[net-next-2.6.git] / include / linux / irq.h

#ifndef _LINUX_IRQ_H
#define _LINUX_IRQ_H

/*
 * Please do not include this file in generic code.  There is currently
 * no requirement for any architecture to implement anything held
 * within this file.
 *
 * Thanks. --rmk
 */

#include <linux/smp.h>

#ifndef CONFIG_S390

#include <linux/linkage.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>
#include <linux/gfp.h>
#include <linux/irqreturn.h>
#include <linux/irqnr.h>
#include <linux/errno.h>
#include <linux/topology.h>
#include <linux/wait.h>

#include <asm/irq.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>

struct irq_desc;
typedef	void (*irq_flow_handler_t)(unsigned int irq,
					    struct irq_desc *desc);


/*
 * IRQ line status.
 *
 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
 *
 * IRQ types
 */
#define IRQ_TYPE_NONE		0x00000000	/* Default, unspecified type */
#define IRQ_TYPE_EDGE_RISING	0x00000001	/* Edge rising type */
#define IRQ_TYPE_EDGE_FALLING	0x00000002	/* Edge falling type */
#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
#define IRQ_TYPE_LEVEL_HIGH	0x00000004	/* Level high type */
#define IRQ_TYPE_LEVEL_LOW	0x00000008	/* Level low type */
#define IRQ_TYPE_SENSE_MASK	0x0000000f	/* Mask of the above */
#define IRQ_TYPE_PROBE		0x00000010	/* Probing in progress */

/* Internal flags */
#define IRQ_INPROGRESS		0x00000100	/* IRQ handler active - do not enter! */
#define IRQ_DISABLED		0x00000200	/* IRQ disabled - do not enter! */
#define IRQ_PENDING		0x00000400	/* IRQ pending - replay on enable */
#define IRQ_REPLAY		0x00000800	/* IRQ has been replayed but not acked yet */
#define IRQ_AUTODETECT		0x00001000	/* IRQ is being autodetected */
#define IRQ_WAITING		0x00002000	/* IRQ not yet seen - for autodetection */
#define IRQ_LEVEL		0x00004000	/* IRQ level triggered */
#define IRQ_MASKED		0x00008000	/* IRQ masked - shouldn't be seen again */
#define IRQ_PER_CPU		0x00010000	/* IRQ is per CPU */
#define IRQ_NOPROBE		0x00020000	/* IRQ is not valid for probing */
#define IRQ_NOREQUEST		0x00040000	/* IRQ cannot be requested */
#define IRQ_NOAUTOEN		0x00080000	/* IRQ will not be enabled on request irq */
#define IRQ_WAKEUP		0x00100000	/* IRQ triggers system wakeup */
#define IRQ_MOVE_PENDING	0x00200000	/* need to re-target IRQ destination */
#define IRQ_NO_BALANCING	0x00400000	/* IRQ is excluded from balancing */
#define IRQ_SPURIOUS_DISABLED	0x00800000	/* IRQ was disabled by the spurious trap */
#define IRQ_MOVE_PCNTXT		0x01000000	/* IRQ migration from process context */
#define IRQ_AFFINITY_SET	0x02000000	/* IRQ affinity was set from userspace*/
#define IRQ_SUSPENDED		0x04000000	/* IRQ has gone through suspend sequence */
#define IRQ_ONESHOT		0x08000000	/* IRQ is not unmasked after hardirq */
#define IRQ_NESTED_THREAD	0x10000000	/* IRQ is nested into another, no own handler thread */

#define IRQF_MODIFY_MASK	\
	(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
	 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL)

#ifdef CONFIG_IRQ_PER_CPU
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
# define IRQ_NO_BALANCING_MASK	(IRQ_PER_CPU | IRQ_NO_BALANCING)
#else
# define CHECK_IRQ_PER_CPU(var) 0
# define IRQ_NO_BALANCING_MASK	IRQ_NO_BALANCING
#endif

struct msi_desc;
struct irq_2_iommu;

