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   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  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  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.
  14  *
  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.
  19  *
  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.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27
  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>
  35 #include <linux/pm.h>
  36 #include <linux/pci.h>
  37 #include <linux/acpi.h>
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40
  41 #define _COMPONENT              ACPI_PCI_COMPONENT
  42 ACPI_MODULE_NAME("pci_irq");
  43
  44 static struct acpi_prt_list acpi_prt;
  45 static DEFINE_SPINLOCK(acpi_prt_lock);
  46
  47 /* --------------------------------------------------------------------------
  48                          PCI IRQ Routing Table (PRT) Support
  49    -------------------------------------------------------------------------- */
  50
  51 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
  52                                                           int bus,
  53                                                           int device, int pin)
  54 {
  55         struct acpi_prt_entry *entry = NULL;
  56
  57         if (!acpi_prt.count)
  58                 return NULL;
  59
  60         /*
  61          * Parse through all PRT entries looking for a match on the specified
  62          * PCI device's segment, bus, device, and pin (don't care about func).
  63          *
  64          */
  65         spin_lock(&acpi_prt_lock);
  66         list_for_each_entry(entry, &acpi_prt.entries, node) {
  67                 if ((segment == entry->id.segment)
  68                     && (bus == entry->id.bus)
  69                     && (device == entry->id.device)
  70                     && (pin == entry->pin)) {
  71                         spin_unlock(&acpi_prt_lock);
  72                         return entry;
  73                 }
  74         }
  75
  76         spin_unlock(&acpi_prt_lock);
  77         return NULL;
  78 }
  79
  80 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
  81 static struct dmi_system_id medion_md9580[] = {
  82         {
  83                 .ident = "Medion MD9580-F laptop",
  84                 .matches = {
  85                         DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
  86                         DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
  87                 },
  88         },
  89         { }
  90 };
  91
  92 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
  93 static struct dmi_system_id dell_optiplex[] = {
  94         {
  95                 .ident = "Dell Optiplex GX1",
  96                 .matches = {
  97                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
  98                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
  99                 },
 100         },
 101         { }
 102 };
 103
 104 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
 105 static struct dmi_system_id hp_t5710[] = {
 106         {
 107                 .ident = "HP t5710",
 108                 .matches = {
 109                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 110                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
 111                         DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
 112                 },
 113         },
 114         { }
 115 };
 116
 117 struct prt_quirk {
 118         struct dmi_system_id    *system;
 119         unsigned int            segment;
 120         unsigned int            bus;
 121         unsigned int            device;
 122         unsigned char           pin;
 123         char                    *source;        /* according to BIOS */
 124         char                    *actual_source;
 125 };
 126
 127 /*
 128  * These systems have incorrect _PRT entries.  The BIOS claims the PCI
 129  * interrupt at the listed segment/bus/device/pin is connected to the first
 130  * link device, but it is actually connected to the second.
 131  */
 132 static struct prt_quirk prt_quirks[] = {
 133         { medion_md9580, 0, 0, 9, 'A',
 134                 "\\_SB_.PCI0.ISA_.LNKA",
 135                 "\\_SB_.PCI0.ISA_.LNKB"},
 136         { dell_optiplex, 0, 0, 0xd, 'A',
 137                 "\\_SB_.LNKB",
 138                 "\\_SB_.LNKA"},
 139         { hp_t5710, 0, 0, 1, 'A',
 140                 "\\_SB_.PCI0.LNK1",
 141                 "\\_SB_.PCI0.LNK3"},
 142 };
 143
 144 static void
 145 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
 146 {
 147         int i;
 148         struct prt_quirk *quirk;
 149
 150         for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
 151                 quirk = &prt_quirks[i];
 152
 153                 /* All current quirks involve link devices, not GSIs */
 154                 if (!prt->source)
 155                         continue;
 156
 157                 if (dmi_check_system(quirk->system) &&
 158                     entry->id.segment == quirk->segment &&
 159                     entry->id.bus == quirk->bus &&
 160                     entry->id.device == quirk->device &&
 161                     entry->pin + 'A' == quirk->pin &&
 162                     !strcmp(prt->source, quirk->source) &&
 163                     strlen(prt->source) >= strlen(quirk->actual_source)) {
