5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
12 #include <linux/smp.h>
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>
23 #include <asm/ptrace.h>
26 typedef void fastcall (*irq_flow_handler_t
)(unsigned int irq
,
27 struct irq_desc
*desc
,
28 struct pt_regs
*regs
);
34 * Bits 0-16 are reserved for the IRQF_* bits in linux/interrupt.h
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 */
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)
60 # define CHECK_IRQ_PER_CPU(var) 0
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 */
70 struct proc_dir_entry
;
73 * struct irq_chip - hardware interrupt chip descriptor
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
91 * @release: release function solely used by UML
92 * @typename: obsoleted by name, kept as migration helper
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
);
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
);
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
);
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
);
118 * For compatibility, ->typename is copied into ->name.
121 const char *typename
;
125 * struct irq_desc - interrupt descriptor
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
145 * Pad this out to 32 bytes for cache and indexing reasons.
148 irq_flow_handler_t handle_irq
;
149 struct irq_chip
*chip
;
152 struct irqaction
*action
; /* IRQ action list */
153 unsigned int status
; /* IRQ status */
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
;
164 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
165 cpumask_t pending_mask
;
167 #ifdef CONFIG_PROC_FS
168 struct proc_dir_entry
*dir
;
170 } ____cacheline_aligned
;
172 extern struct irq_desc irq_desc
[NR_IRQS
];
175 * Migration helpers for obsolete names, they will go away:
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
;
183 * Pick up the arch-dependent methods:
185 #include <asm/hw_irq.h>
187 extern int setup_irq(unsigned int irq
, struct irqaction
*new);
189 #ifdef CONFIG_GENERIC_HARDIRQS
191 #ifndef handle_dynamic_tick
192 # define handle_dynamic_tick(a) do { } while (0)
196 static inline void set_native_irq_info(int irq
, cpumask_t mask
)
198 irq_desc
[irq
].affinity
= mask
;
201 static inline void set_native_irq_info(int irq
, cpumask_t mask
)
208 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
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
);
214 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
216 static inline void move_irq(int irq
)
220 static inline void move_native_irq(int irq
)
224 static inline void move_masked_irq(int irq
)
228 static inline void set_pending_irq(unsigned int irq
, cpumask_t mask
)
232 #endif /* CONFIG_GENERIC_PENDING_IRQ */
234 #else /* CONFIG_SMP */
236 #define move_native_irq(x)
237 #define move_masked_irq(x)
239 #endif /* CONFIG_SMP */
241 #ifdef CONFIG_IRQBALANCE
242 extern void set_balance_irq_affinity(unsigned int irq
, cpumask_t mask
);
244 static inline void set_balance_irq_affinity(unsigned int irq
, cpumask_t mask
)
249 #ifdef CONFIG_AUTO_IRQ_AFFINITY
250 extern int select_smp_affinity(unsigned int irq
);
252 static inline int select_smp_affinity(unsigned int irq
)
258 extern int no_irq_affinity
;
260 /* Handle irq action chains: */
261 extern int handle_IRQ_event(unsigned int irq
, struct pt_regs
*regs
,
262 struct irqaction
*action
);
265 * Built-in IRQ handlers for various IRQ types,
266 * callable via desc->chip->handle_irq()
269 handle_level_irq(unsigned int irq
, struct irq_desc
*desc
, struct pt_regs
*regs
);
271 handle_fasteoi_irq(unsigned int irq
, struct irq_desc
*desc
,
272 struct pt_regs
*regs
);
274 handle_edge_irq(unsigned int irq
, struct irq_desc
*desc
, struct pt_regs
*regs
);
276 handle_simple_irq(unsigned int irq
, struct irq_desc
*desc
,
277 struct pt_regs
*regs
);
279 handle_percpu_irq(unsigned int irq
, struct irq_desc
*desc
,
280 struct pt_regs
*regs
);
282 handle_bad_irq(unsigned int irq
, struct irq_desc
*desc
, struct pt_regs
*regs
);
285 * Get a descriptive string for the highlevel handler, for
286 * /proc/interrupts output:
288 extern const char *handle_irq_name(irq_flow_handler_t handle
);
291 * Monolithic do_IRQ implementation.
