kernel/irq/chip.c

   1 /*
   2  * linux/kernel/irq/chip.c
   3  *
   4  * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
   5  * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
   6  *
   7  * This file contains the core interrupt handling code, for irq-chip
   8  * based architectures.
   9  *
  10  * Detailed information is available in Documentation/DocBook/genericirq
  11  */
  12
  13 #include <linux/irq.h>
  14 #include <linux/msi.h>
  15 #include <linux/module.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel_stat.h>
  18
  19 #include "internals.h"
  20
  21 /**
  22  *      irq_set_chip - set the irq chip for an irq
  23  *      @irq:   irq number
  24  *      @chip:  pointer to irq chip description structure
  25  */
  26 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
  27 {
  28         struct irq_desc *desc = irq_to_desc(irq);
  29         unsigned long flags;
  30
  31         if (!desc) {
  32                 WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq);
  33                 return -EINVAL;
  34         }
  35
  36         if (!chip)
  37                 chip = &no_irq_chip;
  38
  39         raw_spin_lock_irqsave(&desc->lock, flags);
  40         irq_chip_set_defaults(chip);
  41         desc->irq_data.chip = chip;
  42         raw_spin_unlock_irqrestore(&desc->lock, flags);
  43
  44         return 0;
  45 }
  46 EXPORT_SYMBOL(irq_set_chip);
  47
  48 /**
  49  *      irq_set_type - set the irq trigger type for an irq
  50  *      @irq:   irq number
  51  *      @type:  IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
  52  */
  53 int irq_set_irq_type(unsigned int irq, unsigned int type)
  54 {
  55         struct irq_desc *desc = irq_to_desc(irq);
  56         unsigned long flags;
  57         int ret = -ENXIO;
  58
  59         if (!desc) {
  60                 printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
  61                 return -ENODEV;
  62         }
  63
  64         type &= IRQ_TYPE_SENSE_MASK;
  65         if (type == IRQ_TYPE_NONE)
  66                 return 0;
  67
  68         chip_bus_lock(desc);
  69         raw_spin_lock_irqsave(&desc->lock, flags);
  70         ret = __irq_set_trigger(desc, irq, type);
  71         raw_spin_unlock_irqrestore(&desc->lock, flags);
  72         chip_bus_sync_unlock(desc);
  73         return ret;
  74 }
  75 EXPORT_SYMBOL(irq_set_irq_type);
  76
  77 /**
  78  *      irq_set_handler_data - set irq handler data for an irq
  79  *      @irq:   Interrupt number
  80  *      @data:  Pointer to interrupt specific data
  81  *
  82  *      Set the hardware irq controller data for an irq
  83  */
  84 int irq_set_handler_data(unsigned int irq, void *data)
  85 {
  86         struct irq_desc *desc = irq_to_desc(irq);
  87         unsigned long flags;
  88
  89         if (!desc) {
  90                 printk(KERN_ERR
  91                        "Trying to install controller data for IRQ%d\n", irq);
  92                 return -EINVAL;
  93         }
  94
  95         raw_spin_lock_irqsave(&desc->lock, flags);
  96         desc->irq_data.handler_data = data;
  97         raw_spin_unlock_irqrestore(&desc->lock, flags);
  98         return 0;
  99 }
 100 EXPORT_SYMBOL(irq_set_handler_data);
 101
 102 /**
 103  *      irq_set_msi_desc - set MSI descriptor data for an irq
 104  *      @irq:   Interrupt number
 105  *      @entry: Pointer to MSI descriptor data
 106  *
 107  *      Set the MSI descriptor entry for an irq
 108  */
 109 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
 110 {
 111         struct irq_desc *desc = irq_to_desc(irq);
 112         unsigned long flags;
 113
 114         if (!desc) {
 115                 printk(KERN_ERR
 116                        "Trying to install msi data for IRQ%d\n", irq);
 117                 return -EINVAL;
 118         }
 119
 120         raw_spin_lock_irqsave(&desc->lock, flags);
 121         desc->irq_data.msi_desc = entry;
 122         if (entry)
 123                 entry->irq = irq;
 124         raw_spin_unlock_irqrestore(&desc->lock, flags);
 125         return 0;
 126 }
 127
 128 /**
