Pileus Git - ~andy/linux/blob - arch/c6x/kernel/irq.c

   1 /*
   2  *  Copyright (C) 2011 Texas Instruments Incorporated
   3  *
   4  *  This borrows heavily from powerpc version, which is:
   5  *
   6  *  Derived from arch/i386/kernel/irq.c
   7  *    Copyright (C) 1992 Linus Torvalds
   8  *  Adapted from arch/i386 by Gary Thomas
   9  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  10  *  Updated and modified by Cort Dougan <cort@fsmlabs.com>
  11  *    Copyright (C) 1996-2001 Cort Dougan
  12  *  Adapted for Power Macintosh by Paul Mackerras
  13  *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version
  18  * 2 of the License, or (at your option) any later version.
  19  */
  20 #include <linux/slab.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/radix-tree.h>
  23 #include <linux/module.h>
  24 #include <linux/of.h>
  25 #include <linux/of_irq.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/kernel_stat.h>
  28
  29 #include <asm/megamod-pic.h>
  30
  31 unsigned long irq_err_count;
  32
  33 static DEFINE_RAW_SPINLOCK(core_irq_lock);
  34
  35 static void mask_core_irq(struct irq_data *data)
  36 {
  37         unsigned int prio = data->irq;
  38
  39         BUG_ON(prio < 4 || prio >= NR_PRIORITY_IRQS);
  40
  41         raw_spin_lock(&core_irq_lock);
  42         and_creg(IER, ~(1 << prio));
  43         raw_spin_unlock(&core_irq_lock);
  44 }
  45
  46 static void unmask_core_irq(struct irq_data *data)
  47 {
  48         unsigned int prio = data->irq;
  49
  50         raw_spin_lock(&core_irq_lock);
  51         or_creg(IER, 1 << prio);
  52         raw_spin_unlock(&core_irq_lock);
  53 }
  54
  55 static struct irq_chip core_chip = {
  56         .name           = "core",
  57         .irq_mask       = mask_core_irq,
  58         .irq_unmask     = unmask_core_irq,
  59 };
  60
  61 asmlinkage void c6x_do_IRQ(unsigned int prio, struct pt_regs *regs)
  62 {
  63         struct pt_regs *old_regs = set_irq_regs(regs);
  64
  65         irq_enter();
  66
  67         BUG_ON(prio < 4 || prio >= NR_PRIORITY_IRQS);
  68
  69         generic_handle_irq(prio);
  70
  71         irq_exit();
  72
  73         set_irq_regs(old_regs);
  74 }
  75
  76 static struct irq_host *core_host;
  77
  78 static int core_host_map(struct irq_host *h, unsigned int virq,
  79                          irq_hw_number_t hw)
  80 {
  81         if (hw < 4 || hw >= NR_PRIORITY_IRQS)
  82                 return -EINVAL;
  83
  84         irq_set_status_flags(virq, IRQ_LEVEL);
  85         irq_set_chip_and_handler(virq, &core_chip, handle_level_irq);
  86         return 0;
  87 }
  88
  89 static struct irq_host_ops core_host_ops = {
  90         .map = core_host_map,
  91 };
  92
  93 void __init init_IRQ(void)
  94 {
  95         struct device_node *np;
  96
  97         /* Mask all priority IRQs */
  98         and_creg(IER, ~0xfff0);
  99
 100         np = of_find_compatible_node(NULL, NULL, "ti,c64x+core-pic");
 101         if (np != NULL) {
 102                 /* create the core host */
 103                 core_host = irq_alloc_host(np, IRQ_HOST_MAP_PRIORITY, 0,
 104                                            &core_host_ops, 0);
 105                 if (core_host)
 106                         irq_set_default_host(core_host);
 107                 of_node_put(np);
 108         }
 109
 110         printk(KERN_INFO "Core interrupt controller initialized\n");
 111
 112         /* now we're ready for other SoC controllers */
 113         megamod_pic_init();
 114
 115         /* Clear all general IRQ flags */
 116         set_creg(ICR, 0xfff0);
 117 }
 118
 119 void ack_bad_irq(int irq)
 120 {
 121         printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
 122         irq_err_count++;
 123 }
 124
 125 int arch_show_interrupts(struct seq_file *p, int prec)
 126 {
 127         seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
 128         return 0;
 129 }
 130
 131 /*
 132  * IRQ controller and virtual interrupts
 133  */
 134
 135 /* The main irq map itself is an array of NR_IRQ entries containing the
 136  * associate host and irq number. An entry with a host of NULL is free.