292 * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
294 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
295 extern fastcall
unsigned int __do_IRQ(unsigned int irq
, struct pt_regs
*regs
);
299 * Architectures call this to let the generic IRQ layer
300 * handle an interrupt. If the descriptor is attached to an
301 * irqchip-style controller then we call the ->handle_irq() handler,
302 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
304 static inline void generic_handle_irq(unsigned int irq
, struct pt_regs
*regs
)
306 struct irq_desc
*desc
= irq_desc
+ irq
;
308 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
309 desc
->handle_irq(irq
, desc
, regs
);
311 if (likely(desc
->handle_irq
))
312 desc
->handle_irq(irq
, desc
, regs
);
318 /* Handling of unhandled and spurious interrupts: */
319 extern void note_interrupt(unsigned int irq
, struct irq_desc
*desc
,
320 int action_ret
, struct pt_regs
*regs
);
322 /* Resending of interrupts :*/
323 void check_irq_resend(struct irq_desc
*desc
, unsigned int irq
);
325 /* Initialize /proc/irq/ */
326 extern void init_irq_proc(void);
328 /* Enable/disable irq debugging output: */
329 extern int noirqdebug_setup(char *str
);
331 /* Checks whether the interrupt can be requested by request_irq(): */
332 extern int can_request_irq(unsigned int irq
, unsigned long irqflags
);
334 /* Dummy irq-chip implementations: */
335 extern struct irq_chip no_irq_chip
;
336 extern struct irq_chip dummy_irq_chip
;
339 set_irq_chip_and_handler(unsigned int irq
, struct irq_chip
*chip
,
340 irq_flow_handler_t handle
);
342 __set_irq_handler(unsigned int irq
, irq_flow_handler_t handle
, int is_chained
);
345 * Set a highlevel flow handler for a given IRQ:
348 set_irq_handler(unsigned int irq
, irq_flow_handler_t handle
)
350 __set_irq_handler(irq
, handle
, 0);
354 * Set a highlevel chained flow handler for a given IRQ.
355 * (a chained handler is automatically enabled and set to
356 * IRQ_NOREQUEST and IRQ_NOPROBE)
359 set_irq_chained_handler(unsigned int irq
,
360 irq_flow_handler_t handle
)
362 __set_irq_handler(irq
, handle
, 1);
365 /* Handle dynamic irq creation and destruction */
366 extern int create_irq(void);
367 extern void destroy_irq(unsigned int irq
);
369 /* Test to see if a driver has successfully requested an irq */
370 static inline int irq_has_action(unsigned int irq
)
372 struct irq_desc
*desc
= irq_desc
+ irq
;
373 return desc
->action
!= NULL
;
376 /* Dynamic irq helper functions */
377 extern void dynamic_irq_init(unsigned int irq
);
378 extern void dynamic_irq_cleanup(unsigned int irq
);
380 /* Set/get chip/data for an IRQ: */
381 extern int set_irq_chip(unsigned int irq
, struct irq_chip
*chip
);
382 extern int set_irq_data(unsigned int irq
, void *data
);
383 extern int set_irq_chip_data(unsigned int irq
, void *data
);
384 extern int set_irq_type(unsigned int irq
, unsigned int type
);
386 #define get_irq_chip(irq) (irq_desc[irq].chip)
387 #define get_irq_chip_data(irq) (irq_desc[irq].chip_data)
388 #define get_irq_data(irq) (irq_desc[irq].handler_data)
390 #endif /* CONFIG_GENERIC_HARDIRQS */
392 #endif /* !CONFIG_S390 */
394 #endif /* _LINUX_IRQ_H */