blob: 0eefa12e648ca67f04aebaaaf0b1f3ade5095662 [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 Helgaas3604a9f2008-12-08 21:31:21 -070056static LIST_HEAD(acpi_prt_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static DEFINE_SPINLOCK(acpi_prt_lock);
58
Bjorn Helgaascf68b802008-12-08 21:30:36 -070059static inline char pin_name(int pin)
60{
Bjorn Helgaase64e9db2008-12-08 21:30:41 -070061 return 'A' + pin - 1;
Bjorn Helgaascf68b802008-12-08 21:30:36 -070062}
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064/* --------------------------------------------------------------------------
65 PCI IRQ Routing Table (PRT) Support
66 -------------------------------------------------------------------------- */
67
Bjorn Helgaas063563b2008-12-08 21:30:51 -070068static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
69 int pin)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070071 struct acpi_prt_entry *entry;
Bjorn Helgaas063563b2008-12-08 21:30:51 -070072 int segment = pci_domain_nr(dev->bus);
73 int bus = dev->bus->number;
74 int device = PCI_SLOT(dev->devfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 spin_lock(&acpi_prt_lock);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070077 list_for_each_entry(entry, &acpi_prt_list, list) {
Len Brown4be44fc2005-08-05 00:44:28 -040078 if ((segment == entry->id.segment)
79 && (bus == entry->id.bus)
80 && (device == entry->id.device)
81 && (pin == entry->pin)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 spin_unlock(&acpi_prt_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -040083 return entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 }
85 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 spin_unlock(&acpi_prt_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -040087 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070090/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
Jan Beulich609d4bc2009-03-12 11:58:25 +000091static const struct dmi_system_id medion_md9580[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070092 {
93 .ident = "Medion MD9580-F laptop",
94 .matches = {
95 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
96 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
97 },
98 },
99 { }
100};
101
102/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
Jan Beulich609d4bc2009-03-12 11:58:25 +0000103static const struct dmi_system_id dell_optiplex[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700104 {
105 .ident = "Dell Optiplex GX1",
106 .matches = {
107 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
108 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
109 },
110 },
111 { }
112};
113
114/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
Jan Beulich609d4bc2009-03-12 11:58:25 +0000115static const struct dmi_system_id hp_t5710[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700116 {
117 .ident = "HP t5710",
118 .matches = {
119 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
120 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
121 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
122 },
123 },
124 { }
125};
126
127struct prt_quirk {
Jan Beulich609d4bc2009-03-12 11:58:25 +0000128 const struct dmi_system_id *system;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700129 unsigned int segment;
130 unsigned int bus;
131 unsigned int device;
132 unsigned char pin;
Jan Beulich609d4bc2009-03-12 11:58:25 +0000133 const char *source; /* according to BIOS */
134 const char *actual_source;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700135};
136
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700137#define PCI_INTX_PIN(c) (c - 'A' + 1)
138
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700139/*
140 * These systems have incorrect _PRT entries. The BIOS claims the PCI
141 * interrupt at the listed segment/bus/device/pin is connected to the first
142 * link device, but it is actually connected to the second.