 164                         printk(KERN_WARNING PREFIX "firmware reports "
 165                                 "%04x:%02x:%02x PCI INT %c connected to %s; "
 166                                 "changing to %s\n",
 167                                 entry->id.segment, entry->id.bus,
 168                                 entry->id.device, 'A' + entry->pin,
 169                                 prt->source, quirk->actual_source);
 170                         strcpy(prt->source, quirk->actual_source);
 171                 }
 172         }
 173 }
 174
 175 static int
 176 acpi_pci_irq_add_entry(acpi_handle handle,
 177                        int segment, int bus, struct acpi_pci_routing_table *prt)
 178 {
 179         struct acpi_prt_entry *entry = NULL;
 180
 181         entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
 182         if (!entry)
 183                 return -ENOMEM;
 184
 185         entry->id.segment = segment;
 186         entry->id.bus = bus;
 187         entry->id.device = (prt->address >> 16) & 0xFFFF;
 188         entry->id.function = prt->address & 0xFFFF;
 189         entry->pin = prt->pin;
 190
 191         do_prt_fixups(entry, prt);
 192
 193         /*
 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          */
 206         if (prt->source[0]) {
 207                 acpi_get_handle(handle, prt->source, &entry->link.handle);
 208                 entry->link.index = prt->source_index;
 209         }
 210         /*
 211          * Type 2: Static
 212          * --------------
 213          * The 'source' field is NULL, and the 'source_index' field specifies
 214          * the IRQ value, which is hardwired to specific interrupt inputs on
 215          * the interrupt controller.
 216          */
 217         else
 218                 entry->link.index = prt->source_index;
 219
 220         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 221                               "      %04x:%02x:%02x[%c] -> %s[%d]\n",
 222                               entry->id.segment, entry->id.bus,
 223                               entry->id.device, ('A' + entry->pin), prt->source,
 224                               entry->link.index));
 225
 226         spin_lock(&acpi_prt_lock);
 227         list_add_tail(&entry->node, &acpi_prt.entries);
 228         acpi_prt.count++;
 229         spin_unlock(&acpi_prt_lock);
 230
 231         return 0;
 232 }
 233
 234 static void
 235 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
 236 {
 237         if (segment == entry->id.segment && bus == entry->id.bus) {
 238                 acpi_prt.count--;
 239                 list_del(&entry->node);
 240                 kfree(entry);
 241         }
 242 }
 243
 244 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
 245 {
 246         acpi_status status;
 247         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 248         struct acpi_pci_routing_table *entry;
 249         static int first_time = 1;
 250
 251         if (first_time) {
 252                 acpi_prt.count = 0;
 253                 INIT_LIST_HEAD(&acpi_prt.entries);
 254                 first_time = 0;
 255         }
 256
 257         /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
 258         status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 259         if (ACPI_FAILURE(status))
 260                 return -ENODEV;
 261
 262         printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
 263                (char *) buffer.pointer);
 264
 265         kfree(buffer.pointer);
 266
 267         buffer.length = ACPI_ALLOCATE_BUFFER;
 268         buffer.pointer = NULL;
 269
 270         status = acpi_get_irq_routing_table(handle, &buffer);
 271         if (ACPI_FAILURE(status)) {
 272                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
 273                                 acpi_format_exception(status)));
 274                 kfree(buffer.pointer);
 275                 return -ENODEV;
 276         }
 277
 278         entry = buffer.pointer;
 279         while (entry && (entry->length > 0)) {
 280                 acpi_pci_irq_add_entry(handle, segment, bus, entry);
 281                 entry = (struct acpi_pci_routing_table *)
 282                     ((unsigned long)entry + entry->length);
 283         }
 284
 285         kfree(buffer.pointer);
 286         return 0;
 287 }
 288
 289 void acpi_pci_irq_del_prt(int segment, int bus)
 290 {
 291         struct list_head *node = NULL, *n = NULL;
 292         struct acpi_prt_entry *entry = NULL;
 293
 294         if (!acpi_prt.count) {
 295                 return;
 296         }
 297
 298         printk(KERN_DEBUG
 299                "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
 300                segment, bus);
 301         spin_lock(&acpi_prt_lock);
 302         list_for_each_safe(node, n, &acpi_prt.entries) {
 303                 entry = list_entry(node, struct acpi_prt_entry, node);
 304
 305                 acpi_pci_irq_del_entry(segment, bus, entry);
 306         }
 307         spin_unlock(&acpi_prt_lock);
 308 }
 309
 310 /* --------------------------------------------------------------------------
 311                           PCI Interrupt Routing Support
 312    -------------------------------------------------------------------------- */
 313 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
 314
 315 static int
 316 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
