SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/pnp/manager.c

   1 /*
   2  * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
   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/errno.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/pnp.h>
  13 #include <linux/slab.h>
  14 #include <linux/bitmap.h>
  15 #include <linux/mutex.h>
  16 #include "base.h"
  17
  18 DEFINE_MUTEX(pnp_res_mutex);
  19
  20 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
  21 {
  22         resource_size_t *start, *end;
  23         unsigned long *flags;
  24
  25         if (idx >= PNP_MAX_PORT) {
  26                 dev_err(&dev->dev, "too many I/O port resources\n");
  27                 /* pretend we were successful so at least the manager won't try again */
  28                 return 1;
  29         }
  30
  31         start = &dev->res.port_resource[idx].start;
  32         end = &dev->res.port_resource[idx].end;
  33         flags = &dev->res.port_resource[idx].flags;
  34
  35         /* check if this resource has been manually set, if so skip */
  36         if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO)) {
  37                 dev_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
  38                         "flags %#lx\n", idx, (unsigned long long) *start,
  39                         (unsigned long long) *end, *flags);
  40                 return 1;
  41         }
  42
  43         /* set the initial values */
  44         *flags |= rule->flags | IORESOURCE_IO;
  45         *flags &= ~IORESOURCE_UNSET;
  46
  47         if (!rule->size) {
  48                 *flags |= IORESOURCE_DISABLED;
  49                 dev_dbg(&dev->dev, "  io %d disabled\n", idx);
  50                 return 1;       /* skip disabled resource requests */
  51         }
  52
  53         *start = rule->min;
  54         *end = *start + rule->size - 1;
  55
  56         /* run through until pnp_check_port is happy */
  57         while (!pnp_check_port(dev, idx)) {
  58                 *start += rule->align;
  59                 *end = *start + rule->size - 1;
  60                 if (*start > rule->max || !rule->align) {
  61                         dev_dbg(&dev->dev, "  couldn't assign io %d\n", idx);
  62                         return 0;
  63                 }
  64         }
  65         dev_dbg(&dev->dev, "  assign io  %d %#llx-%#llx\n", idx,
  66                 (unsigned long long) *start, (unsigned long long) *end);
  67         return 1;
  68 }
  69
  70 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
  71 {
  72         resource_size_t *start, *end;
  73         unsigned long *flags;
  74
  75         if (idx >= PNP_MAX_MEM) {
  76                 dev_err(&dev->dev, "too many memory resources\n");
  77                 /* pretend we were successful so at least the manager won't try again */
  78                 return 1;
  79         }
  80
  81         start = &dev->res.mem_resource[idx].start;
  82         end = &dev->res.mem_resource[idx].end;
  83         flags = &dev->res.mem_resource[idx].flags;
  84
  85         /* check if this resource has been manually set, if so skip */
  86         if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO)) {
  87                 dev_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
  88                         "flags %#lx\n", idx, (unsigned long long) *start,
  89                         (unsigned long long) *end, *flags);
  90                 return 1;
  91         }
  92
  93         /* set the initial values */
  94         *flags |= rule->flags | IORESOURCE_MEM;
  95         *flags &= ~IORESOURCE_UNSET;
  96
  97         /* convert pnp flags to standard Linux flags */
  98         if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
  99                 *flags |= IORESOURCE_READONLY;
 100         if (rule->flags & IORESOURCE_MEM_CACHEABLE)
 101                 *flags |= IORESOURCE_CACHEABLE;
 102         if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
 103                 *flags |= IORESOURCE_RANGELENGTH;
 104         if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
 105                 *flags |= IORESOURCE_SHADOWABLE;
 106
 107         if (!rule->size) {
 108                 *flags |= IORESOURCE_DISABLED;
 109                 dev_dbg(&dev->dev, "  mem %d disabled\n", idx);
 110                 return 1;       /* skip disabled resource requests */
 111         }
 112
 113         *start = rule->min;
 114         *end = *start + rule->size - 1;
 115
 116         /* run through until pnp_check_mem is happy */
 117         while (!pnp_check_mem(dev, idx)) {
 118                 *start += rule->align;
 119                 *end = *start + rule->size - 1;
 120                 if (*start > rule->max || !rule->align) {
