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 static 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))
 102                                 pcibios_penalize_isa_irq(i, 0);
 103         }
 104 #endif
 105
 106 #ifdef DEBUG
 107         bitmap_scnprintf(buf, sizeof(buf), data->map, 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 %#x max %#x align %d size %d flags %#x\n",
 147                 data->min, data->max, data->align, data->size, data->flags);
 148         return 0;
 149 }
 150
 151 int pnp_register_mem_resource(struct pnp_dev *dev, struct pnp_option *option,
 152                               struct pnp_mem *data)
 153 {
 154         struct pnp_mem *ptr;
 155
 156         ptr = option->mem;
 157         while (ptr && ptr->next)
 158                 ptr = ptr->next;
 159         if (ptr)
 160                 ptr->next = data;
 161         else
 162                 option->mem = data;
 163
 164         dev_dbg(&dev->dev, "  mem "
 165                 "min %#x max %#x align %d size %d flags %#x\n",
 166                 data->min, data->max, data->align, data->size, data->flags);
 167         return 0;
 168 }
 169
 170 static void pnp_free_port(struct pnp_port *port)
 171 {
 172         struct pnp_port *next;
 173
 174         while (port) {
 175                 next = port->next;
 176                 kfree(port);
 177                 port = next;
 178         }
 179 }
 180
 181 static void pnp_free_irq(struct pnp_irq *irq)
 182 {
 183         struct pnp_irq *next;
 184
 185         while (irq) {
 186                 next = irq->next;
 187                 kfree(irq);
 188                 irq = next;
 189         }
 190 }
 191
 192 static void pnp_free_dma(struct pnp_dma *dma)
 193 {
 194         struct pnp_dma *next;
 195
 196         while (dma) {
 197                 next = dma->next;
 198                 kfree(dma);
 199                 dma = next;
 200         }
 201 }
 202
 203 static void pnp_free_mem(struct pnp_mem *mem)
 204 {
 205         struct pnp_mem *next;
 206
 207         while (mem) {
 208                 next = mem->next;
 209                 kfree(mem);
 210                 mem = next;
 211         }
 212 }
 213
 214 void pnp_free_option(struct pnp_option *option)
 215 {
 216         struct pnp_option *next;
 217
 218         while (option) {
 219                 next = option->next;
 220                 pnp_free_port(option->port);
 221                 pnp_free_irq(option->irq);
 222                 pnp_free_dma(option->dma);
 223                 pnp_free_mem(option->mem);
 224                 kfree(option);
 225                 option = next;
 226         }
 227 }
 228
 229 /*
 230  * resource validity checking
 231  */
 232
 233 #define length(start, end) (*(end) - *(start) + 1)
 234
 235 /* Two ranges conflict if one doesn't end before the other starts */
 236 #define ranged_conflict(starta, enda, startb, endb) \
 237         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
 238
 239 #define cannot_compare(flags) \
 240 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
 241
 242 int pnp_check_port(struct pnp_dev *dev, int idx)
 243 {
 244         int i;
 245         struct pnp_dev *tdev;
 246         struct resource *res, *tres;
 247         resource_size_t *port, *end, *tport, *tend;
 248
 249         res = &dev->res.port_resource[idx];
 250         port = &res->start;
 251         end = &res->end;
 252
 253         /* if the resource doesn't exist, don't complain about it */
 254         if (cannot_compare(res->flags))
 255                 return 1;
 256
 257         /* check if the resource is already in use, skip if the
 258          * device is active because it itself may be in use */
 259         if (!dev->active) {
 260                 if (__check_region(&ioport_resource, *port, length(port, end)))
 261                         return 0;
 262         }
 263
 264         /* check if the resource is reserved */
 265         for (i = 0; i < 8; i++) {
 266                 int rport = pnp_reserve_io[i << 1];
 267                 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
 268                 if (ranged_conflict(port, end, &rport, &rend))
 269                         return 0;
 270         }
 271
 272         /* check for internal conflicts */
 273         for (i = 0; i < PNP_MAX_PORT && i != idx; i++) {
 274                 tres = &dev->res.port_resource[i];
 275                 if (tres->flags & IORESOURCE_IO) {
 276                         tport = &tres->start;
 277                         tend = &tres->end;
 278                         if (ranged_conflict(port, end, tport, tend))
 279                                 return 0;
 280                 }
 281         }
 282
 283         /* check for conflicts with other pnp devices */
 284         pnp_for_each_dev(tdev) {
 285                 if (tdev == dev)
 286                         continue;
 287                 for (i = 0; i < PNP_MAX_PORT; i++) {
 288                         tres = &tdev->res.port_resource[i];
 289                         if (tres->flags & IORESOURCE_IO) {
 290                                 if (cannot_compare(tres->flags))
 291                                         continue;
