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