 317                       int *triggering, int *polarity, char **link)
 318 {
 319         int irq;
 320
 321
 322         if (entry->link.handle) {
 323                 irq = acpi_pci_link_allocate_irq(entry->link.handle,
 324                                                  entry->link.index, triggering,
 325                                                  polarity, link);
 326                 if (irq < 0) {
 327                         printk(KERN_WARNING PREFIX
 328                                       "Invalid IRQ link routing entry\n");
 329                         return -1;
 330                 }
 331         } else {
 332                 irq = entry->link.index;
 333                 *triggering = ACPI_LEVEL_SENSITIVE;
 334                 *polarity = ACPI_ACTIVE_LOW;
 335         }
 336
 337         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
 338         return irq;
 339 }
 340
 341 static int
 342 acpi_pci_free_irq(struct acpi_prt_entry *entry,
 343                   int *triggering, int *polarity, char **link)
 344 {
 345         int irq;
 346
 347         if (entry->link.handle) {
 348                 irq = acpi_pci_link_free_irq(entry->link.handle);
 349         } else {
 350                 irq = entry->link.index;
 351         }
 352         return irq;
 353 }
 354
 355 /*
 356  * acpi_pci_irq_lookup
 357  * success: return IRQ >= 0
 358  * failure: return -1
 359  */
 360 static int
 361 acpi_pci_irq_lookup(struct pci_bus *bus,
 362                     int device,
 363                     int pin,
 364                     int *triggering,
 365                     int *polarity, char **link, irq_lookup_func func)
 366 {
 367         struct acpi_prt_entry *entry = NULL;
 368         int segment = pci_domain_nr(bus);
 369         int bus_nr = bus->number;
 370         int ret;
 371
 372
 373         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 374                           "Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
 375                           segment, bus_nr, device, ('A' + pin)));
 376
 377         entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
 378         if (!entry) {
 379                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
 380                 return -1;
 381         }
 382
 383         ret = func(entry, triggering, polarity, link);
 384         return ret;
 385 }
 386
 387 /*
 388  * acpi_pci_irq_derive
 389  * success: return IRQ >= 0
 390  * failure: return < 0
 391  */
 392 static int
 393 acpi_pci_irq_derive(struct pci_dev *dev,
 394                     int pin,
 395                     int *triggering,
 396                     int *polarity, char **link, irq_lookup_func func)
 397 {
 398         struct pci_dev *bridge = dev;
 399         int irq = -1;
 400         u8 bridge_pin = 0, orig_pin = pin;
 401
 402
 403         /*
 404          * Attempt to derive an IRQ for this device from a parent bridge's
 405          * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
 406          */
 407         while (irq < 0 && bridge->bus->self) {
 408                 pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
 409                 bridge = bridge->bus->self;
 410
 411                 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
 412                         /* PC card has the same IRQ as its cardbridge */
 413                         bridge_pin = bridge->pin;
 414                         if (!bridge_pin) {
 415                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 416                                                   "No interrupt pin configured for device %s\n",
 417                                                   pci_name(bridge)));
 418                                 return -1;
 419                         }
 420                         /* Pin is from 0 to 3 */
 421                         bridge_pin--;
 422                         pin = bridge_pin;
 423                 }
 424
 425                 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
 426                                           pin, triggering, polarity,
 427                                           link, func);
 428         }
 429
 430         if (irq < 0) {
 431                 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
 432                          'A' + orig_pin);
 433                 return -1;
 434         }
 435
 436         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
 437                           irq, pci_name(dev), pci_name(bridge)));
 438
 439         return irq;
 440 }
 441
 442 /*
 443  * acpi_pci_irq_enable
 444  * success: return 0
 445  * failure: return < 0
 446  */
 447
 448 int acpi_pci_irq_enable(struct pci_dev *dev)
 449 {
 450         int irq = 0;
 451         u8 pin = 0;
 452         int triggering = ACPI_LEVEL_SENSITIVE;
 453         int polarity = ACPI_ACTIVE_LOW;
 454         char *link = NULL;
 455         char link_desc[16];
 456         int rc;
 457
 458
 459         pin = dev->pin;
 460         if (!pin) {
 461                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 462                                   "No interrupt pin configured for device %s\n",
 463                                   pci_name(dev)));
 464                 return 0;
 465         }
 466         pin--;
 467
 468         /*
 469          * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
 470          * values override any BIOS-assigned IRQs set during boot.
