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@suse.cz>
   5  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
   6  *
   7  */
   8
   9 #include <linux/config.h>
  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 /*
  31  * option registration
  32  */
  33
  34 static struct pnp_option * pnp_build_option(int priority)
  35 {
  36         struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));
  37
  38         /* check if pnp_alloc ran out of memory */
  39         if (!option)
  40                 return NULL;
  41
  42         option->priority = priority & 0xff;
  43         /* make sure the priority is valid */
  44         if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
  45                 option->priority = PNP_RES_PRIORITY_INVALID;
  46
  47         return option;
  48 }
  49
  50 struct pnp_option * pnp_register_independent_option(struct pnp_dev *dev)
  51 {
  52         struct pnp_option *option;
  53         if (!dev)
  54                 return NULL;
  55
  56         option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);
  57
  58         /* this should never happen but if it does we'll try to continue */
  59         if (dev->independent)
  60                 pnp_err("independent resource already registered");
  61         dev->independent = option;
  62         return option;
  63 }
  64
  65 struct pnp_option * pnp_register_dependent_option(struct pnp_dev *dev, int priority)
  66 {
  67         struct pnp_option *option;
  68         if (!dev)
  69                 return NULL;
  70
  71         option = pnp_build_option(priority);
  72
  73         if (dev->dependent) {
  74                 struct pnp_option *parent = dev->dependent;
  75                 while (parent->next)
  76                         parent = parent->next;
  77                 parent->next = option;
  78         } else
  79                 dev->dependent = option;
  80         return option;
  81 }
  82
  83 int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data)
  84 {
  85         struct pnp_irq *ptr;
  86         if (!option)
  87                 return -EINVAL;
  88         if (!data)
  89                 return -EINVAL;
  90
  91         ptr = option->irq;
  92         while (ptr && ptr->next)
  93                 ptr = ptr->next;
  94         if (ptr)
  95                 ptr->next = data;
  96         else
  97                 option->irq = data;
  98
  99 #ifdef CONFIG_PCI
 100         {
 101                 int i;
 102
 103                 for (i = 0; i < 16; i++)
 104                         if (test_bit(i, data->map))
 105                                 pcibios_penalize_isa_irq(i);
 106         }
 107 #endif
 108         return 0;
 109 }
 110
 111 int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data)
 112 {
 113         struct pnp_dma *ptr;
 114         if (!option)
 115                 return -EINVAL;
 116         if (!data)
 117                 return -EINVAL;
 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         return 0;
 128 }
 129
 130 int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data)
 131 {
 132         struct pnp_port *ptr;
 133         if (!option)
 134                 return -EINVAL;
 135         if (!data)
 136                 return -EINVAL;
 137
 138         ptr = option->port;
 139         while (ptr && ptr->next)
 140                 ptr = ptr->next;
 141         if (ptr)
 142                 ptr->next = data;
 143         else
 144                 option->port = data;
 145
 146         return 0;
 147 }
 148
 149 int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data)
 150 {
 151         struct pnp_mem *ptr;
 152         if (!option)
 153                 return -EINVAL;
 154         if (!data)
 155                 return -EINVAL;
 156
 157         ptr = option->mem;
 158         while (ptr && ptr->next)
 159                 ptr = ptr->next;
 160         if (ptr)
 161                 ptr->next = data;
 162         else
 163                 option->mem = data;
 164         return 0;
 165 }
 166
 167 static void pnp_free_port(struct pnp_port *port)
 168 {
 169         struct pnp_port *next;
 170
 171         while (port) {
 172                 next = port->next;
 173                 kfree(port);
 174                 port = next;
 175         }
 176 }
 177
 178 static void pnp_free_irq(struct pnp_irq *irq)
 179 {
 180         struct pnp_irq *next;
 181
 182         while (irq) {
 183                 next = irq->next;
 184                 kfree(irq);
 185                 irq = next;
 186         }
 187 }
 188
 189 static void pnp_free_dma(struct pnp_dma *dma)
 190 {
 191         struct pnp_dma *next;
 192
 193         while (dma) {
 194                 next = dma->next;
 195                 kfree(dma);
 196                 dma = next;
 197         }
 198 }
 199
 200 static void pnp_free_mem(struct pnp_mem *mem)
 201 {
 202         struct pnp_mem *next;
 203
 204         while (mem) {
 205                 next = mem->next;
 206                 kfree(mem);
 207                 mem = next;
 208         }
 209 }
 210
 211 void pnp_free_option(struct pnp_option *option)
 212 {
 213         struct pnp_option *next;
 214
 215         while (option) {
 216                 next = option->next;
 217                 pnp_free_port(option->port);
 218                 pnp_free_irq(option->irq);
 219                 pnp_free_dma(option->dma);
 220                 pnp_free_mem(option->mem);
 221                 kfree(option);
 222                 option = next;
 223         }
 224 }
 225
 226
 227 /*
 228  * resource validity checking
 229  */
 230
 231 #define length(start, end) (*(end) - *(start) + 1)
 232
 233 /* Two ranges conflict if one doesn't end before the other starts */
 234 #define ranged_conflict(starta, enda, startb, endb) \
 235         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
 236
 237 #define cannot_compare(flags) \
