include/linux/irq.h

   1 #ifndef _LINUX_IRQ_H
   2 #define _LINUX_IRQ_H
   3
   4 /*
   5  * Please do not include this file in generic code.  There is currently
   6  * no requirement for any architecture to implement anything held
   7  * within this file.
   8  *
   9  * Thanks. --rmk
  10  */
  11
  12 #include <linux/smp.h>
  13 #include <linux/linkage.h>
  14 #include <linux/cache.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/cpumask.h>
  17 #include <linux/gfp.h>
  18 #include <linux/irqreturn.h>
  19 #include <linux/irqnr.h>
  20 #include <linux/errno.h>
  21 #include <linux/topology.h>
  22 #include <linux/wait.h>
  23
  24 #include <asm/irq.h>
  25 #include <asm/ptrace.h>
  26 #include <asm/irq_regs.h>
  27
  28 struct seq_file;
  29 struct module;
  30 struct irq_desc;
  31 struct irq_data;
  32 typedef void (*irq_flow_handler_t)(unsigned int irq,
  33                                             struct irq_desc *desc);
  34 typedef void (*irq_preflow_handler_t)(struct irq_data *data);
  35
  36 /*
  37  * IRQ line status.
  38  *
  39  * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
  40  *
  41  * IRQ_TYPE_NONE                - default, unspecified type
  42  * IRQ_TYPE_EDGE_RISING         - rising edge triggered
  43  * IRQ_TYPE_EDGE_FALLING        - falling edge triggered
  44  * IRQ_TYPE_EDGE_BOTH           - rising and falling edge triggered
  45  * IRQ_TYPE_LEVEL_HIGH          - high level triggered
  46  * IRQ_TYPE_LEVEL_LOW           - low level triggered
  47  * IRQ_TYPE_LEVEL_MASK          - Mask to filter out the level bits
  48  * IRQ_TYPE_SENSE_MASK          - Mask for all the above bits
  49  * IRQ_TYPE_DEFAULT             - For use by some PICs to ask irq_set_type
  50  *                                to setup the HW to a sane default (used
  51  *                                by irqdomain map() callbacks to synchronize
  52  *                                the HW state and SW flags for a newly
  53  *                                allocated descriptor).
  54  *
  55  * IRQ_TYPE_PROBE               - Special flag for probing in progress
  56  *
  57  * Bits which can be modified via irq_set/clear/modify_status_flags()
  58  * IRQ_LEVEL                    - Interrupt is level type. Will be also
  59  *                                updated in the code when the above trigger
  60  *                                bits are modified via irq_set_irq_type()
  61  * IRQ_PER_CPU                  - Mark an interrupt PER_CPU. Will protect
  62  *                                it from affinity setting
  63  * IRQ_NOPROBE                  - Interrupt cannot be probed by autoprobing
  64  * IRQ_NOREQUEST                - Interrupt cannot be requested via
  65  *                                request_irq()
  66  * IRQ_NOTHREAD                 - Interrupt cannot be threaded
  67  * IRQ_NOAUTOEN                 - Interrupt is not automatically enabled in
  68  *                                request/setup_irq()
  69  * IRQ_NO_BALANCING             - Interrupt cannot be balanced (affinity set)
  70  * IRQ_MOVE_PCNTXT              - Interrupt can be migrated from process context
  71  * IRQ_NESTED_TRHEAD            - Interrupt nests into another thread
  72  * IRQ_PER_CPU_DEVID            - Dev_id is a per-cpu variable
  73  */
  74 enum {
  75         IRQ_TYPE_NONE           = 0x00000000,
  76         IRQ_TYPE_EDGE_RISING    = 0x00000001,
  77         IRQ_TYPE_EDGE_FALLING   = 0x00000002,
  78         IRQ_TYPE_EDGE_BOTH      = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
