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  * IRQ_IS_POLLED                - Always polled by another interrupt. Exclude
  74  *                                it from the spurious interrupt detection
  75  *                                mechanism and from core side polling.
  76  */
  77 enum {
  78         IRQ_TYPE_NONE           = 0x00000000,
  79         IRQ_TYPE_EDGE_RISING    = 0x00000001,
  80         IRQ_TYPE_EDGE_FALLING   = 0x00000002,
  81         IRQ_TYPE_EDGE_BOTH      = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
  82         IRQ_TYPE_LEVEL_HIGH     = 0x00000004,
  83         IRQ_TYPE_LEVEL_LOW      = 0x00000008,
  84         IRQ_TYPE_LEVEL_MASK     = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
  85         IRQ_TYPE_SENSE_MASK     = 0x0000000f,
  86         IRQ_TYPE_DEFAULT        = IRQ_TYPE_SENSE_MASK,
  87
  88         IRQ_TYPE_PROBE          = 0x00000010,
  89
  90         IRQ_LEVEL               = (1 <<  8),
  91         IRQ_PER_CPU             = (1 <<  9),
  92         IRQ_NOPROBE             = (1 << 10),
  93         IRQ_NOREQUEST           = (1 << 11),
  94         IRQ_NOAUTOEN            = (1 << 12),
  95         IRQ_NO_BALANCING        = (1 << 13),
  96         IRQ_MOVE_PCNTXT         = (1 << 14),
  97         IRQ_NESTED_THREAD       = (1 << 15),
  98         IRQ_NOTHREAD            = (1 << 16),
  99         IRQ_PER_CPU_DEVID       = (1 << 17),
 100         IRQ_IS_POLLED           = (1 << 18),
 101 };
 102
 103 #define IRQF_MODIFY_MASK        \
 104         (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
 105          IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
 106          IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
 107          IRQ_IS_POLLED)
 108
 109 #define IRQ_NO_BALANCING_MASK   (IRQ_PER_CPU | IRQ_NO_BALANCING)
 110
 111 /*
 112  * Return value for chip->irq_set_affinity()
 113  *
 114  * IRQ_SET_MASK_OK      - OK, core updates irq_data.affinity
 115  * IRQ_SET_MASK_NOCPY   - OK, chip did update irq_data.affinity
 116  */
 117 enum {
 118         IRQ_SET_MASK_OK = 0,
 119         IRQ_SET_MASK_OK_NOCOPY,
 120 };
 121
 122 struct msi_desc;
 123 struct irq_domain;
 124
 125 /**
 126  * struct irq_data - per irq and irq chip data passed down to chip functions
 127  * @mask:               precomputed bitmask for accessing the chip registers
 128  * @irq:                interrupt number
 129  * @hwirq:              hardware interrupt number, local to the interrupt domain
 130  * @node:               node index useful for balancing
 131  * @state_use_accessors: status information for irq chip functions.
 132  *                      Use accessor functions to deal with it
 133  * @chip:               low level interrupt hardware access
 134  * @domain:             Interrupt translation domain; responsible for mapping
 135  *                      between hwirq number and linux irq number.
 136  * @handler_data:       per-IRQ data for the irq_chip methods
 137  * @chip_data:          platform-specific per-chip private data for the chip
 138  *                      methods, to allow shared chip implementations
 139  * @msi_desc:           MSI descriptor
 140  * @affinity:           IRQ affinity on SMP
 141  *
 142  * The fields here need to overlay the ones in irq_desc until we
 143  * cleaned up the direct references and switched everything over to
 144  * irq_data.
