drivers/acpi/pci_link.c

   1 /*
   2  *  pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
   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  * TBD:
  27  *      1. Support more than one IRQ resource entry per link device (index).
  28  *      2. Implement start/stop mechanism and use ACPI Bus Driver facilities
  29  *         for IRQ management (e.g. start()->_SRS).
  30  */
  31
  32 #include <linux/sysdev.h>
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/types.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/pm.h>
  40 #include <linux/pci.h>
  41
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44
  45
  46 #define _COMPONENT              ACPI_PCI_COMPONENT
  47 ACPI_MODULE_NAME                ("pci_link")
  48
  49 #define ACPI_PCI_LINK_CLASS             "pci_irq_routing"
  50 #define ACPI_PCI_LINK_HID               "PNP0C0F"
  51 #define ACPI_PCI_LINK_DRIVER_NAME       "ACPI PCI Interrupt Link Driver"
  52 #define ACPI_PCI_LINK_DEVICE_NAME       "PCI Interrupt Link"
  53 #define ACPI_PCI_LINK_FILE_INFO         "info"
  54 #define ACPI_PCI_LINK_FILE_STATUS       "state"
  55
  56 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
  57
  58 static int acpi_pci_link_add (struct acpi_device *device);
  59 static int acpi_pci_link_remove (struct acpi_device *device, int type);
  60
  61 static struct acpi_driver acpi_pci_link_driver = {
  62         .name =         ACPI_PCI_LINK_DRIVER_NAME,
  63         .class =        ACPI_PCI_LINK_CLASS,
  64         .ids =          ACPI_PCI_LINK_HID,
  65         .ops =          {
  66                                 .add =    acpi_pci_link_add,
  67                                 .remove = acpi_pci_link_remove,
  68                         },
  69 };
  70
  71 struct acpi_pci_link_irq {
  72         u8                      active;                 /* Current IRQ */
  73         u8                      edge_level;             /* All IRQs */
  74         u8                      active_high_low;        /* All IRQs */
  75         u8                      initialized;
  76         u8                      resource_type;
  77         u8                      possible_count;
  78         u8                      possible[ACPI_PCI_LINK_MAX_POSSIBLE];
  79 };
  80
  81 struct acpi_pci_link {
  82         struct list_head        node;
  83         struct acpi_device      *device;
  84         acpi_handle             handle;
  85         struct acpi_pci_link_irq irq;
  86 };
  87
  88 static struct {
  89         int                     count;
  90         struct list_head        entries;
  91 }                               acpi_link;
  92
  93
  94 /* --------------------------------------------------------------------------
  95                             PCI Link Device Management
  96    -------------------------------------------------------------------------- */
  97
  98 /*
  99  * set context (link) possible list from resource list
 100  */
 101 static acpi_status
 102 acpi_pci_link_check_possible (
 103         struct acpi_resource    *resource,
 104         void                    *context)
 105 {
 106         struct acpi_pci_link    *link = (struct acpi_pci_link *) context;
 107         u32                     i = 0;
 108
 109         ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
 110
 111         switch (resource->id) {
 112         case ACPI_RSTYPE_START_DPF:
 113                 return AE_OK;
 114         case ACPI_RSTYPE_IRQ:
 115         {
 116                 struct acpi_resource_irq *p = &resource->data.irq;
 117                 if (!p || !p->number_of_interrupts) {
 118                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank IRQ resource\n"));
 119                         return AE_OK;
 120                 }
 121                 for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
 122                         if (!p->interrupts[i]) {
 123                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i]));
 124                                 continue;
 125                         }
 126                         link->irq.possible[i] = p->interrupts[i];
 127                         link->irq.possible_count++;
 128                 }
 129                 link->irq.edge_level = p->edge_level;
 130                 link->irq.active_high_low = p->active_high_low;
 131                 link->irq.resource_type = ACPI_RSTYPE_IRQ;
 132                 break;
 133         }
 134         case ACPI_RSTYPE_EXT_IRQ:
 135         {
 136                 struct acpi_resource_ext_irq *p = &resource->data.extended_irq;
 137                 if (!p || !p->number_of_interrupts) {
 138                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 139                                 "Blank EXT IRQ resource\n"));
 140                         return AE_OK;
 141                 }
 142                 for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
