drivers/pnp/resource.c

   1 /*
   2  * resource.c - Contains functions for registering and analyzing resource information
   3  *
   4  * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
   5  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/errno.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/kernel.h>
  12 #include <asm/io.h>
  13 #include <asm/dma.h>
  14 #include <asm/irq.h>
  15 #include <linux/pci.h>
  16 #include <linux/ioport.h>
  17 #include <linux/init.h>
  18
  19 #include <linux/pnp.h>
  20 #include "base.h"
  21
  22 static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some IRQ */
  23 static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };      /* reserve (don't use) some DMA */
  24 static int pnp_reserve_io[16] = {[0 ... 15] = -1 };     /* reserve (don't use) some I/O region */
  25 static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some memory region */
  26
  27 /*
  28  * option registration
  29  */
  30
  31 struct pnp_option *pnp_build_option(int priority)
  32 {
  33         struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));
  34
  35         if (!option)
  36                 return NULL;
  37
  38         option->priority = priority & 0xff;
  39         /* make sure the priority is valid */
  40         if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
  41                 option->priority = PNP_RES_PRIORITY_INVALID;
  42
  43         return option;
  44 }
  45
  46 struct pnp_option *pnp_register_independent_option(struct pnp_dev *dev)
  47 {
  48         struct pnp_option *option;
  49
  50         option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);
  51
  52         /* this should never happen but if it does we'll try to continue */
  53         if (dev->independent)
  54                 dev_err(&dev->dev, "independent resource already registered\n");
  55         dev->independent = option;
  56
  57         dev_dbg(&dev->dev, "new independent option\n");
  58         return option;
  59 }
  60
  61 struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev,
  62                                                  int priority)
  63 {
  64         struct pnp_option *option;
  65
  66         option = pnp_build_option(priority);
  67
  68         if (dev->dependent) {
  69                 struct pnp_option *parent = dev->dependent;
  70                 while (parent->next)
  71                         parent = parent->next;
  72                 parent->next = option;
  73         } else
  74                 dev->dependent = option;
  75
  76         dev_dbg(&dev->dev, "new dependent option (priority %#x)\n", priority);
  77         return option;
  78 }
  79
  80 int pnp_register_irq_resource(struct pnp_dev *dev, struct pnp_option *option,
  81                               struct pnp_irq *data)
  82 {
  83         struct pnp_irq *ptr;
  84 #ifdef DEBUG
  85         char buf[PNP_IRQ_NR];   /* hex-encoded, so this is overkill but safe */
  86 #endif
  87
  88         ptr = option->irq;
  89         while (ptr && ptr->next)
  90                 ptr = ptr->next;
  91         if (ptr)
  92                 ptr->next = data;
  93         else
  94                 option->irq = data;
  95
  96 #ifdef CONFIG_PCI
  97         {
  98                 int i;
  99
 100                 for (i = 0; i < 16; i++)
 101                         if (test_bit(i, data->map.bits))
 102                                 pcibios_penalize_isa_irq(i, 0);
 103         }
 104 #endif
 105
 106 #ifdef DEBUG
 107         bitmap_scnprintf(buf, sizeof(buf), data->map.bits, PNP_IRQ_NR);
 108         dev_dbg(&dev->dev, "  irq bitmask %s flags %#x\n", buf,
 109                 data->flags);
 110 #endif
 111         return 0;
 112 }
 113
 114 int pnp_register_dma_resource(struct pnp_dev *dev, struct pnp_option *option,
 115                               struct pnp_dma *data)
 116 {
 117         struct pnp_dma *ptr;
 118
 119         ptr = option->dma;
 120         while (ptr && ptr->next)
 121                 ptr = ptr->next;
 122         if (ptr)
 123                 ptr->next = data;
 124         else
 125                 option->dma = data;
 126
 127         dev_dbg(&dev->dev, "  dma bitmask %#x flags %#x\n", data->map,
 128                 data->flags);
 129         return 0;
 130 }
 131
 132 int pnp_register_port_resource(struct pnp_dev *dev, struct pnp_option *option,
 133                                struct pnp_port *data)
 134 {
 135         struct pnp_port *ptr;
 136
 137         ptr = option->port;
 138         while (ptr && ptr->next)
 139                 ptr = ptr->next;
 140         if (ptr)
 141                 ptr->next = data;
 142         else
 143                 option->port = data;
 144
 145         dev_dbg(&dev->dev, "  io  "
 146                 "min %#llx max %#llx align %lld size %lld flags %#x\n",
 147                 (unsigned long long) data->min,
 148                 (unsigned long long) data->max,
 149                 (unsigned long long) data->align,
 150                 (unsigned long long) data->size, data->flags);
 151         return 0;
 152 }
 153
 154 int pnp_register_mem_resource(struct pnp_dev *dev, struct pnp_option *option,
