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>
13 #include <linux/linkage.h>
14 #include <linux/cache.h>
15 #include <linux/spinlock.h>
16 #include <linux/cpumask.h>
17 #include <linux/gfp.h>
18 #include <linux/irqreturn.h>
19 #include <linux/irqnr.h>
20 #include <linux/errno.h>
21 #include <linux/topology.h>
22 #include <linux/wait.h>
25 #include <asm/ptrace.h>
26 #include <asm/irq_regs.h>
32 typedef void (*irq_flow_handler_t
)(unsigned int irq
,
33 struct irq_desc
*desc
);
34 typedef void (*irq_preflow_handler_t
)(struct irq_data
*data
);
39 * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
41 * IRQ_TYPE_NONE - default, unspecified type
42 * IRQ_TYPE_EDGE_RISING - rising edge triggered
43 * IRQ_TYPE_EDGE_FALLING - falling edge triggered
44 * IRQ_TYPE_EDGE_BOTH - rising and falling edge triggered
45 * IRQ_TYPE_LEVEL_HIGH - high level triggered
46 * IRQ_TYPE_LEVEL_LOW - low level triggered
47 * IRQ_TYPE_LEVEL_MASK - Mask to filter out the level bits
48 * IRQ_TYPE_SENSE_MASK - Mask for all the above bits
49 * IRQ_TYPE_DEFAULT - For use by some PICs to ask irq_set_type
50 * to setup the HW to a sane default (used
51 * by irqdomain map() callbacks to synchronize
52 * the HW state and SW flags for a newly
53 * allocated descriptor).
55 * IRQ_TYPE_PROBE - Special flag for probing in progress
57 * Bits which can be modified via irq_set/clear/modify_status_flags()
58 * IRQ_LEVEL - Interrupt is level type. Will be also
59 * updated in the code when the above trigger
60 * bits are modified via irq_set_irq_type()
61 * IRQ_PER_CPU - Mark an interrupt PER_CPU. Will protect
62 * it from affinity setting
63 * IRQ_NOPROBE - Interrupt cannot be probed by autoprobing
64 * IRQ_NOREQUEST - Interrupt cannot be requested via
66 * IRQ_NOTHREAD - Interrupt cannot be threaded
67 * IRQ_NOAUTOEN - Interrupt is not automatically enabled in
69 * IRQ_NO_BALANCING - Interrupt cannot be balanced (affinity set)
70 * IRQ_MOVE_PCNTXT - Interrupt can be migrated from process context
71 * IRQ_NESTED_TRHEAD - Interrupt nests into another thread
72 * IRQ_PER_CPU_DEVID - Dev_id is a per-cpu variable
75 IRQ_TYPE_NONE
= 0x00000000,
76 IRQ_TYPE_EDGE_RISING
= 0x00000001,
77 IRQ_TYPE_EDGE_FALLING
= 0x00000002,
78 IRQ_TYPE_EDGE_BOTH
= (IRQ_TYPE_EDGE_FALLING
| IRQ_TYPE_EDGE_RISING
),
79 IRQ_TYPE_LEVEL_HIGH
= 0x00000004,
80 IRQ_TYPE_LEVEL_LOW
= 0x00000008,
81 IRQ_TYPE_LEVEL_MASK
= (IRQ_TYPE_LEVEL_LOW
| IRQ_TYPE_LEVEL_HIGH
),
82 IRQ_TYPE_SENSE_MASK
= 0x0000000f,
83 IRQ_TYPE_DEFAULT
= IRQ_TYPE_SENSE_MASK
,
85 IRQ_TYPE_PROBE
= 0x00000010,
88 IRQ_PER_CPU
= (1 << 9),
89 IRQ_NOPROBE
= (1 << 10),
90 IRQ_NOREQUEST
= (1 << 11),
91 IRQ_NOAUTOEN
= (1 << 12),
92 IRQ_NO_BALANCING
= (1 << 13),
93 IRQ_MOVE_PCNTXT
= (1 << 14),
94 IRQ_NESTED_THREAD
= (1 << 15),
95 IRQ_NOTHREAD
= (1 << 16),
96 IRQ_PER_CPU_DEVID
= (1 << 17),
99 #define IRQF_MODIFY_MASK \
100 (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
101 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
102 IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID)
104 #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
107 * Return value for chip->irq_set_affinity()
109 * IRQ_SET_MASK_OK - OK, core updates irq_data.affinity
110 * IRQ_SET_MASK_NOCPY - OK, chip did update irq_data.affinity
114 IRQ_SET_MASK_OK_NOCOPY
,
121 * struct irq_data - per irq and irq chip data passed down to chip functions
122 * @irq: interrupt number
123 * @hwirq: hardware interrupt number, local to the interrupt domain
124 * @node: node index useful for balancing
125 * @state_use_accessors: status information for irq chip functions.
