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(struct pci_dev
*dev
,
75 struct acpi_prt_entry
*entry
= NULL
;
76 int segment
= pci_domain_nr(dev
->bus
);
77 int bus
= dev
->bus
->number
;
78 int device
= PCI_SLOT(dev
->devfn
);
84 * Parse through all PRT entries looking for a match on the specified
85 * PCI device's segment, bus, device, and pin (don't care about func).
88 spin_lock(&acpi_prt_lock
);
89 list_for_each_entry(entry
, &acpi_prt
.entries
, node
) {
90 if ((segment
== entry
->id
.segment
)
91 && (bus
== entry
->id
.bus
)
92 && (device
== entry
->id
.device
)
93 && (pin
== entry
->pin
)) {
94 spin_unlock(&acpi_prt_lock
);
99 spin_unlock(&acpi_prt_lock
);
103 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
104 static struct dmi_system_id medion_md9580
[] = {
106 .ident
= "Medion MD9580-F laptop",
108 DMI_MATCH(DMI_SYS_VENDOR
, "MEDIONNB"),
109 DMI_MATCH(DMI_PRODUCT_NAME
, "A555"),
115 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
116 static struct dmi_system_id dell_optiplex
[] = {
118 .ident
= "Dell Optiplex GX1",
120 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer Corporation"),
121 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex GX1 600S+"),
127 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
128 static struct dmi_system_id hp_t5710
[] = {
132 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
133 DMI_MATCH(DMI_PRODUCT_NAME
, "hp t5000 series"),
134 DMI_MATCH(DMI_BOARD_NAME
, "098Ch"),
141 struct dmi_system_id
*system
;
142 unsigned int segment
;
146 char *source
; /* according to BIOS */
150 #define PCI_INTX_PIN(c) (c - 'A' + 1)
153 * These systems have incorrect _PRT entries. The BIOS claims the PCI
154 * interrupt at the listed segment/bus/device/pin is connected to the first
155 * link device, but it is actually connected to the second.
157 static struct prt_quirk prt_quirks
[] = {
158 { medion_md9580
, 0, 0, 9, PCI_INTX_PIN('A'),
159 "\\_SB_.PCI0.ISA_.LNKA",
160 "\\_SB_.PCI0.ISA_.LNKB"},
161 { dell_optiplex
, 0, 0, 0xd, PCI_INTX_PIN('A'),
164 { hp_t5710
, 0, 0, 1, PCI_INTX_PIN('A'),
170 do_prt_fixups(struct acpi_prt_entry
*entry
, struct acpi_pci_routing_table
*prt
)
173 struct prt_quirk
*quirk
;
175 for (i
= 0; i
< ARRAY_SIZE(prt_quirks
); i
++) {
176 quirk
= &prt_quirks
[i
];
178 /* All current quirks involve link devices, not GSIs */
182 if (dmi_check_system(quirk
->system
) &&
183 entry
->id
.segment
== quirk
->segment
&&
184 entry
->id
.bus
== quirk
->bus
&&
185 entry
->id
.device
== quirk
->device
&&
186 entry
->pin
== quirk
->pin
&&
187 !strcmp(prt
->source
, quirk
->source
) &&
188 strlen(prt
->source
) >= strlen(quirk
->actual_source
)) {
189 printk(KERN_WARNING PREFIX
"firmware reports "
190 "%04x:%02x:%02x PCI INT %c connected to %s; "
192 entry
->id
.segment
, entry
->id
.bus
,
193 entry
->id
.device
, pin_name(entry
->pin
),
194 prt
->source
, quirk
->actual_source
);
195 strcpy(prt
->source
, quirk
->actual_source
);
201 acpi_pci_irq_add_entry(acpi_handle handle
,
202 int segment
, int bus
, struct acpi_pci_routing_table
*prt
)
204 struct acpi_prt_entry
*entry
= NULL
;
206 entry
= kzalloc(sizeof(struct acpi_prt_entry
), GFP_KERNEL
);
211 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
212 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
215 entry
->id
.segment
= segment
;
217 entry
->id
.device
= (prt
->address
>> 16) & 0xFFFF;
218 entry
->pin
= prt
->pin
+ 1;
220 do_prt_fixups(entry
, prt
);
225 * The 'source' field specifies the PCI interrupt link device used to
226 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
227 * indicates which resource descriptor in the resource template (of
228 * the link device) this interrupt is allocated from.
230 * NOTE: Don't query the Link Device for IRQ information at this time
231 * because Link Device enumeration may not have occurred yet
232 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
235 if (prt
->source
[0]) {
236 acpi_get_handle(handle
, prt
->source
, &entry
->link
.handle
);
237 entry
->link
.index
= prt
->source_index
;
242 * The 'source' field is NULL, and the 'source_index' field specifies
243 * the IRQ value, which is hardwired to specific interrupt inputs on
244 * the interrupt controller.
