blob: 41c5e1b799ef938ff1eed92e4cf48a7c7677f8bd [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>
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/spinlock.h>
36#include <linux/pm.h>
37#include <linux/pci.h>
38#include <linux/acpi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <acpi/acpi_bus.h>
41#include <acpi/acpi_drivers.h>
42
Len Browna192a952009-07-28 16:45:54 -040043#define PREFIX "ACPI: "
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050046ACPI_MODULE_NAME("pci_irq");
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070048struct acpi_prt_entry {
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070049 struct list_head list;
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070050 struct acpi_pci_id id;
51 u8 pin;
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -070052 acpi_handle link;
53 u32 index; /* GSI, or link _CRS index */
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070054};
55
Bjorn Helgaascf68b802008-12-08 21:30:36 -070056static inline char pin_name(int pin)
57{
Bjorn Helgaase64e9db2008-12-08 21:30:41 -070058 return 'A' + pin - 1;
Bjorn Helgaascf68b802008-12-08 21:30:36 -070059}
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061/* --------------------------------------------------------------------------
62 PCI IRQ Routing Table (PRT) Support
63 -------------------------------------------------------------------------- */
64
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070065/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
Jan Beulich609d4bc2009-03-12 11:58:25 +000066static const struct dmi_system_id medion_md9580[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070067 {
68 .ident = "Medion MD9580-F laptop",
69 .matches = {
70 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
71 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
72 },
73 },
74 { }
75};
76
77/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
Jan Beulich609d4bc2009-03-12 11:58:25 +000078static const struct dmi_system_id dell_optiplex[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070079 {
80 .ident = "Dell Optiplex GX1",
81 .matches = {
82 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
83 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
84 },
85 },
86 { }
87};
88
89/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
Jan Beulich609d4bc2009-03-12 11:58:25 +000090static const struct dmi_system_id hp_t5710[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070091 {
92 .ident = "HP t5710",
93 .matches = {
94 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
95 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
96 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
97 },
98 },
99 { }
100};
101
102struct prt_quirk {
Jan Beulich609d4bc2009-03-12 11:58:25 +0000103 const struct dmi_system_id *system;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700104 unsigned int segment;
105 unsigned int bus;
106 unsigned int device;
107 unsigned char pin;
Jan Beulich609d4bc2009-03-12 11:58:25 +0000108 const char *source; /* according to BIOS */
109 const char *actual_source;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700110};
111
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700112#define PCI_INTX_PIN(c) (c - 'A' + 1)
113
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700114/*
115 * These systems have incorrect _PRT entries. The BIOS claims the PCI
116 * interrupt at the listed segment/bus/device/pin is connected to the first
117 * link device, but it is actually connected to the second.
118 */
Jan Beulich609d4bc2009-03-12 11:58:25 +0000119static const struct prt_quirk prt_quirks[] = {
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700120 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
Bjorn Helgaasb97d4802008-03-25 11:21:11 -0600121 "\\_SB_.PCI0.ISA_.LNKA",
122 "\\_SB_.PCI0.ISA_.LNKB"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700123 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700124 "\\_SB_.LNKB",
125 "\\_SB_.LNKA"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700126 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700127 "\\_SB_.PCI0.LNK1",
128 "\\_SB_.PCI0.LNK3"},
129};
130
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700131static void do_prt_fixups(struct acpi_prt_entry *entry,
132 struct acpi_pci_routing_table *prt)
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700133{
134 int i;
Jan Beulich609d4bc2009-03-12 11:58:25 +0000135 const struct prt_quirk *quirk;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700136
137 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
138 quirk = &prt_quirks[i];
139
140 /* All current quirks involve link devices, not GSIs */
141 if (!prt->source)
142 continue;
143
144 if (dmi_check_system(quirk->system) &&
145 entry->id.segment == quirk->segment &&
146 entry->id.bus == quirk->bus &&
147 entry->id.device == quirk->device &&
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700148 entry->pin == quirk->pin &&
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700149 !strcmp(prt->source, quirk->source) &&
150 strlen(prt->source) >= strlen(quirk->actual_source)) {
151 printk(KERN_WARNING PREFIX "firmware reports "
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600152 "%04x:%02x:%02x PCI INT %c connected to %s; "
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700153 "changing to %s\n",
154 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700155 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700156 prt->source, quirk->actual_source);
157 strcpy(prt->source, quirk->actual_source);
158 }
159 }
160}
161
Yinghai Lu181380b2013-02-16 11:58:34 -0700162static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev,
163 int pin, struct acpi_pci_routing_table *prt,
164 struct acpi_prt_entry **entry_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Yinghai Lu181380b2013-02-16 11:58:34 -0700166 int segment = pci_domain_nr(dev->bus);
167 int bus = dev->bus->number;
168 int device = PCI_SLOT(dev->devfn);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700169 struct acpi_prt_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Yinghai Lu181380b2013-02-16 11:58:34 -0700171 if (((prt->address >> 16) & 0xffff) != device ||
172 prt->pin + 1 != pin)
173 return -ENODEV;
174
Burman Yan36bcbec2006-12-19 12:56:11 -0800175 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400177 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700179 /*
180 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
181 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
182 * it here.
