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/irqhandler.h> 19 #include <linux/irqreturn.h> 20 #include <linux/irqnr.h> 21 #include <linux/errno.h> 22 #include <linux/topology.h> 23 #include <linux/wait.h> 24 #include <linux/io.h> 25 26 #include <asm/irq.h> 27 #include <asm/ptrace.h> 28 #include <asm/irq_regs.h> 29 30 struct seq_file; 31 struct module; 32 struct msi_msg; 33 enum irqchip_irq_state; 34 35 /* 36 * IRQ line status. 37 * 38 * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h 39 * 40 * IRQ_TYPE_NONE - default, unspecified type 41 * IRQ_TYPE_EDGE_RISING - rising edge triggered 42 * IRQ_TYPE_EDGE_FALLING - falling edge triggered 43 * IRQ_TYPE_EDGE_BOTH - rising and falling edge triggered 44 * IRQ_TYPE_LEVEL_HIGH - high level triggered 45 * IRQ_TYPE_LEVEL_LOW - low level triggered 46 * IRQ_TYPE_LEVEL_MASK - Mask to filter out the level bits 47 * IRQ_TYPE_SENSE_MASK - Mask for all the above bits 48 * IRQ_TYPE_DEFAULT - For use by some PICs to ask irq_set_type 49 * to setup the HW to a sane default (used 50 * by irqdomain map() callbacks to synchronize 51 * the HW state and SW flags for a newly 52 * allocated descriptor). 53 * 54 * IRQ_TYPE_PROBE - Special flag for probing in progress 55 * 56 * Bits which can be modified via irq_set/clear/modify_status_flags() 57 * IRQ_LEVEL - Interrupt is level type. Will be also 58 * updated in the code when the above trigger 59 * bits are modified via irq_set_irq_type() 60 * IRQ_PER_CPU - Mark an interrupt PER_CPU. Will protect 61 * it from affinity setting 62 * IRQ_NOPROBE - Interrupt cannot be probed by autoprobing 63 * IRQ_NOREQUEST - Interrupt cannot be requested via 64 * request_irq() 65 * IRQ_NOTHREAD - Interrupt cannot be threaded 66 * IRQ_NOAUTOEN - Interrupt is not automatically enabled in 67 * request/setup_irq() 68 * IRQ_NO_BALANCING - Interrupt cannot be balanced (affinity set) 69 * IRQ_MOVE_PCNTXT - Interrupt can be migrated from process context 70 * IRQ_NESTED_TRHEAD - Interrupt nests into another thread 71 * IRQ_PER_CPU_DEVID - Dev_id is a per-cpu variable 72 * IRQ_IS_POLLED - Always polled by another interrupt. Exclude 73 * it from the spurious interrupt detection 74 * mechanism and from core side polling. 75 */ 76 enum { 77 IRQ_TYPE_NONE = 0x00000000, 78 IRQ_TYPE_EDGE_RISING = 0x00000001, 79 IRQ_TYPE_EDGE_FALLING = 0x00000002, 80 IRQ_TYPE_EDGE_BOTH = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING), 81 IRQ_TYPE_LEVEL_HIGH = 0x00000004, 82 IRQ_TYPE_LEVEL_LOW = 0x00000008, 83 IRQ_TYPE_LEVEL_MASK = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH), 84 IRQ_TYPE_SENSE_MASK = 0x0000000f, 85 IRQ_TYPE_DEFAULT = IRQ_TYPE_SENSE_MASK, 86 87 IRQ_TYPE_PROBE = 0x00000010, 88 89 IRQ_LEVEL = (1 << 8), 90 IRQ_PER_CPU = (1 << 9), 91 IRQ_NOPROBE = (1 << 10), 92 IRQ_NOREQUEST = (1 << 11), 93 IRQ_NOAUTOEN = (1 << 12), 94 IRQ_NO_BALANCING = (1 << 13), 95 IRQ_MOVE_PCNTXT = (1 << 14), 96 IRQ_NESTED_THREAD = (1 << 15), 97 IRQ_NOTHREAD = (1 << 16), 98 IRQ_PER_CPU_DEVID = (1 << 17), 99 IRQ_IS_POLLED = (1 << 18), 100 }; 101 102 #define IRQF_MODIFY_MASK \ 103 (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \ 104 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \ 105 IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \ 106 IRQ_IS_POLLED) 107 108 #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) 109 110 /* 111 * Return value for chip->irq_set_affinity() 112 * 113 * IRQ_SET_MASK_OK - OK, core updates irq_data.affinity 114 * IRQ_SET_MASK_NOCPY - OK, chip did update irq_data.affinity 115 * IRQ_SET_MASK_OK_DONE - Same as IRQ_SET_MASK_OK for core. Special code to 116 * support stacked irqchips, which indicates skipping 117 * all descendent irqchips. 118 */ 119 enum { 120 IRQ_SET_MASK_OK = 0, 121 IRQ_SET_MASK_OK_NOCOPY, 122 IRQ_SET_MASK_OK_DONE, 123 }; 124 125 struct msi_desc; 126 struct irq_domain; 127 128 /** 129 * struct irq_common_data - per irq data shared by all irqchips 130 * @state_use_accessors: status information for irq chip functions. 