 238 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
 239
 240 int pnp_check_port(struct pnp_dev * dev, int idx)
 241 {
 242         int tmp;
 243         struct pnp_dev *tdev;
 244         unsigned long *port, *end, *tport, *tend;
 245         port = &dev->res.port_resource[idx].start;
 246         end = &dev->res.port_resource[idx].end;
 247
 248         /* if the resource doesn't exist, don't complain about it */
 249         if (cannot_compare(dev->res.port_resource[idx].flags))
 250                 return 1;
 251
 252         /* check if the resource is already in use, skip if the
 253          * device is active because it itself may be in use */
 254         if(!dev->active) {
 255                 if (__check_region(&ioport_resource, *port, length(port,end)))
 256                         return 0;
 257         }
 258
 259         /* check if the resource is reserved */
 260         for (tmp = 0; tmp < 8; tmp++) {
 261                 int rport = pnp_reserve_io[tmp << 1];
 262                 int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1;
 263                 if (ranged_conflict(port,end,&rport,&rend))
 264                         return 0;
 265         }
 266
 267         /* check for internal conflicts */
 268         for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) {
 269                 if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) {
 270                         tport = &dev->res.port_resource[tmp].start;
 271                         tend = &dev->res.port_resource[tmp].end;
 272                         if (ranged_conflict(port,end,tport,tend))
 273                                 return 0;
 274                 }
 275         }
 276
 277         /* check for conflicts with other pnp devices */
 278         pnp_for_each_dev(tdev) {
 279                 if (tdev == dev)
 280                         continue;
 281                 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
 282                         if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) {
 283                                 if (cannot_compare(tdev->res.port_resource[tmp].flags))
 284                                         continue;
 285                                 tport = &tdev->res.port_resource[tmp].start;
 286                                 tend = &tdev->res.port_resource[tmp].end;
 287                                 if (ranged_conflict(port,end,tport,tend))
 288                                         return 0;
 289                         }
 290                 }
 291         }
 292
 293         return 1;
 294 }
 295
 296 int pnp_check_mem(struct pnp_dev * dev, int idx)
 297 {
 298         int tmp;
 299         struct pnp_dev *tdev;
 300         unsigned long *addr, *end, *taddr, *tend;
 301         addr = &dev->res.mem_resource[idx].start;
 302         end = &dev->res.mem_resource[idx].end;
 303
 304         /* if the resource doesn't exist, don't complain about it */
 305         if (cannot_compare(dev->res.mem_resource[idx].flags))
 306                 return 1;
 307
 308         /* check if the resource is already in use, skip if the
 309          * device is active because it itself may be in use */
 310         if(!dev->active) {
 311                 if (check_mem_region(*addr, length(addr,end)))
 312                         return 0;
 313         }
 314
 315         /* check if the resource is reserved */
 316         for (tmp = 0; tmp < 8; tmp++) {
 317                 int raddr = pnp_reserve_mem[tmp << 1];
 318                 int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1;
 319                 if (ranged_conflict(addr,end,&raddr,&rend))
 320                         return 0;
 321         }
 322
 323         /* check for internal conflicts */
 324         for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) {
 325                 if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
 326                         taddr = &dev->res.mem_resource[tmp].start;
 327                         tend = &dev->res.mem_resource[tmp].end;
 328                         if (ranged_conflict(addr,end,taddr,tend))
 329                                 return 0;
 330                 }
 331         }
 332
 333         /* check for conflicts with other pnp devices */
 334         pnp_for_each_dev(tdev) {
 335                 if (tdev == dev)
 336                         continue;
 337                 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
 338                         if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
 339                                 if (cannot_compare(tdev->res.mem_resource[tmp].flags))
 340                                         continue;
 341                                 taddr = &tdev->res.mem_resource[tmp].start;
 342                                 tend = &tdev->res.mem_resource[tmp].end;
 343                                 if (ranged_conflict(addr,end,taddr,tend))
 344                                         return 0;
 345                         }
 346                 }
 347         }
 348
 349         return 1;
 350 }
 351
 352 static irqreturn_t pnp_test_handler(int irq, void *dev_id, struct pt_regs *regs)
 353 {
 354         return IRQ_HANDLED;
 355 }
 356
 357 int pnp_check_irq(struct pnp_dev * dev, int idx)
 358 {
 359         int tmp;
 360         struct pnp_dev *tdev;
 361         unsigned long * irq = &dev->res.irq_resource[idx].start;
 362
 363         /* if the resource doesn't exist, don't complain about it */
 364         if (cannot_compare(dev->res.irq_resource[idx].flags))
 365                 return 1;
 366
 367         /* check if the resource is valid */
 368         if (*irq < 0 || *irq > 15)
 369                 return 0;
 370
 371         /* check if the resource is reserved */
 372         for (tmp = 0; tmp < 16; tmp++) {
 373                 if (pnp_reserve_irq[tmp] == *irq)
 374                         return 0;
 375         }