  79         IRQ_TYPE_LEVEL_HIGH     = 0x00000004,
  80         IRQ_TYPE_LEVEL_LOW      = 0x00000008,
  81         IRQ_TYPE_LEVEL_MASK     = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
  82         IRQ_TYPE_SENSE_MASK     = 0x0000000f,
  83         IRQ_TYPE_DEFAULT        = IRQ_TYPE_SENSE_MASK,
  84
  85         IRQ_TYPE_PROBE          = 0x00000010,
  86
  87         IRQ_LEVEL               = (1 <<  8),
  88         IRQ_PER_CPU             = (1 <<  9),
  89         IRQ_NOPROBE             = (1 << 10),
  90         IRQ_NOREQUEST           = (1 << 11),
  91         IRQ_NOAUTOEN            = (1 << 12),
  92         IRQ_NO_BALANCING        = (1 << 13),
  93         IRQ_MOVE_PCNTXT         = (1 << 14),
  94         IRQ_NESTED_THREAD       = (1 << 15),
  95         IRQ_NOTHREAD            = (1 << 16),
  96         IRQ_PER_CPU_DEVID       = (1 << 17),
  97 };
  98
  99 #define IRQF_MODIFY_MASK        \
 100         (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
 101          IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
 102          IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID)
 103
 104 #define IRQ_NO_BALANCING_MASK   (IRQ_PER_CPU | IRQ_NO_BALANCING)
 105
 106 /*
 107  * Return value for chip->irq_set_affinity()
 108  *
 109  * IRQ_SET_MASK_OK      - OK, core updates irq_data.affinity
 110  * IRQ_SET_MASK_NOCPY   - OK, chip did update irq_data.affinity
 111  */
 112 enum {
 113         IRQ_SET_MASK_OK = 0,
 114         IRQ_SET_MASK_OK_NOCOPY,
 115 };
 116
 117 struct msi_desc;
 118 struct irq_domain;
 119
 120 /**
 121  * struct irq_data - per irq and irq chip data passed down to chip functions
 122  * @irq:                interrupt number
 123  * @hwirq:              hardware interrupt number, local to the interrupt domain
 124  * @node:               node index useful for balancing
 125  * @state_use_accessors: status information for irq chip functions.
 126  *                      Use accessor functions to deal with it
 127  * @chip:               low level interrupt hardware access
 128  * @domain:             Interrupt translation domain; responsible for mapping
 129  *                      between hwirq number and linux irq number.
 130  * @handler_data:       per-IRQ data for the irq_chip methods
 131  * @chip_data:          platform-specific per-chip private data for the chip
 132  *                      methods, to allow shared chip implementations
 133  * @msi_desc:           MSI descriptor
 134  * @affinity:           IRQ affinity on SMP
 135  *
 136  * The fields here need to overlay the ones in irq_desc until we
 137  * cleaned up the direct references and switched everything over to
 138  * irq_data.
 139  */
 140 struct irq_data {
 141         unsigned int            irq;
 142         unsigned long           hwirq;
 143         unsigned int            node;
 144         unsigned int            state_use_accessors;
 145         struct irq_chip         *chip;
 146         struct irq_domain       *domain;
 147         void                    *handler_data;
 148         void                    *chip_data;
 149         struct msi_desc         *msi_desc;
 150         cpumask_var_t           affinity;
 151 };
 152
 153 /*
 154  * Bit masks for irq_data.state
 155  *
 156  * IRQD_TRIGGER_MASK            - Mask for the trigger type bits
 157  * IRQD_SETAFFINITY_PENDING     - Affinity setting is pending
 158  * IRQD_NO_BALANCING            - Balancing disabled for this IRQ