126 * Use accessor functions to deal with it
127 * @chip: low level interrupt hardware access
128 * @domain: Interrupt translation domain; responsible for mapping
129 * between hwirq number and linux irq number.
130 * @handler_data: per-IRQ data for the irq_chip methods
131 * @chip_data: platform-specific per-chip private data for the chip
132 * methods, to allow shared chip implementations
133 * @msi_desc: MSI descriptor
134 * @affinity: IRQ affinity on SMP
136 * The fields here need to overlay the ones in irq_desc until we
137 * cleaned up the direct references and switched everything over to
144 unsigned int state_use_accessors
;
145 struct irq_chip
*chip
;
146 struct irq_domain
*domain
;
149 struct msi_desc
*msi_desc
;
150 cpumask_var_t affinity
;
154 * Bit masks for irq_data.state
156 * IRQD_TRIGGER_MASK - Mask for the trigger type bits
157 * IRQD_SETAFFINITY_PENDING - Affinity setting is pending
158 * IRQD_NO_BALANCING - Balancing disabled for this IRQ
159 * IRQD_PER_CPU - Interrupt is per cpu
160 * IRQD_AFFINITY_SET - Interrupt affinity was set
161 * IRQD_LEVEL - Interrupt is level triggered
162 * IRQD_WAKEUP_STATE - Interrupt is configured for wakeup
164 * IRDQ_MOVE_PCNTXT - Interrupt can be moved in process
166 * IRQD_IRQ_DISABLED - Disabled state of the interrupt
167 * IRQD_IRQ_MASKED - Masked state of the interrupt
168 * IRQD_IRQ_INPROGRESS - In progress state of the interrupt
171 IRQD_TRIGGER_MASK
= 0xf,
172 IRQD_SETAFFINITY_PENDING
= (1 << 8),
173 IRQD_NO_BALANCING
= (1 << 10),
174 IRQD_PER_CPU
= (1 << 11),
175 IRQD_AFFINITY_SET
= (1 << 12),
176 IRQD_LEVEL
= (1 << 13),
177 IRQD_WAKEUP_STATE
= (1 << 14),
178 IRQD_MOVE_PCNTXT
= (1 << 15),
179 IRQD_IRQ_DISABLED
= (1 << 16),
180 IRQD_IRQ_MASKED
= (1 << 17),
181 IRQD_IRQ_INPROGRESS
= (1 << 18),
184 static inline bool irqd_is_setaffinity_pending(struct irq_data
*d
)
186 return d
->state_use_accessors
& IRQD_SETAFFINITY_PENDING
;
189 static inline bool irqd_is_per_cpu(struct irq_data
*d
)
191 return d
->state_use_accessors
& IRQD_PER_CPU
;
194 static inline bool irqd_can_balance(struct irq_data
*d
)
196 return !(d
->state_use_accessors
& (IRQD_PER_CPU
| IRQD_NO_BALANCING
));
199 static inline bool irqd_affinity_was_set(struct irq_data
*d
)
201 return d
->state_use_accessors
& IRQD_AFFINITY_SET
;
204 static inline void irqd_mark_affinity_was_set(struct irq_data
*d
)
206 d
->state_use_accessors
|= IRQD_AFFINITY_SET
;
209 static inline u32
irqd_get_trigger_type(struct irq_data
*d
)
211 return d
->state_use_accessors
& IRQD_TRIGGER_MASK
;
215 * Must only be called inside irq_chip.irq_set_type() functions.
