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
  19static LIST_HEAD(irq_domain_list);
  20static DEFINE_MUTEX(irq_domain_mutex);
  21
  22static DEFINE_MUTEX(revmap_trees_mutex);
  23static struct irq_domain *irq_default_domain;
  24
  25/**
  26 * __irq_domain_add() - Allocate a new irq_domain data structure
  27 * @of_node: optional device-tree node of the interrupt controller
  28 * @size: Size of linear map; 0 for radix mapping only
  29 * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
  30 *              direct mapping
  31 * @ops: map/unmap domain callbacks
  32 * @host_data: Controller private data pointer
  33 *
  34 * Allocates and initialize and irq_domain structure.  Caller is expected to
  35 * register allocated irq_domain with irq_domain_register().  Returns pointer
  36 * to IRQ domain, or NULL on failure.
  37 */
  38struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
  39                                    irq_hw_number_t hwirq_max, int direct_max,
  40                                    const struct irq_domain_ops *ops,
  41                                    void *host_data)
  42{
  43        struct irq_domain *domain;
  44
  45        domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
  46                              GFP_KERNEL, of_node_to_nid(of_node));
  47        if (WARN_ON(!domain))
  48                return NULL;
  49
  50        /* Fill structure */
  51        INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
  52        domain->ops = ops;
  53        domain->host_data = host_data;
  54        domain->of_node = of_node_get(of_node);
  55        domain->hwirq_max = hwirq_max;
  56        domain->revmap_size = size;
  57        domain->revmap_direct_max_irq = direct_max;
  58
  59        mutex_lock(&irq_domain_mutex);
  60        list_add(&domain->link, &irq_domain_list);
  61        mutex_unlock(&irq_domain_mutex);
  62
  63        pr_debug("Added domain %s\n", domain->name);
  64        return domain;
  65}
  66EXPORT_SYMBOL_GPL(__irq_domain_add);
  67
  68/**
  69 * irq_domain_remove() - Remove an irq domain.
  70 * @domain: domain to remove
  71 *
  72 * This routine is used to remove an irq domain. The caller must ensure
  73 * that all mappings within the domain have been disposed of prior to
  74 * use, depending on the revmap type.
  75 */
  76void irq_domain_remove(struct irq_domain *domain)
  77{
  78        mutex_lock(&irq_domain_mutex);
  79
  80        /*
  81         * radix_tree_delete() takes care of destroying the root
  82         * node when all entries are removed. Shout if there are
  83         * any mappings left.
  84         */
  85        WARN_ON(domain->revmap_tree.height);
  86
  87        list_del(&domain->link);
  88
  89        /*
  90         * If the going away domain is the default one, reset it.
  91         */
  92        if (unlikely(irq_default_domain == domain))
  93                irq_set_default_host(NULL);
  94
  95        mutex_unlock(&irq_domain_mutex);
  96
  97        pr_debug("Removed domain %s\n", domain->name);
  98
  99        of_node_put(domain->of_node);
 100        kfree(domain);
 101}
 102EXPORT_SYMBOL_GPL(irq_domain_remove);
 103
 104/**
 105 * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
 106 * @of_node: pointer to interrupt controller's device tree node.
 107 * @size: total number of irqs in mapping
 108 * @first_irq: first number of irq block assigned to the domain,
 109 *      pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
 110 *      pre-map all of the irqs in the domain to virqs starting at first_irq.
 111 * @ops: map/unmap domain callbacks
 112 * @host_data: Controller private data pointer
 113 *
 114 * Allocates an irq_domain, and optionally if first_irq is positive then also
 115 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
 116 *
 117 * This is intended to implement the expected behaviour for most
 118 * interrupt controllers. If device tree is used, then first_irq will be 0 and
 119 * irqs get mapped dynamically on the fly. However, if the controller requires
 120 * static virq assignments (non-DT boot) then it will set that up correctly.
