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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        list;
  46         struct acpi_pci_id      id;
  47         u8                      pin;
  48         acpi_handle             link;
  49         u32                     index;          /* GSI, or link _CRS index */
  50 };
  51
  52 static LIST_HEAD(acpi_prt_list);
  53 static DEFINE_SPINLOCK(acpi_prt_lock);
  54
  55 static inline char pin_name(int pin)
  56 {
  57         return 'A' + pin - 1;
  58 }
  59
  60 /* --------------------------------------------------------------------------
  61                          PCI IRQ Routing Table (PRT) Support
  62    -------------------------------------------------------------------------- */
  63
  64 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
  65                                                           int pin)
  66 {
  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);
  71
  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);
  79                         return entry;
  80                 }
  81         }
  82         spin_unlock(&acpi_prt_lock);
  83         return NULL;
  84 }
  85
  86 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
  87 static struct dmi_system_id medion_md9580[] = {
  88         {
  89                 .ident = "Medion MD9580-F laptop",
  90                 .matches = {
  91                         DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
  92                         DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
  93                 },
  94         },
  95         { }
  96 };
  97
  98 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
  99 static struct dmi_system_id dell_optiplex[] = {
 100         {
 101                 .ident = "Dell Optiplex GX1",
 102                 .matches = {
 103                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 104                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
 105                 },
 106         },
 107         { }
 108 };
 109
 110 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
 111 static struct dmi_system_id hp_t5710[] = {
 112         {
 113                 .ident = "HP t5710",
 114                 .matches = {
 115                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 116                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
 117                         DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
 118                 },
 119         },
 120         { }
 121 };
 122
 123 struct prt_quirk {
 124         struct dmi_system_id    *system;
 125         unsigned int            segment;
 126         unsigned int            bus;
 127         unsigned int            device;
 128         unsigned char           pin;
 129         char                    *source;        /* according to BIOS */
 130         char                    *actual_source;
 131 };
 132
 133 #define PCI_INTX_PIN(c)         (c - 'A' + 1)
 134
 135 /*
 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.
 139  */
 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'),
 145                 "\\_SB_.LNKB",
 146                 "\\_SB_.LNKA"},
 147         { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
 148                 "\\_SB_.PCI0.LNK1",
 149                 "\\_SB_.PCI0.LNK3"},
 150 };
 151
 152 static void do_prt_fixups(struct acpi_prt_entry *entry,
 153                           struct acpi_pci_routing_table *prt)
 154 {
 155         int i;
 156         struct prt_quirk *quirk;
 157
 158         for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
 159                 quirk = &prt_quirks[i];
 160
 161                 /* All current quirks involve link devices, not GSIs */
 162                 if (!prt->source)
 163                         continue;
 164
 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; "
 174                                 "changing to %s\n",
 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);
 179                 }
 180         }
 181 }
 182
 183 static int acpi_pci_irq_add_entry(acpi_handle handle, int segment, int bus,
 184                                   struct acpi_pci_routing_table *prt)
 185 {
 186         struct acpi_prt_entry *entry;
 187
 188         entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
 189         if (!entry)
 190                 return -ENOMEM;
 191
 192         /*
 193          * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
 194          * 1=INTA, 2=INTB.  We use the PCI encoding throughout, so convert
 195          * it here.
 196          */
 197         entry->id.segment = segment;
 198         entry->id.bus = bus;
 199         entry->id.device = (prt->address >> 16) & 0xFFFF;
 200         entry->pin = prt->pin + 1;
 201
 202         do_prt_fixups(entry, prt);
 203
 204         entry->index = prt->source_index;
 205
 206         /*
 207          * Type 1: Dynamic
 208          * ---------------
 209          * The 'source' field specifies the PCI interrupt link device used to
 210          * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
 211          * indicates which resource descriptor in the resource template (of
 212          * the link device) this interrupt is allocated from.
 213          *
 214          * NOTE: Don't query the Link Device for IRQ information at this time
 215          *       because Link Device enumeration may not have occurred yet
 216          *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
 217          *       namespace).
 218          */
 219         if (prt->source[0])
 220                 acpi_get_handle(handle, prt->source, &entry->link);
 221
 222         /*
 223          * Type 2: Static
 224          * --------------
 225          * The 'source' field is NULL, and the 'source_index' field specifies
 226          * the IRQ value, which is hardwired to specific interrupt inputs on
 227          * the interrupt controller.
