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. For the legacy domain, IRQ descriptors will also
 152 * be allocated.
 153 *
 154 * This is intended to implement the expected behaviour for most
 155 * interrupt controllers which is that a linear mapping should
 156 * normally be used unless the system requires a legacy mapping in
 157 * order to support supplying interrupt numbers during non-DT
 158 * registration of devices.
 159 */
 160struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
 161                                         unsigned int size,
 162                                         unsigned int first_irq,
 163                                         const struct irq_domain_ops *ops,
 164                                         void *host_data)
 165{
 166        if (first_irq > 0) {
 167                int irq_base;
 168
 169                if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
 170                        /*
 171                         * Set the descriptor allocator to search for a
 172                         * 1-to-1 mapping, such as irq_alloc_desc_at().
 173                         * Use of_node_to_nid() which is defined to
 174                         * numa_node_id() on platforms that have no custom
 175                         * implementation.
 176                         */
 177                        irq_base = irq_alloc_descs(first_irq, first_irq, size,
 178                                                   of_node_to_nid(of_node));
 179                        if (irq_base < 0) {
 180                                WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 181                                     first_irq);
 182                                irq_base = first_irq;
 183                        }
 184                } else
 185                        irq_base = first_irq;
 186
 187                return irq_domain_add_legacy(of_node, size, irq_base, 0,
 188                                             ops, host_data);
 189        }
 190
 191        /* A linear domain is the default */
 192        return irq_domain_add_linear(of_node, size, ops, host_data);
 193}
 194
 195/**
 196 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
 197 * @of_node: pointer to interrupt controller's device tree node.
 198 * @size: total number of irqs in legacy mapping
 199 * @first_irq: first number of irq block assigned to the domain
 200 * @first_hwirq: first hwirq number to use for the translation. Should normally
 201 *               be '0', but a positive integer can be used if the effective
 202 *               hwirqs numbering does not begin at zero.
 203 * @ops: map/unmap domain callbacks
 204 * @host_data: Controller private data pointer
 205 *
 206 * Note: the map() callback will be called before this function returns
 207 * for all legacy interrupts except 0 (which is always the invalid irq for
 208 * a legacy controller).
 209 */
 210struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 211                                         unsigned int size,
 212                                         unsigned int first_irq,
 213                                         irq_hw_number_t first_hwirq,
 214                                         const struct irq_domain_ops *ops,
 215                                         void *host_data)
 216{
 217        struct irq_domain *domain;
 218        unsigned int i;
 219
 220        domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
 221        if (!domain)
 222                return NULL;
 223
 224        domain->revmap_data.legacy.first_irq = first_irq;
 225        domain->revmap_data.legacy.first_hwirq = first_hwirq;
 226        domain->revmap_data.legacy.size = size;
 227
 228        mutex_lock(&irq_domain_mutex);
 229        /* Verify that all the irqs are available */
 230        for (i = 0; i < size; i++) {
 231                int irq = first_irq + i;
 232                struct irq_data *irq_data = irq_get_irq_data(irq);
 233
 234                if (WARN_ON(!irq_data || irq_data->domain)) {
 235                        mutex_unlock(&irq_domain_mutex);
 236                        irq_domain_free(domain);
 237                        return NULL;
 238                }
 239        }
 240
 241        /* Claim all of the irqs before registering a legacy domain */
 242        for (i = 0; i < size; i++) {
 243                struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
 244                irq_data->hwirq = first_hwirq + i;
 245                irq_data->domain = domain;
 246        }
 247        mutex_unlock(&irq_domain_mutex);
 248
 249        for (i = 0; i < size; i++) {
 250                int irq = first_irq + i;
 251                int hwirq = first_hwirq + i;
 252
 253                /* IRQ0 gets ignored */
 254                if (!irq)
 255                        continue;
 256
 257                /* Legacy flags are left to default at this point,
 258                 * one can then use irq_create_mapping() to
 259                 * explicitly change them
 260                 */
 261                if (ops->map)
 262                        ops->map(domain, irq, hwirq);
 263
 264                /* Clear norequest flags */
 265                irq_clear_status_flags(irq, IRQ_NOREQUEST);
 266        }
 267
 268        irq_domain_add(domain);
 269        return domain;
 270}
 271EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 272
 273/**
 274 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
 275 * @of_node: pointer to interrupt controller's device tree node.
