blob: e567c03b238ee608a5ab7cc35268139e39788818 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
3 *
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>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
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.
14 *
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.
19 *
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.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27#include <linux/config.h>
28
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>
35#include <linux/pm.h>
36#include <linux/pci.h>
37#include <linux/acpi.h>
38#include <acpi/acpi_bus.h>
39#include <acpi/acpi_drivers.h>
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define _COMPONENT ACPI_PCI_COMPONENT
Len Brown4be44fc2005-08-05 00:44:28 -040042ACPI_MODULE_NAME("pci_irq")
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Len Brown4be44fc2005-08-05 00:44:28 -040044static struct acpi_prt_list acpi_prt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045static DEFINE_SPINLOCK(acpi_prt_lock);
46
47/* --------------------------------------------------------------------------
48 PCI IRQ Routing Table (PRT) Support
49 -------------------------------------------------------------------------- */
50
Len Brown4be44fc2005-08-05 00:44:28 -040051static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
52 int bus,
53 int device, int pin)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
Len Brown4be44fc2005-08-05 00:44:28 -040055 struct list_head *node = NULL;
56 struct acpi_prt_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58 ACPI_FUNCTION_TRACE("acpi_pci_irq_find_prt_entry");
59
60 if (!acpi_prt.count)
61 return_PTR(NULL);
62
63 /*
64 * Parse through all PRT entries looking for a match on the specified
65 * PCI device's segment, bus, device, and pin (don't care about func).
66 *
67 */
68 spin_lock(&acpi_prt_lock);
69 list_for_each(node, &acpi_prt.entries) {
70 entry = list_entry(node, struct acpi_prt_entry, node);
Len Brown4be44fc2005-08-05 00:44:28 -040071 if ((segment == entry->id.segment)
72 && (bus == entry->id.bus)
73 && (device == entry->id.device)
74 && (pin == entry->pin)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 spin_unlock(&acpi_prt_lock);
76 return_PTR(entry);
77 }
78 }
79
80 spin_unlock(&acpi_prt_lock);
81 return_PTR(NULL);
82}
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084static int
Len Brown4be44fc2005-08-05 00:44:28 -040085acpi_pci_irq_add_entry(acpi_handle handle,
86 int segment, int bus, struct acpi_pci_routing_table *prt)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Len Brown4be44fc2005-08-05 00:44:28 -040088 struct acpi_prt_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90 ACPI_FUNCTION_TRACE("acpi_pci_irq_add_entry");
91
92 if (!prt)
93 return_VALUE(-EINVAL);
94
95 entry = kmalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
96 if (!entry)
97 return_VALUE(-ENOMEM);
98 memset(entry, 0, sizeof(struct acpi_prt_entry));
99
100 entry->id.segment = segment;
101 entry->id.bus = bus;
102 entry->id.device = (prt->address >> 16) & 0xFFFF;
103 entry->id.function = prt->address & 0xFFFF;
104 entry->pin = prt->pin;
105
106 /*
107 * Type 1: Dynamic
108 * ---------------
109 * The 'source' field specifies the PCI interrupt link device used to
110 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
111 * indicates which resource descriptor in the resource template (of
112 * the link device) this interrupt is allocated from.
113 *
114 * NOTE: Don't query the Link Device for IRQ information at this time
115 * because Link Device enumeration may not have occurred yet
116 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
117 * namespace).
118 */
119 if (prt->source[0]) {
120 acpi_get_handle(handle, prt->source, &entry->link.handle);
121 entry->link.index = prt->source_index;
122 }
123 /*
124 * Type 2: Static
125 * --------------
126 * The 'source' field is NULL, and the 'source_index' field specifies
127 * the IRQ value, which is hardwired to specific interrupt inputs on
128 * the interrupt controller.
