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 <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 1;
  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\n", idx);
  51                         return 0;
  52                 }
  53         }
  54
  55 __add:
  56         pnp_add_io_resource(dev, res->start, res->end, res->flags);
  57         return 1;
  58 }
  59
  60 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
  61 {
  62         struct resource *res, local_res;
  63
  64         res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
  65         if (res) {
  66                 dev_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
  67                         "flags %#lx\n", idx, (unsigned long long) res->start,
  68                         (unsigned long long) res->end, res->flags);
  69                 return 1;
  70         }
  71
  72         res = &local_res;
  73         res->flags = rule->flags | IORESOURCE_AUTO;
  74         res->start = 0;
  75         res->end = 0;
  76
  77         if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
  78                 res->flags |= IORESOURCE_READONLY;
  79         if (rule->flags & IORESOURCE_MEM_CACHEABLE)
  80                 res->flags |= IORESOURCE_CACHEABLE;
  81         if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
  82                 res->flags |= IORESOURCE_RANGELENGTH;
  83         if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
  84                 res->flags |= IORESOURCE_SHADOWABLE;
  85
  86         if (!rule->size) {
  87                 res->flags |= IORESOURCE_DISABLED;
  88                 dev_dbg(&dev->dev, "  mem %d disabled\n", idx);
  89                 goto __add;
  90         }
  91
  92         res->start = rule->min;
  93         res->end = res->start + rule->size - 1;
  94
  95         while (!pnp_check_mem(dev, res)) {
  96                 res->start += rule->align;
  97                 res->end = res->start + rule->size - 1;
  98                 if (res->start > rule->max || !rule->align) {
  99                         dev_dbg(&dev->dev, "  couldn't assign mem %d\n", idx);
 100                         return 0;
 101                 }
 102         }
 103
 104 __add:
 105         pnp_add_mem_resource(dev, res->start, res->end, res->flags);
 106         return 1;
 107 }
 108
 109 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
 110 {
 111         struct resource *res, local_res;
 112         int i;
 113
 114         /* IRQ priority: this table is good for i386 */
 115         static unsigned short xtab[16] = {
 116                 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
 117         };
 118
 119         res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
 120         if (res) {
 121                 dev_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
 122                         idx, (int) res->start, res->flags);
 123                 return 1;
 124         }
 125
 126         res = &local_res;
 127         res->flags = rule->flags | IORESOURCE_AUTO;
 128         res->start = -1;
 129         res->end = -1;
 130
 131         if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
 132                 res->flags |= IORESOURCE_DISABLED;
 133                 dev_dbg(&dev->dev, "  irq %d disabled\n", idx);
 134                 goto __add;
 135         }
 136
 137         /* TBD: need check for >16 IRQ */
 138         res->start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
 139         if (res->start < PNP_IRQ_NR) {
 140                 res->end = res->start;
 141                 goto __add;
 142         }
 143         for (i = 0; i < 16; i++) {
 144                 if (test_bit(xtab[i], rule->map)) {
 145                         res->start = res->end = xtab[i];
 146                         if (pnp_check_irq(dev, res))
 147                                 goto __add;
 148                 }
 149         }
 150         dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
 151         return 0;
 152
 153 __add:
 154         pnp_add_irq_resource(dev, res->start, res->flags);
 155         return 1;
 156 }
 157
 158 static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
 159 {
 160         struct resource *res, local_res;
 161         int i;
 162
 163         /* DMA priority: this table is good for i386 */
 164         static unsigned short xtab[8] = {
 165                 1, 3, 5, 6, 7, 0, 2, 4
 166         };
 167
 168         res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
 169         if (res) {
 170                 dev_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
 171                         idx, (int) res->start, res->flags);
 172                 return;
 173         }
 174
 175         res = &local_res;
 176         res->flags = rule->flags | IORESOURCE_AUTO;
 177         res->start = -1;
 178         res->end = -1;
 179
 180         for (i = 0; i < 8; i++) {
 181                 if (rule->map & (1 << xtab[i])) {
 182                         res->start = res->end = xtab[i];
 183                         if (pnp_check_dma(dev, res))
 184                                 goto __add;
 185                 }
 186         }
 187 #ifdef MAX_DMA_CHANNELS
 188         res->start = res->end = MAX_DMA_CHANNELS;
 189 #endif
 190         res->flags |= IORESOURCE_DISABLED;
 191         dev_dbg(&dev->dev, "  disable dma %d\n", idx);
 192
 193 __add:
 194         pnp_add_dma_resource(dev, res->start, res->flags);
 195 }
 196
 197 void pnp_init_resources(struct pnp_dev *dev)
 198 {
 199         pnp_free_resources(dev);
 200 }
 201
 202 static void pnp_clean_resource_table(struct pnp_dev *dev)
 203 {
 204         struct pnp_resource *pnp_res, *tmp;
 205
 206         list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
 207                 if (pnp_res->res.flags & IORESOURCE_AUTO)
 208                         pnp_free_resource(pnp_res);
 209         }
 210 }
 211
 212 /**
 213  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
 214  * @dev: pointer to the desired device
 215  * @depnum: the dependent function number
 216  *
 217  * Only set depnum to 0 if the device does not have dependent options.