/**
 * struct irq_data - per irq and irq chip data passed down to chip functions
 * @irq:		interrupt number
 * @node:		node index useful for balancing
 * @chip:		low level interrupt hardware access
 * @handler_data:	per-IRQ data for the irq_chip methods
 * @chip_data:		platform-specific per-chip private data for the chip
 *			methods, to allow shared chip implementations
 * @msi_desc:		MSI descriptor
 * @affinity:		IRQ affinity on SMP
 * @irq_2_iommu:	iommu with this irq
 *
 * The fields here need to overlay the ones in irq_desc until we
 * cleaned up the direct references and switched everything over to
 * irq_data.
 */
struct irq_data {
	unsigned int		irq;
	unsigned int		node;
	struct irq_chip		*chip;
	void			*handler_data;
	void			*chip_data;
	struct msi_desc		*msi_desc;
#ifdef CONFIG_SMP
	cpumask_var_t		affinity;
#endif
#ifdef CONFIG_INTR_REMAP
	struct irq_2_iommu      *irq_2_iommu;
#endif
};

/**
 * struct irq_chip - hardware interrupt chip descriptor
 *
 * @name:		name for /proc/interrupts
 * @startup:		deprecated, replaced by irq_startup
 * @shutdown:		deprecated, replaced by irq_shutdown
 * @enable:		deprecated, replaced by irq_enable
 * @disable:		deprecated, replaced by irq_disable
 * @ack:		deprecated, replaced by irq_ack
 * @mask:		deprecated, replaced by irq_mask
 * @mask_ack:		deprecated, replaced by irq_mask_ack
 * @unmask:		deprecated, replaced by irq_unmask
 * @eoi:		deprecated, replaced by irq_eoi
 * @end:		deprecated, will go away with __do_IRQ()
 * @set_affinity:	deprecated, replaced by irq_set_affinity
 * @retrigger:		deprecated, replaced by irq_retrigger
 * @set_type:		deprecated, replaced by irq_set_type
 * @set_wake:		deprecated, replaced by irq_wake
 * @bus_lock:		deprecated, replaced by irq_bus_lock
 * @bus_sync_unlock:	deprecated, replaced by irq_bus_sync_unlock
 *
 * @irq_startup:	start up the interrupt (defaults to ->enable if NULL)
 * @irq_shutdown:	shut down the interrupt (defaults to ->disable if NULL)
 * @irq_enable:		enable the interrupt (defaults to chip->unmask if NULL)
 * @irq_disable:	disable the interrupt
 * @irq_ack:		start of a new interrupt
 * @irq_mask:		mask an interrupt source
 * @irq_mask_ack:	ack and mask an interrupt source
 * @irq_unmask:		unmask an interrupt source
 * @irq_eoi:		end of interrupt
 * @irq_set_affinity:	set the CPU affinity on SMP machines
 * @irq_retrigger:	resend an IRQ to the CPU
 * @irq_set_type:	set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 * @irq_set_wake:	enable/disable power-management wake-on of an IRQ
 * @irq_bus_lock:	function to lock access to slow bus (i2c) chips
 * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
 *
 * @release:		release function solely used by UML
 */
struct irq_chip {
	const char	*name;
#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
	unsigned int	(*startup)(unsigned int irq);
	void		(*shutdown)(unsigned int irq);
	void		(*enable)(unsigned int irq);
	void		(*disable)(unsigned int irq);

	void		(*ack)(unsigned int irq);
	void		(*mask)(unsigned int irq);
	void		(*mask_ack)(unsigned int irq);
	void		(*unmask)(unsigned int irq);
	void		(*eoi)(unsigned int irq);

	void		(*end)(unsigned int irq);
	int		(*set_affinity)(unsigned int irq,
					const struct cpumask *dest);
	int		(*retrigger)(unsigned int irq);
	int		(*set_type)(unsigned int irq, unsigned int flow_type);
	int		(*set_wake)(unsigned int irq, unsigned int on);

