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  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   7  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/errno.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel.h>
  14 #include <asm/io.h>
  15 #include <asm/dma.h>
  16 #include <asm/irq.h>
  17 #include <linux/pci.h>
  18 #include <linux/ioport.h>
  19 #include <linux/init.h>
  20
  21 #include <linux/pnp.h>
  22 #include "base.h"
  23
  24 static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some IRQ */
  25 static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };      /* reserve (don't use) some DMA */
  26 static int pnp_reserve_io[16] = {[0 ... 15] = -1 };     /* reserve (don't use) some I/O region */
  27 static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some memory region */
  28
  29 /*
  30  * option registration
  31  */
  32
  33 struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
  34                                     unsigned int option_flags)
  35 {
  36         struct pnp_option *option;
  37
  38         option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
  39         if (!option)
  40                 return NULL;
  41
  42         option->flags = option_flags;
  43         option->type = type;
  44
  45         list_add_tail(&option->list, &dev->options);
  46         return option;
  47 }
  48
  49 int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
  50                               pnp_irq_mask_t *map, unsigned char flags)
  51 {
  52         struct pnp_option *option;
  53         struct pnp_irq *irq;
  54
  55         option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
  56         if (!option)
  57                 return -ENOMEM;
  58
  59         irq = &option->u.irq;
  60         irq->map = *map;
  61         irq->flags = flags;
  62
  63 #ifdef CONFIG_PCI
  64         {
  65                 int i;
  66
  67                 for (i = 0; i < 16; i++)
  68                         if (test_bit(i, irq->map.bits))
  69                                 pcibios_penalize_isa_irq(i, 0);
  70         }
  71 #endif
  72
  73         dbg_pnp_show_option(dev, option);
  74         return 0;
  75 }
  76
  77 int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
  78                               unsigned char map, unsigned char flags)
  79 {
  80         struct pnp_option *option;
  81         struct pnp_dma *dma;
  82
  83         option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
  84         if (!option)
  85                 return -ENOMEM;
  86
  87         dma = &option->u.dma;
  88         dma->map = map;
  89         dma->flags = flags;
  90
  91         dbg_pnp_show_option(dev, option);
  92         return 0;
  93 }
  94
  95 int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
  96                                resource_size_t min, resource_size_t max,
  97                                resource_size_t align, resource_size_t size,
  98                                unsigned char flags)
  99 {
 100         struct pnp_option *option;
 101         struct pnp_port *port;
 102
 103         option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
 104         if (!option)
 105                 return -ENOMEM;
 106
 107         port = &option->u.port;
 108         port->min = min;
 109         port->max = max;
 110         port->align = align;
 111         port->size = size;
 112         port->flags = flags;
 113
 114         dbg_pnp_show_option(dev, option);
 115         return 0;
 116 }
 117
 118 int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
 119                               resource_size_t min, resource_size_t max,
 120                               resource_size_t align, resource_size_t size,
 121                               unsigned char flags)
 122 {
 123         struct pnp_option *option;
 124         struct pnp_mem *mem;
 125
 126         option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
 127         if (!option)
 128                 return -ENOMEM;
 129
 130         mem = &option->u.mem;
 131         mem->min = min;
 132         mem->max = max;
 133         mem->align = align;
 134         mem->size = size;
 135         mem->flags = flags;
 136
 137         dbg_pnp_show_option(dev, option);
 138         return 0;
 139 }
 140
 141 void pnp_free_options(struct pnp_dev *dev)
 142 {
 143         struct pnp_option *option, *tmp;
 144
 145         list_for_each_entry_safe(option, tmp, &dev->options, list) {
 146                 list_del(&option->list);
 147                 kfree(option);
 148         }
 149 }
 150
 151 /*
 152  * resource validity checking
 153  */
 154
 155 #define length(start, end) (*(end) - *(start) + 1)
 156
 157 /* Two ranges conflict if one doesn't end before the other starts */
 158 #define ranged_conflict(starta, enda, startb, endb) \
 159         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
 160
 161 #define cannot_compare(flags) \
 162 ((flags) & IORESOURCE_DISABLED)
 163
 164 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
 165 {
 166         int i;
 167         struct pnp_dev *tdev;
 168         struct resource *tres;
 169         resource_size_t *port, *end, *tport, *tend;
 170
 171         port = &res->start;
 172         end = &res->end;
 173
 174         /* if the resource doesn't exist, don't complain about it */
 175         if (cannot_compare(res->flags))
 176                 return 1;
 177
 178         /* check if the resource is already in use, skip if the
 179          * device is active because it itself may be in use */
 180         if (!dev->active) {
