kernel/irq/irqdomain.c

   1 #define pr_fmt(fmt)  "irq: " fmt
   2
   3 #include <linux/debugfs.h>
   4 #include <linux/hardirq.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/irq.h>
   7 #include <linux/irqdesc.h>
   8 #include <linux/irqdomain.h>
   9 #include <linux/module.h>
  10 #include <linux/mutex.h>
  11 #include <linux/of.h>
  12 #include <linux/of_address.h>
  13 #include <linux/topology.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/slab.h>
  16 #include <linux/smp.h>
  17 #include <linux/fs.h>
  18
  19 #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
  20                                  * ie. legacy 8259, gets irqs 1..15 */
  21 #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
  22 #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
  23 #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
  24
  25 static LIST_HEAD(irq_domain_list);
  26 static DEFINE_MUTEX(irq_domain_mutex);
  27
  28 static DEFINE_MUTEX(revmap_trees_mutex);
  29 static struct irq_domain *irq_default_domain;
  30
  31 /**
  32  * irq_domain_alloc() - Allocate a new irq_domain data structure
  33  * @of_node: optional device-tree node of the interrupt controller
  34  * @revmap_type: type of reverse mapping to use
  35  * @ops: map/unmap domain callbacks
  36  * @host_data: Controller private data pointer
  37  *
  38  * Allocates and initialize and irq_domain structure.  Caller is expected to
  39  * register allocated irq_domain with irq_domain_register().  Returns pointer
  40  * to IRQ domain, or NULL on failure.
  41  */
  42 static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
  43                                            unsigned int revmap_type,
  44                                            const struct irq_domain_ops *ops,
  45                                            void *host_data)
  46 {
  47         struct irq_domain *domain;
  48
  49         domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
  50                               of_node_to_nid(of_node));
  51         if (WARN_ON(!domain))
  52                 return NULL;
  53
  54         /* Fill structure */
  55         domain->revmap_type = revmap_type;
  56         domain->ops = ops;
  57         domain->host_data = host_data;
  58         domain->of_node = of_node_get(of_node);
  59
  60         return domain;
  61 }
  62
  63 static void irq_domain_free(struct irq_domain *domain)
  64 {
  65         of_node_put(domain->of_node);
  66         kfree(domain);
  67 }
  68
  69 static void irq_domain_add(struct irq_domain *domain)
  70 {
  71         mutex_lock(&irq_domain_mutex);
  72         list_add(&domain->link, &irq_domain_list);
  73         mutex_unlock(&irq_domain_mutex);
  74         pr_debug("Allocated domain of type %d @0x%p\n",
  75                  domain->revmap_type, domain);
  76 }
  77
  78 /**
  79  * irq_domain_remove() - Remove an irq domain.
  80  * @domain: domain to remove
  81  *
  82  * This routine is used to remove an irq domain. The caller must ensure
  83  * that all mappings within the domain have been disposed of prior to
  84  * use, depending on the revmap type.
  85  */
  86 void irq_domain_remove(struct irq_domain *domain)
  87 {
  88         mutex_lock(&irq_domain_mutex);
  89
  90         switch (domain->revmap_type) {
  91         case IRQ_DOMAIN_MAP_LEGACY:
  92                 /*
  93                  * Legacy domains don't manage their own irq_desc
  94                  * allocations, we expect the caller to handle irq_desc
  95                  * freeing on their own.
  96                  */
  97                 break;
  98         case IRQ_DOMAIN_MAP_TREE:
  99                 /*
 100                  * radix_tree_delete() takes care of destroying the root
 101                  * node when all entries are removed. Shout if there are
 102                  * any mappings left.
 103                  */
 104                 WARN_ON(domain->revmap_data.tree.height);
 105                 break;
 106         case IRQ_DOMAIN_MAP_LINEAR:
 107                 kfree(domain->revmap_data.linear.revmap);
 108                 domain->revmap_data.linear.size = 0;
 109                 break;
 110         case IRQ_DOMAIN_MAP_NOMAP:
 111                 break;
 112         }
 113
 114         list_del(&domain->link);
 115
 116         /*
 117          * If the going away domain is the default one, reset it.
