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   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_ACPI_STATUS(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_ACPI_STATUS(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_ACPI_STATUS(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_ACPI_STATUS(AE_OK);
 159         }
 160
 161         return_ACPI_STATUS(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_ACPI_STATUS(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_ACPI_STATUS(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_ACPI_STATUS(AE_OK);
 234         }
 235         return_ACPI_STATUS(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 = {0, NULL};
 312
 313         ACPI_FUNCTION_TRACE("acpi_pci_link_set");
 314
 315         if (!link || !irq)
 316                 return_VALUE(-EINVAL);
 317
 318         resource = kmalloc( sizeof(*resource)+1, GFP_KERNEL);
 319         if(!resource)
 320                 return_VALUE(-ENOMEM);
 321
 322         memset(resource, 0, sizeof(*resource)+1);
 323         buffer.length = sizeof(*resource) +1;
 324         buffer.pointer = resource;
 325
 326         switch(link->irq.resource_type) {
 327         case ACPI_RSTYPE_IRQ:
 328                 resource->res.id = ACPI_RSTYPE_IRQ;
 329                 resource->res.length = sizeof(struct acpi_resource);
 330                 resource->res.data.irq.edge_level = link->irq.edge_level;
 331                 resource->res.data.irq.active_high_low = link->irq.active_high_low;
 332                 if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
 333                         resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
 334                 else
 335                         resource->res.data.irq.shared_exclusive = ACPI_SHARED;
 336                 resource->res.data.irq.number_of_interrupts = 1;
 337                 resource->res.data.irq.interrupts[0] = irq;
 338                 break;
 339
 340         case ACPI_RSTYPE_EXT_IRQ:
 341                 resource->res.id = ACPI_RSTYPE_EXT_IRQ;
 342                 resource->res.length = sizeof(struct acpi_resource);
 343                 resource->res.data.extended_irq.producer_consumer = ACPI_CONSUMER;
 344                 resource->res.data.extended_irq.edge_level = link->irq.edge_level;
 345                 resource->res.data.extended_irq.active_high_low = link->irq.active_high_low;
 346                 if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
 347                         resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
 348                 else
 349                         resource->res.data.irq.shared_exclusive = ACPI_SHARED;
 350                 resource->res.data.extended_irq.number_of_interrupts = 1;
 351                 resource->res.data.extended_irq.interrupts[0] = irq;
 352                 /* ignore resource_source, it's optional */
 353                 break;
 354         default:
 355                 printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
 356                 result = -EINVAL;
 357                 goto end;
 358
 359         }
 360         resource->end.id = ACPI_RSTYPE_END_TAG;
 361
 362         /* Attempt to set the resource */
 363         status = acpi_set_current_resources(link->handle, &buffer);
 364
 365         /* check for total failure */
 366         if (ACPI_FAILURE(status)) {
 367                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
 368                 result = -ENODEV;
 369                 goto end;
 370         }
 371
 372         /* Query _STA, set device->status */
 373         result = acpi_bus_get_status(link->device);
 374         if (result) {
 375                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
 376                 goto end;
 377         }
 378         if (!link->device->status.enabled) {
 379                 printk(KERN_WARNING PREFIX
 380                         "%s [%s] disabled and referenced, BIOS bug.\n",
 381                         acpi_device_name(link->device),
 382                         acpi_device_bid(link->device));
 383         }
 384
 385         /* Query _CRS, set link->irq.active */
 386         result = acpi_pci_link_get_current(link);
 387         if (result) {
 388                 goto end;
 389         }
 390
 391         /*
 392          * Is current setting not what we set?
 393          * set link->irq.active
 394          */
 395         if (link->irq.active != irq) {
 396                 /*
 397                  * policy: when _CRS doesn't return what we just _SRS
 398                  * assume _SRS worked and override _CRS value.
