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>
21 #include <linux/irqnr.h>
22 #include <linux/errno.h>
25 #include <asm/ptrace.h>
26 #include <asm/irq_regs.h>
29 typedef void (*irq_flow_handler_t)(unsigned int irq,
30 struct irq_desc *desc);
36 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
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 */
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 */
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 */
65 #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
66 #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
67 #define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
69 #ifdef CONFIG_IRQ_PER_CPU
70 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
71 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
73 # define CHECK_IRQ_PER_CPU(var) 0
74 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
77 struct proc_dir_entry;
81 * struct irq_chip - hardware interrupt chip descriptor
83 * @name: name for /proc/interrupts
84 * @startup: start up the interrupt (defaults to ->enable if NULL)
85 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
86 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
87 * @disable: disable the interrupt (defaults to chip->mask if NULL)
88 * @ack: start of a new interrupt
89 * @mask: mask an interrupt source
90 * @mask_ack: ack and mask an interrupt source
91 * @unmask: unmask an interrupt source
92 * @eoi: end of interrupt - chip level
93 * @end: end of interrupt - flow level
94 * @set_affinity: set the CPU affinity on SMP machines
95 * @retrigger: resend an IRQ to the CPU
96 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
97 * @set_wake: enable/disable power-management wake-on of an IRQ
99 * @release: release function solely used by UML
100 * @typename: obsoleted by name, kept as migration helper
104 unsigned int (*startup)(unsigned int irq);
105 void (*shutdown)(unsigned int irq);
106 void (*enable)(unsigned int irq);
107 void (*disable)(unsigned int irq);
109 void (*ack)(unsigned int irq);
110 void (*mask)(unsigned int irq);
111 void (*mask_ack)(unsigned int irq);
112 void (*unmask)(unsigned int irq);
113 void (*eoi)(unsigned int irq);
115 void (*end)(unsigned int irq);
116 void (*set_affinity)(unsigned int irq, cpumask_t dest);
117 int (*retrigger)(unsigned int irq);
118 int (*set_type)(unsigned int irq, unsigned int flow_type);
119 int (*set_wake)(unsigned int irq, unsigned int on);
121 /* Currently used only by UML, might disappear one day.*/
122 #ifdef CONFIG_IRQ_RELEASE_METHOD
123 void (*release)(unsigned int irq, void *dev_id);
126 * For compatibility, ->typename is copied into ->name.
129 const char *typename;
133 * struct irq_desc - interrupt descriptor
134 * @irq: interrupt number for this descriptor
135 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
136 * @chip: low level interrupt hardware access
137 * @msi_desc: MSI descriptor
138 * @handler_data: per-IRQ data for the irq_chip methods
139 * @chip_data: platform-specific per-chip private data for the chip
140 * methods, to allow shared chip implementations
141 * @action: the irq action chain
142 * @status: status information
143 * @depth: disable-depth, for nested irq_disable() calls
144 * @wake_depth: enable depth, for multiple set_irq_wake() callers
145 * @irq_count: stats field to detect stalled irqs
146 * @irqs_unhandled: stats field for spurious unhandled interrupts
147 * @last_unhandled: aging timer for unhandled count
148 * @lock: locking for SMP
149 * @affinity: IRQ affinity on SMP
150 * @cpu: cpu index useful for balancing
151 * @pending_mask: pending rebalanced interrupts
152 * @dir: /proc/irq/ procfs entry
153 * @name: flow handler name for /proc/interrupts output
157 irq_flow_handler_t handle_irq;
158 struct irq_chip *chip;
159 struct msi_desc *msi_desc;
162 struct irqaction *action; /* IRQ action list */
163 unsigned int status; /* IRQ status */
165 unsigned int depth; /* nested irq disables */
166 unsigned int wake_depth; /* nested wake enables */
167 unsigned int irq_count; /* For detecting broken IRQs */
168 unsigned int irqs_unhandled;
169 unsigned long last_unhandled; /* Aging timer for unhandled count */
175 #ifdef CONFIG_GENERIC_PENDING_IRQ
176 cpumask_t pending_mask;
178 #ifdef CONFIG_PROC_FS
179 struct proc_dir_entry *dir;
182 } ____cacheline_internodealigned_in_smp;
185 extern struct irq_desc irq_desc[NR_IRQS];
187 static inline struct irq_desc *irq_to_desc(unsigned int irq)
189 return (irq < nr_irqs) ? irq_desc + irq : NULL;
193 * Migration helpers for obsolete names, they will go away:
195 #define hw_interrupt_type irq_chip
196 typedef struct irq_chip hw_irq_controller;
197 #define no_irq_type no_irq_chip
198 typedef struct irq_desc irq_desc_t;
201 * Pick up the arch-dependent methods:
203 #include <asm/hw_irq.h>