 218  */
 219 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
 220 {
 221         struct pnp_port *port;
 222         struct pnp_mem *mem;
 223         struct pnp_irq *irq;
 224         struct pnp_dma *dma;
 225         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
 226
 227         if (!pnp_can_configure(dev))
 228                 return -ENODEV;
 229
 230         dbg_pnp_show_resources(dev, "before pnp_assign_resources");
 231         mutex_lock(&pnp_res_mutex);
 232         pnp_clean_resource_table(dev);
 233         if (dev->independent) {
 234                 dev_dbg(&dev->dev, "assigning independent options\n");
 235                 port = dev->independent->port;
 236                 mem = dev->independent->mem;
 237                 irq = dev->independent->irq;
 238                 dma = dev->independent->dma;
 239                 while (port) {
 240                         if (!pnp_assign_port(dev, port, nport))
 241                                 goto fail;
 242                         nport++;
 243                         port = port->next;
 244                 }
 245                 while (mem) {
 246                         if (!pnp_assign_mem(dev, mem, nmem))
 247                                 goto fail;
 248                         nmem++;
 249                         mem = mem->next;
 250                 }
 251                 while (irq) {
 252                         if (!pnp_assign_irq(dev, irq, nirq))
 253                                 goto fail;
 254                         nirq++;
 255                         irq = irq->next;
 256                 }
 257                 while (dma) {
 258                         pnp_assign_dma(dev, dma, ndma);
 259                         ndma++;
 260                         dma = dma->next;
 261                 }
 262         }
 263
 264         if (depnum) {
 265                 struct pnp_option *dep;
 266                 int i;
 267
 268                 dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
 269                 for (i = 1, dep = dev->dependent; i < depnum;
 270                      i++, dep = dep->next)
 271                         if (!dep)
 272                                 goto fail;
 273                 port = dep->port;
 274                 mem = dep->mem;
 275                 irq = dep->irq;
 276                 dma = dep->dma;
 277                 while (port) {
 278                         if (!pnp_assign_port(dev, port, nport))
 279                                 goto fail;
 280                         nport++;
 281                         port = port->next;
 282                 }
 283                 while (mem) {
 284                         if (!pnp_assign_mem(dev, mem, nmem))
 285                                 goto fail;
 286                         nmem++;
 287                         mem = mem->next;
 288                 }
 289                 while (irq) {
 290                         if (!pnp_assign_irq(dev, irq, nirq))
 291                                 goto fail;
 292                         nirq++;
 293                         irq = irq->next;
 294                 }
 295                 while (dma) {
 296                         pnp_assign_dma(dev, dma, ndma);
 297                         ndma++;
 298                         dma = dma->next;
 299                 }
 300         } else if (dev->dependent)
 301                 goto fail;
 302
 303         mutex_unlock(&pnp_res_mutex);
 304         dbg_pnp_show_resources(dev, "after pnp_assign_resources");
 305         return 1;
 306
 307 fail:
 308         pnp_clean_resource_table(dev);
 309         mutex_unlock(&pnp_res_mutex);
 310         dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
 311         return 0;
 312 }
 313
 314 /**
 315  * pnp_auto_config_dev - automatically assigns resources to a device
