Commit | Line | Data |
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06fcb0c6 IM |
1 | #ifndef _LINUX_IRQ_H |
2 | #define _LINUX_IRQ_H | |
1da177e4 LT |
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 | ||
23f9b317 | 12 | #include <linux/smp.h> |
1da177e4 | 13 | |
06fcb0c6 | 14 | #ifndef CONFIG_S390 |
1da177e4 LT |
15 | |
16 | #include <linux/linkage.h> | |
17 | #include <linux/cache.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/cpumask.h> | |
908dcecd | 20 | #include <linux/irqreturn.h> |
77904fd6 | 21 | #include <linux/errno.h> |
1da177e4 LT |
22 | |
23 | #include <asm/irq.h> | |
24 | #include <asm/ptrace.h> | |
7d12e780 | 25 | #include <asm/irq_regs.h> |
1da177e4 | 26 | |
57a58a94 | 27 | struct irq_desc; |
ec701584 | 28 | typedef void (*irq_flow_handler_t)(unsigned int irq, |
7d12e780 | 29 | struct irq_desc *desc); |
57a58a94 DH |
30 | |
31 | ||
1da177e4 LT |
32 | /* |
33 | * IRQ line status. | |
6e213616 | 34 | * |
950f4427 | 35 | * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h |
6e213616 TG |
36 | * |
37 | * IRQ types | |
1da177e4 | 38 | */ |
6e213616 TG |
39 | #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */ |
40 | #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */ | |
41 | #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */ | |
42 | #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) | |
43 | #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */ | |
44 | #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */ | |
45 | #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */ | |
46 | #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */ | |
47 | ||
48 | /* Internal flags */ | |
950f4427 TG |
49 | #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */ |
50 | #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */ | |
51 | #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */ | |
52 | #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */ | |
53 | #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */ | |
54 | #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */ | |
55 | #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */ | |
56 | #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */ | |
57 | #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */ | |
58 | #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */ | |
59 | #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */ | |
60 | #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */ | |
d7e25f33 IM |
61 | #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */ |
62 | #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ | |
63 | #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ | |
1adb0850 | 64 | #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ |
72b1e22d | 65 | #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */ |
950f4427 | 66 | |
0d7012a9 | 67 | #ifdef CONFIG_IRQ_PER_CPU |
f26fdd59 | 68 | # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) |
950f4427 | 69 | # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) |
f26fdd59 KW |
70 | #else |
71 | # define CHECK_IRQ_PER_CPU(var) 0 | |
950f4427 | 72 | # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING |
f26fdd59 | 73 | #endif |
1da177e4 | 74 | |
6a6de9ef | 75 | struct proc_dir_entry; |
5b912c10 | 76 | struct msi_desc; |
6a6de9ef | 77 | |
8fee5c36 | 78 | /** |
6a6de9ef | 79 | * struct irq_chip - hardware interrupt chip descriptor |
8fee5c36 IM |
80 | * |
81 | * @name: name for /proc/interrupts | |