 155                               struct pnp_mem *data)
 156 {
 157         struct pnp_mem *ptr;
 158
 159         ptr = option->mem;
 160         while (ptr && ptr->next)
 161                 ptr = ptr->next;
 162         if (ptr)
 163                 ptr->next = data;
 164         else
 165                 option->mem = data;
 166
 167         dev_dbg(&dev->dev, "  mem "
 168                 "min %#llx max %#llx align %lld size %lld flags %#x\n",
 169                 (unsigned long long) data->min,
 170                 (unsigned long long) data->max,
 171                 (unsigned long long) data->align,
 172                 (unsigned long long) data->size, data->flags);
 173         return 0;
 174 }
 175
 176 static void pnp_free_port(struct pnp_port *port)
 177 {
 178         struct pnp_port *next;
 179
 180         while (port) {
 181                 next = port->next;
 182                 kfree(port);
 183                 port = next;
 184         }
 185 }
 186
 187 static void pnp_free_irq(struct pnp_irq *irq)
 188 {
 189         struct pnp_irq *next;
 190
 191         while (irq) {
 192                 next = irq->next;
 193                 kfree(irq);
 194                 irq = next;
 195         }
 196 }
 197
 198 static void pnp_free_dma(struct pnp_dma *dma)
 199 {
 200         struct pnp_dma *next;
 201
 202         while (dma) {
 203                 next = dma->next;
 204                 kfree(dma);
 205                 dma = next;
 206         }
 207 }
 208
 209 static void pnp_free_mem(struct pnp_mem *mem)
 210 {
 211         struct pnp_mem *next;
 212
 213         while (mem) {
 214                 next = mem->next;
 215                 kfree(mem);
 216                 mem = next;
 217         }
 218 }
 219
 220 void pnp_free_option(struct pnp_option *option)
 221 {
 222         struct pnp_option *next;
 223
 224         while (option) {
 225                 next = option->next;
 226                 pnp_free_port(option->port);
 227                 pnp_free_irq(option->irq);
 228                 pnp_free_dma(option->dma);
 229                 pnp_free_mem(option->mem);
 230                 kfree(option);
 231                 option = next;
 232         }
 233 }
 234
 235 /*
 236  * resource validity checking
 237  */
 238
 239 #define length(start, end) (*(end) - *(start) + 1)
 240
 241 /* Two ranges conflict if one doesn't end before the other starts */
 242 #define ranged_conflict(starta, enda, startb, endb) \
 243         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
 244
 245 #define cannot_compare(flags) \
 246 ((flags) & IORESOURCE_DISABLED)
 247
 248 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
 249 {
 250         int i;
 251         struct pnp_dev *tdev;
 252         struct resource *tres;
 253         resource_size_t *port, *end, *tport, *tend;
 254
 255         port = &res->start;
 256         end = &res->end;
 257
 258         /* if the resource doesn't exist, don't complain about it */
 259         if (cannot_compare(res->flags))
 260                 return 1;
 261
 262         /* check if the resource is already in use, skip if the
 263          * device is active because it itself may be in use */
 264         if (!dev->active) {
 265                 if (__check_region(&ioport_resource, *port, length(port, end)))
 266                         return 0;
 267         }
 268
 269         /* check if the resource is reserved */
 270         for (i = 0; i < 8; i++) {
 271                 int rport = pnp_reserve_io[i << 1];
 272                 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
 273                 if (ranged_conflict(port, end, &rport, &rend))
 274                         return 0;
 275         }
 276
 277         /* check for internal conflicts */
 278         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
 279                 if (tres != res && tres->flags & IORESOURCE_IO) {
 280                         tport = &tres->start;
 281                         tend = &tres->end;
 282                         if (ranged_conflict(port, end, tport, tend))
 283                                 return 0;
 284                 }
 285         }
 286
 287         /* check for conflicts with other pnp devices */
 288         pnp_for_each_dev(tdev) {
 289                 if (tdev == dev)
 290                         continue;
 291                 for (i = 0;
 292                      (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
 293                      i++) {
 294                         if (tres->flags & IORESOURCE_IO) {
 295                                 if (cannot_compare(tres->flags))
 296                                         continue;
 297                                 tport = &tres->start;
 298                                 tend = &tres->end;
 299                                 if (ranged_conflict(port, end, tport, tend))
 300                                         return 0;
 301                         }
 302                 }
 303         }
 304
 305         return 1;
 306 }
 307
 308 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
 309 {
 310         int i;
 311         struct pnp_dev *tdev;
