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, struct resource *res)
 243 {
 244         int i;
 245         struct pnp_dev *tdev;
 246         struct resource *tres;
 247         resource_size_t *port, *end, *tport, *tend;
 248
 249         port = &res->start;
 250         end = &res->end;
 251
 252         /* if the resource doesn't exist, don't complain about it */
 253         if (cannot_compare(res->flags))
 254                 return 1;
 255
 256         /* check if the resource is already in use, skip if the
 257          * device is active because it itself may be in use */
 258         if (!dev->active) {
 259                 if (__check_region(&ioport_resource, *port, length(port, end)))
 260                         return 0;
 261         }
 262
 263         /* check if the resource is reserved */
 264         for (i = 0; i < 8; i++) {
 265                 int rport = pnp_reserve_io[i << 1];
 266                 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
 267                 if (ranged_conflict(port, end, &rport, &rend))
 268                         return 0;
 269         }
 270
 271         /* check for internal conflicts */
 272         for (i = 0; i < PNP_MAX_PORT; i++) {
 273                 tres = pnp_get_resource(dev, IORESOURCE_IO, i);
 274                 if (tres && tres != res && tres->flags & IORESOURCE_IO) {
 275                         tport = &tres->start;
 276                         tend = &tres->end;
 277                         if (ranged_conflict(port, end, tport, tend))
 278                                 return 0;
 279                 }
 280         }
 281
 282         /* check for conflicts with other pnp devices */
 283         pnp_for_each_dev(tdev) {
 284                 if (tdev == dev)
 285                         continue;
 286                 for (i = 0; i < PNP_MAX_PORT; i++) {
 287                         tres = pnp_get_resource(tdev, IORESOURCE_IO, i);
 288                         if (tres && tres->flags & IORESOURCE_IO) {
 289                                 if (cannot_compare(tres->flags))
 290                                         continue;
 291                                 tport = &tres->start;
 292                                 tend = &tres->end;
 293                                 if (ranged_conflict(port, end, tport, tend))
 294                                         return 0;
 295                         }
 296                 }
 297         }
 298
 299         return 1;
 300 }
 301
 302 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
 303 {
 304         int i;
 305         struct pnp_dev *tdev;
 306         struct resource *tres;
 307         resource_size_t *addr, *end, *taddr, *tend;
 308
 309         addr = &res->start;
 310         end = &res->end;
 311
 312         /* if the resource doesn't exist, don't complain about it */
 313         if (cannot_compare(res->flags))
 314                 return 1;
 315
 316         /* check if the resource is already in use, skip if the
 317          * device is active because it itself may be in use */
 318         if (!dev->active) {
 319                 if (check_mem_region(*addr, length(addr, end)))
 320                         return 0;
 321         }
 322
 323         /* check if the resource is reserved */
 324         for (i = 0; i < 8; i++) {
 325                 int raddr = pnp_reserve_mem[i << 1];
 326                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 327                 if (ranged_conflict(addr, end, &raddr, &rend))
 328                         return 0;
 329         }
 330
 331         /* check for internal conflicts */
 332         for (i = 0; i < PNP_MAX_MEM; i++) {
 333                 tres = pnp_get_resource(dev, IORESOURCE_MEM, i);
 334                 if (tres && tres != res && tres->flags & IORESOURCE_MEM) {
 335                         taddr = &tres->start;
 336                         tend = &tres->end;
 337                         if (ranged_conflict(addr, end, taddr, tend))
 338                                 return 0;
 339                 }
 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; i < PNP_MAX_MEM; i++) {
 347                         tres = pnp_get_resource(tdev, IORESOURCE_MEM, i);
 348                         if (tres && tres->flags & IORESOURCE_MEM) {
 349                                 if (cannot_compare(tres->flags))
 350                                         continue;
 351                                 taddr = &tres->start;
 352                                 tend = &tres->end;
 353                                 if (ranged_conflict(addr, end, taddr, tend))
 354                                         return 0;
 355                         }
 356                 }
 357         }
 358
 359         return 1;
 360 }
 361
 362 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 363 {
 364         return IRQ_HANDLED;
 365 }
 366
 367 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 368 {
 369         int i;
 370         struct pnp_dev *tdev;
 371         struct resource *tres;
 372         resource_size_t *irq;
 373
 374         irq = &res->start;
 375
 376         /* if the resource doesn't exist, don't complain about it */
 377         if (cannot_compare(res->flags))
 378                 return 1;
 379
 380         /* check if the resource is valid */
 381         if (*irq < 0 || *irq > 15)
 382                 return 0;
 383
 384         /* check if the resource is reserved */
 385         for (i = 0; i < 16; i++) {
 386                 if (pnp_reserve_irq[i] == *irq)
 387                         return 0;
 388         }
 389
 390         /* check for internal conflicts */
 391         for (i = 0; i < PNP_MAX_IRQ; i++) {
 392                 tres = pnp_get_resource(dev, IORESOURCE_IRQ, i);
 393                 if (tres && tres != res && tres->flags & IORESOURCE_IRQ) {
 394                         if (tres->start == *irq)
 395                                 return 0;
 396                 }
 397         }
 398
 399 #ifdef CONFIG_PCI
 400         /* check if the resource is being used by a pci device */
 401         {
 402                 struct pci_dev *pci = NULL;
 403                 for_each_pci_dev(pci) {
