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 */
148 #define PCI_INTX_PIN(c) (c - 'A' + 1)
151 * These systems have incorrect _PRT entries. The BIOS claims the PCI
152 * interrupt at the listed segment/bus/device/pin is connected to the first
153 * link device, but it is actually connected to the second.
155 static struct prt_quirk prt_quirks[] = {
156 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
157 "\\_SB_.PCI0.ISA_.LNKA",
158 "\\_SB_.PCI0.ISA_.LNKB"},
159 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
162 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
168 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
171 struct prt_quirk *quirk;
173 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
174 quirk = &prt_quirks[i];
176 /* All current quirks involve link devices, not GSIs */
180 if (dmi_check_system(quirk->system) &&
181 entry->id.segment == quirk->segment &&
182 entry->id.bus == quirk->bus &&
183 entry->id.device == quirk->device &&
184 entry->pin == quirk->pin &&
185 !strcmp(prt->source, quirk->source) &&
186 strlen(prt->source) >= strlen(quirk->actual_source)) {
187 printk(KERN_WARNING PREFIX "firmware reports "
188 "%04x:%02x:%02x PCI INT %c connected to %s; "
190 entry->id.segment, entry->id.bus,
191 entry->id.device, pin_name(entry->pin),
192 prt->source, quirk->actual_source);
193 strcpy(prt->source, quirk->actual_source);
199 acpi_pci_irq_add_entry(acpi_handle handle,
200 int segment, int bus, struct acpi_pci_routing_table *prt)
202 struct acpi_prt_entry *entry = NULL;
204 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
209 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
210 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
213 entry->id.segment = segment;
215 entry->id.device = (prt->address >> 16) & 0xFFFF;
216 entry->pin = prt->pin + 1;
218 do_prt_fixups(entry, prt);
223 * The 'source' field specifies the PCI interrupt link device used to
224 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
225 * indicates which resource descriptor in the resource template (of
226 * the link device) this interrupt is allocated from.
228 * NOTE: Don't query the Link Device for IRQ information at this time
229 * because Link Device enumeration may not have occurred yet
230 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
233 if (prt->source[0]) {
234 acpi_get_handle(handle, prt->source, &entry->link.handle);
235 entry->link.index = prt->source_index;
240 * The 'source' field is NULL, and the 'source_index' field specifies
241 * the IRQ value, which is hardwired to specific interrupt inputs on
242 * the interrupt controller.
245 entry->link.index = prt->source_index;
247 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
248 " %04x:%02x:%02x[%c] -> %s[%d]\n",
249 entry->id.segment, entry->id.bus,
250 entry->id.device, pin_name(entry->pin),
251 prt->source, entry->link.index));
253 spin_lock(&acpi_prt_lock);
254 list_add_tail(&entry->node, &acpi_prt.entries);
256 spin_unlock(&acpi_prt_lock);
262 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
264 if (segment == entry->id.segment && bus == entry->id.bus) {
266 list_del(&entry->node);
271 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
274 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
275 struct acpi_pci_routing_table *entry;
276 static int first_time = 1;
280 INIT_LIST_HEAD(&acpi_prt.entries);
284 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
285 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
286 if (ACPI_FAILURE(status))
289 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
290 (char *) buffer.pointer);
292 kfree(buffer.pointer);
294 buffer.length = ACPI_ALLOCATE_BUFFER;
295 buffer.pointer = NULL;
297 status = acpi_get_irq_routing_table(handle, &buffer);
298 if (ACPI_FAILURE(status)) {
299 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
300 acpi_format_exception(status)));
301 kfree(buffer.pointer);
305 entry = buffer.pointer;
306 while (entry && (entry->length > 0)) {
307 acpi_pci_irq_add_entry(handle, segment, bus, entry);
308 entry = (struct acpi_pci_routing_table *)
309 ((unsigned long)entry + entry->length);
312 kfree(buffer.pointer);
316 void acpi_pci_irq_del_prt(int segment, int bus)
318 struct list_head *node = NULL, *n = NULL;
319 struct acpi_prt_entry *entry = NULL;
321 if (!acpi_prt.count) {
326 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
328 spin_lock(&acpi_prt_lock);
329 list_for_each_safe(node, n, &acpi_prt.entries) {
330 entry = list_entry(node, struct acpi_prt_entry, node);
332 acpi_pci_irq_del_entry(segment, bus, entry);
334 spin_unlock(&acpi_prt_lock);
337 /* --------------------------------------------------------------------------
338 PCI Interrupt Routing Support
339 -------------------------------------------------------------------------- */
