Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / pci_irq.c
1 /*
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  *  (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
8  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
9  *
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
29
30 #include <linux/dmi.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/init.h>
34 #include <linux/types.h>
35 #include <linux/spinlock.h>
36 #include <linux/pm.h>
37 #include <linux/pci.h>
38 #include <linux/acpi.h>
39 #include <linux/slab.h>
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42
43 #define PREFIX "ACPI: "
44
45 #define _COMPONENT              ACPI_PCI_COMPONENT
46 ACPI_MODULE_NAME("pci_irq");
47
48 struct acpi_prt_entry {
49         struct list_head        list;
50         struct acpi_pci_id      id;
51         u8                      pin;
52         acpi_handle             link;
53         u32                     index;          /* GSI, or link _CRS index */
54 };
55
56 static LIST_HEAD(acpi_prt_list);
57 static DEFINE_SPINLOCK(acpi_prt_lock);
58
59 static inline char pin_name(int pin)
60 {
61         return 'A' + pin - 1;
62 }
63
64 /* --------------------------------------------------------------------------
65                          PCI IRQ Routing Table (PRT) Support
66    -------------------------------------------------------------------------- */
67
68 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
69                                                           int pin)
70 {
71         struct acpi_prt_entry *entry;
72         int segment = pci_domain_nr(dev->bus);
73         int bus = dev->bus->number;
74         int device = PCI_SLOT(dev->devfn);
75
76         spin_lock(&acpi_prt_lock);
77         list_for_each_entry(entry, &acpi_prt_list, list) {
78                 if ((segment == entry->id.segment)
79                     && (bus == entry->id.bus)
80                     && (device == entry->id.device)
81                     && (pin == entry->pin)) {
82                         spin_unlock(&acpi_prt_lock);
83                         return entry;
84                 }
85         }
86         spin_unlock(&acpi_prt_lock);
87         return NULL;
88 }
89
90 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
91 static const struct dmi_system_id medion_md9580[] = {
92         {
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 */
103 static const struct dmi_system_id dell_optiplex[] = {
104         {
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 */
115 static const struct dmi_system_id hp_t5710[] = {
116         {
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
127 struct prt_quirk {
128         const struct dmi_system_id *system;
129         unsigned int            segment;
130         unsigned int            bus;
131         unsigned int            device;
132         unsigned char           pin;
133         const char              *source;        /* according to BIOS */
134         const char              *actual_source;
135 };
136
137 #define PCI_INTX_PIN(c)         (c - 'A' + 1)
138
139 /*
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  */
144 static const struct prt_quirk prt_quirks[] = {
145         { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
146                 "\\_SB_.PCI0.ISA_.LNKA",
147                 "\\_SB_.PCI0.ISA_.LNKB"},
148         { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
149                 "\\_SB_.LNKB",
150                 "\\_SB_.LNKA"},
151         { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
152                 "\\_SB_.PCI0.LNK1",
153                 "\\_SB_.PCI0.LNK3"},
154 };
155
156 static void do_prt_fixups(struct acpi_prt_entry *entry,
157                           struct acpi_pci_routing_table *prt)
158 {
159         int i;
160         const struct prt_quirk *quirk;
161
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 &&
173                     entry->pin == quirk->pin &&
174                     !strcmp(prt->source, quirk->source) &&
175                     strlen(prt->source) >= strlen(quirk->actual_source)) {
176                         printk(KERN_WARNING PREFIX "firmware reports "
177                                 "%04x:%02x:%02x PCI INT %c connected to %s; "
178                                 "changing to %s\n",
179                                 entry->id.segment, entry->id.bus,
180                                 entry->id.device, pin_name(entry->pin),
181                                 prt->source, quirk->actual_source);
182                         strcpy(prt->source, quirk->actual_source);
183                 }
184         }
185 }
186
187 static int acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus,
188                                   struct acpi_pci_routing_table *prt)
189 {
190         struct acpi_prt_entry *entry;
191
192         entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
193         if (!entry)
194                 return -ENOMEM;
195
196         /*
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          */
201         entry->id.segment = pci_domain_nr(bus);
202         entry->id.bus = bus->number;
203         entry->id.device = (prt->address >> 16) & 0xFFFF;
204         entry->pin = prt->pin + 1;
205
206         do_prt_fixups(entry, prt);
207
208         entry->index = prt->source_index;
209
210         /*
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          */
223         if (prt->source[0])
224                 acpi_get_handle(handle, prt->source, &entry->link);
225
226         /*
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          */
233
234         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
235                               "      %04x:%02x:%02x[%c] -> %s[%d]\n",
236                               entry->id.segment, entry->id.bus,
237                               entry->id.device, pin_name(entry->pin),
238                               prt->source, entry->index));
239
240         spin_lock(&acpi_prt_lock);
241         list_add_tail(&entry->list, &acpi_prt_list);
242         spin_unlock(&acpi_prt_lock);
243
244         return 0;
245 }
246
247 int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *bus)
248 {
249         acpi_status status;
250         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
251         struct acpi_pci_routing_table *entry;
252
253         /* '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;
257
258         printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
259                (char *) buffer.pointer);
260
261         kfree(buffer.pointer);
262
263         buffer.length = ACPI_ALLOCATE_BUFFER;
264         buffer.pointer = NULL;
265
266         status = acpi_get_irq_routing_table(handle, &buffer);