217 static inline void irqd_set_trigger_type(struct irq_data
*d
, u32 type
)
219 d
->state_use_accessors
&= ~IRQD_TRIGGER_MASK
;
220 d
->state_use_accessors
|= type
& IRQD_TRIGGER_MASK
;
223 static inline bool irqd_is_level_type(struct irq_data
*d
)
225 return d
->state_use_accessors
& IRQD_LEVEL
;
228 static inline bool irqd_is_wakeup_set(struct irq_data
*d
)
230 return d
->state_use_accessors
& IRQD_WAKEUP_STATE
;
233 static inline bool irqd_can_move_in_process_context(struct irq_data
*d
)
235 return d
->state_use_accessors
& IRQD_MOVE_PCNTXT
;
238 static inline bool irqd_irq_disabled(struct irq_data
*d
)
240 return d
->state_use_accessors
& IRQD_IRQ_DISABLED
;
243 static inline bool irqd_irq_masked(struct irq_data
*d
)
245 return d
->state_use_accessors
& IRQD_IRQ_MASKED
;
248 static inline bool irqd_irq_inprogress(struct irq_data
*d
)
250 return d
->state_use_accessors
& IRQD_IRQ_INPROGRESS
;
254 * Functions for chained handlers which can be enabled/disabled by the
255 * standard disable_irq/enable_irq calls. Must be called with
256 * irq_desc->lock held.
258 static inline void irqd_set_chained_irq_inprogress(struct irq_data
*d
)
260 d
->state_use_accessors
|= IRQD_IRQ_INPROGRESS
;
263 static inline void irqd_clr_chained_irq_inprogress(struct irq_data
*d
)
265 d
->state_use_accessors
&= ~IRQD_IRQ_INPROGRESS
;
268 static inline irq_hw_number_t
irqd_to_hwirq(struct irq_data
*d
)
274 * struct irq_chip - hardware interrupt chip descriptor
276 * @name: name for /proc/interrupts
277 * @irq_startup: start up the interrupt (defaults to ->enable if NULL)
278 * @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
279 * @irq_enable: enable the interrupt (defaults to chip->unmask if NULL)
280 * @irq_disable: disable the interrupt
281 * @irq_ack: start of a new interrupt
282 * @irq_mask: mask an interrupt source
283 * @irq_mask_ack: ack and mask an interrupt source
284 * @irq_unmask: unmask an interrupt source
285 * @irq_eoi: end of interrupt
286 * @irq_set_affinity: set the CPU affinity on SMP machines
287 * @irq_retrigger: resend an IRQ to the CPU
288 * @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
289 * @irq_set_wake: enable/disable power-management wake-on of an IRQ
290 * @irq_bus_lock: function to lock access to slow bus (i2c) chips
291 * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
292 * @irq_cpu_online: configure an interrupt source for a secondary CPU
293 * @irq_cpu_offline: un-configure an interrupt source for a secondary CPU
294 * @irq_suspend: function called from core code on suspend once per chip
295 * @irq_resume: function called from core code on resume once per chip
296 * @irq_pm_shutdown: function called from core code on shutdown once per chip
297 * @irq_print_chip: optional to print special chip info in show_interrupts
298 * @flags: chip specific flags
302 unsigned int (*irq_startup
)(struct irq_data
*data
);
303 void (*irq_shutdown
)(struct irq_data
*data
);
304 void (*irq_enable
)(struct irq_data
*data
);
305 void (*irq_disable
)(struct irq_data
*data
);
307 void (*irq_ack
)(struct irq_data
*data
);
308 void (*irq_mask
)(struct irq_data
*data
);
309 void (*irq_mask_ack
)(struct irq_data
*data
);
310 void (*irq_unmask
)(struct irq_data
*data
);