 143                         if (!p->interrupts[i]) {
 144                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i]));
 145                                 continue;
 146                         }
 147                         link->irq.possible[i] = p->interrupts[i];
 148                         link->irq.possible_count++;
 149                 }
 150                 link->irq.edge_level = p->edge_level;
 151                 link->irq.active_high_low = p->active_high_low;
 152                 link->irq.resource_type = ACPI_RSTYPE_EXT_IRQ;
 153                 break;
 154         }
 155         default:
 156                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 157                         "Resource is not an IRQ entry\n"));
 158                 return AE_OK;
 159         }
 160
 161         return AE_CTRL_TERMINATE;
 162 }
 163
 164
 165 static int
 166 acpi_pci_link_get_possible (
 167         struct acpi_pci_link    *link)
 168 {
 169         acpi_status             status;
 170
 171         ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
 172
 173         if (!link)
 174                 return_VALUE(-EINVAL);
 175
 176         status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
 177                         acpi_pci_link_check_possible, link);
 178         if (ACPI_FAILURE(status)) {
 179                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n"));
 180                 return_VALUE(-ENODEV);
 181         }
 182
 183         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 184                 "Found %d possible IRQs\n", link->irq.possible_count));
 185
 186         return_VALUE(0);
 187 }
 188
 189
 190 static acpi_status
 191 acpi_pci_link_check_current (
 192         struct acpi_resource    *resource,
 193         void                    *context)
 194 {
 195         int                     *irq = (int *) context;
 196
 197         ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
 198
 199         switch (resource->id) {
 200         case ACPI_RSTYPE_IRQ:
 201         {
 202                 struct acpi_resource_irq *p = &resource->data.irq;
 203                 if (!p || !p->number_of_interrupts) {
 204                         /*
 205                          * IRQ descriptors may have no IRQ# bits set,
 206                          * particularly those those w/ _STA disabled
 207                          */
 208                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 209                                 "Blank IRQ resource\n"));
 210                         return AE_OK;
 211                 }
 212                 *irq = p->interrupts[0];
 213                 break;
 214         }
 215         case ACPI_RSTYPE_EXT_IRQ:
 216         {
 217                 struct acpi_resource_ext_irq *p = &resource->data.extended_irq;
 218                 if (!p || !p->number_of_interrupts) {
 219                         /*
 220                          * extended IRQ descriptors must
 221                          * return at least 1 IRQ
 222                          */
 223                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 224                                 "Blank EXT IRQ resource\n"));
 225                         return AE_OK;
 226                 }
 227                 *irq = p->interrupts[0];
 228                 break;
 229         }
 230         default:
 231                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 232                         "Resource isn't an IRQ\n"));
 233                 return AE_OK;
 234         }
 235         return AE_CTRL_TERMINATE;
 236 }
 237
 238 /*
 239  * Run _CRS and set link->irq.active
 240  *
 241  * return value:
 242  * 0 - success
 243  * !0 - failure
 244  */
 245 static int
 246 acpi_pci_link_get_current (
 247         struct acpi_pci_link    *link)
 248 {
 249         int                     result = 0;
 250         acpi_status             status = AE_OK;
 251         int                     irq = 0;
 252
 253         ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
 254
 255         if (!link || !link->handle)
 256                 return_VALUE(-EINVAL);
 257
 258         link->irq.active = 0;
 259
 260         /* in practice, status disabled is meaningless, ignore it */
 261         if (acpi_strict) {
 262                 /* Query _STA, set link->device->status */
 263                 result = acpi_bus_get_status(link->device);
 264                 if (result) {
 265                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
 266                         goto end;
 267                 }
 268
 269                 if (!link->device->status.enabled) {
 270                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
 271                         return_VALUE(0);
 272                 }
 273         }
 274
 275         /*
 276          * Query and parse _CRS to get the current IRQ assignment.
