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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 struct acpi_prt_entry {
  45         struct list_head        node;
  46         struct acpi_pci_id      id;
  47         u8                      pin;
  48         struct {
  49                 acpi_handle             handle;
  50                 u32                     index;
  51         }                       link;
  52         u32                     irq;
  53 };
  54
  55 struct acpi_prt_list {
  56         int                     count;
  57         struct list_head        entries;
  58 };
  59
  60 static struct acpi_prt_list acpi_prt;
  61 static DEFINE_SPINLOCK(acpi_prt_lock);
  62
  63 static inline char pin_name(int pin)
  64 {
  65         return 'A' + pin - 1;
  66 }
  67
  68 /* --------------------------------------------------------------------------
  69                          PCI IRQ Routing Table (PRT) Support
  70    -------------------------------------------------------------------------- */
  71
  72 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
  73                                                           int bus,
  74                                                           int device, int pin)
  75 {
  76         struct acpi_prt_entry *entry = NULL;
  77
  78         if (!acpi_prt.count)
  79                 return NULL;
  80
  81         /*
  82          * Parse through all PRT entries looking for a match on the specified
  83          * PCI device's segment, bus, device, and pin (don't care about func).
  84          *
  85          */
  86         spin_lock(&acpi_prt_lock);
  87         list_for_each_entry(entry, &acpi_prt.entries, node) {
  88                 if ((segment == entry->id.segment)
  89                     && (bus == entry->id.bus)
  90                     && (device == entry->id.device)
  91                     && (pin == entry->pin)) {
  92                         spin_unlock(&acpi_prt_lock);
  93                         return entry;
  94                 }
  95         }
  96
  97         spin_unlock(&acpi_prt_lock);
  98         return NULL;
  99 }
 100
 101 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
 102 static struct dmi_system_id medion_md9580[] = {
 103         {
 104                 .ident = "Medion MD9580-F laptop",
 105                 .matches = {
 106                         DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
 107                         DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
 108                 },
 109         },
 110         { }
 111 };
 112
 113 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
 114 static struct dmi_system_id dell_optiplex[] = {
 115         {
 116                 .ident = "Dell Optiplex GX1",
 117                 .matches = {
 118                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 119                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
 120                 },
 121         },
 122         { }
 123 };
 124
 125 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
 126 static struct dmi_system_id hp_t5710[] = {
 127         {
 128                 .ident = "HP t5710",
 129                 .matches = {
 130                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 131                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
 132                         DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
 133                 },
 134         },
 135         { }
 136 };
 137
 138 struct prt_quirk {
 139         struct dmi_system_id    *system;
 140         unsigned int            segment;
 141         unsigned int            bus;
 142         unsigned int            device;
 143         unsigned char           pin;
 144         char                    *source;        /* according to BIOS */
 145         char                    *actual_source;
 146 };
 147
 148 #define PCI_INTX_PIN(c)         (c - 'A' + 1)
 149
 150 /*
 151  * These systems have incorrect _PRT entries.  The BIOS claims the PCI
 152  * interrupt at the listed segment/bus/device/pin is connected to the first
 153  * link device, but it is actually connected to the second.
 154  */
 155 static struct prt_quirk prt_quirks[] = {
 156         { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
 157                 "\\_SB_.PCI0.ISA_.LNKA",
 158                 "\\_SB_.PCI0.ISA_.LNKB"},
 159         { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
 160                 "\\_SB_.LNKB",
 161                 "\\_SB_.LNKA"},
 162         { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
 163                 "\\_SB_.PCI0.LNK1",
 164                 "\\_SB_.PCI0.LNK3"},
 165 };
 166
 167 static void
 168 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
 169 {
 170         int i;
 171         struct prt_quirk *quirk;
 172
 173         for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
 174                 quirk = &prt_quirks[i];
 175
 176                 /* All current quirks involve link devices, not GSIs */
 177                 if (!prt->source)
 178                         continue;
 179
 180                 if (dmi_check_system(quirk->system) &&
 181                     entry->id.segment == quirk->segment &&
 182                     entry->id.bus == quirk->bus &&
 183                     entry->id.device == quirk->device &&
 184                     entry->pin == quirk->pin &&
 185                     !strcmp(prt->source, quirk->source) &&
 186                     strlen(prt->source) >= strlen(quirk->actual_source)) {
 187                         printk(KERN_WARNING PREFIX "firmware reports "
 188                                 "%04x:%02x:%02x PCI INT %c connected to %s; "
 189                                 "changing to %s\n",
 190                                 entry->id.segment, entry->id.bus,
 191                                 entry->id.device, pin_name(entry->pin),
 192                                 prt->source, quirk->actual_source);
 193                         strcpy(prt->source, quirk->actual_source);
 194                 }
 195         }
 196 }
 197
 198 static int
 199 acpi_pci_irq_add_entry(acpi_handle handle,
 200                        int segment, int bus, struct acpi_pci_routing_table *prt)
 201 {
 202         struct acpi_prt_entry *entry = NULL;
 203
 204         entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
 205         if (!entry)
 206                 return -ENOMEM;
 207
 208         /*
 209          * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
 210          * 1=INTA, 2=INTB.  We use the PCI encoding throughout, so convert
 211          * it here.