 276 * @size: Number of interrupts in the domain.
 277 * @ops: map/unmap domain callbacks
 278 * @host_data: Controller private data pointer
 279 */
 280struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
 281                                         unsigned int size,
 282                                         const struct irq_domain_ops *ops,
 283                                         void *host_data)
 284{
 285        struct irq_domain *domain;
 286        unsigned int *revmap;
 287
 288        revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
 289                              of_node_to_nid(of_node));
 290        if (WARN_ON(!revmap))
 291                return NULL;
 292
 293        domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
 294        if (!domain) {
 295                kfree(revmap);
 296                return NULL;
 297        }
 298        domain->revmap_data.linear.size = size;
 299        domain->revmap_data.linear.revmap = revmap;
 300        irq_domain_add(domain);
 301        return domain;
 302}
 303EXPORT_SYMBOL_GPL(irq_domain_add_linear);
 304
 305struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 306                                         unsigned int max_irq,
 307                                         const struct irq_domain_ops *ops,
 308                                         void *host_data)
 309{
 310        struct irq_domain *domain = irq_domain_alloc(of_node,
 311                                        IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
 312        if (domain) {
 313                domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
 314                irq_domain_add(domain);
 315        }
 316        return domain;
 317}
 318EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
 319
 320/**
 321 * irq_domain_add_tree()
 322 * @of_node: pointer to interrupt controller's device tree node.
 323 * @ops: map/unmap domain callbacks
 324 *
 325 * Note: The radix tree will be allocated later during boot automatically
 326 * (the reverse mapping will use the slow path until that happens).
 327 */
 328struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
 329                                         const struct irq_domain_ops *ops,
 330                                         void *host_data)
 331{
 332        struct irq_domain *domain = irq_domain_alloc(of_node,
 333                                        IRQ_DOMAIN_MAP_TREE, ops, host_data);
 334        if (domain) {
 335                INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
 336                irq_domain_add(domain);
 337        }
 338        return domain;
 339}
 340EXPORT_SYMBOL_GPL(irq_domain_add_tree);
 341
 342/**
 343 * irq_find_host() - Locates a domain for a given device node
 344 * @node: device-tree node of the interrupt controller
 345 */
 346struct irq_domain *irq_find_host(struct device_node *node)
 347{
 348        struct irq_domain *h, *found = NULL;
 349        int rc;
 350
 351        /* We might want to match the legacy controller last since
 352         * it might potentially be set to match all interrupts in
 353         * the absence of a device node. This isn't a problem so far
 354         * yet though...
 355         */
 356        mutex_lock(&irq_domain_mutex);
 357        list_for_each_entry(h, &irq_domain_list, link) {
 358                if (h->ops->match)
 359                        rc = h->ops->match(h, node);
 360                else
 361                        rc = (h->of_node != NULL) && (h->of_node == node);
 362
 363                if (rc) {
 364                        found = h;
 365                        break;
 366                }
 367        }
 368        mutex_unlock(&irq_domain_mutex);
 369        return found;
 370}
 371EXPORT_SYMBOL_GPL(irq_find_host);
 372
 373/**
 374 * irq_set_default_host() - Set a "default" irq domain
 375 * @domain: default domain pointer
 376 *
 377 * For convenience, it's possible to set a "default" domain that will be used
 378 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 379 * platforms that want to manipulate a few hard coded interrupt numbers that
 380 * aren't properly represented in the device-tree.