 159  * IRQD_PER_CPU                 - Interrupt is per cpu
 160  * IRQD_AFFINITY_SET            - Interrupt affinity was set
 161  * IRQD_LEVEL                   - Interrupt is level triggered
 162  * IRQD_WAKEUP_STATE            - Interrupt is configured for wakeup
 163  *                                from suspend
 164  * IRDQ_MOVE_PCNTXT             - Interrupt can be moved in process
 165  *                                context
 166  * IRQD_IRQ_DISABLED            - Disabled state of the interrupt
 167  * IRQD_IRQ_MASKED              - Masked state of the interrupt
 168  * IRQD_IRQ_INPROGRESS          - In progress state of the interrupt
 169  */
 170 enum {
 171         IRQD_TRIGGER_MASK               = 0xf,
 172         IRQD_SETAFFINITY_PENDING        = (1 <<  8),
 173         IRQD_NO_BALANCING               = (1 << 10),
 174         IRQD_PER_CPU                    = (1 << 11),
 175         IRQD_AFFINITY_SET               = (1 << 12),
 176         IRQD_LEVEL                      = (1 << 13),
 177         IRQD_WAKEUP_STATE               = (1 << 14),
 178         IRQD_MOVE_PCNTXT                = (1 << 15),
 179         IRQD_IRQ_DISABLED               = (1 << 16),
 180         IRQD_IRQ_MASKED                 = (1 << 17),
 181         IRQD_IRQ_INPROGRESS             = (1 << 18),
 182 };
 183
 184 static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
 185 {
 186         return d->state_use_accessors & IRQD_SETAFFINITY_PENDING;
 187 }
 188
 189 static inline bool irqd_is_per_cpu(struct irq_data *d)
 190 {
 191         return d->state_use_accessors & IRQD_PER_CPU;
 192 }
 193
 194 static inline bool irqd_can_balance(struct irq_data *d)
 195 {
 196         return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING));
 197 }
 198
 199 static inline bool irqd_affinity_was_set(struct irq_data *d)
 200 {
 201         return d->state_use_accessors & IRQD_AFFINITY_SET;
 202 }
 203
 204 static inline void irqd_mark_affinity_was_set(struct irq_data *d)
 205 {
 206         d->state_use_accessors |= IRQD_AFFINITY_SET;
 207 }
 208
 209 static inline u32 irqd_get_trigger_type(struct irq_data *d)
 210 {
 211         return d->state_use_accessors & IRQD_TRIGGER_MASK;
 212 }
 213
 214 /*
 215  * Must only be called inside irq_chip.irq_set_type() functions.
 216  */
 217 static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
 218 {
 219         d->state_use_accessors &= ~IRQD_TRIGGER_MASK;
 220         d->state_use_accessors |= type & IRQD_TRIGGER_MASK;
 221 }
 222
 223 static inline bool irqd_is_level_type(struct irq_data *d)
 224 {
 225         return d->state_use_accessors & IRQD_LEVEL;
 226 }
 227
 228 static inline bool irqd_is_wakeup_set(struct irq_data *d)
 229 {
 230         return d->state_use_accessors & IRQD_WAKEUP_STATE;
 231 }
 232
 233 static inline bool irqd_can_move_in_process_context(struct irq_data *d)
 234 {
 235         return d->state_use_accessors & IRQD_MOVE_PCNTXT;
 236 }
 237
 238 static inline bool irqd_irq_disabled(struct irq_data *d)
 239 {
 240         return d->state_use_accessors & IRQD_IRQ_DISABLED;
 241 }
 242
 243 static inline bool irqd_irq_masked(struct irq_data *d)
 244 {
 245         return d->state_use_accessors & IRQD_IRQ_MASKED;
 246 }
 247
 248 static inline bool irqd_irq_inprogress(struct irq_data *d)
 249 {
 250         return d->state_use_accessors & IRQD_IRQ_INPROGRESS;
 251 }
 252
 253 /*
 254  * Functions for chained handlers which can be enabled/disabled by the
 255  * standard disable_irq/enable_irq calls. Must be called with
 256  * irq_desc->lock held.