340 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
343 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
344 int *triggering, int *polarity, char **link)
349 if (entry->link.handle) {
350 irq = acpi_pci_link_allocate_irq(entry->link.handle,
351 entry->link.index, triggering,
354 printk(KERN_WARNING PREFIX
355 "Invalid IRQ link routing entry\n");
359 irq = entry->link.index;
360 *triggering = ACPI_LEVEL_SENSITIVE;
361 *polarity = ACPI_ACTIVE_LOW;
364 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq));
369 acpi_pci_free_irq(struct acpi_prt_entry *entry,
370 int *triggering, int *polarity, char **link)
374 if (entry->link.handle) {
375 irq = acpi_pci_link_free_irq(entry->link.handle);
377 irq = entry->link.index;
383 * acpi_pci_irq_lookup
384 * success: return IRQ >= 0
388 acpi_pci_irq_lookup(struct pci_bus *bus,
392 int *polarity, char **link, irq_lookup_func func)
394 struct acpi_prt_entry *entry = NULL;
395 int segment = pci_domain_nr(bus);
396 int bus_nr = bus->number;
400 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
401 "Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
402 segment, bus_nr, device, pin_name(pin)));
404 entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
406 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
410 ret = func(entry, triggering, polarity, link);
415 * acpi_pci_irq_derive
416 * success: return IRQ >= 0
417 * failure: return < 0
420 acpi_pci_irq_derive(struct pci_dev *dev,
423 int *polarity, char **link, irq_lookup_func func)
425 struct pci_dev *bridge = dev;
427 u8 bridge_pin = 0, orig_pin = pin;
431 * Attempt to derive an IRQ for this device from a parent bridge's
432 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
434 while (irq < 0 && bridge->bus->self) {
435 pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;
436 bridge = bridge->bus->self;
438 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
439 /* PC card has the same IRQ as its cardbridge */
440 bridge_pin = bridge->pin;
442 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
443 "No interrupt pin configured for device %s\n",
450 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
451 pin, triggering, polarity,
456 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
461 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive GSI %d for device %s from %s\n",
462 irq, pci_name(dev), pci_name(bridge)));
468 * acpi_pci_irq_enable
470 * failure: return < 0
473 int acpi_pci_irq_enable(struct pci_dev *dev)
477 int triggering = ACPI_LEVEL_SENSITIVE;
478 int polarity = ACPI_ACTIVE_LOW;
486 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
487 "No interrupt pin configured for device %s\n",
493 * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
494 * values override any BIOS-assigned IRQs set during boot.
496 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
497 &triggering, &polarity, &link,
498 acpi_pci_allocate_irq);
501 * If no PRT entry was found, we'll try to derive an IRQ from the
502 * device's parent bridge.
505 gsi = acpi_pci_irq_derive(dev, pin, &triggering,
507 acpi_pci_allocate_irq);
511 * IDE legacy mode controller IRQs are magic. Why do compat
512 * extensions always make such a nasty mess.
514 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
515 (dev->class & 0x05) == 0)
519 * No IRQ known to the ACPI subsystem - maybe the BIOS /
520 * driver reported one, then use it. Exit in any case.
523 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
524 /* Interrupt Line values above 0xF are forbidden */
525 if (dev->irq > 0 && (dev->irq <= 0xF)) {
526 printk(" - using IRQ %d\n", dev->irq);
527 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
536 rc = acpi_register_gsi(gsi, triggering, polarity);
538 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
545 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
549 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
550 pin_name(pin), link_desc, gsi,
551 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
552 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
557 /* FIXME: implement x86/x86_64 version */
558 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
562 void acpi_pci_irq_disable(struct pci_dev *dev)
566 int triggering = ACPI_LEVEL_SENSITIVE;
567 int polarity = ACPI_ACTIVE_LOW;
575 * First we check the PCI IRQ routing table (PRT) for an IRQ.
577 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
578 &triggering, &polarity, NULL,
581 * If no PRT entry was found, we'll try to derive an IRQ from the
582 * device's parent bridge.
585 gsi = acpi_pci_irq_derive(dev, pin,
586 &triggering, &polarity, NULL,
592 * TBD: It might be worth clearing dev->irq by magic constant
593 * (e.g. PCI_UNDEFINED_IRQ).
596 dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
597 acpi_unregister_gsi(gsi);