 292                                 tport = &tres->start;
 293                                 tend = &tres->end;
 294                                 if (ranged_conflict(port, end, tport, tend))
 295                                         return 0;
 296                         }
 297                 }
 298         }
 299
 300         return 1;
 301 }
 302
 303 int pnp_check_mem(struct pnp_dev *dev, int idx)
 304 {
 305         int i;
 306         struct pnp_dev *tdev;
 307         struct resource *res, *tres;
 308         resource_size_t *addr, *end, *taddr, *tend;
 309
 310         res = &dev->res.mem_resource[idx];
 311         addr = &res->start;
 312         end = &res->end;
 313
 314         /* if the resource doesn't exist, don't complain about it */
 315         if (cannot_compare(res->flags))
 316                 return 1;
 317
 318         /* check if the resource is already in use, skip if the
 319          * device is active because it itself may be in use */
 320         if (!dev->active) {
 321                 if (check_mem_region(*addr, length(addr, end)))
 322                         return 0;
 323         }
 324
 325         /* check if the resource is reserved */
 326         for (i = 0; i < 8; i++) {
 327                 int raddr = pnp_reserve_mem[i << 1];
 328                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 329                 if (ranged_conflict(addr, end, &raddr, &rend))
 330                         return 0;
 331         }
 332
 333         /* check for internal conflicts */
 334         for (i = 0; i < PNP_MAX_MEM && i != idx; i++) {
 335                 tres = &dev->res.mem_resource[i];
 336                 if (tres->flags & IORESOURCE_MEM) {
 337                         taddr = &tres->start;
 338                         tend = &tres->end;
 339                         if (ranged_conflict(addr, end, taddr, tend))
 340                                 return 0;
 341                 }
 342         }
 343
 344         /* check for conflicts with other pnp devices */
 345         pnp_for_each_dev(tdev) {
 346                 if (tdev == dev)
 347                         continue;
 348                 for (i = 0; i < PNP_MAX_MEM; i++) {
 349                         tres = &tdev->res.mem_resource[i];
 350                         if (tres->flags & IORESOURCE_MEM) {
 351                                 if (cannot_compare(tres->flags))
 352                                         continue;
 353                                 taddr = &tres->start;
 354                                 tend = &tres->end;
 355                                 if (ranged_conflict(addr, end, taddr, tend))
 356                                         return 0;
 357                         }
 358                 }
 359         }
 360
 361         return 1;
 362 }
 363
 364 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 365 {
 366         return IRQ_HANDLED;
 367 }
 368
 369 int pnp_check_irq(struct pnp_dev *dev, int idx)
 370 {
 371         int i;
 372         struct pnp_dev *tdev;
 373         struct resource *res, *tres;
 374         resource_size_t *irq;
 375
 376         res = &dev->res.irq_resource[idx];
 377         irq = &res->start;
 378
 379         /* if the resource doesn't exist, don't complain about it */
 380         if (cannot_compare(res->flags))
 381                 return 1;
 382
 383         /* check if the resource is valid */
 384         if (*irq < 0 || *irq > 15)
 385                 return 0;
 386
 387         /* check if the resource is reserved */
 388         for (i = 0; i < 16; i++) {
 389                 if (pnp_reserve_irq[i] == *irq)
 390                         return 0;
 391         }
 392
 393         /* check for internal conflicts */
 394         for (i = 0; i < PNP_MAX_IRQ && i != idx; i++) {
 395                 tres = &dev->res.irq_resource[i];
 396                 if (tres->flags & IORESOURCE_IRQ) {
 397                         if (tres->start == *irq)
 398                                 return 0;
 399                 }
 400         }
 401
 402 #ifdef CONFIG_PCI
 403         /* check if the resource is being used by a pci device */
 404         {
 405                 struct pci_dev *pci = NULL;
 406                 for_each_pci_dev(pci) {
 407                         if (pci->irq == *irq) {
 408                                 pci_dev_put(pci);
 409                                 return 0;
 410                         }
 411                 }
 412         }
 413 #endif
 414
 415         /* check if the resource is already in use, skip if the
 416          * device is active because it itself may be in use */
 417         if (!dev->active) {
 418                 if (request_irq(*irq, pnp_test_handler,
 419                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 420                         return 0;
 421                 free_irq(*irq, NULL);
 422         }
 423
 424         /* check for conflicts with other pnp devices */
 425         pnp_for_each_dev(tdev) {
 426                 if (tdev == dev)
 427                         continue;
 428                 for (i = 0; i < PNP_MAX_IRQ; i++) {
 429                         tres = &tdev->res.irq_resource[i];
 430                         if (tres->flags & IORESOURCE_IRQ) {