 129  *      irq_set_chip_data - set irq chip data for an irq
 130  *      @irq:   Interrupt number
 131  *      @data:  Pointer to chip specific data
 132  *
 133  *      Set the hardware irq chip data for an irq
 134  */
 135 int irq_set_chip_data(unsigned int irq, void *data)
 136 {
 137         struct irq_desc *desc = irq_to_desc(irq);
 138         unsigned long flags;
 139
 140         if (!desc) {
 141                 printk(KERN_ERR
 142                        "Trying to install chip data for IRQ%d\n", irq);
 143                 return -EINVAL;
 144         }
 145
 146         if (!desc->irq_data.chip) {
 147                 printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
 148                 return -EINVAL;
 149         }
 150
 151         raw_spin_lock_irqsave(&desc->lock, flags);
 152         desc->irq_data.chip_data = data;
 153         raw_spin_unlock_irqrestore(&desc->lock, flags);
 154
 155         return 0;
 156 }
 157 EXPORT_SYMBOL(irq_set_chip_data);
 158
 159 struct irq_data *irq_get_irq_data(unsigned int irq)
 160 {
 161         struct irq_desc *desc = irq_to_desc(irq);
 162
 163         return desc ? &desc->irq_data : NULL;
 164 }
 165 EXPORT_SYMBOL_GPL(irq_get_irq_data);
 166
 167 static void irq_state_clr_disabled(struct irq_desc *desc)
 168 {
 169         desc->istate &= ~IRQS_DISABLED;
 170         irq_compat_clr_disabled(desc);
 171 }
 172
 173 static void irq_state_set_disabled(struct irq_desc *desc)
 174 {
 175         desc->istate |= IRQS_DISABLED;
 176         irq_compat_set_disabled(desc);
 177 }
 178
 179 int irq_startup(struct irq_desc *desc)
 180 {
 181         irq_state_clr_disabled(desc);
 182         desc->depth = 0;
 183
 184         if (desc->irq_data.chip->irq_startup) {
 185                 int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
 186                 desc->status &= ~IRQ_MASKED;
 187                 return ret;
 188         }
 189
 190         irq_enable(desc);
 191         return 0;
 192 }
 193
 194 void irq_shutdown(struct irq_desc *desc)
 195 {
 196         irq_state_set_disabled(desc);
 197         desc->depth = 1;
 198         if (desc->irq_data.chip->irq_shutdown)
 199                 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
 200         if (desc->irq_data.chip->irq_disable)
 201                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 202         else
 203                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 204         desc->status |= IRQ_MASKED;
 205 }
 206
 207 void irq_enable(struct irq_desc *desc)
 208 {
 209         irq_state_clr_disabled(desc);
 210         if (desc->irq_data.chip->irq_enable)
 211                 desc->irq_data.chip->irq_enable(&desc->irq_data);
 212         else
 213                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 214         desc->status &= ~IRQ_MASKED;
 215 }
 216
 217 void irq_disable(struct irq_desc *desc)
 218 {
 219         irq_state_set_disabled(desc);
 220         if (desc->irq_data.chip->irq_disable) {
 221                 desc->irq_data.chip->irq_disable(&desc->irq_data);
 222                 desc->status |= IRQ_MASKED;
 223         }
 224 }
 225
 226 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
 227 /* Temporary migration helpers */
 228 static void compat_irq_mask(struct irq_data *data)
 229 {
 230         data->chip->mask(data->irq);
 231 }
 232
 233 static void compat_irq_unmask(struct irq_data *data)
 234 {
 235         data->chip->unmask(data->irq);
 236 }
 237
 238 static void compat_irq_ack(struct irq_data *data)
 239 {
 240         data->chip->ack(data->irq);
 241 }
 242
 243 static void compat_irq_mask_ack(struct irq_data *data)
 244 {
 245         data->chip->mask_ack(data->irq);
 246 }
 247
 248 static void compat_irq_eoi(struct irq_data *data)
 249 {
 250         data->chip->eoi(data->irq);
 251 }
 252
 253 static void compat_irq_enable(struct irq_data *data)
 254 {
 255         data->chip->enable(data->irq);
 256 }
 257
 258 static void compat_irq_disable(struct irq_data *data)
 259 {
 260         data->chip->disable(data->irq);
 261 }
 262
 263 static void compat_irq_shutdown(struct irq_data *data)
