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> |
dd3a1db9 | 21 | #include <linux/irqnr.h> |
77904fd6 | 22 | #include <linux/errno.h> |
1da177e4 LT |
23 | |
24 | #include <asm/irq.h> | |
25 | #include <asm/ptrace.h> | |
7d12e780 | 26 | #include <asm/irq_regs.h> |
1da177e4 | 27 | |
57a58a94 | 28 | struct irq_desc; |
ec701584 | 29 | typedef void (*irq_flow_handler_t)(unsigned int irq, |
7d12e780 | 30 | struct irq_desc *desc); |
57a58a94 DH |
31 | |
32 | ||
1da177e4 LT |
33 | /* |
34 | * IRQ line status. | |
6e213616 | 35 | * |
950f4427 | 36 | * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h |
6e213616 TG |
37 | * |
38 | * IRQ types | |
1da177e4 | 39 | */ |
6e213616 TG |
40 | #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */ |
41 | #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */ | |
42 | #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */ | |
43 | #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) | |
44 | #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */ | |
45 | #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */ | |
46 | #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */ | |
47 | #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */ | |
48 | ||
49 | /* Internal flags */ | |
950f4427 TG |
50 | #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */ |
51 | #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */ | |
52 | #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */ | |
53 | #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */ | |
54 | #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */ | |
55 | #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */ | |
56 | #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */ | |
57 | #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */ | |
58 | #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */ | |
59 | #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */ | |
60 | #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */ | |
61 | #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */ | |
d7e25f33 IM |
62 | #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */ |
63 | #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ | |
64 | #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ | |
1adb0850 | 65 | #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ |
72b1e22d | 66 | #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */ |
950f4427 | 67 | |
0d7012a9 | 68 | #ifdef CONFIG_IRQ_PER_CPU |
f26fdd59 | 69 | # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) |
950f4427 | 70 | # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) |
f26fdd59 KW |
71 | #else |
72 | # define CHECK_IRQ_PER_CPU(var) 0 | |
950f4427 | 73 | # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING |
f26fdd59 | 74 | #endif |
1da177e4 | 75 | |
6a6de9ef | 76 | struct proc_dir_entry; |
5b912c10 | 77 | struct msi_desc; |
6a6de9ef | 78 | |
8fee5c36 | 79 | /** |
6a6de9ef | 80 | * struct irq_chip - hardware interrupt chip descriptor |
8fee5c36 IM |
81 | * |
82 | * @name: name for /proc/interrupts | |
83 | * @startup: start up the interrupt (defaults to ->enable if NULL) | |
84 | * @shutdown: shut down the interrupt (defaults to ->disable if NULL) | |
85 | * @enable: enable the interrupt (defaults to chip->unmask if NULL) | |
86 | * @disable: disable the interrupt (defaults to chip->mask if NULL) | |
8fee5c36 IM |
87 | * @ack: start of a new interrupt |
88 | * @mask: mask an interrupt source | |
89 | * @mask_ack: ack and mask an interrupt source | |
90 | * @unmask: unmask an interrupt source | |
47c2a3aa IM |
91 | * @eoi: end of interrupt - chip level |
92 | * @end: end of interrupt - flow level | |
8fee5c36 IM |
93 | * @set_affinity: set the CPU affinity on SMP machines |
94 | * @retrigger: resend an IRQ to the CPU | |
