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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  *  (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/proc_fs.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/pm.h>
  38 #include <linux/pci.h>
  39 #include <linux/acpi.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42
  43 #define _COMPONENT              ACPI_PCI_COMPONENT
  44 ACPI_MODULE_NAME("pci_irq");
  45
  46 struct acpi_prt_entry {
  47         struct list_head        list;
  48         struct acpi_pci_id      id;
  49         u8                      pin;
  50         acpi_handle             link;
  51         u32                     index;          /* GSI, or link _CRS index */
  52 };
  53
  54 static LIST_HEAD(acpi_prt_list);
  55 static DEFINE_SPINLOCK(acpi_prt_lock);
  56
  57 static inline char pin_name(int pin)
  58 {
  59         return 'A' + pin - 1;
  60 }
  61
  62 /* --------------------------------------------------------------------------
  63                          PCI IRQ Routing Table (PRT) Support
  64    -------------------------------------------------------------------------- */
  65
  66 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
  67                                                           int pin)
  68 {
  69         struct acpi_prt_entry *entry;
  70         int segment = pci_domain_nr(dev->bus);
  71         int bus = dev->bus->number;
  72         int device = PCI_SLOT(dev->devfn);
  73
  74         spin_lock(&acpi_prt_lock);
  75         list_for_each_entry(entry, &acpi_prt_list, list) {
  76                 if ((segment == entry->id.segment)
  77                     && (bus == entry->id.bus)
  78                     && (device == entry->id.device)
  79                     && (pin == entry->pin)) {
  80                         spin_unlock(&acpi_prt_lock);
  81                         return entry;
  82                 }
  83         }
  84         spin_unlock(&acpi_prt_lock);
  85         return NULL;
  86 }
  87
  88 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
  89 static struct dmi_system_id medion_md9580[] = {
  90         {
  91                 .ident = "Medion MD9580-F laptop",
  92                 .matches = {
  93                         DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
  94                         DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
  95                 },
  96         },
  97         { }
  98 };
  99
 100 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
 101 static struct dmi_system_id dell_optiplex[] = {
 102         {
 103                 .ident = "Dell Optiplex GX1",
 104                 .matches = {
 105                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 106                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
 107                 },
 108         },
 109         { }
 110 };
 111
 112 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
 113 static struct dmi_system_id hp_t5710[] = {
 114         {
 115                 .ident = "HP t5710",
 116                 .matches = {
 117                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 118                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
 119                         DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
 120                 },
 121         },
 122         { }
 123 };
 124
 125 struct prt_quirk {
 126         struct dmi_system_id    *system;
 127         unsigned int            segment;
 128         unsigned int            bus;
 129         unsigned int            device;
 130         unsigned char           pin;
 131         char                    *source;        /* according to BIOS */
 132         char                    *actual_source;
 133 };
 134
 135 #define PCI_INTX_PIN(c)         (c - 'A' + 1)
 136
 137 /*
 138  * These systems have incorrect _PRT entries.  The BIOS claims the PCI
 139  * interrupt at the listed segment/bus/device/pin is connected to the first
 140  * link device, but it is actually connected to the second.
 141  */
 142 static struct prt_quirk prt_quirks[] = {
 143         { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
 144                 "\\_SB_.PCI0.ISA_.LNKA",
 145                 "\\_SB_.PCI0.ISA_.LNKB"},
 146         { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
 147                 "\\_SB_.LNKB",
 148                 "\\_SB_.LNKA"},
 149         { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
 150                 "\\_SB_.PCI0.LNK1",
 151                 "\\_SB_.PCI0.LNK3"},
 152 };
 153
 154 static void do_prt_fixups(struct acpi_prt_entry *entry,
 155                           struct acpi_pci_routing_table *prt)
 156 {
 157         int i;
 158         struct prt_quirk *quirk;
 159
 160         for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
 161                 quirk = &prt_quirks[i];
 162
 163                 /* All current quirks involve link devices, not GSIs */
 164                 if (!prt->source)
 165                         continue;
 166
 167                 if (dmi_check_system(quirk->system) &&
 168                     entry->id.segment == quirk->segment &&
 169                     entry->id.bus == quirk->bus &&
 170                     entry->id.device == quirk->device &&
 171                     entry->pin == quirk->pin &&
 172                     !strcmp(prt->source, quirk->source) &&
 173                     strlen(prt->source) >= strlen(quirk->actual_source)) {
 174                         printk(KERN_WARNING PREFIX "firmware reports "
 175                                 "%04x:%02x:%02x PCI INT %c connected to %s; "
 176                                 "changing to %s\n",
 177                                 entry->id.segment, entry->id.bus,
 178                                 entry->id.device, pin_name(entry->pin),
 179                                 prt->source, quirk->actual_source);
 180                         strcpy(prt->source, quirk->actual_source);
 181                 }
 182         }
 183 }
 184
 185 static int acpi_pci_irq_add_entry(acpi_handle handle, int segment, int bus,
 186                                   struct acpi_pci_routing_table *prt)
 187 {
 188         struct acpi_prt_entry *entry;
 189
 190         entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
 191         if (!entry)
 192                 return -ENOMEM;
 193
 194         /*
 195          * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
 196          * 1=INTA, 2=INTB.  We use the PCI encoding throughout, so convert
 197          * it here.