 257  */
 258 static inline void irqd_set_chained_irq_inprogress(struct irq_data *d)
 259 {
 260         d->state_use_accessors |= IRQD_IRQ_INPROGRESS;
 261 }
 262
 263 static inline void irqd_clr_chained_irq_inprogress(struct irq_data *d)
 264 {
 265         d->state_use_accessors &= ~IRQD_IRQ_INPROGRESS;
 266 }
 267
 268 static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
 269 {
 270         return d->hwirq;
 271 }
 272
 273 /**
 274  * struct irq_chip - hardware interrupt chip descriptor
 275  *
 276  * @name:               name for /proc/interrupts
 277  * @irq_startup:        start up the interrupt (defaults to ->enable if NULL)
 278  * @irq_shutdown:       shut down the interrupt (defaults to ->disable if NULL)
 279  * @irq_enable:         enable the interrupt (defaults to chip->unmask if NULL)
 280  * @irq_disable:        disable the interrupt
 281  * @irq_ack:            start of a new interrupt
 282  * @irq_mask:           mask an interrupt source
 283  * @irq_mask_ack:       ack and mask an interrupt source
 284  * @irq_unmask:         unmask an interrupt source
 285  * @irq_eoi:            end of interrupt
 286  * @irq_set_affinity:   set the CPU affinity on SMP machines
 287  * @irq_retrigger:      resend an IRQ to the CPU
 288  * @irq_set_type:       set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 289  * @irq_set_wake:       enable/disable power-management wake-on of an IRQ
 290  * @irq_bus_lock:       function to lock access to slow bus (i2c) chips
 291  * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
 292  * @irq_cpu_online:     configure an interrupt source for a secondary CPU
 293  * @irq_cpu_offline:    un-configure an interrupt source for a secondary CPU
 294  * @irq_suspend:        function called from core code on suspend once per chip
 295  * @irq_resume:         function called from core code on resume once per chip
 296  * @irq_pm_shutdown:    function called from core code on shutdown once per chip
 297  * @irq_print_chip:     optional to print special chip info in show_interrupts
 298  * @flags:              chip specific flags
 299  */
 300 struct irq_chip {
 301         const char      *name;
 302         unsigned int    (*irq_startup)(struct irq_data *data);
 303         void            (*irq_shutdown)(struct irq_data *data);
 304         void            (*irq_enable)(struct irq_data *data);
 305         void            (*irq_disable)(struct irq_data *data);
 306
 307         void            (*irq_ack)(struct irq_data *data);
 308         void            (*irq_mask)(struct irq_data *data);
 309         void            (*irq_mask_ack)(struct irq_data *data);
 310         void            (*irq_unmask)(struct irq_data *data);
 311         void            (*irq_eoi)(struct irq_data *data);
 312
 313         int             (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
 314         int             (*irq_retrigger)(struct irq_data *data);
 315         int             (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
 316         int             (*irq_set_wake)(struct irq_data *data, unsigned int on);
 317
 318         void            (*irq_bus_lock)(struct irq_data *data);
 319         void            (*irq_bus_sync_unlock)(struct irq_data *data);
 320
 321         void            (*irq_cpu_online)(struct irq_data *data);
 322         void            (*irq_cpu_offline)(struct irq_data *data);
 323
 324         void            (*irq_suspend)(struct irq_data *data);
 325         void            (*irq_resume)(struct irq_data *data);
 326         void            (*irq_pm_shutdown)(struct irq_data *data);
 327
 328         void            (*irq_print_chip)(struct irq_data *data, struct seq_file *p);
 329
 330         unsigned long   flags;
 331 };
 332
 333 /*
 334  * irq_chip specific flags
 335  *
 336  * IRQCHIP_SET_TYPE_MASKED:     Mask before calling chip.irq_set_type()
 337  * IRQCHIP_EOI_IF_HANDLED:      Only issue irq_eoi() when irq was handled
 338  * IRQCHIP_MASK_ON_SUSPEND:     Mask non wake irqs in the suspend path
 339  * IRQCHIP_ONOFFLINE_ENABLED:   Only call irq_on/off_line callbacks