 118          */
 119         if (unlikely(irq_default_domain == domain))
 120                 irq_set_default_host(NULL);
 121
 122         mutex_unlock(&irq_domain_mutex);
 123
 124         pr_debug("Removed domain of type %d @0x%p\n",
 125                  domain->revmap_type, domain);
 126
 127         irq_domain_free(domain);
 128 }
 129 EXPORT_SYMBOL_GPL(irq_domain_remove);
 130
 131 static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
 132                                              irq_hw_number_t hwirq)
 133 {
 134         irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
 135         int size = domain->revmap_data.legacy.size;
 136
 137         if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
 138                 return 0;
 139         return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
 140 }
 141
 142 /**
 143  * irq_domain_add_simple() - Allocate and register a simple irq_domain.
 144  * @of_node: pointer to interrupt controller's device tree node.
 145  * @size: total number of irqs in mapping
 146  * @first_irq: first number of irq block assigned to the domain
 147  * @ops: map/unmap domain callbacks
 148  * @host_data: Controller private data pointer
 149  *
 150  * Allocates a legacy irq_domain if irq_base is positive or a linear
 151  * domain otherwise.
 152  *
 153  * This is intended to implement the expected behaviour for most
 154  * interrupt controllers which is that a linear mapping should
 155  * normally be used unless the system requires a legacy mapping in
 156  * order to support supplying interrupt numbers during non-DT
 157  * registration of devices.
 158  */
 159 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
 160                                          unsigned int size,
 161                                          unsigned int first_irq,
 162                                          const struct irq_domain_ops *ops,
 163                                          void *host_data)
 164 {
 165         if (first_irq > 0)
 166                 return irq_domain_add_legacy(of_node, size, first_irq, 0,
 167                                              ops, host_data);
 168         else
 169                 return irq_domain_add_linear(of_node, size, ops, host_data);
 170 }
 171
 172 /**
 173  * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
 174  * @of_node: pointer to interrupt controller's device tree node.
 175  * @size: total number of irqs in legacy mapping
 176  * @first_irq: first number of irq block assigned to the domain
 177  * @first_hwirq: first hwirq number to use for the translation. Should normally
 178  *               be '0', but a positive integer can be used if the effective
 179  *               hwirqs numbering does not begin at zero.
 180  * @ops: map/unmap domain callbacks
 181  * @host_data: Controller private data pointer
 182  *
 183  * Note: the map() callback will be called before this function returns
 184  * for all legacy interrupts except 0 (which is always the invalid irq for
 185  * a legacy controller).
 186  */
 187 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 188                                          unsigned int size,
 189                                          unsigned int first_irq,
 190                                          irq_hw_number_t first_hwirq,
 191                                          const struct irq_domain_ops *ops,
 192                                          void *host_data)
 193 {
 194         struct irq_domain *domain;
 195         unsigned int i;
 196
 197         domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
 198         if (!domain)
 199                 return NULL;
 200
 201         domain->revmap_data.legacy.first_irq = first_irq;
 202         domain->revmap_data.legacy.first_hwirq = first_hwirq;
 203         domain->revmap_data.legacy.size = size;
 204
 205         mutex_lock(&irq_domain_mutex);
 206         /* Verify that all the irqs are available */
 207         for (i = 0; i < size; i++) {
 208                 int irq = first_irq + i;
 209                 struct irq_data *irq_data = irq_get_irq_data(irq);
 210
 211                 if (WARN_ON(!irq_data || irq_data->domain)) {
 212                         mutex_unlock(&irq_domain_mutex);
 213                         irq_domain_free(domain);
 214                         return NULL;
 215                 }
 216         }
 217
 218         /* Claim all of the irqs before registering a legacy domain */
 219         for (i = 0; i < size; i++) {
 220                 struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
 221                 irq_data->hwirq = first_hwirq + i;
 222                 irq_data->domain = domain;
 223         }
 224         mutex_unlock(&irq_domain_mutex);
 225
 226         for (i = 0; i < size; i++) {
 227                 int irq = first_irq + i;
 228                 int hwirq = first_hwirq + i;
 229
 230                 /* IRQ0 gets ignored */
 231                 if (!irq)
 232                         continue;
 233
 234                 /* Legacy flags are left to default at this point,
 235                  * one can then use irq_create_mapping() to
 236                  * explicitly change them
 237                  */
 238                 if (ops->map)
 239                         ops->map(domain, irq, hwirq);
 240
 241                 /* Clear norequest flags */
 242                 irq_clear_status_flags(irq, IRQ_NOREQUEST);
 243         }
 244
 245         irq_domain_add(domain);
 246         return domain;
 247 }
 248 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 249
 250 /**
 251  * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
 252  * @of_node: pointer to interrupt controller's device tree node.