 121                         dev_dbg(&dev->dev, "  couldn't assign mem %d\n", idx);
 122                         return 0;
 123                 }
 124         }
 125         dev_dbg(&dev->dev, "  assign mem %d %#llx-%#llx\n", idx,
 126                 (unsigned long long) *start, (unsigned long long) *end);
 127         return 1;
 128 }
 129
 130 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
 131 {
 132         resource_size_t *start, *end;
 133         unsigned long *flags;
 134         int i;
 135
 136         /* IRQ priority: this table is good for i386 */
 137         static unsigned short xtab[16] = {
 138                 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
 139         };
 140
 141         if (idx >= PNP_MAX_IRQ) {
 142                 dev_err(&dev->dev, "too many IRQ resources\n");
 143                 /* pretend we were successful so at least the manager won't try again */
 144                 return 1;
 145         }
 146
 147         start = &dev->res.irq_resource[idx].start;
 148         end = &dev->res.irq_resource[idx].end;
 149         flags = &dev->res.irq_resource[idx].flags;
 150
 151         /* check if this resource has been manually set, if so skip */
 152         if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO)) {
 153                 dev_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
 154                         idx, (int) *start, *flags);
 155                 return 1;
 156         }
 157
 158         /* set the initial values */
 159         *flags |= rule->flags | IORESOURCE_IRQ;
 160         *flags &= ~IORESOURCE_UNSET;
 161
 162         if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
 163                 *flags |= IORESOURCE_DISABLED;
 164                 dev_dbg(&dev->dev, "  irq %d disabled\n", idx);
 165                 return 1;       /* skip disabled resource requests */
 166         }
 167
 168         /* TBD: need check for >16 IRQ */
 169         *start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
 170         if (*start < PNP_IRQ_NR) {
 171                 *end = *start;
 172                 dev_dbg(&dev->dev, "  assign irq %d %d\n", idx, (int) *start);
 173                 return 1;
 174         }
 175         for (i = 0; i < 16; i++) {
 176                 if (test_bit(xtab[i], rule->map)) {
 177                         *start = *end = xtab[i];
 178                         if (pnp_check_irq(dev, idx)) {
 179                                 dev_dbg(&dev->dev, "  assign irq %d %d\n", idx,
 180                                         (int) *start);
 181                                 return 1;
 182                         }
 183                 }
 184         }
 185         dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
 186         return 0;
 187 }
 188
 189 static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
 190 {
 191         resource_size_t *start, *end;
 192         unsigned long *flags;
 193         int i;
 194
 195         /* DMA priority: this table is good for i386 */
 196         static unsigned short xtab[8] = {
 197                 1, 3, 5, 6, 7, 0, 2, 4
 198         };
 199
 200         if (idx >= PNP_MAX_DMA) {
 201                 dev_err(&dev->dev, "too many DMA resources\n");
 202                 return;
 203         }
 204
 205         start = &dev->res.dma_resource[idx].start;
 206         end = &dev->res.dma_resource[idx].end;
 207         flags = &dev->res.dma_resource[idx].flags;
 208
 209         /* check if this resource has been manually set, if so skip */
 210         if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO)) {
 211                 dev_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
 212                         idx, (int) *start, *flags);
 213                 return;
 214         }
 215
 216         /* set the initial values */
 217         *flags |= rule->flags | IORESOURCE_DMA;
 218         *flags &= ~IORESOURCE_UNSET;
 219
 220         for (i = 0; i < 8; i++) {
 221                 if (rule->map & (1 << xtab[i])) {
 222                         *start = *end = xtab[i];
 223                         if (pnp_check_dma(dev, idx)) {
 224                                 dev_dbg(&dev->dev, "  assign dma %d %d\n", idx,
 225                                         (int) *start);
 226                                 return;
 227                         }
 228                 }
 229         }
 230 #ifdef MAX_DMA_CHANNELS
 231         *start = *end = MAX_DMA_CHANNELS;
 232 #endif
 233         *flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
 234         dev_dbg(&dev->dev, "  disable dma %d\n", idx);
 235 }
 236
 237 /**
 238  * pnp_init_resources - Resets a resource table to default values.
