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 resource *res, local_res;
  23
  24         res = pnp_get_resource(dev, IORESOURCE_IO, idx);
  25         if (res) {
  26                 dev_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
  27                         "flags %#lx\n", idx, (unsigned long long) res->start,
  28                         (unsigned long long) res->end, res->flags);
  29                 return 0;
  30         }
  31
  32         res = &local_res;
  33         res->flags = rule->flags | IORESOURCE_AUTO;
  34         res->start = 0;
  35         res->end = 0;
  36
  37         if (!rule->size) {
  38                 res->flags |= IORESOURCE_DISABLED;
  39                 dev_dbg(&dev->dev, "  io %d disabled\n", idx);
  40                 goto __add;
  41         }
  42
  43         res->start = rule->min;
  44         res->end = res->start + rule->size - 1;
  45
  46         while (!pnp_check_port(dev, res)) {
  47                 res->start += rule->align;
  48                 res->end = res->start + rule->size - 1;
  49                 if (res->start > rule->max || !rule->align) {
  50                         dev_dbg(&dev->dev, "  couldn't assign io %d "
  51                                 "(min %#llx max %#llx)\n", idx,
  52                                 (unsigned long long) rule->min,
  53                                 (unsigned long long) rule->max);
  54                         return -EBUSY;
  55                 }
  56         }
  57
  58 __add:
  59         pnp_add_io_resource(dev, res->start, res->end, res->flags);
  60         return 0;
  61 }
  62
  63 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
  64 {
  65         struct resource *res, local_res;
  66
  67         res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
  68         if (res) {
  69                 dev_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
  70                         "flags %#lx\n", idx, (unsigned long long) res->start,
  71                         (unsigned long long) res->end, res->flags);
  72                 return 0;
  73         }
  74
  75         res = &local_res;
  76         res->flags = rule->flags | IORESOURCE_AUTO;
  77         res->start = 0;
  78         res->end = 0;
  79
  80         if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
  81                 res->flags |= IORESOURCE_READONLY;
  82         if (rule->flags & IORESOURCE_MEM_CACHEABLE)
  83                 res->flags |= IORESOURCE_CACHEABLE;
  84         if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
  85                 res->flags |= IORESOURCE_RANGELENGTH;
  86         if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
  87                 res->flags |= IORESOURCE_SHADOWABLE;
  88
  89         if (!rule->size) {
  90                 res->flags |= IORESOURCE_DISABLED;
  91                 dev_dbg(&dev->dev, "  mem %d disabled\n", idx);
  92                 goto __add;
  93         }
  94
  95         res->start = rule->min;
  96         res->end = res->start + rule->size - 1;
  97
  98         while (!pnp_check_mem(dev, res)) {
  99                 res->start += rule->align;
 100                 res->end = res->start + rule->size - 1;
 101                 if (res->start > rule->max || !rule->align) {
 102                         dev_dbg(&dev->dev, "  couldn't assign mem %d "
 103                                 "(min %#llx max %#llx)\n", idx,
 104                                 (unsigned long long) rule->min,
 105                                 (unsigned long long) rule->max);
 106                         return -EBUSY;
 107                 }
 108         }
 109
 110 __add:
 111         pnp_add_mem_resource(dev, res->start, res->end, res->flags);
 112         return 0;
 113 }
 114
 115 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
 116 {
 117         struct resource *res, local_res;
 118         int i;
 119
 120         /* IRQ priority: this table is good for i386 */
 121         static unsigned short xtab[16] = {
 122                 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
 123         };
 124
 125         res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
 126         if (res) {
 127                 dev_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
 128                         idx, (int) res->start, res->flags);
 129                 return 0;
 130         }
 131
 132         res = &local_res;
 133         res->flags = rule->flags | IORESOURCE_AUTO;
 134         res->start = -1;
 135         res->end = -1;
 136
 137         if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
 138                 res->flags |= IORESOURCE_DISABLED;
 139                 dev_dbg(&dev->dev, "  irq %d disabled\n", idx);
 140                 goto __add;
 141         }
 142
 143         /* TBD: need check for >16 IRQ */
 144         res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
 145         if (res->start < PNP_IRQ_NR) {
 146                 res->end = res->start;
 147                 goto __add;
 148         }
 149         for (i = 0; i < 16; i++) {
 150                 if (test_bit(xtab[i], rule->map.bits)) {