 145  */
 146 struct irq_data {
 147         u32                     mask;
 148         unsigned int            irq;
 149         unsigned long           hwirq;
 150         unsigned int            node;
 151         unsigned int            state_use_accessors;
 152         struct irq_chip         *chip;
 153         struct irq_domain       *domain;
 154         void                    *handler_data;
 155         void                    *chip_data;
 156         struct msi_desc         *msi_desc;
 157         cpumask_var_t           affinity;
 158 };
 159
 160 /*
 161  * Bit masks for irq_data.state
 162  *
 163  * IRQD_TRIGGER_MASK            - Mask for the trigger type bits
 164  * IRQD_SETAFFINITY_PENDING     - Affinity setting is pending
 165  * IRQD_NO_BALANCING            - Balancing disabled for this IRQ
 166  * IRQD_PER_CPU                 - Interrupt is per cpu
 167  * IRQD_AFFINITY_SET            - Interrupt affinity was set
 168  * IRQD_LEVEL                   - Interrupt is level triggered
 169  * IRQD_WAKEUP_STATE            - Interrupt is configured for wakeup
 170  *                                from suspend
 171  * IRDQ_MOVE_PCNTXT             - Interrupt can be moved in process
 172  *                                context
 173  * IRQD_IRQ_DISABLED            - Disabled state of the interrupt
 174  * IRQD_IRQ_MASKED              - Masked state of the interrupt
 175  * IRQD_IRQ_INPROGRESS          - In progress state of the interrupt
 176  */
 177 enum {
 178         IRQD_TRIGGER_MASK               = 0xf,
 179         IRQD_SETAFFINITY_PENDING        = (1 <<  8),
 180         IRQD_NO_BALANCING               = (1 << 10),
 181         IRQD_PER_CPU                    = (1 << 11),
 182         IRQD_AFFINITY_SET               = (1 << 12),
 183         IRQD_LEVEL                      = (1 << 13),
 184         IRQD_WAKEUP_STATE               = (1 << 14),
 185         IRQD_MOVE_PCNTXT                = (1 << 15),
 186         IRQD_IRQ_DISABLED               = (1 << 16),
 187         IRQD_IRQ_MASKED                 = (1 << 17),
 188         IRQD_IRQ_INPROGRESS             = (1 << 18),
 189 };
 190
 191 static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
 192 {
 193         return d->state_use_accessors & IRQD_SETAFFINITY_PENDING;
 194 }
 195
 196 static inline bool irqd_is_per_cpu(struct irq_data *d)
 197 {
 198         return d->state_use_accessors & IRQD_PER_CPU;
 199 }
 200
 201 static inline bool irqd_can_balance(struct irq_data *d)
 202 {
 203         return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING));
 204 }
 205
 206 static inline bool irqd_affinity_was_set(struct irq_data *d)
 207 {
 208         return d->state_use_accessors & IRQD_AFFINITY_SET;
 209 }
 210
 211 static inline void irqd_mark_affinity_was_set(struct irq_data *d)
 212 {
 213         d->state_use_accessors |= IRQD_AFFINITY_SET;
 214 }
 215
 216 static inline u32 irqd_get_trigger_type(struct irq_data *d)
 217 {
 218         return d->state_use_accessors & IRQD_TRIGGER_MASK;
 219 }
 220
 221 /*
 222  * Must only be called inside irq_chip.irq_set_type() functions.
 223  */
 224 static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
 225 {
 226         d->state_use_accessors &= ~IRQD_TRIGGER_MASK;
 227         d->state_use_accessors |= type & IRQD_TRIGGER_MASK;
 228 }
 229
 230 static inline bool irqd_is_level_type(struct irq_data *d)
 231 {
 232         return d->state_use_accessors & IRQD_LEVEL;
 233 }
 234
 235 static inline bool irqd_is_wakeup_set(struct irq_data *d)
 236 {
 237         return d->state_use_accessors & IRQD_WAKEUP_STATE;
 238 }
 239
 240 static inline bool irqd_can_move_in_process_context(struct irq_data *d)
 241 {
 242         return d->state_use_accessors & IRQD_MOVE_PCNTXT;
 243 }
 244
 245 static inline bool irqd_irq_disabled(struct irq_data *d)
 246 {
 247         return d->state_use_accessors & IRQD_IRQ_DISABLED;
 248 }
 249
 250 static inline bool irqd_irq_masked(struct irq_data *d)
 251 {
 252         return d->state_use_accessors & IRQD_IRQ_MASKED;
 253 }
 254
 255 static inline bool irqd_irq_inprogress(struct irq_data *d)
 256 {
 257         return d->state_use_accessors & IRQD_IRQ_INPROGRESS;
 258 }
 259
 260 /*
 261  * Functions for chained handlers which can be enabled/disabled by the
 262  * standard disable_irq/enable_irq calls. Must be called with
 263  * irq_desc->lock held.