 121 */
 122struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
 123                                         unsigned int size,
 124                                         unsigned int first_irq,
 125                                         const struct irq_domain_ops *ops,
 126                                         void *host_data)
 127{
 128        struct irq_domain *domain;
 129
 130        domain = __irq_domain_add(of_node, size, size, 0, ops, host_data);
 131        if (!domain)
 132                return NULL;
 133
 134        if (first_irq > 0) {
 135                if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
 136                        /* attempt to allocated irq_descs */
 137                        int rc = irq_alloc_descs(first_irq, first_irq, size,
 138                                                 of_node_to_nid(of_node));
 139                        if (rc < 0)
 140                                pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 141                                        first_irq);
 142                }
 143                irq_domain_associate_many(domain, first_irq, 0, size);
 144        }
 145
 146        return domain;
 147}
 148EXPORT_SYMBOL_GPL(irq_domain_add_simple);
 149
 150/**
 151 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
 152 * @of_node: pointer to interrupt controller's device tree node.
 153 * @size: total number of irqs in legacy mapping
 154 * @first_irq: first number of irq block assigned to the domain
 155 * @first_hwirq: first hwirq number to use for the translation. Should normally
 156 *               be '0', but a positive integer can be used if the effective
 157 *               hwirqs numbering does not begin at zero.
 158 * @ops: map/unmap domain callbacks
 159 * @host_data: Controller private data pointer
 160 *
 161 * Note: the map() callback will be called before this function returns
 162 * for all legacy interrupts except 0 (which is always the invalid irq for
 163 * a legacy controller).
 164 */
 165struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 166                                         unsigned int size,
 167                                         unsigned int first_irq,
 168                                         irq_hw_number_t first_hwirq,
 169                                         const struct irq_domain_ops *ops,
 170                                         void *host_data)
 171{
 172        struct irq_domain *domain;
 173
 174        domain = __irq_domain_add(of_node, first_hwirq + size,
 175                                  first_hwirq + size, 0, ops, host_data);
 176        if (!domain)
 177                return NULL;
 178
 179        irq_domain_associate_many(domain, first_irq, first_hwirq, size);
 180
 181        return domain;
 182}
 183EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 184
 185/**
 186 * irq_find_host() - Locates a domain for a given device node
 187 * @node: device-tree node of the interrupt controller
 188 */
 189struct irq_domain *irq_find_host(struct device_node *node)
 190{
 191        struct irq_domain *h, *found = NULL;
 192        int rc;
 193
 194        /* We might want to match the legacy controller last since
 195         * it might potentially be set to match all interrupts in
 196         * the absence of a device node. This isn't a problem so far
 197         * yet though...
 198         */
 199        mutex_lock(&irq_domain_mutex);
 200        list_for_each_entry(h, &irq_domain_list, link) {
 201                if (h->ops->match)
 202                        rc = h->ops->match(h, node);
 203                else
 204                        rc = (h->of_node != NULL) && (h->of_node == node);
 205
 206                if (rc) {
 207                        found = h;
 208                        break;
 209                }
 210        }
 211        mutex_unlock(&irq_domain_mutex);
 212        return found;
 213}
 214EXPORT_SYMBOL_GPL(irq_find_host);
 215
 216/**
 217 * irq_set_default_host() - Set a "default" irq domain
 218 * @domain: default domain pointer
 219 *
 220 * For convenience, it's possible to set a "default" domain that will be used
 221 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 222 * platforms that want to manipulate a few hard coded interrupt numbers that
 223 * aren't properly represented in the device-tree.