 151                         res->start = res->end = xtab[i];
 152                         if (pnp_check_irq(dev, res))
 153                                 goto __add;
 154                 }
 155         }
 156
 157         if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
 158                 res->start = -1;
 159                 res->end = -1;
 160                 res->flags |= IORESOURCE_DISABLED;
 161                 dev_dbg(&dev->dev, "  irq %d disabled (optional)\n", idx);
 162                 goto __add;
 163         }
 164
 165         dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
 166         return -EBUSY;
 167
 168 __add:
 169         pnp_add_irq_resource(dev, res->start, res->flags);
 170         return 0;
 171 }
 172
 173 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
 174 {
 175         struct resource *res, local_res;
 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         res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
 184         if (res) {
 185                 dev_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
 186                         idx, (int) res->start, res->flags);
 187                 return 0;
 188         }
 189
 190         res = &local_res;
 191         res->flags = rule->flags | IORESOURCE_AUTO;
 192         res->start = -1;
 193         res->end = -1;
 194
 195         for (i = 0; i < 8; i++) {
 196                 if (rule->map & (1 << xtab[i])) {
 197                         res->start = res->end = xtab[i];
 198                         if (pnp_check_dma(dev, res))
 199                                 goto __add;
 200                 }
 201         }
 202 #ifdef MAX_DMA_CHANNELS
 203         res->start = res->end = MAX_DMA_CHANNELS;
 204 #endif
 205         res->flags |= IORESOURCE_DISABLED;
 206         dev_dbg(&dev->dev, "  disable dma %d\n", idx);
 207
 208 __add:
 209         pnp_add_dma_resource(dev, res->start, res->flags);
 210         return 0;
 211 }
 212
 213 void pnp_init_resources(struct pnp_dev *dev)
 214 {
 215         pnp_free_resources(dev);
 216 }
 217
 218 static void pnp_clean_resource_table(struct pnp_dev *dev)
 219 {
 220         struct pnp_resource *pnp_res, *tmp;
 221
 222         list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
 223                 if (pnp_res->res.flags & IORESOURCE_AUTO)
 224                         pnp_free_resource(pnp_res);
 225         }
 226 }
 227
 228 /**
 229  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
 230  * @dev: pointer to the desired device
 231  * @depnum: the dependent function number
 232  *
 233  * Only set depnum to 0 if the device does not have dependent options.
 234  */
 235 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
 236 {
 237         struct pnp_port *port;
 238         struct pnp_mem *mem;
 239         struct pnp_irq *irq;
 240         struct pnp_dma *dma;
 241         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
 242
 243         dbg_pnp_show_resources(dev, "before pnp_assign_resources");
 244         mutex_lock(&pnp_res_mutex);
 245         pnp_clean_resource_table(dev);
 246         if (dev->independent) {
 247                 dev_dbg(&dev->dev, "assigning independent options\n");
 248                 port = dev->independent->port;
 249                 mem = dev->independent->mem;
 250                 irq = dev->independent->irq;
 251                 dma = dev->independent->dma;
 252                 while (port) {
 253                         if (pnp_assign_port(dev, port, nport) < 0)
 254                                 goto fail;
 255                         nport++;
 256                         port = port->next;
 257                 }
 258                 while (mem) {
 259                         if (pnp_assign_mem(dev, mem, nmem) < 0)
 260                                 goto fail;
 261                         nmem++;
 262                         mem = mem->next;
 263                 }
 264                 while (irq) {
 265                         if (pnp_assign_irq(dev, irq, nirq) < 0)
 266                                 goto fail;
 267                         nirq++;
 268                         irq = irq->next;
 269                 }
 270                 while (dma) {
 271                         if (pnp_assign_dma(dev, dma, ndma) < 0)
 272                                 goto fail;
 273                         ndma++;
 274                         dma = dma->next;
 275                 }
 276         }
 277
 278         if (depnum) {
 279                 struct pnp_option *dep;
 280                 int i;
 281
 282                 dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
 283                 for (i = 1, dep = dev->dependent; i < depnum;
 284                      i++, dep = dep->next)
 285                         if (!dep)
 286                                 goto fail;
 287                 port = dep->port;
 288                 mem = dep->mem;
 289                 irq = dep->irq;
 290                 dma = dep->dma;
 291                 while (port) {
 292                         if (pnp_assign_port(dev, port, nport) < 0)
 293                                 goto fail;