82 | * @startup: start up the interrupt (defaults to ->enable if NULL) | |
83 | * @shutdown: shut down the interrupt (defaults to ->disable if NULL) | |
84 | * @enable: enable the interrupt (defaults to chip->unmask if NULL) | |
85 | * @disable: disable the interrupt (defaults to chip->mask if NULL) | |
8fee5c36 IM |
86 | * @ack: start of a new interrupt |
87 | * @mask: mask an interrupt source | |
88 | * @mask_ack: ack and mask an interrupt source | |
89 | * @unmask: unmask an interrupt source | |
47c2a3aa IM |
90 | * @eoi: end of interrupt - chip level |
91 | * @end: end of interrupt - flow level | |
8fee5c36 IM |
92 | * @set_affinity: set the CPU affinity on SMP machines |
93 | * @retrigger: resend an IRQ to the CPU | |
94 | * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ | |
95 | * @set_wake: enable/disable power-management wake-on of an IRQ | |
96 | * | |
97 | * @release: release function solely used by UML | |
6a6de9ef | 98 | * @typename: obsoleted by name, kept as migration helper |
1da177e4 | 99 | */ |
6a6de9ef TG |
100 | struct irq_chip { |
101 | const char *name; | |
71d218b7 IM |
102 | unsigned int (*startup)(unsigned int irq); |
103 | void (*shutdown)(unsigned int irq); | |
104 | void (*enable)(unsigned int irq); | |
105 | void (*disable)(unsigned int irq); | |
6a6de9ef | 106 | |
71d218b7 | 107 | void (*ack)(unsigned int irq); |
6a6de9ef TG |
108 | void (*mask)(unsigned int irq); |
109 | void (*mask_ack)(unsigned int irq); | |
110 | void (*unmask)(unsigned int irq); | |
47c2a3aa | 111 | void (*eoi)(unsigned int irq); |
6a6de9ef | 112 | |
71d218b7 IM |
113 | void (*end)(unsigned int irq); |
114 | void (*set_affinity)(unsigned int irq, cpumask_t dest); | |
c0ad90a3 | 115 | int (*retrigger)(unsigned int irq); |
6a6de9ef TG |
116 | int (*set_type)(unsigned int irq, unsigned int flow_type); |
117 | int (*set_wake)(unsigned int irq, unsigned int on); | |
c0ad90a3 | 118 | |
b77d6adc PBG |
119 | /* Currently used only by UML, might disappear one day.*/ |
120 | #ifdef CONFIG_IRQ_RELEASE_METHOD | |
71d218b7 | 121 | void (*release)(unsigned int irq, void *dev_id); |
b77d6adc | 122 | #endif |
6a6de9ef TG |
123 | /* |
124 | * For compatibility, ->typename is copied into ->name. | |
125 | * Will disappear. | |
126 | */ | |
127 | const char *typename; | |
1da177e4 LT |
128 | }; |
129 | ||
3060d6fe | 130 | struct timer_rand_state; |
8fee5c36 IM |
131 | /** |
132 | * struct irq_desc - interrupt descriptor | |
133 | * | |
6a6de9ef TG |
134 | * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] |
135 | * @chip: low level interrupt hardware access | |
472900b8 | 136 | * @msi_desc: MSI descriptor |
6a6de9ef TG |
137 | * @handler_data: per-IRQ data for the irq_chip methods |
138 | * @chip_data: platform-specific per-chip private data for the chip | |
139 | * methods, to allow shared chip implementations | |
8fee5c36 IM |
140 | * @action: the irq action chain |
141 | * @status: status information | |
142 | * @depth: disable-depth, for nested irq_disable() calls | |
15a647eb | 143 | * @wake_depth: enable depth, for multiple set_irq_wake() callers |
8fee5c36 IM |
144 | * @irq_count: stats field to detect stalled irqs |
145 | * @irqs_unhandled: stats field for spurious unhandled interrupts | |
5ac4d823 | 146 | * @last_unhandled: aging timer for unhandled count |
8fee5c36 IM |
147 | * @lock: locking for SMP |
148 | * @affinity: IRQ affinity on SMP | |
6a6de9ef | 149 | * @cpu: cpu index useful for balancing |