 264  */
 265 static inline void irqd_set_chained_irq_inprogress(struct irq_data *d)
 266 {
 267         d->state_use_accessors |= IRQD_IRQ_INPROGRESS;
 268 }
 269
 270 static inline void irqd_clr_chained_irq_inprogress(struct irq_data *d)
 271 {
 272         d->state_use_accessors &= ~IRQD_IRQ_INPROGRESS;
 273 }
 274
 275 static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
 276 {
 277         return d->hwirq;
 278 }
 279
 280 /**
 281  * struct irq_chip - hardware interrupt chip descriptor
 282  *
 283  * @name:               name for /proc/interrupts
 284  * @irq_startup:        start up the interrupt (defaults to ->enable if NULL)
 285  * @irq_shutdown:       shut down the interrupt (defaults to ->disable if NULL)
 286  * @irq_enable:         enable the interrupt (defaults to chip->unmask if NULL)
 287  * @irq_disable:        disable the interrupt
 288  * @irq_ack:            start of a new interrupt
 289  * @irq_mask:           mask an interrupt source
 290  * @irq_mask_ack:       ack and mask an interrupt source
 291  * @irq_unmask:         unmask an interrupt source
 292  * @irq_eoi:            end of interrupt
 293  * @irq_set_affinity:   set the CPU affinity on SMP machines
 294  * @irq_retrigger:      resend an IRQ to the CPU
 295  * @irq_set_type:       set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 296  * @irq_set_wake:       enable/disable power-management wake-on of an IRQ
 297  * @irq_bus_lock:       function to lock access to slow bus (i2c) chips
 298  * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
 299  * @irq_cpu_online:     configure an interrupt source for a secondary CPU
 300  * @irq_cpu_offline:    un-configure an interrupt source for a secondary CPU
 301  * @irq_suspend:        function called from core code on suspend once per chip
 302  * @irq_resume:         function called from core code on resume once per chip
 303  * @irq_pm_shutdown:    function called from core code on shutdown once per chip
 304  * @irq_calc_mask:      Optional function to set irq_data.mask for special cases
 305  * @irq_print_chip:     optional to print special chip info in show_interrupts
 306  * @irq_request_resources:      optional to request resources before calling
 307  *                              any other callback related to this irq
 308  * @irq_release_resources:      optional to release resources acquired with
 309  *                              irq_request_resources
 310  * @flags:              chip specific flags
 311  */
 312 struct irq_chip {
 313         const char      *name;
 314         unsigned int    (*irq_startup)(struct irq_data *data);
 315         void            (*irq_shutdown)(struct irq_data *data);
 316         void            (*irq_enable)(struct irq_data *data);
 317         void            (*irq_disable)(struct irq_data *data);
 318
 319         void            (*irq_ack)(struct irq_data *data);
 320         void            (*irq_mask)(struct irq_data *data);
 321         void            (*irq_mask_ack)(struct irq_data *data);
 322         void            (*irq_unmask)(struct irq_data *data);
 323         void            (*irq_eoi)(struct irq_data *data);
 324
 325         int             (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
 326         int             (*irq_retrigger)(struct irq_data *data);
 327         int             (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
 328         int             (*irq_set_wake)(struct irq_data *data, unsigned int on);
 329
 330         void            (*irq_bus_lock)(struct irq_data *data);
 331         void            (*irq_bus_sync_unlock)(struct irq_data *data);
 332
 333         void            (*irq_cpu_online)(struct irq_data *data);