131 * Use accessor functions to deal with it 132 */ 133 struct irq_common_data { 134 unsigned int state_use_accessors; 135 }; 136 137 /** 138 * struct irq_data - per irq chip data passed down to chip functions 139 * @mask: precomputed bitmask for accessing the chip registers 140 * @irq: interrupt number 141 * @hwirq: hardware interrupt number, local to the interrupt domain 142 * @node: node index useful for balancing 143 * @common: point to data shared by all irqchips 144 * @chip: low level interrupt hardware access 145 * @domain: Interrupt translation domain; responsible for mapping 146 * between hwirq number and linux irq number. 147 * @parent_data: pointer to parent struct irq_data to support hierarchy 148 * irq_domain 149 * @handler_data: per-IRQ data for the irq_chip methods 150 * @chip_data: platform-specific per-chip private data for the chip 151 * methods, to allow shared chip implementations 152 * @msi_desc: MSI descriptor 153 * @affinity: IRQ affinity on SMP 154 * 155 * The fields here need to overlay the ones in irq_desc until we 156 * cleaned up the direct references and switched everything over to 157 * irq_data. 158 */ 159 struct irq_data { 160 u32 mask; 161 unsigned int irq; 162 unsigned long hwirq; 163 unsigned int node; 164 struct irq_common_data *common; 165 struct irq_chip *chip; 166 struct irq_domain *domain; 167 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 168 struct irq_data *parent_data; 169 #endif 170 void *handler_data; 171 void *chip_data; 172 struct msi_desc *msi_desc; 173 cpumask_var_t affinity; 174 }; 175 176 /* 177 * Bit masks for irq_common_data.state_use_accessors 178 * 179 * IRQD_TRIGGER_MASK - Mask for the trigger type bits 180 * IRQD_SETAFFINITY_PENDING - Affinity setting is pending 181 * IRQD_NO_BALANCING - Balancing disabled for this IRQ 182 * IRQD_PER_CPU - Interrupt is per cpu 183 * IRQD_AFFINITY_SET - Interrupt affinity was set 184 * IRQD_LEVEL - Interrupt is level triggered 185 * IRQD_WAKEUP_STATE - Interrupt is configured for wakeup 186 * from suspend 187 * IRDQ_MOVE_PCNTXT - Interrupt can be moved in process 188 * context 189 * IRQD_IRQ_DISABLED - Disabled state of the interrupt 190 * IRQD_IRQ_MASKED - Masked state of the interrupt 191 * IRQD_IRQ_INPROGRESS - In progress state of the interrupt 192 * IRQD_WAKEUP_ARMED - Wakeup mode armed 193 */ 194 enum { 195 IRQD_TRIGGER_MASK = 0xf, 196 IRQD_SETAFFINITY_PENDING = (1 << 8), 197 IRQD_NO_BALANCING = (1 << 10), 198 IRQD_PER_CPU = (1 << 11), 199 IRQD_AFFINITY_SET = (1 << 12), 200 IRQD_LEVEL = (1 << 13), 201 IRQD_WAKEUP_STATE = (1 << 14), 202 IRQD_MOVE_PCNTXT = (1 << 15), 203 IRQD_IRQ_DISABLED = (1 << 16), 204 IRQD_IRQ_MASKED = (1 << 17), 205 IRQD_IRQ_INPROGRESS = (1 << 18), 206 IRQD_WAKEUP_ARMED = (1 << 19), 207 }; 208 209 #define __irqd_to_state(d) ((d)->common->state_use_accessors) 210 211 static inline bool irqd_is_setaffinity_pending(struct irq_data *d) 212 { 213 return __irqd_to_state(d) & IRQD_SETAFFINITY_PENDING; 214 } 215 216 static inline bool irqd_is_per_cpu(struct irq_data *d) 217 { 218 return __irqd_to_state(d) & IRQD_PER_CPU; 219 } 220 221 static inline bool irqd_can_balance(struct irq_data *d) 222 { 223 return !(__irqd_to_state(d) & (IRQD_PER_CPU | IRQD_NO_BALANCING)); 224 } 225 226 static inline bool irqd_affinity_was_set(struct irq_data *d) 227 { 228 return __irqd_to_state(d) & IRQD_AFFINITY_SET; 229 } 230 231 static inline void irqd_mark_affinity_was_set(struct irq_data *d) 232 { 233 __irqd_to_state(d) |= IRQD_AFFINITY_SET; 234 } 235 236 static inline u32 irqd_get_trigger_type(struct irq_data *d) 237 { 238 return __irqd_to_state(d) & IRQD_TRIGGER_MASK; 239 } 240 241 /* 242 * Must only be called inside irq_chip.irq_set_type() functions. 