi_prt_lock);
327 list_for_each_safe(node, n, &acpi_prt.entries) {
328 entry = list_entry(node, struct acpi_prt_entry, node);
330 acpi_pci_irq_del_entry(segment, bus, entry);
332 spin_unlock(&acpi_prt_lock);
335 /* --------------------------------------------------------------------------
336 PCI Interrupt Routing Support
337 -------------------------------------------------------------------------- */
338 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
341 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
342 int *triggering, int *polarity, char **link)
347 if (entry->link.handle) {
348 irq = acpi_pci_link_allocate_irq(entry->link.handle,
349 entry->link.index, triggering,
352 printk(KERN_WARNING PREFIX
353 "Invalid IRQ link routing entry\n");
357 irq = entry->link.index;
358 *triggering = ACPI_LEVEL_SENSITIVE;
359 *polarity = ACPI_ACTIVE_LOW;
362 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq));
367 acpi_pci_free_irq(struct acpi_prt_entry *entry,
368 int *triggering, int *polarity, char **link)
372 if (entry->link.handle) {
373 irq = acpi_pci_link_free_irq(entry->link.handle);
375 irq = entry->link.index;
381 * acpi_pci_irq_lookup
382 * success: return IRQ >= 0
386 acpi_pci_irq_lookup(struct pci_bus *bus,
390 int *polarity, char **link, irq_lookup_func func)
392 struct acpi_prt_entry *entry = NULL;
393 int segment = pci_domain_nr(bus);
394 int bus_nr = bus->number;
398 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
399 "Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
400 segment, bus_nr, device, pin_name(pin)));
402 entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
408 ret = func(entry, triggering, polarity, link);
413 * acpi_pci_irq_derive
414 * success: return IRQ >= 0
415 * failure: return < 0
418 acpi_pci_irq_derive(struct pci_dev *dev,
421 int *polarity, char **link, irq_lookup_func func)
423 struct pci_dev *bridge = dev;
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;
440 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
441 "No interrupt pin configured for device %s\n",
448 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
449 pin, triggering, polarity,
454 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
459 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive GSI %d for device %s from %s\n",
460 irq, pci_name(dev), pci_name(bridge)));
466 * acpi_pci_irq_enable
468 * failure: return < 0
471 int acpi_pci_irq_enable(struct pci_dev *dev)
475 int triggering = ACPI_LEVEL_SENSITIVE;
476 int polarity = ACPI_ACTIVE_LOW;
484 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
485 "No interrupt pin configured for device %s\n",
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->bus, PCI_SLOT(dev->devfn), 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.
503 gsi = acpi_pci_irq_derive(dev, pin, &triggering,
505 acpi_pci_allocate_irq);
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)
517 * No IRQ known to the ACPI subsystem - maybe the BIOS /
518 * driver reported one, then use it. Exit in any case.
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,
534 rc = acpi_register_gsi(gsi, triggering, polarity);
536 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
543 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
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);
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)
564 int triggering = ACPI_LEVEL_SENSITIVE;
565 int polarity = ACPI_ACTIVE_LOW;
573 * First we check the PCI IRQ routing table (PRT) for an IRQ.
575 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
576 &triggering, &polarity, NULL,
579 * If no PRT entry was found, we'll try to derive an IRQ from the
580 * device's parent bridge.
583 gsi = acpi_pci_irq_derive(dev, pin,
584 &triggering, &polarity, NULL,
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);