 316  * @dev: pointer to the desired device
 317  */
 318 int pnp_auto_config_dev(struct pnp_dev *dev)
 319 {
 320         struct pnp_option *dep;
 321         int i = 1;
 322
 323         if (!pnp_can_configure(dev)) {
 324                 dev_dbg(&dev->dev, "configuration not supported\n");
 325                 return -ENODEV;
 326         }
 327
 328         if (!dev->dependent) {
 329                 if (pnp_assign_resources(dev, 0))
 330                         return 0;
 331         } else {
 332                 dep = dev->dependent;
 333                 do {
 334                         if (pnp_assign_resources(dev, i))
 335                                 return 0;
 336                         dep = dep->next;
 337                         i++;
 338                 } while (dep);
 339         }
 340
 341         dev_err(&dev->dev, "unable to assign resources\n");
 342         return -EBUSY;
 343 }
 344
 345 /**
 346  * pnp_start_dev - low-level start of the PnP device
 347  * @dev: pointer to the desired device
 348  *
 349  * assumes that resources have already been allocated
 350  */
 351 int pnp_start_dev(struct pnp_dev *dev)
 352 {
 353         if (!pnp_can_write(dev)) {
 354                 dev_dbg(&dev->dev, "activation not supported\n");
 355                 return -EINVAL;
 356         }
 357
 358         dbg_pnp_show_resources(dev, "pnp_start_dev");
 359         if (dev->protocol->set(dev) < 0) {
 360                 dev_err(&dev->dev, "activation failed\n");
 361                 return -EIO;
 362         }
 363
 364         dev_info(&dev->dev, "activated\n");
 365         return 0;
 366 }
 367
 368 /**
 369  * pnp_stop_dev - low-level disable of the PnP device
 370  * @dev: pointer to the desired device
 371  *
 372  * does not free resources
 373  */
 374 int pnp_stop_dev(struct pnp_dev *dev)
 375 {
 376         if (!pnp_can_disable(dev)) {
 377                 dev_dbg(&dev->dev, "disabling not supported\n");
 378                 return -EINVAL;
 379         }
 380         if (dev->protocol->disable(dev) < 0) {
 381                 dev_err(&dev->dev, "disable failed\n");
 382                 return -EIO;
 383         }
 384
 385         dev_info(&dev->dev, "disabled\n");
 386         return 0;
 387 }
 388
 389 /**
 390  * pnp_activate_dev - activates a PnP device for use
 391  * @dev: pointer to the desired device
 392  *
 393  * does not validate or set resources so be careful.
 394  */
 395 int pnp_activate_dev(struct pnp_dev *dev)
 396 {
 397         int error;
 398
 399         if (dev->active)
 400                 return 0;
 401
 402         /* ensure resources are allocated */
 403         if (pnp_auto_config_dev(dev))
 404                 return -EBUSY;
 405
 406         error = pnp_start_dev(dev);
 407         if (error)
 408                 return error;
 409
 410         dev->active = 1;
 411         return 0;
 412 }
 413
 414 /**
 415  * pnp_disable_dev - disables device
 416  * @dev: pointer to the desired device
 417  *
 418  * inform the correct pnp protocol so that resources can be used by other devices
 419  */
 420 int pnp_disable_dev(struct pnp_dev *dev)
 421 {
 422         int error;
 423
 424         if (!dev->active)
 425                 return 0;
 426
 427         error = pnp_stop_dev(dev);
 428         if (error)
 429                 return error;
 430
 431         dev->active = 0;
 432
 433         /* release the resources so that other devices can use them */
 434         mutex_lock(&pnp_res_mutex);
 435         pnp_clean_resource_table(dev);
 436         mutex_unlock(&pnp_res_mutex);
 437
 438         return 0;
 439 }
 440
 441 EXPORT_SYMBOL(pnp_start_dev);
 442 EXPORT_SYMBOL(pnp_stop_dev);
 443 EXPORT_SYMBOL(pnp_activate_dev);
 444 EXPORT_SYMBOL(pnp_disable_dev);