1#ifndef __irq_h
2#define __irq_h
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
12#include <linux/config.h>
13
14#if !defined(CONFIG_ARCH_S390)
15
16#include <linux/cache.h>
17#include <linux/spinlock.h>
18
19#include <asm/irq.h>
20#include <asm/ptrace.h>
21
22/*
23 * IRQ line status.
24 */
25#define IRQ_INPROGRESS	1	/* IRQ handler active - do not enter! */
26#define IRQ_DISABLED	2	/* IRQ disabled - do not enter! */
27#define IRQ_PENDING	4	/* IRQ pending - replay on enable */
28#define IRQ_REPLAY	8	/* IRQ has been replayed but not acked yet */
29#define IRQ_AUTODETECT	16	/* IRQ is being autodetected */
30#define IRQ_WAITING	32	/* IRQ not yet seen - for autodetection */
31#define IRQ_LEVEL	64	/* IRQ level triggered */
32#define IRQ_MASKED	128	/* IRQ masked - shouldn't be seen again */
33#define IRQ_PER_CPU	256	/* IRQ is per CPU */
34
35/*
36 * Interrupt controller descriptor. This is all we need
37 * to describe about the low-level hardware.
38 */
39struct hw_interrupt_type {
40	const char * typename;
41	unsigned int (*startup)(unsigned int irq);
42	void (*shutdown)(unsigned int irq);
43	void (*enable)(unsigned int irq);
44	void (*disable)(unsigned int irq);
45	void (*ack)(unsigned int irq);
46	void (*end)(unsigned int irq);
47	void (*set_affinity)(unsigned int irq, unsigned long mask);
48};
49
50typedef struct hw_interrupt_type  hw_irq_controller;
51
52/*
53 * This is the "IRQ descriptor", which contains various information
54 * about the irq, including what kind of hardware handling it has,
55 * whether it is disabled etc etc.
56 *
57 * Pad this out to 32 bytes for cache and indexing reasons.
58 */
59typedef struct {
60	unsigned int status;		/* IRQ status */
61	hw_irq_controller *handler;
62	struct irqaction *action;	/* IRQ action list */
63	unsigned int depth;		/* nested irq disables */
64	spinlock_t lock;
65} ____cacheline_aligned irq_desc_t;
66
67extern irq_desc_t irq_desc [NR_IRQS];
68
69#include <asm/hw_irq.h> /* the arch dependent stuff */
70
71extern int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
72extern int setup_irq(unsigned int , struct irqaction * );
73
74extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
75extern void no_action(int cpl, void *dev_id, struct pt_regs *regs);
76
77#endif
78
79#endif /* __irq_h */
80