129 */
130 else
131 entry->link.index = prt->source_index;
132
133 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400134 " %02X:%02X:%02X[%c] -> %s[%d]\n",
135 entry->id.segment, entry->id.bus,
136 entry->id.device, ('A' + entry->pin), prt->source,
137 entry->link.index));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 spin_lock(&acpi_prt_lock);
140 list_add_tail(&entry->node, &acpi_prt.entries);
141 acpi_prt.count++;
142 spin_unlock(&acpi_prt_lock);
143
144 return_VALUE(0);
145}
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147static void
Len Brown4be44fc2005-08-05 00:44:28 -0400148acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Len Brown4be44fc2005-08-05 00:44:28 -0400150 if (segment == entry->id.segment && bus == entry->id.bus) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 acpi_prt.count--;
152 list_del(&entry->node);
153 kfree(entry);
154 }
155}
156
Len Brown4be44fc2005-08-05 00:44:28 -0400157int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
Len Brown4be44fc2005-08-05 00:44:28 -0400159 acpi_status status = AE_OK;
160 char *pathname = NULL;
161 struct acpi_buffer buffer = { 0, NULL };
162 struct acpi_pci_routing_table *prt = NULL;
163 struct acpi_pci_routing_table *entry = NULL;
164 static int first_time = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 ACPI_FUNCTION_TRACE("acpi_pci_irq_add_prt");
167
Len Brown4be44fc2005-08-05 00:44:28 -0400168 pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
169 if (!pathname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return_VALUE(-ENOMEM);
171 memset(pathname, 0, ACPI_PATHNAME_MAX);
172
173 if (first_time) {
174 acpi_prt.count = 0;
175 INIT_LIST_HEAD(&acpi_prt.entries);
176 first_time = 0;
177 }
178
179 /*
180 * NOTE: We're given a 'handle' to the _PRT object's parent device
181 * (either a PCI root bridge or PCI-PCI bridge).
182 */
183
184 buffer.length = ACPI_PATHNAME_MAX;
185 buffer.pointer = pathname;
186 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
187
188 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400189 pathname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191 /*
192 * Evaluate this _PRT and add its entries to our global list (acpi_prt).
193 */
194
195 buffer.length = 0;
196 buffer.pointer = NULL;
197 kfree(pathname);
198 status = acpi_get_irq_routing_table(handle, &buffer);
199 if (status != AE_BUFFER_OVERFLOW) {
200 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400201 acpi_format_exception(status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return_VALUE(-ENODEV);
203 }
204
205 prt = kmalloc(buffer.length, GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400206 if (!prt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 return_VALUE(-ENOMEM);
208 }
209 memset(prt, 0, buffer.length);
210 buffer.pointer = prt;
211
212 status = acpi_get_irq_routing_table(handle, &buffer);
213 if (ACPI_FAILURE(status)) {
214 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400215 acpi_format_exception(status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 kfree(buffer.pointer);
217 return_VALUE(-ENODEV);
218 }
219
220 entry = prt;
221
222 while (entry && (entry->length > 0)) {
223 acpi_pci_irq_add_entry(handle, segment, bus, entry);
224 entry = (struct acpi_pci_routing_table *)
Len Brown4be44fc2005-08-05 00:44:28 -0400225 ((unsigned long)entry + entry->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
227
228 kfree(prt);
229
230 return_VALUE(0);
231}
232
Len Brown4be44fc2005-08-05 00:44:28 -0400233void acpi_pci_irq_del_prt(int segment, int bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
Len Brown4be44fc2005-08-05 00:44:28 -0400235 struct list_head *node = NULL, *n = NULL;
236 struct acpi_prt_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Len Brown4be44fc2005-08-05 00:44:28 -0400238 if (!acpi_prt.count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 return;
240 }
241
Len Brown4be44fc2005-08-05 00:44:28 -0400242 printk(KERN_DEBUG
243 "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment,
244 bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 spin_lock(&acpi_prt_lock);
246 list_for_each_safe(node, n, &acpi_prt.entries) {
247 entry = list_entry(node, struct acpi_prt_entry, node);
248
249 acpi_pci_irq_del_entry(segment, bus, entry);
250 }
251 spin_unlock(&acpi_prt_lock);
252}
Len Brown4be44fc2005-08-05 00:44:28 -0400253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/* --------------------------------------------------------------------------
255 PCI Interrupt Routing Support
256 -------------------------------------------------------------------------- */
Len Brown4be44fc2005-08-05 00:44:28 -0400257typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
David Shaohua Li87bec662005-07-27 23:02:00 -0400259static int
260acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
Len Brown4be44fc2005-08-05 00:44:28 -0400261 int *edge_level, int *active_high_low, char **link)
David Shaohua Li87bec662005-07-27 23:02:00 -0400262{
Len Brown4be44fc2005-08-05 00:44:28 -0400263 int irq;
David Shaohua Li87bec662005-07-27 23:02:00 -0400264
265 ACPI_FUNCTION_TRACE("acpi_pci_allocate_irq");
266
267 if (entry->link.handle) {
268 irq = acpi_pci_link_allocate_irq(entry->link.handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400269 entry->link.index, edge_level,
270 active_high_low, link);
David Shaohua Li87bec662005-07-27 23:02:00 -0400271 if (irq < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400272 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
273 "Invalid IRQ link routing entry\n"));
David Shaohua Li87bec662005-07-27 23:02:00 -0400274 return_VALUE(-1);
275 }
276 } else {
277 irq = entry->link.index;
278 *edge_level = ACPI_LEVEL_SENSITIVE;