205 extern int setup_irq(unsigned int irq, struct irqaction *new);
207 #ifdef CONFIG_GENERIC_HARDIRQS
211 #ifdef CONFIG_GENERIC_PENDING_IRQ
213 void move_native_irq(int irq);
214 void move_masked_irq(int irq);
216 #else /* CONFIG_GENERIC_PENDING_IRQ */
218 static inline void move_irq(int irq)
222 static inline void move_native_irq(int irq)
226 static inline void move_masked_irq(int irq)
230 #endif /* CONFIG_GENERIC_PENDING_IRQ */
232 #else /* CONFIG_SMP */
234 #define move_native_irq(x)
235 #define move_masked_irq(x)
237 #endif /* CONFIG_SMP */
239 extern int no_irq_affinity;
241 static inline int irq_balancing_disabled(unsigned int irq)
243 struct irq_desc *desc;
245 desc = irq_to_desc(irq);
246 return desc->status & IRQ_NO_BALANCING_MASK;
249 /* Handle irq action chains: */
250 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
253 * Built-in IRQ handlers for various IRQ types,
254 * callable via desc->chip->handle_irq()
256 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
257 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
258 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
259 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
260 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
261 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
264 * Monolithic do_IRQ implementation.
266 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
267 extern unsigned int __do_IRQ(unsigned int irq);
271 * Architectures call this to let the generic IRQ layer
272 * handle an interrupt. If the descriptor is attached to an
273 * irqchip-style controller then we call the ->handle_irq() handler,
274 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
276 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
278 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
279 desc->handle_irq(irq, desc);
281 if (likely(desc->handle_irq))
282 desc->handle_irq(irq, desc);
288 static inline void generic_handle_irq(unsigned int irq)
290 generic_handle_irq_desc(irq, irq_to_desc(irq));
293 /* Handling of unhandled and spurious interrupts: */
294 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
297 /* Resending of interrupts :*/
298 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
300 /* Enable/disable irq debugging output: */
301 extern int noirqdebug_setup(char *str);
303 /* Checks whether the interrupt can be requested by request_irq(): */
304 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
306 /* Dummy irq-chip implementations: */
307 extern struct irq_chip no_irq_chip;
308 extern struct irq_chip dummy_irq_chip;
311 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
312 irq_flow_handler_t handle);
314 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
315 irq_flow_handler_t handle, const char *name);
318 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
321 /* caller has locked the irq_desc and both params are valid */
322 static inline void __set_irq_handler_unlocked(int irq,
323 irq_flow_handler_t handler)
325 struct irq_desc *desc;
327 desc = irq_to_desc(irq);
328 desc->handle_irq = handler;
332 * Set a highlevel flow handler for a given IRQ:
335 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
337 __set_irq_handler(irq, handle, 0, NULL);
341 * Set a highlevel chained flow handler for a given IRQ.
342 * (a chained handler is automatically enabled and set to
343 * IRQ_NOREQUEST and IRQ_NOPROBE)
346 set_irq_chained_handler(unsigned int irq,
347 irq_flow_handler_t handle)
349 __set_irq_handler(irq, handle, 1, NULL);
352 extern void set_irq_noprobe(unsigned int irq);
353 extern void set_irq_probe(unsigned int irq);
355 /* Handle dynamic irq creation and destruction */
356 extern unsigned int create_irq_nr(unsigned int irq_want);
357 extern int create_irq(void);
358 extern void destroy_irq(unsigned int irq);
360 /* Test to see if a driver has successfully requested an irq */
361 static inline int irq_has_action(unsigned int irq)
363 struct irq_desc *desc = irq_to_desc(irq);
364 return desc->action != NULL;
367 /* Dynamic irq helper functions */
368 extern void dynamic_irq_init(unsigned int irq);
369 extern void dynamic_irq_cleanup(unsigned int irq);
371 /* Set/get chip/data for an IRQ: */
372 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
373 extern int set_irq_data(unsigned int irq, void *data);
374 extern int set_irq_chip_data(unsigned int irq, void *data);
375 extern int set_irq_type(unsigned int irq, unsigned int type);
376 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
378 #define get_irq_chip(irq) (irq_to_desc(irq)->chip)
379 #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
380 #define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
381 #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
383 #endif /* CONFIG_GENERIC_HARDIRQS */
385 #endif /* !CONFIG_S390 */
387 #endif /* _LINUX_IRQ_H */