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   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 #ifdef CONFIG_PCI
 290 static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
 291                             unsigned int irq)
 292 {
 293         u32 class;
 294         u8 progif;
 295
 296         if (pci->irq == irq) {
 297                 pnp_dbg(&pnp->dev, "  device %s using irq %d\n",
 298                         pci_name(pci), irq);
 299                 return 1;
 300         }
 301
 302         /*
 303          * See pci_setup_device() and ata_pci_sff_activate_host() for
 304          * similar IDE legacy detection.
 305          */
 306         pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
 307         class >>= 8;            /* discard revision ID */
 308         progif = class & 0xff;
 309         class >>= 8;
 310
 311         if (class == PCI_CLASS_STORAGE_IDE) {
 312                 /*
 313                  * Unless both channels are native-PCI mode only,
 314                  * treat the compatibility IRQs as busy.
 315                  */
 316                 if ((progif & 0x5) != 0x5)
 317                         if (pci_get_legacy_ide_irq(pci, 0) == irq ||
 318                             pci_get_legacy_ide_irq(pci, 1) == irq) {
 319                                 pnp_dbg(&pnp->dev, "  legacy IDE device %s "
 320                                         "using irq %d\n", pci_name(pci), irq);
 321                                 return 1;
 322                         }
 323         }
 324
 325         return 0;
 326 }
 327 #endif
 328
 329 static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
 330 {
 331 #ifdef CONFIG_PCI
 332         struct pci_dev *pci = NULL;
 333
 334         for_each_pci_dev(pci) {
 335                 if (pci_dev_uses_irq(pnp, pci, irq)) {
 336                         pci_dev_put(pci);
 337                         return 1;
 338                 }
 339         }
 340 #endif
 341         return 0;
 342 }
 343
 344 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 345 {
 346         int i;
 347         struct pnp_dev *tdev;
 348         struct resource *tres;
 349         resource_size_t *irq;
 350
 351         irq = &res->start;
 352
 353         /* if the resource doesn't exist, don't complain about it */
 354         if (cannot_compare(res->flags))
 355                 return 1;
 356
 357         /* check if the resource is valid */
 358         if (*irq < 0 || *irq > 15)
 359                 return 0;
 360
 361         /* check if the resource is reserved */
 362         for (i = 0; i < 16; i++) {
 363                 if (pnp_reserve_irq[i] == *irq)
 364                         return 0;
 365         }
 366
 367         /* check for internal conflicts */
 368         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
 369                 if (tres != res && tres->flags & IORESOURCE_IRQ) {
 370                         if (tres->start == *irq)
 371                                 return 0;
 372                 }
 373         }
 374
 375         /* check if the resource is being used by a pci device */
 376         if (pci_uses_irq(dev, *irq))
 377                 return 0;
 378
 379         /* check if the resource is already in use, skip if the
 380          * device is active because it itself may be in use */
 381         if (!dev->active) {
 382                 if (request_irq(*irq, pnp_test_handler,
 383                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 384                         return 0;
 385                 free_irq(*irq, NULL);
 386         }
 387
 388         /* check for conflicts with other pnp devices */
 389         pnp_for_each_dev(tdev) {
 390                 if (tdev == dev)
 391                         continue;
 392                 for (i = 0;
 393                      (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
 394                      i++) {
 395                         if (tres->flags & IORESOURCE_IRQ) {
 396                                 if (cannot_compare(tres->flags))
 397                                         continue;
 398                                 if (tres->start == *irq)
 399                                         return 0;
 400                         }
 401                 }
 402         }
 403
 404         return 1;
 405 }
 406
 407 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 408 {
 409 #ifndef CONFIG_IA64
 410         int i;
 411         struct pnp_dev *tdev;
 412         struct resource *tres;
 413         resource_size_t *dma;
 414
 415         dma = &res->start;
 416
 417         /* if the resource doesn't exist, don't complain about it */
 418         if (cannot_compare(res->flags))
 419                 return 1;
 420
 421         /* check if the resource is valid */
 422         if (*dma < 0 || *dma == 4 || *dma > 7)
 423                 return 0;
 424
 425         /* check if the resource is reserved */
 426         for (i = 0; i < 8; i++) {
 427                 if (pnp_reserve_dma[i] == *dma)
 428                         return 0;
 429         }
 430
 431         /* check for internal conflicts */
 432         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
 433                 if (tres != res && tres->flags & IORESOURCE_DMA) {
 434                         if (tres->start == *dma)
 435                                 return 0;
 436                 }