 340  *                              when irq enabled
 341  * IRQCHIP_SKIP_SET_WAKE:       Skip chip.irq_set_wake(), for this irq chip
 342  */
 343 enum {
 344         IRQCHIP_SET_TYPE_MASKED         = (1 <<  0),
 345         IRQCHIP_EOI_IF_HANDLED          = (1 <<  1),
 346         IRQCHIP_MASK_ON_SUSPEND         = (1 <<  2),
 347         IRQCHIP_ONOFFLINE_ENABLED       = (1 <<  3),
 348         IRQCHIP_SKIP_SET_WAKE           = (1 <<  4),
 349         IRQCHIP_ONESHOT_SAFE            = (1 <<  5),
 350 };
 351
 352 /* This include will go away once we isolated irq_desc usage to core code */
 353 #include <linux/irqdesc.h>
 354
 355 /*
 356  * Pick up the arch-dependent methods:
 357  */
 358 #include <asm/hw_irq.h>
 359
 360 #ifndef NR_IRQS_LEGACY
 361 # define NR_IRQS_LEGACY 0
 362 #endif
 363
 364 #ifndef ARCH_IRQ_INIT_FLAGS
 365 # define ARCH_IRQ_INIT_FLAGS    0
 366 #endif
 367
 368 #define IRQ_DEFAULT_INIT_FLAGS  ARCH_IRQ_INIT_FLAGS
 369
 370 struct irqaction;
 371 extern int setup_irq(unsigned int irq, struct irqaction *new);
 372 extern void remove_irq(unsigned int irq, struct irqaction *act);
 373 extern int setup_percpu_irq(unsigned int irq, struct irqaction *new);
 374 extern void remove_percpu_irq(unsigned int irq, struct irqaction *act);
 375
 376 extern void irq_cpu_online(void);
 377 extern void irq_cpu_offline(void);
 378 extern int __irq_set_affinity_locked(struct irq_data *data,  const struct cpumask *cpumask);
 379
 380 #ifdef CONFIG_GENERIC_HARDIRQS
 381
 382 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
 383 void irq_move_irq(struct irq_data *data);
 384 void irq_move_masked_irq(struct irq_data *data);
 385 #else
 386 static inline void irq_move_irq(struct irq_data *data) { }
 387 static inline void irq_move_masked_irq(struct irq_data *data) { }
 388 #endif
 389
 390 extern int no_irq_affinity;
 391
 392 #ifdef CONFIG_HARDIRQS_SW_RESEND
 393 int irq_set_parent(int irq, int parent_irq);
 394 #else
 395 static inline int irq_set_parent(int irq, int parent_irq)
 396 {
 397         return 0;
 398 }
 399 #endif
 400
 401 /*
 402  * Built-in IRQ handlers for various IRQ types,
 403  * callable via desc->handle_irq()
 404  */
 405 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
 406 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 407 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 408 extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);
 409 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 410 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 411 extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc);
 412 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 413 extern void handle_nested_irq(unsigned int irq);
 414
 415 /* Handling of unhandled and spurious interrupts: */
 416 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 417                            irqreturn_t action_ret);
 418
 419
 420 /* Enable/disable irq debugging output: */
 421 extern int noirqdebug_setup(char *str);
 422
 423 /* Checks whether the interrupt can be requested by request_irq(): */
 424 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 425
 426 /* Dummy irq-chip implementations: */
 427 extern struct irq_chip no_irq_chip;
 428 extern struct irq_chip dummy_irq_chip;
 429
 430 extern void
 431 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 432                               irq_flow_handler_t handle, const char *name);
 433
 434 static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 435                                             irq_flow_handler_t handle)
 436 {
 437         irq_set_chip_and_handler_name(irq, chip, handle, NULL);
 438 }
 439
 440 extern int irq_set_percpu_devid(unsigned int irq);
 441
 442 extern void
 443 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 444                   const char *name);
 445
 446 static inline void
 447 irq_set_handler(unsigned int irq, irq_flow_handler_t handle)
 448 {
 449         __irq_set_handler(irq, handle, 0, NULL);
 450 }
 451
 452 /*
 453  * Set a highlevel chained flow handler for a given IRQ.