 264 {
 265         data->chip->shutdown(data->irq);
 266 }
 267
 268 static unsigned int compat_irq_startup(struct irq_data *data)
 269 {
 270         return data->chip->startup(data->irq);
 271 }
 272
 273 static int compat_irq_set_affinity(struct irq_data *data,
 274                                    const struct cpumask *dest, bool force)
 275 {
 276         return data->chip->set_affinity(data->irq, dest);
 277 }
 278
 279 static int compat_irq_set_type(struct irq_data *data, unsigned int type)
 280 {
 281         return data->chip->set_type(data->irq, type);
 282 }
 283
 284 static int compat_irq_set_wake(struct irq_data *data, unsigned int on)
 285 {
 286         return data->chip->set_wake(data->irq, on);
 287 }
 288
 289 static int compat_irq_retrigger(struct irq_data *data)
 290 {
 291         return data->chip->retrigger(data->irq);
 292 }
 293
 294 static void compat_bus_lock(struct irq_data *data)
 295 {
 296         data->chip->bus_lock(data->irq);
 297 }
 298
 299 static void compat_bus_sync_unlock(struct irq_data *data)
 300 {
 301         data->chip->bus_sync_unlock(data->irq);
 302 }
 303 #endif
 304
 305 /*
 306  * Fixup enable/disable function pointers
 307  */
 308 void irq_chip_set_defaults(struct irq_chip *chip)
 309 {
 310 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
 311         if (chip->enable)
 312                 chip->irq_enable = compat_irq_enable;
 313         if (chip->disable)
 314                 chip->irq_disable = compat_irq_disable;
 315         if (chip->shutdown)
 316                 chip->irq_shutdown = compat_irq_shutdown;
 317         if (chip->startup)
 318                 chip->irq_startup = compat_irq_startup;
 319         if (!chip->end)
 320                 chip->end = dummy_irq_chip.end;
 321         if (chip->bus_lock)
 322                 chip->irq_bus_lock = compat_bus_lock;
 323         if (chip->bus_sync_unlock)
 324                 chip->irq_bus_sync_unlock = compat_bus_sync_unlock;
 325         if (chip->mask)
 326                 chip->irq_mask = compat_irq_mask;
 327         if (chip->unmask)
 328                 chip->irq_unmask = compat_irq_unmask;
 329         if (chip->ack)
 330                 chip->irq_ack = compat_irq_ack;
 331         if (chip->mask_ack)
 332                 chip->irq_mask_ack = compat_irq_mask_ack;
 333         if (chip->eoi)
 334                 chip->irq_eoi = compat_irq_eoi;
 335         if (chip->set_affinity)
 336                 chip->irq_set_affinity = compat_irq_set_affinity;
 337         if (chip->set_type)
 338                 chip->irq_set_type = compat_irq_set_type;
 339         if (chip->set_wake)
 340                 chip->irq_set_wake = compat_irq_set_wake;
 341         if (chip->retrigger)
 342                 chip->irq_retrigger = compat_irq_retrigger;
 343 #endif
 344 }
 345
 346 static inline void mask_ack_irq(struct irq_desc *desc)
 347 {
 348         if (desc->irq_data.chip->irq_mask_ack)
 349                 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
 350         else {
 351                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 352                 if (desc->irq_data.chip->irq_ack)
 353                         desc->irq_data.chip->irq_ack(&desc->irq_data);
 354         }
 355         desc->status |= IRQ_MASKED;
 356 }
 357
 358 static inline void mask_irq(struct irq_desc *desc)
 359 {
 360         if (desc->irq_data.chip->irq_mask) {
 361                 desc->irq_data.chip->irq_mask(&desc->irq_data);
 362                 desc->status |= IRQ_MASKED;
 363         }
 364 }
 365
 366 static inline void unmask_irq(struct irq_desc *desc)
 367 {
 368         if (desc->irq_data.chip->irq_unmask) {
 369                 desc->irq_data.chip->irq_unmask(&desc->irq_data);
 370                 desc->status &= ~IRQ_MASKED;
 371         }
 372 }
 373
 374 /*
 375  *      handle_nested_irq - Handle a nested irq from a irq thread
 376  *      @irq:   the interrupt number
 377  *
 378  *      Handle interrupts which are nested into a threaded interrupt
 379  *      handler. The handler function is called inside the calling
 380  *      threads context.