 381 */
 382void irq_set_default_host(struct irq_domain *domain)
 383{
 384        pr_debug("Default domain set to @0x%p\n", domain);
 385
 386        irq_default_domain = domain;
 387}
 388EXPORT_SYMBOL_GPL(irq_set_default_host);
 389
 390static void irq_domain_disassociate_many(struct irq_domain *domain,
 391                                         unsigned int irq_base, int count)
 392{
 393        /*
 394         * disassociate in reverse order;
 395         * not strictly necessary, but nice for unwinding
 396         */
 397        while (count--) {
 398                int irq = irq_base + count;
 399                struct irq_data *irq_data = irq_get_irq_data(irq);
 400                irq_hw_number_t hwirq = irq_data->hwirq;
 401
 402                if (WARN_ON(!irq_data || irq_data->domain != domain))
 403                        continue;
 404
 405                irq_set_status_flags(irq, IRQ_NOREQUEST);
 406
 407                /* remove chip and handler */
 408                irq_set_chip_and_handler(irq, NULL, NULL);
 409
 410                /* Make sure it's completed */
 411                synchronize_irq(irq);
 412
 413                /* Tell the PIC about it */
 414                if (domain->ops->unmap)
 415                        domain->ops->unmap(domain, irq);
 416                smp_mb();
 417
 418                irq_data->domain = NULL;
 419                irq_data->hwirq = 0;
 420
 421                /* Clear reverse map */
 422                switch(domain->revmap_type) {
 423                case IRQ_DOMAIN_MAP_LINEAR:
 424                        if (hwirq < domain->revmap_data.linear.size)
 425                                domain->revmap_data.linear.revmap[hwirq] = 0;
 426                        break;
 427                case IRQ_DOMAIN_MAP_TREE:
 428                        mutex_lock(&revmap_trees_mutex);
 429                        radix_tree_delete(&domain->revmap_data.tree, hwirq);
 430                        mutex_unlock(&revmap_trees_mutex);
 431                        break;
 432                }
 433        }
 434}
 435
 436int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 437                              irq_hw_number_t hwirq_base, int count)
 438{
 439        unsigned int virq = irq_base;
 440        irq_hw_number_t hwirq = hwirq_base;
 441        int i, ret;
 442
 443        pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 444                of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
 445
 446        for (i = 0; i < count; i++) {
 447                struct irq_data *irq_data = irq_get_irq_data(virq + i);
 448
 449                if (WARN(!irq_data, "error: irq_desc not allocated; "
 450                         "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
 451                        return -EINVAL;
 452                if (WARN(irq_data->domain, "error: irq_desc already associated; "
 453                         "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
 454                        return -EINVAL;
 455        };
 456
 457        for (i = 0; i < count; i++, virq++, hwirq++) {
 458                struct irq_data *irq_data = irq_get_irq_data(virq);
 459
 460                irq_data->hwirq = hwirq;
 461                irq_data->domain = domain;
 462                if (domain->ops->map) {
 463                        ret = domain->ops->map(domain, virq, hwirq);
 464                        if (ret != 0) {
 465                                pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
 466                                       virq, hwirq, ret);
 467                                WARN_ON(1);
 468                                irq_data->domain = NULL;
 469                                irq_data->hwirq = 0;
 470                                goto err_unmap;
 471                        }
 472                }
 473
 474                switch (domain->revmap_type) {
 475                case IRQ_DOMAIN_MAP_LINEAR:
 476                        if (hwirq < domain->revmap_data.linear.size)
 477                                domain->revmap_data.linear.revmap[hwirq] = virq;
 478                        break;
 479                case IRQ_DOMAIN_MAP_TREE:
 480                        mutex_lock(&revmap_trees_mutex);
 481                        radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
 482                        mutex_unlock(&revmap_trees_mutex);
 483                        break;
 484                }
 485
 486                irq_clear_status_flags(virq, IRQ_NOREQUEST);
 487        }
 488
 489        return 0;
 490
 491 err_unmap:
 492        irq_domain_disassociate_many(domain, irq_base, i);
 493        return -EINVAL;
 494}
 495EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 496
 497/**
 498 * irq_create_direct_mapping() - Allocate an irq for direct mapping
 499 * @domain: domain to allocate the irq for or NULL for default domain
 500 *
 501 * This routine is used for irq controllers which can choose the hardware
 502 * interrupt numbers they generate. In such a case it's simplest to use
 503 * the linux irq as the hardware interrupt number.
 504 */
 505unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 506{
 507        unsigned int virq;
 508
 509        if (domain == NULL)
 510                domain = irq_default_domain;
 511
 512        if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
 513                return 0;
 514
 515        virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 516        if (!virq) {
 517                pr_debug("create_direct virq allocation failed\n");
 518                return 0;
 519        }
 520        if (virq >= domain->revmap_data.nomap.max_irq) {
 521                pr_err("ERROR: no free irqs available below %i maximum\n",
 522                        domain->revmap_data.nomap.max_irq);
 523                irq_free_desc(virq);
 524                return 0;
 525        }
 526        pr_debug("create_direct obtained virq %d\n", virq);
 527
 528        if (irq_domain_associate(domain, virq, virq)) {
 529                irq_free_desc(virq);
 530                return 0;
 531        }
 532
 533        return virq;
 534}
 535EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 536
 537/**
 538 * irq_create_mapping() - Map a hardware interrupt into linux irq space
 539 * @domain: domain owning this hardware interrupt or NULL for default domain
 540 * @hwirq: hardware irq number in that domain space
 541 *
 542 * Only one mapping per hardware interrupt is permitted. Returns a linux
 543 * irq number.