 334         void            (*irq_cpu_offline)(struct irq_data *data);
 335
 336         void            (*irq_suspend)(struct irq_data *data);
 337         void            (*irq_resume)(struct irq_data *data);
 338         void            (*irq_pm_shutdown)(struct irq_data *data);
 339
 340         void            (*irq_calc_mask)(struct irq_data *data);
 341
 342         void            (*irq_print_chip)(struct irq_data *data, struct seq_file *p);
 343         int             (*irq_request_resources)(struct irq_data *data);
 344         void            (*irq_release_resources)(struct irq_data *data);
 345
 346         unsigned long   flags;
 347 };
 348
 349 /*
 350  * irq_chip specific flags
 351  *
 352  * IRQCHIP_SET_TYPE_MASKED:     Mask before calling chip.irq_set_type()
 353  * IRQCHIP_EOI_IF_HANDLED:      Only issue irq_eoi() when irq was handled
 354  * IRQCHIP_MASK_ON_SUSPEND:     Mask non wake irqs in the suspend path
 355  * IRQCHIP_ONOFFLINE_ENABLED:   Only call irq_on/off_line callbacks
 356  *                              when irq enabled
 357  * IRQCHIP_SKIP_SET_WAKE:       Skip chip.irq_set_wake(), for this irq chip
 358  * IRQCHIP_ONESHOT_SAFE:        One shot does not require mask/unmask
 359  * IRQCHIP_EOI_THREADED:        Chip requires eoi() on unmask in threaded mode
 360  */
 361 enum {
 362         IRQCHIP_SET_TYPE_MASKED         = (1 <<  0),
 363         IRQCHIP_EOI_IF_HANDLED          = (1 <<  1),
 364         IRQCHIP_MASK_ON_SUSPEND         = (1 <<  2),
 365         IRQCHIP_ONOFFLINE_ENABLED       = (1 <<  3),
 366         IRQCHIP_SKIP_SET_WAKE           = (1 <<  4),
 367         IRQCHIP_ONESHOT_SAFE            = (1 <<  5),
 368         IRQCHIP_EOI_THREADED            = (1 <<  6),
 369 };
 370
 371 /* This include will go away once we isolated irq_desc usage to core code */
 372 #include <linux/irqdesc.h>
 373
 374 /*
 375  * Pick up the arch-dependent methods:
 376  */
 377 #include <asm/hw_irq.h>
 378
 379 #ifndef NR_IRQS_LEGACY
 380 # define NR_IRQS_LEGACY 0
 381 #endif
 382
 383 #ifndef ARCH_IRQ_INIT_FLAGS
 384 # define ARCH_IRQ_INIT_FLAGS    0
 385 #endif
 386
 387 #define IRQ_DEFAULT_INIT_FLAGS  ARCH_IRQ_INIT_FLAGS
 388
 389 struct irqaction;
 390 extern int setup_irq(unsigned int irq, struct irqaction *new);
 391 extern void remove_irq(unsigned int irq, struct irqaction *act);
 392 extern int setup_percpu_irq(unsigned int irq, struct irqaction *new);
 393 extern void remove_percpu_irq(unsigned int irq, struct irqaction *act);
 394
 395 extern void irq_cpu_online(void);
 396 extern void irq_cpu_offline(void);
 397 extern int irq_set_affinity_locked(struct irq_data *data,
 398                                    const struct cpumask *cpumask, bool force);
 399
 400 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
 401 void irq_move_irq(struct irq_data *data);
 402 void irq_move_masked_irq(struct irq_data *data);
 403 #else
 404 static inline void irq_move_irq(struct irq_data *data) { }
 405 static inline void irq_move_masked_irq(struct irq_data *data) { }
 406 #endif
 407
 408 extern int no_irq_affinity;
 409
 410 #ifdef CONFIG_HARDIRQS_SW_RESEND
 411 int irq_set_parent(int irq, int parent_irq);
 412 #else
 413 static inline int irq_set_parent(int irq, int parent_irq)
 414 {
 415         return 0;
 416 }
 417 #endif
 418
 419 /*
 420  * Built-in IRQ handlers for various IRQ types,
 421  * callable via desc->handle_irq()
 422  */
 423 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
 424 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 425 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 426 extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);
 427 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 428 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 429 extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc);