 253  * @size: Number of interrupts in the domain.
 254  * @ops: map/unmap domain callbacks
 255  * @host_data: Controller private data pointer
 256  */
 257 struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
 258                                          unsigned int size,
 259                                          const struct irq_domain_ops *ops,
 260                                          void *host_data)
 261 {
 262         struct irq_domain *domain;
 263         unsigned int *revmap;
 264
 265         revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
 266                               of_node_to_nid(of_node));
 267         if (WARN_ON(!revmap))
 268                 return NULL;
 269
 270         domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
 271         if (!domain) {
 272                 kfree(revmap);
 273                 return NULL;
 274         }
 275         domain->revmap_data.linear.size = size;
 276         domain->revmap_data.linear.revmap = revmap;
 277         irq_domain_add(domain);
 278         return domain;
 279 }
 280 EXPORT_SYMBOL_GPL(irq_domain_add_linear);
 281
 282 struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 283                                          unsigned int max_irq,
 284                                          const struct irq_domain_ops *ops,
 285                                          void *host_data)
 286 {
 287         struct irq_domain *domain = irq_domain_alloc(of_node,
 288                                         IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
 289         if (domain) {
 290                 domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
 291                 irq_domain_add(domain);
 292         }
 293         return domain;
 294 }
 295 EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
 296
 297 /**
 298  * irq_domain_add_tree()
 299  * @of_node: pointer to interrupt controller's device tree node.
 300  * @ops: map/unmap domain callbacks
 301  *
 302  * Note: The radix tree will be allocated later during boot automatically
 303  * (the reverse mapping will use the slow path until that happens).
 304  */
 305 struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
 306                                          const struct irq_domain_ops *ops,
 307                                          void *host_data)
 308 {
 309         struct irq_domain *domain = irq_domain_alloc(of_node,
 310                                         IRQ_DOMAIN_MAP_TREE, ops, host_data);
 311         if (domain) {
 312                 INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
 313                 irq_domain_add(domain);
 314         }
 315         return domain;
 316 }
 317 EXPORT_SYMBOL_GPL(irq_domain_add_tree);
 318
 319 /**
 320  * irq_find_host() - Locates a domain for a given device node
 321  * @node: device-tree node of the interrupt controller
 322  */
 323 struct irq_domain *irq_find_host(struct device_node *node)
 324 {
 325         struct irq_domain *h, *found = NULL;
 326         int rc;
 327
 328         /* We might want to match the legacy controller last since
 329          * it might potentially be set to match all interrupts in
 330          * the absence of a device node. This isn't a problem so far
 331          * yet though...