311 void (*irq_eoi
)(struct irq_data
*data
);
313 int (*irq_set_affinity
)(struct irq_data
*data
, const struct cpumask
*dest
, bool force
);
314 int (*irq_retrigger
)(struct irq_data
*data
);
315 int (*irq_set_type
)(struct irq_data
*data
, unsigned int flow_type
);
316 int (*irq_set_wake
)(struct irq_data
*data
, unsigned int on
);
318 void (*irq_bus_lock
)(struct irq_data
*data
);
319 void (*irq_bus_sync_unlock
)(struct irq_data
*data
);
321 void (*irq_cpu_online
)(struct irq_data
*data
);
322 void (*irq_cpu_offline
)(struct irq_data
*data
);
324 void (*irq_suspend
)(struct irq_data
*data
);
325 void (*irq_resume
)(struct irq_data
*data
);
326 void (*irq_pm_shutdown
)(struct irq_data
*data
);
328 void (*irq_print_chip
)(struct irq_data
*data
, struct seq_file
*p
);
334 * irq_chip specific flags
336 * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type()
337 * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled
338 * IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path
339 * IRQCHIP_ONOFFLINE_ENABLED: Only call irq_on/off_line callbacks
341 * IRQCHIP_SKIP_SET_WAKE: Skip chip.irq_set_wake(), for this irq chip
344 IRQCHIP_SET_TYPE_MASKED
= (1 << 0),
345 IRQCHIP_EOI_IF_HANDLED
= (1 << 1),
346 IRQCHIP_MASK_ON_SUSPEND
= (1 << 2),
347 IRQCHIP_ONOFFLINE_ENABLED
= (1 << 3),
348 IRQCHIP_SKIP_SET_WAKE
= (1 << 4),
349 IRQCHIP_ONESHOT_SAFE
= (1 << 5),
352 /* This include will go away once we isolated irq_desc usage to core code */
353 #include <linux/irqdesc.h>
356 * Pick up the arch-dependent methods:
358 #include <asm/hw_irq.h>
360 #ifndef NR_IRQS_LEGACY
361 # define NR_IRQS_LEGACY 0
364 #ifndef ARCH_IRQ_INIT_FLAGS
365 # define ARCH_IRQ_INIT_FLAGS 0
368 #define IRQ_DEFAULT_INIT_FLAGS ARCH_IRQ_INIT_FLAGS
371 extern int setup_irq(unsigned int irq
, struct irqaction
*new);
372 extern void remove_irq(unsigned int irq
, struct irqaction
*act
);
373 extern int setup_percpu_irq(unsigned int irq
, struct irqaction
*new);
374 extern void remove_percpu_irq(unsigned int irq
, struct irqaction
*act
);
376 extern void irq_cpu_online(void);
377 extern void irq_cpu_offline(void);
378 extern int __irq_set_affinity_locked(struct irq_data
*data
, const struct cpumask
*cpumask
);
380 #ifdef CONFIG_GENERIC_HARDIRQS
382 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
383 void irq_move_irq(struct irq_data
*data
);
384 void irq_move_masked_irq(struct irq_data
*data
);
386 static inline void irq_move_irq(struct irq_data
*data
) { }
387 static inline void irq_move_masked_irq(struct irq_data
*data
) { }
390 extern int no_irq_affinity
;
392 #ifdef CONFIG_HARDIRQS_SW_RESEND
393 int irq_set_parent(int irq
, int parent_irq
);
395 static inline int irq_set_parent(int irq
, int parent_irq
)
402 * Built-in IRQ handlers for various IRQ types,
403 * callable via desc->handle_irq()
405 extern void handle_level_irq(unsigned int irq
, struct irq_desc
*desc
);
406 extern void handle_fasteoi_irq(unsigned int irq
, struct irq_desc
*desc
);
407 extern void handle_edge_irq(unsigned int irq
, struct irq_desc
*desc
);
408 extern void handle_edge_eoi_irq(unsigned int irq
, struct irq_desc
*desc
);
409 extern void handle_simple_irq(unsigned int irq
, struct irq_desc
*desc
);
410 extern void handle_percpu_irq(unsigned int irq