243 */ 244 static inline void irqd_set_trigger_type(struct irq_data *d, u32 type) 245 { 246 __irqd_to_state(d) &= ~IRQD_TRIGGER_MASK; 247 __irqd_to_state(d) |= type & IRQD_TRIGGER_MASK; 248 } 249 250 static inline bool irqd_is_level_type(struct irq_data *d) 251 { 252 return __irqd_to_state(d) & IRQD_LEVEL; 253 } 254 255 static inline bool irqd_is_wakeup_set(struct irq_data *d) 256 { 257 return __irqd_to_state(d) & IRQD_WAKEUP_STATE; 258 } 259 260 static inline bool irqd_can_move_in_process_context(struct irq_data *d) 261 { 262 return __irqd_to_state(d) & IRQD_MOVE_PCNTXT; 263 } 264 265 static inline bool irqd_irq_disabled(struct irq_data *d) 266 { 267 return __irqd_to_state(d) & IRQD_IRQ_DISABLED; 268 } 269 270 static inline bool irqd_irq_masked(struct irq_data *d) 271 { 272 return __irqd_to_state(d) & IRQD_IRQ_MASKED; 273 } 274 275 static inline bool irqd_irq_inprogress(struct irq_data *d) 276 { 277 return __irqd_to_state(d) & IRQD_IRQ_INPROGRESS; 278 } 279 280 static inline bool irqd_is_wakeup_armed(struct irq_data *d) 281 { 282 return __irqd_to_state(d) & IRQD_WAKEUP_ARMED; 283 } 284 285 286 /* 287 * Functions for chained handlers which can be enabled/disabled by the 288 * standard disable_irq/enable_irq calls. Must be called with 289 * irq_desc->lock held. 290 */ 291 static inline void irqd_set_chained_irq_inprogress(struct irq_data *d) 292 { 293 __irqd_to_state(d) |= IRQD_IRQ_INPROGRESS; 294 } 295 296 static inline void irqd_clr_chained_irq_inprogress(struct irq_data *d) 297 { 298 __irqd_to_state(d) &= ~IRQD_IRQ_INPROGRESS; 299 } 300 301 static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d) 302 { 303 return d->hwirq; 304 } 305 306 /** 307 * struct irq_chip - hardware interrupt chip descriptor 308 * 309 * @name: name for /proc/interrupts 310 * @irq_startup: start up the interrupt (defaults to ->enable if NULL) 311 * @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL) 312 * @irq_enable: enable the interrupt (defaults to chip->unmask if NULL) 313 * @irq_disable: disable the interrupt 314 * @irq_ack: start of a new interrupt 315 * @irq_mask: mask an interrupt source 316 * @irq_mask_ack: ack and mask an interrupt source 317 * @irq_unmask: unmask an interrupt source 318 * @irq_eoi: end of interrupt 319 * @irq_set_affinity: set the CPU affinity on SMP machines 320 * @irq_retrigger: resend an IRQ to the CPU 321 * @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ 322 * @irq_set_wake: enable/disable power-management wake-on of an IRQ 323 * @irq_bus_lock: function to lock access to slow bus (i2c) chips 324 * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips 325 * @irq_cpu_online: configure an interrupt source for a secondary CPU 326 * @irq_cpu_offline: un-configure an interrupt source for a secondary CPU 327 * @irq_suspend: function called from core code on suspend once per chip 328 * @irq_resume: function called from core code on resume once per chip 329 * @irq_pm_shutdown: function called from core code on shutdown once per chip 330 * @irq_calc_mask: Optional function to set irq_data.mask for special cases 331 * @irq_print_chip: optional to print special chip info in show_interrupts 332 * @irq_request_resources: optional to request resources before calling 333 * any other callback related to this irq 334 * @irq_release_resources: optional to release resources acquired with 335 * irq_request_resources 336 * @irq_compose_msi_msg: optional to compose message content for MSI 337 * @irq_write_msi_msg: optional to write message content for MSI 338 * @irq_get_irqchip_state: return the internal state of an interrupt 339 * @irq_set_irqchip_state: set the internal state of a interrupt 340 * @irq_set_vcpu_affinity: optional to target a vCPU in a virtual machine 341 * @flags: chip specific flags 342 */ 343 struct irq_chip { 344 const char *name; 345 unsigned int (*irq_startup)(struct irq_data *data); 346 void (*irq_shutdown)(struct irq_data *data); 347 void (*irq_enable)(struct irq_data *data); 348 void (*irq_disable)(struct irq_data *data); 349 350 void (*irq_ack)(struct irq_data *data); 351 void (*irq_mask)(struct irq_data *data); 352 void (*irq_mask_ack)(struct irq_data *data); 353 void (*irq_unmask)(struct irq_data *data); 354 void (*irq_eoi)(struct irq_data *data); 355 356 int (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force); 357 int (*irq_retrigger)(struct irq_data *data); 358 int (*irq_set_type)(struct irq_data *data, unsigned int flow_type); 359 int (*irq_set_wake)(struct irq_data *data, unsigned int on); 360 361 void (*irq_bus_lock)(struct irq_data *data); 362 void (*irq_bus_sync_unlock)(struct irq_data *data); 363 364 void (*irq_cpu_online)(struct irq_data *data); 365 void (*irq_cpu_offline)(struct irq_data *data); 366 367 void (*irq_suspend)(struct irq_data *data); 368 void (*irq_resume)(struct irq_data *data); 369 void (*irq_pm_shutdown)(struct irq_data *data); 370 371 void (*irq_calc_mask)(struct irq_data *data); 372 373 void (*irq_print_chip)(struct irq_data *data, struct seq_file *p); 374 int (*irq_request_resources)(struct irq_data *data); 375 void (*irq_release_resources)(struct irq_data *data); 376 377 void (*irq_compose_msi_msg)(struct irq_data *data, struct msi_msg *msg); 378 void (*irq_write_msi_msg)(struct irq_data *data, struct msi_msg *msg); 379 380 int (*irq_get_irqchip_state)(struct irq_data *data, enum irqchip_irq_state which, bool *state); 381 int (*irq_set_irqchip_state)(struct irq_data *data, enum irqchip_irq_state which, bool state); 382 383 int (*irq_set_vcpu_affinity)(struct irq_data *data, void *vcpu_info); 384 385 unsigned long flags; 386 }; 387 388 /* 389 * irq_chip specific flags 390 * 391 * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type() 392 * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled 393 * IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path 394 * IRQCHIP_ONOFFLINE_ENABLED: Only call irq_on/off_line callbacks 395 * when irq enabled 396 * IRQCHIP_SKIP_SET_WAKE: Skip chip.irq_set_wake(), for this irq chip 397 * IRQCHIP_ONESHOT_SAFE: One shot does not require mask/unmask 398 * IRQCHIP_EOI_THREADED: Chip requires eoi() on unmask in threaded mode 399 */ 400 enum { 401 IRQCHIP_SET_TYPE_MASKED = (1 << 0), 402 IRQCHIP_EOI_IF_HANDLED = (1 << 1), 403 IRQCHIP_MASK_ON_SUSPEND = (1 << 2), 404 IRQCHIP_ONOFFLINE_ENABLED = (1 << 3), 405 IRQCHIP_SKIP_SET_WAKE = (1 << 4), 406 IRQCHIP_ONESHOT_SAFE = (1 << 5), 407 IRQCHIP_EOI_THREADED = (1 << 6), 408 }; 409 410 #include <linux/irqdesc.h> 411 412 /* 413 * Pick up the arch-dependent methods: 414 */ 415 #include <asm/hw_irq.h> 416 417 #ifndef NR_IRQS_LEGACY 418 # define NR_IRQS_LEGACY 0 419 #endif 420 421 #ifndef ARCH_IRQ_INIT_FLAGS 422 # define ARCH_IRQ_INIT_FLAGS 0 423 #endif 424 425 #define IRQ_DEFAULT_INIT_FLAGS ARCH_IRQ_INIT_FLAGS 426 427 struct irqaction; 428 extern int setup_irq(unsigned int irq, struct irqaction *new); 429 extern void remove_irq(unsigned int irq, struct irqaction *act); 430 extern int setup_percpu_irq(unsigned int irq, struct irqaction *new); 431 extern void remove_percpu_irq(unsigned int irq, struct irqaction *act); 432 433 extern void irq_cpu_online(void); 434 extern void irq_cpu_offline(void); 435 extern int irq_set_affinity_locked(struct irq_data *data, 436 const struct cpumask *cpumask, bool force); 437 extern int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info); 438 439 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ) 440 void irq_move_irq(struct irq_data *data); 441 void irq_move_masked_irq(struct irq_data *data); 442 #else 443 static inline void irq_move_irq(struct irq_data *data) { } 444 static inline void irq_move_masked_irq(struct irq_data *data) { } 445 #endif 446 447 extern int no_irq_affinity; 448 449 #ifdef CONFIG_HARDIRQS_SW_RESEND 450 int irq_set_parent(int irq, int parent_irq); 451 #else 452 static inline int irq_set_parent(int irq, int parent_irq) 453 { 454 