 212          */
 213         entry->id.segment = segment;
 214         entry->id.bus = bus;
 215         entry->id.device = (prt->address >> 16) & 0xFFFF;
 216         entry->pin = prt->pin + 1;
 217
 218         do_prt_fixups(entry, prt);
 219
 220         /*
 221          * Type 1: Dynamic
 222          * ---------------
 223          * The 'source' field specifies the PCI interrupt link device used to
 224          * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
 225          * indicates which resource descriptor in the resource template (of
 226          * the link device) this interrupt is allocated from.
 227          *
 228          * NOTE: Don't query the Link Device for IRQ information at this time
 229          *       because Link Device enumeration may not have occurred yet
 230          *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
 231          *       namespace).
 232          */
 233         if (prt->source[0]) {
 234                 acpi_get_handle(handle, prt->source, &entry->link.handle);
 235                 entry->link.index = prt->source_index;
 236         }
 237         /*
 238          * Type 2: Static
 239          * --------------
 240          * The 'source' field is NULL, and the 'source_index' field specifies
 241          * the IRQ value, which is hardwired to specific interrupt inputs on
 242          * the interrupt controller.
 243          */
 244         else
 245                 entry->link.index = prt->source_index;
 246
 247         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 248                               "      %04x:%02x:%02x[%c] -> %s[%d]\n",
 249                               entry->id.segment, entry->id.bus,
 250                               entry->id.device, pin_name(entry->pin),
 251                               prt->source, entry->link.index));
 252
 253         spin_lock(&acpi_prt_lock);
 254         list_add_tail(&entry->node, &acpi_prt.entries);
 255         acpi_prt.count++;
 256         spin_unlock(&acpi_prt_lock);
 257
 258         return 0;
 259 }
 260
 261 static void
 262 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
 263 {
 264         if (segment == entry->id.segment && bus == entry->id.bus) {
 265                 acpi_prt.count--;
 266                 list_del(&entry->node);
 267                 kfree(entry);
 268         }
 269 }
 270
 271 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
 272 {
 273         acpi_status status;
 274         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 275         struct acpi_pci_routing_table *entry;
 276         static int first_time = 1;
 277
 278         if (first_time) {
 279                 acpi_prt.count = 0;
 280                 INIT_LIST_HEAD(&acpi_prt.entries);
 281                 first_time = 0;
 282         }
 283
 284         /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
 285         status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 286         if (ACPI_FAILURE(status))
 287                 return -ENODEV;
 288
 289         printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
 290                (char *) buffer.pointer);
 291
 292         kfree(buffer.pointer);
 293
 294         buffer.length = ACPI_ALLOCATE_BUFFER;
 295         buffer.pointer = NULL;
 296
 297         status = acpi_get_irq_routing_table(handle, &buffer);
 298         if (ACPI_FAILURE(status)) {
 299                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
 300                                 acpi_format_exception(status)));
 301                 kfree(buffer.pointer);
 302                 return -ENODEV;
 303         }
 304
 305         entry = buffer.pointer;
 306         while (entry && (entry->length > 0)) {
 307                 acpi_pci_irq_add_entry(handle, segment, bus, entry);
 308                 entry = (struct acpi_pci_routing_table *)
 309                     ((unsigned long)entry + entry->length);
 310         }
 311
 312         kfree(buffer.pointer);
 313         return 0;
 314 }
 315
 316 void acpi_pci_irq_del_prt(int segment, int bus)
 317 {
 318         struct list_head *node = NULL, *n = NULL;
 319         struct acpi_prt_entry *entry = NULL;
 320
 321         if (!acpi_prt.count) {
 322                 return;
 323         }
 324
 325         printk(KERN_DEBUG
 326                "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
 327                segment, bus);
 328         spin_lock(&acpi_prt_lock);
 329         list_for_each_safe(node, n, &acpi_prt.entries) {
 330                 entry = list_entry(node, struct acpi_prt_entry, node);
 331
 332                 acpi_pci_irq_del_entry(segment, bus, entry);
 333         }
 334         spin_unlock(&acpi_prt_lock);
 335 }
 336
 337 /* --------------------------------------------------------------------------
 338                           PCI Interrupt Routing Support
 339    -------------------------------------------------------------------------- */
 340 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
 341
 342 static int
 343 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
 344                       int *triggering, int *polarity, char **link)
 345 {
 346         int irq;
 347
 348
 349         if (entry->link.handle) {