 224 */
 225void irq_set_default_host(struct irq_domain *domain)
 226{
 227        pr_debug("Default domain set to @0x%p\n", domain);
 228
 229        irq_default_domain = domain;
 230}
 231EXPORT_SYMBOL_GPL(irq_set_default_host);
 232
 233static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
 234{
 235        struct irq_data *irq_data = irq_get_irq_data(irq);
 236        irq_hw_number_t hwirq;
 237
 238        if (WARN(!irq_data || irq_data->domain != domain,
 239                 "virq%i doesn't exist; cannot disassociate\n", irq))
 240                return;
 241
 242        hwirq = irq_data->hwirq;
 243        irq_set_status_flags(irq, IRQ_NOREQUEST);
 244
 245        /* remove chip and handler */
 246        irq_set_chip_and_handler(irq, NULL, NULL);
 247
 248        /* Make sure it's completed */
 249        synchronize_irq(irq);
 250
 251        /* Tell the PIC about it */
 252        if (domain->ops->unmap)
 253                domain->ops->unmap(domain, irq);
 254        smp_mb();
 255
 256        irq_data->domain = NULL;
 257        irq_data->hwirq = 0;
 258
 259        /* Clear reverse map for this hwirq */
 260        if (hwirq < domain->revmap_size) {
 261                domain->linear_revmap[hwirq] = 0;
 262        } else {
 263                mutex_lock(&revmap_trees_mutex);
 264                radix_tree_delete(&domain->revmap_tree, hwirq);
 265                mutex_unlock(&revmap_trees_mutex);
 266        }
 267}
 268
 269int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
 270                         irq_hw_number_t hwirq)
 271{
 272        struct irq_data *irq_data = irq_get_irq_data(virq);
 273        int ret;
 274
 275        if (WARN(hwirq >= domain->hwirq_max,
 276                 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
 277                return -EINVAL;
 278        if (WARN(!irq_data, "error: virq%i is not allocated", virq))
 279                return -EINVAL;
 280        if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
 281                return -EINVAL;
 282
 283        mutex_lock(&irq_domain_mutex);
 284        irq_data->hwirq = hwirq;
 285        irq_data->domain = domain;
 286        if (domain->ops->map) {
 287                ret = domain->ops->map(domain, virq, hwirq);
 288                if (ret != 0) {
 289                        /*
 290                         * If map() returns -EPERM, this interrupt is protected
 291                         * by the firmware or some other service and shall not
 292                         * be mapped. Don't bother telling the user about it.
 293                         */
 294                        if (ret != -EPERM) {
 295                                pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
 296                                       domain->name, hwirq, virq, ret);
 297                        }
 298                        irq_data->domain = NULL;
 299                        irq_data->hwirq = 0;
 300                        mutex_unlock(&irq_domain_mutex);
 301                        return ret;
 302                }
 303
 304                /* If not already assigned, give the domain the chip's name */
 305                if (!domain->name && irq_data->chip)
 306                        domain->name = irq_data->chip->name;
 307        }
 308
 309        if (hwirq < domain->revmap_size) {
 310                domain->linear_revmap[hwirq] = virq;
 311        } else {
 312                mutex_lock(&revmap_trees_mutex);
 313                radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
 314                mutex_unlock(&revmap_trees_mutex);
 315        }
 316        mutex_unlock(&irq_domain_mutex);
 317
 318        irq_clear_status_flags(virq, IRQ_NOREQUEST);
 319
 320        return 0;
 321}
 322EXPORT_SYMBOL_GPL(irq_domain_associate);
 323
 324void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 325                               irq_hw_number_t hwirq_base, int count)
 326{
 327        int i;
 328
 329        pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 330                of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
 331
 332        for (i = 0; i < count; i++) {
 333                irq_domain_associate(domain, irq_base + i, hwirq_base + i);
 334        }
 335}
 336EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 337
 338/**
 339 * irq_create_direct_mapping() - Allocate an irq for direct mapping
 340 * @domain: domain to allocate the irq for or NULL for default domain
 341 *
 342 * This routine is used for irq controllers which can choose the hardware
 343 * interrupt numbers they generate. In such a case it's simplest to use
 344 * the linux irq as the hardware interrupt number. It still uses the linear
 345 * or radix tree to store the mapping, but the irq controller can optimize
 346 * the revmap path by using the hwirq directly.