8fee5c36 | 150 | * @pending_mask: pending rebalanced interrupts |
8fee5c36 IM |
151 | * @dir: /proc/irq/ procfs entry |
152 | * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP | |
a460e745 | 153 | * @name: flow handler name for /proc/interrupts output |
1da177e4 | 154 | */ |
34ffdb72 | 155 | struct irq_desc { |
08678b08 YL |
156 | unsigned int irq; |
157 | #ifdef CONFIG_HAVE_SPARSE_IRQ | |
158 | struct irq_desc *next; | |
3060d6fe | 159 | struct timer_rand_state *timer_rand_state; |
08678b08 | 160 | #endif |
57a58a94 | 161 | irq_flow_handler_t handle_irq; |
6a6de9ef | 162 | struct irq_chip *chip; |
5b912c10 | 163 | struct msi_desc *msi_desc; |
6a6de9ef | 164 | void *handler_data; |
71d218b7 IM |
165 | void *chip_data; |
166 | struct irqaction *action; /* IRQ action list */ | |
167 | unsigned int status; /* IRQ status */ | |
6a6de9ef | 168 | |
71d218b7 | 169 | unsigned int depth; /* nested irq disables */ |
15a647eb | 170 | unsigned int wake_depth; /* nested wake enables */ |
71d218b7 IM |
171 | unsigned int irq_count; /* For detecting broken IRQs */ |
172 | unsigned int irqs_unhandled; | |
4f27c00b | 173 | unsigned long last_unhandled; /* Aging timer for unhandled count */ |
71d218b7 | 174 | spinlock_t lock; |
a53da52f | 175 | #ifdef CONFIG_SMP |
71d218b7 | 176 | cpumask_t affinity; |
6a6de9ef | 177 | unsigned int cpu; |
a53da52f | 178 | #endif |
06fcb0c6 | 179 | #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) |
cd916d31 | 180 | cpumask_t pending_mask; |
54d5d424 | 181 | #endif |
4a733ee1 | 182 | #ifdef CONFIG_PROC_FS |
a460e745 | 183 | struct proc_dir_entry *dir; |
4a733ee1 | 184 | #endif |
a460e745 | 185 | const char *name; |
e729aa16 | 186 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 187 | |
08678b08 YL |
188 | extern struct irq_desc *irq_to_desc(unsigned int irq); |
189 | #ifndef CONFIG_HAVE_DYN_ARRAY | |
190 | /* could be removed if we get rid of all irq_desc reference */ | |
34ffdb72 | 191 | extern struct irq_desc irq_desc[NR_IRQS]; |
d60458b2 | 192 | #endif |
1da177e4 | 193 | |
34ffdb72 IM |
194 | /* |
195 | * Migration helpers for obsolete names, they will go away: | |
196 | */ | |
6a6de9ef TG |
197 | #define hw_interrupt_type irq_chip |
198 | typedef struct irq_chip hw_irq_controller; | |
199 | #define no_irq_type no_irq_chip | |
34ffdb72 IM |
200 | typedef struct irq_desc irq_desc_t; |
201 | ||
202 | /* | |
203 | * Pick up the arch-dependent methods: | |
204 | */ | |
205 | #include <asm/hw_irq.h> | |
1da177e4 | 206 | |
06fcb0c6 | 207 | extern int setup_irq(unsigned int irq, struct irqaction *new); |
1da177e4 LT |
208 | |
209 | #ifdef CONFIG_GENERIC_HARDIRQS | |
06fcb0c6 | 210 | |
54d5d424 AR |
211 | #ifdef CONFIG_SMP |
212 | ||
06fcb0c6 | 213 | #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) |
54d5d424 | 214 | |
c777ac55 AM |
215 | void set_pending_irq(unsigned int irq, cpumask_t mask); |
216 | void move_native_irq(int irq); | |
e7b946e9 | 217 | void move_masked_irq(int irq); |
54d5d424 | 218 | |
06fcb0c6 IM |
219 | #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */ |
220 | ||
221 | static inline void move_irq(int irq) | |
222 | { | |
223 | } | |
224 | ||
225 | static inline void move_native_irq(int irq) | |
226 | { | |
227 | } | |
228 | ||
e7b946e9 EB |
229 | static inline void move_masked_irq(int irq) |
230 | { | |
231 | } | |
232 | ||
06fcb0c6 IM |
233 | static inline void set_pending_irq(unsigned int irq, cpumask_t mask) |
234 | { | |
235 | } | |
54d5d424 | 236 | |