 312         struct resource *tres;
 313         resource_size_t *addr, *end, *taddr, *tend;
 314
 315         addr = &res->start;
 316         end = &res->end;
 317
 318         /* if the resource doesn't exist, don't complain about it */
 319         if (cannot_compare(res->flags))
 320                 return 1;
 321
 322         /* check if the resource is already in use, skip if the
 323          * device is active because it itself may be in use */
 324         if (!dev->active) {
 325                 if (check_mem_region(*addr, length(addr, end)))
 326                         return 0;
 327         }
 328
 329         /* check if the resource is reserved */
 330         for (i = 0; i < 8; i++) {
 331                 int raddr = pnp_reserve_mem[i << 1];
 332                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 333                 if (ranged_conflict(addr, end, &raddr, &rend))
 334                         return 0;
 335         }
 336
 337         /* check for internal conflicts */
 338         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
 339                 if (tres != res && tres->flags & IORESOURCE_MEM) {
 340                         taddr = &tres->start;
 341                         tend = &tres->end;
 342                         if (ranged_conflict(addr, end, taddr, tend))
 343                                 return 0;
 344                 }
 345         }
 346
 347         /* check for conflicts with other pnp devices */
 348         pnp_for_each_dev(tdev) {
 349                 if (tdev == dev)
 350                         continue;
 351                 for (i = 0;
 352                      (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
 353                      i++) {
 354                         if (tres->flags & IORESOURCE_MEM) {
 355                                 if (cannot_compare(tres->flags))
 356                                         continue;
 357                                 taddr = &tres->start;
 358                                 tend = &tres->end;
 359                                 if (ranged_conflict(addr, end, taddr, tend))
 360                                         return 0;
 361                         }
 362                 }
 363         }
 364
 365         return 1;
 366 }
 367
 368 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 369 {
 370         return IRQ_HANDLED;
 371 }
 372
 373 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 374 {
 375         int i;
 376         struct pnp_dev *tdev;
 377         struct resource *tres;
 378         resource_size_t *irq;
 379
 380         irq = &res->start;
 381
 382         /* if the resource doesn't exist, don't complain about it */
 383         if (cannot_compare(res->flags))
 384                 return 1;
 385
 386         /* check if the resource is valid */
 387         if (*irq < 0 || *irq > 15)
 388                 return 0;
 389
 390         /* check if the resource is reserved */
 391         for (i = 0; i < 16; i++) {
 392                 if (pnp_reserve_irq[i] == *irq)
 393                         return 0;
 394         }
 395
 396         /* check for internal conflicts */
 397         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
 398                 if (tres != res && tres->flags & IORESOURCE_IRQ) {
 399                         if (tres->start == *irq)
 400                                 return 0;
 401                 }
 402         }
 403
 404 #ifdef CONFIG_PCI
 405         /* check if the resource is being used by a pci device */
 406         {
 407                 struct pci_dev *pci = NULL;
 408                 for_each_pci_dev(pci) {
 409                         if (pci->irq == *irq) {
 410                                 pci_dev_put(pci);
 411                                 return 0;
 412                         }
 413                 }
 414         }
 415 #endif
 416
 417         /* check if the resource is already in use, skip if the
 418          * device is active because it itself may be in use */
 419         if (!dev->active) {
 420                 if (request_irq(*irq, pnp_test_handler,
 421                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 422                         return 0;
 423                 free_irq(*irq, NULL);
 424         }
 425
 426         /* check for conflicts with other pnp devices */
 427         pnp_for_each_dev(tdev) {
 428                 if (tdev == dev)
 429                         continue;
 430                 for (i = 0;
 431                      (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
 432                      i++) {
 433                         if (tres->flags & IORESOURCE_IRQ) {
 434                                 if (cannot_compare(tres->flags))
 435                                         continue;
 436                                 if (tres->start == *irq)
 437                                         return 0;
 438                         }
 439                 }
 440         }
 441
 442         return 1;
 443 }
 444
 445 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 446 {
 447 #ifndef CONFIG_IA64
 448         int i;
 449         struct pnp_dev *tdev;
 450         struct resource *tres;