 544 * If the sense/trigger is to be specified, set_irq_type() should be called
 545 * on the number returned from that call.
 546 */
 547unsigned int irq_create_mapping(struct irq_domain *domain,
 548                                irq_hw_number_t hwirq)
 549{
 550        unsigned int hint;
 551        int virq;
 552
 553        pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 554
 555        /* Look for default domain if nececssary */
 556        if (domain == NULL)
 557                domain = irq_default_domain;
 558        if (domain == NULL) {
 559                pr_warning("irq_create_mapping called for"
 560                           " NULL domain, hwirq=%lx\n", hwirq);
 561                WARN_ON(1);
 562                return 0;
 563        }
 564        pr_debug("-> using domain @%p\n", domain);
 565
 566        /* Check if mapping already exists */
 567        virq = irq_find_mapping(domain, hwirq);
 568        if (virq) {
 569                pr_debug("-> existing mapping on virq %d\n", virq);
 570                return virq;
 571        }
 572
 573        /* Get a virtual interrupt number */
 574        if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
 575                return irq_domain_legacy_revmap(domain, hwirq);
 576
 577        /* Allocate a virtual interrupt number */
 578        hint = hwirq % nr_irqs;
 579        if (hint == 0)
 580                hint++;
 581        virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
 582        if (virq <= 0)
 583                virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 584        if (virq <= 0) {
 585                pr_debug("-> virq allocation failed\n");
 586                return 0;
 587        }
 588
 589        if (irq_domain_associate(domain, virq, hwirq)) {
 590                irq_free_desc(virq);
 591                return 0;
 592        }
 593
 594        pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 595                hwirq, of_node_full_name(domain->of_node), virq);
 596
 597        return virq;
 598}
 599EXPORT_SYMBOL_GPL(irq_create_mapping);
 600
 601/**
 602 * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
 603 * @domain: domain owning the interrupt range
 604 * @irq_base: beginning of linux IRQ range
 605 * @hwirq_base: beginning of hardware IRQ range
 606 * @count: Number of interrupts to map
 607 *
 608 * This routine is used for allocating and mapping a range of hardware
 609 * irqs to linux irqs where the linux irq numbers are at pre-defined
 610 * locations. For use by controllers that already have static mappings
 611 * to insert in to the domain.
 612 *
 613 * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
 614 * domain insertion.
 615 *
 616 * 0 is returned upon success, while any failure to establish a static
 617 * mapping is treated as an error.
 618 */
 619int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
 620                               irq_hw_number_t hwirq_base, int count)
 621{
 622        int ret;
 623
 624        ret = irq_alloc_descs(irq_base, irq_base, count,
 625                              of_node_to_nid(domain->of_node));
 626        if (unlikely(ret < 0))
 627                return ret;
 628
 629        ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count);
 630        if (unlikely(ret < 0)) {
 631                irq_free_descs(irq_base, count);
 632                return ret;
 633        }
 634
 635        return 0;
 636}
 637EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
 638
 639unsigned int irq_create_of_mapping(struct device_node *controller,
 640                                   const u32 *intspec, unsigned int intsize)
 641{
 642        struct irq_domain *domain;
 643        irq_hw_number_t hwirq;
 644        unsigned int type = IRQ_TYPE_NONE;
 645        unsigned int virq;
 646
 647        domain = controller ? irq_find_host(controller) : irq_default_domain;
 648        if (!domain) {
 649#ifdef CONFIG_MIPS
 650                /*
 651                 * Workaround to avoid breaking interrupt controller drivers
 652                 * that don't yet register an irq_domain.  This is temporary
 653                 * code. ~~~gcl, Feb 24, 2012
 654                 *
 655                 * Scheduled for removal in Linux v3.6.  That should be enough
 656                 * time.