return 0; 455 } 456 #endif 457 458 /* 459 * Built-in IRQ handlers for various IRQ types, 460 * callable via desc->handle_irq() 461 */ 462 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc); 463 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); 464 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc); 465 extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc); 466 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc); 467 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc); 468 extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc); 469 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); 470 extern void handle_nested_irq(unsigned int irq); 471 472 extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg); 473 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 474 extern void irq_chip_enable_parent(struct irq_data *data); 475 extern void irq_chip_disable_parent(struct irq_data *data); 476 extern void irq_chip_ack_parent(struct irq_data *data); 477 extern int irq_chip_retrigger_hierarchy(struct irq_data *data); 478 extern void irq_chip_mask_parent(struct irq_data *data); 479 extern void irq_chip_unmask_parent(struct irq_data *data); 480 extern void irq_chip_eoi_parent(struct irq_data *data); 481 extern int irq_chip_set_affinity_parent(struct irq_data *data, 482 const struct cpumask *dest, 483 bool force); 484 extern int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on); 485 extern int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, 486 void *vcpu_info); 487 #endif 488 489 /* Handling of unhandled and spurious interrupts: */ 490 extern void note_interrupt(unsigned int irq, struct irq_desc *desc, 491 irqreturn_t action_ret); 492 493 494 /* Enable/disable irq debugging output: */ 495 extern int noirqdebug_setup(char *str); 496 497 /* Checks whether the interrupt can be requested by request_irq(): */ 498 extern int can_request_irq(unsigned int irq, unsigned long irqflags); 499 500 /* Dummy irq-chip implementations: */ 501 extern struct irq_chip no_irq_chip; 502 extern struct irq_chip dummy_irq_chip; 503 504 extern void 505 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, 506 irq_flow_handler_t handle, const char *name); 507 508 static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip, 509 irq_flow_handler_t handle) 510 { 511 irq_set_chip_and_handler_name(irq, chip, handle, NULL); 512 } 513 514 extern int irq_set_percpu_devid(unsigned int irq); 515 516 extern void 517 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, 518 const char *name); 519 520 static inline void 521 irq_set_handler(unsigned int irq, irq_flow_handler_t handle) 522 { 523 __irq_set_handler(irq, handle, 0, NULL); 524 } 525 526 /* 527 * Set a highlevel chained flow handler for a given IRQ. 528 * (a chained handler is automatically enabled and set to 529 * IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD) 530 */ 531 static inline void 532 irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle) 533 { 534 __irq_set_handler(irq, handle, 1, NULL); 535 } 536 537 /* 538 * Set a highlevel chained flow handler and its data for a given IRQ. 539 * (a chained handler is automatically enabled and set to 540 * IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD) 541 */ 542 void 543 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle, 544 void *data); 545 546 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set); 547 548 static inline void irq_set_status_flags(unsigned int irq, unsigned long set) 549 { 550 irq_modify_status(irq, 0, set); 551 } 552 553 static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr) 554 { 555 irq_modify_status(irq, clr, 0); 556 } 557 558 static inline void irq_set_noprobe(unsigned int irq) 559 { 560 irq_modify_status(irq, 0, IRQ_NOPROBE); 561 } 562 563 static inline void irq_set_probe(unsigned int irq) 564 { 565 irq_modify_status(irq, IRQ_NOPROBE, 0); 566 } 567 568 