 137  * An entry can be allocated if it's free, the allocator always then sets
 138  * hwirq first to the host's invalid irq number and then fills ops.
 139  */
 140 struct irq_map_entry {
 141         irq_hw_number_t hwirq;
 142         struct irq_host *host;
 143 };
 144
 145 static LIST_HEAD(irq_hosts);
 146 static DEFINE_RAW_SPINLOCK(irq_big_lock);
 147 static DEFINE_MUTEX(revmap_trees_mutex);
 148 static struct irq_map_entry irq_map[NR_IRQS];
 149 static unsigned int irq_virq_count = NR_IRQS;
 150 static struct irq_host *irq_default_host;
 151
 152 irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
 153 {
 154         return irq_map[d->irq].hwirq;
 155 }
 156 EXPORT_SYMBOL_GPL(irqd_to_hwirq);
 157
 158 irq_hw_number_t virq_to_hw(unsigned int virq)
 159 {
 160         return irq_map[virq].hwirq;
 161 }
 162 EXPORT_SYMBOL_GPL(virq_to_hw);
 163
 164 bool virq_is_host(unsigned int virq, struct irq_host *host)
 165 {
 166         return irq_map[virq].host == host;
 167 }
 168 EXPORT_SYMBOL_GPL(virq_is_host);
 169
 170 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
 171 {
 172         return h->of_node != NULL && h->of_node == np;
 173 }
 174
 175 struct irq_host *irq_alloc_host(struct device_node *of_node,
 176                                 unsigned int revmap_type,
 177                                 unsigned int revmap_arg,
 178                                 struct irq_host_ops *ops,
 179                                 irq_hw_number_t inval_irq)
 180 {
 181         struct irq_host *host;
 182         unsigned int size = sizeof(struct irq_host);
 183         unsigned int i;
 184         unsigned int *rmap;
 185         unsigned long flags;
 186
 187         /* Allocate structure and revmap table if using linear mapping */
 188         if (revmap_type == IRQ_HOST_MAP_LINEAR)
 189                 size += revmap_arg * sizeof(unsigned int);
 190         host = kzalloc(size, GFP_KERNEL);
 191         if (host == NULL)
 192                 return NULL;
 193
 194         /* Fill structure */
 195         host->revmap_type = revmap_type;
 196         host->inval_irq = inval_irq;
 197         host->ops = ops;
 198         host->of_node = of_node_get(of_node);
 199
 200         if (host->ops->match == NULL)
 201                 host->ops->match = default_irq_host_match;
 202
 203         raw_spin_lock_irqsave(&irq_big_lock, flags);
 204
 205         /* Check for the priority controller. */
 206         if (revmap_type == IRQ_HOST_MAP_PRIORITY) {
 207                 if (irq_map[0].host != NULL) {
 208                         raw_spin_unlock_irqrestore(&irq_big_lock, flags);
 209                         of_node_put(host->of_node);
 210                         kfree(host);
 211                         return NULL;
 212                 }
 213                 irq_map[0].host = host;
 214         }
 215
 216         list_add(&host->link, &irq_hosts);
 217         raw_spin_unlock_irqrestore(&irq_big_lock, flags);
 218
 219         /* Additional setups per revmap type */
 220         switch (revmap_type) {
 221         case IRQ_HOST_MAP_PRIORITY:
 222                 /* 0 is always the invalid number for priority */
 223                 host->inval_irq = 0;
 224                 /* setup us as the host for all priority interrupts */
 225                 for (i = 1; i < NR_PRIORITY_IRQS; i++) {
 226                         irq_map[i].hwirq = i;
 227                         smp_wmb();
 228                         irq_map[i].host = host;
 229                         smp_wmb();
 230
 231                         ops->map(host, i, i);
 232                 }
 233                 break;
 234         case IRQ_HOST_MAP_LINEAR:
 235                 rmap = (unsigned int *)(host + 1);
 236                 for (i = 0; i < revmap_arg; i++)
 237                         rmap[i] = NO_IRQ;
 238                 host->revmap_data.linear.size = revmap_arg;
 239                 smp_wmb();
 240                 host->revmap_data.linear.revmap = rmap;
 241                 break;
 242         case IRQ_HOST_MAP_TREE:
 243                 INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
 244                 break;
 245         default:
 246                 break;
 247         }
 248
 249         pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
 250
 251         return host;
 252 }
 253
 254 struct irq_host *irq_find_host(struct device_node *node)
 255 {
 256         struct irq_host *h, *found = NULL;
 257         unsigned long flags;
 258
 259         /* We might want to match the legacy controller last since
 260          * it might potentially be set to match all interrupts in
 261          * the absence of a device node. This isn't a problem so far
 262          * yet though...
