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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>
Bjorn Helgaas39488b02008-12-08 21:31:42 -07007 * (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
8 * Bjorn Helgaas <bjorn.helgaas@hp.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 */
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070030#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/kernel.h>
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/types.h>
35#include <linux/proc_fs.h>
36#include <linux/spinlock.h>
37#include <linux/pm.h>
38#include <linux/pci.h>
39#include <linux/acpi.h>
40#include <acpi/acpi_bus.h>
41#include <acpi/acpi_drivers.h>
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050044ACPI_MODULE_NAME("pci_irq");
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070046struct acpi_prt_entry {
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070047 struct list_head list;
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070048 struct acpi_pci_id id;
49 u8 pin;
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -070050 acpi_handle link;
51 u32 index; /* GSI, or link _CRS index */
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070052};
53
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070054static LIST_HEAD(acpi_prt_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055static DEFINE_SPINLOCK(acpi_prt_lock);
56
Bjorn Helgaascf68b802008-12-08 21:30:36 -070057static inline char pin_name(int pin)
58{
Bjorn Helgaase64e9db2008-12-08 21:30:41 -070059 return 'A' + pin - 1;
Bjorn Helgaascf68b802008-12-08 21:30:36 -070060}
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062/* --------------------------------------------------------------------------
63 PCI IRQ Routing Table (PRT) Support
64 -------------------------------------------------------------------------- */
65
Bjorn Helgaas063563b2008-12-08 21:30:51 -070066static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
67 int pin)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070069 struct acpi_prt_entry *entry;
Bjorn Helgaas063563b2008-12-08 21:30:51 -070070 int segment = pci_domain_nr(dev->bus);
71 int bus = dev->bus->number;
72 int device = PCI_SLOT(dev->devfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 spin_lock(&acpi_prt_lock);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070075 list_for_each_entry(entry, &acpi_prt_list, list) {
Len Brown4be44fc2005-08-05 00:44:28 -040076 if ((segment == entry->id.segment)
77 && (bus == entry->id.bus)
78 && (device == entry->id.device)
79 && (pin == entry->pin)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 spin_unlock(&acpi_prt_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -040081 return entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 }
83 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 spin_unlock(&acpi_prt_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -040085 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086}
87
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070088/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
89static struct dmi_system_id medion_md9580[] = {
90 {
91 .ident = "Medion MD9580-F laptop",
92 .matches = {
93 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
94 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
95 },
96 },
97 { }
98};
99
100/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
101static struct dmi_system_id dell_optiplex[] = {
102 {
103 .ident = "Dell Optiplex GX1",
104 .matches = {
105 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
106 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
107 },
108 },
109 { }
110};
111
112/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
113static struct dmi_system_id hp_t5710[] = {
114 {
115 .ident = "HP t5710",
116 .matches = {
117 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
118 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
119 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
120 },
121 },
122 { }
123};
124
125struct prt_quirk {
126 struct dmi_system_id *system;
127 unsigned int segment;
128 unsigned int bus;
129 unsigned int device;
130 unsigned char pin;
131 char *source; /* according to BIOS */
132 char *actual_source;
133};
134
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700135#define PCI_INTX_PIN(c) (c - 'A' + 1)
136
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700137/*
138 * These systems have incorrect _PRT entries. The BIOS claims the PCI
139 * interrupt at the listed segment/bus/device/pin is connected to the first
140 * link device, but it is actually connected to the second.
141 */
142static struct prt_quirk prt_quirks[] = {
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700143 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
Bjorn Helgaasb97d4802008-03-25 11:21:11 -0600144 "\\_SB_.PCI0.ISA_.LNKA",
145 "\\_SB_.PCI0.ISA_.LNKB"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700146 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700147 "\\_SB_.LNKB",
148 "\\_SB_.LNKA"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700149 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700150 "\\_SB_.PCI0.LNK1",
151 "\\_SB_.PCI0.LNK3"},
152};
153
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700154static void do_prt_fixups(struct acpi_prt_entry *entry,
155 struct acpi_pci_routing_table *prt)
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700156{
157 int i;
158 struct prt_quirk *quirk;
159
160 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
161 quirk = &prt_quirks[i];
162
163 /* All current quirks involve link devices, not GSIs */
164 if (!prt->source)
165 continue;
166
167 if (dmi_check_system(quirk->system) &&
168 entry->id.segment == quirk->segment &&
169 entry->id.bus == quirk->bus &&
170 entry->id.device == quirk->device &&
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700171 entry->pin == quirk->pin &&
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700172 !strcmp(prt->source, quirk->source) &&
173 strlen(prt->source) >= strlen(quirk->actual_source)) {
174 printk(KERN_WARNING PREFIX "firmware reports "
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600175 "%04x:%02x:%02x PCI INT %c connected to %s; "
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700176 "changing to %s\n",
177 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700178 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700179 prt->source, quirk->actual_source);
180 strcpy(prt->source, quirk->actual_source);
181 }
182 }
183}
184
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700185static int acpi_pci_irq_add_entry(acpi_handle handle, int segment, int bus,
186 struct acpi_pci_routing_table *prt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700188 struct acpi_prt_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Burman Yan36bcbec2006-12-19 12:56:11 -0800190 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400192 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700194 /*
195 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
196 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
197 * it here.