 332          */
 333         mutex_lock(&irq_domain_mutex);
 334         list_for_each_entry(h, &irq_domain_list, link) {
 335                 if (h->ops->match)
 336                         rc = h->ops->match(h, node);
 337                 else
 338                         rc = (h->of_node != NULL) && (h->of_node == node);
 339
 340                 if (rc) {
 341                         found = h;
 342                         break;
 343                 }
 344         }
 345         mutex_unlock(&irq_domain_mutex);
 346         return found;
 347 }
 348 EXPORT_SYMBOL_GPL(irq_find_host);
 349
 350 /**
 351  * irq_set_default_host() - Set a "default" irq domain
 352  * @domain: default domain pointer
 353  *
 354  * For convenience, it's possible to set a "default" domain that will be used
 355  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 356  * platforms that want to manipulate a few hard coded interrupt numbers that
 357  * aren't properly represented in the device-tree.
 358  */
 359 void irq_set_default_host(struct irq_domain *domain)
 360 {
 361         pr_debug("Default domain set to @0x%p\n", domain);
 362
 363         irq_default_domain = domain;
 364 }
 365 EXPORT_SYMBOL_GPL(irq_set_default_host);
 366
 367 static void irq_domain_disassociate_many(struct irq_domain *domain,
 368                                          unsigned int irq_base, int count)
 369 {
 370         /*
 371          * disassociate in reverse order;
 372          * not strictly necessary, but nice for unwinding
 373          */
 374         while (count--) {
 375                 int irq = irq_base + count;
 376                 struct irq_data *irq_data = irq_get_irq_data(irq);
 377                 irq_hw_number_t hwirq = irq_data->hwirq;
 378
 379                 if (WARN_ON(!irq_data || irq_data->domain != domain))
 380                         continue;
 381
 382                 irq_set_status_flags(irq, IRQ_NOREQUEST);
 383
 384                 /* remove chip and handler */
 385                 irq_set_chip_and_handler(irq, NULL, NULL);
 386
 387                 /* Make sure it's completed */
 388                 synchronize_irq(irq);
 389
 390                 /* Tell the PIC about it */
 391                 if (domain->ops->unmap)
 392                         domain->ops->unmap(domain, irq);
 393                 smp_mb();
 394
 395                 irq_data->domain = NULL;
 396                 irq_data->hwirq = 0;
 397
 398                 /* Clear reverse map */
 399                 switch(domain->revmap_type) {
 400                 case IRQ_DOMAIN_MAP_LINEAR:
 401                         if (hwirq < domain->revmap_data.linear.size)
 402                                 domain->revmap_data.linear.revmap[hwirq] = 0;
 403                         break;
 404                 case IRQ_DOMAIN_MAP_TREE:
 405                         mutex_lock(&revmap_trees_mutex);
 406                         radix_tree_delete(&domain->revmap_data.tree, hwirq);
 407                         mutex_unlock(&revmap_trees_mutex);
 408                         break;
 409                 }
 410         }
 411 }
 412
 413 int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 414                               irq_hw_number_t hwirq_base, int count)
 415 {
 416         unsigned int virq = irq_base;
 417         irq_hw_number_t hwirq = hwirq_base;
 418         int i, ret;
 419
 420         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 421                 of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
 422
 423         for (i = 0; i < count; i++) {
 424                 struct irq_data *irq_data = irq_get_irq_data(virq + i);
 425
 426                 if (WARN(!irq_data, "error: irq_desc not allocated; "
 427                          "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
 428                         return -EINVAL;
 429                 if (WARN(irq_data->domain, "error: irq_desc already associated; "
 430                          "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
 431                         return -EINVAL;
 432         };
 433
 434         for (i = 0; i < count; i++, virq++, hwirq++) {
 435                 struct irq_data *irq_data = irq_get_irq_data(virq);
 436
 437                 irq_data->hwirq = hwirq;
 438                 irq_data->domain = domain;
 439                 if (domain->ops->map) {
 440                         ret = domain->ops->map(domain, virq, hwirq);
 441                         if (ret != 0) {
 442                                 pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
 443                                        virq, hwirq, ret);
 444                                 WARN_ON(1);
 445                                 irq_data->domain = NULL;
 446                                 irq_data->hwirq = 0;
 447                                 goto err_unmap;
 448                         }
 449                 }
 450
 451                 switch (domain->revmap_type) {
 452                 case IRQ_DOMAIN_MAP_LINEAR:
 453                         if (hwirq < domain->revmap_data.linear.size)
 454                                 domain->revmap_data.linear.revmap[hwirq] = virq;