183 */
Bjorn Helgaas79c44122012-10-30 15:24:06 +0900184 entry->id.segment = segment;
185 entry->id.bus = bus;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 entry->id.device = (prt->address >> 16) & 0xFFFF;
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700187 entry->pin = prt->pin + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700189 do_prt_fixups(entry, prt);
190
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700191 entry->index = prt->source_index;
192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 /*
194 * Type 1: Dynamic
195 * ---------------
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.
200 *
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
204 * namespace).
205 */
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700206 if (prt->source[0])
207 acpi_get_handle(handle, prt->source, &entry->link);
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 /*
210 * Type 2: Static
211 * --------------
212 * The 'source' field is NULL, and the 'source_index' field specifies
213 * the IRQ value, which is hardwired to specific interrupt inputs on
214 * the interrupt controller.
215 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
Bjorn Helgaas21a53282008-12-08 21:30:05 -0700218 " %04x:%02x:%02x[%c] -> %s[%d]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400219 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700220 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700221 prt->source, entry->index));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Yinghai Lu181380b2013-02-16 11:58:34 -0700223 *entry_ptr = entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Patrick Mocheld550d982006-06-27 00:41:40 -0400225 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226}
227
Yinghai Lu181380b2013-02-16 11:58:34 -0700228static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
229 int pin, struct acpi_prt_entry **entry_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700231 acpi_status status;
232 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
233 struct acpi_pci_routing_table *entry;
Yinghai Lu181380b2013-02-16 11:58:34 -0700234 acpi_handle handle = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Yinghai Lu181380b2013-02-16 11:58:34 -0700236 if (dev->bus->bridge)
237 handle = ACPI_HANDLE(dev->bus->bridge);
238
239 if (!handle)
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700240 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Yinghai Lu181380b2013-02-16 11:58:34 -0700242 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 status = acpi_get_irq_routing_table(handle, &buffer);
244 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400246 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
248
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700249 entry = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 while (entry && (entry->length > 0)) {
Yinghai Lu181380b2013-02-16 11:58:34 -0700251 if (!acpi_pci_irq_check_entry(handle, dev, pin,
252 entry, entry_ptr))
253 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 entry = (struct acpi_pci_routing_table *)
Len Brown4be44fc2005-08-05 00:44:28 -0400255 ((unsigned long)entry + entry->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
257
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700258 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400259 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262/* --------------------------------------------------------------------------
263 PCI Interrupt Routing Support
264 -------------------------------------------------------------------------- */
Stefan Assmannd7f61692011-07-15 14:52:30 +0200265#ifdef CONFIG_X86_IO_APIC
266extern int noioapicquirk;
267extern int noioapicreroute;
268
269static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
270{
271 struct pci_bus *bus_it;
272
273 for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
274 if (!bus_it->self)
275 return 0;
276 if (bus_it->self->irq_reroute_variant)
277 return bus_it->self->irq_reroute_variant;
278 }
279 return 0;
280}
281
282/*
283 * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ
284 * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does
285 * during interrupt handling). When this INTx generation cannot be disabled,
286 * we reroute these interrupts to their legacy equivalent to get rid of
287 * spurious interrupts.