 198          */
 199         entry->id.segment = segment;
 200         entry->id.bus = bus;
 201         entry->id.device = (prt->address >> 16) & 0xFFFF;
 202         entry->pin = prt->pin + 1;
 203
 204         do_prt_fixups(entry, prt);
 205
 206         entry->index = prt->source_index;
 207
 208         /*
 209          * Type 1: Dynamic
 210          * ---------------
 211          * The 'source' field specifies the PCI interrupt link device used to
 212          * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
 213          * indicates which resource descriptor in the resource template (of
 214          * the link device) this interrupt is allocated from.
 215          *
 216          * NOTE: Don't query the Link Device for IRQ information at this time
 217          *       because Link Device enumeration may not have occurred yet
 218          *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
 219          *       namespace).
 220          */
 221         if (prt->source[0])
 222                 acpi_get_handle(handle, prt->source, &entry->link);
 223
 224         /*
 225          * Type 2: Static
 226          * --------------
 227          * The 'source' field is NULL, and the 'source_index' field specifies
 228          * the IRQ value, which is hardwired to specific interrupt inputs on
 229          * the interrupt controller.
 230          */
 231
 232         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 233                               "      %04x:%02x:%02x[%c] -> %s[%d]\n",
 234                               entry->id.segment, entry->id.bus,
 235                               entry->id.device, pin_name(entry->pin),
 236                               prt->source, entry->index));
 237
 238         spin_lock(&acpi_prt_lock);
 239         list_add_tail(&entry->list, &acpi_prt_list);
 240         spin_unlock(&acpi_prt_lock);
 241
 242         return 0;
 243 }
 244
 245 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
 246 {
 247         acpi_status status;
 248         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 249         struct acpi_pci_routing_table *entry;
 250
 251         /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
 252         status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 253         if (ACPI_FAILURE(status))
 254                 return -ENODEV;
 255
 256         printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
 257                (char *) buffer.pointer);
 258
 259         kfree(buffer.pointer);
 260
 261         buffer.length = ACPI_ALLOCATE_BUFFER;
 262         buffer.pointer = NULL;
 263
 264         status = acpi_get_irq_routing_table(handle, &buffer);
 265         if (ACPI_FAILURE(status)) {
 266                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
 267                                 acpi_format_exception(status)));
 268                 kfree(buffer.pointer);
 269                 return -ENODEV;
 270         }
 271
 272         entry = buffer.pointer;
 273         while (entry && (entry->length > 0)) {
 274                 acpi_pci_irq_add_entry(handle, segment, bus, entry);
 275                 entry = (struct acpi_pci_routing_table *)
 276                     ((unsigned long)entry + entry->length);
 277         }
 278
 279         kfree(buffer.pointer);
 280         return 0;
 281 }
 282
 283 void acpi_pci_irq_del_prt(int segment, int bus)
 284 {
 285         struct acpi_prt_entry *entry, *tmp;
 286
 287         printk(KERN_DEBUG
 288                "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
 289                segment, bus);
 290         spin_lock(&acpi_prt_lock);
 291         list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
 292                 if (segment == entry->id.segment && bus == entry->id.bus) {
 293                         list_del(&entry->list);
 294                         kfree(entry);
 295                 }
 296         }
 297         spin_unlock(&acpi_prt_lock);
 298 }
 299
 300 /* --------------------------------------------------------------------------
 301                           PCI Interrupt Routing Support
 302    -------------------------------------------------------------------------- */
 303 static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
 304 {
 305         struct acpi_prt_entry *entry;
 306         struct pci_dev *bridge;
 307         u8 bridge_pin, orig_pin = pin;
 308
 309         entry = acpi_pci_irq_find_prt_entry(dev, pin);
 310         if (entry) {
 311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
 312                                   pci_name(dev), pin_name(pin)));
 313                 return entry;
 314         }
 315
 316         /*
 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).
