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         resource_size_t *start, *end;
  24         unsigned long *flags;
  25
  26         if (!dev || !rule)
  27                 return -EINVAL;
  28
  29         if (idx >= PNP_MAX_PORT) {
  30                 pnp_err("More than 4 ports is incompatible with pnp specifications.");
  31                 /* pretend we were successful so at least the manager won't try again */
  32                 return 1;
  33         }
  34
  35         /* check if this resource has been manually set, if so skip */
  36         if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
  37                 return 1;
  38
  39         start = &dev->res.port_resource[idx].start;
  40         end = &dev->res.port_resource[idx].end;
  41         flags = &dev->res.port_resource[idx].flags;
  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                 return 1; /* skip disabled resource requests */
  50         }
  51
  52         *start = rule->min;
  53         *end = *start + rule->size - 1;
  54
  55         /* run through until pnp_check_port is happy */
  56         while (!pnp_check_port(dev, idx)) {
  57                 *start += rule->align;
  58                 *end = *start + rule->size - 1;
  59                 if (*start > rule->max || !rule->align)
  60                         return 0;
  61         }
  62         return 1;
  63 }
  64
  65 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
  66 {
  67         resource_size_t *start, *end;
  68         unsigned long *flags;
  69
  70         if (!dev || !rule)
  71                 return -EINVAL;
  72
  73         if (idx >= PNP_MAX_MEM) {
  74                 pnp_err("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("More than 2 irqs is incompatible with pnp specifications.");
 135                 /* pretend we were successful so at least the manager won't try again */
 136                 return 1;
 137         }
 138
 139         /* check if this resource has been manually set, if so skip */
 140         if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
 141                 return 1;
 142
 143         start = &dev->res.irq_resource[idx].start;
 144         end = &dev->res.irq_resource[idx].end;
 145         flags = &dev->res.irq_resource[idx].flags;
 146
 147         /* set the initial values */
 148         *flags |= rule->flags | IORESOURCE_IRQ;
 149         *flags &=  ~IORESOURCE_UNSET;
 150
 151         if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
 152                 *flags |= IORESOURCE_DISABLED;
 153                 return 1; /* skip disabled resource requests */
 154         }
 155
 156         /* TBD: need check for >16 IRQ */
 157         *start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
 158         if (*start < PNP_IRQ_NR) {
 159                 *end = *start;
 160                 return 1;
 161         }
 162         for (i = 0; i < 16; i++) {
 163                 if(test_bit(xtab[i], rule->map)) {
 164                         *start = *end = xtab[i];
 165                         if(pnp_check_irq(dev, idx))
 166                                 return 1;
 167                 }
 168         }
 169         return 0;
 170 }
 171
 172 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
 173 {
 174         resource_size_t *start, *end;
 175         unsigned long *flags;
 176         int i;
 177
 178         /* DMA priority: this table is good for i386 */
 179         static unsigned short xtab[8] = {
 180                 1, 3, 5, 6, 7, 0, 2, 4
 181         };
 182
 183         if (!dev || !rule)
 184                 return -EINVAL;
 185
 186         if (idx >= PNP_MAX_DMA) {
 187                 pnp_err("More than 2 dmas is incompatible with pnp specifications.");
 188                 /* pretend we were successful so at least the manager won't try again */
 189                 return 1;
 190         }
 191
 192         /* check if this resource has been manually set, if so skip */
 193         if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
 194                 return 1;
 195
 196         start = &dev->res.dma_resource[idx].start;
 197         end = &dev->res.dma_resource[idx].end;
 198         flags = &dev->res.dma_resource[idx].flags;
 199
 200         /* set the initial values */
 201         *flags |= rule->flags | IORESOURCE_DMA;
 202         *flags &=  ~IORESOURCE_UNSET;
 203
 204         if (!rule->map) {
 205                 *flags |= IORESOURCE_DISABLED;
 206                 return 1; /* skip disabled resource requests */
 207         }
 208
 209         for (i = 0; i < 8; i++) {
 210                 if(rule->map & (1<<xtab[i])) {
 211                         *start = *end = xtab[i];
 212                         if(pnp_check_dma(dev, idx))
 213                                 return 1;
 214                 }
 215         }
 216         return 0;
 217 }
 218
 219 /**
 220  * pnp_init_resources - Resets a resource table to default values.