 404                         if (pci->irq == *irq) {
 405                                 pci_dev_put(pci);
 406                                 return 0;
 407                         }
 408                 }
 409         }
 410 #endif
 411
 412         /* check if the resource is already in use, skip if the
 413          * device is active because it itself may be in use */
 414         if (!dev->active) {
 415                 if (request_irq(*irq, pnp_test_handler,
 416                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 417                         return 0;
 418                 free_irq(*irq, NULL);
 419         }
 420
 421         /* check for conflicts with other pnp devices */
 422         pnp_for_each_dev(tdev) {
 423                 if (tdev == dev)
 424                         continue;
 425                 for (i = 0; i < PNP_MAX_IRQ; i++) {
 426                         tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i);
 427                         if (tres && tres->flags & IORESOURCE_IRQ) {
 428                                 if (cannot_compare(tres->flags))
 429                                         continue;
 430                                 if (tres->start == *irq)
 431                                         return 0;
 432                         }
 433                 }
 434         }
 435
 436         return 1;
 437 }
 438
 439 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 440 {
 441 #ifndef CONFIG_IA64
 442         int i;
 443         struct pnp_dev *tdev;
 444         struct resource *tres;
 445         resource_size_t *dma;
 446
 447         dma = &res->start;
 448
 449         /* if the resource doesn't exist, don't complain about it */
 450         if (cannot_compare(res->flags))
 451                 return 1;
 452
 453         /* check if the resource is valid */
 454         if (*dma < 0 || *dma == 4 || *dma > 7)
 455                 return 0;
 456
 457         /* check if the resource is reserved */
 458         for (i = 0; i < 8; i++) {
 459                 if (pnp_reserve_dma[i] == *dma)
 460                         return 0;
 461         }
 462
 463         /* check for internal conflicts */
 464         for (i = 0; i < PNP_MAX_DMA; i++) {
 465                 tres = pnp_get_resource(dev, IORESOURCE_DMA, i);
 466                 if (tres && tres != res && tres->flags & IORESOURCE_DMA) {
 467                         if (tres->start == *dma)
 468                                 return 0;
 469                 }
 470         }
 471
 472         /* check if the resource is already in use, skip if the
 473          * device is active because it itself may be in use */
 474         if (!dev->active) {
 475                 if (request_dma(*dma, "pnp"))
 476                         return 0;
 477                 free_dma(*dma);
 478         }
 479
 480         /* check for conflicts with other pnp devices */
 481         pnp_for_each_dev(tdev) {
 482                 if (tdev == dev)
 483                         continue;
 484                 for (i = 0; i < PNP_MAX_DMA; i++) {
 485                         tres = pnp_get_resource(tdev, IORESOURCE_DMA, i);
 486                         if (tres && tres->flags & IORESOURCE_DMA) {
 487                                 if (cannot_compare(tres->flags))
 488                                         continue;
 489                                 if (tres->start == *dma)
 490                                         return 0;
 491                         }
 492                 }
 493         }
 494
 495         return 1;
 496 #else
 497         /* IA64 does not have legacy DMA */
 498         return 0;
 499 #endif
 500 }
 501
 502 struct resource *pnp_get_resource(struct pnp_dev *dev,
 503                                   unsigned int type, unsigned int num)
 504 {
 505         struct pnp_resource_table *res = &dev->res;
 506
 507         switch (type) {
 508         case IORESOURCE_IO:
 509                 if (num >= PNP_MAX_PORT)
 510                         return NULL;
 511                 return &res->port_resource[num];
 512         case IORESOURCE_MEM:
 513                 if (num >= PNP_MAX_MEM)
 514                         return NULL;
 515                 return &res->mem_resource[num];
 516         case IORESOURCE_IRQ:
 517                 if (num >= PNP_MAX_IRQ)
 518                         return NULL;
 519                 return &res->irq_resource[num];
 520         case IORESOURCE_DMA:
 521                 if (num >= PNP_MAX_DMA)
 522                         return NULL;
 523                 return &res->dma_resource[num];
 524         }
 525         return NULL;
 526 }
 527 EXPORT_SYMBOL(pnp_get_resource);
 528
 529 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 530 static int __init pnp_setup_reserve_irq(char *str)
 531 {
 532         int i;
 533
 534         for (i = 0; i < 16; i++)
 535                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 536                         break;
 537         return 1;
 538 }
 539
 540 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 541
 542 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 543 static int __init pnp_setup_reserve_dma(char *str)
 544 {
 545         int i;
 546
 547         for (i = 0; i < 8; i++)
 548                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 549                         break;
 550         return 1;
 551 }
 552
 553 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 554
 555 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 556 static int __init pnp_setup_reserve_io(char *str)
 557 {
 558         int i;
 559
 560         for (i = 0; i < 16; i++)
 561                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 562                         break;
 563         return 1;
 564 }
 565
 566 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 567
 568 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 569 static int __init pnp_setup_reserve_mem(char *str)
 570 {
 571         int i;
 572
 573         for (i = 0; i < 16; i++)
 574                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 575                         break;
 576         return 1;
 577 }
 578
 579 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);