 263          */
 264         raw_spin_lock_irqsave(&irq_big_lock, flags);
 265         list_for_each_entry(h, &irq_hosts, link)
 266                 if (h->ops->match(h, node)) {
 267                         found = h;
 268                         break;
 269                 }
 270         raw_spin_unlock_irqrestore(&irq_big_lock, flags);
 271         return found;
 272 }
 273 EXPORT_SYMBOL_GPL(irq_find_host);
 274
 275 void irq_set_default_host(struct irq_host *host)
 276 {
 277         pr_debug("irq: Default host set to @0x%p\n", host);
 278
 279         irq_default_host = host;
 280 }
 281
 282 void irq_set_virq_count(unsigned int count)
 283 {
 284         pr_debug("irq: Trying to set virq count to %d\n", count);
 285
 286         BUG_ON(count < NR_PRIORITY_IRQS);
 287         if (count < NR_IRQS)
 288                 irq_virq_count = count;
 289 }
 290
 291 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
 292                             irq_hw_number_t hwirq)
 293 {
 294         int res;
 295
 296         res = irq_alloc_desc_at(virq, 0);
 297         if (res != virq) {
 298                 pr_debug("irq: -> allocating desc failed\n");
 299                 goto error;
 300         }
 301
 302         /* map it */
 303         smp_wmb();
 304         irq_map[virq].hwirq = hwirq;
 305         smp_mb();
 306
 307         if (host->ops->map(host, virq, hwirq)) {
 308                 pr_debug("irq: -> mapping failed, freeing\n");
 309                 goto errdesc;
 310         }
 311
 312         irq_clear_status_flags(virq, IRQ_NOREQUEST);
 313
 314         return 0;
 315
 316 errdesc:
 317         irq_free_descs(virq, 1);
 318 error:
 319         irq_free_virt(virq, 1);
 320         return -1;
 321 }
 322
 323 unsigned int irq_create_direct_mapping(struct irq_host *host)
 324 {
 325         unsigned int virq;
 326
 327         if (host == NULL)
 328                 host = irq_default_host;
 329
 330         BUG_ON(host == NULL);
 331         WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
 332
 333         virq = irq_alloc_virt(host, 1, 0);
 334         if (virq == NO_IRQ) {
 335                 pr_debug("irq: create_direct virq allocation failed\n");
 336                 return NO_IRQ;
 337         }
 338
 339         pr_debug("irq: create_direct obtained virq %d\n", virq);
 340
 341         if (irq_setup_virq(host, virq, virq))
 342                 return NO_IRQ;
 343
 344         return virq;
 345 }
 346
 347 unsigned int irq_create_mapping(struct irq_host *host,
 348                                 irq_hw_number_t hwirq)
 349 {
 350         unsigned int virq, hint;
 351
 352         pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
 353
 354         /* Look for default host if nececssary */
 355         if (host == NULL)
 356                 host = irq_default_host;
 357         if (host == NULL) {
 358                 printk(KERN_WARNING "irq_create_mapping called for"
 359                        " NULL host, hwirq=%lx\n", hwirq);
 360                 WARN_ON(1);
 361                 return NO_IRQ;
 362         }
 363         pr_debug("irq: -> using host @%p\n", host);
 364
 365         /* Check if mapping already exists */
 366         virq = irq_find_mapping(host, hwirq);
 367         if (virq != NO_IRQ) {
 368                 pr_debug("irq: -> existing mapping on virq %d\n", virq);
 369                 return virq;
 370         }
 371
 372         /* Allocate a virtual interrupt number */
 373         hint = hwirq % irq_virq_count;
 374         virq = irq_alloc_virt(host, 1, hint);
 375         if (virq == NO_IRQ) {
 376                 pr_debug("irq: -> virq allocation failed\n");
 377                 return NO_IRQ;
 378         }
 379
 380         if (irq_setup_virq(host, virq, hwirq))
 381                 return NO_IRQ;
 382
 383         pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
 384                 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
 385
 386         return virq;
 387 }
 388 EXPORT_SYMBOL_GPL(irq_create_mapping);
 389
 390 unsigned int irq_create_of_mapping(struct device_node *controller,
 391                                    const u32 *intspec, unsigned int intsize)
 392 {
 393         struct irq_host *host;
 394         irq_hw_number_t hwirq;
 395         unsigned int type = IRQ_TYPE_NONE;