 181                 if (__check_region(&ioport_resource, *port, length(port, end)))
 182                         return 0;
 183         }
 184
 185         /* check if the resource is reserved */
 186         for (i = 0; i < 8; i++) {
 187                 int rport = pnp_reserve_io[i << 1];
 188                 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
 189                 if (ranged_conflict(port, end, &rport, &rend))
 190                         return 0;
 191         }
 192
 193         /* check for internal conflicts */
 194         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
 195                 if (tres != res && tres->flags & IORESOURCE_IO) {
 196                         tport = &tres->start;
 197                         tend = &tres->end;
 198                         if (ranged_conflict(port, end, tport, tend))
 199                                 return 0;
 200                 }
 201         }
 202
 203         /* check for conflicts with other pnp devices */
 204         pnp_for_each_dev(tdev) {
 205                 if (tdev == dev)
 206                         continue;
 207                 for (i = 0;
 208                      (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
 209                      i++) {
 210                         if (tres->flags & IORESOURCE_IO) {
 211                                 if (cannot_compare(tres->flags))
 212                                         continue;
 213                                 tport = &tres->start;
 214                                 tend = &tres->end;
 215                                 if (ranged_conflict(port, end, tport, tend))
 216                                         return 0;
 217                         }
 218                 }
 219         }
 220
 221         return 1;
 222 }
 223
 224 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
 225 {
 226         int i;
 227         struct pnp_dev *tdev;
 228         struct resource *tres;
 229         resource_size_t *addr, *end, *taddr, *tend;
 230
 231         addr = &res->start;
 232         end = &res->end;
 233
 234         /* if the resource doesn't exist, don't complain about it */
 235         if (cannot_compare(res->flags))
 236                 return 1;
 237
 238         /* check if the resource is already in use, skip if the
 239          * device is active because it itself may be in use */
 240         if (!dev->active) {
 241                 if (check_mem_region(*addr, length(addr, end)))
 242                         return 0;
 243         }
 244
 245         /* check if the resource is reserved */
 246         for (i = 0; i < 8; i++) {
 247                 int raddr = pnp_reserve_mem[i << 1];
 248                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 249                 if (ranged_conflict(addr, end, &raddr, &rend))
 250                         return 0;
 251         }
 252
 253         /* check for internal conflicts */
 254         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
 255                 if (tres != res && tres->flags & IORESOURCE_MEM) {
 256                         taddr = &tres->start;
 257                         tend = &tres->end;
 258                         if (ranged_conflict(addr, end, taddr, tend))
 259                                 return 0;
 260                 }
 261         }
 262
 263         /* check for conflicts with other pnp devices */
 264         pnp_for_each_dev(tdev) {
 265                 if (tdev == dev)
 266                         continue;
 267                 for (i = 0;
 268                      (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
 269                      i++) {
 270                         if (tres->flags & IORESOURCE_MEM) {
 271                                 if (cannot_compare(tres->flags))
 272                                         continue;
 273                                 taddr = &tres->start;
 274                                 tend = &tres->end;
 275                                 if (ranged_conflict(addr, end, taddr, tend))
 276                                         return 0;
 277                         }
 278                 }
 279         }
 280
 281         return 1;
 282 }
 283
 284 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 285 {
 286         return IRQ_HANDLED;
 287 }
 288
 289 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 290 {
 291         int i;
 292         struct pnp_dev *tdev;
 293         struct resource *tres;
 294         resource_size_t *irq;
 295
 296         irq = &res->start;
 297
 298         /* if the resource doesn't exist, don't complain about it */
 299         if (cannot_compare(res->flags))
 300                 return 1;
 301
 302         /* check if the resource is valid */
 303         if (*irq < 0 || *irq > 15)
 304                 return 0;
 305
 306         /* check if the resource is reserved */
 307         for (i = 0; i < 16; i++) {
 308                 if (pnp_reserve_irq[i] == *irq)
 309                         return 0;
 310         }
 311
 312         /* check for internal conflicts */
 313         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
 314                 if (tres != res && tres->flags & IORESOURCE_IRQ) {
 315                         if (tres->start == *irq)
 316                                 return 0;
 317                 }
 318         }
 319
 320 #ifdef CONFIG_PCI
 321         /* check if the resource is being used by a pci device */
 322         {
 323                 struct pci_dev *pci = NULL;
 324                 for_each_pci_dev(pci) {
 325                         if (pci->irq == *irq) {