 430 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 431 extern void handle_nested_irq(unsigned int irq);
 432
 433 /* Handling of unhandled and spurious interrupts: */
 434 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 435                            irqreturn_t action_ret);
 436
 437
 438 /* Enable/disable irq debugging output: */
 439 extern int noirqdebug_setup(char *str);
 440
 441 /* Checks whether the interrupt can be requested by request_irq(): */
 442 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 443
 444 /* Dummy irq-chip implementations: */
 445 extern struct irq_chip no_irq_chip;
 446 extern struct irq_chip dummy_irq_chip;
 447
 448 extern void
 449 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 450                               irq_flow_handler_t handle, const char *name);
 451
 452 static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 453                                             irq_flow_handler_t handle)
 454 {
 455         irq_set_chip_and_handler_name(irq, chip, handle, NULL);
 456 }
 457
 458 extern int irq_set_percpu_devid(unsigned int irq);
 459
 460 extern void
 461 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 462                   const char *name);
 463
 464 static inline void
 465 irq_set_handler(unsigned int irq, irq_flow_handler_t handle)
 466 {
 467         __irq_set_handler(irq, handle, 0, NULL);
 468 }
 469
 470 /*
 471  * Set a highlevel chained flow handler for a given IRQ.
 472  * (a chained handler is automatically enabled and set to
 473  *  IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD)
 474  */
 475 static inline void
 476 irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
 477 {
 478         __irq_set_handler(irq, handle, 1, NULL);
 479 }
 480
 481 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
 482
 483 static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
 484 {
 485         irq_modify_status(irq, 0, set);
 486 }
 487
 488 static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
 489 {
 490         irq_modify_status(irq, clr, 0);
 491 }
 492
 493 static inline void irq_set_noprobe(unsigned int irq)
 494 {
 495         irq_modify_status(irq, 0, IRQ_NOPROBE);
 496 }
 497
 498 static inline void irq_set_probe(unsigned int irq)
 499 {
 500         irq_modify_status(irq, IRQ_NOPROBE, 0);
 501 }
 502
 503 static inline void irq_set_nothread(unsigned int irq)
 504 {
 505         irq_modify_status(irq, 0, IRQ_NOTHREAD);
 506 }
 507
 508 static inline void irq_set_thread(unsigned int irq)
 509 {
 510         irq_modify_status(irq, IRQ_NOTHREAD, 0);
 511 }
 512
 513 static inline void irq_set_nested_thread(unsigned int irq, bool nest)
 514 {
 515         if (nest)
 516                 irq_set_status_flags(irq, IRQ_NESTED_THREAD);
 517         else
 518                 irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
 519 }
 520
 521 static inline void irq_set_percpu_devid_flags(unsigned int irq)
 522 {
 523         irq_set_status_flags(irq,
 524                              IRQ_NOAUTOEN | IRQ_PER_CPU | IRQ_NOTHREAD |
 525                              IRQ_NOPROBE | IRQ_PER_CPU_DEVID);
 526 }
 527
 528 /* Handle dynamic irq creation and destruction */
 529 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
 530 extern unsigned int __create_irqs(unsigned int from, unsigned int count,
 531                                   int node);
 532 extern int create_irq(void);
 533 extern void destroy_irq(unsigned int irq);
 534 extern void destroy_irqs(unsigned int irq, unsigned int count);
 535
 536 /*
 537  * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
 538  * irq_free_desc instead.
