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         return option;
  57 }
  58
  59 struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev,
  60                                                  int priority)
  61 {
  62         struct pnp_option *option;
  63
  64         option = pnp_build_option(priority);
  65
  66         if (dev->dependent) {
  67                 struct pnp_option *parent = dev->dependent;
  68                 while (parent->next)
  69                         parent = parent->next;
  70                 parent->next = option;
  71         } else
  72                 dev->dependent = option;
  73         return option;
  74 }
  75
  76 int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data)
  77 {
  78         struct pnp_irq *ptr;
  79
  80         ptr = option->irq;
  81         while (ptr && ptr->next)
  82                 ptr = ptr->next;
  83         if (ptr)
  84                 ptr->next = data;
  85         else
  86                 option->irq = data;
  87
  88 #ifdef CONFIG_PCI
  89         {
  90                 int i;
  91
  92                 for (i = 0; i < 16; i++)
  93                         if (test_bit(i, data->map))
  94                                 pcibios_penalize_isa_irq(i, 0);
  95         }
  96 #endif
  97         return 0;
  98 }
  99
 100 int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data)
 101 {
 102         struct pnp_dma *ptr;
 103
 104         ptr = option->dma;
 105         while (ptr && ptr->next)
 106                 ptr = ptr->next;
 107         if (ptr)
 108                 ptr->next = data;
 109         else
 110                 option->dma = data;
 111
 112         return 0;
 113 }
 114
 115 int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data)
 116 {
 117         struct pnp_port *ptr;
 118
 119         ptr = option->port;
 120         while (ptr && ptr->next)
 121                 ptr = ptr->next;
 122         if (ptr)
 123                 ptr->next = data;
 124         else
 125                 option->port = data;
 126
 127         return 0;
 128 }
 129
 130 int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data)
 131 {
 132         struct pnp_mem *ptr;
 133
 134         ptr = option->mem;
 135         while (ptr && ptr->next)
 136                 ptr = ptr->next;
 137         if (ptr)
 138                 ptr->next = data;
 139         else
 140                 option->mem = data;
 141         return 0;
 142 }
 143
 144 static void pnp_free_port(struct pnp_port *port)
 145 {
 146         struct pnp_port *next;
 147
 148         while (port) {
 149                 next = port->next;
 150                 kfree(port);
 151                 port = next;
 152         }
 153 }
 154
 155 static void pnp_free_irq(struct pnp_irq *irq)
 156 {
 157         struct pnp_irq *next;
 158
 159         while (irq) {
 160                 next = irq->next;
 161                 kfree(irq);
 162                 irq = next;
 163         }
 164 }
 165
 166 static void pnp_free_dma(struct pnp_dma *dma)
 167 {
 168         struct pnp_dma *next;
 169
 170         while (dma) {
 171                 next = dma->next;
 172                 kfree(dma);
 173                 dma = next;
 174         }
 175 }
 176
 177 static void pnp_free_mem(struct pnp_mem *mem)
 178 {
 179         struct pnp_mem *next;
 180
 181         while (mem) {
 182                 next = mem->next;
 183                 kfree(mem);
 184                 mem = next;
 185         }
 186 }
 187
 188 void pnp_free_option(struct pnp_option *option)
 189 {
 190         struct pnp_option *next;
 191
 192         while (option) {
 193                 next = option->next;
 194                 pnp_free_port(option->port);
 195                 pnp_free_irq(option->irq);
 196                 pnp_free_dma(option->dma);
 197                 pnp_free_mem(option->mem);
 198                 kfree(option);
 199                 option = next;
 200         }
 201 }
 202
 203 /*
 204  * resource validity checking
 205  */
 206
 207 #define length(start, end) (*(end) - *(start) + 1)
 208
 209 /* Two ranges conflict if one doesn't end before the other starts */
 210 #define ranged_conflict(starta, enda, startb, endb) \
 211         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
 212
 213 #define cannot_compare(flags) \
 214 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
 215
 216 int pnp_check_port(struct pnp_dev *dev, int idx)
 217 {
 218         int tmp;
 219         struct pnp_dev *tdev;
 220         resource_size_t *port, *end, *tport, *tend;
 221
 222         port = &dev->res.port_resource[idx].start;
 223         end = &dev->res.port_resource[idx].end;
 224
 225         /* if the resource doesn't exist, don't complain about it */
 226         if (cannot_compare(dev->res.port_resource[idx].flags))
 227                 return 1;
 228
 229         /* check if the resource is already in use, skip if the
 230          * device is active because it itself may be in use */
 231         if (!dev->active) {
 232                 if (__check_region(&ioport_resource, *port, length(port, end)))
 233                         return 0;
 234         }
 235
 236         /* check if the resource is reserved */
 237         for (tmp = 0; tmp < 8; tmp++) {
 238                 int rport = pnp_reserve_io[tmp << 1];