 454  * (a chained handler is automatically enabled and set to
 455  *  IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD)
 456  */
 457 static inline void
 458 irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
 459 {
 460         __irq_set_handler(irq, handle, 1, NULL);
 461 }
 462
 463 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
 464
 465 static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
 466 {
 467         irq_modify_status(irq, 0, set);
 468 }
 469
 470 static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
 471 {
 472         irq_modify_status(irq, clr, 0);
 473 }
 474
 475 static inline void irq_set_noprobe(unsigned int irq)
 476 {
 477         irq_modify_status(irq, 0, IRQ_NOPROBE);
 478 }
 479
 480 static inline void irq_set_probe(unsigned int irq)
 481 {
 482         irq_modify_status(irq, IRQ_NOPROBE, 0);
 483 }
 484
 485 static inline void irq_set_nothread(unsigned int irq)
 486 {
 487         irq_modify_status(irq, 0, IRQ_NOTHREAD);
 488 }
 489
 490 static inline void irq_set_thread(unsigned int irq)
 491 {
 492         irq_modify_status(irq, IRQ_NOTHREAD, 0);
 493 }
 494
 495 static inline void irq_set_nested_thread(unsigned int irq, bool nest)
 496 {
 497         if (nest)
 498                 irq_set_status_flags(irq, IRQ_NESTED_THREAD);
 499         else
 500                 irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
 501 }
 502
 503 static inline void irq_set_percpu_devid_flags(unsigned int irq)
 504 {
 505         irq_set_status_flags(irq,
 506                              IRQ_NOAUTOEN | IRQ_PER_CPU | IRQ_NOTHREAD |
 507                              IRQ_NOPROBE | IRQ_PER_CPU_DEVID);
 508 }
 509
 510 /* Handle dynamic irq creation and destruction */
 511 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
 512 extern unsigned int __create_irqs(unsigned int from, unsigned int count,
 513                                   int node);
 514 extern int create_irq(void);
 515 extern void destroy_irq(unsigned int irq);
 516 extern void destroy_irqs(unsigned int irq, unsigned int count);
 517
 518 /*
 519  * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
 520  * irq_free_desc instead.
 521  */
 522 extern void dynamic_irq_cleanup(unsigned int irq);
 523 static inline void dynamic_irq_init(unsigned int irq)
 524 {
 525         dynamic_irq_cleanup(irq);
 526 }
 527
 528 /* Set/get chip/data for an IRQ: */
 529 extern int irq_set_chip(unsigned int irq, struct irq_chip *chip);
 530 extern int irq_set_handler_data(unsigned int irq, void *data);
 531 extern int irq_set_chip_data(unsigned int irq, void *data);
 532 extern int irq_set_irq_type(unsigned int irq, unsigned int type);
 533 extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
 534 extern int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
 535                                 struct msi_desc *entry);
 536 extern struct irq_data *irq_get_irq_data(unsigned int irq);
 537
 538 static inline struct irq_chip *irq_get_chip(unsigned int irq)
 539 {
 540         struct irq_data *d = irq_get_irq_data(irq);
 541         return d ? d->chip : NULL;
 542 }
 543
 544 static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
 545 {
 546         return d->chip;
 547 }
 548
 549 static inline void *irq_get_chip_data(unsigned int irq)
 550 {
 551         struct irq_data *d = irq_get_irq_data(irq);
 552         return d ? d->chip_data : NULL;
 553 }
 554
 555 static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
 556 {
 557         return d->chip_data;
 558 }
 559
 560 static inline void *irq_get_handler_data(unsigned int irq)
 561 {
 562         struct irq_data *d = irq_get_irq_data(irq);
 563         return d ? d->handler_data : NULL;
 564 }
 565
 566 static inline void *irq_data_get_irq_handler_data(struct irq_data *d)
 567 {
 568         return d->handler_data;
 569 }
 570
 571 static inline struct msi_desc *irq_get_msi_desc(unsigned int irq)
 572 {
 573         struct irq_data *d = irq_get_irq_data(irq);
 574         return d ? d->msi_desc : NULL;
 575 }
 576
 577 static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
 578 {
 579         return d->msi_desc;
 580 }
 581