, struct irq_desc
*desc
);
411 extern void handle_percpu_devid_irq(unsigned int irq
, struct irq_desc
*desc
);
412 extern void handle_bad_irq(unsigned int irq
, struct irq_desc
*desc
);
413 extern void handle_nested_irq(unsigned int irq
);
415 /* Handling of unhandled and spurious interrupts: */
416 extern void note_interrupt(unsigned int irq
, struct irq_desc
*desc
,
417 irqreturn_t action_ret
);
420 /* Enable/disable irq debugging output: */
421 extern int noirqdebug_setup(char *str
);
423 /* Checks whether the interrupt can be requested by request_irq(): */
424 extern int can_request_irq(unsigned int irq
, unsigned long irqflags
);
426 /* Dummy irq-chip implementations: */
427 extern struct irq_chip no_irq_chip
;
428 extern struct irq_chip dummy_irq_chip
;
431 irq_set_chip_and_handler_name(unsigned int irq
, struct irq_chip
*chip
,
432 irq_flow_handler_t handle
, const char *name
);
434 static inline void irq_set_chip_and_handler(unsigned int irq
, struct irq_chip
*chip
,
435 irq_flow_handler_t handle
)
437 irq_set_chip_and_handler_name(irq
, chip
, handle
, NULL
);
440 extern int irq_set_percpu_devid(unsigned int irq
);
443 __irq_set_handler(unsigned int irq
, irq_flow_handler_t handle
, int is_chained
,
447 irq_set_handler(unsigned int irq
, irq_flow_handler_t handle
)
449 __irq_set_handler(irq
, handle
, 0, NULL
);
453 * Set a highlevel chained flow handler for a given IRQ.
454 * (a chained handler is automatically enabled and set to
455 * IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD)
458 irq_set_chained_handler(unsigned int irq
, irq_flow_handler_t handle
)
460 __irq_set_handler(irq
, handle
, 1, NULL
);
463 void irq_modify_status(unsigned int irq
, unsigned long clr
, unsigned long set
);
465 static inline void irq_set_status_flags(unsigned int irq
, unsigned long set
)
467 irq_modify_status(irq
, 0, set
);
470 static inline void irq_clear_status_flags(unsigned int irq
, unsigned long clr
)
472 irq_modify_status(irq
, clr
, 0);
475 static inline void irq_set_noprobe(unsigned int irq
)
477 irq_modify_status(irq
, 0, IRQ_NOPROBE
);
480 static inline void irq_set_probe(unsigned int irq
)
482 irq_modify_status(irq
, IRQ_NOPROBE
, 0);
485 static inline void irq_set_nothread(unsigned int irq
)
487 irq_modify_status(irq
, 0, IRQ_NOTHREAD
);
490 static inline void irq_set_thread(unsigned int irq
)
492 irq_modify_status(irq
, IRQ_NOTHREAD
, 0);
495 static inline void irq_set_nested_thread(unsigned int irq
, bool nest
)
498 irq_set_status_flags(irq
, IRQ_NESTED_THREAD
);
500 irq_clear_status_flags(irq
, IRQ_NESTED_THREAD
);
503 static inline void irq_set_percpu_devid_flags(unsigned int irq
)
505 irq_set_status_flags(irq
,
506 IRQ_NOAUTOEN
| IRQ_PER_CPU
| IRQ_NOTHREAD
|
507 IRQ_NOPROBE
| IRQ_PER_CPU_DEVID
);
510 /* Handle dynamic irq creation and destruction */
511 extern unsigned int create_irq_nr(unsigned int irq_want
, int node
);
512 extern unsigned int __create_irqs(unsigned int from
, unsigned int count
,
514 extern int create_irq(void);
515 extern void destroy_irq(unsigned int irq
);
516 extern void destroy_irqs(unsigned int irq
, unsigned int count
);
519 * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
520 * irq_free_desc instead.