 399                  */
 400                 printk(KERN_WARNING PREFIX
 401                         "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
 402                         acpi_device_name(link->device),
 403                         acpi_device_bid(link->device),
 404                         link->irq.active, irq);
 405                 link->irq.active = irq;
 406         }
 407
 408         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
 409
 410 end:
 411         kfree(resource);
 412         return_VALUE(result);
 413 }
 414
 415
 416 /* --------------------------------------------------------------------------
 417                             PCI Link IRQ Management
 418    -------------------------------------------------------------------------- */
 419
 420 /*
 421  * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
 422  * Link Devices to move the PIRQs around to minimize sharing.
 423  *
 424  * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
 425  * that the BIOS has already set to active.  This is necessary because
 426  * ACPI has no automatic means of knowing what ISA IRQs are used.  Note that
 427  * if the BIOS doesn't set a Link Device active, ACPI needs to program it
 428  * even if acpi_irq_nobalance is set.
 429  *
 430  * A tables of penalties avoids directing PCI interrupts to well known
 431  * ISA IRQs. Boot params are available to over-ride the default table:
 432  *
 433  * List interrupts that are free for PCI use.
 434  * acpi_irq_pci=n[,m]
 435  *
 436  * List interrupts that should not be used for PCI:
 437  * acpi_irq_isa=n[,m]
 438  *
 439  * Note that PCI IRQ routers have a list of possible IRQs,
 440  * which may not include the IRQs this table says are available.
 441  *
 442  * Since this heuristic can't tell the difference between a link
 443  * that no device will attach to, vs. a link which may be shared
 444  * by multiple active devices -- it is not optimal.
 445  *
 446  * If interrupt performance is that important, get an IO-APIC system
 447  * with a pin dedicated to each device.  Or for that matter, an MSI
 448  * enabled system.
 449  */
 450
 451 #define ACPI_MAX_IRQS           256
 452 #define ACPI_MAX_ISA_IRQ        16
 453
 454 #define PIRQ_PENALTY_PCI_AVAILABLE      (0)
 455 #define PIRQ_PENALTY_PCI_POSSIBLE       (16*16)
 456 #define PIRQ_PENALTY_PCI_USING          (16*16*16)
 457 #define PIRQ_PENALTY_ISA_TYPICAL        (16*16*16*16)
 458 #define PIRQ_PENALTY_ISA_USED           (16*16*16*16*16)
 459 #define PIRQ_PENALTY_ISA_ALWAYS         (16*16*16*16*16*16)
 460
 461 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
 462         PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ0 timer */
 463         PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ1 keyboard */
 464         PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ2 cascade */
 465         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ3 serial */
 466         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ4 serial */
 467         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ5 sometimes SoundBlaster */
 468         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ6 */
 469         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ7 parallel, spurious */
 470         PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ8 rtc, sometimes */
 471         PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ9  PCI, often acpi */
 472         PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ10 PCI */
 473         PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ11 PCI */
 474         PIRQ_PENALTY_ISA_USED,  /* IRQ12 mouse */
 475         PIRQ_PENALTY_ISA_USED,  /* IRQ13 fpe, sometimes */
 476         PIRQ_PENALTY_ISA_USED,  /* IRQ14 ide0 */
 477         PIRQ_PENALTY_ISA_USED,  /* IRQ15 ide1 */
 478                         /* >IRQ15 */
 479 };
 480
 481 int __init
 482 acpi_irq_penalty_init(void)
 483 {
 484         struct list_head        *node = NULL;
 485         struct acpi_pci_link    *link = NULL;
 486         int                     i = 0;
 487
 488         ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
 489
 490         /*
 491          * Update penalties to facilitate IRQ balancing.
 492          */
 493         list_for_each(node, &acpi_link.entries) {
 494
 495                 link = list_entry(node, struct acpi_pci_link, node);
 496                 if (!link) {
 497                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 498                         continue;
 499                 }
 500
 501                 /*
 502                  * reflect the possible and active irqs in the penalty table --
 503                  * useful for breaking ties.