198 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 entry->id.segment = segment;
200 entry->id.bus = bus;
201 entry->id.device = (prt->address >> 16) & 0xFFFF;
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700202 entry->pin = prt->pin + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700204 do_prt_fixups(entry, prt);
205
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700206 entry->index = prt->source_index;
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 /*
209 * Type 1: Dynamic
210 * ---------------
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.
215 *
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
219 * namespace).
220 */
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700221 if (prt->source[0])
222 acpi_get_handle(handle, prt->source, &entry->link);
223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 /*
225 * Type 2: Static
226 * --------------
227 * The 'source' field is NULL, and the 'source_index' field specifies
228 * the IRQ value, which is hardwired to specific interrupt inputs on
229 * the interrupt controller.
230 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
Bjorn Helgaas21a53282008-12-08 21:30:05 -0700233 " %04x:%02x:%02x[%c] -> %s[%d]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400234 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700235 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700236 prt->source, entry->index));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238 spin_lock(&acpi_prt_lock);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700239 list_add_tail(&entry->list, &acpi_prt_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 spin_unlock(&acpi_prt_lock);
241
Patrick Mocheld550d982006-06-27 00:41:40 -0400242 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
Len Brown4be44fc2005-08-05 00:44:28 -0400245int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700247 acpi_status status;
248 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
249 struct acpi_pci_routing_table *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700251 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
252 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
253 if (ACPI_FAILURE(status))
254 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700257 (char *) buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700259 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700261 buffer.length = ACPI_ALLOCATE_BUFFER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 buffer.pointer = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264 status = acpi_get_irq_routing_table(handle, &buffer);
265 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400266 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
267 acpi_format_exception(status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400269 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
271
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700272 entry = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 while (entry && (entry->length > 0)) {
274 acpi_pci_irq_add_entry(handle, segment, bus, entry);
275 entry = (struct acpi_pci_routing_table *)
Len Brown4be44fc2005-08-05 00:44:28 -0400276 ((unsigned long)entry + entry->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 }
278
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700279 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400280 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281}
282
Len Brown4be44fc2005-08-05 00:44:28 -0400283void acpi_pci_irq_del_prt(int segment, int bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700285 struct acpi_prt_entry *entry, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Len Brown4be44fc2005-08-05 00:44:28 -0400287 printk(KERN_DEBUG
Bjorn Helgaas21a53282008-12-08 21:30:05 -0700288 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
289 segment, bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 spin_lock(&acpi_prt_lock);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700291 list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
292 if (segment == entry->id.segment && bus == entry->id.bus) {
293 list_del(&entry->list);
294 kfree(entry);
295 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 }
297 spin_unlock(&acpi_prt_lock);
298}
Len Brown4be44fc2005-08-05 00:44:28 -0400299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300/* --------------------------------------------------------------------------
301 PCI Interrupt Routing Support
302 -------------------------------------------------------------------------- */
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700303static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700305 struct acpi_prt_entry *entry;
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700306 struct pci_dev *bridge;
307 u8 bridge_pin, orig_pin = pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Bjorn Helgaas063563b2008-12-08 21:30:51 -0700309 entry = acpi_pci_irq_find_prt_entry(dev, pin);
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700310 if (entry) {
311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
Bjorn Helgaas13504872008-12-08 21:30:56 -0700312 pci_name(dev), pin_name(pin)));
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700313 return entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 }
Len Brown4be44fc2005-08-05 00:44:28 -0400315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 /*
317 * Attempt to derive an IRQ for this device from a parent bridge's
318 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
319 */
Bjorn Helgaasee401362008-12-08 21:31:11 -0700320 bridge = dev->bus->self;
321 while (bridge) {
322 pin = (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
325 /* PC card has the same IRQ as its cardbridge */
Kristen Accardi8015a012005-11-02 16:24:35 -0800326 bridge_pin = bridge->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 if (!bridge_pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400328 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
329 "No interrupt pin configured for device %s\n",