143 */
Jan Beulich609d4bc2009-03-12 11:58:25 +0000144static const struct prt_quirk prt_quirks[] = {
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700145 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
Bjorn Helgaasb97d4802008-03-25 11:21:11 -0600146 "\\_SB_.PCI0.ISA_.LNKA",
147 "\\_SB_.PCI0.ISA_.LNKB"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700148 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700149 "\\_SB_.LNKB",
150 "\\_SB_.LNKA"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700151 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700152 "\\_SB_.PCI0.LNK1",
153 "\\_SB_.PCI0.LNK3"},
154};
155
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700156static void do_prt_fixups(struct acpi_prt_entry *entry,
157 struct acpi_pci_routing_table *prt)
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700158{
159 int i;
Jan Beulich609d4bc2009-03-12 11:58:25 +0000160 const struct prt_quirk *quirk;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700161
162 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
163 quirk = &prt_quirks[i];
164
165 /* All current quirks involve link devices, not GSIs */
166 if (!prt->source)
167 continue;
168
169 if (dmi_check_system(quirk->system) &&
170 entry->id.segment == quirk->segment &&
171 entry->id.bus == quirk->bus &&
172 entry->id.device == quirk->device &&
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700173 entry->pin == quirk->pin &&
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700174 !strcmp(prt->source, quirk->source) &&
175 strlen(prt->source) >= strlen(quirk->actual_source)) {
176 printk(KERN_WARNING PREFIX "firmware reports "
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600177 "%04x:%02x:%02x PCI INT %c connected to %s; "
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700178 "changing to %s\n",
179 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700180 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700181 prt->source, quirk->actual_source);
182 strcpy(prt->source, quirk->actual_source);
183 }
184 }
185}
186
Alexander Chiang859a3f82009-06-10 19:55:35 +0000187static int acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus,
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700188 struct acpi_pci_routing_table *prt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700190 struct acpi_prt_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Burman Yan36bcbec2006-12-19 12:56:11 -0800192 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400194 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700196 /*
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
199 * it here.
200 */
Alexander Chiang859a3f82009-06-10 19:55:35 +0000201 entry->id.segment = pci_domain_nr(bus);
202 entry->id.bus = bus->number;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 entry->id.device = (prt->address >> 16) & 0xFFFF;
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700204 entry->pin = prt->pin + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700206 do_prt_fixups(entry, prt);
207
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700208 entry->index = prt->source_index;
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 /*
211 * Type 1: Dynamic
212 * ---------------
213 * The 'source' field specifies the PCI interrupt link device used to
214 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
215 * indicates which resource descriptor in the resource template (of
216 * the link device) this interrupt is allocated from.
217 *
218 * NOTE: Don't query the Link Device for IRQ information at this time
219 * because Link Device enumeration may not have occurred yet
220 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
221 * namespace).
222 */
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700223 if (prt->source[0])
224 acpi_get_handle(handle, prt->source, &entry->link);
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 /*
227 * Type 2: Static
228 * --------------
229 * The 'source' field is NULL, and the 'source_index' field specifies
230 * the IRQ value, which is hardwired to specific interrupt inputs on
231 * the interrupt controller.
232 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
Bjorn Helgaas21a53282008-12-08 21:30:05 -0700235 " %04x:%02x:%02x[%c] -> %s[%d]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400236 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700237 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700238 prt->source, entry->index));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 spin_lock(&acpi_prt_lock);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700241 list_add_tail(&entry->list, &acpi_prt_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 spin_unlock(&acpi_prt_lock);
243
Patrick Mocheld550d982006-06-27 00:41:40 -0400244 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
Alexander Chiang859a3f82009-06-10 19:55:35 +0000247int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700249 acpi_status status;
250 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
251 struct acpi_pci_routing_table *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700253 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
254 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
255 if (ACPI_FAILURE(status))
256 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700259 (char *) buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700261 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700263 buffer.length = ACPI_ALLOCATE_BUFFER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 buffer.pointer = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 status = acpi_get_irq_routing_table(handle, &buffer);
267 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400268 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
269 acpi_format_exception(status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400271 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700274 entry = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 while (entry && (entry->length > 0)) {
Alexander Chiang859a3f82009-06-10 19:55:35 +0000276 acpi_pci_irq_add_entry(handle, bus, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 entry = (struct acpi_pci_routing_table *)
Len Brown4be44fc2005-08-05 00:44:28 -0400278 ((unsigned long)entry + entry->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 }
280
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700281 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400282 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
Alexander Chiangd9efae32009-06-10 19:55:40 +0000285void acpi_pci_irq_del_prt(struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700287 struct acpi_prt_entry *entry, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Len Brown4be44fc2005-08-05 00:44:28 -0400289 printk(KERN_DEBUG
Bjorn Helgaas21a53282008-12-08 21:30:05 -0700290 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
Alexander Chiangd9efae32009-06-10 19:55:40 +0000291 pci_domain_nr(bus), bus->number);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 spin_lock(&acpi_prt_lock);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700293 list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
Alexander Chiangd9efae32009-06-10 19:55:40 +0000294 if (pci_domain_nr(bus) == entry->id.segment
295 && bus->number == entry->id.bus) {
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700296 list_del(&entry->list);
297 kfree(entry);
298 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 }
300 spin_unlock(&acpi_prt_lock);
301}
Len Brown4be44fc2005-08-05 00:44:28 -0400302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303/* --------------------------------------------------------------------------
304 PCI Interrupt Routing Support
305 -------------------------------------------------------------------------- */
Stefan Assmannd7f61692011-07-15 14:52:30 +0200306#ifdef CONFIG_X86_IO_APIC
307extern int noioapicquirk;
308extern int noioapicreroute;
309
310static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
311{
312 struct pci_bus *bus_it;
313
314 for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
315 if (!bus_it->self)
316 return 0;
317 if (bus_it->self->irq_reroute_variant)
318 return bus_it->self->irq_reroute_variant;
319 }
320 return 0;
321}
322
323/*
324 * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ
325 * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does
326 * during interrupt handling). When this INTx generation cannot be disabled,
327 * we reroute these interrupts to their legacy equivalent to get rid of
328 * spurious interrupts.
