1#ifndef _M68K_IRQ_H_
2#define _M68K_IRQ_H_
3
4#include <linux/config.h>
5
6/*
7 * # of m68k interrupts
8 */
9
10#define SYS_IRQS 8
11
12/*
13 * This should be the same as the max(NUM_X_SOURCES) for all the
14 * different m68k hosts compiled into the kernel.
15 * Currently the Atari has 72 and the Amiga 24, but if both are
16 * supported in the kernel it is better to make room for 72.
17 */
18#if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
19#define NR_IRQS (72+SYS_IRQS)
20#else
21#define NR_IRQS (24+SYS_IRQS)
22#endif
23
24/*
25 * Interrupt source definitions
26 * General interrupt sources are the level 1-7.
27 * Adding an interrupt service routine for one of these sources
28 * results in the addition of that routine to a chain of routines.
29 * Each one is called in succession.  Each individual interrupt
30 * service routine should determine if the device associated with
31 * that routine requires service.
32 */
33
34#define IRQ1		(1)	/* level 1 interrupt */
35#define IRQ2		(2)	/* level 2 interrupt */
36#define IRQ3		(3)	/* level 3 interrupt */
37#define IRQ4		(4)	/* level 4 interrupt */
38#define IRQ5		(5)	/* level 5 interrupt */
39#define IRQ6		(6)	/* level 6 interrupt */
40#define IRQ7		(7)	/* level 7 interrupt (non-maskable) */
41
42/*
43 * "Generic" interrupt sources
44 */
45
46#define IRQ_SCHED_TIMER	(8)    /* interrupt source for scheduling timer */
47
48static __inline__ int irq_cannonicalize(int irq)
49{
50	return irq;
51}
52
53/*
54 * Machine specific interrupt sources.
55 *
56 * Adding an interrupt service routine for a source with this bit
57 * set indicates a special machine specific interrupt source.
58 * The machine specific files define these sources.
59 *
60 * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
61 * introduce unnecessary overhead.
62 *
63 * All interrupt handling is actually machine specific so it is better
64 * to use function pointers, as used by the Sparc port, and select the
65 * interrupt handling functions when initializing the kernel. This way
66 * we save some unnecessary overhead at run-time.
67 *                                                      01/11/97 - Jes
68 */
69
70extern void (*enable_irq)(unsigned int);
71extern void (*disable_irq)(unsigned int);
72
73#define disable_irq_nosync	disable_irq
74#define enable_irq_nosync	enable_irq
75
76extern int sys_request_irq(unsigned int,
77	void (*)(int, void *, struct pt_regs *),
78	unsigned long, const char *, void *);
79extern void sys_free_irq(unsigned int, void *);
80
81/*
82 * various flags for request_irq() - the Amiga now uses the standard
83 * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
84 * are your friends.
85 */
86#ifndef MACH_AMIGA_ONLY
87#define IRQ_FLG_LOCK	(0x0001)	/* handler is not replaceable	*/
88#define IRQ_FLG_REPLACE	(0x0002)	/* replace existing handler	*/
89#define IRQ_FLG_FAST	(0x0004)
90#define IRQ_FLG_SLOW	(0x0008)
91#define IRQ_FLG_STD	(0x8000)	/* internally used		*/
92#endif
93
94/*
95 * This structure is used to chain together the ISRs for a particular
96 * interrupt source (if it supports chaining).
97 */
98typedef struct irq_node {
99	void		(*handler)(int, void *, struct pt_regs *);
100	unsigned long	flags;
101	void		*dev_id;
102	const char	*devname;
103	struct irq_node *next;
104} irq_node_t;
105
106/*
107 * This structure has only 4 elements for speed reasons
108 */
109typedef struct irq_handler {
110	void		(*handler)(int, void *, struct pt_regs *);
111	unsigned long	flags;
112	void		*dev_id;
113	const char	*devname;
114} irq_handler_t;
115
116/* count of spurious interrupts */
117extern volatile unsigned int num_spurious;
118
119/*
120 * This function returns a new irq_node_t
121 */
122extern irq_node_t *new_irq_node(void);
123
124#endif /* _M68K_IRQ_H_ */
125