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
  14 #ifndef CONFIG_S390
  15
  16 #include <linux/linkage.h>
  17 #include <linux/cache.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/cpumask.h>
  20 #include <linux/irqreturn.h>
  21
  22 #include <asm/irq.h>
  23 #include <asm/ptrace.h>
  24 #include <asm/irq_regs.h>
  25
  26 struct irq_desc;
  27 typedef void fastcall (*irq_flow_handler_t)(unsigned int irq,
  28                                             struct irq_desc *desc);
  29
  30
  31 /*
  32  * IRQ line status.
  33  *
  34  * Bits 0-16 are reserved for the IRQF_* bits in linux/interrupt.h
  35  *
  36  * IRQ types
  37  */
  38 #define IRQ_TYPE_NONE           0x00000000      /* Default, unspecified type */
  39 #define IRQ_TYPE_EDGE_RISING    0x00000001      /* Edge rising type */
  40 #define IRQ_TYPE_EDGE_FALLING   0x00000002      /* Edge falling type */
  41 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
  42 #define IRQ_TYPE_LEVEL_HIGH     0x00000004      /* Level high type */
  43 #define IRQ_TYPE_LEVEL_LOW      0x00000008      /* Level low type */
  44 #define IRQ_TYPE_SENSE_MASK     0x0000000f      /* Mask of the above */
  45 #define IRQ_TYPE_PROBE          0x00000010      /* Probing in progress */
  46
  47 /* Internal flags */
  48 #define IRQ_INPROGRESS          0x00010000      /* IRQ handler active - do not enter! */
  49 #define IRQ_DISABLED            0x00020000      /* IRQ disabled - do not enter! */
  50 #define IRQ_PENDING             0x00040000      /* IRQ pending - replay on enable */
  51 #define IRQ_REPLAY              0x00080000      /* IRQ has been replayed but not acked yet */
  52 #define IRQ_AUTODETECT          0x00100000      /* IRQ is being autodetected */
  53 #define IRQ_WAITING             0x00200000      /* IRQ not yet seen - for autodetection */
  54 #define IRQ_LEVEL               0x00400000      /* IRQ level triggered */
  55 #define IRQ_MASKED              0x00800000      /* IRQ masked - shouldn't be seen again */
  56 #define IRQ_PER_CPU             0x01000000      /* IRQ is per CPU */
  57 #ifdef CONFIG_IRQ_PER_CPU
  58 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
  59 #else
  60 # define CHECK_IRQ_PER_CPU(var) 0
  61 #endif
  62
  63 #define IRQ_NOPROBE             0x02000000      /* IRQ is not valid for probing */
  64 #define IRQ_NOREQUEST           0x04000000      /* IRQ cannot be requested */
  65 #define IRQ_NOAUTOEN            0x08000000      /* IRQ will not be enabled on request irq */
  66 #define IRQ_DELAYED_DISABLE     0x10000000      /* IRQ disable (masking) happens delayed. */
  67 #define IRQ_WAKEUP              0x20000000      /* IRQ triggers system wakeup */
  68 #define IRQ_MOVE_PENDING        0x40000000      /* need to re-target IRQ destination */
  69
  70 struct proc_dir_entry;
  71
  72 /**
  73  * struct irq_chip - hardware interrupt chip descriptor
  74  *
  75  * @name:               name for /proc/interrupts
  76  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  77  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  78  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  79  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  80  * @ack:                start of a new interrupt
  81  * @mask:               mask an interrupt source
  82  * @mask_ack:           ack and mask an interrupt source
  83  * @unmask:             unmask an interrupt source
  84  * @eoi:                end of interrupt - chip level
  85  * @end:                end of interrupt - flow level
  86  * @set_affinity:       set the CPU affinity on SMP machines
  87  * @retrigger:          resend an IRQ to the CPU
  88  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
  89  * @set_wake:           enable/disable power-management wake-on of an IRQ
  90  *
  91  * @release:            release function solely used by UML
  92  * @typename:           obsoleted by name, kept as migration helper
  93  */
  94 struct irq_chip {
  95         const char      *name;
  96         unsigned int    (*startup)(unsigned int irq);
  97         void            (*shutdown)(unsigned int irq);
  98         void            (*enable)(unsigned int irq);
  99         void            (*disable)(unsigned int irq);
 100
 101         void            (*ack)(unsigned int irq);
 102         void            (*mask)(unsigned int irq);
 103         void            (*mask_ack)(unsigned int irq);
 104         void            (*unmask)(unsigned int irq);
 105         void            (*eoi)(unsigned int irq);
 106
 107         void            (*end)(unsigned int irq);
 108         void            (*set_affinity)(unsigned int irq, cpumask_t dest);
 109         int             (*retrigger)(unsigned int irq);
 110         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 111         int             (*set_wake)(unsigned int irq, unsigned int on);
 112
 113         /* Currently used only by UML, might disappear one day.*/
 114 #ifdef CONFIG_IRQ_RELEASE_METHOD
 115         void            (*release)(unsigned int irq, void *dev_id);
 116 #endif
 117         /*
 118          * For compatibility, ->typename is copied into ->name.