 539  */
 540 extern void dynamic_irq_cleanup(unsigned int irq);
 541 static inline void dynamic_irq_init(unsigned int irq)
 542 {
 543         dynamic_irq_cleanup(irq);
 544 }
 545
 546 /* Set/get chip/data for an IRQ: */
 547 extern int irq_set_chip(unsigned int irq, struct irq_chip *chip);
 548 extern int irq_set_handler_data(unsigned int irq, void *data);
 549 extern int irq_set_chip_data(unsigned int irq, void *data);
 550 extern int irq_set_irq_type(unsigned int irq, unsigned int type);
 551 extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
 552 extern int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
 553                                 struct msi_desc *entry);
 554 extern struct irq_data *irq_get_irq_data(unsigned int irq);
 555
 556 static inline struct irq_chip *irq_get_chip(unsigned int irq)
 557 {
 558         struct irq_data *d = irq_get_irq_data(irq);
 559         return d ? d->chip : NULL;
 560 }
 561
 562 static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
 563 {
 564         return d->chip;
 565 }
 566
 567 static inline void *irq_get_chip_data(unsigned int irq)
 568 {
 569         struct irq_data *d = irq_get_irq_data(irq);
 570         return d ? d->chip_data : NULL;
 571 }
 572
 573 static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
 574 {
 575         return d->chip_data;
 576 }
 577
 578 static inline void *irq_get_handler_data(unsigned int irq)
 579 {
 580         struct irq_data *d = irq_get_irq_data(irq);
 581         return d ? d->handler_data : NULL;
 582 }
 583
 584 static inline void *irq_data_get_irq_handler_data(struct irq_data *d)
 585 {
 586         return d->handler_data;
 587 }
 588
 589 static inline struct msi_desc *irq_get_msi_desc(unsigned int irq)
 590 {
 591         struct irq_data *d = irq_get_irq_data(irq);
 592         return d ? d->msi_desc : NULL;
 593 }
 594
 595 static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
 596 {
 597         return d->msi_desc;
 598 }
 599
 600 static inline u32 irq_get_trigger_type(unsigned int irq)
 601 {
 602         struct irq_data *d = irq_get_irq_data(irq);
 603         return d ? irqd_get_trigger_type(d) : 0;
 604 }
 605
 606 int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
 607                 struct module *owner);
 608
 609 /* use macros to avoid needing export.h for THIS_MODULE */
 610 #define irq_alloc_descs(irq, from, cnt, node)   \
 611         __irq_alloc_descs(irq, from, cnt, node, THIS_MODULE)
 612
 613 #define irq_alloc_desc(node)                    \
 614         irq_alloc_descs(-1, 0, 1, node)
 615
 616 #define irq_alloc_desc_at(at, node)             \
 617         irq_alloc_descs(at, at, 1, node)
 618
 619 #define irq_alloc_desc_from(from, node)         \
 620         irq_alloc_descs(-1, from, 1, node)
 621
 622 #define irq_alloc_descs_from(from, cnt, node)   \
 623         irq_alloc_descs(-1, from, cnt, node)
 624
 625 void irq_free_descs(unsigned int irq, unsigned int cnt);
 626 int irq_reserve_irqs(unsigned int from, unsigned int cnt);
 627
 628 static inline void irq_free_desc(unsigned int irq)
 629 {
 630         irq_free_descs(irq, 1);
 631 }
 632
 633 static inline int irq_reserve_irq(unsigned int irq)
 634 {
 635         return irq_reserve_irqs(irq, 1);
 636 }
 637
 638 #ifndef irq_reg_writel
 639 # define irq_reg_writel(val, addr)      writel(val, addr)
 640 #endif
 641 #ifndef irq_reg_readl