 504                  */
 505                 if (link->irq.possible_count) {
 506                         int penalty = PIRQ_PENALTY_PCI_POSSIBLE / link->irq.possible_count;
 507
 508                         for (i = 0; i < link->irq.possible_count; i++) {
 509                                 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
 510                                         acpi_irq_penalty[link->irq.possible[i]] += penalty;
 511                         }
 512
 513                 } else if (link->irq.active) {
 514                         acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_POSSIBLE;
 515                 }
 516         }
 517         /* Add a penalty for the SCI */
 518         acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
 519
 520         return_VALUE(0);
 521 }
 522
 523 static int acpi_irq_balance;    /* 0: static, 1: balance */
 524
 525 static int acpi_pci_link_allocate(
 526         struct acpi_pci_link    *link)
 527 {
 528         int                     irq;
 529         int                     i;
 530
 531         ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
 532
 533         if (link->irq.initialized)
 534                 return_VALUE(0);
 535
 536         /*
 537          * search for active IRQ in list of possible IRQs.
 538          */
 539         for (i = 0; i < link->irq.possible_count; ++i) {
 540                 if (link->irq.active == link->irq.possible[i])
 541                         break;
 542         }
 543         /*
 544          * forget active IRQ that is not in possible list
 545          */
 546         if (i == link->irq.possible_count) {
 547                 if (acpi_strict)
 548                         printk(KERN_WARNING PREFIX "_CRS %d not found"
 549                                 " in _PRS\n", link->irq.active);
 550                 link->irq.active = 0;
 551         }
 552
 553         /*
 554          * if active found, use it; else pick entry from end of possible list.
 555          */
 556         if (link->irq.active) {
 557                 irq = link->irq.active;
 558         } else {
 559                 irq = link->irq.possible[link->irq.possible_count - 1];
 560         }
 561
 562         if (acpi_irq_balance || !link->irq.active) {
 563                 /*
 564                  * Select the best IRQ.  This is done in reverse to promote
 565                  * the use of IRQs 9, 10, 11, and >15.
 566                  */
 567                 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
 568                         if (acpi_irq_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]])
 569                                 irq = link->irq.possible[i];
 570                 }
 571         }
 572
 573         /* Attempt to enable the link device at this IRQ. */
 574         if (acpi_pci_link_set(link, irq)) {
 575                 printk(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
 576                                 "Try pci=noacpi or acpi=off\n",
 577                         acpi_device_name(link->device),
 578                         acpi_device_bid(link->device));
 579                 return_VALUE(-ENODEV);
 580         } else {
 581                 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
 582                 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
 583                         acpi_device_name(link->device),
 584                         acpi_device_bid(link->device), link->irq.active);
 585         }
 586
 587         link->irq.initialized = 1;
 588
 589         return_VALUE(0);
 590 }
 591
 592 /*
 593  * acpi_pci_link_get_irq
 594  * success: return IRQ >= 0
 595  * failure: return -1
 596  */
 597
 598 int
 599 acpi_pci_link_get_irq (
 600         acpi_handle             handle,
 601         int                     index,
 602         int                     *edge_level,
 603         int                     *active_high_low,
 604         char                    **name)
 605 {
 606         int                     result = 0;
 607         struct acpi_device      *device = NULL;
 608         struct acpi_pci_link    *link = NULL;
 609
 610         ACPI_FUNCTION_TRACE("acpi_pci_link_get_irq");
 611
 612         result = acpi_bus_get_device(handle, &device);
 613         if (result) {
 614                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
 615                 return_VALUE(-1);
 616         }
 617
 618         link = (struct acpi_pci_link *) acpi_driver_data(device);
 619         if (!link) {
 620                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 621                 return_VALUE(-1);
 622         }
 623
 624         /* TBD: Support multiple index (IRQ) entries per Link Device */
 625         if (index) {
 626                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
 627                 return_VALUE(-1);
 628         }
 629
 630         if (acpi_pci_link_allocate(link))
 631                 return_VALUE(-1);
 632
 633         if (!link->irq.active) {
 634                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
 635                 return_VALUE(-1);
 636         }
 637
 638         if (edge_level) *edge_level = link->irq.edge_level;
 639         if (active_high_low) *active_high_low = link->irq.active_high_low;