 277          */
 278
 279         status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
 280                         acpi_pci_link_check_current, &irq);
 281         if (ACPI_FAILURE(status)) {
 282                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n"));
 283                 result = -ENODEV;
 284                 goto end;
 285         }
 286
 287         if (acpi_strict && !irq) {
 288                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n"));
 289                 result = -ENODEV;
 290         }
 291
 292         link->irq.active = irq;
 293
 294         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
 295
 296 end:
 297         return_VALUE(result);
 298 }
 299
 300 static int
 301 acpi_pci_link_set (
 302         struct acpi_pci_link    *link,
 303         int                     irq)
 304 {
 305         int                     result = 0;
 306         acpi_status             status = AE_OK;
 307         struct {
 308                 struct acpi_resource    res;
 309                 struct acpi_resource    end;
 310         }                       resource;
 311         struct acpi_buffer      buffer = {sizeof(resource)+1, &resource};
 312
 313         ACPI_FUNCTION_TRACE("acpi_pci_link_set");
 314
 315         if (!link || !irq)
 316                 return_VALUE(-EINVAL);
 317
 318         memset(&resource, 0, sizeof(resource));
 319
 320         switch(link->irq.resource_type) {
 321         case ACPI_RSTYPE_IRQ:
 322                 resource.res.id = ACPI_RSTYPE_IRQ;
 323                 resource.res.length = sizeof(struct acpi_resource);
 324                 resource.res.data.irq.edge_level = link->irq.edge_level;
 325                 resource.res.data.irq.active_high_low = link->irq.active_high_low;
 326                 if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
 327                         resource.res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
 328                 else
 329                         resource.res.data.irq.shared_exclusive = ACPI_SHARED;
 330                 resource.res.data.irq.number_of_interrupts = 1;
 331                 resource.res.data.irq.interrupts[0] = irq;
 332                 break;
 333
 334         case ACPI_RSTYPE_EXT_IRQ:
 335                 resource.res.id = ACPI_RSTYPE_EXT_IRQ;
 336                 resource.res.length = sizeof(struct acpi_resource);
 337                 resource.res.data.extended_irq.producer_consumer = ACPI_CONSUMER;
 338                 resource.res.data.extended_irq.edge_level = link->irq.edge_level;
 339                 resource.res.data.extended_irq.active_high_low = link->irq.active_high_low;
 340                 if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
 341                         resource.res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
 342                 else
 343                         resource.res.data.irq.shared_exclusive = ACPI_SHARED;
 344                 resource.res.data.extended_irq.number_of_interrupts = 1;
 345                 resource.res.data.extended_irq.interrupts[0] = irq;
 346                 /* ignore resource_source, it's optional */
 347                 break;
 348         default:
 349                 printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
 350                 return_VALUE(-EINVAL);
 351
 352         }
 353         resource.end.id = ACPI_RSTYPE_END_TAG;
 354
 355         /* Attempt to set the resource */
 356         status = acpi_set_current_resources(link->handle, &buffer);
 357
 358         /* check for total failure */
 359         if (ACPI_FAILURE(status)) {
 360                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
 361                 return_VALUE(-ENODEV);
 362         }
 363
 364         /* Query _STA, set device->status */
 365         result = acpi_bus_get_status(link->device);
 366         if (result) {
 367                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
 368                 return_VALUE(result);
 369         }
 370         if (!link->device->status.enabled) {
 371                 printk(KERN_WARNING PREFIX
 372                         "%s [%s] disabled and referenced, BIOS bug.\n",
 373                         acpi_device_name(link->device),
 374                         acpi_device_bid(link->device));
 375         }
 376
 377         /* Query _CRS, set link->irq.active */
 378         result = acpi_pci_link_get_current(link);
 379         if (result) {
 380                 return_VALUE(result);
 381         }
 382
 383         /*
 384          * Is current setting not what we set?
