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         dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
 157         return -EBUSY;
 158
 159 __add:
 160         pnp_add_irq_resource(dev, res->start, res->flags);
 161         return 0;
 162 }
 163
 164 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
 165 {
 166         struct resource *res, local_res;
 167         int i;
 168
 169         /* DMA priority: this table is good for i386 */
 170         static unsigned short xtab[8] = {
 171                 1, 3, 5, 6, 7, 0, 2, 4
 172         };
 173
 174         res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
 175         if (res) {
 176                 dev_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
 177                         idx, (int) res->start, res->flags);
 178                 return 0;
 179         }
 180
 181         res = &local_res;
 182         res->flags = rule->flags | IORESOURCE_AUTO;
 183         res->start = -1;
 184         res->end = -1;
 185
 186         for (i = 0; i < 8; i++) {
 187                 if (rule->map & (1 << xtab[i])) {
 188                         res->start = res->end = xtab[i];
 189                         if (pnp_check_dma(dev, res))
 190                                 goto __add;
 191                 }
 192         }
 193 #ifdef MAX_DMA_CHANNELS
 194         res->start = res->end = MAX_DMA_CHANNELS;
 195 #endif
 196         res->flags |= IORESOURCE_DISABLED;
 197         dev_dbg(&dev->dev, "  disable dma %d\n", idx);
 198
 199 __add:
 200         pnp_add_dma_resource(dev, res->start, res->flags);
 201         return 0;
 202 }
 203
 204 void pnp_init_resources(struct pnp_dev *dev)
 205 {
 206         pnp_free_resources(dev);
 207 }
 208
 209 static void pnp_clean_resource_table(struct pnp_dev *dev)
 210 {
 211         struct pnp_resource *pnp_res, *tmp;
 212
 213         list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
 214                 if (pnp_res->res.flags & IORESOURCE_AUTO)
 215                         pnp_free_resource(pnp_res);
 216         }
 217 }
 218
 219 /**
 220  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
 221  * @dev: pointer to the desired device
 222  * @depnum: the dependent function number
 223  *
 224  * Only set depnum to 0 if the device does not have dependent options.
 225  */
 226 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
 227 {
 228         struct pnp_port *port;
 229         struct pnp_mem *mem;
 230         struct pnp_irq *irq;
 231         struct pnp_dma *dma;
 232         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
 233
 234         dbg_pnp_show_resources(dev, "before pnp_assign_resources");
 235         mutex_lock(&pnp_res_mutex);
 236         pnp_clean_resource_table(dev);
 237         if (dev->independent) {
 238                 dev_dbg(&dev->dev, "assigning independent options\n");
 239                 port = dev->independent->port;
 240                 mem = dev->independent->mem;
 241                 irq = dev->independent->irq;
 242                 dma = dev->independent->dma;
 243                 while (port) {
 244                         if (pnp_assign_port(dev, port, nport) < 0)
 245                                 goto fail;
 246                         nport++;
 247                         port = port->next;
 248                 }
 249                 while (mem) {
 250                         if (pnp_assign_mem(dev, mem, nmem) < 0)
 251                                 goto fail;
 252                         nmem++;
 253                         mem = mem->next;
 254                 }
 255                 while (irq) {
 256                         if (pnp_assign_irq(dev, irq, nirq) < 0)
 257                                 goto fail;
 258                         nirq++;
 259                         irq = irq->next;
 260                 }
 261                 while (dma) {
 262                         if (pnp_assign_dma(dev, dma, ndma) < 0)
 263                                 goto fail;
 264                         ndma++;
 265                         dma = dma->next;
 266                 }
 267         }
 268
 269         if (depnum) {
 270                 struct pnp_option *dep;
 271                 int i;
 272
 273                 dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
 274                 for (i = 1, dep = dev->dependent; i < depnum;
 275                      i++, dep = dep->next)
 276                         if (!dep)
 277                                 goto fail;
 278                 port = dep->port;
 279                 mem = dep->mem;
 280                 irq = dep->irq;
 281                 dma = dep->dma;
 282                 while (port) {
 283                         if (pnp_assign_port(dev, port, nport) < 0)
 284                                 goto fail;
 285                         nport++;
 286                         port = port->next;
 287                 }
 288                 while (mem) {