 642 # define irq_reg_readl(addr)            readl(addr)
 643 #endif
 644
 645 /**
 646  * struct irq_chip_regs - register offsets for struct irq_gci
 647  * @enable:     Enable register offset to reg_base
 648  * @disable:    Disable register offset to reg_base
 649  * @mask:       Mask register offset to reg_base
 650  * @ack:        Ack register offset to reg_base
 651  * @eoi:        Eoi register offset to reg_base
 652  * @type:       Type configuration register offset to reg_base
 653  * @polarity:   Polarity configuration register offset to reg_base
 654  */
 655 struct irq_chip_regs {
 656         unsigned long           enable;
 657         unsigned long           disable;
 658         unsigned long           mask;
 659         unsigned long           ack;
 660         unsigned long           eoi;
 661         unsigned long           type;
 662         unsigned long           polarity;
 663 };
 664
 665 /**
 666  * struct irq_chip_type - Generic interrupt chip instance for a flow type
 667  * @chip:               The real interrupt chip which provides the callbacks
 668  * @regs:               Register offsets for this chip
 669  * @handler:            Flow handler associated with this chip
 670  * @type:               Chip can handle these flow types
 671  * @mask_cache_priv:    Cached mask register private to the chip type
 672  * @mask_cache:         Pointer to cached mask register
 673  *
 674  * A irq_generic_chip can have several instances of irq_chip_type when
 675  * it requires different functions and register offsets for different
 676  * flow types.
 677  */
 678 struct irq_chip_type {
 679         struct irq_chip         chip;
 680         struct irq_chip_regs    regs;
 681         irq_flow_handler_t      handler;
 682         u32                     type;
 683         u32                     mask_cache_priv;
 684         u32                     *mask_cache;
 685 };
 686
 687 /**
 688  * struct irq_chip_generic - Generic irq chip data structure
 689  * @lock:               Lock to protect register and cache data access
 690  * @reg_base:           Register base address (virtual)
 691  * @irq_base:           Interrupt base nr for this chip
 692  * @irq_cnt:            Number of interrupts handled by this chip
 693  * @mask_cache:         Cached mask register shared between all chip types
 694  * @type_cache:         Cached type register
 695  * @polarity_cache:     Cached polarity register
 696  * @wake_enabled:       Interrupt can wakeup from suspend
 697  * @wake_active:        Interrupt is marked as an wakeup from suspend source
 698  * @num_ct:             Number of available irq_chip_type instances (usually 1)
 699  * @private:            Private data for non generic chip callbacks
 700  * @installed:          bitfield to denote installed interrupts
 701  * @unused:             bitfield to denote unused interrupts
 702  * @domain:             irq domain pointer
 703  * @list:               List head for keeping track of instances
 704  * @chip_types:         Array of interrupt irq_chip_types
 705  *
 706  * Note, that irq_chip_generic can have multiple irq_chip_type
 707  * implementations which can be associated to a particular irq line of
 708  * an irq_chip_generic instance. That allows to share and protect
 709  * state in an irq_chip_generic instance when we need to implement
 710  * different flow mechanisms (level/edge) for it.
