linux/kernel/irq/irqdomain.c
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   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
  25static LIST_HEAD(irq_domain_list);
  26static DEFINE_MUTEX(irq_domain_mutex);
  27
  28static DEFINE_MUTEX(revmap_trees_mutex);
  29static 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 */
  42static 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
  63static void irq_domain_free(struct irq_domain *domain)
  64{
  65        of_node_put(domain->of_node);
  66        kfree(domain);
  67}
  68
  69static 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 */
  86void 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}
 129EXPORT_SYMBOL_GPL(irq_domain_remove);
 130
 131static 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 */
 159struct 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 */
 187struct 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}
 248EXPORT_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 */
 257struct 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}
 280EXPORT_SYMBOL_GPL(irq_domain_add_linear);
 281
 282struct 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}
 295EXPORT_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 */
 305struct 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}
 317EXPORT_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 */
 323struct 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}
 348EXPORT_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 */
 359void 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}
 365EXPORT_SYMBOL_GPL(irq_set_default_host);
 366
 367static 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
 413int 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}
 472EXPORT_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 */
 482unsigned 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}
 512EXPORT_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 */
 524unsigned 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}
 576EXPORT_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 */
 596int 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}
 614EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
 615
 616unsigned 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}
 663EXPORT_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 */
 669void 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}
 688EXPORT_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 */
 695unsigned 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}
 727EXPORT_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 */
 737unsigned 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}
 748EXPORT_SYMBOL_GPL(irq_linear_revmap);
 749
 750#ifdef CONFIG_IRQ_DOMAIN_DEBUG
 751static 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
 800static int virq_debug_open(struct inode *inode, struct file *file)
 801{
 802        return single_open(file, virq_debug_show, inode->i_private);
 803}
 804
 805static 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
 812static 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 */
 829int 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}
 839EXPORT_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 */
 848int 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}
 858EXPORT_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 */
 871int 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}
 882EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 883
 884const struct irq_domain_ops irq_domain_simple_ops = {
 885        .xlate = irq_domain_xlate_onetwocell,
 886};
 887EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
 888
 889#ifdef CONFIG_OF_IRQ
 890void 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}
 901EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
 902#endif
 903
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