 239  * @table: pointer to the desired resource table
 240  */
 241 void pnp_init_resource_table(struct pnp_resource_table *table)
 242 {
 243         int idx;
 244
 245         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
 246                 table->irq_resource[idx].name = NULL;
 247                 table->irq_resource[idx].start = -1;
 248                 table->irq_resource[idx].end = -1;
 249                 table->irq_resource[idx].flags =
 250                     IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
 251         }
 252         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
 253                 table->dma_resource[idx].name = NULL;
 254                 table->dma_resource[idx].start = -1;
 255                 table->dma_resource[idx].end = -1;
 256                 table->dma_resource[idx].flags =
 257                     IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
 258         }
 259         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
 260                 table->port_resource[idx].name = NULL;
 261                 table->port_resource[idx].start = 0;
 262                 table->port_resource[idx].end = 0;
 263                 table->port_resource[idx].flags =
 264                     IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
 265         }
 266         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
 267                 table->mem_resource[idx].name = NULL;
 268                 table->mem_resource[idx].start = 0;
 269                 table->mem_resource[idx].end = 0;
 270                 table->mem_resource[idx].flags =
 271                     IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
 272         }
 273 }
 274
 275 void pnp_init_resources(struct pnp_dev *dev)
 276 {
 277         pnp_init_resource_table(&dev->res);
 278 }
 279
 280 /**
 281  * pnp_clean_resources - clears resources that were not manually set
 282  * @res: the resources to clean
 283  */
 284 static void pnp_clean_resource_table(struct pnp_dev *dev)
 285 {
 286         struct pnp_resource_table *res = &dev->res;
 287         int idx;
 288
 289         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
 290                 if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
 291                         continue;
 292                 res->irq_resource[idx].start = -1;
 293                 res->irq_resource[idx].end = -1;
 294                 res->irq_resource[idx].flags =
 295                     IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
 296         }
 297         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
 298                 if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
 299                         continue;
 300                 res->dma_resource[idx].start = -1;
 301                 res->dma_resource[idx].end = -1;
 302                 res->dma_resource[idx].flags =
 303                     IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
 304         }
 305         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
 306                 if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
 307                         continue;
 308                 res->port_resource[idx].start = 0;
 309                 res->port_resource[idx].end = 0;
 310                 res->port_resource[idx].flags =
 311                     IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
 312         }
 313         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
 314                 if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
 315                         continue;
 316                 res->mem_resource[idx].start = 0;
 317                 res->mem_resource[idx].end = 0;
 318                 res->mem_resource[idx].flags =
 319                     IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
 320         }
 321 }
 322
 323 /**
 324  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
 325  * @dev: pointer to the desired device
 326  * @depnum: the dependent function number
 327  *
 328  * Only set depnum to 0 if the device does not have dependent options.
 329  */
 330 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
 331 {
 332         struct pnp_port *port;
 333         struct pnp_mem *mem;
 334         struct pnp_irq *irq;
 335         struct pnp_dma *dma;
 336         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
 337
 338         if (!pnp_can_configure(dev))
 339                 return -ENODEV;
 340
 341         dbg_pnp_show_resources(dev, "before pnp_assign_resources");
 342         mutex_lock(&pnp_res_mutex);
 343         pnp_clean_resource_table(dev);
 344         if (dev->independent) {
