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  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   7  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   8  */
   9
  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/bitmap.h>
  16 #include <linux/mutex.h>
  17 #include "base.h"
  18
  19 DEFINE_MUTEX(pnp_res_mutex);
  20
  21 static struct resource *pnp_find_resource(struct pnp_dev *dev,
  22                                           unsigned char rule,
  23                                           unsigned long type,
  24                                           unsigned int bar)
  25 {
  26         struct resource *res = pnp_get_resource(dev, type, bar);
  27
  28         /* when the resource already exists, set its resource bits from rule */
  29         if (res) {
  30                 res->flags &= ~IORESOURCE_BITS;
  31                 res->flags |= rule & IORESOURCE_BITS;
  32         }
  33
  34         return res;
  35 }
  36
  37 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
  38 {
  39         struct resource *res, local_res;
  40
  41         res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx);
  42         if (res) {
  43                 pnp_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
  44                         "flags %#lx\n", idx, (unsigned long long) res->start,
  45                         (unsigned long long) res->end, res->flags);
  46                 return 0;
  47         }
  48
  49         res = &local_res;
  50         res->flags = rule->flags | IORESOURCE_AUTO;
  51         res->start = 0;
  52         res->end = 0;
  53
  54         if (!rule->size) {
  55                 res->flags |= IORESOURCE_DISABLED;
  56                 pnp_dbg(&dev->dev, "  io %d disabled\n", idx);
  57                 goto __add;
  58         }
  59
  60         res->start = rule->min;
  61         res->end = res->start + rule->size - 1;
  62
  63         while (!pnp_check_port(dev, res)) {
  64                 res->start += rule->align;
  65                 res->end = res->start + rule->size - 1;
  66                 if (res->start > rule->max || !rule->align) {
  67                         pnp_dbg(&dev->dev, "  couldn't assign io %d "
  68                                 "(min %#llx max %#llx)\n", idx,
  69                                 (unsigned long long) rule->min,
  70                                 (unsigned long long) rule->max);
  71                         return -EBUSY;
  72                 }
  73         }
  74
  75 __add:
  76         pnp_add_io_resource(dev, res->start, res->end, res->flags);
  77         return 0;
  78 }
  79
  80 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
  81 {
  82         struct resource *res, local_res;
  83
  84         res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx);
  85         if (res) {
  86                 pnp_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
  87                         "flags %#lx\n", idx, (unsigned long long) res->start,
  88                         (unsigned long long) res->end, res->flags);
  89                 return 0;
  90         }
  91
  92         res = &local_res;
  93         res->flags = rule->flags | IORESOURCE_AUTO;
  94         res->start = 0;
  95         res->end = 0;
  96
  97         /* ??? rule->flags restricted to 8 bits, all tests bogus ??? */
  98         if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
  99                 res->flags |= IORESOURCE_READONLY;
 100         if (rule->flags & IORESOURCE_MEM_CACHEABLE)
 101                 res->flags |= IORESOURCE_CACHEABLE;
 102         if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
 103                 res->flags |= IORESOURCE_RANGELENGTH;
 104         if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
 105                 res->flags |= IORESOURCE_SHADOWABLE;
 106
 107         if (!rule->size) {
 108                 res->flags |= IORESOURCE_DISABLED;
 109                 pnp_dbg(&dev->dev, "  mem %d disabled\n", idx);
 110                 goto __add;
 111         }
 112
 113         res->start = rule->min;
 114         res->end = res->start + rule->size - 1;
 115
 116         while (!pnp_check_mem(dev, res)) {
 117                 res->start += rule->align;
 118                 res->end = res->start + rule->size - 1;
 119                 if (res->start > rule->max || !rule->align) {
 120                         pnp_dbg(&dev->dev, "  couldn't assign mem %d "
 121                                 "(min %#llx max %#llx)\n", idx,
 122                                 (unsigned long long) rule->min,
 123                                 (unsigned long long) rule->max);
 124                         return -EBUSY;
 125                 }
 126         }
 127
 128 __add:
 129         pnp_add_mem_resource(dev, res->start, res->end, res->flags);
 130         return 0;
 131 }
 132