 640         if (name) *name = acpi_device_bid(link->device);
 641         return_VALUE(link->irq.active);
 642 }
 643
 644
 645 /* --------------------------------------------------------------------------
 646                                  Driver Interface
 647    -------------------------------------------------------------------------- */
 648
 649 static int
 650 acpi_pci_link_add (
 651         struct acpi_device *device)
 652 {
 653         int                     result = 0;
 654         struct acpi_pci_link    *link = NULL;
 655         int                     i = 0;
 656         int                     found = 0;
 657
 658         ACPI_FUNCTION_TRACE("acpi_pci_link_add");
 659
 660         if (!device)
 661                 return_VALUE(-EINVAL);
 662
 663         link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
 664         if (!link)
 665                 return_VALUE(-ENOMEM);
 666         memset(link, 0, sizeof(struct acpi_pci_link));
 667
 668         link->device = device;
 669         link->handle = device->handle;
 670         strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
 671         strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
 672         acpi_driver_data(device) = link;
 673
 674         result = acpi_pci_link_get_possible(link);
 675         if (result)
 676                 goto end;
 677
 678         /* query and set link->irq.active */
 679         acpi_pci_link_get_current(link);
 680
 681         printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
 682                 acpi_device_bid(device));
 683         for (i = 0; i < link->irq.possible_count; i++) {
 684                 if (link->irq.active == link->irq.possible[i]) {
 685                         printk(" *%d", link->irq.possible[i]);
 686                         found = 1;
 687                 }
 688                 else
 689                         printk(" %d", link->irq.possible[i]);
 690         }
 691
 692         printk(")");
 693
 694         if (!found)
 695                 printk(" *%d", link->irq.active);
 696
 697         if(!link->device->status.enabled)
 698                 printk(", disabled.");
 699
 700         printk("\n");
 701
 702         /* TBD: Acquire/release lock */
 703         list_add_tail(&link->node, &acpi_link.entries);
 704         acpi_link.count++;
 705
 706 end:
 707         /* disable all links -- to be activated on use */
 708         acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
 709
 710         if (result)
 711                 kfree(link);
 712
 713         return_VALUE(result);
 714 }
 715
 716
 717 static int
 718 acpi_pci_link_resume (
 719         struct acpi_pci_link    *link)
 720 {
 721         ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
 722
 723         if (link->irq.active && link->irq.initialized)
 724                 return_VALUE(acpi_pci_link_set(link, link->irq.active));
 725         else
 726                 return_VALUE(0);
 727 }
 728
 729
 730 static int
 731 irqrouter_resume(
 732         struct sys_device *dev)
 733 {
 734         struct list_head        *node = NULL;
 735         struct acpi_pci_link    *link = NULL;
 736
 737         ACPI_FUNCTION_TRACE("irqrouter_resume");
 738
 739         list_for_each(node, &acpi_link.entries) {
 740
 741                 link = list_entry(node, struct acpi_pci_link, node);
 742                 if (!link) {
 743                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 744                         continue;
 745                 }
 746
 747                 acpi_pci_link_resume(link);
 748         }
 749         return_VALUE(0);
 750 }
 751
 752
 753 static int
 754 acpi_pci_link_remove (
 755         struct acpi_device      *device,
 756         int                     type)
 757 {
 758         struct acpi_pci_link *link = NULL;
 759
 760         ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
 761
 762         if (!device || !acpi_driver_data(device))
 763                 return_VALUE(-EINVAL);
 764
 765         link = (struct acpi_pci_link *) acpi_driver_data(device);
 766
 767         /* TBD: Acquire/release lock */
 768         list_del(&link->node);
 769
 770         kfree(link);
 771
 772         return_VALUE(0);
 773 }
 774
 775 /*
 776  * modify acpi_irq_penalty[] from cmdline
 777  */
 778 static int __init acpi_irq_penalty_update(char *str, int used)
 779 {
 780         int i;
 781
 782         for (i = 0; i < 16; i++) {
 783                 int retval;
 784                 int irq;
 785
 786                 retval = get_option(&str,&irq);
 787
 788                 if (!retval)
 789                         break;  /* no number found */
 790
 791                 if (irq < 0)
 792                         continue;
 793
 794                 if (irq >= ACPI_MAX_IRQS)
 795                         continue;
 796
 797                 if (used)
 798                         acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
 799                 else
 800                         acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
 801
 802                 if (retval != 2)        /* no next number */
 803                         break;
 804         }
 805         return 1;
 806 }
 807
 808 /*
 809  * We'd like PNP to call this routine for the
 810  * single ISA_USED value for each legacy device.