 319          */
 320         bridge = dev->bus->self;
 321         while (bridge) {
 322                 pin = (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
 323
 324                 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
 325                         /* PC card has the same IRQ as its cardbridge */
 326                         bridge_pin = bridge->pin;
 327                         if (!bridge_pin) {
 328                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 329                                                   "No interrupt pin configured for device %s\n",
 330                                                   pci_name(bridge)));
 331                                 return NULL;
 332                         }
 333                         pin = bridge_pin;
 334                 }
 335
 336                 entry = acpi_pci_irq_find_prt_entry(bridge, pin);
 337                 if (entry) {
 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),
 341                                          pci_name(bridge)));
 342                         return entry;
 343                 }
 344
 345                 dev = bridge;
 346                 bridge = dev->bus->self;
 347         }
 348
 349         dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
 350                  pin_name(orig_pin));
 351         return NULL;
 352 }
 353
 354 int acpi_pci_irq_enable(struct pci_dev *dev)
 355 {
 356         struct acpi_prt_entry *entry;
 357         int gsi;
 358         u8 pin;
 359         int triggering = ACPI_LEVEL_SENSITIVE;
 360         int polarity = ACPI_ACTIVE_LOW;
 361         char *link = NULL;
 362         char link_desc[16];
 363         int rc;
 364
 365         pin = dev->pin;
 366         if (!pin) {
 367                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 368                                   "No interrupt pin configured for device %s\n",
 369                                   pci_name(dev)));
 370                 return 0;
 371         }
 372
 373         entry = acpi_pci_irq_lookup(dev, pin);
 374         if (!entry) {
 375                 /*
 376                  * IDE legacy mode controller IRQs are magic. Why do compat
 377                  * extensions always make such a nasty mess.
 378                  */
 379                 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
 380                                 (dev->class & 0x05) == 0)
 381                         return 0;
 382         }
 383
 384         if (entry) {
 385                 if (entry->link)
 386                         gsi = acpi_pci_link_allocate_irq(entry->link,
 387                                                          entry->index,
 388                                                          &triggering, &polarity,
 389                                                          &link);
 390                 else
 391                         gsi = entry->index;
 392         } else
 393                 gsi = -1;
 394
 395         /*
 396          * No IRQ known to the ACPI subsystem - maybe the BIOS /
 397          * driver reported one, then use it. Exit in any case.
 398          */
 399         if (gsi < 0) {
 400                 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
 401                 /* Interrupt Line values above 0xF are forbidden */
 402                 if (dev->irq > 0 && (dev->irq <= 0xF)) {
 403                         printk(" - using IRQ %d\n", dev->irq);
 404                         acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
 405                                           ACPI_ACTIVE_LOW);
 406                         return 0;
 407                 } else {
 408                         printk("\n");
 409                         return 0;
 410                 }
 411         }
 412
 413         rc = acpi_register_gsi(gsi, triggering, polarity);
 414         if (rc < 0) {
 415                 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
 416                          pin_name(pin));
 417                 return rc;
 418         }
 419         dev->irq = rc;
 420
 421         if (link)
 422                 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
 423         else
 424                 link_desc[0] = '\0';
 425
 426         dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
 427                  pin_name(pin), link_desc, gsi,
 428                  (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
 429                  (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
 430
 431         return 0;
 432 }
 433
 434 /* FIXME: implement x86/x86_64 version */
 435 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
 436 {
 437 }
 438
 439 void acpi_pci_irq_disable(struct pci_dev *dev)
 440 {
 441         struct acpi_prt_entry *entry;
 442         int gsi;
 443         u8 pin;
 444
 445         pin = dev->pin;
 446         if (!pin)
 447                 return;
 448
 449         entry = acpi_pci_irq_lookup(dev, pin);
 450         if (!entry)
 451                 return;
 452
 453         if (entry->link)
 454                 gsi = acpi_pci_link_free_irq(entry->link);
 455         else
 456                 gsi = entry->index;
 457
 458         /*
 459          * TBD: It might be worth clearing dev->irq by magic constant
 460          * (e.g. PCI_UNDEFINED_IRQ).
 461          */
 462
 463         dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
 464         acpi_unregister_gsi(gsi);
 465 }