	void		(*bus_lock)(unsigned int irq);
	void		(*bus_sync_unlock)(unsigned int irq);
#endif
	unsigned int	(*irq_startup)(struct irq_data *data);
	void		(*irq_shutdown)(struct irq_data *data);
	void		(*irq_enable)(struct irq_data *data);
	void		(*irq_disable)(struct irq_data *data);

	void		(*irq_ack)(struct irq_data *data);
	void		(*irq_mask)(struct irq_data *data);
	void		(*irq_mask_ack)(struct irq_data *data);
	void		(*irq_unmask)(struct irq_data *data);
	void		(*irq_eoi)(struct irq_data *data);

	int		(*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
	int		(*irq_retrigger)(struct irq_data *data);
	int		(*irq_set_type)(struct irq_data *data, unsigned int flow_type);
	int		(*irq_set_wake)(struct irq_data *data, unsigned int on);

	void		(*irq_bus_lock)(struct irq_data *data);
	void		(*irq_bus_sync_unlock)(struct irq_data *data);

	/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
	void		(*release)(unsigned int irq, void *dev_id);
#endif
};

/* This include will go away once we isolated irq_desc usage to core code */
#include <linux/irqdesc.h>

/*
 * Pick up the arch-dependent methods:
 */
#include <asm/hw_irq.h>

#ifndef NR_IRQS_LEGACY
# define NR_IRQS_LEGACY 0
#endif

#ifndef ARCH_IRQ_INIT_FLAGS
# define ARCH_IRQ_INIT_FLAGS	0
#endif

#define IRQ_DEFAULT_INIT_FLAGS	(IRQ_DISABLED | ARCH_IRQ_INIT_FLAGS)

struct irqaction;
extern int setup_irq(unsigned int irq, struct irqaction *new);
extern void remove_irq(unsigned int irq, struct irqaction *act);

#ifdef CONFIG_GENERIC_HARDIRQS

#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
void move_native_irq(int irq);
void move_masked_irq(int irq);
#else
static inline void move_native_irq(int irq) { }
static inline void move_masked_irq(int irq) { }
#endif

extern int no_irq_affinity;

/* Handle irq action chains: */
extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);

/*
 * Built-in IRQ handlers for various IRQ types,
 * callable via desc->handle_irq()
 */
extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_nested_irq(unsigned int irq);

/* Handling of unhandled and spurious interrupts: */
extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
			   irqreturn_t action_ret);


/* Enable/disable irq debugging output: */
extern int noirqdebug_setup(char *str);

/* Checks whether the interrupt can be requested by request_irq(): */
extern int can_request_irq(unsigned int irq, unsigned long irqflags);

/* Dummy irq-chip implementations: */
extern struct irq_chip no_irq_chip;
extern struct irq_chip dummy_irq_chip;

extern void
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
			 irq_flow_handler_t handle);
extern void
set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
			      irq_flow_handler_t handle, const char *name);

extern void
__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
		  const char *name);

/*
 * Set a highlevel flow handler for a given IRQ:
 */
static inline void
set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
{
	__set_irq_handler(irq, handle, 0, NULL);
}

/*
 * Set a highlevel chained flow handler for a given IRQ.
 * (a chained handler is automatically enabled and set to
 *  IRQ_NOREQUEST and IRQ_NOPROBE)
 */
static inline void
set_irq_chained_handler(unsigned int irq,
			irq_flow_handler_t handle)
{
	__set_irq_handler(irq, handle, 1, NULL);
}

extern void set_irq_nested_thread(unsigned int irq, int nest);

void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);

static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
{
	irq_modify_status(irq, 0, set);
}

static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
{
	irq_modify_status(irq, clr, 0);
}

static inline void set_irq_noprobe(unsigned int irq)
{
	irq_modify_status(irq, 0, IRQ_NOPROBE);
}

static inline void set_irq_probe(unsigned int irq)
{
	irq_modify_status(irq, IRQ_NOPROBE, 0);
}

/* Handle dynamic irq creation and destruction */
extern unsigned int create_irq_nr(unsigned int irq_want, int node);
extern int create_irq(void);
extern void destroy_irq(unsigned int irq);