 326                                 pci_dev_put(pci);
 327                                 return 0;
 328                         }
 329                 }
 330         }
 331 #endif
 332
 333         /* check if the resource is already in use, skip if the
 334          * device is active because it itself may be in use */
 335         if (!dev->active) {
 336                 if (request_irq(*irq, pnp_test_handler,
 337                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 338                         return 0;
 339                 free_irq(*irq, NULL);
 340         }
 341
 342         /* check for conflicts with other pnp devices */
 343         pnp_for_each_dev(tdev) {
 344                 if (tdev == dev)
 345                         continue;
 346                 for (i = 0;
 347                      (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
 348                      i++) {
 349                         if (tres->flags & IORESOURCE_IRQ) {
 350                                 if (cannot_compare(tres->flags))
 351                                         continue;
 352                                 if (tres->start == *irq)
 353                                         return 0;
 354                         }
 355                 }
 356         }
 357
 358         return 1;
 359 }
 360
 361 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 362 {
 363 #ifndef CONFIG_IA64
 364         int i;
 365         struct pnp_dev *tdev;
 366         struct resource *tres;
 367         resource_size_t *dma;
 368
 369         dma = &res->start;
 370
 371         /* if the resource doesn't exist, don't complain about it */
 372         if (cannot_compare(res->flags))
 373                 return 1;
 374
 375         /* check if the resource is valid */
 376         if (*dma < 0 || *dma == 4 || *dma > 7)
 377                 return 0;
 378
 379         /* check if the resource is reserved */
 380         for (i = 0; i < 8; i++) {
 381                 if (pnp_reserve_dma[i] == *dma)
 382                         return 0;
 383         }
 384
 385         /* check for internal conflicts */
 386         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
 387                 if (tres != res && tres->flags & IORESOURCE_DMA) {
 388                         if (tres->start == *dma)
 389                                 return 0;
 390                 }
 391         }
 392
 393         /* check if the resource is already in use, skip if the
 394          * device is active because it itself may be in use */
 395         if (!dev->active) {
 396                 if (request_dma(*dma, "pnp"))
 397                         return 0;
 398                 free_dma(*dma);
 399         }
 400
 401         /* check for conflicts with other pnp devices */
 402         pnp_for_each_dev(tdev) {
 403                 if (tdev == dev)
 404                         continue;
 405                 for (i = 0;
 406                      (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
 407                      i++) {
 408                         if (tres->flags & IORESOURCE_DMA) {
 409                                 if (cannot_compare(tres->flags))
 410                                         continue;
 411                                 if (tres->start == *dma)
 412                                         return 0;
 413                         }
 414                 }
 415         }
 416
 417         return 1;
 418 #else
 419         /* IA64 does not have legacy DMA */
 420         return 0;
 421 #endif
 422 }
 423
 424 int pnp_resource_type(struct resource *res)
 425 {
 426         return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 427                              IORESOURCE_IRQ | IORESOURCE_DMA);
 428 }
 429
 430 struct resource *pnp_get_resource(struct pnp_dev *dev,
 431                                   unsigned int type, unsigned int num)
 432 {
 433         struct pnp_resource *pnp_res;
 434         struct resource *res;
 435
 436         list_for_each_entry(pnp_res, &dev->resources, list) {
 437                 res = &pnp_res->res;
 438                 if (pnp_resource_type(res) == type && num-- == 0)
 439                         return res;
 440         }
 441         return NULL;
 442 }
 443 EXPORT_SYMBOL(pnp_get_resource);
 444
 445 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 446 {
 447         struct pnp_resource *pnp_res;
 448
 449         pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 450         if (!pnp_res)
 451                 return NULL;
 452
 453         list_add_tail(&pnp_res->list, &dev->resources);
 454         return pnp_res;
 455 }
 456
 457 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 458                                           int flags)
 459 {
 460         struct pnp_resource *pnp_res;
 461         struct resource *res;
 462
 463         pnp_res = pnp_new_resource(dev);
 464         if (!pnp_res) {
 465                 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 466                 return NULL;
 467         }
 468
 469         res = &pnp_res->res;
 470         res->flags = IORESOURCE_IRQ | flags;
 471         res->start = irq;
 472         res->end = irq;
 473
 474         dev_dbg(&dev->dev, "  add irq %d flags %#x\n", irq, flags);
 475         return pnp_res;
 476 }
 477
 478 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 479                                           int flags)
 480 {
 481         struct pnp_resource *pnp_res;
 482         struct resource *res;
 483
 484         pnp_res = pnp_new_resource(dev);
 485         if (!pnp_res) {