 385          * set link->irq.active
 386          */
 387         if (link->irq.active != irq) {
 388                 /*
 389                  * policy: when _CRS doesn't return what we just _SRS
 390                  * assume _SRS worked and override _CRS value.
 391                  */
 392                 printk(KERN_WARNING PREFIX
 393                         "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
 394                         acpi_device_name(link->device),
 395                         acpi_device_bid(link->device),
 396                         link->irq.active, irq);
 397                 link->irq.active = irq;
 398         }
 399
 400         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
 401
 402         return_VALUE(0);
 403 }
 404
 405
 406 /* --------------------------------------------------------------------------
 407                             PCI Link IRQ Management
 408    -------------------------------------------------------------------------- */
 409
 410 /*
 411  * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
 412  * Link Devices to move the PIRQs around to minimize sharing.
 413  *
 414  * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
 415  * that the BIOS has already set to active.  This is necessary because
 416  * ACPI has no automatic means of knowing what ISA IRQs are used.  Note that
 417  * if the BIOS doesn't set a Link Device active, ACPI needs to program it
 418  * even if acpi_irq_nobalance is set.
 419  *
 420  * A tables of penalties avoids directing PCI interrupts to well known
 421  * ISA IRQs. Boot params are available to over-ride the default table:
 422  *
 423  * List interrupts that are free for PCI use.
 424  * acpi_irq_pci=n[,m]
 425  *
 426  * List interrupts that should not be used for PCI:
 427  * acpi_irq_isa=n[,m]
 428  *
 429  * Note that PCI IRQ routers have a list of possible IRQs,
 430  * which may not include the IRQs this table says are available.
 431  *
 432  * Since this heuristic can't tell the difference between a link
 433  * that no device will attach to, vs. a link which may be shared
 434  * by multiple active devices -- it is not optimal.
 435  *
 436  * If interrupt performance is that important, get an IO-APIC system
 437  * with a pin dedicated to each device.  Or for that matter, an MSI
 438  * enabled system.
 439  */
 440
 441 #define ACPI_MAX_IRQS           256
 442 #define ACPI_MAX_ISA_IRQ        16
 443
 444 #define PIRQ_PENALTY_PCI_AVAILABLE      (0)
 445 #define PIRQ_PENALTY_PCI_POSSIBLE       (16*16)
 446 #define PIRQ_PENALTY_PCI_USING          (16*16*16)
 447 #define PIRQ_PENALTY_ISA_TYPICAL        (16*16*16*16)
 448 #define PIRQ_PENALTY_ISA_USED           (16*16*16*16*16)
 449 #define PIRQ_PENALTY_ISA_ALWAYS         (16*16*16*16*16*16)
 450
 451 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
 452         PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ0 timer */
 453         PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ1 keyboard */
 454         PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ2 cascade */
 455         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ3 serial */
 456         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ4 serial */
 457         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ5 sometimes SoundBlaster */
 458         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ6 */
 459         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ7 parallel, spurious */
 460         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ8 rtc, sometimes */
 461         PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ9  PCI, often acpi */
 462         PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ10 PCI */
 463         PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ11 PCI */
 464         PIRQ_PENALTY_ISA_USED,  /* IRQ12 mouse */
 465         PIRQ_PENALTY_ISA_USED,  /* IRQ13 fpe, sometimes */
 466         PIRQ_PENALTY_ISA_USED,  /* IRQ14 ide0 */
 467         PIRQ_PENALTY_ISA_USED,  /* IRQ15 ide1 */
 468                         /* >IRQ15 */
 469 };
 470
 471 int __init
 472 acpi_irq_penalty_init(void)
 473 {
 474         struct list_head        *node = NULL;
 475         struct acpi_pci_link    *link = NULL;
 476         int                     i = 0;
 477
 478         ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
 479
 480         /*
 481          * Update penalties to facilitate IRQ balancing.