 471          */
 472         irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
 473                                   &triggering, &polarity, &link,
 474                                   acpi_pci_allocate_irq);
 475
 476         /*
 477          * If no PRT entry was found, we'll try to derive an IRQ from the
 478          * device's parent bridge.
 479          */
 480         if (irq < 0)
 481                 irq = acpi_pci_irq_derive(dev, pin, &triggering,
 482                                           &polarity, &link,
 483                                           acpi_pci_allocate_irq);
 484
 485         if (irq < 0) {
 486                 /*
 487                  * IDE legacy mode controller IRQs are magic. Why do compat
 488                  * extensions always make such a nasty mess.
 489                  */
 490                 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
 491                                 (dev->class & 0x05) == 0)
 492                         return 0;
 493         }
 494         /*
 495          * No IRQ known to the ACPI subsystem - maybe the BIOS /
 496          * driver reported one, then use it. Exit in any case.
 497          */
 498         if (irq < 0) {
 499                 dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin);
 500                 /* Interrupt Line values above 0xF are forbidden */
 501                 if (dev->irq > 0 && (dev->irq <= 0xF)) {
 502                         printk(" - using IRQ %d\n", dev->irq);
 503                         acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
 504                                           ACPI_ACTIVE_LOW);
 505                         return 0;
 506                 } else {
 507                         printk("\n");
 508                         return 0;
 509                 }
 510         }
 511
 512         rc = acpi_register_gsi(irq, triggering, polarity);
 513         if (rc < 0) {
 514                 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
 515                          'A' + pin);
 516                 return rc;
 517         }
 518         dev->irq = rc;
 519
 520         if (link)
 521                 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
 522         else
 523                 link_desc[0] = '\0';
 524
 525         dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
 526                  'A' + pin, link_desc, irq,
 527                  (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
 528                  (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
 529
 530         return 0;
 531 }
 532
 533 /* FIXME: implement x86/x86_64 version */
 534 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
 535 {
 536 }
 537
 538 void acpi_pci_irq_disable(struct pci_dev *dev)
 539 {
 540         int gsi = 0;
 541         u8 pin = 0;
 542         int triggering = ACPI_LEVEL_SENSITIVE;
 543         int polarity = ACPI_ACTIVE_LOW;
 544
 545
 546         pin = dev->pin;
 547         if (!pin)
 548                 return;
 549         pin--;
 550
 551         /*
 552          * First we check the PCI IRQ routing table (PRT) for an IRQ.
 553          */
 554         gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
 555                                   &triggering, &polarity, NULL,
 556                                   acpi_pci_free_irq);
 557         /*
 558          * If no PRT entry was found, we'll try to derive an IRQ from the
 559          * device's parent bridge.
 560          */
 561         if (gsi < 0)
 562                 gsi = acpi_pci_irq_derive(dev, pin,
 563                                           &triggering, &polarity, NULL,
 564                                           acpi_pci_free_irq);
 565         if (gsi < 0)
 566                 return;
 567
 568         /*
 569          * TBD: It might be worth clearing dev->irq by magic constant
 570          * (e.g. PCI_UNDEFINED_IRQ).
 571          */
 572
 573         dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin);
 574         acpi_unregister_gsi(gsi);
 575 }