 228          */
 229
 230         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 231                               "      %04x:%02x:%02x[%c] -> %s[%d]\n",
 232                               entry->id.segment, entry->id.bus,
 233                               entry->id.device, pin_name(entry->pin),
 234                               prt->source, entry->index));
 235
 236         spin_lock(&acpi_prt_lock);
 237         list_add_tail(&entry->list, &acpi_prt_list);
 238         spin_unlock(&acpi_prt_lock);
 239
 240         return 0;
 241 }
 242
 243 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
 244 {
 245         acpi_status status;
 246         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 247         struct acpi_pci_routing_table *entry;
 248
 249         /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
 250         status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 251         if (ACPI_FAILURE(status))
 252                 return -ENODEV;
 253
 254         printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
 255                (char *) buffer.pointer);
 256
 257         kfree(buffer.pointer);
 258
 259         buffer.length = ACPI_ALLOCATE_BUFFER;
 260         buffer.pointer = NULL;
 261
 262         status = acpi_get_irq_routing_table(handle, &buffer);
 263         if (ACPI_FAILURE(status)) {
 264                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
 265                                 acpi_format_exception(status)));
 266                 kfree(buffer.pointer);
 267                 return -ENODEV;
 268         }
 269
 270         entry = buffer.pointer;
 271         while (entry && (entry->length > 0)) {
 272                 acpi_pci_irq_add_entry(handle, segment, bus, entry);
 273                 entry = (struct acpi_pci_routing_table *)
 274                     ((unsigned long)entry + entry->length);
 275         }
 276
 277         kfree(buffer.pointer);
 278         return 0;
 279 }
 280
 281 void acpi_pci_irq_del_prt(int segment, int bus)
 282 {
 283         struct acpi_prt_entry *entry, *tmp;
 284
 285         printk(KERN_DEBUG
 286                "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
 287                segment, bus);
 288         spin_lock(&acpi_prt_lock);
 289         list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
 290                 if (segment == entry->id.segment && bus == entry->id.bus) {
 291                         list_del(&entry->list);
 292                         kfree(entry);
 293                 }
 294         }
 295         spin_unlock(&acpi_prt_lock);
 296 }
 297
 298 /* --------------------------------------------------------------------------
 299                           PCI Interrupt Routing Support
 300    -------------------------------------------------------------------------- */
 301 static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
 302 {
 303         struct acpi_prt_entry *entry;
 304         struct pci_dev *bridge;
 305         u8 bridge_pin, orig_pin = pin;
 306
 307         entry = acpi_pci_irq_find_prt_entry(dev, pin);
 308         if (entry) {
 309                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
 310                                   pci_name(dev), pin_name(pin)));
 311                 return entry;
 312         }
 313
 314         /*
 315          * Attempt to derive an IRQ for this device from a parent bridge's
 316          * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
 317          */
 318         bridge = dev->bus->self;
 319         while (bridge) {
 320                 pin = (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
 321
 322                 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
 323                         /* PC card has the same IRQ as its cardbridge */
 324                         bridge_pin = bridge->pin;
 325                         if (!bridge_pin) {
 326                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 327                                                   "No interrupt pin configured for device %s\n",
 328                                                   pci_name(bridge)));
 329                                 return NULL;
 330                         }
 331                         pin = bridge_pin;
 332                 }
 333
 334                 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
 335                 if (entry) {
 336                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 337                                          "Derived GSI for %s INT %c from %s\n",
 338                                          pci_name(dev), pin_name(orig_pin),
 339                                          pci_name(bridge)));
 340                         return entry;
 341                 }
 342
 343                 dev = bridge;
 344                 bridge = dev->bus->self;
 345         }
 346
 347         dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
 348                  pin_name(orig_pin));
 349         return NULL;
 350 }
 351
 352 int acpi_pci_irq_enable(struct pci_dev *dev)
 353 {
 354         struct acpi_prt_entry *entry;
 355         int gsi;
 356         u8 pin;
 357         int triggering = ACPI_LEVEL_SENSITIVE;
 358         int polarity = ACPI_ACTIVE_LOW;
 359         char *link = NULL;
 360         char link_desc[16];
 361         int rc;
 362
 363         pin = dev->pin;
 364         if (!pin) {
 365                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 366                                   "No interrupt pin configured for device %s\n",
 367                                   pci_name(dev)));
 368                 return 0;
 369         }
 370
 371         entry = acpi_pci_irq_lookup(dev, pin);
 372         if (!entry) {
 373                 /*
 374                  * IDE legacy mode controller IRQs are magic. Why do compat
 375                  * extensions always make such a nasty mess.
 376                  */
 377                 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
 378                                 (dev->class & 0x05) == 0)
 379                         return 0;
 380         }
 381
 382         if (entry) {
 383                 if (entry->link)
 384                         gsi = acpi_pci_link_allocate_irq(entry->link,
 385                                                          entry->index,
 386                                                          &triggering, &polarity,
 387                                                          &link);
 388                 else
 389                         gsi = entry->index;
 390         } else
 391                 gsi = -1;
 392
 393         /*
 394          * No IRQ known to the ACPI subsystem - maybe the BIOS /
 395          * driver reported one, then use it. Exit in any case.
 396          */
 397         if (gsi < 0) {
 398                 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
 399                 /* Interrupt Line values above 0xF are forbidden */
 400                 if (dev->irq > 0 && (dev->irq <= 0xF)) {
 401                         printk(" - using IRQ %d\n", dev->irq);
 402                         acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
 403                                           ACPI_ACTIVE_LOW);
 404                         return 0;
 405                 } else {
 406                         printk("\n");
 407                         return 0;
 408                 }
 409         }
 410
 411         rc = acpi_register_gsi(gsi, triggering, polarity);
 412         if (rc < 0) {
 413                 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
 414                          pin_name(pin));
 415                 return rc;
 416         }
 417         dev->irq = rc;
 418
 419         if (link)
 420                 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
 421         else
 422                 link_desc[0] = '\0';
 423
 424         dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
 425                  pin_name(pin), link_desc, gsi,
 426                  (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
 427                  (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
 428
 429         return 0;
 430 }
 431
 432 /* FIXME: implement x86/x86_64 version */
 433 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
 434 {
 435 }
 436
 437 void acpi_pci_irq_disable(struct pci_dev *dev)
 438 {
 439         struct acpi_prt_entry *entry;
 440         int gsi;
 441         u8 pin;
 442
 443         pin = dev->pin;
 444         if (!pin)
 445                 return;
 446
 447         entry = acpi_pci_irq_lookup(dev, pin);
 448         if (!entry)
 449                 return;
 450
 451         if (entry->link)
 452                 gsi = acpi_pci_link_free_irq(entry->link);
 453         else
 454                 gsi = entry->index;
 455
 456         /*
 457          * TBD: It might be worth clearing dev->irq by magic constant
 458          * (e.g. PCI_UNDEFINED_IRQ).
 459          */
 460
 461         dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
 462         acpi_unregister_gsi(gsi);
 463 }