 482          */
 483         list_for_each(node, &acpi_link.entries) {
 484
 485                 link = list_entry(node, struct acpi_pci_link, node);
 486                 if (!link) {
 487                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 488                         continue;
 489                 }
 490
 491                 /*
 492                  * reflect the possible and active irqs in the penalty table --
 493                  * useful for breaking ties.
 494                  */
 495                 if (link->irq.possible_count) {
 496                         int penalty = PIRQ_PENALTY_PCI_POSSIBLE / link->irq.possible_count;
 497
 498                         for (i = 0; i < link->irq.possible_count; i++) {
 499                                 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
 500                                         acpi_irq_penalty[link->irq.possible[i]] += penalty;
 501                         }
 502
 503                 } else if (link->irq.active) {
 504                         acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_POSSIBLE;
 505                 }
 506         }
 507         /* Add a penalty for the SCI */
 508         acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
 509
 510         return_VALUE(0);
 511 }
 512
 513 static int acpi_irq_balance;    /* 0: static, 1: balance */
 514
 515 static int acpi_pci_link_allocate(struct acpi_pci_link* link) {
 516         int irq;
 517         int i;
 518
 519         ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
 520
 521         if (link->irq.initialized)
 522                 return_VALUE(0);
 523
 524         /*
 525          * search for active IRQ in list of possible IRQs.
 526          */
 527         for (i = 0; i < link->irq.possible_count; ++i) {
 528                 if (link->irq.active == link->irq.possible[i])
 529                         break;
 530         }
 531         /*
 532          * forget active IRQ that is not in possible list
 533          */
 534         if (i == link->irq.possible_count) {
 535                 if (acpi_strict)
 536                         printk(KERN_WARNING PREFIX "_CRS %d not found"
 537                                 " in _PRS\n", link->irq.active);
 538                 link->irq.active = 0;
 539         }
 540
 541         /*
 542          * if active found, use it; else pick entry from end of possible list.
 543          */
 544         if (link->irq.active) {
 545                 irq = link->irq.active;
 546         } else {
 547                 irq = link->irq.possible[link->irq.possible_count - 1];
 548         }
 549
 550         if (acpi_irq_balance || !link->irq.active) {
 551                 /*
 552                  * Select the best IRQ.  This is done in reverse to promote
 553                  * the use of IRQs 9, 10, 11, and >15.
 554                  */
 555                 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
 556                         if (acpi_irq_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]])
 557                                 irq = link->irq.possible[i];
 558                 }
 559         }
 560
 561         /* Attempt to enable the link device at this IRQ. */
 562         if (acpi_pci_link_set(link, irq)) {
 563                 printk(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
 564                                 "Try pci=noacpi or acpi=off\n",
 565                         acpi_device_name(link->device),
 566                         acpi_device_bid(link->device));
 567                 return_VALUE(-ENODEV);
 568         } else {
 569                 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
 570                 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
 571                         acpi_device_name(link->device),
 572                         acpi_device_bid(link->device), link->irq.active);
 573         }
 574
 575         link->irq.initialized = 1;
 576
 577         return_VALUE(0);
 578 }
 579
 580
 581 int
 582 acpi_pci_link_get_irq (
 583         acpi_handle             handle,
 584         int                     index,
 585         int*                    edge_level,
 586         int*                    active_high_low)
 587 {
 588         int                     result = 0;
 589         struct acpi_device      *device = NULL;