 347 */
 348unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 349{
 350        unsigned int virq;
 351
 352        if (domain == NULL)
 353                domain = irq_default_domain;
 354
 355        virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 356        if (!virq) {
 357                pr_debug("create_direct virq allocation failed\n");
 358                return 0;
 359        }
 360        if (virq >= domain->revmap_direct_max_irq) {
 361                pr_err("ERROR: no free irqs available below %i maximum\n",
 362                        domain->revmap_direct_max_irq);
 363                irq_free_desc(virq);
 364                return 0;
 365        }
 366        pr_debug("create_direct obtained virq %d\n", virq);
 367
 368        if (irq_domain_associate(domain, virq, virq)) {
 369                irq_free_desc(virq);
 370                return 0;
 371        }
 372
 373        return virq;
 374}
 375EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 376
 377/**
 378 * irq_create_mapping() - Map a hardware interrupt into linux irq space
 379 * @domain: domain owning this hardware interrupt or NULL for default domain
 380 * @hwirq: hardware irq number in that domain space
 381 *
 382 * Only one mapping per hardware interrupt is permitted. Returns a linux
 383 * irq number.
 384 * If the sense/trigger is to be specified, set_irq_type() should be called
 385 * on the number returned from that call.
 386 */
 387unsigned int irq_create_mapping(struct irq_domain *domain,
 388                                irq_hw_number_t hwirq)
 389{
 390        unsigned int hint;
 391        int virq;
 392
 393        pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 394
 395        /* Look for default domain if nececssary */
 396        if (domain == NULL)
 397                domain = irq_default_domain;
 398        if (domain == NULL) {
 399                WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
 400                return 0;
 401        }
 402        pr_debug("-> using domain @%p\n", domain);
 403
 404        /* Check if mapping already exists */
 405        virq = irq_find_mapping(domain, hwirq);
 406        if (virq) {
 407                pr_debug("-> existing mapping on virq %d\n", virq);
 408                return virq;
 409        }
 410
 411        /* Allocate a virtual interrupt number */
 412        hint = hwirq % nr_irqs;
 413        if (hint == 0)
 414                hint++;
 415        virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
 416        if (virq <= 0)
 417                virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 418        if (virq <= 0) {
 419                pr_debug("-> virq allocation failed\n");
 420                return 0;
 421        }
 422
 423        if (irq_domain_associate(domain, virq, hwirq)) {
 424                irq_free_desc(virq);
 425                return 0;
 426        }
 427
 428        pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 429                hwirq, of_node_full_name(domain->of_node), virq);
 430
 431        return virq;
 432}
 433EXPORT_SYMBOL_GPL(irq_create_mapping);
 434
 435/**
 436 * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
 437 * @domain: domain owning the interrupt range
 438 * @irq_base: beginning of linux IRQ range
 439 * @hwirq_base: beginning of hardware IRQ range
 440 * @count: Number of interrupts to map
 441 *
 442 * This routine is used for allocating and mapping a range of hardware
 443 * irqs to linux irqs where the linux irq numbers are at pre-defined
 444 * locations. For use by controllers that already have static mappings
 445 * to insert in to the domain.
 446 *
 447 * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
 448 * domain insertion.
 449 *
 450 * 0 is returned upon success, while any failure to establish a static
 451 * mapping is treated as an error.