522 extern void dynamic_irq_cleanup(unsigned int irq
);
523 static inline void dynamic_irq_init(unsigned int irq
)
525 dynamic_irq_cleanup(irq
);
528 /* Set/get chip/data for an IRQ: */
529 extern int irq_set_chip(unsigned int irq
, struct irq_chip
*chip
);
530 extern int irq_set_handler_data(unsigned int irq
, void *data
);
531 extern int irq_set_chip_data(unsigned int irq
, void *data
);
532 extern int irq_set_irq_type(unsigned int irq
, unsigned int type
);
533 extern int irq_set_msi_desc(unsigned int irq
, struct msi_desc
*entry
);
534 extern int irq_set_msi_desc_off(unsigned int irq_base
, unsigned int irq_offset
,
535 struct msi_desc
*entry
);
536 extern struct irq_data
*irq_get_irq_data(unsigned int irq
);
538 static inline struct irq_chip
*irq_get_chip(unsigned int irq
)
540 struct irq_data
*d
= irq_get_irq_data(irq
);
541 return d
? d
->chip
: NULL
;
544 static inline struct irq_chip
*irq_data_get_irq_chip(struct irq_data
*d
)
549 static inline void *irq_get_chip_data(unsigned int irq
)
551 struct irq_data
*d
= irq_get_irq_data(irq
);
552 return d
? d
->chip_data
: NULL
;
555 static inline void *irq_data_get_irq_chip_data(struct irq_data
*d
)
560 static inline void *irq_get_handler_data(unsigned int irq
)
562 struct irq_data
*d
= irq_get_irq_data(irq
);
563 return d
? d
->handler_data
: NULL
;
566 static inline void *irq_data_get_irq_handler_data(struct irq_data
*d
)
568 return d
->handler_data
;
571 static inline struct msi_desc
*irq_get_msi_desc(unsigned int irq
)
573 struct irq_data
*d
= irq_get_irq_data(irq
);
574 return d
? d
->msi_desc
: NULL
;
577 static inline struct msi_desc
*irq_data_get_msi(struct irq_data
*d
)
582 int __irq_alloc_descs(int irq
, unsigned int from
, unsigned int cnt
, int node
,
583 struct module
*owner
);
585 /* use macros to avoid needing export.h for THIS_MODULE */
586 #define irq_alloc_descs(irq, from, cnt, node) \
587 __irq_alloc_descs(irq, from, cnt, node, THIS_MODULE)
589 #define irq_alloc_desc(node) \
590 irq_alloc_descs(-1, 0, 1, node)
592 #define irq_alloc_desc_at(at, node) \
593 irq_alloc_descs(at, at, 1, node)
595 #define irq_alloc_desc_from(from, node) \
596 irq_alloc_descs(-1, from, 1, node)
598 #define irq_alloc_descs_from(from, cnt, node) \
599 irq_alloc_descs(-1, from, cnt, node)
601 void irq_free_descs(unsigned int irq
, unsigned int cnt
);
602 int irq_reserve_irqs(unsigned int from
, unsigned int cnt
);
604 static inline void irq_free_desc(unsigned int irq
)
606 irq_free_descs(irq
, 1);
609 static inline int irq_reserve_irq(unsigned int irq
)
611 return irq_reserve_irqs(irq
, 1);
614 #ifndef irq_reg_writel
615 # define irq_reg_writel(val, addr) writel(val, addr)
617 #ifndef irq_reg_readl
618 # define irq_reg_readl(addr) readl(addr)
622 * struct irq_chip_regs - register offsets for struct irq_gci
623 * @enable: Enable register offset to reg_base
624 * @disable: Disable register offset to reg_base
625 * @mask: Mask register offset to reg_base
626 * @ack: Ack register offset to reg_base
627 * @eoi: Eoi register offset to reg_base
628 * @type: Type configuration register offset to reg_base
629 * @polarity: Polarity configuration register offset to reg_base
631 struct irq_chip_regs
{
632 unsigned long enable
;
633 unsigned long disable
;
638 unsigned long polarity
;
642 * struct irq_chip_type - Generic interrupt chip instance for a flow type
643 * @chip: The real interrupt chip which provides the callbacks
644 * @regs: Register offsets for this chip
645 * @handler: Flow handler associated with this chip
646 * @type: Chip can handle these flow types
648 * A irq_generic_chip can have several instances of irq_chip_type when
649 * it requires different functions and register offsets for different
652 struct irq_chip_type
{
653 struct irq_chip chip
;
654 struct irq_chip_regs regs
;
655 irq_flow_handler_t handler
;
660 * struct irq_chip_generic - Generic irq chip data structure
661 * @lock: Lock to protect register and cache data access
662 * @reg_base: Register base address (virtual)
663 * @irq_base: Interrupt base nr for this chip
664 * @irq_cnt: Number of interrupts handled by this chip
665 * @mask_cache: Cached mask register
666 * @type_cache: Cached type register
667 * @polarity_cache: Cached polarity register
668 * @wake_enabled: Interrupt can wakeup from suspend
669 * @wake_active: Interrupt is marked as an wakeup from suspend source
670 * @num_ct: Number of available irq_chip_type instances (usually 1)
671 * @private: Private data for non generic chip callbacks
672 * @list: List head for keeping track of instances
673 * @chip_types: Array of interrupt irq_chip_types
675 * Note, that irq_chip_generic can have multiple irq_chip_type
676 * implementations which can be associated to a particular irq line of
677 * an irq_chip_generic instance. That allows to share and protect
678 * state in an irq_chip_generic instance when we need to implement
679 * different flow mechanisms (level/edge) for it.
