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