95 | * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ | |
96 | * @set_wake: enable/disable power-management wake-on of an IRQ | |
97 | * | |
98 | * @release: release function solely used by UML | |
6a6de9ef | 99 | * @typename: obsoleted by name, kept as migration helper |
1da177e4 | 100 | */ |
6a6de9ef TG |
101 | struct irq_chip { |
102 | const char *name; | |
71d218b7 IM |
103 | unsigned int (*startup)(unsigned int irq); |
104 | void (*shutdown)(unsigned int irq); | |
105 | void (*enable)(unsigned int irq); | |
106 | void (*disable)(unsigned int irq); | |
6a6de9ef | 107 | |
71d218b7 | 108 | void (*ack)(unsigned int irq); |
6a6de9ef TG |
109 | void (*mask)(unsigned int irq); |
110 | void (*mask_ack)(unsigned int irq); | |
111 | void (*unmask)(unsigned int irq); | |
47c2a3aa | 112 | void (*eoi)(unsigned int irq); |
6a6de9ef | 113 | |
71d218b7 IM |
114 | void (*end)(unsigned int irq); |
115 | void (*set_affinity)(unsigned int irq, cpumask_t dest); | |
c0ad90a3 | 116 | int (*retrigger)(unsigned int irq); |
6a6de9ef TG |
117 | int (*set_type)(unsigned int irq, unsigned int flow_type); |
118 | int (*set_wake)(unsigned int irq, unsigned int on); | |
c0ad90a3 | 119 | |
b77d6adc PBG |
120 | /* Currently used only by UML, might disappear one day.*/ |
121 | #ifdef CONFIG_IRQ_RELEASE_METHOD | |
71d218b7 | 122 | void (*release)(unsigned int irq, void *dev_id); |
b77d6adc | 123 | #endif |
6a6de9ef TG |
124 | /* |
125 | * For compatibility, ->typename is copied into ->name. | |
126 | * Will disappear. | |
127 | */ | |
128 | const char *typename; | |
1da177e4 LT |
129 | }; |
130 | ||
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 | 156 | unsigned int irq; |
57a58a94 | 157 | irq_flow_handler_t handle_irq; |
6a6de9ef | 158 | struct irq_chip *chip; |
5b912c10 | 159 | struct msi_desc *msi_desc; |
6a6de9ef | 160 | void *handler_data; |
71d218b7 IM |
161 | void *chip_data; |
162 | struct irqaction *action; /* IRQ action list */ | |
163 | unsigned int status; /* IRQ status */ | |
6a6de9ef | 164 | |
71d218b7 | 165 | unsigned int depth; /* nested irq disables */ |
15a647eb | 166 | unsigned int wake_depth; /* nested wake enables */ |
71d218b7 IM |
167 | unsigned int irq_count; /* For detecting broken IRQs */ |
168 | unsigned int irqs_unhandled; | |
4f27c00b | 169 | unsigned long last_unhandled; /* Aging timer for unhandled count */ |
71d218b7 | 170 | spinlock_t lock; |
a53da52f | 171 | #ifdef CONFIG_SMP |
71d218b7 | 172 | cpumask_t affinity; |
6a6de9ef | 173 | unsigned int cpu; |
a53da52f | 174 | #endif |
8b8e8c1b | 175 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
cd916d31 | 176 | cpumask_t pending_mask; |
54d5d424 | 177 | #endif |
4a733ee1 | 178 | #ifdef CONFIG_PROC_FS |
a460e745 | 179 | struct proc_dir_entry *dir; |
4a733ee1 | 180 | #endif |
a460e745 | 181 | const char *name; |
e729aa16 | 182 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 183 | |
9059d8fa | 184 | |
34ffdb72 | 185 | extern struct irq_desc irq_desc[NR_IRQS]; |
9059d8fa | 186 | |
c6b7674f TG |
187 | static inline struct irq_desc *irq_to_desc(unsigned int irq) |
188 | { | |
189 | return (irq < nr_irqs) ? irq_desc + irq : NULL; | |
190 | } | |
191 | ||
34ffdb72 IM |
192 | /* |
193 | * Migration helpers for obsolete names, they will go away: | |
194 | */ | |
6a6de9ef TG |
195 | #define hw_interrupt_type irq_chip |
196 | typedef struct irq_chip hw_irq_controller; | |
197 | #define no_irq_type no_irq_chip | |
34ffdb72 IM |
198 | typedef struct irq_desc irq_desc_t; |
199 | ||
200 | /* | |
201 | * Pick up the arch-dependent methods: | |
202 | */ | |
203 | #include <asm/hw_irq.h> | |
1da177e4 | 204 | |
06fcb0c6 | 205 | extern int setup_irq(unsigned int irq, struct irqaction *new); |
1da177e4 LT |
206 | |
207 | #ifdef CONFIG_GENERIC_HARDIRQS | |
06fcb0c6 | 208 | |
54d5d424 AR |
209 | #ifdef CONFIG_SMP |
