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 /* --------------------------------------------------------------------------
64 PCI IRQ Routing Table (PRT) Support
65 -------------------------------------------------------------------------- */
67 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
71 struct acpi_prt_entry *entry = NULL;
77 * Parse through all PRT entries looking for a match on the specified
78 * PCI device's segment, bus, device, and pin (don't care about func).
81 spin_lock(&acpi_prt_lock);
82 list_for_each_entry(entry, &acpi_prt.entries, node) {
83 if ((segment == entry->id.segment)
84 && (bus == entry->id.bus)
85 && (device == entry->id.device)
86 && (pin == entry->pin)) {
87 spin_unlock(&acpi_prt_lock);
92 spin_unlock(&acpi_prt_lock);
96 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
97 static struct dmi_system_id medion_md9580[] = {
99 .ident = "Medion MD9580-F laptop",
101 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
102 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
108 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
109 static struct dmi_system_id dell_optiplex[] = {
111 .ident = "Dell Optiplex GX1",
113 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
114 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
120 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
121 static struct dmi_system_id hp_t5710[] = {
125 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
126 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
127 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
134 struct dmi_system_id *system;
135 unsigned int segment;
139 char *source; /* according to BIOS */
144 * These systems have incorrect _PRT entries. The BIOS claims the PCI
145 * interrupt at the listed segment/bus/device/pin is connected to the first
146 * link device, but it is actually connected to the second.
148 static struct prt_quirk prt_quirks[] = {
149 { medion_md9580, 0, 0, 9, 'A',
150 "\\_SB_.PCI0.ISA_.LNKA",
151 "\\_SB_.PCI0.ISA_.LNKB"},
152 { dell_optiplex, 0, 0, 0xd, 'A',
155 { hp_t5710, 0, 0, 1, 'A',
161 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
164 struct prt_quirk *quirk;
166 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
167 quirk = &prt_quirks[i];
169 /* All current quirks involve link devices, not GSIs */
173 if (dmi_check_system(quirk->system) &&
174 entry->id.segment == quirk->segment &&
175 entry->id.bus == quirk->bus &&
176 entry->id.device == quirk->device &&
177 entry->pin + 'A' == quirk->pin &&
178 !strcmp(prt->source, quirk->source) &&
179 strlen(prt->source) >= strlen(quirk->actual_source)) {
180 printk(KERN_WARNING PREFIX "firmware reports "
181 "%04x:%02x:%02x PCI INT %c connected to %s; "
183 entry->id.segment, entry->id.bus,
184 entry->id.device, 'A' + entry->pin,
185 prt->source, quirk->actual_source);
186 strcpy(prt->source, quirk->actual_source);
192 acpi_pci_irq_add_entry(acpi_handle handle,
193 int segment, int bus, struct acpi_pci_routing_table *prt)
195 struct acpi_prt_entry *entry = NULL;
197 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
201 entry->id.segment = segment;
203 entry->id.device = (prt->address >> 16) & 0xFFFF;
204 entry->pin = prt->pin;
206 do_prt_fixups(entry, prt);
211 * The 'source' field specifies the PCI interrupt link device used to
212 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
213 * indicates which resource descriptor in the resource template (of
214 * the link device) this interrupt is allocated from.
216 * NOTE: Don't query the Link Device for IRQ information at this time
217 * because Link Device enumeration may not have occurred yet
218 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
221 if (prt->source[0]) {
222 acpi_get_handle(handle, prt->source, &entry->link.handle);
223 entry->link.index = prt->source_index;
228 * The 'source' field is NULL, and the 'source_index' field specifies
229 * the IRQ value, which is hardwired to specific interrupt inputs on
230 * the interrupt controller.