 221  * @table: pointer to the desired resource table
 222  *
 223  */
 224 void pnp_init_resource_table(struct pnp_resource_table *table)
 225 {
 226         int idx;
 227         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
 228                 table->irq_resource[idx].name = NULL;
 229                 table->irq_resource[idx].start = -1;
 230                 table->irq_resource[idx].end = -1;
 231                 table->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
 232         }
 233         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
 234                 table->dma_resource[idx].name = NULL;
 235                 table->dma_resource[idx].start = -1;
 236                 table->dma_resource[idx].end = -1;
 237                 table->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
 238         }
 239         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
 240                 table->port_resource[idx].name = NULL;
 241                 table->port_resource[idx].start = 0;
 242                 table->port_resource[idx].end = 0;
 243                 table->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
 244         }
 245         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
 246                 table->mem_resource[idx].name = NULL;
 247                 table->mem_resource[idx].start = 0;
 248                 table->mem_resource[idx].end = 0;
 249                 table->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
 250         }
 251 }
 252
 253 /**
 254  * pnp_clean_resources - clears resources that were not manually set
 255  * @res: the resources to clean
 256  *
 257  */
 258 static void pnp_clean_resource_table(struct pnp_resource_table * res)
 259 {
 260         int idx;
 261         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
 262                 if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
 263                         continue;
 264                 res->irq_resource[idx].start = -1;
 265                 res->irq_resource[idx].end = -1;
 266                 res->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
 267         }
 268         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
 269                 if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
 270                         continue;
 271                 res->dma_resource[idx].start = -1;
 272                 res->dma_resource[idx].end = -1;
 273                 res->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
 274         }
 275         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
 276                 if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
 277                         continue;
 278                 res->port_resource[idx].start = 0;
 279                 res->port_resource[idx].end = 0;
 280                 res->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
 281         }
 282         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
 283                 if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
 284                         continue;
 285                 res->mem_resource[idx].start = 0;
 286                 res->mem_resource[idx].end = 0;
 287                 res->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
 288         }
 289 }
 290
 291 /**
 292  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
 293  * @dev: pointer to the desired device
 294  * @depnum: the dependent function number
 295  *
 296  * Only set depnum to 0 if the device does not have dependent options.
 297  */
 298 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
 299 {
 300         struct pnp_port *port;
 301         struct pnp_mem *mem;
 302         struct pnp_irq *irq;
 303         struct pnp_dma *dma;
 304         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
 305
 306         if (!pnp_can_configure(dev))
 307                 return -ENODEV;
 308
 309         down(&pnp_res_mutex);
 310         pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
 311         if (dev->independent) {
 312                 port = dev->independent->port;
 313                 mem = dev->independent->mem;
 314                 irq = dev->independent->irq;
 315                 dma = dev->independent->dma;
 316                 while (port) {
 317                         if (!pnp_assign_port(dev, port, nport))
 318                                 goto fail;
 319                         nport++;
 320                         port = port->next;
 321                 }
 322                 while (mem) {
 323                         if (!pnp_assign_mem(dev, mem, nmem))
 324                                 goto fail;
 325                         nmem++;
 326                         mem = mem->next;
 327                 }
 328                 while (irq) {
 329                         if (!pnp_assign_irq(dev, irq, nirq))
 330                                 goto fail;
 331                         nirq++;
 332                         irq = irq->next;
 333                 }
 334                 while (dma) {
 335                         if (!pnp_assign_dma(dev, dma, ndma))
 336                                 goto fail;
 337                         ndma++;
 338                         dma = dma->next;
 339                 }
 340         }
 341
 342         if (depnum) {
 343                 struct pnp_option *dep;
 344                 int i;
 345                 for (i=1,dep=dev->dependent; i<depnum; i++, dep=dep->next)
 346                         if(!dep)
 347                                 goto fail;