 350                 irq = acpi_pci_link_allocate_irq(entry->link.handle,
 351                                                  entry->link.index, triggering,
 352                                                  polarity, link);
 353                 if (irq < 0) {
 354                         printk(KERN_WARNING PREFIX
 355                                       "Invalid IRQ link routing entry\n");
 356                         return -1;
 357                 }
 358         } else {
 359                 irq = entry->link.index;
 360                 *triggering = ACPI_LEVEL_SENSITIVE;
 361                 *polarity = ACPI_ACTIVE_LOW;
 362         }
 363
 364         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found GSI %d\n", irq));
 365         return irq;
 366 }
 367
 368 static int
 369 acpi_pci_free_irq(struct acpi_prt_entry *entry,
 370                   int *triggering, int *polarity, char **link)
 371 {
 372         int irq;
 373
 374         if (entry->link.handle) {
 375                 irq = acpi_pci_link_free_irq(entry->link.handle);
 376         } else {
 377                 irq = entry->link.index;
 378         }
 379         return irq;
 380 }
 381
 382 /*
 383  * acpi_pci_irq_lookup
 384  * success: return IRQ >= 0
 385  * failure: return -1
 386  */
 387 static int
 388 acpi_pci_irq_lookup(struct pci_bus *bus,
 389                     int device,
 390                     int pin,
 391                     int *triggering,
 392                     int *polarity, char **link, irq_lookup_func func)
 393 {
 394         struct acpi_prt_entry *entry = NULL;
 395         int segment = pci_domain_nr(bus);
 396         int bus_nr = bus->number;
 397         int ret;
 398
 399
 400         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 401                           "Searching for _PRT entry for %04x:%02x:%02x[%c]\n",
 402                           segment, bus_nr, device, pin_name(pin)));
 403
 404         entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
 405         if (!entry) {
 406                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_PRT entry not found\n"));
 407                 return -1;
 408         }
 409
 410         ret = func(entry, triggering, polarity, link);
 411         return ret;
 412 }
 413
 414 /*
 415  * acpi_pci_irq_derive
 416  * success: return IRQ >= 0
 417  * failure: return < 0
 418  */
 419 static int
 420 acpi_pci_irq_derive(struct pci_dev *dev,
 421                     int pin,
 422                     int *triggering,
 423                     int *polarity, char **link, irq_lookup_func func)
 424 {
 425         struct pci_dev *bridge = dev;
 426         int irq = -1;
 427         u8 bridge_pin = 0, orig_pin = pin;
 428
 429
 430         /*
 431          * Attempt to derive an IRQ for this device from a parent bridge's
 432          * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
 433          */
 434         while (irq < 0 && bridge->bus->self) {
 435                 pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;
 436                 bridge = bridge->bus->self;
 437
 438                 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
 439                         /* PC card has the same IRQ as its cardbridge */
 440                         bridge_pin = bridge->pin;
 441                         if (!bridge_pin) {
 442                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 443                                                   "No interrupt pin configured for device %s\n",
 444                                                   pci_name(bridge)));
 445                                 return -1;
 446                         }
 447                         pin = bridge_pin;
 448                 }
 449
 450                 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
 451                                           pin, triggering, polarity,
 452                                           link, func);
 453         }
 454
 455         if (irq < 0) {
 456                 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
 457                          pin_name(orig_pin));
 458                 return -1;
 459         }
 460
 461         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive GSI %d for device %s from %s\n",
 462                           irq, pci_name(dev), pci_name(bridge)));
 463
 464         return irq;
 465 }
 466
 467 /*
 468  * acpi_pci_irq_enable
 469  * success: return 0
 470  * failure: return < 0
 471  */
 472
 473 int acpi_pci_irq_enable(struct pci_dev *dev)
 474 {
 475         int gsi = 0;
 476         u8 pin = 0;
 477         int triggering = ACPI_LEVEL_SENSITIVE;
 478         int polarity = ACPI_ACTIVE_LOW;
 479         char *link = NULL;
 480         char link_desc[16];
 481         int rc;
 482
 483
 484         pin = dev->pin;
 485         if (!pin) {
 486                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 487                                   "No interrupt pin configured for device %s\n",
 488                                   pci_name(dev)));
 489                 return 0;
 490         }
 491
 492         /*
 493          * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
 494          * values override any BIOS-assigned IRQs set during boot.