267         if (ACPI_FAILURE(status)) {
268                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
269                                 acpi_format_exception(status)));
270                 kfree(buffer.pointer);
271                 return -ENODEV;
272         }
273
274         entry = buffer.pointer;
275         while (entry && (entry->length > 0)) {
276                 acpi_pci_irq_add_entry(handle, bus, entry);
277                 entry = (struct acpi_pci_routing_table *)
278                     ((unsigned long)entry + entry->length);
279         }
280
281         kfree(buffer.pointer);
282         return 0;
283 }
284
285 void acpi_pci_irq_del_prt(struct pci_bus *bus)
286 {
287         struct acpi_prt_entry *entry, *tmp;
288
289         printk(KERN_DEBUG
290                "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
291                pci_domain_nr(bus), bus->number);
292         spin_lock(&acpi_prt_lock);
293         list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
294                 if (pci_domain_nr(bus) == entry->id.segment
295                         && bus->number == entry->id.bus) {
296                         list_del(&entry->list);
297                         kfree(entry);
298                 }
299         }
300         spin_unlock(&acpi_prt_lock);
301 }
302
303 /* --------------------------------------------------------------------------
304                           PCI Interrupt Routing Support
305    -------------------------------------------------------------------------- */
306 #ifdef CONFIG_X86_IO_APIC
307 extern int noioapicquirk;
308 extern int noioapicreroute;
309
310 static 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  */
330 static 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
361 static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
362 {
363         struct acpi_prt_entry *entry;
364         struct pci_dev *bridge;
365         u8 bridge_pin, orig_pin = pin;
366
367         entry = acpi_pci_irq_find_prt_entry(dev, pin);
368         if (entry) {
369 #ifdef CONFIG_X86_IO_APIC
370                 acpi_reroute_boot_interrupt(dev, entry);
371 #endif /* CONFIG_X86_IO_APIC */
372                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
373                                   pci_name(dev), pin_name(pin)));
374                 return entry;
375         }
376
377         /* 
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          */
381         bridge = dev->bus->self;
382         while (bridge) {
383                 pin = pci_swizzle_interrupt_pin(dev, pin);
384
385                 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
386                         /* PC card has the same IRQ as its cardbridge */
387                         bridge_pin = bridge->pin;
388                         if (!bridge_pin) {
389                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
390                                                   "No interrupt pin configured for device %s\n",
391                                                   pci_name(bridge)));
392                                 return NULL;
393                         }
394                         pin = bridge_pin;
395                 }
396
397                 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
398                 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                 }
405
406                 dev = bridge;
407                 bridge = dev->bus->self;
408         }
409
410         dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
411                  pin_name(orig_pin));
412         return NULL;
413 }
414
415 int acpi_pci_irq_enable(struct pci_dev *dev)
416 {
417         struct acpi_prt_entry *entry;
418         int gsi;
419         u8 pin;
420         int triggering = ACPI_LEVEL_SENSITIVE;
421         int polarity = ACPI_ACTIVE_LOW;
422         char *link = NULL;
423         char link_desc[16];
424         int rc;
425
426         pin = dev->pin;
427         if (!pin) {
428                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
429                                   "No interrupt pin configured for device %s\n",
430                                   pci_name(dev)));
431                 return 0;
432         }
433
434         entry = acpi_pci_irq_lookup(dev, pin);
435         if (!entry) {
436                 /*
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         }
444
445         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
454                 gsi = -1;
455
456         /*
457          * No IRQ known to the ACPI subsystem - maybe the BIOS / 
458          * driver reported one, then use it. Exit in any case.
459          */
460         if (gsi < 0) {
461                 u32 dev_gsi;
462                 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
463                 /* Interrupt Line values above 0xF are forbidden */
464                 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,
468                                           ACPI_LEVEL_SENSITIVE,
469                                           ACPI_ACTIVE_LOW);
470                         return 0;
471                 } else {
472                         printk("\n");
473                         return 0;
474                 }
475         }
476
477         rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
478         if (rc < 0) {
479                 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
480                          pin_name(pin));
481                 return rc;
482         }
483         dev->irq = rc;
484
485         if (link)
486                 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
487         else
488                 link_desc[0] = '\0';
489
490         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);
494
495         return 0;
496 }
497
498 /* FIXME: implement x86/x86_64 version */
499 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
500 {
501 }
502
503 void acpi_pci_irq_disable(struct pci_dev *dev)
504 {
505         struct acpi_prt_entry *entry;
506         int gsi;
507         u8 pin;
508
509         pin = dev->pin;
510         if (!pin)
511                 return;
512
513         entry = acpi_pci_irq_lookup(dev, pin);
514         if (!entry)
515                 return;
516
517         if (entry->link)
518                 gsi = acpi_pci_link_free_irq(entry->link);
519         else
520                 gsi = entry->index;
521
522         /*
523          * TBD: It might be worth clearing dev->irq by magic constant
524          * (e.g. PCI_UNDEFINED_IRQ).
525          */
526
527         dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
528         acpi_unregister_gsi(gsi);
529 }