 590         struct acpi_pci_link    *link = NULL;
 591
 592         ACPI_FUNCTION_TRACE("acpi_pci_link_get_irq");
 593
 594         result = acpi_bus_get_device(handle, &device);
 595         if (result) {
 596                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
 597                 return_VALUE(0);
 598         }
 599
 600         link = (struct acpi_pci_link *) acpi_driver_data(device);
 601         if (!link) {
 602                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 603                 return_VALUE(0);
 604         }
 605
 606         /* TBD: Support multiple index (IRQ) entries per Link Device */
 607         if (index) {
 608                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
 609                 return_VALUE(0);
 610         }
 611
 612         if (acpi_pci_link_allocate(link))
 613                 return_VALUE(0);
 614
 615         if (!link->irq.active) {
 616                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
 617                 return_VALUE(0);
 618         }
 619
 620         if (edge_level) *edge_level = link->irq.edge_level;
 621         if (active_high_low) *active_high_low = link->irq.active_high_low;
 622         return_VALUE(link->irq.active);
 623 }
 624
 625
 626 /* --------------------------------------------------------------------------
 627                                  Driver Interface
 628    -------------------------------------------------------------------------- */
 629
 630 static int
 631 acpi_pci_link_add (
 632         struct acpi_device *device)
 633 {
 634         int                     result = 0;
 635         struct acpi_pci_link    *link = NULL;
 636         int                     i = 0;
 637         int                     found = 0;
 638
 639         ACPI_FUNCTION_TRACE("acpi_pci_link_add");
 640
 641         if (!device)
 642                 return_VALUE(-EINVAL);
 643
 644         link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
 645         if (!link)
 646                 return_VALUE(-ENOMEM);
 647         memset(link, 0, sizeof(struct acpi_pci_link));
 648
 649         link->device = device;
 650         link->handle = device->handle;
 651         strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
 652         strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
 653         acpi_driver_data(device) = link;
 654
 655         result = acpi_pci_link_get_possible(link);
 656         if (result)
 657                 goto end;
 658
 659         /* query and set link->irq.active */
 660         acpi_pci_link_get_current(link);
 661
 662         printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
 663                 acpi_device_bid(device));
 664         for (i = 0; i < link->irq.possible_count; i++) {
 665                 if (link->irq.active == link->irq.possible[i]) {
 666                         printk(" *%d", link->irq.possible[i]);
 667                         found = 1;
 668                 }
 669                 else
 670                         printk(" %d", link->irq.possible[i]);
 671         }
 672
 673         printk(")");
 674
 675         if (!found)
 676                 printk(" *%d", link->irq.active);
 677
 678         if(!link->device->status.enabled)
 679                 printk(", disabled.");
 680
 681         printk("\n");
 682
 683         /* TBD: Acquire/release lock */
 684         list_add_tail(&link->node, &acpi_link.entries);
 685         acpi_link.count++;
 686
 687 end:
 688         /* disable all links -- to be activated on use */
 689         acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
 690
 691         if (result)
 692                 kfree(link);
 693
 694         return_VALUE(result);
 695 }
 696
 697
 698 static int
 699 acpi_pci_link_resume (
 700         struct acpi_pci_link    *link)
 701 {
 702         ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
 703
 704         if (link->irq.active && link->irq.initialized)
 705                 return_VALUE(acpi_pci_link_set(link, link->irq.active));
 706         else
 707                 return_VALUE(0);
 708 }
 709
 710
 711 static int
 712 irqrouter_resume(
 713         struct sys_device *dev)
 714 {
 715         struct list_head        *node = NULL;
 716         struct acpi_pci_link    *link = NULL;
 717
 718         ACPI_FUNCTION_TRACE("irqrouter_resume");
 719