 657                 */
 658                if (intsize > 0)
 659                        return intspec[0];
 660#endif
 661                pr_warning("no irq domain found for %s !\n",
 662                           of_node_full_name(controller));
 663                return 0;
 664        }
 665
 666        /* If domain has no translation, then we assume interrupt line */
 667        if (domain->ops->xlate == NULL)
 668                hwirq = intspec[0];
 669        else {
 670                if (domain->ops->xlate(domain, controller, intspec, intsize,
 671                                     &hwirq, &type))
 672                        return 0;
 673        }
 674
 675        /* Create mapping */
 676        virq = irq_create_mapping(domain, hwirq);
 677        if (!virq)
 678                return virq;
 679
 680        /* Set type if specified and different than the current one */
 681        if (type != IRQ_TYPE_NONE &&
 682            type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
 683                irq_set_irq_type(virq, type);
 684        return virq;
 685}
 686EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 687
 688/**
 689 * irq_dispose_mapping() - Unmap an interrupt
 690 * @virq: linux irq number of the interrupt to unmap
 691 */
 692void irq_dispose_mapping(unsigned int virq)
 693{
 694        struct irq_data *irq_data = irq_get_irq_data(virq);
 695        struct irq_domain *domain;
 696
 697        if (!virq || !irq_data)
 698                return;
 699
 700        domain = irq_data->domain;
 701        if (WARN_ON(domain == NULL))
 702                return;
 703
 704        /* Never unmap legacy interrupts */
 705        if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
 706                return;
 707
 708        irq_domain_disassociate_many(domain, virq, 1);
 709        irq_free_desc(virq);
 710}
 711EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 712
 713/**
 714 * irq_find_mapping() - Find a linux irq from an hw irq number.
 715 * @domain: domain owning this hardware interrupt
 716 * @hwirq: hardware irq number in that domain space
 717 */
 718unsigned int irq_find_mapping(struct irq_domain *domain,
 719                              irq_hw_number_t hwirq)
 720{
 721        struct irq_data *data;
 722
 723        /* Look for default domain if nececssary */
 724        if (domain == NULL)
 725                domain = irq_default_domain;
 726        if (domain == NULL)
 727                return 0;
 728
 729        switch (domain->revmap_type) {
 730        case IRQ_DOMAIN_MAP_LEGACY:
 731                return irq_domain_legacy_revmap(domain, hwirq);
 732        case IRQ_DOMAIN_MAP_LINEAR:
 733                return irq_linear_revmap(domain, hwirq);
 734        case IRQ_DOMAIN_MAP_TREE:
 735                rcu_read_lock();
 736                data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
 737                rcu_read_unlock();
 738                if (data)
 739                        return data->irq;
 740                break;
 741        case IRQ_DOMAIN_MAP_NOMAP:
 742                data = irq_get_irq_data(hwirq);
 743                if (data && (data->domain == domain) && (data->hwirq == hwirq))
 744                        return hwirq;
 745                break;
 746        }
 747
 748        return 0;
 749}
 750EXPORT_SYMBOL_GPL(irq_find_mapping);
 751
 752/**
 753 * irq_linear_revmap() - Find a linux irq from a hw irq number.
 754 * @domain: domain owning this hardware interrupt
 755 * @hwirq: hardware irq number in that domain space
 756 *
 757 * This is a fast path that can be called directly by irq controller code to
 758 * save a handful of instructions.