/* Dynamic irq helper functions */
extern void dynamic_irq_init(unsigned int irq);
void dynamic_irq_init_keep_chip_data(unsigned int irq);
extern void dynamic_irq_cleanup(unsigned int irq);
void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);

/* Set/get chip/data for an IRQ: */
extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
extern int set_irq_data(unsigned int irq, void *data);
extern int set_irq_chip_data(unsigned int irq, void *data);
extern int set_irq_type(unsigned int irq, unsigned int type);
extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
extern struct irq_data *irq_get_irq_data(unsigned int irq);

static inline struct irq_chip *get_irq_chip(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->chip : NULL;
}

static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
{
	return d->chip;
}

static inline void *get_irq_chip_data(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->chip_data : NULL;
}

static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
{
	return d->chip_data;
}

static inline void *get_irq_data(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->handler_data : NULL;
}

static inline void *irq_data_get_irq_data(struct irq_data *d)
{
	return d->handler_data;
}

static inline struct msi_desc *get_irq_msi(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->msi_desc : NULL;
}

static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
{
	return d->msi_desc;
}

#ifdef CONFIG_INTR_REMAP
static inline struct irq_2_iommu *get_irq_iommu(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->irq_2_iommu : NULL;
}

static inline struct irq_2_iommu *irq_data_get_iommu(struct irq_data *d)
{
	return d->irq_2_iommu;
}
#endif

int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
void irq_free_descs(unsigned int irq, unsigned int cnt);
int irq_reserve_irqs(unsigned int from, unsigned int cnt);

static inline int irq_alloc_desc(int node)
{
	return irq_alloc_descs(-1, 0, 1, node);
}

static inline int irq_alloc_desc_at(unsigned int at, int node)
{
	return irq_alloc_descs(at, at, 1, node);
}

static inline int irq_alloc_desc_from(unsigned int from, int node)
{
	return irq_alloc_descs(-1, from, 1, node);
}