 720         list_for_each(node, &acpi_link.entries) {
 721
 722                 link = list_entry(node, struct acpi_pci_link, node);
 723                 if (!link) {
 724                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 725                         continue;
 726                 }
 727
 728                 acpi_pci_link_resume(link);
 729         }
 730         return_VALUE(0);
 731 }
 732
 733
 734 static int
 735 acpi_pci_link_remove (
 736         struct acpi_device      *device,
 737         int                     type)
 738 {
 739         struct acpi_pci_link *link = NULL;
 740
 741         ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
 742
 743         if (!device || !acpi_driver_data(device))
 744                 return_VALUE(-EINVAL);
 745
 746         link = (struct acpi_pci_link *) acpi_driver_data(device);
 747
 748         /* TBD: Acquire/release lock */
 749         list_del(&link->node);
 750
 751         kfree(link);
 752
 753         return_VALUE(0);
 754 }
 755
 756 /*
 757  * modify acpi_irq_penalty[] from cmdline
 758  */
 759 static int __init acpi_irq_penalty_update(char *str, int used)
 760 {
 761         int i;
 762
 763         for (i = 0; i < 16; i++) {
 764                 int retval;
 765                 int irq;
 766
 767                 retval = get_option(&str,&irq);
 768
 769                 if (!retval)
 770                         break;  /* no number found */
 771
 772                 if (irq < 0)
 773                         continue;
 774
 775                 if (irq >= ACPI_MAX_IRQS)
 776                         continue;
 777
 778                 if (used)
 779                         acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
 780                 else
 781                         acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
 782
 783                 if (retval != 2)        /* no next number */
 784                         break;
 785         }
 786         return 1;
 787 }
 788
 789 /*
 790  * Over-ride default table to reserve additional IRQs for use by ISA
 791  * e.g. acpi_irq_isa=5
 792  * Useful for telling ACPI how not to interfere with your ISA sound card.
 793  */
 794 static int __init acpi_irq_isa(char *str)
 795 {
 796         return(acpi_irq_penalty_update(str, 1));
 797 }
 798 __setup("acpi_irq_isa=", acpi_irq_isa);
 799
 800 /*
 801  * Over-ride default table to free additional IRQs for use by PCI
 802  * e.g. acpi_irq_pci=7,15
 803  * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
 804  */
 805 static int __init acpi_irq_pci(char *str)
 806 {
 807         return(acpi_irq_penalty_update(str, 0));
 808 }
 809 __setup("acpi_irq_pci=", acpi_irq_pci);
 810
 811 static int __init acpi_irq_nobalance_set(char *str)
 812 {
 813         acpi_irq_balance = 0;
 814         return(1);
 815 }
 816 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
 817
 818 int __init acpi_irq_balance_set(char *str)
 819 {
 820         acpi_irq_balance = 1;
 821         return(1);
 822 }
 823 __setup("acpi_irq_balance", acpi_irq_balance_set);
 824
 825
 826 static struct sysdev_class irqrouter_sysdev_class = {
 827         set_kset_name("irqrouter"),
 828         .resume = irqrouter_resume,
 829 };
 830
 831
 832 static struct sys_device device_irqrouter = {
 833         .id     = 0,
 834         .cls    = &irqrouter_sysdev_class,
 835 };
 836
 837
 838 static int __init irqrouter_init_sysfs(void)
 839 {
 840         int error;
 841
 842         ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
 843
 844         if (acpi_disabled || acpi_noirq)
 845                 return_VALUE(0);
 846
 847         error = sysdev_class_register(&irqrouter_sysdev_class);
 848         if (!error)
 849                 error = sysdev_register(&device_irqrouter);
 850
 851         return_VALUE(error);
 852 }
 853
 854 device_initcall(irqrouter_init_sysfs);
 855
 856
 857 static int __init acpi_pci_link_init (void)
 858 {
 859         ACPI_FUNCTION_TRACE("acpi_pci_link_init");
 860
 861         if (acpi_noirq)
 862                 return_VALUE(0);
 863
 864         acpi_link.count = 0;
 865         INIT_LIST_HEAD(&acpi_link.entries);
 866
 867         if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
 868                 return_VALUE(-ENODEV);
 869
 870         return_VALUE(0);
 871 }
 872
 873 subsys_initcall(acpi_pci_link_init);