329 */
330static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
331 struct acpi_prt_entry *entry)
332{
333 if (noioapicquirk || noioapicreroute) {
334 return 0;
335 } else {
336 switch (bridge_has_boot_interrupt_variant(dev->bus)) {
337 case 0:
338 /* no rerouting necessary */
339 return 0;
340 case INTEL_IRQ_REROUTE_VARIANT:
341 /*
342 * Remap according to INTx routing table in 6700PXH
343 * specs, intel order number 302628-002, section
344 * 2.15.2. Other chipsets (80332, ...) have the same
345 * mapping and are handled here as well.
346 */
347 dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
348 "IRQ %d\n", entry->index,
349 (entry->index % 4) + 16);
350 entry->index = (entry->index % 4) + 16;
351 return 1;
352 default:
353 dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
354 "IRQ: unknown mapping\n", entry->index);
355 return -1;
356 }
357 }
358}
359#endif /* CONFIG_X86_IO_APIC */
360
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700361static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700363 struct acpi_prt_entry *entry;
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700364 struct pci_dev *bridge;
365 u8 bridge_pin, orig_pin = pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Bjorn Helgaas063563b2008-12-08 21:30:51 -0700367 entry = acpi_pci_irq_find_prt_entry(dev, pin);
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700368 if (entry) {
Stefan Assmannd7f61692011-07-15 14:52:30 +0200369#ifdef CONFIG_X86_IO_APIC
370 acpi_reroute_boot_interrupt(dev, entry);
371#endif /* CONFIG_X86_IO_APIC */
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700372 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
Bjorn Helgaas13504872008-12-08 21:30:56 -0700373 pci_name(dev), pin_name(pin)));
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700374 return entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
Len Brown4be44fc2005-08-05 00:44:28 -0400376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 /*
378 * Attempt to derive an IRQ for this device from a parent bridge's
379 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
380 */
Bjorn Helgaasee401362008-12-08 21:31:11 -0700381 bridge = dev->bus->self;
382 while (bridge) {
Bjorn Helgaasc686d142009-02-17 13:49:10 -0700383 pin = pci_swizzle_interrupt_pin(dev, pin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
386 /* PC card has the same IRQ as its cardbridge */
Kristen Accardi8015a012005-11-02 16:24:35 -0800387 bridge_pin = bridge->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (!bridge_pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400389 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
390 "No interrupt pin configured for device %s\n",
391 pci_name(bridge)));
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700392 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 pin = bridge_pin;
395 }
396
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700397 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700398 if (entry) {
399 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
400 "Derived GSI for %s INT %c from %s\n",
401 pci_name(dev), pin_name(orig_pin),
402 pci_name(bridge)));
403 return entry;
404 }
Bjorn Helgaasee401362008-12-08 21:31:11 -0700405
406 dev = bridge;
407 bridge = dev->bus->self;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 }
409
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700410 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
411 pin_name(orig_pin));
412 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414
Len Brown4be44fc2005-08-05 00:44:28 -0400415int acpi_pci_irq_enable(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700417 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700418 int gsi;
419 u8 pin;
Bob Moore50eca3e2005-09-30 19:03:00 -0400420 int triggering = ACPI_LEVEL_SENSITIVE;
421 int polarity = ACPI_ACTIVE_LOW;
Len Brown4be44fc2005-08-05 00:44:28 -0400422 char *link = NULL;
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600423 char link_desc[16];
Len Brown4be44fc2005-08-05 00:44:28 -0400424 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Kristen Accardi8015a012005-11-02 16:24:35 -0800426 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (!pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400428 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
429 "No interrupt pin configured for device %s\n",
430 pci_name(dev)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400431 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700434 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700435 if (!entry) {
Alan Cox96c2a872008-01-10 22:49:58 -0500436 /*
437 * IDE legacy mode controller IRQs are magic. Why do compat
438 * extensions always make such a nasty mess.
