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 static struct acpi_prt_list acpi_prt;
45 static DEFINE_SPINLOCK(acpi_prt_lock);
47 /* --------------------------------------------------------------------------
48 PCI IRQ Routing Table (PRT) Support
49 -------------------------------------------------------------------------- */
51 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
55 struct acpi_prt_entry *entry = NULL;
61 * Parse through all PRT entries looking for a match on the specified
62 * PCI device's segment, bus, device, and pin (don't care about func).
65 spin_lock(&acpi_prt_lock);
66 list_for_each_entry(entry, &acpi_prt.entries, node) {
67 if ((segment == entry->id.segment)
68 && (bus == entry->id.bus)
69 && (device == entry->id.device)
70 && (pin == entry->pin)) {
71 spin_unlock(&acpi_prt_lock);
76 spin_unlock(&acpi_prt_lock);
80 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
81 static struct dmi_system_id medion_md9580[] = {
83 .ident = "Medion MD9580-F laptop",
85 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
86 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
92 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
93 static struct dmi_system_id dell_optiplex[] = {
95 .ident = "Dell Optiplex GX1",
97 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
98 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
104 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
105 static struct dmi_system_id hp_t5710[] = {
109 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
110 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
111 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
118 struct dmi_system_id *system;
119 unsigned int segment;
123 char *source; /* according to BIOS */
128 * These systems have incorrect _PRT entries. The BIOS claims the PCI
129 * interrupt at the listed segment/bus/device/pin is connected to the first
130 * link device, but it is actually connected to the second.
132 static struct prt_quirk prt_quirks[] = {
133 { medion_md9580, 0, 0, 9, 'A',
134 "\\_SB_.PCI0.ISA_.LNKA",
135 "\\_SB_.PCI0.ISA_.LNKB"},
136 { dell_optiplex, 0, 0, 0xd, 'A',
139 { hp_t5710, 0, 0, 1, 'A',
145 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
148 struct prt_quirk *quirk;
150 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
151 quirk = &prt_quirks[i];
153 /* All current quirks involve link devices, not GSIs */
157 if (dmi_check_system(quirk->system) &&
158 entry->id.segment == quirk->segment &&
159 entry->id.bus == quirk->bus &&
160 entry->id.device == quirk->device &&
161 entry->pin + 'A' == quirk->pin &&
162 !strcmp(prt->source, quirk->source) &&
163 strlen(prt->source) >= strlen(quirk->actual_source)) {
164 printk(KERN_WARNING PREFIX "firmware reports "
165 "%04x:%02x:%02x PCI INT %c connected to %s; "
167 entry->id.segment, entry->id.bus,
168 entry->id.device, 'A' + entry->pin,
169 prt->source, quirk->actual_source);
170 strcpy(prt->source, quirk->actual_source);
176 acpi_pci_irq_add_entry(acpi_handle handle,
177 int segment, int bus, struct acpi_pci_routing_table *prt)
179 struct acpi_prt_entry *entry = NULL;
181 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
185 entry->id.segment = segment;
187 entry->id.device = (prt->address >> 16) & 0xFFFF;
188 entry->id.function = prt->address & 0xFFFF;
189 entry->pin = prt->pin;
191 do_prt_fixups(entry, prt);
196 * The 'source' field specifies the PCI interrupt link device used to
197 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
198 * indicates which resource descriptor in the resource template (of
199 * the link device) this interrupt is allocated from.
201 * NOTE: Don't query the Link Device for IRQ information at this time
202 * because Link Device enumeration may not have occurred yet
203 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
206 if (prt->source[0]) {
207 acpi_get_handle(handle, prt->source, &entry->link.handle);
208 entry->link.index = prt->source_index;
213 * The 'source' field is NULL, and the 'source_index' field specifies
214 * the IRQ value, which is hardwired to specific interrupt inputs on
215 * the interrupt controller.
218 entry->link.index = prt->source_index;
220 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
221 " %04x:%02x:%02x[%c] -> %s[%d]\n",
222 entry->id.segment, entry->id.bus,
223 entry->id.device, ('A' + entry->pin), prt->source,
226 spin_lock(&acpi_prt_lock);
227 list_add_tail(&entry->node, &acpi_prt.entries);
229 spin_unlock(&acpi_prt_lock);
235 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
237 if (segment == entry->id.segment && bus == entry->id.bus) {
239 list_del(&entry->node);
244 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
246 acpi_status status = AE_OK;
247 char *pathname = NULL;
248 struct acpi_buffer buffer = { 0, NULL };
249 struct acpi_pci_routing_table *prt = NULL;
250 struct acpi_pci_routing_table *entry = NULL;
251 static int first_time = 1;
254 pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
260 INIT_LIST_HEAD(&acpi_prt.entries);
265 * NOTE: We're given a 'handle' to the _PRT object's parent device
266 * (either a PCI root bridge or PCI-PCI bridge).
269 buffer.length = ACPI_PATHNAME_MAX;
270 buffer.pointer = pathname;
271 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
273 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
277 * Evaluate this _PRT and add its entries to our global list (acpi_prt).