 437         }
 438
 439         /* check if the resource is already in use, skip if the
 440          * device is active because it itself may be in use */
 441         if (!dev->active) {
 442                 if (request_dma(*dma, "pnp"))
 443                         return 0;
 444                 free_dma(*dma);
 445         }
 446
 447         /* check for conflicts with other pnp devices */
 448         pnp_for_each_dev(tdev) {
 449                 if (tdev == dev)
 450                         continue;
 451                 for (i = 0;
 452                      (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
 453                      i++) {
 454                         if (tres->flags & IORESOURCE_DMA) {
 455                                 if (cannot_compare(tres->flags))
 456                                         continue;
 457                                 if (tres->start == *dma)
 458                                         return 0;
 459                         }
 460                 }
 461         }
 462
 463         return 1;
 464 #else
 465         /* IA64 does not have legacy DMA */
 466         return 0;
 467 #endif
 468 }
 469
 470 unsigned long pnp_resource_type(struct resource *res)
 471 {
 472         return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 473                              IORESOURCE_IRQ | IORESOURCE_DMA);
 474 }
 475
 476 struct resource *pnp_get_resource(struct pnp_dev *dev,
 477                                   unsigned long type, unsigned int num)
 478 {
 479         struct pnp_resource *pnp_res;
 480         struct resource *res;
 481
 482         list_for_each_entry(pnp_res, &dev->resources, list) {
 483                 res = &pnp_res->res;
 484                 if (pnp_resource_type(res) == type && num-- == 0)
 485                         return res;
 486         }
 487         return NULL;
 488 }
 489 EXPORT_SYMBOL(pnp_get_resource);
 490
 491 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 492 {
 493         struct pnp_resource *pnp_res;
 494
 495         pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 496         if (!pnp_res)
 497                 return NULL;
 498
 499         list_add_tail(&pnp_res->list, &dev->resources);
 500         return pnp_res;
 501 }
 502
 503 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 504                                           int flags)
 505 {
 506         struct pnp_resource *pnp_res;
 507         struct resource *res;
 508
 509         pnp_res = pnp_new_resource(dev);
 510         if (!pnp_res) {
 511                 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 512                 return NULL;
 513         }
 514
 515         res = &pnp_res->res;
 516         res->flags = IORESOURCE_IRQ | flags;
 517         res->start = irq;
 518         res->end = irq;
 519
 520         pnp_dbg(&dev->dev, "  add %pr\n", res);
 521         return pnp_res;
 522 }
 523
 524 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 525                                           int flags)
 526 {
 527         struct pnp_resource *pnp_res;
 528         struct resource *res;
 529
 530         pnp_res = pnp_new_resource(dev);
 531         if (!pnp_res) {
 532                 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 533                 return NULL;
 534         }
 535
 536         res = &pnp_res->res;
 537         res->flags = IORESOURCE_DMA | flags;
 538         res->start = dma;
 539         res->end = dma;
 540
 541         pnp_dbg(&dev->dev, "  add %pr\n", res);
 542         return pnp_res;
 543 }
 544
 545 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 546                                          resource_size_t start,
 547                                          resource_size_t end, int flags)
 548 {
 549         struct pnp_resource *pnp_res;
 550         struct resource *res;
 551
 552         pnp_res = pnp_new_resource(dev);
 553         if (!pnp_res) {
 554                 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 555                         (unsigned long long) start,
 556                         (unsigned long long) end);
 557                 return NULL;
 558         }
 559
 560         res = &pnp_res->res;
 561         res->flags = IORESOURCE_IO | flags;
 562         res->start = start;
 563         res->end = end;
 564
 565         pnp_dbg(&dev->dev, "  add %pr\n", res);
 566         return pnp_res;
 567 }
 568
 569 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 570                                           resource_size_t start,
 571                                           resource_size_t end, int flags)
 572 {
 573         struct pnp_resource *pnp_res;
 574         struct resource *res;
 575
 576         pnp_res = pnp_new_resource(dev);
 577         if (!pnp_res) {
 578                 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 579                         (unsigned long long) start,
 580                         (unsigned long long) end);
 581                 return NULL;
 582         }
 583
 584         res = &pnp_res->res;
 585         res->flags = IORESOURCE_MEM | flags;
 586         res->start = start;
 587         res->end = end;
 588
 589         pnp_dbg(&dev->dev, "  add %pr\n", res);
 590         return pnp_res;
 591 }
 592
 593 /*
 594  * Determine whether the specified resource is a possible configuration
 595  * for this device.