 431                                 if (cannot_compare(tres->flags))
 432                                         continue;
 433                                 if (tres->start == *irq)
 434                                         return 0;
 435                         }
 436                 }
 437         }
 438
 439         return 1;
 440 }
 441
 442 int pnp_check_dma(struct pnp_dev *dev, int idx)
 443 {
 444 #ifndef CONFIG_IA64
 445         int i;
 446         struct pnp_dev *tdev;
 447         struct resource *res, *tres;
 448         resource_size_t *dma;
 449
 450         res = &dev->res.dma_resource[idx];
 451         dma = &res->start;
 452
 453         /* if the resource doesn't exist, don't complain about it */
 454         if (cannot_compare(res->flags))
 455                 return 1;
 456
 457         /* check if the resource is valid */
 458         if (*dma < 0 || *dma == 4 || *dma > 7)
 459                 return 0;
 460
 461         /* check if the resource is reserved */
 462         for (i = 0; i < 8; i++) {
 463                 if (pnp_reserve_dma[i] == *dma)
 464                         return 0;
 465         }
 466
 467         /* check for internal conflicts */
 468         for (i = 0; i < PNP_MAX_DMA && i != idx; i++) {
 469                 tres = &dev->res.dma_resource[i];
 470                 if (tres->flags & IORESOURCE_DMA) {
 471                         if (tres->start == *dma)
 472                                 return 0;
 473                 }
 474         }
 475
 476         /* check if the resource is already in use, skip if the
 477          * device is active because it itself may be in use */
 478         if (!dev->active) {
 479                 if (request_dma(*dma, "pnp"))
 480                         return 0;
 481                 free_dma(*dma);
 482         }
 483
 484         /* check for conflicts with other pnp devices */
 485         pnp_for_each_dev(tdev) {
 486                 if (tdev == dev)
 487                         continue;
 488                 for (i = 0; i < PNP_MAX_DMA; i++) {
 489                         tres = &tdev->res.dma_resource[i];
 490                         if (tres->flags & IORESOURCE_DMA) {
 491                                 if (cannot_compare(tres->flags))
 492                                         continue;
 493                                 if (tres->start == *dma)
 494                                         return 0;
 495                         }
 496                 }
 497         }
 498
 499         return 1;
 500 #else
 501         /* IA64 does not have legacy DMA */
 502         return 0;
 503 #endif
 504 }
 505
 506 struct resource *pnp_get_resource(struct pnp_dev *dev,
 507                                   unsigned int type, unsigned int num)
 508 {
 509         struct pnp_resource_table *res = &dev->res;
 510
 511         switch (type) {
 512         case IORESOURCE_IO:
 513                 if (num >= PNP_MAX_PORT)
 514                         return NULL;
 515                 return &res->port_resource[num];
 516         case IORESOURCE_MEM:
 517                 if (num >= PNP_MAX_MEM)
 518                         return NULL;
 519                 return &res->mem_resource[num];
 520         case IORESOURCE_IRQ:
 521                 if (num >= PNP_MAX_IRQ)
 522                         return NULL;
 523                 return &res->irq_resource[num];
 524         case IORESOURCE_DMA:
 525                 if (num >= PNP_MAX_DMA)
 526                         return NULL;
 527                 return &res->dma_resource[num];
 528         }
 529         return NULL;
 530 }
 531 EXPORT_SYMBOL(pnp_get_resource);
 532
 533 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 534 static int __init pnp_setup_reserve_irq(char *str)
 535 {
 536         int i;
 537
 538         for (i = 0; i < 16; i++)
 539                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 540                         break;
 541         return 1;
 542 }
 543
 544 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 545
 546 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 547 static int __init pnp_setup_reserve_dma(char *str)
 548 {
 549         int i;
 550
 551         for (i = 0; i < 8; i++)
 552                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 553                         break;
 554         return 1;
 555 }
 556
 557 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 558
 559 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 560 static int __init pnp_setup_reserve_io(char *str)
 561 {
 562         int i;
 563
 564         for (i = 0; i < 16; i++)
 565                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 566                         break;
 567         return 1;
 568 }
 569
 570 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 571
 572 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 573 static int __init pnp_setup_reserve_mem(char *str)
 574 {
 575         int i;
 576
 577         for (i = 0; i < 16; i++)
 578                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 579                         break;
 580         return 1;
 581 }
 582
 583 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);