 133 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
 134 {
 135         struct resource *res, local_res;
 136         int i;
 137
 138         /* IRQ priority: this table is good for i386 */
 139         static unsigned short xtab[16] = {
 140                 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
 141         };
 142
 143         res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx);
 144         if (res) {
 145                 pnp_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
 146                         idx, (int) res->start, res->flags);
 147                 return 0;
 148         }
 149
 150         res = &local_res;
 151         res->flags = rule->flags | IORESOURCE_AUTO;
 152         res->start = -1;
 153         res->end = -1;
 154
 155         if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
 156                 res->flags |= IORESOURCE_DISABLED;
 157                 pnp_dbg(&dev->dev, "  irq %d disabled\n", idx);
 158                 goto __add;
 159         }
 160
 161         /* TBD: need check for >16 IRQ */
 162         res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
 163         if (res->start < PNP_IRQ_NR) {
 164                 res->end = res->start;
 165                 goto __add;
 166         }
 167         for (i = 0; i < 16; i++) {
 168                 if (test_bit(xtab[i], rule->map.bits)) {
 169                         res->start = res->end = xtab[i];
 170                         if (pnp_check_irq(dev, res))
 171                                 goto __add;
 172                 }
 173         }
 174
 175         if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
 176                 res->start = -1;
 177                 res->end = -1;
 178                 res->flags |= IORESOURCE_DISABLED;
 179                 pnp_dbg(&dev->dev, "  irq %d disabled (optional)\n", idx);
 180                 goto __add;
 181         }
 182
 183         pnp_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
 184         return -EBUSY;
 185
 186 __add:
 187         pnp_add_irq_resource(dev, res->start, res->flags);
 188         return 0;
 189 }
 190
 191 #ifdef CONFIG_ISA_DMA_API
 192 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
 193 {
 194         struct resource *res, local_res;
 195         int i;
 196
 197         /* DMA priority: this table is good for i386 */
 198         static unsigned short xtab[8] = {
 199                 1, 3, 5, 6, 7, 0, 2, 4
 200         };
 201
 202         res = pnp_find_resource(dev, rule->flags, IORESOURCE_DMA, idx);
 203         if (res) {
 204                 pnp_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
 205                         idx, (int) res->start, res->flags);
 206                 return 0;
 207         }
 208
 209         res = &local_res;
 210         res->flags = rule->flags | IORESOURCE_AUTO;
 211         res->start = -1;
 212         res->end = -1;
 213
 214         for (i = 0; i < 8; i++) {
 215                 if (rule->map & (1 << xtab[i])) {
 216                         res->start = res->end = xtab[i];
 217                         if (pnp_check_dma(dev, res))
 218                                 goto __add;
 219                 }
 220         }
 221 #ifdef MAX_DMA_CHANNELS
 222         res->start = res->end = MAX_DMA_CHANNELS;
 223 #endif
 224         res->flags |= IORESOURCE_DISABLED;
 225         pnp_dbg(&dev->dev, "  disable dma %d\n", idx);
 226
 227 __add:
 228         pnp_add_dma_resource(dev, res->start, res->flags);
 229         return 0;
 230 }
 231 #endif /* CONFIG_ISA_DMA_API */
 232
 233 void pnp_init_resources(struct pnp_dev *dev)
 234 {
 235         pnp_free_resources(dev);
 236 }
 237
 238 static void pnp_clean_resource_table(struct pnp_dev *dev)
 239 {
 240         struct pnp_resource *pnp_res, *tmp;
 241
 242         list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
 243                 if (pnp_res->res.flags & IORESOURCE_AUTO)
 244                         pnp_free_resource(pnp_res);
 245         }
 246 }
 247
 248 /**
 249  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
 250  * @dev: pointer to the desired device
 251  * @set: the dependent function number
 252  */
 253 static int pnp_assign_resources(struct pnp_dev *dev, int set)
 254 {
 255         struct pnp_option *option;
 256         int nport = 0, nmem = 0, nirq = 0;
 257         int ndma __maybe_unused = 0;
 258         int ret = 0;
 259
 260         pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
 261         mutex_lock(&pnp_res_mutex);
 262         pnp_clean_resource_table(dev);
 263
 264         list_for_each_entry(option, &dev->options, list) {
 265                 if (pnp_option_is_dependent(option) &&
 266                     pnp_option_set(option) != set)
 267                                 continue;
 268
 269                 switch (option->type) {
 270                 case IORESOURCE_IO:
 271                         ret = pnp_assign_port(dev, &option->u.port, nport++);
 272                         break;
 273                 case IORESOURCE_MEM:
 274                         ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
 275                         break;
 276                 case IORESOURCE_IRQ:
 277                         ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
 278                         break;
 279 #ifdef CONFIG_ISA_DMA_API
 280                 case IORESOURCE_DMA:
 281                         ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
 282                         break;
 283 #endif
 284                 default:
 285                         ret = -EINVAL;
 286                         break;
 287                 }
 288                 if (ret < 0)
 289                         break;
 290         }
 291
 292         mutex_unlock(&pnp_res_mutex);
 293         if (ret < 0) {
 294                 pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
 295                 pnp_clean_resource_table(dev);
 296         } else
 297                 dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
 298         return ret;
 299 }
 300
 301 /**
 302  * pnp_auto_config_dev - automatically assigns resources to a device
 303  * @dev: pointer to the desired device
 304  */
 305 int pnp_auto_config_dev(struct pnp_dev *dev)
 306 {
 307         int i, ret;
 308
 309         if (!pnp_can_configure(dev)) {
 310                 pnp_dbg(&dev->dev, "configuration not supported\n");
 311                 return -ENODEV;
 312         }
 313
 314         ret = pnp_assign_resources(dev, 0);
 315         if (ret == 0)
 316                 return 0;
 317
 318         for (i = 1; i < dev->num_dependent_sets; i++) {
 319                 ret = pnp_assign_resources(dev, i);
 320                 if (ret == 0)
 321                         return 0;
 322         }
 323
 324         dev_err(&dev->dev, "unable to assign resources\n");
 325         return ret;
 326 }
 327
 328 /**
 329  * pnp_start_dev - low-level start of the PnP device
 330  * @dev: pointer to the desired device
 331  *
 332  * assumes that resources have already been allocated
 333  */
 334 int pnp_start_dev(struct pnp_dev *dev)
 335 {
 336         if (!pnp_can_write(dev)) {
 337                 pnp_dbg(&dev->dev, "activation not supported\n");
 338                 return -EINVAL;
 339         }
 340
 341         dbg_pnp_show_resources(dev, "pnp_start_dev");
 342         if (dev->protocol->set(dev) < 0) {
 343                 dev_err(&dev->dev, "activation failed\n");
 344                 return -EIO;
 345         }
 346
 347         dev_info(&dev->dev, "activated\n");
 348         return 0;
 349 }
 350
 351 /**
 352  * pnp_stop_dev - low-level disable of the PnP device
 353  * @dev: pointer to the desired device
 354  *
 355  * does not free resources
 356  */
 357 int pnp_stop_dev(struct pnp_dev *dev)
 358 {
 359         if (!pnp_can_disable(dev)) {
 360                 pnp_dbg(&dev->dev, "disabling not supported\n");
 361                 return -EINVAL;
 362         }
 363         if (dev->protocol->disable(dev) < 0) {
 364                 dev_err(&dev->dev, "disable failed\n");
 365                 return -EIO;
 366         }
 367
 368         dev_info(&dev->dev, "disabled\n");
 369         return 0;
 370 }
 371
 372 /**
 373  * pnp_activate_dev - activates a PnP device for use
 374  * @dev: pointer to the desired device
 375  *
 376  * does not validate or set resources so be careful.
 377  */
 378 int pnp_activate_dev(struct pnp_dev *dev)
 379 {
 380         int error;
 381
 382         if (dev->active)
 383                 return 0;
 384
 385         /* ensure resources are allocated */
 386         if (pnp_auto_config_dev(dev))
 387                 return -EBUSY;
 388
 389         error = pnp_start_dev(dev);
 390         if (error)
 391                 return error;
 392
 393         dev->active = 1;
 394         return 0;
 395 }
 396
 397 /**
 398  * pnp_disable_dev - disables device
 399  * @dev: pointer to the desired device
 400  *
 401  * inform the correct pnp protocol so that resources can be used by other devices
 402  */
 403 int pnp_disable_dev(struct pnp_dev *dev)
 404 {
 405         int error;
 406
 407         if (!dev->active)
 408                 return 0;
 409
 410         error = pnp_stop_dev(dev);
 411         if (error)
 412                 return error;
 413
 414         dev->active = 0;
 415
 416         /* release the resources so that other devices can use them */
 417         mutex_lock(&pnp_res_mutex);
 418         pnp_clean_resource_table(dev);
 419         mutex_unlock(&pnp_res_mutex);
 420
 421         return 0;
 422 }
 423
 424 EXPORT_SYMBOL(pnp_start_dev);
 425 EXPORT_SYMBOL(pnp_stop_dev);
 426 EXPORT_SYMBOL(pnp_activate_dev);
 427 EXPORT_SYMBOL(pnp_disable_dev);