 396         unsigned int virq;
 397
 398         if (controller == NULL)
 399                 host = irq_default_host;
 400         else
 401                 host = irq_find_host(controller);
 402         if (host == NULL) {
 403                 printk(KERN_WARNING "irq: no irq host found for %s !\n",
 404                        controller->full_name);
 405                 return NO_IRQ;
 406         }
 407
 408         /* If host has no translation, then we assume interrupt line */
 409         if (host->ops->xlate == NULL)
 410                 hwirq = intspec[0];
 411         else {
 412                 if (host->ops->xlate(host, controller, intspec, intsize,
 413                                      &hwirq, &type))
 414                         return NO_IRQ;
 415         }
 416
 417         /* Create mapping */
 418         virq = irq_create_mapping(host, hwirq);
 419         if (virq == NO_IRQ)
 420                 return virq;
 421
 422         /* Set type if specified and different than the current one */
 423         if (type != IRQ_TYPE_NONE &&
 424             type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
 425                 irq_set_irq_type(virq, type);
 426         return virq;
 427 }
 428 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 429
 430 void irq_dispose_mapping(unsigned int virq)
 431 {
 432         struct irq_host *host;
 433         irq_hw_number_t hwirq;
 434
 435         if (virq == NO_IRQ)
 436                 return;
 437
 438         /* Never unmap priority interrupts */
 439         if (virq < NR_PRIORITY_IRQS)
 440                 return;
 441
 442         host = irq_map[virq].host;
 443         if (WARN_ON(host == NULL))
 444                 return;
 445
 446         irq_set_status_flags(virq, IRQ_NOREQUEST);
 447
 448         /* remove chip and handler */
 449         irq_set_chip_and_handler(virq, NULL, NULL);
 450
 451         /* Make sure it's completed */
 452         synchronize_irq(virq);
 453
 454         /* Tell the PIC about it */
 455         if (host->ops->unmap)
 456                 host->ops->unmap(host, virq);
 457         smp_mb();
 458
 459         /* Clear reverse map */
 460         hwirq = irq_map[virq].hwirq;
 461         switch (host->revmap_type) {
 462         case IRQ_HOST_MAP_LINEAR:
 463                 if (hwirq < host->revmap_data.linear.size)
 464                         host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
 465                 break;
 466         case IRQ_HOST_MAP_TREE:
 467                 mutex_lock(&revmap_trees_mutex);
 468                 radix_tree_delete(&host->revmap_data.tree, hwirq);
 469                 mutex_unlock(&revmap_trees_mutex);
 470                 break;
 471         }
 472
 473         /* Destroy map */
 474         smp_mb();
 475         irq_map[virq].hwirq = host->inval_irq;
 476
 477         irq_free_descs(virq, 1);
 478         /* Free it */
 479         irq_free_virt(virq, 1);
 480 }
 481 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 482
 483 unsigned int irq_find_mapping(struct irq_host *host,
 484                               irq_hw_number_t hwirq)
 485 {
 486         unsigned int i;
 487         unsigned int hint = hwirq % irq_virq_count;
 488
 489         /* Look for default host if nececssary */
 490         if (host == NULL)
 491                 host = irq_default_host;
 492         if (host == NULL)
 493                 return NO_IRQ;
 494
 495         /* Slow path does a linear search of the map */
 496         i = hint;
 497         do  {
 498                 if (irq_map[i].host == host &&
 499                     irq_map[i].hwirq == hwirq)
 500                         return i;
 501                 i++;
 502                 if (i >= irq_virq_count)
 503                         i = 4;
 504         } while (i != hint);
 505         return NO_IRQ;
 506 }
 507 EXPORT_SYMBOL_GPL(irq_find_mapping);
 508
 509 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
 510                                      irq_hw_number_t hwirq)
 511 {
 512         struct irq_map_entry *ptr;
 513         unsigned int virq;
 514
 515         if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
 516                 return irq_find_mapping(host, hwirq);
 517
 518         /*
 519          * The ptr returned references the static global irq_map.