 455                         break;
 456                 case IRQ_DOMAIN_MAP_TREE:
 457                         mutex_lock(&revmap_trees_mutex);
 458                         radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
 459                         mutex_unlock(&revmap_trees_mutex);
 460                         break;
 461                 }
 462
 463                 irq_clear_status_flags(virq, IRQ_NOREQUEST);
 464         }
 465
 466         return 0;
 467
 468  err_unmap:
 469         irq_domain_disassociate_many(domain, irq_base, i);
 470         return -EINVAL;
 471 }
 472 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 473
 474 /**
 475  * irq_create_direct_mapping() - Allocate an irq for direct mapping
 476  * @domain: domain to allocate the irq for or NULL for default domain
 477  *
 478  * This routine is used for irq controllers which can choose the hardware
 479  * interrupt numbers they generate. In such a case it's simplest to use
 480  * the linux irq as the hardware interrupt number.
 481  */
 482 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 483 {
 484         unsigned int virq;
 485
 486         if (domain == NULL)
 487                 domain = irq_default_domain;
 488
 489         if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
 490                 return 0;
 491
 492         virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 493         if (!virq) {
 494                 pr_debug("create_direct virq allocation failed\n");
 495                 return 0;
 496         }
 497         if (virq >= domain->revmap_data.nomap.max_irq) {
 498                 pr_err("ERROR: no free irqs available below %i maximum\n",
 499                         domain->revmap_data.nomap.max_irq);
 500                 irq_free_desc(virq);
 501                 return 0;
 502         }
 503         pr_debug("create_direct obtained virq %d\n", virq);
 504
 505         if (irq_domain_associate(domain, virq, virq)) {
 506                 irq_free_desc(virq);
 507                 return 0;
 508         }
 509
 510         return virq;
 511 }
 512 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 513
 514 /**
 515  * irq_create_mapping() - Map a hardware interrupt into linux irq space
 516  * @domain: domain owning this hardware interrupt or NULL for default domain
 517  * @hwirq: hardware irq number in that domain space
 518  *
 519  * Only one mapping per hardware interrupt is permitted. Returns a linux
 520  * irq number.
 521  * If the sense/trigger is to be specified, set_irq_type() should be called
 522  * on the number returned from that call.
 523  */
 524 unsigned int irq_create_mapping(struct irq_domain *domain,
 525                                 irq_hw_number_t hwirq)
 526 {
 527         unsigned int hint;
 528         int virq;
 529
 530         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 531
 532         /* Look for default domain if nececssary */
 533         if (domain == NULL)
 534                 domain = irq_default_domain;
 535         if (domain == NULL) {
 536                 pr_warning("irq_create_mapping called for"
 537                            " NULL domain, hwirq=%lx\n", hwirq);
 538                 WARN_ON(1);
 539                 return 0;
 540         }
 541         pr_debug("-> using domain @%p\n", domain);
 542
 543         /* Check if mapping already exists */
 544         virq = irq_find_mapping(domain, hwirq);
 545         if (virq) {
 546                 pr_debug("-> existing mapping on virq %d\n", virq);
 547                 return virq;
 548         }
 549
 550         /* Get a virtual interrupt number */
 551         if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
 552                 return irq_domain_legacy_revmap(domain, hwirq);
 553
 554         /* Allocate a virtual interrupt number */
 555         hint = hwirq % nr_irqs;
 556         if (hint == 0)
 557                 hint++;
 558         virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
 559         if (virq <= 0)
 560                 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 561         if (virq <= 0) {
 562                 pr_debug("-> virq allocation failed\n");
 563                 return 0;
 564         }
 565
 566         if (irq_domain_associate(domain, virq, hwirq)) {
 567                 irq_free_desc(virq);
 568                 return 0;
 569         }
 570
 571         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 572                 hwirq, of_node_full_name(domain->of_node), virq);
 573
 574         return virq;
 575 }
 576 EXPORT_SYMBOL_GPL(irq_create_mapping);
 577
 578 /**
 579  * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
 580  * @domain: domain owning the interrupt range
 581  * @irq_base: beginning of linux IRQ range
 582  * @hwirq_base: beginning of hardware IRQ range
 583  * @count: Number of interrupts to map
 584  *
 585  * This routine is used for allocating and mapping a range of hardware
 586  * irqs to linux irqs where the linux irq numbers are at pre-defined
 587  * locations. For use by controllers that already have static mappings
 588  * to insert in to the domain.