279 *active_high_low = ACPI_ACTIVE_LOW;
280 }
281
282 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
283 return_VALUE(irq);
284}
285
286static int
287acpi_pci_free_irq(struct acpi_prt_entry *entry,
Len Brown4be44fc2005-08-05 00:44:28 -0400288 int *edge_level, int *active_high_low, char **link)
David Shaohua Li87bec662005-07-27 23:02:00 -0400289{
Len Brown4be44fc2005-08-05 00:44:28 -0400290 int irq;
David Shaohua Li87bec662005-07-27 23:02:00 -0400291
292 ACPI_FUNCTION_TRACE("acpi_pci_free_irq");
293 if (entry->link.handle) {
294 irq = acpi_pci_link_free_irq(entry->link.handle);
295 } else {
296 irq = entry->link.index;
297 }
298 return_VALUE(irq);
299}
Len Brown4be44fc2005-08-05 00:44:28 -0400300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301/*
302 * acpi_pci_irq_lookup
303 * success: return IRQ >= 0
304 * failure: return -1
305 */
306static int
Len Brown4be44fc2005-08-05 00:44:28 -0400307acpi_pci_irq_lookup(struct pci_bus *bus,
308 int device,
309 int pin,
310 int *edge_level,
311 int *active_high_low, char **link, irq_lookup_func func)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
Len Brown4be44fc2005-08-05 00:44:28 -0400313 struct acpi_prt_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 int segment = pci_domain_nr(bus);
315 int bus_nr = bus->number;
David Shaohua Li87bec662005-07-27 23:02:00 -0400316 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
318 ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup");
319
Len Brown4be44fc2005-08-05 00:44:28 -0400320 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
321 "Searching for PRT entry for %02x:%02x:%02x[%c]\n",
322 segment, bus_nr, device, ('A' + pin)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Len Brown4be44fc2005-08-05 00:44:28 -0400324 entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 if (!entry) {
326 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n"));
327 return_VALUE(-1);
328 }
Len Brown4be44fc2005-08-05 00:44:28 -0400329
David Shaohua Li87bec662005-07-27 23:02:00 -0400330 ret = func(entry, edge_level, active_high_low, link);
331 return_VALUE(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332}
333
334/*
335 * acpi_pci_irq_derive
336 * success: return IRQ >= 0
337 * failure: return < 0
338 */
339static int
Len Brown4be44fc2005-08-05 00:44:28 -0400340acpi_pci_irq_derive(struct pci_dev *dev,
341 int pin,
342 int *edge_level,
343 int *active_high_low, char **link, irq_lookup_func func)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
Len Brown4be44fc2005-08-05 00:44:28 -0400345 struct pci_dev *bridge = dev;
346 int irq = -1;
347 u8 bridge_pin = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 ACPI_FUNCTION_TRACE("acpi_pci_irq_derive");
350
351 if (!dev)
352 return_VALUE(-EINVAL);
353
354 /*
355 * Attempt to derive an IRQ for this device from a parent bridge's
356 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
357 */
358 while (irq < 0 && bridge->bus->self) {
359 pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
360 bridge = bridge->bus->self;
361
362 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
363 /* PC card has the same IRQ as its cardbridge */
Kristen Accardi8015a012005-11-02 16:24:35 -0800364 bridge_pin = bridge->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (!bridge_pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400366 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
367 "No interrupt pin configured for device %s\n",
368 pci_name(bridge)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return_VALUE(-1);
370 }
371 /* Pin is from 0 to 3 */
Len Brown4be44fc2005-08-05 00:44:28 -0400372 bridge_pin--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 pin = bridge_pin;
374 }
375
376 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
Len Brown4be44fc2005-08-05 00:44:28 -0400377 pin, edge_level, active_high_low,
378 link, func);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 }
380
381 if (irq < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400382 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
383 "Unable to derive IRQ for device %s\n",
384 pci_name(dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return_VALUE(-1);
386 }
387
388 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400389 irq, pci_name(dev), pci_name(bridge)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 return_VALUE(irq);
392}
393
394/*
395 * acpi_pci_irq_enable
396 * success: return 0
397 * failure: return < 0
398 */
399
Len Brown4be44fc2005-08-05 00:44:28 -0400400int acpi_pci_irq_enable(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401{
Len Brown4be44fc2005-08-05 00:44:28 -0400402 int irq = 0;
403 u8 pin = 0;
404 int edge_level = ACPI_LEVEL_SENSITIVE;
405 int active_high_low = ACPI_ACTIVE_LOW;
406 char *link = NULL;
407 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 ACPI_FUNCTION_TRACE("acpi_pci_irq_enable");
410
411 if (!dev)
412 return_VALUE(-EINVAL);
Len Brown4be44fc2005-08-05 00:44:28 -0400413
Kristen Accardi8015a012005-11-02 16:24:35 -0800414 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (!pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400416 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417 "No interrupt pin configured for device %s\n",
418 pci_name(dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return_VALUE(0);
420 }
421 pin--;
422
423 if (!dev->bus) {
Len Brown4be44fc2005-08-05 00:44:28 -0400424 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
425 "Invalid (NULL) 'bus' field\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 return_VALUE(-ENODEV);
427 }
428
429 /*
430 * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
431 * values override any BIOS-assigned IRQs set during boot.