static inline void irq_free_desc(unsigned int irq)
{
	irq_free_descs(irq, 1);
}

#endif /* CONFIG_GENERIC_HARDIRQS */

#endif /* !CONFIG_S390 */

#endif /* _LINUX_IRQ_H */
Commit	Line	Data
06fcb0c6 IM	1	#ifndef _LINUX_IRQ_H
06fcb0c6 IM	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>
503e5763	20	#include <linux/gfp.h>
908dcecd	21	#include <linux/irqreturn.h>
dd3a1db9	22	#include <linux/irqnr.h>
77904fd6	23	#include <linux/errno.h>
503e5763	24	#include <linux/topology.h>
3aa551c9	25	#include <linux/wait.h>
1da177e4 LT	26
	27	#include <asm/irq.h>
	28	#include <asm/ptrace.h>
7d12e780	29	#include <asm/irq_regs.h>
1da177e4	30
57a58a94	31	struct irq_desc;
ec701584	32	typedef void (*irq_flow_handler_t)(unsigned int irq,
7d12e780	33	struct irq_desc *desc);
57a58a94 DH	34
57a58a94 DH	35
1da177e4 LT	36	/*
1da177e4 LT	37	* IRQ line status.
6e213616	38	*
950f4427	39	* Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
6e213616 TG	40	*
6e213616 TG	41	* IRQ types
1da177e4	42	*/
6e213616 TG	43	#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
	44	#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
	45	#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
	46	#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING \| IRQ_TYPE_EDGE_RISING)
	47	#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
	48	#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
	49	#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
	50	#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
	51
	52	/* Internal flags */
950f4427 TG	53	#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
	54	#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
	55	#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
	56	#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
	57	#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
	58	#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
	59	#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
	60	#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
	61	#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
	62	#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
	63	#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
	64	#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
d7e25f33 IM	65	#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
	66	#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
	67	#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
1adb0850	68	#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
f6d87f4b TG	69	#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
f6d87f4b TG	70	#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
0a0c5168	71	#define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */
b25c340c	72	#define IRQ_ONESHOT 0x08000000 /* IRQ is not unmasked after hardirq */
399b5da2	73	#define IRQ_NESTED_THREAD 0x10000000 /* IRQ is nested into another, no own handler thread */
950f4427	74
44247184 TG	75	#define IRQF_MODIFY_MASK \
	76	(IRQ_TYPE_SENSE_MASK \| IRQ_NOPROBE \| IRQ_NOREQUEST \| \
	77	IRQ_NOAUTOEN \| IRQ_MOVE_PCNTXT \| IRQ_LEVEL)
	78
0d7012a9	79	#ifdef CONFIG_IRQ_PER_CPU
f26fdd59	80	# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
950f4427	81	# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU \| IRQ_NO_BALANCING)
f26fdd59 KW	82	#else
f26fdd59 KW	83	# define CHECK_IRQ_PER_CPU(var) 0
950f4427	84	# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
f26fdd59	85	#endif
1da177e4	86
5b912c10	87	struct msi_desc;
f303a6dd	88	struct irq_2_iommu;
6a6de9ef	89
ff7dcd44 TG	90	/**
	91	* struct irq_data - per irq and irq chip data passed down to chip functions
	92	* @irq: interrupt number
	93	* @node: node index useful for balancing
	94	* @chip: low level interrupt hardware access
	95	* @handler_data: per-IRQ data for the irq_chip methods
	96	* @chip_data: platform-specific per-chip private data for the chip
	97	* methods, to allow shared chip implementations
	98	* @msi_desc: MSI descriptor
	99	* @affinity: IRQ affinity on SMP
	100	* @irq_2_iommu: iommu with this irq
	101	*