 239                 int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1;
 240                 if (ranged_conflict(port, end, &rport, &rend))
 241                         return 0;
 242         }
 243
 244         /* check for internal conflicts */
 245         for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) {
 246                 if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) {
 247                         tport = &dev->res.port_resource[tmp].start;
 248                         tend = &dev->res.port_resource[tmp].end;
 249                         if (ranged_conflict(port, end, tport, tend))
 250                                 return 0;
 251                 }
 252         }
 253
 254         /* check for conflicts with other pnp devices */
 255         pnp_for_each_dev(tdev) {
 256                 if (tdev == dev)
 257                         continue;
 258                 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
 259                         if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) {
 260                                 if (cannot_compare
 261                                     (tdev->res.port_resource[tmp].flags))
 262                                         continue;
 263                                 tport = &tdev->res.port_resource[tmp].start;
 264                                 tend = &tdev->res.port_resource[tmp].end;
 265                                 if (ranged_conflict(port, end, tport, tend))
 266                                         return 0;
 267                         }
 268                 }
 269         }
 270
 271         return 1;
 272 }
 273
 274 int pnp_check_mem(struct pnp_dev *dev, int idx)
 275 {
 276         int tmp;
 277         struct pnp_dev *tdev;
 278         resource_size_t *addr, *end, *taddr, *tend;
 279
 280         addr = &dev->res.mem_resource[idx].start;
 281         end = &dev->res.mem_resource[idx].end;
 282
 283         /* if the resource doesn't exist, don't complain about it */
 284         if (cannot_compare(dev->res.mem_resource[idx].flags))
 285                 return 1;
 286
 287         /* check if the resource is already in use, skip if the
 288          * device is active because it itself may be in use */
 289         if (!dev->active) {
 290                 if (check_mem_region(*addr, length(addr, end)))
 291                         return 0;
 292         }
 293
 294         /* check if the resource is reserved */
 295         for (tmp = 0; tmp < 8; tmp++) {
 296                 int raddr = pnp_reserve_mem[tmp << 1];
 297                 int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1;
 298                 if (ranged_conflict(addr, end, &raddr, &rend))
 299                         return 0;
 300         }
 301
 302         /* check for internal conflicts */
 303         for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) {
 304                 if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
 305                         taddr = &dev->res.mem_resource[tmp].start;
 306                         tend = &dev->res.mem_resource[tmp].end;
 307                         if (ranged_conflict(addr, end, taddr, tend))
 308                                 return 0;
 309                 }
 310         }
 311
 312         /* check for conflicts with other pnp devices */
 313         pnp_for_each_dev(tdev) {
 314                 if (tdev == dev)
 315                         continue;
 316                 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
 317                         if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
 318                                 if (cannot_compare
 319                                     (tdev->res.mem_resource[tmp].flags))
 320                                         continue;
 321                                 taddr = &tdev->res.mem_resource[tmp].start;
 322                                 tend = &tdev->res.mem_resource[tmp].end;
 323                                 if (ranged_conflict(addr, end, taddr, tend))
 324                                         return 0;
 325                         }
 326                 }
 327         }
 328
 329         return 1;
 330 }
 331
 332 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 333 {
 334         return IRQ_HANDLED;
 335 }
 336
 337 int pnp_check_irq(struct pnp_dev *dev, int idx)
 338 {
 339         int tmp;
 340         struct pnp_dev *tdev;
 341         resource_size_t *irq = &dev->res.irq_resource[idx].start;
 342
 343         /* if the resource doesn't exist, don't complain about it */
 344         if (cannot_compare(dev->res.irq_resource[idx].flags))
 345                 return 1;
 346
 347         /* check if the resource is valid */
 348         if (*irq < 0 || *irq > 15)
 349                 return 0;
 350
 351         /* check if the resource is reserved */
 352         for (tmp = 0; tmp < 16; tmp++) {
 353                 if (pnp_reserve_irq[tmp] == *irq)
 354                         return 0;
 355         }
 356
 357         /* check for internal conflicts */
 358         for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) {
 359                 if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
 360                         if (dev->res.irq_resource[tmp].start == *irq)
 361                                 return 0;
 362                 }
 363         }
 364
 365 #ifdef CONFIG_PCI
