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