 294                         nport++;
 295                         port = port->next;
 296                 }
 297                 while (mem) {
 298                         if (pnp_assign_mem(dev, mem, nmem) < 0)
 299                                 goto fail;
 300                         nmem++;
 301                         mem = mem->next;
 302                 }
 303                 while (irq) {
 304                         if (pnp_assign_irq(dev, irq, nirq) < 0)
 305                                 goto fail;
 306                         nirq++;
 307                         irq = irq->next;
 308                 }
 309                 while (dma) {
 310                         if (pnp_assign_dma(dev, dma, ndma) < 0)
 311                                 goto fail;
 312                         ndma++;
 313                         dma = dma->next;
 314                 }
 315         } else if (dev->dependent)
 316                 goto fail;
 317
 318         mutex_unlock(&pnp_res_mutex);
 319         dbg_pnp_show_resources(dev, "after pnp_assign_resources");
 320         return 1;
 321
 322 fail:
 323         pnp_clean_resource_table(dev);
 324         mutex_unlock(&pnp_res_mutex);
 325         dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
 326         return 0;
 327 }
 328
 329 /**
 330  * pnp_auto_config_dev - automatically assigns resources to a device
 331  * @dev: pointer to the desired device
 332  */
 333 int pnp_auto_config_dev(struct pnp_dev *dev)
 334 {
 335         struct pnp_option *dep;
 336         int i = 1;
 337
 338         if (!pnp_can_configure(dev)) {
 339                 dev_dbg(&dev->dev, "configuration not supported\n");
 340                 return -ENODEV;
 341         }
 342
 343         if (!dev->dependent) {
 344                 if (pnp_assign_resources(dev, 0))
 345                         return 0;
 346         } else {
 347                 dep = dev->dependent;
 348                 do {
 349                         if (pnp_assign_resources(dev, i))
 350                                 return 0;
 351                         dep = dep->next;
 352                         i++;
 353                 } while (dep);
 354         }
 355
 356         dev_err(&dev->dev, "unable to assign resources\n");
 357         return -EBUSY;
 358 }
 359
 360 /**
 361  * pnp_start_dev - low-level start of the PnP device
 362  * @dev: pointer to the desired device
 363  *
 364  * assumes that resources have already been allocated
 365  */
 366 int pnp_start_dev(struct pnp_dev *dev)
 367 {
 368         if (!pnp_can_write(dev)) {
 369                 dev_dbg(&dev->dev, "activation not supported\n");
 370                 return -EINVAL;
 371         }
 372
 373         dbg_pnp_show_resources(dev, "pnp_start_dev");
 374         if (dev->protocol->set(dev) < 0) {
 375                 dev_err(&dev->dev, "activation failed\n");
 376                 return -EIO;
 377         }
 378
 379         dev_info(&dev->dev, "activated\n");
 380         return 0;
 381 }
 382
 383 /**
 384  * pnp_stop_dev - low-level disable of the PnP device
 385  * @dev: pointer to the desired device
 386  *
 387  * does not free resources
 388  */
 389 int pnp_stop_dev(struct pnp_dev *dev)
 390 {
 391         if (!pnp_can_disable(dev)) {
 392                 dev_dbg(&dev->dev, "disabling not supported\n");
 393                 return -EINVAL;
 394         }
 395         if (dev->protocol->disable(dev) < 0) {
 396                 dev_err(&dev->dev, "disable failed\n");
 397                 return -EIO;
 398         }
 399
 400         dev_info(&dev->dev, "disabled\n");
 401         return 0;
 402 }
 403
 404 /**
 405  * pnp_activate_dev - activates a PnP device for use
 406  * @dev: pointer to the desired device
 407  *
 408  * does not validate or set resources so be careful.
 409  */
 410 int pnp_activate_dev(struct pnp_dev *dev)
 411 {
 412         int error;
 413
 414         if (dev->active)
 415                 return 0;
 416
 417         /* ensure resources are allocated */
 418         if (pnp_auto_config_dev(dev))
 419                 return -EBUSY;
 420
 421         error = pnp_start_dev(dev);
 422         if (error)
 423                 return error;
 424
 425         dev->active = 1;
 426         return 0;
 427 }
 428
 429 /**
 430  * pnp_disable_dev - disables device
 431  * @dev: pointer to the desired device
 432  *
 433  * inform the correct pnp protocol so that resources can be used by other devices
 434  */
 435 int pnp_disable_dev(struct pnp_dev *dev)
 436 {
 437         int error;
 438
 439         if (!dev->active)
 440                 return 0;
 441
 442         error = pnp_stop_dev(dev);
 443         if (error)
 444                 return error;
 445
 446         dev->active = 0;
 447
 448         /* release the resources so that other devices can use them */
 449         mutex_lock(&pnp_res_mutex);
 450         pnp_clean_resource_table(dev);
 451         mutex_unlock(&pnp_res_mutex);
 452
 453         return 0;
 454 }
 455
 456 EXPORT_SYMBOL(pnp_start_dev);
 457 EXPORT_SYMBOL(pnp_stop_dev);
 458 EXPORT_SYMBOL(pnp_activate_dev);
 459 EXPORT_SYMBOL(pnp_disable_dev);