 289                         if (pnp_assign_mem(dev, mem, nmem) < 0)
 290                                 goto fail;
 291                         nmem++;
 292                         mem = mem->next;
 293                 }
 294                 while (irq) {
 295                         if (pnp_assign_irq(dev, irq, nirq) < 0)
 296                                 goto fail;
 297                         nirq++;
 298                         irq = irq->next;
 299                 }
 300                 while (dma) {
 301                         if (pnp_assign_dma(dev, dma, ndma) < 0)
 302                                 goto fail;
 303                         ndma++;
 304                         dma = dma->next;
 305                 }
 306         } else if (dev->dependent)
 307                 goto fail;
 308
 309         mutex_unlock(&pnp_res_mutex);
 310         dbg_pnp_show_resources(dev, "after pnp_assign_resources");
 311         return 1;
 312
 313 fail:
 314         pnp_clean_resource_table(dev);
 315         mutex_unlock(&pnp_res_mutex);
 316         dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
 317         return 0;
 318 }
 319
 320 /**
 321  * pnp_auto_config_dev - automatically assigns resources to a device
 322  * @dev: pointer to the desired device
 323  */
 324 int pnp_auto_config_dev(struct pnp_dev *dev)
 325 {
 326         struct pnp_option *dep;
 327         int i = 1;
 328
 329         if (!pnp_can_configure(dev)) {
 330                 dev_dbg(&dev->dev, "configuration not supported\n");
 331                 return -ENODEV;
 332         }
 333
 334         if (!dev->dependent) {
 335                 if (pnp_assign_resources(dev, 0))
 336                         return 0;
 337         } else {
 338                 dep = dev->dependent;
 339                 do {
 340                         if (pnp_assign_resources(dev, i))
 341                                 return 0;
 342                         dep = dep->next;
 343                         i++;
 344                 } while (dep);
 345         }
 346
 347         dev_err(&dev->dev, "unable to assign resources\n");
 348         return -EBUSY;
 349 }
 350
 351 /**
 352  * pnp_start_dev - low-level start of the PnP device
 353  * @dev: pointer to the desired device
 354  *
 355  * assumes that resources have already been allocated
 356  */
 357 int pnp_start_dev(struct pnp_dev *dev)
 358 {
 359         if (!pnp_can_write(dev)) {
 360                 dev_dbg(&dev->dev, "activation not supported\n");
 361                 return -EINVAL;
 362         }
 363
 364         dbg_pnp_show_resources(dev, "pnp_start_dev");
 365         if (dev->protocol->set(dev) < 0) {
 366                 dev_err(&dev->dev, "activation failed\n");
 367                 return -EIO;
 368         }
 369
 370         dev_info(&dev->dev, "activated\n");
 371         return 0;
 372 }
 373
 374 /**
 375  * pnp_stop_dev - low-level disable of the PnP device
 376  * @dev: pointer to the desired device
 377  *
 378  * does not free resources
 379  */
 380 int pnp_stop_dev(struct pnp_dev *dev)
 381 {
 382         if (!pnp_can_disable(dev)) {
 383                 dev_dbg(&dev->dev, "disabling not supported\n");
 384                 return -EINVAL;
 385         }
 386         if (dev->protocol->disable(dev) < 0) {
 387                 dev_err(&dev->dev, "disable failed\n");
 388                 return -EIO;
 389         }
 390
 391         dev_info(&dev->dev, "disabled\n");
 392         return 0;
 393 }
 394
 395 /**
 396  * pnp_activate_dev - activates a PnP device for use
 397  * @dev: pointer to the desired device
 398  *
 399  * does not validate or set resources so be careful.
 400  */
 401 int pnp_activate_dev(struct pnp_dev *dev)
 402 {
 403         int error;
 404
 405         if (dev->active)
 406                 return 0;
 407
 408         /* ensure resources are allocated */
 409         if (pnp_auto_config_dev(dev))
 410                 return -EBUSY;
 411
 412         error = pnp_start_dev(dev);
 413         if (error)
 414                 return error;
 415
 416         dev->active = 1;
 417         return 0;
 418 }
 419
 420 /**
 421  * pnp_disable_dev - disables device
 422  * @dev: pointer to the desired device
 423  *
 424  * inform the correct pnp protocol so that resources can be used by other devices
 425  */
 426 int pnp_disable_dev(struct pnp_dev *dev)
 427 {
 428         int error;
 429
 430         if (!dev->active)
 431                 return 0;
 432
 433         error = pnp_stop_dev(dev);
 434         if (error)
 435                 return error;
 436
 437         dev->active = 0;
 438
 439         /* release the resources so that other devices can use them */
 440         mutex_lock(&pnp_res_mutex);
 441         pnp_clean_resource_table(dev);
 442         mutex_unlock(&pnp_res_mutex);
 443
 444         return 0;
 445 }
 446
 447 EXPORT_SYMBOL(pnp_start_dev);
 448 EXPORT_SYMBOL(pnp_stop_dev);
 449 EXPORT_SYMBOL(pnp_activate_dev);
 450 EXPORT_SYMBOL(pnp_disable_dev);