281 buffer.pointer = NULL;
283 status = acpi_get_irq_routing_table(handle, &buffer);
284 if (status != AE_BUFFER_OVERFLOW) {
285 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
286 acpi_format_exception(status)));
290 prt = kzalloc(buffer.length, GFP_KERNEL);
294 buffer.pointer = prt;
296 status = acpi_get_irq_routing_table(handle, &buffer);
297 if (ACPI_FAILURE(status)) {
298 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
299 acpi_format_exception(status)));
300 kfree(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);
317 void acpi_pci_irq_del_prt(int segment, int bus)
319 struct list_head *node = NULL, *n = NULL;
320 struct acpi_prt_entry *entry = NULL;
322 if (!acpi_prt.count) {
327 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
329 spin_lock(&acpi_prt_lock);
330 list_for_each_safe(node, n, &acpi_prt.entries) {
331 entry = list_entry(node, struct acpi_prt_entry, node);
333 acpi_pci_irq_del_entry(segment, bus, entry);
335 spin_unlock(&acpi_prt_lock);
338 /* --------------------------------------------------------------------------
339 PCI Interrupt Routing Support
340 -------------------------------------------------------------------------- */
341 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
344 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
345 int *triggering, int *polarity, char **link)
350 if (entry->link.handle) {
351 irq = acpi_pci_link_allocate_irq(entry->link.handle,
352 entry->link.index, triggering,
355 printk(KERN_WARNING PREFIX
356 "Invalid IRQ link routing entry\n");
360 irq = entry->link.index;
361 *triggering = ACPI_LEVEL_SENSITIVE;
362 *polarity = ACPI_ACTIVE_LOW;
365 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
370 acpi_pci_free_irq(struct acpi_prt_entry *entry,
371 int *triggering, int *polarity, char **link)
375 if (entry->link.handle) {
376 irq = acpi_pci_link_free_irq(entry->link.handle);
378 irq = entry->link.index;
384 * acpi_pci_irq_lookup
385 * success: return IRQ >= 0
389 acpi_pci_irq_lookup(struct pci_bus *bus,
393 int *polarity, char **link, irq_lookup_func func)
395 struct acpi_prt_entry *entry = NULL;
396 int segment = pci_domain_nr(bus);
397 int bus_nr = bus->number;
401 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
402 "Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
403 segment, bus_nr, device, ('A' + pin)));
405 entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
411 ret = func(entry, triggering, polarity, link);
416 * acpi_pci_irq_derive
417 * success: return IRQ >= 0
418 * failure: return < 0
421 acpi_pci_irq_derive(struct pci_dev *dev,
424 int *polarity, char **link, irq_lookup_func func)
426 struct pci_dev *bridge = dev;
428 u8 bridge_pin = 0, orig_pin = pin;
432 * Attempt to derive an IRQ for this device from a parent bridge's
433 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
435 while (irq < 0 && bridge->bus->self) {
436 pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
437 bridge = bridge->bus->self;
439 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
440 /* PC card has the same IRQ as its cardbridge */
441 bridge_pin = bridge->pin;
443 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
444 "No interrupt pin configured for device %s\n",
448 /* Pin is from 0 to 3 */
453 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
454 pin, triggering, polarity,
459 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
464 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
465 irq, pci_name(dev), pci_name(bridge)));
471 * acpi_pci_irq_enable
473 * failure: return < 0
476 int acpi_pci_irq_enable(struct pci_dev *dev)
480 int triggering = ACPI_LEVEL_SENSITIVE;
481 int polarity = ACPI_ACTIVE_LOW;
489 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
490 "No interrupt pin configured for device %s\n",
497 * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
498 * values override any BIOS-assigned IRQs set during boot.
500 irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
501 &triggering, &polarity, &link,
502 acpi_pci_allocate_irq);
505 * If no PRT entry was found, we'll try to derive an IRQ from the
506 * device's parent bridge.
509 irq = acpi_pci_irq_derive(dev, pin, &triggering,
511 acpi_pci_allocate_irq);
515 * IDE legacy mode controller IRQs are magic. Why do compat
516 * extensions always make such a nasty mess.
518 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
519 (dev->class & 0x05) == 0)
523 * No IRQ known to the ACPI subsystem - maybe the BIOS /
524 * driver reported one, then use it. Exit in any case.
527 dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin);
528 /* Interrupt Line values above 0xF are forbidden */
529 if (dev->irq > 0 && (dev->irq <= 0xF)) {
530 printk(" - using IRQ %d\n", dev->irq);
531 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
540 rc = acpi_register_gsi(irq, triggering, polarity);
542 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
549 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
553 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
554 'A' + pin, link_desc, irq,
555 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
556 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
561 /* FIXME: implement x86/x86_64 version */
562 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
566 void acpi_pci_irq_disable(struct pci_dev *dev)
570 int triggering = ACPI_LEVEL_SENSITIVE;
571 int polarity = ACPI_ACTIVE_LOW;
580 * First we check the PCI IRQ routing table (PRT) for an IRQ.
582 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
583 &triggering, &polarity, NULL,
586 * If no PRT entry was found, we'll try to derive an IRQ from the
587 * device's parent bridge.
590 gsi = acpi_pci_irq_derive(dev, pin,
591 &triggering, &polarity, NULL,
597 * TBD: It might be worth clearing dev->irq by magic constant
598 * (e.g. PCI_UNDEFINED_IRQ).
601 dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin);
602 acpi_unregister_gsi(gsi);