288 */
289static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
290 struct acpi_prt_entry *entry)
291{
292 if (noioapicquirk || noioapicreroute) {
293 return 0;
294 } else {
295 switch (bridge_has_boot_interrupt_variant(dev->bus)) {
296 case 0:
297 /* no rerouting necessary */
298 return 0;
299 case INTEL_IRQ_REROUTE_VARIANT:
300 /*
301 * Remap according to INTx routing table in 6700PXH
302 * specs, intel order number 302628-002, section
303 * 2.15.2. Other chipsets (80332, ...) have the same
304 * mapping and are handled here as well.
305 */
306 dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
307 "IRQ %d\n", entry->index,
308 (entry->index % 4) + 16);
309 entry->index = (entry->index % 4) + 16;
310 return 1;
311 default:
312 dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
313 "IRQ: unknown mapping\n", entry->index);
314 return -1;
315 }
316 }
317}
318#endif /* CONFIG_X86_IO_APIC */
319
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700320static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Yinghai Lu181380b2013-02-16 11:58:34 -0700322 struct acpi_prt_entry *entry = NULL;
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700323 struct pci_dev *bridge;
324 u8 bridge_pin, orig_pin = pin;
Yinghai Lu181380b2013-02-16 11:58:34 -0700325 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Yinghai Lu181380b2013-02-16 11:58:34 -0700327 ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry);
328 if (!ret && entry) {
Stefan Assmannd7f61692011-07-15 14:52:30 +0200329#ifdef CONFIG_X86_IO_APIC
330 acpi_reroute_boot_interrupt(dev, entry);
331#endif /* CONFIG_X86_IO_APIC */
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700332 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
Bjorn Helgaas13504872008-12-08 21:30:56 -0700333 pci_name(dev), pin_name(pin)));
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700334 return entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 }
Len Brown4be44fc2005-08-05 00:44:28 -0400336
Yinghai Lu181380b2013-02-16 11:58:34 -0700337 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 * Attempt to derive an IRQ for this device from a parent bridge's
339 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
340 */
Bjorn Helgaasee401362008-12-08 21:31:11 -0700341 bridge = dev->bus->self;
342 while (bridge) {
Bjorn Helgaasc686d142009-02-17 13:49:10 -0700343 pin = pci_swizzle_interrupt_pin(dev, pin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
346 /* PC card has the same IRQ as its cardbridge */
Kristen Accardi8015a012005-11-02 16:24:35 -0800347 bridge_pin = bridge->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 if (!bridge_pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400349 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
350 "No interrupt pin configured for device %s\n",
351 pci_name(bridge)));
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700352 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 pin = bridge_pin;
355 }
356
Yinghai Lu181380b2013-02-16 11:58:34 -0700357 ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry);
358 if (!ret && entry) {
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700359 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
360 "Derived GSI for %s INT %c from %s\n",
361 pci_name(dev), pin_name(orig_pin),
362 pci_name(bridge)));
363 return entry;
364 }
Bjorn Helgaasee401362008-12-08 21:31:11 -0700365
366 dev = bridge;
367 bridge = dev->bus->self;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
369
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700370 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
371 pin_name(orig_pin));
372 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373}
374
Len Brown4be44fc2005-08-05 00:44:28 -0400375int acpi_pci_irq_enable(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700377 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700378 int gsi;
379 u8 pin;
Bob Moore50eca3e2005-09-30 19:03:00 -0400380 int triggering = ACPI_LEVEL_SENSITIVE;
381 int polarity = ACPI_ACTIVE_LOW;
Len Brown4be44fc2005-08-05 00:44:28 -0400382 char *link = NULL;
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600383 char link_desc[16];
Len Brown4be44fc2005-08-05 00:44:28 -0400384 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Kristen Accardi8015a012005-11-02 16:24:35 -0800386 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 if (!pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400388 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
389 "No interrupt pin configured for device %s\n",
390 pci_name(dev)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400391 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700394 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700395 if (!entry) {
Alan Cox96c2a872008-01-10 22:49:58 -0500396 /*
397 * IDE legacy mode controller IRQs are magic. Why do compat
398 * extensions always make such a nasty mess.