247 entry
->link
.index
= prt
->source_index
;
249 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO
,
250 " %04x:%02x:%02x[%c] -> %s[%d]\n",
251 entry
->id
.segment
, entry
->id
.bus
,
252 entry
->id
.device
, pin_name(entry
->pin
),
253 prt
->source
, entry
->link
.index
));
255 spin_lock(&acpi_prt_lock
);
256 list_add_tail(&entry
->node
, &acpi_prt
.entries
);
258 spin_unlock(&acpi_prt_lock
);
264 acpi_pci_irq_del_entry(int segment
, int bus
, struct acpi_prt_entry
*entry
)
266 if (segment
== entry
->id
.segment
&& bus
== entry
->id
.bus
) {
268 list_del(&entry
->node
);
273 int acpi_pci_irq_add_prt(acpi_handle handle
, int segment
, int bus
)
276 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
277 struct acpi_pci_routing_table
*entry
;
278 static int first_time
= 1;
282 INIT_LIST_HEAD(&acpi_prt
.entries
);
286 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
287 status
= acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
288 if (ACPI_FAILURE(status
))
291 printk(KERN_DEBUG
"ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
292 (char *) buffer
.pointer
);
294 kfree(buffer
.pointer
);
296 buffer
.length
= ACPI_ALLOCATE_BUFFER
;
297 buffer
.pointer
= NULL
;
299 status
= acpi_get_irq_routing_table(handle
, &buffer
);
300 if (ACPI_FAILURE(status
)) {
301 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRT [%s]",
302 acpi_format_exception(status
)));
303 kfree(buffer
.pointer
);
307 entry
= buffer
.pointer
;
308 while (entry
&& (entry
->length
> 0)) {
309 acpi_pci_irq_add_entry(handle
, segment
, bus
, entry
);
310 entry
= (struct acpi_pci_routing_table
*)
311 ((unsigned long)entry
+ entry
->length
);
314 kfree(buffer
.pointer
);
318 void acpi_pci_irq_del_prt(int segment
, int bus
)
320 struct list_head
*node
= NULL
, *n
= NULL
;
321 struct acpi_prt_entry
*entry
= NULL
;
323 if (!acpi_prt
.count
) {
328 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
330 spin_lock(&acpi_prt_lock
);
331 list_for_each_safe(node
, n
, &acpi_prt
.entries
) {
332 entry
= list_entry(node
, struct acpi_prt_entry
, node
);
334 acpi_pci_irq_del_entry(segment
, bus
, entry
);
336 spin_unlock(&acpi_prt_lock
);
339 /* --------------------------------------------------------------------------
340 PCI Interrupt Routing Support
341 -------------------------------------------------------------------------- */
342 typedef int (*irq_lookup_func
) (struct acpi_prt_entry
*, int *, int *, char **);
345 acpi_pci_allocate_irq(struct acpi_prt_entry
*entry
,
346 int *triggering
, int *polarity
, char **link
)
351 if (entry
->link
.handle
) {
352 irq
= acpi_pci_link_allocate_irq(entry
->link
.handle
,
353 entry
->link
.index
, triggering
,
356 printk(KERN_WARNING PREFIX
357 "Invalid IRQ link routing entry\n");
361 irq
= entry
->link
.index
;
362 *triggering
= ACPI_LEVEL_SENSITIVE
;
363 *polarity
= ACPI_ACTIVE_LOW
;
366 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found GSI %d\n", irq
));
371 acpi_pci_free_irq(struct acpi_prt_entry
*entry
,
372 int *triggering
, int *polarity
, char **link
)
376 if (entry
->link
.handle
) {
377 irq
= acpi_pci_link_free_irq(entry
->link
.handle
);
379 irq
= entry
->link
.index
;
385 * acpi_pci_irq_lookup
386 * success: return IRQ >= 0
390 acpi_pci_irq_lookup(struct pci_dev
*dev
, int pin
,
392 int *polarity
, char **link
, irq_lookup_func func
)
394 struct acpi_prt_entry
*entry
= NULL
;
398 entry
= acpi_pci_irq_find_prt_entry(dev
, pin
);
400 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No %s[%c] _PRT entry\n",
401 pci_name(dev
), pin_name(pin
)));
405 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %s[%c] _PRT entry\n",
406 pci_name(dev
), pin_name(pin
)));
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
,
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
, "Derived GSI %d for %s INT %c from %s\n",
460 irq
, pci_name(dev
), pin_name(orig_pin
), 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
, 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
, 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
);