210 | ||
8b8e8c1b | 211 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
54d5d424 | 212 | |
c777ac55 AM |
213 | void set_pending_irq(unsigned int irq, cpumask_t mask); |
214 | void move_native_irq(int irq); | |
e7b946e9 | 215 | void move_masked_irq(int irq); |
54d5d424 | 216 | |
8b8e8c1b | 217 | #else /* CONFIG_GENERIC_PENDING_IRQ */ |
06fcb0c6 IM |
218 | |
219 | static inline void move_irq(int irq) | |
220 | { | |
221 | } | |
222 | ||
223 | static inline void move_native_irq(int irq) | |
224 | { | |
225 | } | |
226 | ||
e7b946e9 EB |
227 | static inline void move_masked_irq(int irq) |
228 | { | |
229 | } | |
230 | ||
06fcb0c6 IM |
231 | static inline void set_pending_irq(unsigned int irq, cpumask_t mask) |
232 | { | |
233 | } | |
54d5d424 | 234 | |
06fcb0c6 | 235 | #endif /* CONFIG_GENERIC_PENDING_IRQ */ |
54d5d424 | 236 | |
06fcb0c6 | 237 | #else /* CONFIG_SMP */ |
54d5d424 | 238 | |
54d5d424 | 239 | #define move_native_irq(x) |
e7b946e9 | 240 | #define move_masked_irq(x) |
54d5d424 | 241 | |
06fcb0c6 | 242 | #endif /* CONFIG_SMP */ |
54d5d424 | 243 | |
1da177e4 | 244 | extern int no_irq_affinity; |
1da177e4 | 245 | |
950f4427 TG |
246 | static inline int irq_balancing_disabled(unsigned int irq) |
247 | { | |
08678b08 YL |
248 | struct irq_desc *desc; |
249 | ||
250 | desc = irq_to_desc(irq); | |
251 | return desc->status & IRQ_NO_BALANCING_MASK; | |
950f4427 TG |
252 | } |
253 | ||
6a6de9ef | 254 | /* Handle irq action chains: */ |
7d12e780 | 255 | extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); |
6a6de9ef TG |
256 | |
257 | /* | |
258 | * Built-in IRQ handlers for various IRQ types, | |
259 | * callable via desc->chip->handle_irq() | |
260 | */ | |
ec701584 HH |
261 | extern void handle_level_irq(unsigned int irq, struct irq_desc *desc); |
262 | extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); | |
263 | extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc); | |
264 | extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc); | |
265 | extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc); | |
266 | extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); | |
6a6de9ef | 267 | |
2e60bbb6 | 268 | /* |
6a6de9ef | 269 | * Monolithic do_IRQ implementation. |
2e60bbb6 | 270 | */ |
af8c65b5 | 271 | #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
ec701584 | 272 | extern unsigned int __do_IRQ(unsigned int irq); |
af8c65b5 | 273 | #endif |
2e60bbb6 | 274 | |
dae86204 IM |
275 | /* |
276 | * Architectures call this to let the generic IRQ layer | |
277 | * handle an interrupt. If the descriptor is attached to an | |
278 | * irqchip-style controller then we call the ->handle_irq() handler, | |
279 | * and it calls __do_IRQ() if it's attached to an irqtype-style controller. | |
280 | */ | |
46926b67 | 281 | static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) |
dae86204 | 282 | { |
af8c65b5 | 283 | #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
7d12e780 | 284 | desc->handle_irq(irq, desc); |
af8c65b5 | 285 | #else |
dae86204 | 286 | if (likely(desc->handle_irq)) |
7d12e780 | 287 | desc->handle_irq(irq, desc); |
dae86204 | 288 | else |
7d12e780 | 289 | __do_IRQ(irq); |
af8c65b5 | 290 | #endif |
dae86204 IM |
291 | } |
292 | ||
46926b67 YL |
293 | static inline void generic_handle_irq(unsigned int irq) |
294 | { | |
295 | generic_handle_irq_desc(irq, irq_to_desc(irq)); | |
296 | } | |
297 | ||
6a6de9ef | 298 | /* Handling of unhandled and spurious interrupts: */ |
34ffdb72 | 299 | extern void note_interrupt(unsigned int irq, struct irq_desc *desc, |
7d12e780 | 300 | int action_ret); |
1da177e4 | 301 | |
a4633adc TG |
302 | /* Resending of interrupts :*/ |
303 | void check_irq_resend(struct irq_desc *desc, unsigned int irq); | |
304 | ||
6a6de9ef TG |
305 | /* Enable/disable irq debugging output: */ |