	102	* The fields here need to overlay the ones in irq_desc until we
	103	* cleaned up the direct references and switched everything over to
	104	* irq_data.
	105	*/
	106	struct irq_data {
	107	unsigned int irq;
	108	unsigned int node;
	109	struct irq_chip *chip;
	110	void *handler_data;
	111	void *chip_data;
	112	struct msi_desc *msi_desc;
	113	#ifdef CONFIG_SMP
	114	cpumask_var_t affinity;
	115	#endif
	116	#ifdef CONFIG_INTR_REMAP
	117	struct irq_2_iommu *irq_2_iommu;
	118	#endif
	119	};
	120
8fee5c36	121	/**
6a6de9ef	122	* struct irq_chip - hardware interrupt chip descriptor
8fee5c36 IM	123	*
8fee5c36 IM	124	* @name: name for /proc/interrupts
f8822657 TG	125	* @startup: deprecated, replaced by irq_startup
	126	* @shutdown: deprecated, replaced by irq_shutdown
	127	* @enable: deprecated, replaced by irq_enable
	128	* @disable: deprecated, replaced by irq_disable
	129	* @ack: deprecated, replaced by irq_ack
	130	* @mask: deprecated, replaced by irq_mask
	131	* @mask_ack: deprecated, replaced by irq_mask_ack
	132	* @unmask: deprecated, replaced by irq_unmask
	133	* @eoi: deprecated, replaced by irq_eoi
	134	* @end: deprecated, will go away with __do_IRQ()
	135	* @set_affinity: deprecated, replaced by irq_set_affinity
	136	* @retrigger: deprecated, replaced by irq_retrigger
	137	* @set_type: deprecated, replaced by irq_set_type
	138	* @set_wake: deprecated, replaced by irq_wake
	139	* @bus_lock: deprecated, replaced by irq_bus_lock
	140	* @bus_sync_unlock: deprecated, replaced by irq_bus_sync_unlock
8fee5c36	141	*
f8822657 TG	142	* @irq_startup: start up the interrupt (defaults to ->enable if NULL)
	143	* @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
	144	* @irq_enable: enable the interrupt (defaults to chip->unmask if NULL)
	145	* @irq_disable: disable the interrupt
	146	* @irq_ack: start of a new interrupt
	147	* @irq_mask: mask an interrupt source
	148	* @irq_mask_ack: ack and mask an interrupt source
	149	* @irq_unmask: unmask an interrupt source
	150	* @irq_eoi: end of interrupt
	151	* @irq_set_affinity: set the CPU affinity on SMP machines
	152	* @irq_retrigger: resend an IRQ to the CPU
	153	* @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
	154	* @irq_set_wake: enable/disable power-management wake-on of an IRQ
	155	* @irq_bus_lock: function to lock access to slow bus (i2c) chips
	156	* @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
70aedd24	157	*
8fee5c36	158	* @release: release function solely used by UML
1da177e4	159	*/
6a6de9ef TG	160	struct irq_chip {
6a6de9ef TG	161	const char *name;
bd151412	162	#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
71d218b7 IM	163	unsigned int (*startup)(unsigned int irq);
	164	void (*shutdown)(unsigned int irq);
	165	void (*enable)(unsigned int irq);
	166	void (*disable)(unsigned int irq);
6a6de9ef	167
71d218b7	168	void (*ack)(unsigned int irq);
6a6de9ef TG	169	void (*mask)(unsigned int irq);
	170	void (*mask_ack)(unsigned int irq);
	171	void (*unmask)(unsigned int irq);
47c2a3aa	172	void (*eoi)(unsigned int irq);
6a6de9ef	173
71d218b7	174	void (*end)(unsigned int irq);
d5dedd45	175	int (*set_affinity)(unsigned int irq,
0de26520	176	const struct cpumask *dest);
c0ad90a3	177	int (*retrigger)(unsigned int irq);
6a6de9ef TG	178	int (*set_type)(unsigned int irq, unsigned int flow_type);
6a6de9ef TG	179	int (*set_wake)(unsigned int irq, unsigned int on);
c0ad90a3	180
70aedd24 TG	181	void (*bus_lock)(unsigned int irq);
70aedd24 TG	182	void (*bus_sync_unlock)(unsigned int irq);
bd151412	183	#endif
f8822657 TG	184	unsigned int (irq_startup)(struct irq_data data);
	185	void (irq_shutdown)(struct irq_data data);
	186	void (irq_enable)(struct irq_data data);
	187	void (irq_disable)(struct irq_data data);
	188
	189	void (irq_ack)(struct irq_data data);
	190	void (irq_mask)(struct irq_data data);
	191	void (irq_mask_ack)(struct irq_data data);
	192	void (irq_unmask)(struct irq_data data);
	193	void (irq_eoi)(struct irq_data data);
	194
	195	int (irq_set_affinity)(struct irq_data data, const struct cpumask *dest, bool force);
	196	int (irq_retrigger)(struct irq_data data);