 376
 377         /* check for internal conflicts */
 378         for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) {
 379                 if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
 380                         if (dev->res.irq_resource[tmp].start == *irq)
 381                                 return 0;
 382                 }
 383         }
 384
 385 #ifdef CONFIG_PCI
 386         /* check if the resource is being used by a pci device */
 387         {
 388                 struct pci_dev *pci = NULL;
 389                 for_each_pci_dev(pci) {
 390                         if (pci->irq == *irq)
 391                                 return 0;
 392                 }
 393         }
 394 #endif
 395
 396         /* check if the resource is already in use, skip if the
 397          * device is active because it itself may be in use */
 398         if(!dev->active) {
 399                 if (request_irq(*irq, pnp_test_handler, SA_INTERRUPT, "pnp", NULL))
 400                         return 0;
 401                 free_irq(*irq, NULL);
 402         }
 403
 404         /* check for conflicts with other pnp devices */
 405         pnp_for_each_dev(tdev) {
 406                 if (tdev == dev)
 407                         continue;
 408                 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
 409                         if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
 410                                 if (cannot_compare(tdev->res.irq_resource[tmp].flags))
 411                                         continue;
 412                                 if ((tdev->res.irq_resource[tmp].start == *irq))
 413                                         return 0;
 414                         }
 415                 }
 416         }
 417
 418         return 1;
 419 }
 420
 421 int pnp_check_dma(struct pnp_dev * dev, int idx)
 422 {
 423 #ifndef CONFIG_IA64
 424         int tmp;
 425         struct pnp_dev *tdev;
 426         unsigned long * dma = &dev->res.dma_resource[idx].start;
 427
 428         /* if the resource doesn't exist, don't complain about it */
 429         if (cannot_compare(dev->res.dma_resource[idx].flags))
 430                 return 1;
 431
 432         /* check if the resource is valid */
 433         if (*dma < 0 || *dma == 4 || *dma > 7)
 434                 return 0;
 435
 436         /* check if the resource is reserved */
 437         for (tmp = 0; tmp < 8; tmp++) {
 438                 if (pnp_reserve_dma[tmp] == *dma)
 439                         return 0;
 440         }
 441
 442         /* check for internal conflicts */
 443         for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) {
 444                 if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
 445                         if (dev->res.dma_resource[tmp].start == *dma)
 446                                 return 0;
 447                 }
 448         }
 449
 450         /* check if the resource is already in use, skip if the
 451          * device is active because it itself may be in use */
 452         if(!dev->active) {
 453                 if (request_dma(*dma, "pnp"))
 454                         return 0;
 455                 free_dma(*dma);
 456         }
 457
 458         /* check for conflicts with other pnp devices */
 459         pnp_for_each_dev(tdev) {
 460                 if (tdev == dev)
 461                         continue;
 462                 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
 463                         if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
 464                                 if (cannot_compare(tdev->res.dma_resource[tmp].flags))
 465                                         continue;
 466                                 if ((tdev->res.dma_resource[tmp].start == *dma))
 467                                         return 0;
 468                         }
 469                 }
 470         }
 471
 472         return 1;
 473 #else
 474         /* IA64 hasn't legacy DMA */
 475         return 0;
 476 #endif
 477 }
 478
 479
 480 EXPORT_SYMBOL(pnp_register_dependent_option);
 481 EXPORT_SYMBOL(pnp_register_independent_option);
 482 EXPORT_SYMBOL(pnp_register_irq_resource);
 483 EXPORT_SYMBOL(pnp_register_dma_resource);
 484 EXPORT_SYMBOL(pnp_register_port_resource);
 485 EXPORT_SYMBOL(pnp_register_mem_resource);
 486
 487
 488 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 489
 490 static int __init pnp_setup_reserve_irq(char *str)
 491 {
 492         int i;
 493
 494         for (i = 0; i < 16; i++)
 495                 if (get_option(&str,&pnp_reserve_irq[i]) != 2)
 496                         break;
 497         return 1;
 498 }
 499
 500 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 501
 502 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 503
 504 static int __init pnp_setup_reserve_dma(char *str)
 505 {
 506         int i;
 507
 508         for (i = 0; i < 8; i++)
 509                 if (get_option(&str,&pnp_reserve_dma[i]) != 2)
 510                         break;
 511         return 1;
 512 }
 513
 514 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 515
 516 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 517
 518 static int __init pnp_setup_reserve_io(char *str)
 519 {
 520         int i;
 521
 522         for (i = 0; i < 16; i++)
 523                 if (get_option(&str,&pnp_reserve_io[i]) != 2)
 524                         break;
 525         return 1;
 526 }
 527
 528 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 529
 530 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 531
 532 static int __init pnp_setup_reserve_mem(char *str)
 533 {
 534         int i;
 535
 536         for (i = 0; i < 16; i++)
 537                 if (get_option(&str,&pnp_reserve_mem[i]) != 2)
 538                         break;
 539         return 1;
 540 }
 541
 542 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);