 381  */
 382 void handle_nested_irq(unsigned int irq)
 383 {
 384         struct irq_desc *desc = irq_to_desc(irq);
 385         struct irqaction *action;
 386         irqreturn_t action_ret;
 387
 388         might_sleep();
 389
 390         raw_spin_lock_irq(&desc->lock);
 391
 392         kstat_incr_irqs_this_cpu(irq, desc);
 393
 394         action = desc->action;
 395         if (unlikely(!action || (desc->istate & IRQS_DISABLED)))
 396                 goto out_unlock;
 397
 398         irq_compat_set_progress(desc);
 399         desc->istate |= IRQS_INPROGRESS;
 400         raw_spin_unlock_irq(&desc->lock);
 401
 402         action_ret = action->thread_fn(action->irq, action->dev_id);
 403         if (!noirqdebug)
 404                 note_interrupt(irq, desc, action_ret);
 405
 406         raw_spin_lock_irq(&desc->lock);
 407         desc->istate &= ~IRQS_INPROGRESS;
 408         irq_compat_clr_progress(desc);
 409
 410 out_unlock:
 411         raw_spin_unlock_irq(&desc->lock);
 412 }
 413 EXPORT_SYMBOL_GPL(handle_nested_irq);
 414
 415 static bool irq_check_poll(struct irq_desc *desc)
 416 {
 417         if (!(desc->istate & IRQS_POLL_INPROGRESS))
 418                 return false;
 419         return irq_wait_for_poll(desc);
 420 }
 421
 422 /**
 423  *      handle_simple_irq - Simple and software-decoded IRQs.
 424  *      @irq:   the interrupt number
 425  *      @desc:  the interrupt description structure for this irq
 426  *
 427  *      Simple interrupts are either sent from a demultiplexing interrupt
 428  *      handler or come from hardware, where no interrupt hardware control
 429  *      is necessary.
 430  *
 431  *      Note: The caller is expected to handle the ack, clear, mask and
 432  *      unmask issues if necessary.
 433  */
 434 void
 435 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 436 {
 437         raw_spin_lock(&desc->lock);
 438
 439         if (unlikely(desc->istate & IRQS_INPROGRESS))
 440                 if (!irq_check_poll(desc))
 441                         goto out_unlock;
 442
 443         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 444         kstat_incr_irqs_this_cpu(irq, desc);
 445
 446         if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED)))
 447                 goto out_unlock;
 448
 449         handle_irq_event(desc);
 450
 451 out_unlock:
 452         raw_spin_unlock(&desc->lock);
 453 }
 454
 455 /**
 456  *      handle_level_irq - Level type irq handler
 457  *      @irq:   the interrupt number
 458  *      @desc:  the interrupt description structure for this irq
 459  *
 460  *      Level type interrupts are active as long as the hardware line has
 461  *      the active level. This may require to mask the interrupt and unmask
 462  *      it after the associated handler has acknowledged the device, so the
 463  *      interrupt line is back to inactive.
