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