 119          * Will disappear.
 120          */
 121         const char      *typename;
 122 };
 123
 124 /**
 125  * struct irq_desc - interrupt descriptor
 126  *
 127  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 128  * @chip:               low level interrupt hardware access
 129  * @handler_data:       per-IRQ data for the irq_chip methods
 130  * @chip_data:          platform-specific per-chip private data for the chip
 131  *                      methods, to allow shared chip implementations
 132  * @action:             the irq action chain
 133  * @status:             status information
 134  * @depth:              disable-depth, for nested irq_disable() calls
 135  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
 136  * @irq_count:          stats field to detect stalled irqs
 137  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 138  * @lock:               locking for SMP
 139  * @affinity:           IRQ affinity on SMP
 140  * @cpu:                cpu index useful for balancing
 141  * @pending_mask:       pending rebalanced interrupts
 142  * @dir:                /proc/irq/ procfs entry
 143  * @affinity_entry:     /proc/irq/smp_affinity procfs entry on SMP
 144  *
 145  * Pad this out to 32 bytes for cache and indexing reasons.
 146  */
 147 struct irq_desc {
 148         irq_flow_handler_t      handle_irq;
 149         struct irq_chip         *chip;
 150         void                    *handler_data;
 151         void                    *chip_data;
 152         struct irqaction        *action;        /* IRQ action list */
 153         unsigned int            status;         /* IRQ status */
 154
 155         unsigned int            depth;          /* nested irq disables */
 156         unsigned int            wake_depth;     /* nested wake enables */
 157         unsigned int            irq_count;      /* For detecting broken IRQs */
 158         unsigned int            irqs_unhandled;
 159         spinlock_t              lock;
 160 #ifdef CONFIG_SMP
 161         cpumask_t               affinity;
 162         unsigned int            cpu;
 163 #endif
 164 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 165         cpumask_t               pending_mask;
 166 #endif
 167 #ifdef CONFIG_PROC_FS
 168         struct proc_dir_entry *dir;
 169 #endif
 170 } ____cacheline_aligned;
 171
 172 extern struct irq_desc irq_desc[NR_IRQS];
 173
 174 /*
 175  * Migration helpers for obsolete names, they will go away:
 176  */
 177 #define hw_interrupt_type       irq_chip
 178 typedef struct irq_chip         hw_irq_controller;
 179 #define no_irq_type             no_irq_chip
 180 typedef struct irq_desc         irq_desc_t;
 181
 182 /*
 183  * Pick up the arch-dependent methods:
 184  */
 185 #include <asm/hw_irq.h>
 186
 187 extern int setup_irq(unsigned int irq, struct irqaction *new);
 188
 189 #ifdef CONFIG_GENERIC_HARDIRQS
 190
 191 #ifndef handle_dynamic_tick
 192 # define handle_dynamic_tick(a)         do { } while (0)
 193 #endif
 194
 195 #ifdef CONFIG_SMP
 196 static inline void set_native_irq_info(int irq, cpumask_t mask)
 197 {
 198         irq_desc[irq].affinity = mask;
 199 }
 200 #else
 201 static inline void set_native_irq_info(int irq, cpumask_t mask)
 202 {
 203 }
 204 #endif
 205
 206 #ifdef CONFIG_SMP
 207
 208 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 209
 210 void set_pending_irq(unsigned int irq, cpumask_t mask);
 211 void move_native_irq(int irq);
 212 void move_masked_irq(int irq);
 213
 214 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
 215
 216 static inline void move_irq(int irq)
 217 {
 218 }
 219
 220 static inline void move_native_irq(int irq)
 221 {
 222 }
 223
 224 static inline void move_masked_irq(int irq)
 225 {
 226 }
 227
 228 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
 229 {
 230 }
 231
 232 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 233
 234 #else /* CONFIG_SMP */
 235
 236 #define move_native_irq(x)
 237 #define move_masked_irq(x)
 238
 239 #endif /* CONFIG_SMP */
 240
 241 #ifdef CONFIG_IRQBALANCE
 242 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
 243 #else
 244 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 245 {
 246 }
 247 #endif
 248
 249 #ifdef CONFIG_AUTO_IRQ_AFFINITY
 250 extern int select_smp_affinity(unsigned int irq);
 251 #else
 252 static inline int select_smp_affinity(unsigned int irq)
 253 {
 254         return 1;
 255 }
 256 #endif
 257
 258 extern int no_irq_affinity;
 259
 260 /* Handle irq action chains: */
 261 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
 262
 263 /*
 264  * Built-in IRQ handlers for various IRQ types,
 265  * callable via desc->chip->handle_irq()
 266  */
 267 extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc);
 268 extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 269 extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 270 extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 271 extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 272 extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 273
 274 /*
 275  * Get a descriptive string for the highlevel handler, for
 276  * /proc/interrupts output:
 277  */
 278 extern const char *handle_irq_name(irq_flow_handler_t handle);
 279
 280 /*
 281  * Monolithic do_IRQ implementation.
