2 * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 #include <linux/dmi.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <linux/proc_fs.h>
34 #include <linux/spinlock.h>
36 #include <linux/pci.h>
37 #include <linux/acpi.h>
38 #include <acpi/acpi_bus.h>
39 #include <acpi/acpi_drivers.h>
41 #define _COMPONENT ACPI_PCI_COMPONENT
42 ACPI_MODULE_NAME("pci_irq");
44 struct acpi_prt_entry {
45 struct list_head list;
46 struct acpi_pci_id id;
49 u32 index; /* GSI, or link _CRS index */
52 static LIST_HEAD(acpi_prt_list);
53 static DEFINE_SPINLOCK(acpi_prt_lock);
55 static inline char pin_name(int pin)
60 /* --------------------------------------------------------------------------
61 PCI IRQ Routing Table (PRT) Support
62 -------------------------------------------------------------------------- */
64 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
67 struct acpi_prt_entry *entry;
68 int segment = pci_domain_nr(dev->bus);
69 int bus = dev->bus->number;
70 int device = PCI_SLOT(dev->devfn);
72 spin_lock(&acpi_prt_lock);
73 list_for_each_entry(entry, &acpi_prt_list, list) {
74 if ((segment == entry->id.segment)
75 && (bus == entry->id.bus)
76 && (device == entry->id.device)
77 && (pin == entry->pin)) {
78 spin_unlock(&acpi_prt_lock);
82 spin_unlock(&acpi_prt_lock);
86 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
87 static struct dmi_system_id medion_md9580[] = {
89 .ident = "Medion MD9580-F laptop",
91 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
92 DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
98 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
99 static struct dmi_system_id dell_optiplex[] = {
101 .ident = "Dell Optiplex GX1",
103 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
104 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
110 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
111 static struct dmi_system_id hp_t5710[] = {
115 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
116 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
117 DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
124 struct dmi_system_id *system;
125 unsigned int segment;
129 char *source; /* according to BIOS */
133 #define PCI_INTX_PIN(c) (c - 'A' + 1)
136 * These systems have incorrect _PRT entries. The BIOS claims the PCI
137 * interrupt at the listed segment/bus/device/pin is connected to the first
138 * link device, but it is actually connected to the second.
140 static struct prt_quirk prt_quirks[] = {
141 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
142 "\\_SB_.PCI0.ISA_.LNKA",
143 "\\_SB_.PCI0.ISA_.LNKB"},
144 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
147 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
153 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
156 struct prt_quirk *quirk;
158 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
159 quirk = &prt_quirks[i];
161 /* All current quirks involve link devices, not GSIs */
165 if (dmi_check_system(quirk->system) &&
166 entry->id.segment == quirk->segment &&
167 entry->id.bus == quirk->bus &&
168 entry->id.device == quirk->device &&
169 entry->pin == quirk->pin &&
170 !strcmp(prt->source, quirk->source) &&
171 strlen(prt->source) >= strlen(quirk->actual_source)) {
172 printk(KERN_WARNING PREFIX "firmware reports "
173 "%04x:%02x:%02x PCI INT %c connected to %s; "
175 entry->id.segment, entry->id.bus,
176 entry->id.device, pin_name(entry->pin),
177 prt->source, quirk->actual_source);
178 strcpy(prt->source, quirk->actual_source);
184 acpi_pci_irq_add_entry(acpi_handle handle,
185 int segment, int bus, struct acpi_pci_routing_table *prt)
187 struct acpi_prt_entry *entry;
189 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
194 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
195 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
198 entry->id.segment = segment;
200 entry->id.device = (prt->address >> 16) & 0xFFFF;
201 entry->pin = prt->pin + 1;
203 do_prt_fixups(entry, prt);
205 entry->index = prt->source_index;
210 * The 'source' field specifies the PCI interrupt link device used to
211 * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
212 * indicates which resource descriptor in the resource template (of
213 * the link device) this interrupt is allocated from.
215 * NOTE: Don't query the Link Device for IRQ information at this time
216 * because Link Device enumeration may not have occurred yet
217 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
221 acpi_get_handle(handle, prt->source, &entry->link);
226 * The 'source' field is NULL, and the 'source_index' field specifies
227 * the IRQ value, which is hardwired to specific interrupt inputs on
228 * the interrupt controller.