 486                 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 487                 return NULL;
 488         }
 489
 490         res = &pnp_res->res;
 491         res->flags = IORESOURCE_DMA | flags;
 492         res->start = dma;
 493         res->end = dma;
 494
 495         dev_dbg(&dev->dev, "  add dma %d flags %#x\n", dma, flags);
 496         return pnp_res;
 497 }
 498
 499 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 500                                          resource_size_t start,
 501                                          resource_size_t end, int flags)
 502 {
 503         struct pnp_resource *pnp_res;
 504         struct resource *res;
 505
 506         pnp_res = pnp_new_resource(dev);
 507         if (!pnp_res) {
 508                 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 509                         (unsigned long long) start,
 510                         (unsigned long long) end);
 511                 return NULL;
 512         }
 513
 514         res = &pnp_res->res;
 515         res->flags = IORESOURCE_IO | flags;
 516         res->start = start;
 517         res->end = end;
 518
 519         dev_dbg(&dev->dev, "  add io  %#llx-%#llx flags %#x\n",
 520                 (unsigned long long) start, (unsigned long long) end, flags);
 521         return pnp_res;
 522 }
 523
 524 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 525                                           resource_size_t start,
 526                                           resource_size_t end, int flags)
 527 {
 528         struct pnp_resource *pnp_res;
 529         struct resource *res;
 530
 531         pnp_res = pnp_new_resource(dev);
 532         if (!pnp_res) {
 533                 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 534                         (unsigned long long) start,
 535                         (unsigned long long) end);
 536                 return NULL;
 537         }
 538
 539         res = &pnp_res->res;
 540         res->flags = IORESOURCE_MEM | flags;
 541         res->start = start;
 542         res->end = end;
 543
 544         dev_dbg(&dev->dev, "  add mem %#llx-%#llx flags %#x\n",
 545                 (unsigned long long) start, (unsigned long long) end, flags);
 546         return pnp_res;
 547 }
 548
 549 /*
 550  * Determine whether the specified resource is a possible configuration
 551  * for this device.
 552  */
 553 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 554                         resource_size_t size)
 555 {
 556         struct pnp_option *option;
 557         struct pnp_port *port;
 558         struct pnp_mem *mem;
 559         struct pnp_irq *irq;
 560         struct pnp_dma *dma;
 561
 562         list_for_each_entry(option, &dev->options, list) {
 563                 if (option->type != type)
 564                         continue;
 565
 566                 switch (option->type) {
 567                 case IORESOURCE_IO:
 568                         port = &option->u.port;
 569                         if (port->min == start && port->size == size)
 570                                 return 1;
 571                         break;
 572                 case IORESOURCE_MEM:
 573                         mem = &option->u.mem;
 574                         if (mem->min == start && mem->size == size)
 575                                 return 1;
 576                         break;
 577                 case IORESOURCE_IRQ:
 578                         irq = &option->u.irq;
 579                         if (start < PNP_IRQ_NR &&
 580                             test_bit(start, irq->map.bits))
 581                                 return 1;
 582                         break;
 583                 case IORESOURCE_DMA:
 584                         dma = &option->u.dma;
 585                         if (dma->map & (1 << start))
 586                                 return 1;
 587                         break;
 588                 }
 589         }
 590
 591         return 0;
 592 }
 593 EXPORT_SYMBOL(pnp_possible_config);
 594
 595 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 596 static int __init pnp_setup_reserve_irq(char *str)
 597 {
 598         int i;
 599
 600         for (i = 0; i < 16; i++)
 601                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 602                         break;
 603         return 1;
 604 }
 605
 606 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 607
 608 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 609 static int __init pnp_setup_reserve_dma(char *str)
 610 {
 611         int i;
 612
 613         for (i = 0; i < 8; i++)
 614                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 615                         break;
 616         return 1;
 617 }
 618
 619 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 620
 621 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 622 static int __init pnp_setup_reserve_io(char *str)
 623 {
 624         int i;
 625
 626         for (i = 0; i < 16; i++)
 627                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 628                         break;
 629         return 1;
 630 }
 631
 632 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 633
 634 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 635 static int __init pnp_setup_reserve_mem(char *str)
 636 {
 637         int i;
 638
 639         for (i = 0; i < 16; i++)
 640                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 641                         break;
 642         return 1;
 643 }
 644
 645 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);