 452 */
 453int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
 454                               irq_hw_number_t hwirq_base, int count)
 455{
 456        int ret;
 457
 458        ret = irq_alloc_descs(irq_base, irq_base, count,
 459                              of_node_to_nid(domain->of_node));
 460        if (unlikely(ret < 0))
 461                return ret;
 462
 463        irq_domain_associate_many(domain, irq_base, hwirq_base, count);
 464        return 0;
 465}
 466EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
 467
 468unsigned int irq_create_of_mapping(struct device_node *controller,
 469                                   const u32 *intspec, unsigned int intsize)
 470{
 471        struct irq_domain *domain;
 472        irq_hw_number_t hwirq;
 473        unsigned int type = IRQ_TYPE_NONE;
 474        unsigned int virq;
 475
 476        domain = controller ? irq_find_host(controller) : irq_default_domain;
 477        if (!domain) {
 478                pr_warn("no irq domain found for %s !\n",
 479                        of_node_full_name(controller));
 480                return 0;
 481        }
 482
 483        /* If domain has no translation, then we assume interrupt line */
 484        if (domain->ops->xlate == NULL)
 485                hwirq = intspec[0];
 486        else {
 487                if (domain->ops->xlate(domain, controller, intspec, intsize,
 488                                     &hwirq, &type))
 489                        return 0;
 490        }
 491
 492        /* Create mapping */
 493        virq = irq_create_mapping(domain, hwirq);
 494        if (!virq)
 495                return virq;
 496
 497        /* Set type if specified and different than the current one */
 498        if (type != IRQ_TYPE_NONE &&
 499            type != irq_get_trigger_type(virq))
 500                irq_set_irq_type(virq, type);
 501        return virq;
 502}
 503EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 504
 505/**
 506 * irq_dispose_mapping() - Unmap an interrupt
 507 * @virq: linux irq number of the interrupt to unmap
 508 */
 509void irq_dispose_mapping(unsigned int virq)
 510{
 511        struct irq_data *irq_data = irq_get_irq_data(virq);
 512        struct irq_domain *domain;
 513
 514        if (!virq || !irq_data)
 515                return;
 516
 517        domain = irq_data->domain;
 518        if (WARN_ON(domain == NULL))
 519                return;
 520
 521        irq_domain_disassociate(domain, virq);
 522        irq_free_desc(virq);
 523}
 524EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 525
 526/**
 527 * irq_find_mapping() - Find a linux irq from an hw irq number.
 528 * @domain: domain owning this hardware interrupt
 529 * @hwirq: hardware irq number in that domain space
 530 */
 531unsigned int irq_find_mapping(struct irq_domain *domain,
 532                              irq_hw_number_t hwirq)
 533{
 534        struct irq_data *data;
 535
 536        /* Look for default domain if nececssary */
 537        if (domain == NULL)
 538                domain = irq_default_domain;
 539        if (domain == NULL)
 540                return 0;
 541
 542        if (hwirq < domain->revmap_direct_max_irq) {
 543                data = irq_get_irq_data(hwirq);
 544                if (data && (data->domain == domain) && (data->hwirq == hwirq))
 545                        return hwirq;
 546        }
 547
 548        /* Check if the hwirq is in the linear revmap. */
 549        if (hwirq < domain->revmap_size)
 550                return domain->linear_revmap[hwirq];
 551
 552        rcu_read_lock();
 553        data = radix_tree_lookup(&domain->revmap_tree, hwirq);
 554        rcu_read_unlock();
 555        return data ? data->irq : 0;
 556}
 557EXPORT_SYMBOL_GPL(irq_find_mapping);
 558
 559#ifdef CONFIG_IRQ_DOMAIN_DEBUG
 560static int virq_debug_show(struct seq_file *m, void *private)
 561{
 562        unsigned long flags;
 563        struct irq_desc *desc;
 564        struct irq_domain *domain;
 565        struct radix_tree_iter iter;
 566        void *data, **slot;
 567        int i;
 568
 569        seq_printf(m, " %-16s  %-6s  %-10s  %-10s  %s\n",
 570                   "name", "mapped", "linear-max", "direct-max", "devtree-node");
 571        mutex_lock(&irq_domain_mutex);
 572        list_for_each_entry(domain, &irq_domain_list, link) {
 573                int count = 0;
 574                radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
 575                        count++;
 576                seq_printf(m, "%c%-16s  %6u  %10u  %10u  %s\n",
 577                           domain == irq_default_domain ? '*' : ' ', domain->name,
 578                           domain->revmap_size + count, domain->revmap_size,
 579                           domain->revmap_direct_max_irq,
 580                           domain->of_node ? of_node_full_name(domain->of_node) : "");
 581        }
 582        mutex_unlock(&irq_domain_mutex);
 583
 584        seq_printf(m, "%-5s  %-7s  %-15s  %-*s  %6s  %-14s  %s\n", "irq", "hwirq",
 585                      "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