 711  */
 712 struct irq_chip_generic {
 713         raw_spinlock_t          lock;
 714         void __iomem            *reg_base;
 715         unsigned int            irq_base;
 716         unsigned int            irq_cnt;
 717         u32                     mask_cache;
 718         u32                     type_cache;
 719         u32                     polarity_cache;
 720         u32                     wake_enabled;
 721         u32                     wake_active;
 722         unsigned int            num_ct;
 723         void                    *private;
 724         unsigned long           installed;
 725         unsigned long           unused;
 726         struct irq_domain       *domain;
 727         struct list_head        list;
 728         struct irq_chip_type    chip_types[0];
 729 };
 730
 731 /**
 732  * enum irq_gc_flags - Initialization flags for generic irq chips
 733  * @IRQ_GC_INIT_MASK_CACHE:     Initialize the mask_cache by reading mask reg
 734  * @IRQ_GC_INIT_NESTED_LOCK:    Set the lock class of the irqs to nested for
 735  *                              irq chips which need to call irq_set_wake() on
 736  *                              the parent irq. Usually GPIO implementations
 737  * @IRQ_GC_MASK_CACHE_PER_TYPE: Mask cache is chip type private
 738  * @IRQ_GC_NO_MASK:             Do not calculate irq_data->mask
 739  */
 740 enum irq_gc_flags {
 741         IRQ_GC_INIT_MASK_CACHE          = 1 << 0,
 742         IRQ_GC_INIT_NESTED_LOCK         = 1 << 1,
 743         IRQ_GC_MASK_CACHE_PER_TYPE      = 1 << 2,
 744         IRQ_GC_NO_MASK                  = 1 << 3,
 745 };
 746
 747 /*
 748  * struct irq_domain_chip_generic - Generic irq chip data structure for irq domains
 749  * @irqs_per_chip:      Number of interrupts per chip
 750  * @num_chips:          Number of chips
 751  * @irq_flags_to_set:   IRQ* flags to set on irq setup
 752  * @irq_flags_to_clear: IRQ* flags to clear on irq setup
 753  * @gc_flags:           Generic chip specific setup flags
 754  * @gc:                 Array of pointers to generic interrupt chips
 755  */
 756 struct irq_domain_chip_generic {
 757         unsigned int            irqs_per_chip;
 758         unsigned int            num_chips;
 759         unsigned int            irq_flags_to_clear;
 760         unsigned int            irq_flags_to_set;
 761         enum irq_gc_flags       gc_flags;
 762         struct irq_chip_generic *gc[0];
 763 };
 764
 765 /* Generic chip callback functions */
 766 void irq_gc_noop(struct irq_data *d);
 767 void irq_gc_mask_disable_reg(struct irq_data *d);
 768 void irq_gc_mask_set_bit(struct irq_data *d);
 769 void irq_gc_mask_clr_bit(struct irq_data *d);
 770 void irq_gc_unmask_enable_reg(struct irq_data *d);
 771 void irq_gc_ack_set_bit(struct irq_data *d);
 772 void irq_gc_ack_clr_bit(struct irq_data *d);
 773 void irq_gc_mask_disable_reg_and_ack(struct irq_data *d);
 774 void irq_gc_eoi(struct irq_data *d);
 775 int irq_gc_set_wake(struct irq_data *d, unsigned int on);
 776
 777 /* Setup functions for irq_chip_generic */
 778 struct irq_chip_generic *
 779 irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base,
 780                        void __iomem *reg_base, irq_flow_handler_t handler);
 781 void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
 782                             enum irq_gc_flags flags, unsigned int clr,
 783                             unsigned int set);
 784 int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
 785 void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
 786                              unsigned int clr, unsigned int set);
 787
 788 struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq);
 789 int irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
 790                                    int num_ct, const char *name,
 791                                    irq_flow_handler_t handler,
 792                                    unsigned int clr, unsigned int set,
 793                                    enum irq_gc_flags flags);
 794
 795
 796 static inline struct irq_chip_type *irq_data_get_chip_type(struct irq_data *d)
 797 {
 798         return container_of(d->chip, struct irq_chip_type, chip);
 799 }
 800
 801 #define IRQ_MSK(n) (u32)((n) < 32 ? ((1 << (n)) - 1) : UINT_MAX)
 802
 803 #ifdef CONFIG_SMP
 804 static inline void irq_gc_lock(struct irq_chip_generic *gc)
 805 {
 806         raw_spin_lock(&gc->lock);
 807 }
 808
 809 static inline void irq_gc_unlock(struct irq_chip_generic *gc)
 810 {
 811         raw_spin_unlock(&gc->lock);
 812 }
 813 #else
 814 static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
 815 static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
 816 #endif
 817
 818 #endif /* _LINUX_IRQ_H */