231 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
232 " %04x:%02x:%02x[%c] -> %s[%d]\n",
233 entry->id.segment, entry->id.bus,
234 entry->id.device, pin_name(entry->pin),
235 prt->source, entry->index));
237 spin_lock(&acpi_prt_lock);
238 list_add_tail(&entry->list, &acpi_prt_list);
239 spin_unlock(&acpi_prt_lock);
244 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
247 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
248 struct acpi_pci_routing_table *entry;
250 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
251 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
252 if (ACPI_FAILURE(status))
255 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
256 (char *) buffer.pointer);
258 kfree(buffer.pointer);
260 buffer.length = ACPI_ALLOCATE_BUFFER;
261 buffer.pointer = NULL;
263 status = acpi_get_irq_routing_table(handle, &buffer);
264 if (ACPI_FAILURE(status)) {
265 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
266 acpi_format_exception(status)));
267 kfree(buffer.pointer);
271 entry = buffer.pointer;
272 while (entry && (entry->length > 0)) {
273 acpi_pci_irq_add_entry(handle, segment, bus, entry);
274 entry = (struct acpi_pci_routing_table *)
275 ((unsigned long)entry + entry->length);
278 kfree(buffer.pointer);
282 void acpi_pci_irq_del_prt(int segment, int bus)
284 struct acpi_prt_entry *entry, *tmp;
287 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
289 spin_lock(&acpi_prt_lock);
290 list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
291 if (segment == entry->id.segment && bus == entry->id.bus) {
292 list_del(&entry->list);
296 spin_unlock(&acpi_prt_lock);
299 /* --------------------------------------------------------------------------
300 PCI Interrupt Routing Support
301 -------------------------------------------------------------------------- */
302 static struct acpi_prt_entry *
303 acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
305 struct acpi_prt_entry *entry;
306 struct pci_dev *bridge;
307 u8 bridge_pin, orig_pin = pin;
309 entry = acpi_pci_irq_find_prt_entry(dev, pin);
311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
312 pci_name(dev), pin_name(pin)));
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).
320 bridge = dev->bus->self;
322 pin = (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
324 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
325 /* PC card has the same IRQ as its cardbridge */
326 bridge_pin = bridge->pin;
328 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
329 "No interrupt pin configured for device %s\n",
336 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
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),
346 bridge = dev->bus->self;
349 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
355 * acpi_pci_irq_enable
357 * failure: return < 0
360 int acpi_pci_irq_enable(struct pci_dev *dev)
362 struct acpi_prt_entry *entry;
365 int triggering = ACPI_LEVEL_SENSITIVE;
366 int polarity = ACPI_ACTIVE_LOW;
374 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
375 "No interrupt pin configured for device %s\n",
380 entry = acpi_pci_irq_lookup(dev, pin);
383 * IDE legacy mode controller IRQs are magic. Why do compat
384 * extensions always make such a nasty mess.
386 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
387 (dev->class & 0x05) == 0)
393 gsi = acpi_pci_link_allocate_irq(entry->link,
395 &triggering, &polarity,
403 * No IRQ known to the ACPI subsystem - maybe the BIOS /
404 * driver reported one, then use it. Exit in any case.
407 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
408 /* Interrupt Line values above 0xF are forbidden */
409 if (dev->irq > 0 && (dev->irq <= 0xF)) {
410 printk(" - using IRQ %d\n", dev->irq);
411 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
420 rc = acpi_register_gsi(gsi, triggering, polarity);
422 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
429 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
433 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
434 pin_name(pin), link_desc, gsi,
435 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
436 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
441 /* FIXME: implement x86/x86_64 version */
442 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
446 void acpi_pci_irq_disable(struct pci_dev *dev)
448 struct acpi_prt_entry *entry;
457 entry = acpi_pci_irq_lookup(dev, pin);
462 gsi = acpi_pci_link_free_irq(entry->link);
467 * TBD: It might be worth clearing dev->irq by magic constant
468 * (e.g. PCI_UNDEFINED_IRQ).
471 dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
472 acpi_unregister_gsi(gsi);