static inline void irq_set_nothread(unsigned int irq) 569 { 570 irq_modify_status(irq, 0, IRQ_NOTHREAD); 571 } 572 573 static inline void irq_set_thread(unsigned int irq) 574 { 575 irq_modify_status(irq, IRQ_NOTHREAD, 0); 576 } 577 578 static inline void irq_set_nested_thread(unsigned int irq, bool nest) 579 { 580 if (nest) 581 irq_set_status_flags(irq, IRQ_NESTED_THREAD); 582 else 583 irq_clear_status_flags(irq, IRQ_NESTED_THREAD); 584 } 585 586 static inline void irq_set_percpu_devid_flags(unsigned int irq) 587 { 588 irq_set_status_flags(irq, 589 IRQ_NOAUTOEN | IRQ_PER_CPU | IRQ_NOTHREAD | 590 IRQ_NOPROBE | IRQ_PER_CPU_DEVID); 591 } 592 593 /* Set/get chip/data for an IRQ: */ 594 extern int irq_set_chip(unsigned int irq, struct irq_chip *chip); 595 extern int irq_set_handler_data(unsigned int irq, void *data); 596 extern int irq_set_chip_data(unsigned int irq, void *data); 597 extern int irq_set_irq_type(unsigned int irq, unsigned int type); 598 extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry); 599 extern int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset, 600 struct msi_desc *entry); 601 extern struct irq_data *irq_get_irq_data(unsigned int irq); 602 603 static inline struct irq_chip *irq_get_chip(unsigned int irq) 604 { 605 struct irq_data *d = irq_get_irq_data(irq); 606 return d ? d->chip : NULL; 607 } 608 609 static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d) 610 { 611 return d->chip; 612 } 613 614 static inline void *irq_get_chip_data(unsigned int irq) 615 { 616 struct irq_data *d = irq_get_irq_data(irq); 617 return d ? d->chip_data : NULL; 618 } 619 620 static inline void *irq_data_get_irq_chip_data(struct irq_data *d) 621 { 622 return d->chip_data; 623 } 624 625 static inline void *irq_get_handler_data(unsigned int irq) 626 { 627 struct irq_data *d = irq_get_irq_data(irq); 628 return d ? d->handler_data : NULL; 629 } 630 631 static inline void *irq_data_get_irq_handler_data(struct irq_data *d) 632 { 633 return d->handler_data; 634 } 635 636 static inline struct msi_desc *irq_get_msi_desc(unsigned int irq) 637 { 638 struct irq_data *d = irq_get_irq_data(irq); 639 return d ? d->msi_desc : NULL; 640 } 641 642 static inline struct msi_desc *irq_data_get_msi(struct irq_data *d) 643 { 644 return d->msi_desc; 645 } 646 647 static inline u32 irq_get_trigger_type(unsigned int irq) 648 { 649 struct irq_data *d = irq_get_irq_data(irq); 650 return d ? irqd_get_trigger_type(d) : 0; 651 } 652 653 static inline int irq_data_get_node(struct irq_data *d) 654 { 655 return d->node; 656 } 657 658 static inline struct cpumask *irq_get_affinity_mask(int irq) 659 { 660 struct irq_data *d = irq_get_irq_data(irq); 661 662 return d ? d->affinity : NULL; 663 } 664 665 static inline struct cpumask *irq_data_get_affinity_mask(struct irq_data *d) 666 { 667 return d->affinity; 668 } 669 670 unsigned int arch_dynirq_lower_bound(unsigned int from); 671 672 int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node, 673 struct module *owner); 674 675 /* use macros to avoid needing export.h for THIS_MODULE */ 676 #define irq_alloc_descs(irq, from, cnt, node) \ 677 __irq_alloc_descs(irq, from, cnt, node, THIS_MODULE) 678 679 #define irq_alloc_desc(node) \ 680 irq_alloc_descs(-1, 0, 1, node) 681 682 #define irq_alloc_desc_at(at, node) \ 683 irq_alloc_descs(at, at, 1, node) 684 685 #define irq_alloc_desc_from(from, node) \ 686 irq_alloc_descs(-1, from, 1, node) 687 688 #define irq_alloc_descs_from(from, cnt, node) \ 689 irq_alloc_descs(-1, from, cnt, node) 690 691 void irq_free_descs(unsigned int irq, unsigned int cnt); 692 static inline void irq_free_desc(unsigned int irq) 693 { 694 irq_free_descs(irq, 1); 695 } 696 697 #ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ 698 unsigned int irq_alloc_hwirqs(int cnt, int node); 699 static inline unsigned int irq_alloc_hwirq(int node) 700 { 701 return irq_alloc_hwirqs(1, node); 