 451         resource_size_t *dma;
 452
 453         dma = &res->start;
 454
 455         /* if the resource doesn't exist, don't complain about it */
 456         if (cannot_compare(res->flags))
 457                 return 1;
 458
 459         /* check if the resource is valid */
 460         if (*dma < 0 || *dma == 4 || *dma > 7)
 461                 return 0;
 462
 463         /* check if the resource is reserved */
 464         for (i = 0; i < 8; i++) {
 465                 if (pnp_reserve_dma[i] == *dma)
 466                         return 0;
 467         }
 468
 469         /* check for internal conflicts */
 470         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
 471                 if (tres != res && tres->flags & IORESOURCE_DMA) {
 472                         if (tres->start == *dma)
 473                                 return 0;
 474                 }
 475         }
 476
 477         /* check if the resource is already in use, skip if the
 478          * device is active because it itself may be in use */
 479         if (!dev->active) {
 480                 if (request_dma(*dma, "pnp"))
 481                         return 0;
 482                 free_dma(*dma);
 483         }
 484
 485         /* check for conflicts with other pnp devices */
 486         pnp_for_each_dev(tdev) {
 487                 if (tdev == dev)
 488                         continue;
 489                 for (i = 0;
 490                      (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
 491                      i++) {
 492                         if (tres->flags & IORESOURCE_DMA) {
 493                                 if (cannot_compare(tres->flags))
 494                                         continue;
 495                                 if (tres->start == *dma)
 496                                         return 0;
 497                         }
 498                 }
 499         }
 500
 501         return 1;
 502 #else
 503         /* IA64 does not have legacy DMA */
 504         return 0;
 505 #endif
 506 }
 507
 508 int pnp_resource_type(struct resource *res)
 509 {
 510         return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 511                              IORESOURCE_IRQ | IORESOURCE_DMA);
 512 }
 513
 514 struct resource *pnp_get_resource(struct pnp_dev *dev,
 515                                   unsigned int type, unsigned int num)
 516 {
 517         struct pnp_resource *pnp_res;
 518         struct resource *res;
 519
 520         list_for_each_entry(pnp_res, &dev->resources, list) {
 521                 res = &pnp_res->res;
 522                 if (pnp_resource_type(res) == type && num-- == 0)
 523                         return res;
 524         }
 525         return NULL;
 526 }
 527 EXPORT_SYMBOL(pnp_get_resource);
 528
 529 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 530 {
 531         struct pnp_resource *pnp_res;
 532
 533         pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 534         if (!pnp_res)
 535                 return NULL;
 536
 537         list_add_tail(&pnp_res->list, &dev->resources);
 538         return pnp_res;
 539 }
 540
 541 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 542                                           int flags)
 543 {
 544         struct pnp_resource *pnp_res;
 545         struct resource *res;
 546
 547         pnp_res = pnp_new_resource(dev);
 548         if (!pnp_res) {
 549                 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 550                 return NULL;
 551         }
 552
 553         res = &pnp_res->res;
 554         res->flags = IORESOURCE_IRQ | flags;
 555         res->start = irq;
 556         res->end = irq;
 557
 558         dev_dbg(&dev->dev, "  add irq %d flags %#x\n", irq, flags);
 559         return pnp_res;
 560 }
 561
 562 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 563                                           int flags)
 564 {
 565         struct pnp_resource *pnp_res;
 566         struct resource *res;
 567
 568         pnp_res = pnp_new_resource(dev);
 569         if (!pnp_res) {
 570                 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 571                 return NULL;
 572         }
 573
 574         res = &pnp_res->res;
 575         res->flags = IORESOURCE_DMA | flags;
 576         res->start = dma;
 577         res->end = dma;
 578
 579         dev_dbg(&dev->dev, "  add dma %d flags %#x\n", dma, flags);
 580         return pnp_res;
 581 }
 582
 583 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 584                                          resource_size_t start,
 585                                          resource_size_t end, int flags)
 586 {
 587         struct pnp_resource *pnp_res;
 588         struct resource *res;
 589
 590         pnp_res = pnp_new_resource(dev);
 591         if (!pnp_res) {
 592                 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 593                         (unsigned long long) start,
 594                         (unsigned long long) end);
 595                 return NULL;
 596         }
 597
 598         res = &pnp_res->res;
 599         res->flags = IORESOURCE_IO | flags;