 582 int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
 583                 struct module *owner);
 584
 585 /* use macros to avoid needing export.h for THIS_MODULE */
 586 #define irq_alloc_descs(irq, from, cnt, node)   \
 587         __irq_alloc_descs(irq, from, cnt, node, THIS_MODULE)
 588
 589 #define irq_alloc_desc(node)                    \
 590         irq_alloc_descs(-1, 0, 1, node)
 591
 592 #define irq_alloc_desc_at(at, node)             \
 593         irq_alloc_descs(at, at, 1, node)
 594
 595 #define irq_alloc_desc_from(from, node)         \
 596         irq_alloc_descs(-1, from, 1, node)
 597
 598 #define irq_alloc_descs_from(from, cnt, node)   \
 599         irq_alloc_descs(-1, from, cnt, node)
 600
 601 void irq_free_descs(unsigned int irq, unsigned int cnt);
 602 int irq_reserve_irqs(unsigned int from, unsigned int cnt);
 603
 604 static inline void irq_free_desc(unsigned int irq)
 605 {
 606         irq_free_descs(irq, 1);
 607 }
 608
 609 static inline int irq_reserve_irq(unsigned int irq)
 610 {
 611         return irq_reserve_irqs(irq, 1);
 612 }
 613
 614 #ifndef irq_reg_writel
 615 # define irq_reg_writel(val, addr)      writel(val, addr)
 616 #endif
 617 #ifndef irq_reg_readl
 618 # define irq_reg_readl(addr)            readl(addr)
 619 #endif
 620
 621 /**
 622  * struct irq_chip_regs - register offsets for struct irq_gci
 623  * @enable:     Enable register offset to reg_base
 624  * @disable:    Disable register offset to reg_base
 625  * @mask:       Mask register offset to reg_base
 626  * @ack:        Ack register offset to reg_base
 627  * @eoi:        Eoi register offset to reg_base
 628  * @type:       Type configuration register offset to reg_base
 629  * @polarity:   Polarity configuration register offset to reg_base
 630  */
 631 struct irq_chip_regs {
 632         unsigned long           enable;
 633         unsigned long           disable;
 634         unsigned long           mask;
 635         unsigned long           ack;
 636         unsigned long           eoi;
 637         unsigned long           type;
 638         unsigned long           polarity;
 639 };
 640
 641 /**
 642  * struct irq_chip_type - Generic interrupt chip instance for a flow type
 643  * @chip:               The real interrupt chip which provides the callbacks
 644  * @regs:               Register offsets for this chip
 645  * @handler:            Flow handler associated with this chip
 646  * @type:               Chip can handle these flow types
 647  *
 648  * A irq_generic_chip can have several instances of irq_chip_type when
 649  * it requires different functions and register offsets for different
 650  * flow types.
 651  */
 652 struct irq_chip_type {
 653         struct irq_chip         chip;
 654         struct irq_chip_regs    regs;
 655         irq_flow_handler_t      handler;
 656         u32                     type;
 657 };
 658
 659 /**
 660  * struct irq_chip_generic - Generic irq chip data structure
 661  * @lock:               Lock to protect register and cache data access
 662  * @reg_base:           Register base address (virtual)
 663  * @irq_base:           Interrupt base nr for this chip
 664  * @irq_cnt:            Number of interrupts handled by this chip
 665  * @mask_cache:         Cached mask register
 666  * @type_cache:         Cached type register
 667  * @polarity_cache:     Cached polarity register
 668  * @wake_enabled:       Interrupt can wakeup from suspend
 669  * @wake_active:        Interrupt is marked as an wakeup from suspend source
 670  * @num_ct:             Number of available irq_chip_type instances (usually 1)
 671  * @private:            Private data for non generic chip callbacks
 672  * @list:               List head for keeping track of instances
 673  * @chip_types:         Array of interrupt irq_chip_types
 674  *
 675  * Note, that irq_chip_generic can have multiple irq_chip_type
 676  * implementations which can be associated to a particular irq line of
 677  * an irq_chip_generic instance. That allows to share and protect
 678  * state in an irq_chip_generic instance when we need to implement
 679  * different flow mechanisms (level/edge) for it.