306 | extern int noirqdebug_setup(char *str); | |
307 | ||
308 | /* Checks whether the interrupt can be requested by request_irq(): */ | |
309 | extern int can_request_irq(unsigned int irq, unsigned long irqflags); | |
310 | ||
f8b5473f | 311 | /* Dummy irq-chip implementations: */ |
6a6de9ef | 312 | extern struct irq_chip no_irq_chip; |
f8b5473f | 313 | extern struct irq_chip dummy_irq_chip; |
6a6de9ef | 314 | |
145fc655 IM |
315 | extern void |
316 | set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, | |
317 | irq_flow_handler_t handle); | |
6a6de9ef | 318 | extern void |
a460e745 IM |
319 | set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, |
320 | irq_flow_handler_t handle, const char *name); | |
321 | ||
6a6de9ef | 322 | extern void |
a460e745 IM |
323 | __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, |
324 | const char *name); | |
1da177e4 | 325 | |
b019e573 KH |
326 | /* caller has locked the irq_desc and both params are valid */ |
327 | static inline void __set_irq_handler_unlocked(int irq, | |
328 | irq_flow_handler_t handler) | |
329 | { | |
08678b08 YL |
330 | struct irq_desc *desc; |
331 | ||
332 | desc = irq_to_desc(irq); | |
333 | desc->handle_irq = handler; | |
b019e573 KH |
334 | } |
335 | ||
6a6de9ef TG |
336 | /* |
337 | * Set a highlevel flow handler for a given IRQ: | |
338 | */ | |
339 | static inline void | |
57a58a94 | 340 | set_irq_handler(unsigned int irq, irq_flow_handler_t handle) |
6a6de9ef | 341 | { |
a460e745 | 342 | __set_irq_handler(irq, handle, 0, NULL); |
6a6de9ef TG |
343 | } |
344 | ||
345 | /* | |
346 | * Set a highlevel chained flow handler for a given IRQ. | |
347 | * (a chained handler is automatically enabled and set to | |
348 | * IRQ_NOREQUEST and IRQ_NOPROBE) | |
349 | */ | |
350 | static inline void | |
351 | set_irq_chained_handler(unsigned int irq, | |
57a58a94 | 352 | irq_flow_handler_t handle) |
6a6de9ef | 353 | { |
a460e745 | 354 | __set_irq_handler(irq, handle, 1, NULL); |
6a6de9ef TG |
355 | } |
356 | ||
46f4f8f6 RB |
357 | extern void set_irq_noprobe(unsigned int irq); |
358 | extern void set_irq_probe(unsigned int irq); | |
359 | ||
3a16d713 | 360 | /* Handle dynamic irq creation and destruction */ |
6d50bc26 | 361 | extern unsigned int create_irq_nr(unsigned int irq_want); |
3a16d713 EB |
362 | extern int create_irq(void); |
363 | extern void destroy_irq(unsigned int irq); | |
364 | ||
1f80025e EB |
365 | /* Test to see if a driver has successfully requested an irq */ |
366 | static inline int irq_has_action(unsigned int irq) | |
367 | { | |
08678b08 | 368 | struct irq_desc *desc = irq_to_desc(irq); |
1f80025e EB |
369 | return desc->action != NULL; |
370 | } | |
371 | ||
3a16d713 EB |
372 | /* Dynamic irq helper functions */ |
373 | extern void dynamic_irq_init(unsigned int irq); | |
374 | extern void dynamic_irq_cleanup(unsigned int irq); | |
dd87eb3a | 375 | |
3a16d713 | 376 | /* Set/get chip/data for an IRQ: */ |
dd87eb3a TG |
377 | extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); |
378 | extern int set_irq_data(unsigned int irq, void *data); | |
379 | extern int set_irq_chip_data(unsigned int irq, void *data); | |
380 | extern int set_irq_type(unsigned int irq, unsigned int type); | |
5b912c10 | 381 | extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); |
dd87eb3a | 382 | |
08678b08 YL |
383 | #define get_irq_chip(irq) (irq_to_desc(irq)->chip) |
384 | #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data) | |
385 | #define get_irq_data(irq) (irq_to_desc(irq)->handler_data) | |
386 | #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc) | |
dd87eb3a | 387 | |
6a6de9ef | 388 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 389 | |
06fcb0c6 | 390 | #endif /* !CONFIG_S390 */ |
1da177e4 | 391 | |
06fcb0c6 | 392 | #endif /* _LINUX_IRQ_H */ |