 345                 dev_dbg(&dev->dev, "assigning independent options\n");
 346                 port = dev->independent->port;
 347                 mem = dev->independent->mem;
 348                 irq = dev->independent->irq;
 349                 dma = dev->independent->dma;
 350                 while (port) {
 351                         if (!pnp_assign_port(dev, port, nport))
 352                                 goto fail;
 353                         nport++;
 354                         port = port->next;
 355                 }
 356                 while (mem) {
 357                         if (!pnp_assign_mem(dev, mem, nmem))
 358                                 goto fail;
 359                         nmem++;
 360                         mem = mem->next;
 361                 }
 362                 while (irq) {
 363                         if (!pnp_assign_irq(dev, irq, nirq))
 364                                 goto fail;
 365                         nirq++;
 366                         irq = irq->next;
 367                 }
 368                 while (dma) {
 369                         pnp_assign_dma(dev, dma, ndma);
 370                         ndma++;
 371                         dma = dma->next;
 372                 }
 373         }
 374
 375         if (depnum) {
 376                 struct pnp_option *dep;
 377                 int i;
 378
 379                 dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
 380                 for (i = 1, dep = dev->dependent; i < depnum;
 381                      i++, dep = dep->next)
 382                         if (!dep)
 383                                 goto fail;
 384                 port = dep->port;
 385                 mem = dep->mem;
 386                 irq = dep->irq;
 387                 dma = dep->dma;
 388                 while (port) {
 389                         if (!pnp_assign_port(dev, port, nport))
 390                                 goto fail;
 391                         nport++;
 392                         port = port->next;
 393                 }
 394                 while (mem) {
 395                         if (!pnp_assign_mem(dev, mem, nmem))
 396                                 goto fail;
 397                         nmem++;
 398                         mem = mem->next;
 399                 }
 400                 while (irq) {
 401                         if (!pnp_assign_irq(dev, irq, nirq))
 402                                 goto fail;
 403                         nirq++;
 404                         irq = irq->next;
 405                 }
 406                 while (dma) {
 407                         pnp_assign_dma(dev, dma, ndma);
 408                         ndma++;
 409                         dma = dma->next;
 410                 }
 411         } else if (dev->dependent)
 412                 goto fail;
 413
 414         mutex_unlock(&pnp_res_mutex);
 415         dbg_pnp_show_resources(dev, "after pnp_assign_resources");
 416         return 1;
 417
 418 fail:
 419         pnp_clean_resource_table(dev);
 420         mutex_unlock(&pnp_res_mutex);
 421         dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
 422         return 0;
 423 }
 424
 425 /**
 426  * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
 427  * @dev: pointer to the desired device
 428  * @res: pointer to the new resource config
 429  * @mode: 0 or PNP_CONFIG_FORCE
 430  *
 431  * This function can be used by drivers that want to manually set thier resources.
 432  */
 433 int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table *res,
 434                           int mode)
 435 {
 436         int i;
 437         struct pnp_resource_table *bak;
 438
 439         if (!pnp_can_configure(dev))
 440                 return -ENODEV;
 441         bak = pnp_alloc(sizeof(struct pnp_resource_table));
 442         if (!bak)
 443                 return -ENOMEM;
 444         *bak = dev->res;
 445
 446         mutex_lock(&pnp_res_mutex);
 447         dev->res = *res;
 448         if (!(mode & PNP_CONFIG_FORCE)) {
 449                 for (i = 0; i < PNP_MAX_PORT; i++) {
 450                         if (!pnp_check_port(dev, i))
 451                                 goto fail;
 452                 }
 453                 for (i = 0; i < PNP_MAX_MEM; i++) {
 454                         if (!pnp_check_mem(dev, i))
 455                                 goto fail;
 456                 }
 457                 for (i = 0; i < PNP_MAX_IRQ; i++) {
 458                         if (!pnp_check_irq(dev, i))
 459                                 goto fail;
 460                 }
 461                 for (i = 0; i < PNP_MAX_DMA; i++) {
 462                         if (!pnp_check_dma(dev, i))
 463                                 goto fail;
 464                 }