 680  */
 681 struct irq_chip_generic {
 682         raw_spinlock_t          lock;
 683         void __iomem            *reg_base;
 684         unsigned int            irq_base;
 685         unsigned int            irq_cnt;
 686         u32                     mask_cache;
 687         u32                     type_cache;
 688         u32                     polarity_cache;
 689         u32                     wake_enabled;
 690         u32                     wake_active;
 691         unsigned int            num_ct;
 692         void                    *private;
 693         struct list_head        list;
 694         struct irq_chip_type    chip_types[0];
 695 };
 696
 697 /**
 698  * enum irq_gc_flags - Initialization flags for generic irq chips
 699  * @IRQ_GC_INIT_MASK_CACHE:     Initialize the mask_cache by reading mask reg
 700  * @IRQ_GC_INIT_NESTED_LOCK:    Set the lock class of the irqs to nested for
 701  *                              irq chips which need to call irq_set_wake() on
 702  *                              the parent irq. Usually GPIO implementations
 703  */
 704 enum irq_gc_flags {
 705         IRQ_GC_INIT_MASK_CACHE          = 1 << 0,
 706         IRQ_GC_INIT_NESTED_LOCK         = 1 << 1,
 707 };
 708
 709 /* Generic chip callback functions */
 710 void irq_gc_noop(struct irq_data *d);
 711 void irq_gc_mask_disable_reg(struct irq_data *d);
 712 void irq_gc_mask_set_bit(struct irq_data *d);
 713 void irq_gc_mask_clr_bit(struct irq_data *d);
 714 void irq_gc_unmask_enable_reg(struct irq_data *d);
 715 void irq_gc_ack_set_bit(struct irq_data *d);
 716 void irq_gc_ack_clr_bit(struct irq_data *d);
 717 void irq_gc_mask_disable_reg_and_ack(struct irq_data *d);
 718 void irq_gc_eoi(struct irq_data *d);
 719 int irq_gc_set_wake(struct irq_data *d, unsigned int on);
 720
 721 /* Setup functions for irq_chip_generic */
 722 struct irq_chip_generic *
 723 irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base,
 724                        void __iomem *reg_base, irq_flow_handler_t handler);
 725 void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
 726                             enum irq_gc_flags flags, unsigned int clr,
 727                             unsigned int set);
 728 int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
 729 void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
 730                              unsigned int clr, unsigned int set);
 731
 732 static inline struct irq_chip_type *irq_data_get_chip_type(struct irq_data *d)
 733 {
 734         return container_of(d->chip, struct irq_chip_type, chip);
 735 }
 736
 737 #define IRQ_MSK(n) (u32)((n) < 32 ? ((1 << (n)) - 1) : UINT_MAX)
 738
 739 #ifdef CONFIG_SMP
 740 static inline void irq_gc_lock(struct irq_chip_generic *gc)
 741 {
 742         raw_spin_lock(&gc->lock);
 743 }
 744
 745 static inline void irq_gc_unlock(struct irq_chip_generic *gc)
 746 {
 747         raw_spin_unlock(&gc->lock);
 748 }
 749 #else
 750 static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
 751 static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
 752 #endif
 753
 754 #else /* !CONFIG_GENERIC_HARDIRQS */
 755
 756 extern struct msi_desc *irq_get_msi_desc(unsigned int irq);
 757 extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
 758
 759 #endif /* CONFIG_GENERIC_HARDIRQS */
 760
 761 #endif /* _LINUX_IRQ_H */