 589  *
 590  * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
 591  * domain insertion.
 592  *
 593  * 0 is returned upon success, while any failure to establish a static
 594  * mapping is treated as an error.
 595  */
 596 int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
 597                                irq_hw_number_t hwirq_base, int count)
 598 {
 599         int ret;
 600
 601         ret = irq_alloc_descs(irq_base, irq_base, count,
 602                               of_node_to_nid(domain->of_node));
 603         if (unlikely(ret < 0))
 604                 return ret;
 605
 606         ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count);
 607         if (unlikely(ret < 0)) {
 608                 irq_free_descs(irq_base, count);
 609                 return ret;
 610         }
 611
 612         return 0;
 613 }
 614 EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
 615
 616 unsigned int irq_create_of_mapping(struct device_node *controller,
 617                                    const u32 *intspec, unsigned int intsize)
 618 {
 619         struct irq_domain *domain;
 620         irq_hw_number_t hwirq;
 621         unsigned int type = IRQ_TYPE_NONE;
 622         unsigned int virq;
 623
 624         domain = controller ? irq_find_host(controller) : irq_default_domain;
 625         if (!domain) {
 626 #ifdef CONFIG_MIPS
 627                 /*
 628                  * Workaround to avoid breaking interrupt controller drivers
 629                  * that don't yet register an irq_domain.  This is temporary
 630                  * code. ~~~gcl, Feb 24, 2012
 631                  *
 632                  * Scheduled for removal in Linux v3.6.  That should be enough
 633                  * time.
 634                  */
 635                 if (intsize > 0)
 636                         return intspec[0];
 637 #endif
 638                 pr_warning("no irq domain found for %s !\n",
 639                            of_node_full_name(controller));
 640                 return 0;
 641         }
 642
 643         /* If domain has no translation, then we assume interrupt line */
 644         if (domain->ops->xlate == NULL)
 645                 hwirq = intspec[0];
 646         else {
 647                 if (domain->ops->xlate(domain, controller, intspec, intsize,
 648                                      &hwirq, &type))
 649                         return 0;
 650         }
 651
 652         /* Create mapping */
 653         virq = irq_create_mapping(domain, hwirq);
 654         if (!virq)
 655                 return virq;
 656
 657         /* Set type if specified and different than the current one */
 658         if (type != IRQ_TYPE_NONE &&
 659             type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
 660                 irq_set_irq_type(virq, type);
 661         return virq;
 662 }
 663 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 664
 665 /**
 666  * irq_dispose_mapping() - Unmap an interrupt
 667  * @virq: linux irq number of the interrupt to unmap
 668  */
 669 void irq_dispose_mapping(unsigned int virq)
 670 {
 671         struct irq_data *irq_data = irq_get_irq_data(virq);
 672         struct irq_domain *domain;
 673
 674         if (!virq || !irq_data)
 675                 return;
 676
 677         domain = irq_data->domain;
 678         if (WARN_ON(domain == NULL))
 679                 return;
 680
 681         /* Never unmap legacy interrupts */
 682         if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
 683                 return;
 684
 685         irq_domain_disassociate_many(domain, virq, 1);
 686         irq_free_desc(virq);
 687 }
 688 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 689
 690 /**
 691  * irq_find_mapping() - Find a linux irq from an hw irq number.