 366         /* check if the resource is being used by a pci device */
 367         {
 368                 struct pci_dev *pci = NULL;
 369                 for_each_pci_dev(pci) {
 370                         if (pci->irq == *irq)
 371                                 return 0;
 372                 }
 373         }
 374 #endif
 375
 376         /* check if the resource is already in use, skip if the
 377          * device is active because it itself may be in use */
 378         if (!dev->active) {
 379                 if (request_irq(*irq, pnp_test_handler,
 380                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 381                         return 0;
 382                 free_irq(*irq, NULL);
 383         }
 384
 385         /* check for conflicts with other pnp devices */
 386         pnp_for_each_dev(tdev) {
 387                 if (tdev == dev)
 388                         continue;
 389                 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
 390                         if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
 391                                 if (cannot_compare
 392                                     (tdev->res.irq_resource[tmp].flags))
 393                                         continue;
 394                                 if ((tdev->res.irq_resource[tmp].start == *irq))
 395                                         return 0;
 396                         }
 397                 }
 398         }
 399
 400         return 1;
 401 }
 402
 403 int pnp_check_dma(struct pnp_dev *dev, int idx)
 404 {
 405 #ifndef CONFIG_IA64
 406         int tmp;
 407         struct pnp_dev *tdev;
 408         resource_size_t *dma = &dev->res.dma_resource[idx].start;
 409
 410         /* if the resource doesn't exist, don't complain about it */
 411         if (cannot_compare(dev->res.dma_resource[idx].flags))
 412                 return 1;
 413
 414         /* check if the resource is valid */
 415         if (*dma < 0 || *dma == 4 || *dma > 7)
 416                 return 0;
 417
 418         /* check if the resource is reserved */
 419         for (tmp = 0; tmp < 8; tmp++) {
 420                 if (pnp_reserve_dma[tmp] == *dma)
 421                         return 0;
 422         }
 423
 424         /* check for internal conflicts */
 425         for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) {
 426                 if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
 427                         if (dev->res.dma_resource[tmp].start == *dma)
 428                                 return 0;
 429                 }
 430         }
 431
 432         /* check if the resource is already in use, skip if the
 433          * device is active because it itself may be in use */
 434         if (!dev->active) {
 435                 if (request_dma(*dma, "pnp"))
 436                         return 0;
 437                 free_dma(*dma);
 438         }
 439
 440         /* check for conflicts with other pnp devices */
 441         pnp_for_each_dev(tdev) {
 442                 if (tdev == dev)
 443                         continue;
 444                 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
 445                         if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
 446                                 if (cannot_compare
 447                                     (tdev->res.dma_resource[tmp].flags))
 448                                         continue;
 449                                 if ((tdev->res.dma_resource[tmp].start == *dma))
 450                                         return 0;
 451                         }
 452                 }
 453         }
 454
 455         return 1;
 456 #else
 457         /* IA64 does not have legacy DMA */
 458         return 0;
 459 #endif
 460 }
 461
 462 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 463 static int __init pnp_setup_reserve_irq(char *str)
 464 {
 465         int i;
 466
 467         for (i = 0; i < 16; i++)
 468                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 469                         break;
 470         return 1;
 471 }
 472
 473 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 474
 475 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 476 static int __init pnp_setup_reserve_dma(char *str)
 477 {
 478         int i;
 479
 480         for (i = 0; i < 8; i++)
 481                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 482                         break;
 483         return 1;
 484 }
 485
 486 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 487
 488 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 489 static int __init pnp_setup_reserve_io(char *str)
 490 {
 491         int i;
 492
 493         for (i = 0; i < 16; i++)
 494                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 495                         break;
 496         return 1;
 497 }
 498
 499 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 500
 501 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 502 static int __init pnp_setup_reserve_mem(char *str)
 503 {
 504         int i;
 505
 506         for (i = 0; i < 16; i++)
 507                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 508                         break;
 509         return 1;
 510 }
 511
 512 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);