 348                 port =dep->port;
 349                 mem = dep->mem;
 350                 irq = dep->irq;
 351                 dma = dep->dma;
 352                 while (port) {
 353                         if (!pnp_assign_port(dev, port, nport))
 354                                 goto fail;
 355                         nport++;
 356                         port = port->next;
 357                 }
 358                 while (mem) {
 359                         if (!pnp_assign_mem(dev, mem, nmem))
 360                                 goto fail;
 361                         nmem++;
 362                         mem = mem->next;
 363                 }
 364                 while (irq) {
 365                         if (!pnp_assign_irq(dev, irq, nirq))
 366                                 goto fail;
 367                         nirq++;
 368                         irq = irq->next;
 369                 }
 370                 while (dma) {
 371                         if (!pnp_assign_dma(dev, dma, ndma))
 372                                 goto fail;
 373                         ndma++;
 374                         dma = dma->next;
 375                 }
 376         } else if (dev->dependent)
 377                 goto fail;
 378
 379         up(&pnp_res_mutex);
 380         return 1;
 381
 382 fail:
 383         pnp_clean_resource_table(&dev->res);
 384         up(&pnp_res_mutex);
 385         return 0;
 386 }
 387
 388 /**
 389  * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
 390  * @dev: pointer to the desired device
 391  * @res: pointer to the new resource config
 392  * @mode: 0 or PNP_CONFIG_FORCE
 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_start_dev - low-level start of the PnP device
 478  * @dev: pointer to the desired device
 479  *
 480  * assumes that resources have alread been allocated
 481  */
 482
 483 int pnp_start_dev(struct pnp_dev *dev)
 484 {
 485         if (!pnp_can_write(dev)) {
 486                 pnp_info("Device %s does not support activation.", dev->dev.bus_id);
 487                 return -EINVAL;
 488         }
 489
 490         if (dev->protocol->set(dev, &dev->res)<0) {
 491                 pnp_err("Failed to activate device %s.", dev->dev.bus_id);
 492                 return -EIO;
 493         }
 494
 495         pnp_info("Device %s activated.", dev->dev.bus_id);
 496
 497         return 0;
 498 }
 499
 500 /**
 501  * pnp_stop_dev - low-level disable of the PnP device
 502  * @dev: pointer to the desired device
 503  *
 504  * does not free resources
 505  */
 506
 507 int pnp_stop_dev(struct pnp_dev *dev)
 508 {
 509         if (!pnp_can_disable(dev)) {
 510                 pnp_info("Device %s does not support disabling.", dev->dev.bus_id);
 511                 return -EINVAL;
 512         }
 513         if (dev->protocol->disable(dev)<0) {
 514                 pnp_err("Failed to disable device %s.", dev->dev.bus_id);
 515                 return -EIO;
 516         }
 517
 518         pnp_info("Device %s disabled.", dev->dev.bus_id);
 519
 520         return 0;
 521 }
 522
 523 /**
 524  * pnp_activate_dev - activates a PnP device for use
 525  * @dev: pointer to the desired device
 526  *
 527  * does not validate or set resources so be careful.
 528  */
 529 int pnp_activate_dev(struct pnp_dev *dev)
 530 {
 531         int error;
 532
 533         if (!dev)
 534                 return -EINVAL;
 535         if (dev->active) {
 536                 return 0; /* the device is already active */
 537         }
 538
 539         /* ensure resources are allocated */
 540         if (pnp_auto_config_dev(dev))
 541                 return -EBUSY;
 542
 543         error = pnp_start_dev(dev);
 544         if (error)
 545                 return error;
 546
 547         dev->active = 1;
 548
 549         return 1;
 550 }
 551
 552 /**
 553  * pnp_disable_dev - disables device
 554  * @dev: pointer to the desired device
 555  *
 556  * inform the correct pnp protocol so that resources can be used by other devices
 557  */
 558 int pnp_disable_dev(struct pnp_dev *dev)
 559 {
 560         int error;
 561
 562         if (!dev)
 563                 return -EINVAL;
 564         if (!dev->active) {
 565                 return 0; /* the device is already disabled */
 566         }
 567
 568         error = pnp_stop_dev(dev);
 569         if (error)
 570                 return error;
 571
 572         dev->active = 0;
 573
 574         /* release the resources so that other devices can use them */
 575         down(&pnp_res_mutex);
 576         pnp_clean_resource_table(&dev->res);
 577         up(&pnp_res_mutex);
 578
 579         return 1;
 580 }
 581
 582 /**
 583  * pnp_resource_change - change one resource
 584  * @resource: pointer to resource to be changed
 585  * @start: start of region
 586  * @size: size of region
 587  *
 588  */
 589 void pnp_resource_change(struct resource *resource, resource_size_t start,
 590                                 resource_size_t size)
 591 {
 592         if (resource == NULL)
 593                 return;
 594         resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
 595         resource->start = start;
 596         resource->end = start + size - 1;
 597 }
 598
 599
 600 EXPORT_SYMBOL(pnp_manual_config_dev);
 601 #if 0
 602 EXPORT_SYMBOL(pnp_auto_config_dev);
 603 #endif
 604 EXPORT_SYMBOL(pnp_start_dev);
 605 EXPORT_SYMBOL(pnp_stop_dev);
 606 EXPORT_SYMBOL(pnp_activate_dev);
 607 EXPORT_SYMBOL(pnp_disable_dev);
 608 EXPORT_SYMBOL(pnp_resource_change);
 609 EXPORT_SYMBOL(pnp_init_resource_table);