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_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(struct acpi_pci_link* link) {
 526         int irq;
 527         int i;
 528
 529         ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
 530
 531         if (link->irq.initialized)
 532                 return_VALUE(0);
 533
 534         /*
 535          * search for active IRQ in list of possible IRQs.
 536          */
 537         for (i = 0; i < link->irq.possible_count; ++i) {
 538                 if (link->irq.active == link->irq.possible[i])
 539                         break;
 540         }
 541         /*
 542          * forget active IRQ that is not in possible list
 543          */
 544         if (i == link->irq.possible_count) {
 545                 if (acpi_strict)
 546                         printk(KERN_WARNING PREFIX "_CRS %d not found"
 547                                 " in _PRS\n", link->irq.active);
 548                 link->irq.active = 0;
 549         }
 550
 551         /*
 552          * if active found, use it; else pick entry from end of possible list.
 553          */
 554         if (link->irq.active) {
 555                 irq = link->irq.active;
 556         } else {
 557                 irq = link->irq.possible[link->irq.possible_count - 1];
 558         }
 559
 560         if (acpi_irq_balance || !link->irq.active) {
 561                 /*
 562                  * Select the best IRQ.  This is done in reverse to promote
 563                  * the use of IRQs 9, 10, 11, and >15.
 564                  */
 565                 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
 566                         if (acpi_irq_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]])
 567                                 irq = link->irq.possible[i];
 568                 }
 569         }
 570
 571         /* Attempt to enable the link device at this IRQ. */
 572         if (acpi_pci_link_set(link, irq)) {
 573                 printk(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
 574                                 "Try pci=noacpi or acpi=off\n",
 575                         acpi_device_name(link->device),
 576                         acpi_device_bid(link->device));
 577                 return_VALUE(-ENODEV);
 578         } else {
 579                 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
 580                 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
 581                         acpi_device_name(link->device),
 582                         acpi_device_bid(link->device), link->irq.active);
 583         }
 584
 585         link->irq.initialized = 1;
 586
 587         return_VALUE(0);
 588 }
 589
 590 /*
 591  * acpi_pci_link_get_irq
 592  * success: return IRQ >= 0
 593  * failure: return -1
 594  */
 595
 596 int
 597 acpi_pci_link_get_irq (
 598         acpi_handle             handle,
 599         int                     index,
 600         int*                    edge_level,
 601         int*                    active_high_low)
 602 {
 603         int                     result = 0;
 604         struct acpi_device      *device = NULL;
 605         struct acpi_pci_link    *link = NULL;
 606
 607         ACPI_FUNCTION_TRACE("acpi_pci_link_get_irq");
 608
 609         result = acpi_bus_get_device(handle, &device);
 610         if (result) {
 611                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
 612                 return_VALUE(-1);
 613         }
 614
 615         link = (struct acpi_pci_link *) acpi_driver_data(device);
 616         if (!link) {
 617                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 618                 return_VALUE(-1);
 619         }
 620
 621         /* TBD: Support multiple index (IRQ) entries per Link Device */
 622         if (index) {
 623                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
 624                 return_VALUE(-1);
 625         }
 626
 627         if (acpi_pci_link_allocate(link))
 628                 return_VALUE(-1);
 629
 630         if (!link->irq.active) {
 631                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
 632                 return_VALUE(-1);
 633         }
 634
 635         if (edge_level) *edge_level = link->irq.edge_level;
 636         if (active_high_low) *active_high_low = link->irq.active_high_low;
 637         return_VALUE(link->irq.active);
 638 }
 639
 640
 641 /* --------------------------------------------------------------------------
 642                                  Driver Interface
 643    -------------------------------------------------------------------------- */
 644
 645 static int
 646 acpi_pci_link_add (
 647         struct acpi_device *device)
 648 {
 649         int                     result = 0;
 650         struct acpi_pci_link    *link = NULL;
 651         int                     i = 0;
 652         int                     found = 0;
 653
 654         ACPI_FUNCTION_TRACE("acpi_pci_link_add");
 655
 656         if (!device)
 657                 return_VALUE(-EINVAL);
 658
 659         link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
 660         if (!link)
 661                 return_VALUE(-ENOMEM);
 662         memset(link, 0, sizeof(struct acpi_pci_link));
 663
 664         link->device = device;
 665         link->handle = device->handle;
 666         strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
 667         strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
 668         acpi_driver_data(device) = link;
 669
 670         result = acpi_pci_link_get_possible(link);
 671         if (result)
 672                 goto end;
 673
 674         /* query and set link->irq.active */
 675         acpi_pci_link_get_current(link);
 676
 677         printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
 678                 acpi_device_bid(device));
 679         for (i = 0; i < link->irq.possible_count; i++) {
 680                 if (link->irq.active == link->irq.possible[i]) {
 681                         printk(" *%d", link->irq.possible[i]);
 682                         found = 1;
 683                 }