 811  * But instead it calls us with each POSSIBLE setting.
 812  * There is no ISA_POSSIBLE weight, so we simply use
 813  * the (small) PCI_USING penalty.
 814  */
 815 void acpi_penalize_isa_irq(int irq)
 816 {
 817         acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
 818 }
 819
 820 /*
 821  * Over-ride default table to reserve additional IRQs for use by ISA
 822  * e.g. acpi_irq_isa=5
 823  * Useful for telling ACPI how not to interfere with your ISA sound card.
 824  */
 825 static int __init acpi_irq_isa(char *str)
 826 {
 827         return acpi_irq_penalty_update(str, 1);
 828 }
 829 __setup("acpi_irq_isa=", acpi_irq_isa);
 830
 831 /*
 832  * Over-ride default table to free additional IRQs for use by PCI
 833  * e.g. acpi_irq_pci=7,15
 834  * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
 835  */
 836 static int __init acpi_irq_pci(char *str)
 837 {
 838         return acpi_irq_penalty_update(str, 0);
 839 }
 840 __setup("acpi_irq_pci=", acpi_irq_pci);
 841
 842 static int __init acpi_irq_nobalance_set(char *str)
 843 {
 844         acpi_irq_balance = 0;
 845         return 1;
 846 }
 847 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
 848
 849 int __init acpi_irq_balance_set(char *str)
 850 {
 851         acpi_irq_balance = 1;
 852         return 1;
 853 }
 854 __setup("acpi_irq_balance", acpi_irq_balance_set);
 855
 856
 857 static struct sysdev_class irqrouter_sysdev_class = {
 858         set_kset_name("irqrouter"),
 859         .resume = irqrouter_resume,
 860 };
 861
 862
 863 static struct sys_device device_irqrouter = {
 864         .id     = 0,
 865         .cls    = &irqrouter_sysdev_class,
 866 };
 867
 868
 869 static int __init irqrouter_init_sysfs(void)
 870 {
 871         int error;
 872
 873         ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
 874
 875         if (acpi_disabled || acpi_noirq)
 876                 return_VALUE(0);
 877
 878         error = sysdev_class_register(&irqrouter_sysdev_class);
 879         if (!error)
 880                 error = sysdev_register(&device_irqrouter);
 881
 882         return_VALUE(error);
 883 }
 884
 885 device_initcall(irqrouter_init_sysfs);
 886
 887
 888 static int __init acpi_pci_link_init (void)
 889 {
 890         ACPI_FUNCTION_TRACE("acpi_pci_link_init");
 891
 892         if (acpi_noirq)
 893                 return_VALUE(0);
 894
 895         acpi_link.count = 0;
 896         INIT_LIST_HEAD(&acpi_link.entries);
 897
 898         if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
 899                 return_VALUE(-ENODEV);
 900
 901         return_VALUE(0);
 902 }
 903
 904 subsys_initcall(acpi_pci_link_init);