681 struct irq_chip_generic
{
683 void __iomem
*reg_base
;
684 unsigned int irq_base
;
685 unsigned int irq_cnt
;
693 struct list_head list
;
694 struct irq_chip_type chip_types
[0];
698 * enum irq_gc_flags - Initialization flags for generic irq chips
699 * @IRQ_GC_INIT_MASK_CACHE: Initialize the mask_cache by reading mask reg
700 * @IRQ_GC_INIT_NESTED_LOCK: Set the lock class of the irqs to nested for
701 * irq chips which need to call irq_set_wake() on
702 * the parent irq. Usually GPIO implementations
705 IRQ_GC_INIT_MASK_CACHE
= 1 << 0,
706 IRQ_GC_INIT_NESTED_LOCK
= 1 << 1,
709 /* Generic chip callback functions */
710 void irq_gc_noop(struct irq_data
*d
);
711 void irq_gc_mask_disable_reg(struct irq_data
*d
);
712 void irq_gc_mask_set_bit(struct irq_data
*d
);
713 void irq_gc_mask_clr_bit(struct irq_data
*d
);
714 void irq_gc_unmask_enable_reg(struct irq_data
*d
);
715 void irq_gc_ack_set_bit(struct irq_data
*d
);
716 void irq_gc_ack_clr_bit(struct irq_data
*d
);
717 void irq_gc_mask_disable_reg_and_ack(struct irq_data
*d
);
718 void irq_gc_eoi(struct irq_data
*d
);
719 int irq_gc_set_wake(struct irq_data
*d
, unsigned int on
);
721 /* Setup functions for irq_chip_generic */
722 struct irq_chip_generic
*
723 irq_alloc_generic_chip(const char *name
, int nr_ct
, unsigned int irq_base
,
724 void __iomem
*reg_base
, irq_flow_handler_t handler
);
725 void irq_setup_generic_chip(struct irq_chip_generic
*gc
, u32 msk
,
726 enum irq_gc_flags flags
, unsigned int clr
,
728 int irq_setup_alt_chip(struct irq_data
*d
, unsigned int type
);
729 void irq_remove_generic_chip(struct irq_chip_generic
*gc
, u32 msk
,
730 unsigned int clr
, unsigned int set
);
732 static inline struct irq_chip_type
*irq_data_get_chip_type(struct irq_data
*d
)
734 return container_of(d
->chip
, struct irq_chip_type
, chip
);
737 #define IRQ_MSK(n) (u32)((n) < 32 ? ((1 << (n)) - 1) : UINT_MAX)
740 static inline void irq_gc_lock(struct irq_chip_generic
*gc
)
742 raw_spin_lock(&gc
->lock
);
745 static inline void irq_gc_unlock(struct irq_chip_generic
*gc
)
747 raw_spin_unlock(&gc
->lock
);
750 static inline void irq_gc_lock(struct irq_chip_generic
*gc
) { }
751 static inline void irq_gc_unlock(struct irq_chip_generic
*gc
) { }
754 #else /* !CONFIG_GENERIC_HARDIRQS */
756 extern struct msi_desc
*irq_get_msi_desc(unsigned int irq
);
757 extern int irq_set_msi_desc(unsigned int irq
, struct msi_desc
*entry
);
759 #endif /* CONFIG_GENERIC_HARDIRQS */
761 #endif /* _LINUX_IRQ_H */