702 } 703 void irq_free_hwirqs(unsigned int from, int cnt); 704 static inline void irq_free_hwirq(unsigned int irq) 705 { 706 return irq_free_hwirqs(irq, 1); 707 } 708 int arch_setup_hwirq(unsigned int irq, int node); 709 void arch_teardown_hwirq(unsigned int irq); 710 #endif 711 712 #ifdef CONFIG_GENERIC_IRQ_LEGACY 713 void irq_init_desc(unsigned int irq); 714 #endif 715 716 /** 717 * struct irq_chip_regs - register offsets for struct irq_gci 718 * @enable: Enable register offset to reg_base 719 * @disable: Disable register offset to reg_base 720 * @mask: Mask register offset to reg_base 721 * @ack: Ack register offset to reg_base 722 * @eoi: Eoi register offset to reg_base 723 * @type: Type configuration register offset to reg_base 724 * @polarity: Polarity configuration register offset to reg_base 725 */ 726 struct irq_chip_regs { 727 unsigned long enable; 728 unsigned long disable; 729 unsigned long mask; 730 unsigned long ack; 731 unsigned long eoi; 732 unsigned long type; 733 unsigned long polarity; 734 }; 735 736 /** 737 * struct irq_chip_type - Generic interrupt chip instance for a flow type 738 * @chip: The real interrupt chip which provides the callbacks 739 * @regs: Register offsets for this chip 740 * @handler: Flow handler associated with this chip 741 * @type: Chip can handle these flow types 742 * @mask_cache_priv: Cached mask register private to the chip type 743 * @mask_cache: Pointer to cached mask register 744 * 745 * A irq_generic_chip can have several instances of irq_chip_type when 746 * it requires different functions and register offsets for different 747 * flow types. 748 */ 749 struct irq_chip_type { 750 struct irq_chip chip; 751 struct irq_chip_regs regs; 752 irq_flow_handler_t handler; 753 u32 type; 754 u32 mask_cache_priv; 755 u32 *mask_cache; 756 }; 757 758 /** 759 * struct irq_chip_generic - Generic irq chip data structure 760 * @lock: Lock to protect register and cache data access 761 * @reg_base: Register base address (virtual) 762 * @reg_readl: Alternate I/O accessor (defaults to readl if NULL) 763 * @reg_writel: Alternate I/O accessor (defaults to writel if NULL) 764 * @irq_base: Interrupt base nr for this chip 765 * @irq_cnt: Number of interrupts handled by this chip 766 * @mask_cache: Cached mask register shared between all chip types 767 * @type_cache: Cached type register 768 * @polarity_cache: Cached polarity register 769 * @wake_enabled: Interrupt can wakeup from suspend 770 * @wake_active: Interrupt is marked as an wakeup from suspend source 771 * @num_ct: Number of available irq_chip_type instances (usually 1) 772 * @private: Private data for non generic chip callbacks 773 * @installed: bitfield to denote installed interrupts 774 * @unused: bitfield to denote unused interrupts 775 * @domain: irq domain pointer 776 * @list: List head for keeping track of instances 777 * @chip_types: Array of interrupt irq_chip_types 778 * 779 * Note, that irq_chip_generic can have multiple irq_chip_type 780 * implementations which can be associated to a particular irq line of 781 * an irq_chip_generic instance. That allows to share and protect 782 * state in an irq_chip_generic instance when we need to implement 783 * different flow mechanisms (level/edge) for it. 784 */ 785 struct irq_chip_generic { 786 raw_spinlock_t lock; 787 void __iomem *reg_base; 788 u32 (*reg_readl)(void __iomem *addr); 789 void (*reg_writel)(u32 val, void __iomem *addr); 790 unsigned int irq_base; 791 unsigned int irq_cnt; 792 u32 mask_cache; 793 u32 type_cache; 794 u32 polarity_cache; 795 u32 wake_enabled; 796 u32 wake_active; 797 unsigned int num_ct; 798 void *private; 799 unsigned long installed; 800 unsigned long unused; 801 struct irq_domain *domain; 802 struct list_head list; 803 struct irq_chip_type chip_types[0]; 804 }; 805 806 /** 807 * enum irq_gc_flags - Initialization flags for generic irq chips 808 * @IRQ_GC_INIT_MASK_CACHE: Initialize the mask_cache by reading mask reg 809 * @IRQ_GC_INIT_NESTED_LOCK: Set the lock class of the irqs to nested for 810 * irq chips which need to call irq_set_wake() on 811 * the parent irq. Usually GPIO implementations 812 * @IRQ_GC_MASK_CACHE_PER_TYPE: Mask cache is chip type private 813 * @IRQ_GC_NO_MASK: Do not calculate irq_data->mask 814 * @IRQ_GC_BE_IO: Use big-endian register accesses (default: LE) 815 */ 816 enum irq_gc_flags { 817 IRQ_GC_INIT_MASK_CACHE = 1 << 0, 818 IRQ_GC_INIT_NESTED_LOCK = 1 << 1, 819 IRQ_GC_MASK_CACHE_PER_TYPE = 1 << 2, 820 IRQ_GC_NO_MASK = 1 << 3, 821 IRQ_GC_BE_IO = 1 << 4, 822 }; 823 824 /* 825 * struct irq_domain_chip_generic - Generic irq chip data structure for irq domains 826 * @irqs_per_chip: Number of interrupts per chip 827 * @num_chips: Number of chips 828 * @irq_flags_to_set: IRQ* flags to set on irq setup 829 * @irq_flags_to_clear: IRQ* flags to clear on irq setup 830 * @gc_flags: Generic chip specific setup flags 831 * @gc: Array of pointers to generic interrupt chips 832 */ 833 struct irq_domain_chip_generic { 834 unsigned int irqs_per_chip; 835 unsigned int num_chips; 836 unsigned int irq_flags_to_clear; 837 unsigned int irq_flags_to_set; 838 enum irq_gc_flags gc_flags; 839 struct irq_chip_generic *gc[0]; 840 }; 841 842 /* Generic chip callback functions */ 843 void irq_gc_noop(struct irq_data *d); 844 void irq_gc_mask_disable_reg(struct irq_data *d); 845 void irq_gc_mask_set_bit(struct irq_data *d); 846 void irq_gc_mask_clr_bit(struct irq_data *d); 847 void irq_gc_unmask_enable_reg(struct irq_data *d); 848 void irq_gc_ack_set_bit(struct irq_data *d); 849 void irq_gc_ack_clr_bit(struct irq_data *d); 850 void irq_gc_mask_disable_reg_and_ack(struct irq_data *d); 851 void irq_gc_eoi(struct irq_data *d); 852 int irq_gc_set_wake(struct irq_data *d, unsigned int on); 853 854 /* Setup functions for irq_chip_generic */ 855 int irq_map_generic_chip(struct irq_domain *d, unsigned int virq, 856 irq_hw_number_t hw_irq); 857 struct irq_chip_generic * 858 irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base, 859 void __iomem *reg_base, irq_flow_handler_t handler); 860 void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk, 861 enum irq_gc_flags flags, unsigned int clr, 862 unsigned int set); 863 int irq_setup_alt_chip(struct irq_data *d, unsigned int type); 864 void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk, 865 unsigned int clr, unsigned int set); 866 867 struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq); 868 int irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip, 869 int num_ct, const char *name, 870 irq_flow_handler_t handler, 871 unsigned int clr, unsigned int set, 872 enum irq_gc_flags flags); 873 874 875 static inline struct irq_chip_type *irq_data_get_chip_type(struct irq_data *d) 876 { 877 return container_of(d->chip, struct irq_chip_type, chip); 878 } 879 880 #define IRQ_MSK(n) (u32)((n) < 32 ? ((1 << (n)) - 1) : UINT_MAX) 881 882 #ifdef CONFIG_SMP 883 static inline void irq_gc_lock(struct irq_chip_generic *gc) 884 { 885 raw_spin_lock(&gc->lock); 886 } 887 888 static inline void irq_gc_unlock(struct irq_chip_generic *gc) 889 { 890 raw_spin_unlock(&gc->lock); 891 } 892 #else 893 static inline void irq_gc_lock(struct irq_chip_generic *gc) { } 894 static inline void irq_gc_unlock(struct irq_chip_generic *gc) { } 895 #endif 896 897 static inline void irq_reg_writel(struct irq_chip_generic *gc, 898 u32 val, int reg_offset) 899 { 900 if (gc->reg_writel) 901 gc->reg_writel(val, gc->reg_base + reg_offset); 902 else 903 writel(val, gc->reg_base + reg_offset); 904 } 905 906 static inline u32 irq_reg_readl(struct irq_chip_generic *gc, 907 int reg_offset) 908 { 909 if (gc->reg_readl) 910 return gc->reg_readl(gc->reg_base + reg_offset); 911 else 912 return readl(gc->reg_base + reg_offset); 913 } 914 915 #endif /* _LINUX_IRQ_H */ 916