432 */
Len Brown4be44fc2005-08-05 00:44:28 -0400433 irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
434 &edge_level, &active_high_low, &link,
435 acpi_pci_allocate_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
437 /*
438 * If no PRT entry was found, we'll try to derive an IRQ from the
439 * device's parent bridge.
440 */
441 if (irq < 0)
Len Brown4be44fc2005-08-05 00:44:28 -0400442 irq = acpi_pci_irq_derive(dev, pin, &edge_level,
443 &active_high_low, &link,
444 acpi_pci_allocate_irq);
445
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 /*
447 * No IRQ known to the ACPI subsystem - maybe the BIOS /
448 * driver reported one, then use it. Exit in any case.
449 */
450 if (irq < 0) {
451 printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI",
Len Brown4be44fc2005-08-05 00:44:28 -0400452 pci_name(dev), ('A' + pin));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 /* Interrupt Line values above 0xF are forbidden */
Linus Torvalds44f8e1a2005-07-02 10:35:33 -0700454 if (dev->irq > 0 && (dev->irq <= 0xF)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 printk(" - using IRQ %d\n", dev->irq);
Len Brown4be44fc2005-08-05 00:44:28 -0400456 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
457 ACPI_ACTIVE_LOW);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 return_VALUE(0);
Len Brown4be44fc2005-08-05 00:44:28 -0400459 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 printk("\n");
461 return_VALUE(0);
462 }
Len Brown4be44fc2005-08-05 00:44:28 -0400463 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400465 rc = acpi_register_gsi(irq, edge_level, active_high_low);
466 if (rc < 0) {
467 printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: failed "
468 "to register GSI\n", pci_name(dev), ('A' + pin));
469 return_VALUE(rc);
470 }
471 dev->irq = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ",
Len Brown4be44fc2005-08-05 00:44:28 -0400474 pci_name(dev), 'A' + pin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476 if (link)
477 printk("Link [%s] -> ", link);
478
479 printk("GSI %u (%s, %s) -> IRQ %d\n", irq,
Len Brown4be44fc2005-08-05 00:44:28 -0400480 (edge_level == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
481 (active_high_low == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 return_VALUE(0);
484}
Len Brown4be44fc2005-08-05 00:44:28 -0400485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486EXPORT_SYMBOL(acpi_pci_irq_enable);
487
David Shaohua Li87bec662005-07-27 23:02:00 -0400488/* FIXME: implement x86/x86_64 version */
Len Brown4be44fc2005-08-05 00:44:28 -0400489void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
Len Brown4be44fc2005-08-05 00:44:28 -0400491}
492
493void acpi_pci_irq_disable(struct pci_dev *dev)
494{
495 int gsi = 0;
496 u8 pin = 0;
497 int edge_level = ACPI_LEVEL_SENSITIVE;
498 int active_high_low = ACPI_ACTIVE_LOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 ACPI_FUNCTION_TRACE("acpi_pci_irq_disable");
501
Kenji Kaneshige5f0110f2005-09-03 00:34:32 -0400502 if (!dev || !dev->bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 return_VOID;
504
Kristen Accardi8015a012005-11-02 16:24:35 -0800505 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 if (!pin)
507 return_VOID;
508 pin--;
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 /*
511 * First we check the PCI IRQ routing table (PRT) for an IRQ.
512 */
Len Brown4be44fc2005-08-05 00:44:28 -0400513 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
514 &edge_level, &active_high_low, NULL,
515 acpi_pci_free_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 /*
517 * If no PRT entry was found, we'll try to derive an IRQ from the
518 * device's parent bridge.
519 */
520 if (gsi < 0)
Len Brown4be44fc2005-08-05 00:44:28 -0400521 gsi = acpi_pci_irq_derive(dev, pin,
522 &edge_level, &active_high_low, NULL,
523 acpi_pci_free_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 if (gsi < 0)
525 return_VOID;
526
527 /*
528 * TBD: It might be worth clearing dev->irq by magic constant
529 * (e.g. PCI_UNDEFINED_IRQ).
530 */
531
532 printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n",
533 pci_name(dev));
534
535 acpi_unregister_gsi(gsi);
536
537 return_VOID;
538}