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 list
;
46 struct acpi_pci_id id
;
55 static LIST_HEAD(acpi_prt_list
);
56 static DEFINE_SPINLOCK(acpi_prt_lock
);
58 static inline char pin_name(int pin
)
63 /* --------------------------------------------------------------------------
64 PCI IRQ Routing Table (PRT) Support
65 -------------------------------------------------------------------------- */
67 static struct acpi_prt_entry
*acpi_pci_irq_find_prt_entry(struct pci_dev
*dev
,
70 struct acpi_prt_entry
*entry
;
71 int segment
= pci_domain_nr(dev
->bus
);
72 int bus
= dev
->bus
->number
;
73 int device
= PCI_SLOT(dev
->devfn
);
75 spin_lock(&acpi_prt_lock
);
76 list_for_each_entry(entry
, &acpi_prt_list
, list
) {
77 if ((segment
== entry
->id
.segment
)
78 && (bus
== entry
->id
.bus
)
79 && (device
== entry
->id
.device
)
80 && (pin
== entry
->pin
)) {
81 spin_unlock(&acpi_prt_lock
);
85 spin_unlock(&acpi_prt_lock
);
89 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
90 static struct dmi_system_id medion_md9580
[] = {
92 .ident
= "Medion MD9580-F laptop",
94 DMI_MATCH(DMI_SYS_VENDOR
, "MEDIONNB"),
95 DMI_MATCH(DMI_PRODUCT_NAME
, "A555"),
101 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
102 static struct dmi_system_id dell_optiplex
[] = {
104 .ident
= "Dell Optiplex GX1",
106 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer Corporation"),
107 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex GX1 600S+"),
113 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
114 static struct dmi_system_id hp_t5710
[] = {
118 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
119 DMI_MATCH(DMI_PRODUCT_NAME
, "hp t5000 series"),
120 DMI_MATCH(DMI_BOARD_NAME
, "098Ch"),
127 struct dmi_system_id
*system
;
128 unsigned int segment
;
132 char *source
; /* according to BIOS */
136 #define PCI_INTX_PIN(c) (c - 'A' + 1)
139 * These systems have incorrect _PRT entries. The BIOS claims the PCI
140 * interrupt at the listed segment/bus/device/pin is connected to the first
141 * link device, but it is actually connected to the second.
143 static struct prt_quirk prt_quirks
[] = {
144 { medion_md9580
, 0, 0, 9, PCI_INTX_PIN('A'),
145 "\\_SB_.PCI0.ISA_.LNKA",
146 "\\_SB_.PCI0.ISA_.LNKB"},
147 { dell_optiplex
, 0, 0, 0xd, PCI_INTX_PIN('A'),
150 { hp_t5710
, 0, 0, 1, PCI_INTX_PIN('A'),
156 do_prt_fixups(struct acpi_prt_entry
*entry
, struct acpi_pci_routing_table
*prt
)
159 struct prt_quirk
*quirk
;
161 for (i
= 0; i
< ARRAY_SIZE(prt_quirks
); i
++) {
162 quirk
= &prt_quirks
[i
];
164 /* All current quirks involve link devices, not GSIs */
168 if (dmi_check_system(quirk
->system
) &&
169 entry
->id
.segment
== quirk
->segment
&&
170 entry
->id
.bus
== quirk
->bus
&&
171 entry
->id
.device
== quirk
->device
&&
172 entry
->pin
== quirk
->pin
&&
173 !strcmp(prt
->source
, quirk
->source
) &&
174 strlen(prt
->source
) >= strlen(quirk
->actual_source
)) {
175 printk(KERN_WARNING PREFIX
"firmware reports "
176 "%04x:%02x:%02x PCI INT %c connected to %s; "
178 entry
->id
.segment
, entry
->id
.bus
,
179 entry
->id
.device
, pin_name(entry
->pin
),
180 prt
->source
, quirk
->actual_source
);
181 strcpy(prt
->source
, quirk
->actual_source
);
187 acpi_pci_irq_add_entry(acpi_handle handle
,
188 int segment
, int bus
, struct acpi_pci_routing_table
*prt
)
190 struct acpi_prt_entry
*entry
;
192 entry
= kzalloc(sizeof(struct acpi_prt_entry
), GFP_KERNEL
);
197 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
198 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
201 entry
->id
.segment
= segment
;
203 entry
->id
.device
= (prt
->address
>> 16) & 0xFFFF;
204 entry
->pin
= prt
->pin
+ 1;
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
, pin_name(entry
->pin
),
239 prt
->source
, entry
->link
.index
));
241 spin_lock(&acpi_prt_lock
);
242 list_add_tail(&entry
->list
, &acpi_prt_list
);
243 spin_unlock(&acpi_prt_lock
);
248 int acpi_pci_irq_add_prt(acpi_handle handle
, int segment
, int bus
)
251 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
252 struct acpi_pci_routing_table
*entry
;
254 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
255 status
= acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
256 if (ACPI_FAILURE(status
))
259 printk(KERN_DEBUG
"ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
260 (char *) buffer
.pointer
);
262 kfree(buffer
.pointer
);
264 buffer
.length
= ACPI_ALLOCATE_BUFFER
;
265 buffer
.pointer
= NULL
;
267 status
= acpi_get_irq_routing_table(handle
, &buffer
);
268 if (ACPI_FAILURE(status
)) {
269 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRT [%s]",
270 acpi_format_exception(status