06fcb0c6 | 237 | #endif /* CONFIG_GENERIC_PENDING_IRQ */ |
54d5d424 | 238 | |
06fcb0c6 | 239 | #else /* CONFIG_SMP */ |
54d5d424 | 240 | |
54d5d424 | 241 | #define move_native_irq(x) |
e7b946e9 | 242 | #define move_masked_irq(x) |
54d5d424 | 243 | |
06fcb0c6 | 244 | #endif /* CONFIG_SMP */ |
54d5d424 | 245 | |
1b61b910 ZY |
246 | #ifdef CONFIG_IRQBALANCE |
247 | extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask); | |
248 | #else | |
249 | static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) | |
250 | { | |
251 | } | |
252 | #endif | |
253 | ||
1da177e4 | 254 | extern int no_irq_affinity; |
1da177e4 | 255 | |
950f4427 TG |
256 | static inline int irq_balancing_disabled(unsigned int irq) |
257 | { | |
08678b08 YL |
258 | struct irq_desc *desc; |
259 | ||
260 | desc = irq_to_desc(irq); | |
261 | return desc->status & IRQ_NO_BALANCING_MASK; | |
950f4427 TG |
262 | } |
263 | ||
6a6de9ef | 264 | /* Handle irq action chains: */ |
7d12e780 | 265 | extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); |
6a6de9ef TG |
266 | |
267 | /* | |
268 | * Built-in IRQ handlers for various IRQ types, | |
269 | * callable via desc->chip->handle_irq() | |
270 | */ | |
ec701584 HH |
271 | extern void handle_level_irq(unsigned int irq, struct irq_desc *desc); |
272 | extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); | |
273 | extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc); | |
274 | extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc); | |
275 | extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc); | |
276 | extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); | |
6a6de9ef | 277 | |
2e60bbb6 | 278 | /* |
6a6de9ef | 279 | * Monolithic do_IRQ implementation. |
2e60bbb6 | 280 | */ |
af8c65b5 | 281 | #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
ec701584 | 282 | extern unsigned int __do_IRQ(unsigned int irq); |
af8c65b5 | 283 | #endif |
2e60bbb6 | 284 | |
dae86204 IM |
285 | /* |
286 | * Architectures call this to let the generic IRQ layer | |
287 | * handle an interrupt. If the descriptor is attached to an | |
288 | * irqchip-style controller then we call the ->handle_irq() handler, | |
289 | * and it calls __do_IRQ() if it's attached to an irqtype-style controller. | |
290 | */ | |
7d12e780 | 291 | static inline void generic_handle_irq(unsigned int irq) |
dae86204 | 292 | { |
08678b08 | 293 | struct irq_desc *desc = irq_to_desc(irq); |
dae86204 | 294 | |
af8c65b5 | 295 | #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
7d12e780 | 296 | desc->handle_irq(irq, desc); |
af8c65b5 | 297 | #else |
dae86204 | 298 | if (likely(desc->handle_irq)) |
7d12e780 | 299 | desc->handle_irq(irq, desc); |
dae86204 | 300 | else |
7d12e780 | 301 | __do_IRQ(irq); |
af8c65b5 | 302 | #endif |
dae86204 IM |
303 | } |
304 | ||
6a6de9ef | 305 | /* Handling of unhandled and spurious interrupts: */ |
34ffdb72 | 306 | extern void note_interrupt(unsigned int irq, struct irq_desc *desc, |
7d12e780 | 307 | int action_ret); |
1da177e4 | 308 | |
a4633adc TG |
309 | /* Resending of interrupts :*/ |
310 | void check_irq_resend(struct irq_desc *desc, unsigned int irq); | |
311 | ||
6a6de9ef TG |
312 | /* Enable/disable irq debugging output: */ |
313 | extern int noirqdebug_setup(char *str); | |
314 | ||
315 | /* Checks whether the interrupt can be requested by request_irq(): */ | |
316 | extern int can_request_irq(unsigned int irq, unsigned long irqflags); | |
317 | ||