439 */
440 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
441 (dev->class & 0x05) == 0)
442 return 0;
443 }
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700444
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700445 if (entry) {
446 if (entry->link)
447 gsi = acpi_pci_link_allocate_irq(entry->link,
448 entry->index,
449 &triggering, &polarity,
450 &link);
451 else
452 gsi = entry->index;
453 } else
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700454 gsi = -1;
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 /*
457 * No IRQ known to the ACPI subsystem - maybe the BIOS /
458 * driver reported one, then use it. Exit in any case.
459 */
Bjorn Helgaasc13f8892008-12-08 21:30:26 -0700460 if (gsi < 0) {
Eric W. Biederman414d3442010-03-30 01:07:04 -0700461 u32 dev_gsi;
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700462 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 /* Interrupt Line values above 0xF are forbidden */
Eric W. Biederman414d3442010-03-30 01:07:04 -0700464 if (dev->irq > 0 && (dev->irq <= 0xF) &&
465 (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
466 printk(" - using ISA IRQ %d\n", dev->irq);
467 acpi_register_gsi(&dev->dev, dev_gsi,
Yinghai Lua2f809b2009-04-27 18:01:20 -0700468 ACPI_LEVEL_SENSITIVE,
Len Brown4be44fc2005-08-05 00:44:28 -0400469 ACPI_ACTIVE_LOW);
Patrick Mocheld550d982006-06-27 00:41:40 -0400470 return 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400471 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 printk("\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400473 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 }
Len Brown4be44fc2005-08-05 00:44:28 -0400475 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
Yinghai Lua2f809b2009-04-27 18:01:20 -0700477 rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400478 if (rc < 0) {
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600479 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700480 pin_name(pin));
Patrick Mocheld550d982006-06-27 00:41:40 -0400481 return rc;
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400482 }
483 dev->irq = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (link)
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600486 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
487 else
488 link_desc[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
Vincent Palatin85b85822011-12-05 11:51:18 -0800490 dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
491 pin_name(pin), link_desc, gsi,
492 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
493 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Patrick Mocheld550d982006-06-27 00:41:40 -0400495 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
Len Brown4be44fc2005-08-05 00:44:28 -0400497
David Shaohua Li87bec662005-07-27 23:02:00 -0400498/* FIXME: implement x86/x86_64 version */
Len Brown4be44fc2005-08-05 00:44:28 -0400499void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500{
Len Brown4be44fc2005-08-05 00:44:28 -0400501}
502
503void acpi_pci_irq_disable(struct pci_dev *dev)
504{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700505 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700506 int gsi;
507 u8 pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Kristen Accardi8015a012005-11-02 16:24:35 -0800509 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 if (!pin)
Patrick Mocheld550d982006-06-27 00:41:40 -0400511 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700513 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700514 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400515 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700517 if (entry->link)
518 gsi = acpi_pci_link_free_irq(entry->link);
519 else
520 gsi = entry->index;
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 /*
523 * TBD: It might be worth clearing dev->irq by magic constant
524 * (e.g. PCI_UNDEFINED_IRQ).
525 */
526
Vincent Palatin85b85822011-12-05 11:51:18 -0800527 dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 acpi_unregister_gsi(gsi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}