)));
271 kfree(buffer
.pointer
);
275 entry
= buffer
.pointer
;
276 while (entry
&& (entry
->length
> 0)) {
277 acpi_pci_irq_add_entry(handle
, segment
, bus
, entry
);
278 entry
= (struct acpi_pci_routing_table
*)
279 ((unsigned long)entry
+ entry
->length
);
282 kfree(buffer
.pointer
);
286 void acpi_pci_irq_del_prt(int segment
, int bus
)
288 struct acpi_prt_entry
*entry
, *tmp
;
291 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
293 spin_lock(&acpi_prt_lock
);
294 list_for_each_entry_safe(entry
, tmp
, &acpi_prt_list
, list
) {
295 if (segment
== entry
->id
.segment
&& bus
== entry
->id
.bus
) {
296 list_del(&entry
->list
);
300 spin_unlock(&acpi_prt_lock
);
303 /* --------------------------------------------------------------------------
304 PCI Interrupt Routing Support
305 -------------------------------------------------------------------------- */
307 acpi_pci_allocate_irq(struct acpi_prt_entry
*entry
,
308 int *triggering
, int *polarity
, char **link
)
313 if (entry
->link
.handle
) {
314 irq
= acpi_pci_link_allocate_irq(entry
->link
.handle
,
315 entry
->link
.index
, triggering
,
318 printk(KERN_WARNING PREFIX
319 "Invalid IRQ link routing entry\n");
323 irq
= entry
->link
.index
;
324 *triggering
= ACPI_LEVEL_SENSITIVE
;
325 *polarity
= ACPI_ACTIVE_LOW
;
328 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found GSI %d\n", irq
));
333 acpi_pci_free_irq(struct acpi_prt_entry
*entry
)
337 if (entry
->link
.handle
) {
338 irq
= acpi_pci_link_free_irq(entry
->link
.handle
);
340 irq
= entry
->link
.index
;
345 static struct acpi_prt_entry
*
346 acpi_pci_irq_lookup(struct pci_dev
*dev
, int pin
)
348 struct acpi_prt_entry
*entry
;
349 struct pci_dev
*bridge
;
350 u8 bridge_pin
, orig_pin
= pin
;
352 entry
= acpi_pci_irq_find_prt_entry(dev
, pin
);
354 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %s[%c] _PRT entry\n",
355 pci_name(dev
), pin_name(pin
)));
360 * Attempt to derive an IRQ for this device from a parent bridge's
361 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
363 bridge
= dev
->bus
->self
;
365 pin
= (((pin
- 1) + PCI_SLOT(dev
->devfn
)) % 4) + 1;
367 if ((bridge
->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS
) {
368 /* PC card has the same IRQ as its cardbridge */
369 bridge_pin
= bridge
->pin
;
371 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
372 "No interrupt pin configured for device %s\n",
379 entry
= acpi_pci_irq_find_prt_entry(bridge
, pin
);
381 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
382 "Derived GSI for %s INT %c from %s\n",
383 pci_name(dev
), pin_name(orig_pin
),
389 bridge
= dev
->bus
->self
;
392 dev_warn(&dev
->dev
, "can't derive routing for PCI INT %c\n",
398 * acpi_pci_irq_enable
400 * failure: return < 0
403 int acpi_pci_irq_enable(struct pci_dev
*dev
)
405 struct acpi_prt_entry
*entry
;
408 int triggering
= ACPI_LEVEL_SENSITIVE
;
409 int polarity
= ACPI_ACTIVE_LOW
;
417 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
418 "No interrupt pin configured for device %s\n",
423 entry
= acpi_pci_irq_lookup(dev
, pin
);
426 * IDE legacy mode controller IRQs are magic. Why do compat
427 * extensions always make such a nasty mess.
429 if (dev
->class >> 8 == PCI_CLASS_STORAGE_IDE
&&
430 (dev
->class & 0x05) == 0)
435 gsi
= acpi_pci_allocate_irq(entry
, &triggering
, &polarity
,
441 * No IRQ known to the ACPI subsystem - maybe the BIOS /
442 * driver reported one, then use it. Exit in any case.
445 dev_warn(&dev
->dev
, "PCI INT %c: no GSI", pin_name(pin
));
446 /* Interrupt Line values above 0xF are forbidden */
447 if (dev
->irq
> 0 && (dev
->irq
<= 0xF)) {
448 printk(" - using IRQ %d\n", dev
->irq
);
449 acpi_register_gsi(dev
->irq
, ACPI_LEVEL_SENSITIVE
,
458 rc
= acpi_register_gsi(gsi
, triggering
, polarity
);
460 dev_warn(&dev
->dev
, "PCI INT %c: failed to register GSI\n",
467 snprintf(link_desc
, sizeof(link_desc
), " -> Link[%s]", link
);
471 dev_info(&dev
->dev
, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
472 pin_name(pin
), link_desc
, gsi
,
473 (triggering
== ACPI_LEVEL_SENSITIVE
) ? "level" : "edge",
474 (polarity
== ACPI_ACTIVE_LOW
) ? "low" : "high", dev
->irq
);
479 /* FIXME: implement x86/x86_64 version */
480 void __attribute__ ((weak
)) acpi_unregister_gsi(u32 i
)
484 void acpi_pci_irq_disable(struct pci_dev
*dev
)
486 struct acpi_prt_entry
*entry
;
495 entry
= acpi_pci_irq_lookup(dev
, pin
);
499 gsi
= acpi_pci_free_irq(entry
);
502 * TBD: It might be worth clearing dev->irq by magic constant
503 * (e.g. PCI_UNDEFINED_IRQ).
506 dev_info(&dev
->dev
, "PCI INT %c disabled\n", pin_name(pin
));
507 acpi_unregister_gsi(gsi
);