f8b5473f | 318 | /* Dummy irq-chip implementations: */ |
6a6de9ef | 319 | extern struct irq_chip no_irq_chip; |
f8b5473f | 320 | extern struct irq_chip dummy_irq_chip; |
6a6de9ef | 321 | |
145fc655 IM |
322 | extern void |
323 | set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, | |
324 | irq_flow_handler_t handle); | |
6a6de9ef | 325 | extern void |
a460e745 IM |
326 | set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, |
327 | irq_flow_handler_t handle, const char *name); | |
328 | ||
6a6de9ef | 329 | extern void |
a460e745 IM |
330 | __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, |
331 | const char *name); | |
1da177e4 | 332 | |
b019e573 KH |
333 | /* caller has locked the irq_desc and both params are valid */ |
334 | static inline void __set_irq_handler_unlocked(int irq, | |
335 | irq_flow_handler_t handler) | |
336 | { | |
08678b08 YL |
337 | struct irq_desc *desc; |
338 | ||
339 | desc = irq_to_desc(irq); | |
340 | desc->handle_irq = handler; | |
b019e573 KH |
341 | } |
342 | ||
6a6de9ef TG |
343 | /* |
344 | * Set a highlevel flow handler for a given IRQ: | |
345 | */ | |
346 | static inline void | |
57a58a94 | 347 | set_irq_handler(unsigned int irq, irq_flow_handler_t handle) |
6a6de9ef | 348 | { |
a460e745 | 349 | __set_irq_handler(irq, handle, 0, NULL); |
6a6de9ef TG |
350 | } |
351 | ||
352 | /* | |
353 | * Set a highlevel chained flow handler for a given IRQ. | |
354 | * (a chained handler is automatically enabled and set to | |
355 | * IRQ_NOREQUEST and IRQ_NOPROBE) | |
356 | */ | |
357 | static inline void | |
358 | set_irq_chained_handler(unsigned int irq, | |
57a58a94 | 359 | irq_flow_handler_t handle) |
6a6de9ef | 360 | { |
a460e745 | 361 | __set_irq_handler(irq, handle, 1, NULL); |
6a6de9ef TG |
362 | } |
363 | ||
46f4f8f6 RB |
364 | extern void set_irq_noprobe(unsigned int irq); |
365 | extern void set_irq_probe(unsigned int irq); | |
366 | ||
3a16d713 EB |
367 | /* Handle dynamic irq creation and destruction */ |
368 | extern int create_irq(void); | |
369 | extern void destroy_irq(unsigned int irq); | |
370 | ||
1f80025e EB |
371 | /* Test to see if a driver has successfully requested an irq */ |
372 | static inline int irq_has_action(unsigned int irq) | |
373 | { | |
08678b08 | 374 | struct irq_desc *desc = irq_to_desc(irq); |
1f80025e EB |
375 | return desc->action != NULL; |
376 | } | |
377 | ||
3a16d713 EB |
378 | /* Dynamic irq helper functions */ |
379 | extern void dynamic_irq_init(unsigned int irq); | |
380 | extern void dynamic_irq_cleanup(unsigned int irq); | |
dd87eb3a | 381 | |
3a16d713 | 382 | /* Set/get chip/data for an IRQ: */ |
dd87eb3a TG |
383 | extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); |
384 | extern int set_irq_data(unsigned int irq, void *data); | |
385 | extern int set_irq_chip_data(unsigned int irq, void *data); | |
386 | extern int set_irq_type(unsigned int irq, unsigned int type); | |
5b912c10 | 387 | extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); |
dd87eb3a | 388 | |
08678b08 YL |
389 | #define get_irq_chip(irq) (irq_to_desc(irq)->chip) |
390 | #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data) | |
391 | #define get_irq_data(irq) (irq_to_desc(irq)->handler_data) | |
392 | #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc) | |
dd87eb3a | 393 | |
6a6de9ef | 394 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 395 | |
06fcb0c6 | 396 | #endif /* !CONFIG_S390 */ |
1da177e4 | 397 | |
06fcb0c6 | 398 | #endif /* _LINUX_IRQ_H */ |