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