 464  */
 465 void
 466 handle_level_irq(unsigned int irq, struct irq_desc *desc)
 467 {
 468         raw_spin_lock(&desc->lock);
 469         mask_ack_irq(desc);
 470
 471         if (unlikely(desc->istate & IRQS_INPROGRESS))
 472                 if (!irq_check_poll(desc))
 473                         goto out_unlock;
 474
 475         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 476         kstat_incr_irqs_this_cpu(irq, desc);
 477
 478         /*
 479          * If its disabled or no action available
 480          * keep it masked and get out of here
 481          */
 482         if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED)))
 483                 goto out_unlock;
 484
 485         handle_irq_event(desc);
 486
 487         if (!(desc->istate & (IRQS_DISABLED | IRQS_ONESHOT)))
 488                 unmask_irq(desc);
 489 out_unlock:
 490         raw_spin_unlock(&desc->lock);
 491 }
 492 EXPORT_SYMBOL_GPL(handle_level_irq);
 493
 494 /**
 495  *      handle_fasteoi_irq - irq handler for transparent controllers
 496  *      @irq:   the interrupt number
 497  *      @desc:  the interrupt description structure for this irq
 498  *
 499  *      Only a single callback will be issued to the chip: an ->eoi()
 500  *      call when the interrupt has been serviced. This enables support
 501  *      for modern forms of interrupt handlers, which handle the flow
 502  *      details in hardware, transparently.
 503  */
 504 void
 505 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 506 {
 507         raw_spin_lock(&desc->lock);
 508
 509         if (unlikely(desc->istate & IRQS_INPROGRESS))
 510                 if (!irq_check_poll(desc))
 511                         goto out;
 512
 513         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 514         kstat_incr_irqs_this_cpu(irq, desc);
 515
 516         /*
 517          * If its disabled or no action available
 518          * then mask it and get out of here:
 519          */
 520         if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED))) {
 521                 irq_compat_set_pending(desc);
 522                 desc->istate |= IRQS_PENDING;
 523                 mask_irq(desc);
 524                 goto out;
 525         }
 526         handle_irq_event(desc);
 527 out:
 528         desc->irq_data.chip->irq_eoi(&desc->irq_data);
 529         raw_spin_unlock(&desc->lock);
 530 }
 531
 532 /**
 533  *      handle_edge_irq - edge type IRQ handler
 534  *      @irq:   the interrupt number
 535  *      @desc:  the interrupt description structure for this irq
 536  *
 537  *      Interrupt occures on the falling and/or rising edge of a hardware
 538  *      signal. The occurence is latched into the irq controller hardware
 539  *      and must be acked in order to be reenabled. After the ack another
 540  *      interrupt can happen on the same source even before the first one
 541  *      is handled by the associated event handler. If this happens it
 542  *      might be necessary to disable (mask) the interrupt depending on the
 543  *      controller hardware. This requires to reenable the interrupt inside
 544  *      of the loop which handles the interrupts which have arrived while
 545  *      the handler was running. If all pending interrupts are handled, the
 546  *      loop is left.
 547  */
 548 void
 549 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 550 {
 551         raw_spin_lock(&desc->lock);
 552
 553         desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 554         /*
 555          * If we're currently running this IRQ, or its disabled,
 556          * we shouldn't process the IRQ. Mark it pending, handle
 557          * the necessary masking and go out
 558          */
 559         if (unlikely((desc->istate & (IRQS_DISABLED | IRQS_INPROGRESS) ||
 560                       !desc->action))) {
 561                 if (!irq_check_poll(desc)) {
 562                         irq_compat_set_pending(desc);
 563                         desc->istate |= IRQS_PENDING;
 564                         mask_ack_irq(desc);
 565                         goto out_unlock;
 566                 }
 567         }
 568         kstat_incr_irqs_this_cpu(irq, desc);
 569
 570         /* Start handling the irq */
 571         desc->irq_data.chip->irq_ack(&desc->irq_data);
 572
 573         do {
 574                 if (unlikely(!desc->action)) {
 575                         mask_irq(desc);
 576                         goto out_unlock;
 577                 }
 578
 579                 /*
 580                  * When another irq arrived while we were handling
 581                  * one, we could have masked the irq.
 582                  * Renable it, if it was not disabled in meantime.