 465         }
 466         mutex_unlock(&pnp_res_mutex);
 467
 468         kfree(bak);
 469         return 0;
 470
 471 fail:
 472         dev->res = *bak;
 473         mutex_unlock(&pnp_res_mutex);
 474         kfree(bak);
 475         return -EINVAL;
 476 }
 477
 478 /**
 479  * pnp_auto_config_dev - automatically assigns resources to a device
 480  * @dev: pointer to the desired device
 481  */
 482 int pnp_auto_config_dev(struct pnp_dev *dev)
 483 {
 484         struct pnp_option *dep;
 485         int i = 1;
 486
 487         if (!pnp_can_configure(dev)) {
 488                 dev_dbg(&dev->dev, "configuration not supported\n");
 489                 return -ENODEV;
 490         }
 491
 492         if (!dev->dependent) {
 493                 if (pnp_assign_resources(dev, 0))
 494                         return 0;
 495         } else {
 496                 dep = dev->dependent;
 497                 do {
 498                         if (pnp_assign_resources(dev, i))
 499                                 return 0;
 500                         dep = dep->next;
 501                         i++;
 502                 } while (dep);
 503         }
 504
 505         dev_err(&dev->dev, "unable to assign resources\n");
 506         return -EBUSY;
 507 }
 508
 509 /**
 510  * pnp_start_dev - low-level start of the PnP device
 511  * @dev: pointer to the desired device
 512  *
 513  * assumes that resources have already been allocated
 514  */
 515 int pnp_start_dev(struct pnp_dev *dev)
 516 {
 517         if (!pnp_can_write(dev)) {
 518                 dev_dbg(&dev->dev, "activation not supported\n");
 519                 return -EINVAL;
 520         }
 521
 522         dbg_pnp_show_resources(dev, "pnp_start_dev");
 523         if (dev->protocol->set(dev) < 0) {
 524                 dev_err(&dev->dev, "activation failed\n");
 525                 return -EIO;
 526         }
 527
 528         dev_info(&dev->dev, "activated\n");
 529         return 0;
 530 }
 531
 532 /**
 533  * pnp_stop_dev - low-level disable of the PnP device
 534  * @dev: pointer to the desired device
 535  *
 536  * does not free resources
 537  */
 538 int pnp_stop_dev(struct pnp_dev *dev)
 539 {
 540         if (!pnp_can_disable(dev)) {
 541                 dev_dbg(&dev->dev, "disabling not supported\n");
 542                 return -EINVAL;
 543         }
 544         if (dev->protocol->disable(dev) < 0) {
 545                 dev_err(&dev->dev, "disable failed\n");
 546                 return -EIO;
 547         }
 548
 549         dev_info(&dev->dev, "disabled\n");
 550         return 0;
 551 }
 552
 553 /**
 554  * pnp_activate_dev - activates a PnP device for use
 555  * @dev: pointer to the desired device
 556  *
 557  * does not validate or set resources so be careful.
 558  */
 559 int pnp_activate_dev(struct pnp_dev *dev)
 560 {
 561         int error;
 562
 563         if (dev->active)
 564                 return 0;
 565
 566         /* ensure resources are allocated */
 567         if (pnp_auto_config_dev(dev))
 568                 return -EBUSY;
 569
 570         error = pnp_start_dev(dev);
 571         if (error)
 572                 return error;
 573
 574         dev->active = 1;
 575         return 0;
 576 }
 577
 578 /**
 579  * pnp_disable_dev - disables device
 580  * @dev: pointer to the desired device
 581  *
 582  * inform the correct pnp protocol so that resources can be used by other devices
 583  */
 584 int pnp_disable_dev(struct pnp_dev *dev)
 585 {
 586         int error;
 587
 588         if (!dev->active)
 589                 return 0;
 590
 591         error = pnp_stop_dev(dev);
 592         if (error)
 593                 return error;
 594
 595         dev->active = 0;
 596
 597         /* release the resources so that other devices can use them */
 598         mutex_lock(&pnp_res_mutex);
 599         pnp_clean_resource_table(dev);
 600         mutex_unlock(&pnp_res_mutex);
 601
 602         return 0;
 603 }
 604
 605 /**
 606  * pnp_resource_change - change one resource
 607  * @resource: pointer to resource to be changed
 608  * @start: start of region
 609  * @size: size of region
 610  */
 611 void pnp_resource_change(struct resource *resource, resource_size_t start,
 612                          resource_size_t size)
 613 {
 614         resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
 615         resource->start = start;
 616         resource->end = start + size - 1;
 617 }
 618
 619 EXPORT_SYMBOL(pnp_manual_config_dev);
 620 EXPORT_SYMBOL(pnp_start_dev);
 621 EXPORT_SYMBOL(pnp_stop_dev);
 622 EXPORT_SYMBOL(pnp_activate_dev);
 623 EXPORT_SYMBOL(pnp_disable_dev);
 624 EXPORT_SYMBOL(pnp_resource_change);
 625 EXPORT_SYMBOL(pnp_init_resource_table);