233 entry->link.index = prt->source_index;
235 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
236 " %04x:%02x:%02x[%c] -> %s[%d]\n",
237 entry->id.segment, entry->id.bus,
238 entry->id.device, ('A' + entry->pin), prt->source,
241 spin_lock(&acpi_prt_lock);
242 list_add_tail(&entry->node, &acpi_prt.entries);
244 spin_unlock(&acpi_prt_lock);
250 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
252 if (segment == entry->id.segment && bus == entry->id.bus) {
254 list_del(&entry->node);
259 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
262 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
263 struct acpi_pci_routing_table *entry;
264 static int first_time = 1;
268 INIT_LIST_HEAD(&acpi_prt.entries);
272 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
273 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
274 if (ACPI_FAILURE(status))
277 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
278 (char *) buffer.pointer);
280 kfree(buffer.pointer);
282 buffer.length = ACPI_ALLOCATE_BUFFER;
283 buffer.pointer = NULL;
285 status = acpi_get_irq_routing_table(handle, &buffer);
286 if (ACPI_FAILURE(status)) {
287 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
288 acpi_format_exception(status)));
289 kfree(buffer.pointer);
293 entry = buffer.pointer;
294 while (entry && (entry->length > 0)) {
295 acpi_pci_irq_add_entry(handle, segment, bus, entry);
296 entry = (struct acpi_pci_routing_table *)
297 ((unsigned long)entry + entry->length);
300 kfree(buffer.pointer);
304 void acpi_pci_irq_del_prt(int segment, int bus)
306 struct list_head *node = NULL, *n = NULL;
307 struct acpi_prt_entry *entry = NULL;
309 if (!acpi_prt.count) {
314 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
316 spin_lock(&acpi_prt_lock);
317 list_for_each_safe(node, n, &acpi_prt.entries) {
318 entry = list_entry(node, struct acpi_prt_entry, node);
320 acpi_pci_irq_del_entry(segment, bus, entry);
322 spin_unlock(&acpi_prt_lock);
325 /* --------------------------------------------------------------------------
326 PCI Interrupt Routing Support
327 -------------------------------------------------------------------------- */
328 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
331 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
332 int *triggering, int *polarity, char **link)
337 if (entry->link.handle) {
338 irq = acpi_pci_link_allocate_irq(entry->link.handle,
339 entry->link.index, triggering,
342 printk(KERN_WARNING PREFIX
343 "Invalid IRQ link routing entry\n");
347 irq = entry->link.index;
348 *triggering = ACPI_LEVEL_SENSITIVE;
349 *polarity = ACPI_ACTIVE_LOW;
352 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq));
357 acpi_pci_free_irq(struct acpi_prt_entry *entry,
358 int *triggering, int *polarity, char **link)
362 if (entry->link.handle) {
363 irq = acpi_pci_link_free_irq(entry->link.handle);
365 irq = entry->link.index;
371 * acpi_pci_irq_lookup
372 * success: return IRQ >= 0
376 acpi_pci_irq_lookup(struct pci_bus *bus,
380 int *polarity, char **link, irq_lookup_func func)
382 struct acpi_prt_entry *entry = NULL;
383 int segment = pci_domain_nr(bus);
384 int bus_nr = bus->number;
388 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
389 "Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
390 segment, bus_nr, device, ('A' + pin)));
392 entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
394 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
398 ret = func(entry, triggering, polarity, link);
403 * acpi_pci_irq_derive
404 * success: return IRQ >= 0
405 * failure: return < 0
408 acpi_pci_irq_derive(struct pci_dev *dev,
411 int *polarity, char **link, irq_lookup_func func)
413 struct pci_dev *bridge = dev;
415 u8 bridge_pin = 0, orig_pin = pin;
419 * Attempt to derive an IRQ for this device from a parent bridge's
420 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
422 while (irq < 0 && bridge->bus->self) {
423 pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
424 bridge = bridge->bus->self;
426 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
427 /* PC card has the same IRQ as its cardbridge */
428 bridge_pin = bridge->pin;
430 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
431 "No interrupt pin configured for device %s\n",
435 /* Pin is from 0 to 3 */
440 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
441 pin, triggering, polarity,
446 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
451 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive GSI %d for device %s from %s\n",
452 irq, pci_name(dev), pci_name(bridge)));
458 * acpi_pci_irq_enable
460 * failure: return < 0
463 int acpi_pci_irq_enable(struct pci_dev *dev)
467 int triggering = ACPI_LEVEL_SENSITIVE;
468 int polarity = ACPI_ACTIVE_LOW;
476 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
477 "No interrupt pin configured for device %s\n",
484 * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
485 * values override any BIOS-assigned IRQs set during boot.
487 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
488 &triggering, &polarity, &link,
489 acpi_pci_allocate_irq);
492 * If no PRT entry was found, we'll try to derive an IRQ from the
493 * device's parent bridge.
496 gsi = acpi_pci_irq_derive(dev, pin, &triggering,
498 acpi_pci_allocate_irq);
502 * IDE legacy mode controller IRQs are magic. Why do compat
503 * extensions always make such a nasty mess.
505 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
506 (dev->class & 0x05) == 0)
510 * No IRQ known to the ACPI subsystem - maybe the BIOS /
511 * driver reported one, then use it. Exit in any case.
514 dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin);
515 /* Interrupt Line values above 0xF are forbidden */
516 if (dev->irq > 0 && (dev->irq <= 0xF)) {
517 printk(" - using IRQ %d\n", dev->irq);
518 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
527 rc = acpi_register_gsi(gsi, triggering, polarity);
529 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
536 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
540 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
541 'A' + pin, link_desc, gsi,
542 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
543 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
548 /* FIXME: implement x86/x86_64 version */
549 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
553 void acpi_pci_irq_disable(struct pci_dev *dev)
557 int triggering = ACPI_LEVEL_SENSITIVE;
558 int polarity = ACPI_ACTIVE_LOW;
567 * First we check the PCI IRQ routing table (PRT) for an IRQ.
569 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
570 &triggering, &polarity, NULL,
573 * If no PRT entry was found, we'll try to derive an IRQ from the
574 * device's parent bridge.
577 gsi = acpi_pci_irq_derive(dev, pin,
578 &triggering, &polarity, NULL,
584 * TBD: It might be worth clearing dev->irq by magic constant
585 * (e.g. PCI_UNDEFINED_IRQ).
588 dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin);
589 acpi_unregister_gsi(gsi);