 759 */
 760unsigned int irq_linear_revmap(struct irq_domain *domain,
 761                               irq_hw_number_t hwirq)
 762{
 763        BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR);
 764
 765        /* Check revmap bounds; complain if exceeded */
 766        if (WARN_ON(hwirq >= domain->revmap_data.linear.size))
 767                return 0;
 768
 769        return domain->revmap_data.linear.revmap[hwirq];
 770}
 771EXPORT_SYMBOL_GPL(irq_linear_revmap);
 772
 773#ifdef CONFIG_IRQ_DOMAIN_DEBUG
 774static int virq_debug_show(struct seq_file *m, void *private)
 775{
 776        unsigned long flags;
 777        struct irq_desc *desc;
 778        const char *p;
 779        static const char none[] = "none";
 780        void *data;
 781        int i;
 782
 783        seq_printf(m, "%-5s  %-7s  %-15s  %-*s  %s\n", "irq", "hwirq",
 784                      "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
 785                      "domain name");
 786
 787        for (i = 1; i < nr_irqs; i++) {
 788                desc = irq_to_desc(i);
 789                if (!desc)
 790                        continue;
 791
 792                raw_spin_lock_irqsave(&desc->lock, flags);
 793
 794                if (desc->action && desc->action->handler) {
 795                        struct irq_chip *chip;
 796
 797                        seq_printf(m, "%5d  ", i);
 798                        seq_printf(m, "0x%05lx  ", desc->irq_data.hwirq);
 799
 800                        chip = irq_desc_get_chip(desc);
 801                        if (chip && chip->name)
 802                                p = chip->name;
 803                        else
 804                                p = none;
 805                        seq_printf(m, "%-15s  ", p);
 806
 807                        data = irq_desc_get_chip_data(desc);
 808                        seq_printf(m, data ? "0x%p  " : "  %p  ", data);
 809
 810                        if (desc->irq_data.domain)
 811                                p = of_node_full_name(desc->irq_data.domain->of_node);
 812                        else
 813                                p = none;
 814                        seq_printf(m, "%s\n", p);
 815                }
 816
 817                raw_spin_unlock_irqrestore(&desc->lock, flags);
 818        }
 819
 820        return 0;
 821}
 822
 823static int virq_debug_open(struct inode *inode, struct file *file)
 824{
 825        return single_open(file, virq_debug_show, inode->i_private);
 826}
 827
 828static const struct file_operations virq_debug_fops = {
 829        .open = virq_debug_open,
 830        .read = seq_read,
 831        .llseek = seq_lseek,
 832        .release = single_release,
 833};
 834
 835static int __init irq_debugfs_init(void)
 836{
 837        if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
 838                                 NULL, &virq_debug_fops) == NULL)
 839                return -ENOMEM;
 840
 841        return 0;
 842}
 843__initcall(irq_debugfs_init);
 844#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
 845
 846/**
 847 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 848 *
 849 * Device Tree IRQ specifier translation function which works with one cell
 850 * bindings where the cell value maps directly to the hwirq number.
 851 */
 852int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 853                             const u32 *intspec, unsigned int intsize,
 854                             unsigned long *out_hwirq, unsigned int *out_type)
 855{
 856        if (WARN_ON(intsize < 1))
 857                return -EINVAL;
 858        *out_hwirq = intspec[0];
 859        *out_type = IRQ_TYPE_NONE;
 860        return 0;
 861}
 862EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 863
 864/**
 865 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
 866 *
 867 * Device Tree IRQ specifier translation function which works with two cell
 868 * bindings where the cell values map directly to the hwirq number
 869 * and linux irq flags.
 870 */
 871int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
 872                        const u32 *intspec, unsigned int intsize,
 873                        irq_hw_number_t *out_hwirq, unsigned int *out_type)
 874{
 875        if (WARN_ON(intsize < 2))
 876                return -EINVAL;
 877        *out_hwirq = intspec[0];
 878        *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
 879        return 0;
 880}
 881EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
 882
 883/**
 884 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
 885 *
 886 * Device Tree IRQ specifier translation function which works with either one
 887 * or two cell bindings where the cell values map directly to the hwirq number
 888 * and linux irq flags.
 889 *
 890 * Note: don't use this function unless your interrupt controller explicitly
 891 * supports both one and two cell bindings.  For the majority of controllers
 892 * the _onecell() or _twocell() variants above should be used.
 893 */
 894int irq_domain_xlate_onetwocell(struct irq_domain *d,
 895                                struct device_node *ctrlr,
 896                                const u32 *intspec, unsigned int intsize,
 897                                unsigned long *out_hwirq, unsigned int *out_type)
 898{
 899        if (WARN_ON(intsize < 1))
 900                return -EINVAL;
 901        *out_hwirq = intspec[0];
 902        *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
 903        return 0;
 904}
 905EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 906
 907const struct irq_domain_ops irq_domain_simple_ops = {
 908        .xlate = irq_domain_xlate_onetwocell,
 909};
 910EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
 911
 912#ifdef CONFIG_OF_IRQ
 913void irq_domain_generate_simple(const struct of_device_id *match,
 914                                u64 phys_base, unsigned int irq_start)
 915{
 916        struct device_node *node;
 917        pr_debug("looking for phys_base=%llx, irq_start=%i\n",
 918                (unsigned long long) phys_base, (int) irq_start);
 919        node = of_find_matching_node_by_address(NULL, match, phys_base);
 920        if (node)
 921                irq_domain_add_legacy(node, 32, irq_start, 0,
 922                                      &irq_domain_simple_ops, NULL);
 923}
 924EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
 925#endif
 926
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