 684                 else
 685                         printk(" %d", link->irq.possible[i]);
 686         }
 687
 688         printk(")");
 689
 690         if (!found)
 691                 printk(" *%d", link->irq.active);
 692
 693         if(!link->device->status.enabled)
 694                 printk(", disabled.");
 695
 696         printk("\n");
 697
 698         /* TBD: Acquire/release lock */
 699         list_add_tail(&link->node, &acpi_link.entries);
 700         acpi_link.count++;
 701
 702 end:
 703         /* disable all links -- to be activated on use */
 704         acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
 705
 706         if (result)
 707                 kfree(link);
 708
 709         return_VALUE(result);
 710 }
 711
 712
 713 static int
 714 acpi_pci_link_resume (
 715         struct acpi_pci_link    *link)
 716 {
 717         ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
 718
 719         if (link->irq.active && link->irq.initialized)
 720                 return_VALUE(acpi_pci_link_set(link, link->irq.active));
 721         else
 722                 return_VALUE(0);
 723 }
 724
 725
 726 static int
 727 irqrouter_resume(
 728         struct sys_device *dev)
 729 {
 730         struct list_head        *node = NULL;
 731         struct acpi_pci_link    *link = NULL;
 732
 733         ACPI_FUNCTION_TRACE("irqrouter_resume");
 734
 735         list_for_each(node, &acpi_link.entries) {
 736
 737                 link = list_entry(node, struct acpi_pci_link, node);
 738                 if (!link) {
 739                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
 740                         continue;
 741                 }
 742
 743                 acpi_pci_link_resume(link);
 744         }
 745         return_VALUE(0);
 746 }
 747
 748
 749 static int
 750 acpi_pci_link_remove (
 751         struct acpi_device      *device,
 752         int                     type)
 753 {
 754         struct acpi_pci_link *link = NULL;
 755
 756         ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
 757
 758         if (!device || !acpi_driver_data(device))
 759                 return_VALUE(-EINVAL);
 760
 761         link = (struct acpi_pci_link *) acpi_driver_data(device);
 762
 763         /* TBD: Acquire/release lock */
 764         list_del(&link->node);
 765
 766         kfree(link);
 767
 768         return_VALUE(0);
 769 }
 770
 771 /*
 772  * modify acpi_irq_penalty[] from cmdline
 773  */
 774 static int __init acpi_irq_penalty_update(char *str, int used)
 775 {
 776         int i;
 777
 778         for (i = 0; i < 16; i++) {
 779                 int retval;
 780                 int irq;
 781
 782                 retval = get_option(&str,&irq);
 783
 784                 if (!retval)
 785                         break;  /* no number found */
 786
 787                 if (irq < 0)
 788                         continue;
 789
 790                 if (irq >= ACPI_MAX_IRQS)
 791                         continue;
 792
 793                 if (used)
 794                         acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
 795                 else
 796                         acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
 797
 798                 if (retval != 2)        /* no next number */
 799                         break;
 800         }
 801         return 1;
 802 }
 803
 804 /*
 805  * We'd like PNP to call this routine for the
 806  * single ISA_USED value for each legacy device.
 807  * But instead it calls us with each POSSIBLE setting.
 808  * There is no ISA_POSSIBLE weight, so we simply use
 809  * the (small) PCI_USING penalty.
 810  */
 811 void acpi_penalize_isa_irq(int irq)
 812 {
 813         acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
 814 }
 815
 816 /*
 817  * Over-ride default table to reserve additional IRQs for use by ISA
 818  * e.g. acpi_irq_isa=5
 819  * Useful for telling ACPI how not to interfere with your ISA sound card.
 820  */
 821 static int __init acpi_irq_isa(char *str)
 822 {
 823         return acpi_irq_penalty_update(str, 1);
 824 }
 825 __setup("acpi_irq_isa=", acpi_irq_isa);
 826
 827 /*
 828  * Over-ride default table to free additional IRQs for use by PCI
 829  * e.g. acpi_irq_pci=7,15
 830  * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
 831  */
 832 static int __init acpi_irq_pci(char *str)
 833 {
 834         return acpi_irq_penalty_update(str, 0);
 835 }
 836 __setup("acpi_irq_pci=", acpi_irq_pci);
 837
 838 static int __init acpi_irq_nobalance_set(char *str)
 839 {
 840         acpi_irq_balance = 0;
 841         return 1;
 842 }
 843 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
 844
 845 int __init acpi_irq_balance_set(char *str)
 846 {
 847         acpi_irq_balance = 1;
 848         return 1;
 849 }
 850 __setup("acpi_irq_balance", acpi_irq_balance_set);
 851
 852
 853 static struct sysdev_class irqrouter_sysdev_class = {
 854         set_kset_name("irqrouter"),
 855         .resume = irqrouter_resume,
 856 };
 857
 858
 859 static struct sys_device device_irqrouter = {
 860         .id     = 0,
 861         .cls    = &irqrouter_sysdev_class,
 862 };
 863
 864
 865 static int __init irqrouter_init_sysfs(void)
 866 {
 867         int error;
 868
 869         ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
 870
 871         if (acpi_disabled || acpi_noirq)
 872                 return_VALUE(0);
 873
 874         error = sysdev_class_register(&irqrouter_sysdev_class);
 875         if (!error)
 876                 error = sysdev_register(&device_irqrouter);
 877
 878         return_VALUE(error);
 879 }
 880
 881 device_initcall(irqrouter_init_sysfs);
 882
 883
 884 static int __init acpi_pci_link_init (void)
 885 {
 886         ACPI_FUNCTION_TRACE("acpi_pci_link_init");
 887
 888         if (acpi_noirq)
 889                 return_VALUE(0);
 890
 891         acpi_link.count = 0;
 892         INIT_LIST_HEAD(&acpi_link.entries);
 893
 894         if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
 895                 return_VALUE(-ENODEV);
 896
 897         return_VALUE(0);
 898 }
 899
 900 subsys_initcall(acpi_pci_link_init);