 520          * but freeing an irq can delete nodes along the path to
 521          * do the lookup via call_rcu.
 522          */
 523         rcu_read_lock();
 524         ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
 525         rcu_read_unlock();
 526
 527         /*
 528          * If found in radix tree, then fine.
 529          * Else fallback to linear lookup - this should not happen in practice
 530          * as it means that we failed to insert the node in the radix tree.
 531          */
 532         if (ptr)
 533                 virq = ptr - irq_map;
 534         else
 535                 virq = irq_find_mapping(host, hwirq);
 536
 537         return virq;
 538 }
 539
 540 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
 541                              irq_hw_number_t hwirq)
 542 {
 543         if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
 544                 return;
 545
 546         if (virq != NO_IRQ) {
 547                 mutex_lock(&revmap_trees_mutex);
 548                 radix_tree_insert(&host->revmap_data.tree, hwirq,
 549                                   &irq_map[virq]);
 550                 mutex_unlock(&revmap_trees_mutex);
 551         }
 552 }
 553
 554 unsigned int irq_linear_revmap(struct irq_host *host,
 555                                irq_hw_number_t hwirq)
 556 {
 557         unsigned int *revmap;
 558
 559         if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
 560                 return irq_find_mapping(host, hwirq);
 561
 562         /* Check revmap bounds */
 563         if (unlikely(hwirq >= host->revmap_data.linear.size))
 564                 return irq_find_mapping(host, hwirq);
 565
 566         /* Check if revmap was allocated */
 567         revmap = host->revmap_data.linear.revmap;
 568         if (unlikely(revmap == NULL))
 569                 return irq_find_mapping(host, hwirq);
 570
 571         /* Fill up revmap with slow path if no mapping found */
 572         if (unlikely(revmap[hwirq] == NO_IRQ))
 573                 revmap[hwirq] = irq_find_mapping(host, hwirq);
 574
 575         return revmap[hwirq];
 576 }
 577
 578 unsigned int irq_alloc_virt(struct irq_host *host,
 579                             unsigned int count,
 580                             unsigned int hint)
 581 {
 582         unsigned long flags;
 583         unsigned int i, j, found = NO_IRQ;
 584
 585         if (count == 0 || count > (irq_virq_count - NR_PRIORITY_IRQS))
 586                 return NO_IRQ;
 587
 588         raw_spin_lock_irqsave(&irq_big_lock, flags);
 589
 590         /* Use hint for 1 interrupt if any */
 591         if (count == 1 && hint >= NR_PRIORITY_IRQS &&
 592             hint < irq_virq_count && irq_map[hint].host == NULL) {
 593                 found = hint;
 594                 goto hint_found;
 595         }
 596
 597         /* Look for count consecutive numbers in the allocatable
 598          * (non-legacy) space
 599          */
 600         for (i = NR_PRIORITY_IRQS, j = 0; i < irq_virq_count; i++) {
 601                 if (irq_map[i].host != NULL)
 602                         j = 0;
 603                 else
 604                         j++;
 605
 606                 if (j == count) {
 607                         found = i - count + 1;
 608                         break;
 609                 }
 610         }
 611         if (found == NO_IRQ) {
 612                 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
 613                 return NO_IRQ;
 614         }
 615  hint_found:
 616         for (i = found; i < (found + count); i++) {
 617                 irq_map[i].hwirq = host->inval_irq;
 618                 smp_wmb();
 619                 irq_map[i].host = host;
 620         }
 621         raw_spin_unlock_irqrestore(&irq_big_lock, flags);