 586                      "active", "type", "domain");
 587
 588        for (i = 1; i < nr_irqs; i++) {
 589                desc = irq_to_desc(i);
 590                if (!desc)
 591                        continue;
 592
 593                raw_spin_lock_irqsave(&desc->lock, flags);
 594                domain = desc->irq_data.domain;
 595
 596                if (domain) {
 597                        struct irq_chip *chip;
 598                        int hwirq = desc->irq_data.hwirq;
 599                        bool direct;
 600
 601                        seq_printf(m, "%5d  ", i);
 602                        seq_printf(m, "0x%05x  ", hwirq);
 603
 604                        chip = irq_desc_get_chip(desc);
 605                        seq_printf(m, "%-15s  ", (chip && chip->name) ? chip->name : "none");
 606
 607                        data = irq_desc_get_chip_data(desc);
 608                        seq_printf(m, data ? "0x%p  " : "  %p  ", data);
 609
 610                        seq_printf(m, "   %c    ", (desc->action && desc->action->handler) ? '*' : ' ');
 611                        direct = (i == hwirq) && (i < domain->revmap_direct_max_irq);
 612                        seq_printf(m, "%6s%-8s  ",
 613                                   (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
 614                                   direct ? "(DIRECT)" : "");
 615                        seq_printf(m, "%s\n", desc->irq_data.domain->name);
 616                }
 617
 618                raw_spin_unlock_irqrestore(&desc->lock, flags);
 619        }
 620
 621        return 0;
 622}
 623
 624static int virq_debug_open(struct inode *inode, struct file *file)
 625{
 626        return single_open(file, virq_debug_show, inode->i_private);
 627}
 628
 629static const struct file_operations virq_debug_fops = {
 630        .open = virq_debug_open,
 631        .read = seq_read,
 632        .llseek = seq_lseek,
 633        .release = single_release,
 634};
 635
 636static int __init irq_debugfs_init(void)
 637{
 638        if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
 639                                 NULL, &virq_debug_fops) == NULL)
 640                return -ENOMEM;
 641
 642        return 0;
 643}
 644__initcall(irq_debugfs_init);
 645#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
 646
 647/**
 648 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 649 *
 650 * Device Tree IRQ specifier translation function which works with one cell
 651 * bindings where the cell value maps directly to the hwirq number.
 652 */
 653int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 654                             const u32 *intspec, unsigned int intsize,
 655                             unsigned long *out_hwirq, unsigned int *out_type)
 656{
 657        if (WARN_ON(intsize < 1))
 658                return -EINVAL;
 659        *out_hwirq = intspec[0];
 660        *out_type = IRQ_TYPE_NONE;
 661        return 0;
 662}
 663EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 664
 665/**
 666 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
 667 *
 668 * Device Tree IRQ specifier translation function which works with two cell
 669 * bindings where the cell values map directly to the hwirq number
 670 * and linux irq flags.
 671 */
 672int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
 673                        const u32 *intspec, unsigned int intsize,
 674                        irq_hw_number_t *out_hwirq, unsigned int *out_type)
 675{
 676        if (WARN_ON(intsize < 2))
 677                return -EINVAL;
 678        *out_hwirq = intspec[0];
 679        *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
 680        return 0;
 681}
 682EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
 683
 684/**
 685 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
 686 *
 687 * Device Tree IRQ specifier translation function which works with either one
 688 * or two cell bindings where the cell values map directly to the hwirq number
 689 * and linux irq flags.
 690 *
 691 * Note: don't use this function unless your interrupt controller explicitly
 692 * supports both one and two cell bindings.  For the majority of controllers
 693 * the _onecell() or _twocell() variants above should be used.
 694 */
 695int irq_domain_xlate_onetwocell(struct irq_domain *d,
 696                                struct device_node *ctrlr,
 697                                const u32 *intspec, unsigned int intsize,
 698                                unsigned long *out_hwirq, unsigned int *out_type)
 699{
 700        if (WARN_ON(intsize < 1))
 701                return -EINVAL;
 702        *out_hwirq = intspec[0];
 703        *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
 704        return 0;
 705}
 706EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 707
 708const struct irq_domain_ops irq_domain_simple_ops = {
 709        .xlate = irq_domain_xlate_onetwocell,
 710};
 711EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
 712
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