 692  * @domain: domain owning this hardware interrupt
 693  * @hwirq: hardware irq number in that domain space
 694  */
 695 unsigned int irq_find_mapping(struct irq_domain *domain,
 696                               irq_hw_number_t hwirq)
 697 {
 698         struct irq_data *data;
 699
 700         /* Look for default domain if nececssary */
 701         if (domain == NULL)
 702                 domain = irq_default_domain;
 703         if (domain == NULL)
 704                 return 0;
 705
 706         switch (domain->revmap_type) {
 707         case IRQ_DOMAIN_MAP_LEGACY:
 708                 return irq_domain_legacy_revmap(domain, hwirq);
 709         case IRQ_DOMAIN_MAP_LINEAR:
 710                 return irq_linear_revmap(domain, hwirq);
 711         case IRQ_DOMAIN_MAP_TREE:
 712                 rcu_read_lock();
 713                 data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
 714                 rcu_read_unlock();
 715                 if (data)
 716                         return data->irq;
 717                 break;
 718         case IRQ_DOMAIN_MAP_NOMAP:
 719                 data = irq_get_irq_data(hwirq);
 720                 if (data && (data->domain == domain) && (data->hwirq == hwirq))
 721                         return hwirq;
 722                 break;
 723         }
 724
 725         return 0;
 726 }
 727 EXPORT_SYMBOL_GPL(irq_find_mapping);
 728
 729 /**
 730  * irq_linear_revmap() - Find a linux irq from a hw irq number.
 731  * @domain: domain owning this hardware interrupt
 732  * @hwirq: hardware irq number in that domain space
 733  *
 734  * This is a fast path that can be called directly by irq controller code to
 735  * save a handful of instructions.
 736  */
 737 unsigned int irq_linear_revmap(struct irq_domain *domain,
 738                                irq_hw_number_t hwirq)
 739 {
 740         BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR);
 741
 742         /* Check revmap bounds; complain if exceeded */
 743         if (WARN_ON(hwirq >= domain->revmap_data.linear.size))
 744                 return 0;
 745
 746         return domain->revmap_data.linear.revmap[hwirq];
 747 }
 748 EXPORT_SYMBOL_GPL(irq_linear_revmap);
 749
 750 #ifdef CONFIG_IRQ_DOMAIN_DEBUG
 751 static int virq_debug_show(struct seq_file *m, void *private)
 752 {
 753         unsigned long flags;
 754         struct irq_desc *desc;
 755         const char *p;
 756         static const char none[] = "none";
 757         void *data;
 758         int i;
 759
 760         seq_printf(m, "%-5s  %-7s  %-15s  %-*s  %s\n", "irq", "hwirq",
 761                       "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
 762                       "domain name");
 763
 764         for (i = 1; i < nr_irqs; i++) {
 765                 desc = irq_to_desc(i);
 766                 if (!desc)
 767                         continue;
 768
 769                 raw_spin_lock_irqsave(&desc->lock, flags);
 770
 771                 if (desc->action && desc->action->handler) {
 772                         struct irq_chip *chip;
 773
 774                         seq_printf(m, "%5d  ", i);
 775                         seq_printf(m, "0x%05lx  ", desc->irq_data.hwirq);
 776
 777                         chip = irq_desc_get_chip(desc);
 778                         if (chip && chip->name)
 779                                 p = chip->name;
 780                         else
 781                                 p = none;
 782                         seq_printf(m, "%-15s  ", p);
 783
 784                         data = irq_desc_get_chip_data(desc);
 785                         seq_printf(m, data ? "0x%p  " : "  %p  ", data);
 786
 787                         if (desc->irq_data.domain)
 788                                 p = of_node_full_name(desc->irq_data.domain->of_node);
 789                         else
 790                                 p = none;
 791                         seq_printf(m, "%s\n", p);
 792                 }
 793
 794                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 795         }
 796
 797         return 0;
 798 }
 799