 600         res->start = start;
 601         res->end = end;
 602
 603         dev_dbg(&dev->dev, "  add io  %#llx-%#llx flags %#x\n",
 604                 (unsigned long long) start, (unsigned long long) end, flags);
 605         return pnp_res;
 606 }
 607
 608 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 609                                           resource_size_t start,
 610                                           resource_size_t end, int flags)
 611 {
 612         struct pnp_resource *pnp_res;
 613         struct resource *res;
 614
 615         pnp_res = pnp_new_resource(dev);
 616         if (!pnp_res) {
 617                 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 618                         (unsigned long long) start,
 619                         (unsigned long long) end);
 620                 return NULL;
 621         }
 622
 623         res = &pnp_res->res;
 624         res->flags = IORESOURCE_MEM | flags;
 625         res->start = start;
 626         res->end = end;
 627
 628         dev_dbg(&dev->dev, "  add mem %#llx-%#llx flags %#x\n",
 629                 (unsigned long long) start, (unsigned long long) end, flags);
 630         return pnp_res;
 631 }
 632
 633 static int pnp_possible_option(struct pnp_option *option, int type,
 634                                resource_size_t start, resource_size_t size)
 635 {
 636         struct pnp_option *tmp;
 637         struct pnp_port *port;
 638         struct pnp_mem *mem;
 639         struct pnp_irq *irq;
 640         struct pnp_dma *dma;
 641
 642         if (!option)
 643                 return 0;
 644
 645         for (tmp = option; tmp; tmp = tmp->next) {
 646                 switch (type) {
 647                 case IORESOURCE_IO:
 648                         for (port = tmp->port; port; port = port->next) {
 649                                 if (port->min == start && port->size == size)
 650                                         return 1;
 651                         }
 652                         break;
 653                 case IORESOURCE_MEM:
 654                         for (mem = tmp->mem; mem; mem = mem->next) {
 655                                 if (mem->min == start && mem->size == size)
 656                                         return 1;
 657                         }
 658                         break;
 659                 case IORESOURCE_IRQ:
 660                         for (irq = tmp->irq; irq; irq = irq->next) {
 661                                 if (start < PNP_IRQ_NR &&
 662                                     test_bit(start, irq->map.bits))
 663                                         return 1;
 664                         }
 665                         break;
 666                 case IORESOURCE_DMA:
 667                         for (dma = tmp->dma; dma; dma = dma->next) {
 668                                 if (dma->map & (1 << start))
 669                                         return 1;
 670                         }
 671                         break;
 672                 }
 673         }
 674
 675         return 0;
 676 }
 677
 678 /*
 679  * Determine whether the specified resource is a possible configuration
 680  * for this device.
 681  */
 682 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 683                         resource_size_t size)
 684 {
 685         if (pnp_possible_option(dev->independent, type, start, size))
 686                 return 1;
 687
 688         if (pnp_possible_option(dev->dependent, type, start, size))
 689                 return 1;
 690
 691         return 0;
 692 }
 693 EXPORT_SYMBOL(pnp_possible_config);
 694
 695 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 696 static int __init pnp_setup_reserve_irq(char *str)
 697 {
 698         int i;
 699
 700         for (i = 0; i < 16; i++)
 701                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 702                         break;
 703         return 1;
 704 }
 705
 706 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 707
 708 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 709 static int __init pnp_setup_reserve_dma(char *str)
 710 {
 711         int i;
 712
 713         for (i = 0; i < 8; i++)
 714                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 715                         break;
 716         return 1;
 717 }
 718
 719 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 720
 721 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 722 static int __init pnp_setup_reserve_io(char *str)
 723 {
 724         int i;
 725
 726         for (i = 0; i < 16; i++)
 727                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 728                         break;
 729         return 1;
 730 }
 731
 732 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 733
 734 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 735 static int __init pnp_setup_reserve_mem(char *str)
 736 {
 737         int i;
 738
 739         for (i = 0; i < 16; i++)
 740                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 741                         break;
 742         return 1;
 743 }
 744
 745 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);