 495          */
 496         gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
 497                                   &triggering, &polarity, &link,
 498                                   acpi_pci_allocate_irq);
 499
 500         /*
 501          * If no PRT entry was found, we'll try to derive an IRQ from the
 502          * device's parent bridge.
 503          */
 504         if (gsi < 0)
 505                 gsi = acpi_pci_irq_derive(dev, pin, &triggering,
 506                                           &polarity, &link,
 507                                           acpi_pci_allocate_irq);
 508
 509         if (gsi < 0) {
 510                 /*
 511                  * IDE legacy mode controller IRQs are magic. Why do compat
 512                  * extensions always make such a nasty mess.
 513                  */
 514                 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
 515                                 (dev->class & 0x05) == 0)
 516                         return 0;
 517         }
 518         /*
 519          * No IRQ known to the ACPI subsystem - maybe the BIOS /
 520          * driver reported one, then use it. Exit in any case.
 521          */
 522         if (gsi < 0) {
 523                 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
 524                 /* Interrupt Line values above 0xF are forbidden */
 525                 if (dev->irq > 0 && (dev->irq <= 0xF)) {
 526                         printk(" - using IRQ %d\n", dev->irq);
 527                         acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
 528                                           ACPI_ACTIVE_LOW);
 529                         return 0;
 530                 } else {
 531                         printk("\n");
 532                         return 0;
 533                 }
 534         }
 535
 536         rc = acpi_register_gsi(gsi, triggering, polarity);
 537         if (rc < 0) {
 538                 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
 539                          pin_name(pin));
 540                 return rc;
 541         }
 542         dev->irq = rc;
 543
 544         if (link)
 545                 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
 546         else
 547                 link_desc[0] = '\0';
 548
 549         dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
 550                  pin_name(pin), link_desc, gsi,
 551                  (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
 552                  (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
 553
 554         return 0;
 555 }
 556
 557 /* FIXME: implement x86/x86_64 version */
 558 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
 559 {
 560 }
 561
 562 void acpi_pci_irq_disable(struct pci_dev *dev)
 563 {
 564         int gsi = 0;
 565         u8 pin = 0;
 566         int triggering = ACPI_LEVEL_SENSITIVE;
 567         int polarity = ACPI_ACTIVE_LOW;
 568
 569
 570         pin = dev->pin;
 571         if (!pin)
 572                 return;
 573
 574         /*
 575          * First we check the PCI IRQ routing table (PRT) for an IRQ.
 576          */
 577         gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
 578                                   &triggering, &polarity, NULL,
 579                                   acpi_pci_free_irq);
 580         /*
 581          * If no PRT entry was found, we'll try to derive an IRQ from the
 582          * device's parent bridge.
 583          */
 584         if (gsi < 0)
 585                 gsi = acpi_pci_irq_derive(dev, pin,
 586                                           &triggering, &polarity, NULL,
 587                                           acpi_pci_free_irq);
 588         if (gsi < 0)
 589                 return;
 590
 591         /*
 592          * TBD: It might be worth clearing dev->irq by magic constant
 593          * (e.g. PCI_UNDEFINED_IRQ).
 594          */
 595
 596         dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
 597         acpi_unregister_gsi(gsi);
 598 }