 800 static int virq_debug_open(struct inode *inode, struct file *file)
 801 {
 802         return single_open(file, virq_debug_show, inode->i_private);
 803 }
 804
 805 static const struct file_operations virq_debug_fops = {
 806         .open = virq_debug_open,
 807         .read = seq_read,
 808         .llseek = seq_lseek,
 809         .release = single_release,
 810 };
 811
 812 static int __init irq_debugfs_init(void)
 813 {
 814         if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
 815                                  NULL, &virq_debug_fops) == NULL)
 816                 return -ENOMEM;
 817
 818         return 0;
 819 }
 820 __initcall(irq_debugfs_init);
 821 #endif /* CONFIG_IRQ_DOMAIN_DEBUG */
 822
 823 /**
 824  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 825  *
 826  * Device Tree IRQ specifier translation function which works with one cell
 827  * bindings where the cell value maps directly to the hwirq number.
 828  */
 829 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 830                              const u32 *intspec, unsigned int intsize,
 831                              unsigned long *out_hwirq, unsigned int *out_type)
 832 {
 833         if (WARN_ON(intsize < 1))
 834                 return -EINVAL;
 835         *out_hwirq = intspec[0];
 836         *out_type = IRQ_TYPE_NONE;
 837         return 0;
 838 }
 839 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 840
 841 /**
 842  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
 843  *
 844  * Device Tree IRQ specifier translation function which works with two cell
 845  * bindings where the cell values map directly to the hwirq number
 846  * and linux irq flags.
 847  */
 848 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
 849                         const u32 *intspec, unsigned int intsize,
 850                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
 851 {
 852         if (WARN_ON(intsize < 2))
 853                 return -EINVAL;
 854         *out_hwirq = intspec[0];
 855         *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
 856         return 0;
 857 }
 858 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
 859
 860 /**
 861  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
 862  *
 863  * Device Tree IRQ specifier translation function which works with either one
 864  * or two cell bindings where the cell values map directly to the hwirq number
 865  * and linux irq flags.
 866  *
 867  * Note: don't use this function unless your interrupt controller explicitly
 868  * supports both one and two cell bindings.  For the majority of controllers
 869  * the _onecell() or _twocell() variants above should be used.
 870  */
 871 int irq_domain_xlate_onetwocell(struct irq_domain *d,
 872                                 struct device_node *ctrlr,
 873                                 const u32 *intspec, unsigned int intsize,
 874                                 unsigned long *out_hwirq, unsigned int *out_type)
 875 {
 876         if (WARN_ON(intsize < 1))
 877                 return -EINVAL;
 878         *out_hwirq = intspec[0];
 879         *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
 880         return 0;
 881 }
 882 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 883
 884 const struct irq_domain_ops irq_domain_simple_ops = {
 885         .xlate = irq_domain_xlate_onetwocell,
 886 };
 887 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
 888
 889 #ifdef CONFIG_OF_IRQ
 890 void irq_domain_generate_simple(const struct of_device_id *match,
 891                                 u64 phys_base, unsigned int irq_start)
 892 {
 893         struct device_node *node;
 894         pr_debug("looking for phys_base=%llx, irq_start=%i\n",
 895                 (unsigned long long) phys_base, (int) irq_start);
 896         node = of_find_matching_node_by_address(NULL, match, phys_base);
 897         if (node)
 898                 irq_domain_add_legacy(node, 32, irq_start, 0,
 899                                       &irq_domain_simple_ops, NULL);
 900 }
 901 EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
 902 #endif