330 pci_name(bridge)));
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700331 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 pin = bridge_pin;
334 }
335
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700336 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700337 if (entry) {
338 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
339 "Derived GSI for %s INT %c from %s\n",
340 pci_name(dev), pin_name(orig_pin),
341 pci_name(bridge)));
342 return entry;
343 }
Bjorn Helgaasee401362008-12-08 21:31:11 -0700344
345 dev = bridge;
346 bridge = dev->bus->self;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
348
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700349 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
350 pin_name(orig_pin));
351 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
Len Brown4be44fc2005-08-05 00:44:28 -0400354int acpi_pci_irq_enable(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700356 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700357 int gsi;
358 u8 pin;
Bob Moore50eca3e2005-09-30 19:03:00 -0400359 int triggering = ACPI_LEVEL_SENSITIVE;
360 int polarity = ACPI_ACTIVE_LOW;
Len Brown4be44fc2005-08-05 00:44:28 -0400361 char *link = NULL;
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600362 char link_desc[16];
Len Brown4be44fc2005-08-05 00:44:28 -0400363 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Kristen Accardi8015a012005-11-02 16:24:35 -0800365 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 if (!pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400367 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
368 "No interrupt pin configured for device %s\n",
369 pci_name(dev)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400370 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700373 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700374 if (!entry) {
Alan Cox96c2a872008-01-10 22:49:58 -0500375 /*
376 * IDE legacy mode controller IRQs are magic. Why do compat
377 * extensions always make such a nasty mess.
378 */
379 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
380 (dev->class & 0x05) == 0)
381 return 0;
382 }
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700383
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700384 if (entry) {
385 if (entry->link)
386 gsi = acpi_pci_link_allocate_irq(entry->link,
387 entry->index,
388 &triggering, &polarity,
389 &link);
390 else
391 gsi = entry->index;
392 } else
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700393 gsi = -1;
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 /*
396 * No IRQ known to the ACPI subsystem - maybe the BIOS /
397 * driver reported one, then use it. Exit in any case.
398 */
Bjorn Helgaasc13f8892008-12-08 21:30:26 -0700399 if (gsi < 0) {
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700400 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 /* Interrupt Line values above 0xF are forbidden */
Linus Torvalds44f8e1a2005-07-02 10:35:33 -0700402 if (dev->irq > 0 && (dev->irq <= 0xF)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 printk(" - using IRQ %d\n", dev->irq);
Len Brown4be44fc2005-08-05 00:44:28 -0400404 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
405 ACPI_ACTIVE_LOW);
Patrick Mocheld550d982006-06-27 00:41:40 -0400406 return 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400407 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 printk("\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400409 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 }
Len Brown4be44fc2005-08-05 00:44:28 -0400411 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Bjorn Helgaasc13f8892008-12-08 21:30:26 -0700413 rc = acpi_register_gsi(gsi, triggering, polarity);
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400414 if (rc < 0) {
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600415 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700416 pin_name(pin));
Patrick Mocheld550d982006-06-27 00:41:40 -0400417 return rc;
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400418 }
419 dev->irq = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 if (link)
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600422 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
423 else
424 link_desc[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600426 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700427 pin_name(pin), link_desc, gsi,
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600428 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
429 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Patrick Mocheld550d982006-06-27 00:41:40 -0400431 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
Len Brown4be44fc2005-08-05 00:44:28 -0400433
David Shaohua Li87bec662005-07-27 23:02:00 -0400434/* FIXME: implement x86/x86_64 version */
Len Brown4be44fc2005-08-05 00:44:28 -0400435void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
Len Brown4be44fc2005-08-05 00:44:28 -0400437}
438
439void acpi_pci_irq_disable(struct pci_dev *dev)
440{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700441 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700442 int gsi;
443 u8 pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Kristen Accardi8015a012005-11-02 16:24:35 -0800445 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (!pin)
Patrick Mocheld550d982006-06-27 00:41:40 -0400447 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700449 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700450 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400451 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700453 if (entry->link)
454 gsi = acpi_pci_link_free_irq(entry->link);
455 else
456 gsi = entry->index;
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 /*
459 * TBD: It might be worth clearing dev->irq by magic constant
460 * (e.g. PCI_UNDEFINED_IRQ).
461 */
462
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700463 dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 acpi_unregister_gsi(gsi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}