 583                  */
 584                 if (unlikely(desc->istate & IRQS_PENDING)) {
 585                         if (!(desc->istate & IRQS_DISABLED) &&
 586                             (desc->status & IRQ_MASKED))
 587                                 unmask_irq(desc);
 588                 }
 589
 590                 handle_irq_event(desc);
 591
 592         } while ((desc->istate & IRQS_PENDING) &&
 593                  !(desc->istate & IRQS_DISABLED));
 594
 595 out_unlock:
 596         raw_spin_unlock(&desc->lock);
 597 }
 598
 599 /**
 600  *      handle_percpu_irq - Per CPU local irq handler
 601  *      @irq:   the interrupt number
 602  *      @desc:  the interrupt description structure for this irq
 603  *
 604  *      Per CPU interrupts on SMP machines without locking requirements
 605  */
 606 void
 607 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 608 {
 609         struct irq_chip *chip = irq_desc_get_chip(desc);
 610
 611         kstat_incr_irqs_this_cpu(irq, desc);
 612
 613         if (chip->irq_ack)
 614                 chip->irq_ack(&desc->irq_data);
 615
 616         handle_irq_event_percpu(desc, desc->action);
 617
 618         if (chip->irq_eoi)
 619                 chip->irq_eoi(&desc->irq_data);
 620 }
 621
 622 void
 623 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 624                   const char *name)
 625 {
 626         struct irq_desc *desc = irq_to_desc(irq);
 627         unsigned long flags;
 628
 629         if (!desc) {
 630                 printk(KERN_ERR
 631                        "Trying to install type control for IRQ%d\n", irq);
 632                 return;
 633         }
 634
 635         if (!handle)
 636                 handle = handle_bad_irq;
 637         else if (desc->irq_data.chip == &no_irq_chip) {
 638                 printk(KERN_WARNING "Trying to install %sinterrupt handler "
 639                        "for IRQ%d\n", is_chained ? "chained " : "", irq);
 640                 /*
 641                  * Some ARM implementations install a handler for really dumb
 642                  * interrupt hardware without setting an irq_chip. This worked
 643                  * with the ARM no_irq_chip but the check in setup_irq would
 644                  * prevent us to setup the interrupt at all. Switch it to
 645                  * dummy_irq_chip for easy transition.
 646                  */
 647                 desc->irq_data.chip = &dummy_irq_chip;
 648         }
 649
 650         chip_bus_lock(desc);
 651         raw_spin_lock_irqsave(&desc->lock, flags);
 652
 653         /* Uninstall? */
 654         if (handle == handle_bad_irq) {
 655                 if (desc->irq_data.chip != &no_irq_chip)
 656                         mask_ack_irq(desc);
 657                 irq_compat_set_disabled(desc);
 658                 desc->istate |= IRQS_DISABLED;
 659                 desc->depth = 1;
 660         }
 661         desc->handle_irq = handle;
 662         desc->name = name;
 663
 664         if (handle != handle_bad_irq && is_chained) {
 665                 desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
 666                 irq_startup(desc);
 667         }
 668         raw_spin_unlock_irqrestore(&desc->lock, flags);
 669         chip_bus_sync_unlock(desc);
 670 }
 671 EXPORT_SYMBOL_GPL(__set_irq_handler);
 672
 673 void
 674 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 675                          irq_flow_handler_t handle)
 676 {
 677         irq_set_chip(irq, chip);
 678         __set_irq_handler(irq, handle, 0, NULL);
 679 }
 680
 681 void
 682 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 683                               irq_flow_handler_t handle, const char *name)
 684 {
 685         irq_set_chip(irq, chip);
 686         __set_irq_handler(irq, handle, 0, name);
 687 }
 688
 689 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 690 {
 691         struct irq_desc *desc = irq_to_desc(irq);
 692         unsigned long flags;
 693
 694         if (!desc)
 695                 return;
 696
 697         /* Sanitize flags */
 698         set &= IRQF_MODIFY_MASK;
 699         clr &= IRQF_MODIFY_MASK;
 700
 701         raw_spin_lock_irqsave(&desc->lock, flags);
 702         desc->status &= ~clr;
 703         desc->status |= set;
 704         raw_spin_unlock_irqrestore(&desc->lock, flags);
 705 }