 622         return found;
 623 }
 624
 625 void irq_free_virt(unsigned int virq, unsigned int count)
 626 {
 627         unsigned long flags;
 628         unsigned int i;
 629
 630         WARN_ON(virq < NR_PRIORITY_IRQS);
 631         WARN_ON(count == 0 || (virq + count) > irq_virq_count);
 632
 633         if (virq < NR_PRIORITY_IRQS) {
 634                 if (virq + count < NR_PRIORITY_IRQS)
 635                         return;
 636                 count  -= NR_PRIORITY_IRQS - virq;
 637                 virq = NR_PRIORITY_IRQS;
 638         }
 639
 640         if (count > irq_virq_count || virq > irq_virq_count - count) {
 641                 if (virq > irq_virq_count)
 642                         return;
 643                 count = irq_virq_count - virq;
 644         }
 645
 646         raw_spin_lock_irqsave(&irq_big_lock, flags);
 647         for (i = virq; i < (virq + count); i++) {
 648                 struct irq_host *host;
 649
 650                 host = irq_map[i].host;
 651                 irq_map[i].hwirq = host->inval_irq;
 652                 smp_wmb();
 653                 irq_map[i].host = NULL;
 654         }
 655         raw_spin_unlock_irqrestore(&irq_big_lock, flags);
 656 }
 657
 658 #ifdef CONFIG_VIRQ_DEBUG
 659 static int virq_debug_show(struct seq_file *m, void *private)
 660 {
 661         unsigned long flags;
 662         struct irq_desc *desc;
 663         const char *p;
 664         static const char none[] = "none";
 665         void *data;
 666         int i;
 667
 668         seq_printf(m, "%-5s  %-7s  %-15s  %-18s  %s\n", "virq", "hwirq",
 669                       "chip name", "chip data", "host name");
 670
 671         for (i = 1; i < nr_irqs; i++) {
 672                 desc = irq_to_desc(i);
 673                 if (!desc)
 674                         continue;
 675
 676                 raw_spin_lock_irqsave(&desc->lock, flags);
 677
 678                 if (desc->action && desc->action->handler) {
 679                         struct irq_chip *chip;
 680
 681                         seq_printf(m, "%5d  ", i);
 682                         seq_printf(m, "0x%05lx  ", irq_map[i].hwirq);
 683
 684                         chip = irq_desc_get_chip(desc);
 685                         if (chip && chip->name)
 686                                 p = chip->name;
 687                         else
 688                                 p = none;
 689                         seq_printf(m, "%-15s  ", p);
 690
 691                         data = irq_desc_get_chip_data(desc);
 692                         seq_printf(m, "0x%16p  ", data);
 693
 694                         if (irq_map[i].host && irq_map[i].host->of_node)
 695                                 p = irq_map[i].host->of_node->full_name;
 696                         else
 697                                 p = none;
 698                         seq_printf(m, "%s\n", p);
 699                 }
 700
 701                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 702         }
 703
 704         return 0;
 705 }
 706
 707 static int virq_debug_open(struct inode *inode, struct file *file)
 708 {
 709         return single_open(file, virq_debug_show, inode->i_private);
 710 }
 711
 712 static const struct file_operations virq_debug_fops = {
 713         .open = virq_debug_open,
 714         .read = seq_read,
 715         .llseek = seq_lseek,
 716         .release = single_release,
 717 };
 718
 719 static int __init irq_debugfs_init(void)
 720 {
 721         if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
 722                                  NULL, &virq_debug_fops) == NULL)
 723                 return -ENOMEM;
 724
 725         return 0;
 726 }
 727 device_initcall(irq_debugfs_init);
 728 #endif /* CONFIG_VIRQ_DEBUG */