	197	int (irq_set_type)(struct irq_data data, unsigned int flow_type);
	198	int (irq_set_wake)(struct irq_data data, unsigned int on);
	199
	200	void (irq_bus_lock)(struct irq_data data);
	201	void (irq_bus_sync_unlock)(struct irq_data data);
	202
b77d6adc PBG	203	/* Currently used only by UML, might disappear one day.*/
b77d6adc PBG	204	#ifdef CONFIG_IRQ_RELEASE_METHOD
71d218b7	205	void (release)(unsigned int irq, void dev_id);
b77d6adc	206	#endif
1da177e4 LT	207	};
1da177e4 LT	208
e144710b TG	209	/* This include will go away once we isolated irq_desc usage to core code */
e144710b TG	210	#include <linux/irqdesc.h>
0b8f1efa	211
34ffdb72 IM	212	/*
	213	* Pick up the arch-dependent methods:
	214	*/
	215	#include <asm/hw_irq.h>
1da177e4	216
b683de2b TG	217	#ifndef NR_IRQS_LEGACY
	218	# define NR_IRQS_LEGACY 0
	219	#endif
	220
1318a481 TG	221	#ifndef ARCH_IRQ_INIT_FLAGS
	222	# define ARCH_IRQ_INIT_FLAGS 0
	223	#endif
	224
	225	#define IRQ_DEFAULT_INIT_FLAGS (IRQ_DISABLED \| ARCH_IRQ_INIT_FLAGS)
	226
e144710b	227	struct irqaction;
06fcb0c6	228	extern int setup_irq(unsigned int irq, struct irqaction *new);
cbf94f06	229	extern void remove_irq(unsigned int irq, struct irqaction *act);
1da177e4 LT	230
1da177e4 LT	231	#ifdef CONFIG_GENERIC_HARDIRQS
06fcb0c6	232
3a3856d0	233	#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
c777ac55	234	void move_native_irq(int irq);
e7b946e9	235	void move_masked_irq(int irq);
e144710b TG	236	#else
	237	static inline void move_native_irq(int irq) { }
	238	static inline void move_masked_irq(int irq) { }
	239	#endif
54d5d424	240
1da177e4	241	extern int no_irq_affinity;
1da177e4	242
6a6de9ef	243	/* Handle irq action chains: */
bedd30d9	244	extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
6a6de9ef TG	245
	246	/*
	247	* Built-in IRQ handlers for various IRQ types,
bebd04cc	248	* callable via desc->handle_irq()
6a6de9ef	249	*/
ec701584 HH	250	extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
	251	extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
	252	extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
	253	extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
	254	extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
	255	extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
31b47cf7	256	extern void handle_nested_irq(unsigned int irq);
6a6de9ef	257
6a6de9ef	258	/* Handling of unhandled and spurious interrupts: */
34ffdb72	259	extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
bedd30d9	260	irqreturn_t action_ret);
1da177e4	261
a4633adc	262
6a6de9ef TG	263	/* Enable/disable irq debugging output: */
	264	extern int noirqdebug_setup(char *str);
	265
	266	/* Checks whether the interrupt can be requested by request_irq(): */
	267	extern int can_request_irq(unsigned int irq, unsigned long irqflags);
	268
f8b5473f	269	/* Dummy irq-chip implementations: */
6a6de9ef	270	extern struct irq_chip no_irq_chip;
f8b5473f	271	extern struct irq_chip dummy_irq_chip;
6a6de9ef	272
145fc655 IM	273	extern void
	274	set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
	275	irq_flow_handler_t handle);
6a6de9ef	276	extern void
a460e745 IM	277	set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
	278	irq_flow_handler_t handle, const char *name);
	279
6a6de9ef	280	extern void
a460e745 IM	281	__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
a460e745 IM	282	const char *name);
1da177e4	283
6a6de9ef TG	284	/*
	285	* Set a highlevel flow handler for a given IRQ:
	286	*/
	287	static inline void
57a58a94	288	set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
6a6de9ef	289	{
a460e745	290	__set_irq_handler(irq, handle, 0, NULL);
6a6de9ef TG	291	}
	292
	293	/*
	294	* Set a highlevel chained flow handler for a given IRQ.
	295	* (a chained handler is automatically enabled and set to
	296	* IRQ_NOREQUEST and IRQ_NOPROBE)
	297	*/
	298	static inline void
	299	set_irq_chained_handler(unsigned int irq,
57a58a94	300	irq_flow_handler_t handle)
6a6de9ef	301	{
a460e745	302	__set_irq_handler(irq, handle, 1, NULL);
6a6de9ef TG	303	}
