irq.h

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#ifndef _M68K_IRQ_H_
#define _M68K_IRQ_H_

#include <linux/config.h>

/*
 * # of m68k interrupts
 */

#define SYS_IRQS 8

/*
 * This should be the same as the max(NUM_X_SOURCES) for all the
 * different m68k hosts compiled into the kernel.
 * Currently the Atari has 72 and the Amiga 24, but if both are
 * supported in the kernel it is better to make room for 72.
 */
#if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
#define NR_IRQS (72+SYS_IRQS)
#else
#define NR_IRQS (24+SYS_IRQS)
#endif

/*
 * Interrupt source definitions
 * General interrupt sources are the level 1-7.
 * Adding an interrupt service routine for one of these sources
 * results in the addition of that routine to a chain of routines.
 * Each one is called in succession.  Each individual interrupt
 * service routine should determine if the device associated with
 * that routine requires service.
 */

#define IRQ1		(1)	/* level 1 interrupt */
#define IRQ2		(2)	/* level 2 interrupt */
#define IRQ3		(3)	/* level 3 interrupt */
#define IRQ4		(4)	/* level 4 interrupt */
#define IRQ5		(5)	/* level 5 interrupt */
#define IRQ6		(6)	/* level 6 interrupt */
#define IRQ7		(7)	/* level 7 interrupt (non-maskable) */

/*
 * "Generic" interrupt sources
 */

#define IRQ_SCHED_TIMER	(8)    /* interrupt source for scheduling timer */

static __inline__ int irq_cannonicalize(int irq)
{
	return irq;
}

/*
 * Machine specific interrupt sources.
 *
 * Adding an interrupt service routine for a source with this bit
 * set indicates a special machine specific interrupt source.
 * The machine specific files define these sources.
 *
 * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
 * introduce unnecessary overhead.
 *
 * All interrupt handling is actually machine specific so it is better
 * to use function pointers, as used by the Sparc port, and select the
 * interrupt handling functions when initializing the kernel. This way
 * we save some unnecessary overhead at run-time. 
 *                                                      01/11/97 - Jes
 */

extern void (*enable_irq)(unsigned int);
extern void (*disable_irq)(unsigned int);

#define disable_irq_nosync	disable_irq
#define enable_irq_nosync	enable_irq

extern int sys_request_irq(unsigned int, 
	void (*)(int, void *, struct pt_regs *), 
	unsigned long, const char *, void *);
extern void sys_free_irq(unsigned int, void *);

/*
 * various flags for request_irq() - the Amiga now uses the standard
 * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
 * are your friends.
 */
#ifndef CONFIG_AMIGA
#define IRQ_FLG_LOCK	(0x0001)	/* handler is not replaceable	*/
#define IRQ_FLG_REPLACE	(0x0002)	/* replace existing handler	*/
#define IRQ_FLG_FAST	(0x0004)
#define IRQ_FLG_SLOW	(0x0008)
#define IRQ_FLG_STD	(0x8000)	/* internally used		*/
#endif

/*
 * This structure is used to chain together the ISRs for a particular
 * interrupt source (if it supports chaining).
 */
typedef struct irq_node {
	void		(*handler)(int, void *, struct pt_regs *);
	unsigned long	flags;
	void		*dev_id;
	const char	*devname;
	struct irq_node *next;
} irq_node_t;

/*
 * This structure has only 4 elements for speed reasons
 */
typedef struct irq_handler {
	void		(*handler)(int, void *, struct pt_regs *);
	unsigned long	flags;
	void		*dev_id;
	const char	*devname;
} irq_handler_t;

/* count of spurious interrupts */
extern volatile unsigned int num_spurious;

/*
 * This function returns a new irq_node_t
 */
extern irq_node_t *new_irq_node(void);

#endif /* _M68K_IRQ_H_ */