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