6a6de9ef TG	304
399b5da2 TG	305	extern void set_irq_nested_thread(unsigned int irq, int nest);
399b5da2 TG	306
44247184 TG	307	void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
	308
	309	static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
	310	{
	311	irq_modify_status(irq, 0, set);
	312	}
	313
	314	static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
	315	{
	316	irq_modify_status(irq, clr, 0);
	317	}
	318
	319	static inline void set_irq_noprobe(unsigned int irq)
	320	{
	321	irq_modify_status(irq, 0, IRQ_NOPROBE);
	322	}
	323
	324	static inline void set_irq_probe(unsigned int irq)
	325	{
	326	irq_modify_status(irq, IRQ_NOPROBE, 0);
	327	}
46f4f8f6	328
3a16d713	329	/* Handle dynamic irq creation and destruction */
d047f53a	330	extern unsigned int create_irq_nr(unsigned int irq_want, int node);
3a16d713 EB	331	extern int create_irq(void);
	332	extern void destroy_irq(unsigned int irq);
	333
	334	/* Dynamic irq helper functions */
	335	extern void dynamic_irq_init(unsigned int irq);
ced5b697	336	void dynamic_irq_init_keep_chip_data(unsigned int irq);
3a16d713	337	extern void dynamic_irq_cleanup(unsigned int irq);
ced5b697	338	void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);
dd87eb3a	339
3a16d713	340	/* Set/get chip/data for an IRQ: */
dd87eb3a TG	341	extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
	342	extern int set_irq_data(unsigned int irq, void *data);
	343	extern int set_irq_chip_data(unsigned int irq, void *data);
	344	extern int set_irq_type(unsigned int irq, unsigned int type);
5b912c10	345	extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
f303a6dd	346	extern struct irq_data *irq_get_irq_data(unsigned int irq);
dd87eb3a	347
f303a6dd TG	348	static inline struct irq_chip *get_irq_chip(unsigned int irq)
	349	{
	350	struct irq_data *d = irq_get_irq_data(irq);
	351	return d ? d->chip : NULL;
	352	}
	353
	354	static inline struct irq_chip irq_data_get_irq_chip(struct irq_data d)
	355	{
	356	return d->chip;
	357	}
	358
	359	static inline void *get_irq_chip_data(unsigned int irq)
	360	{
	361	struct irq_data *d = irq_get_irq_data(irq);
	362	return d ? d->chip_data : NULL;
	363	}
	364
	365	static inline void irq_data_get_irq_chip_data(struct irq_data d)
	366	{
	367	return d->chip_data;
	368	}
	369
	370	static inline void *get_irq_data(unsigned int irq)
	371	{
	372	struct irq_data *d = irq_get_irq_data(irq);
	373	return d ? d->handler_data : NULL;
	374	}
	375
	376	static inline void irq_data_get_irq_data(struct irq_data d)
	377	{
	378	return d->handler_data;
	379	}
	380
	381	static inline struct msi_desc *get_irq_msi(unsigned int irq)
	382	{
	383	struct irq_data *d = irq_get_irq_data(irq);
	384	return d ? d->msi_desc : NULL;
	385	}
	386
	387	static inline struct msi_desc irq_data_get_msi(struct irq_data d)
	388	{
	389	return d->msi_desc;
	390	}
	391
	392	#ifdef CONFIG_INTR_REMAP
	393	static inline struct irq_2_iommu *get_irq_iommu(unsigned int irq)
	394	{
	395	struct irq_data *d = irq_get_irq_data(irq);
	396	return d ? d->irq_2_iommu : NULL;
	397	}
	398
	399	static inline struct irq_2_iommu irq_data_get_iommu(struct irq_data d)
	400	{
	401	return d->irq_2_iommu;
	402	}
	403	#endif
dd87eb3a	404
1f5a5b87 TG	405	int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
1f5a5b87 TG	406	void irq_free_descs(unsigned int irq, unsigned int cnt);
06f6c339	407	int irq_reserve_irqs(unsigned int from, unsigned int cnt);
1f5a5b87 TG	408
	409	static inline int irq_alloc_desc(int node)
	410	{
	411	return irq_alloc_descs(-1, 0, 1, node);
	412	}
	413
	414	static inline int irq_alloc_desc_at(unsigned int at, int node)
	415	{
	416	return irq_alloc_descs(at, at, 1, node);
	417	}
	418
	419	static inline int irq_alloc_desc_from(unsigned int from, int node)
	420	{
	421	return irq_alloc_descs(-1, from, 1, node);
	422	}
	423
	424	static inline void irq_free_desc(unsigned int irq)
	425	{
	426	irq_free_descs(irq, 1);
	427	}
	428
6a6de9ef	429	#endif /* CONFIG_GENERIC_HARDIRQS */
1da177e4	430
06fcb0c6	431	#endif /* !CONFIG_S390 */
1da177e4	432
06fcb0c6	433	#endif /* _LINUX_IRQ_H */