399 */
400 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
401 (dev->class & 0x05) == 0)
402 return 0;
403 }
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700404
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700405 if (entry) {
406 if (entry->link)
407 gsi = acpi_pci_link_allocate_irq(entry->link,
408 entry->index,
409 &triggering, &polarity,
410 &link);
411 else
412 gsi = entry->index;
413 } else
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700414 gsi = -1;
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 /*
417 * No IRQ known to the ACPI subsystem - maybe the BIOS /
418 * driver reported one, then use it. Exit in any case.
419 */
Bjorn Helgaasc13f8892008-12-08 21:30:26 -0700420 if (gsi < 0) {
Eric W. Biederman414d3442010-03-30 01:07:04 -0700421 u32 dev_gsi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 /* Interrupt Line values above 0xF are forbidden */
Eric W. Biederman414d3442010-03-30 01:07:04 -0700423 if (dev->irq > 0 && (dev->irq <= 0xF) &&
424 (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
Joe Perches66fd3832012-11-21 13:46:04 +0000425 dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n",
426 pin_name(pin), dev->irq);
Eric W. Biederman414d3442010-03-30 01:07:04 -0700427 acpi_register_gsi(&dev->dev, dev_gsi,
Yinghai Lua2f809b2009-04-27 18:01:20 -0700428 ACPI_LEVEL_SENSITIVE,
Len Brown4be44fc2005-08-05 00:44:28 -0400429 ACPI_ACTIVE_LOW);
Len Brown4be44fc2005-08-05 00:44:28 -0400430 } else {
Joe Perches66fd3832012-11-21 13:46:04 +0000431 dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
432 pin_name(pin));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 }
Yinghai Lu181380b2013-02-16 11:58:34 -0700434
Joe Perches66fd3832012-11-21 13:46:04 +0000435 return 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Yinghai Lua2f809b2009-04-27 18:01:20 -0700438 rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400439 if (rc < 0) {
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600440 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700441 pin_name(pin));
Yinghai Lu181380b2013-02-16 11:58:34 -0700442 kfree(entry);
Patrick Mocheld550d982006-06-27 00:41:40 -0400443 return rc;
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400444 }
445 dev->irq = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (link)
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600448 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
449 else
450 link_desc[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
Vincent Palatin85b85822011-12-05 11:51:18 -0800452 dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
453 pin_name(pin), link_desc, gsi,
454 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
455 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Yinghai Lu181380b2013-02-16 11:58:34 -0700457 kfree(entry);
Patrick Mocheld550d982006-06-27 00:41:40 -0400458 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
Len Brown4be44fc2005-08-05 00:44:28 -0400460
Len Brown4be44fc2005-08-05 00:44:28 -0400461void acpi_pci_irq_disable(struct pci_dev *dev)
462{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700463 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700464 int gsi;
465 u8 pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
Kristen Accardi8015a012005-11-02 16:24:35 -0800467 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 if (!pin)
Patrick Mocheld550d982006-06-27 00:41:40 -0400469 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700471 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700472 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400473 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700475 if (entry->link)
476 gsi = acpi_pci_link_free_irq(entry->link);
477 else
478 gsi = entry->index;
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700479
Yinghai Lu181380b2013-02-16 11:58:34 -0700480 kfree(entry);
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 /*
483 * TBD: It might be worth clearing dev->irq by magic constant
484 * (e.g. PCI_UNDEFINED_IRQ).
485 */
486
Vincent Palatin85b85822011-12-05 11:51:18 -0800487 dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 acpi_unregister_gsi(gsi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489}