 596  */
 597 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 598                         resource_size_t size)
 599 {
 600         struct pnp_option *option;
 601         struct pnp_port *port;
 602         struct pnp_mem *mem;
 603         struct pnp_irq *irq;
 604         struct pnp_dma *dma;
 605
 606         list_for_each_entry(option, &dev->options, list) {
 607                 if (option->type != type)
 608                         continue;
 609
 610                 switch (option->type) {
 611                 case IORESOURCE_IO:
 612                         port = &option->u.port;
 613                         if (port->min == start && port->size == size)
 614                                 return 1;
 615                         break;
 616                 case IORESOURCE_MEM:
 617                         mem = &option->u.mem;
 618                         if (mem->min == start && mem->size == size)
 619                                 return 1;
 620                         break;
 621                 case IORESOURCE_IRQ:
 622                         irq = &option->u.irq;
 623                         if (start < PNP_IRQ_NR &&
 624                             test_bit(start, irq->map.bits))
 625                                 return 1;
 626                         break;
 627                 case IORESOURCE_DMA:
 628                         dma = &option->u.dma;
 629                         if (dma->map & (1 << start))
 630                                 return 1;
 631                         break;
 632                 }
 633         }
 634
 635         return 0;
 636 }
 637 EXPORT_SYMBOL(pnp_possible_config);
 638
 639 int pnp_range_reserved(resource_size_t start, resource_size_t end)
 640 {
 641         struct pnp_dev *dev;
 642         struct pnp_resource *pnp_res;
 643         resource_size_t *dev_start, *dev_end;
 644
 645         pnp_for_each_dev(dev) {
 646                 list_for_each_entry(pnp_res, &dev->resources, list) {
 647                         dev_start = &pnp_res->res.start;
 648                         dev_end   = &pnp_res->res.end;
 649                         if (ranged_conflict(&start, &end, dev_start, dev_end))
 650                                 return 1;
 651                 }
 652         }
 653         return 0;
 654 }
 655 EXPORT_SYMBOL(pnp_range_reserved);
 656
 657 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 658 static int __init pnp_setup_reserve_irq(char *str)
 659 {
 660         int i;
 661
 662         for (i = 0; i < 16; i++)
 663                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 664                         break;
 665         return 1;
 666 }
 667
 668 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 669
 670 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 671 static int __init pnp_setup_reserve_dma(char *str)
 672 {
 673         int i;
 674
 675         for (i = 0; i < 8; i++)
 676                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 677                         break;
 678         return 1;
 679 }
 680
 681 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 682
 683 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 684 static int __init pnp_setup_reserve_io(char *str)
 685 {
 686         int i;
 687
 688         for (i = 0; i < 16; i++)
 689                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 690                         break;
 691         return 1;
 692 }
 693
 694 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 695
 696 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 697 static int __init pnp_setup_reserve_mem(char *str)
 698 {
 699         int i;
 700
 701         for (i = 0; i < 16; i++)
 702                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 703                         break;
 704         return 1;
 705 }
 706
 707 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);