 282  * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
 283  */
 284 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 285 extern fastcall unsigned int __do_IRQ(unsigned int irq);
 286 #endif
 287
 288 /*
 289  * Architectures call this to let the generic IRQ layer
 290  * handle an interrupt. If the descriptor is attached to an
 291  * irqchip-style controller then we call the ->handle_irq() handler,
 292  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 293  */
 294 static inline void generic_handle_irq(unsigned int irq)
 295 {
 296         struct irq_desc *desc = irq_desc + irq;
 297
 298 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 299         desc->handle_irq(irq, desc);
 300 #else
 301         if (likely(desc->handle_irq))
 302                 desc->handle_irq(irq, desc);
 303         else
 304                 __do_IRQ(irq);
 305 #endif
 306 }
 307
 308 /* Handling of unhandled and spurious interrupts: */
 309 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 310                            int action_ret);
 311
 312 /* Resending of interrupts :*/
 313 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 314
 315 /* Initialize /proc/irq/ */
 316 extern void init_irq_proc(void);
 317
 318 /* Enable/disable irq debugging output: */
 319 extern int noirqdebug_setup(char *str);
 320
 321 /* Checks whether the interrupt can be requested by request_irq(): */
 322 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 323
 324 /* Dummy irq-chip implementations: */
 325 extern struct irq_chip no_irq_chip;
 326 extern struct irq_chip dummy_irq_chip;
 327
 328 extern void
 329 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 330                          irq_flow_handler_t handle);
 331 extern void
 332 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained);
 333
 334 /*
 335  * Set a highlevel flow handler for a given IRQ:
 336  */
 337 static inline void
 338 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
 339 {
 340         __set_irq_handler(irq, handle, 0);
 341 }
 342
 343 /*
 344  * Set a highlevel chained flow handler for a given IRQ.
 345  * (a chained handler is automatically enabled and set to
 346  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 347  */
 348 static inline void
 349 set_irq_chained_handler(unsigned int irq,
 350                         irq_flow_handler_t handle)
 351 {
 352         __set_irq_handler(irq, handle, 1);
 353 }
 354
 355 /* Handle dynamic irq creation and destruction */
 356 extern int create_irq(void);
 357 extern void destroy_irq(unsigned int irq);
 358
 359 /* Test to see if a driver has successfully requested an irq */
 360 static inline int irq_has_action(unsigned int irq)
 361 {
 362         struct irq_desc *desc = irq_desc + irq;
 363         return desc->action != NULL;
 364 }
 365
 366 /* Dynamic irq helper functions */
 367 extern void dynamic_irq_init(unsigned int irq);
 368 extern void dynamic_irq_cleanup(unsigned int irq);
 369
 370 /* Set/get chip/data for an IRQ: */
 371 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 372 extern int set_irq_data(unsigned int irq, void *data);
 373 extern int set_irq_chip_data(unsigned int irq, void *data);
 374 extern int set_irq_type(unsigned int irq, unsigned int type);
 375
 376 #define get_irq_chip(irq)       (irq_desc[irq].chip)
 377 #define get_irq_chip_data(irq)  (irq_desc[irq].chip_data)
 378 #define get_irq_data(irq)       (irq_desc[irq].handler_data)
 379
 380 #endif /* CONFIG_GENERIC_HARDIRQS */
 381
 382 #endif /* !CONFIG_S390 */
 383
 384 #endif /* _LINUX_IRQ_H */