138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
#ifndef _M68K_IRQ_H_
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#define _M68K_IRQ_H_
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#include <linux/interrupt.h>
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/*
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* # of m68k interrupts
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*/
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#define SYS_IRQS 8
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/*
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* This should be the same as the max(NUM_X_SOURCES) for all the
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* different m68k hosts compiled into the kernel.
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* Currently the Atari has 72 and the Amiga 24, but if both are
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* supported in the kernel it is better to make room for 72.
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*/
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#if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
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#define NR_IRQS (72+SYS_IRQS)
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#else
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#define NR_IRQS (24+SYS_IRQS)
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#endif
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/*
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* The hardirq mask has to be large enough to have
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* space for potentially all IRQ sources in the system
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* nesting on a single CPU:
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*/
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#if (1 << HARDIRQ_BITS) < NR_IRQS
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# error HARDIRQ_BITS is too low!
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#endif
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/*
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* Interrupt source definitions
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* General interrupt sources are the level 1-7.
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* Adding an interrupt service routine for one of these sources
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* results in the addition of that routine to a chain of routines.
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* Each one is called in succession. Each individual interrupt
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* service routine should determine if the device associated with
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* that routine requires service.
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*/
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#define IRQ1 (1) /* level 1 interrupt */
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#define IRQ2 (2) /* level 2 interrupt */
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#define IRQ3 (3) /* level 3 interrupt */
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#define IRQ4 (4) /* level 4 interrupt */
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#define IRQ5 (5) /* level 5 interrupt */
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#define IRQ6 (6) /* level 6 interrupt */
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#define IRQ7 (7) /* level 7 interrupt (non-maskable) */
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/*
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* "Generic" interrupt sources
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*/
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#define IRQ_SCHED_TIMER (8) /* interrupt source for scheduling timer */
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static __inline__ int irq_canonicalize(int irq)
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{
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return irq;
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}
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/*
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* Machine specific interrupt sources.
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*
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* Adding an interrupt service routine for a source with this bit
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* set indicates a special machine specific interrupt source.
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* The machine specific files define these sources.
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*
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* The IRQ_MACHSPEC bit is now gone - the only thing it did was to
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* introduce unnecessary overhead.
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*
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* All interrupt handling is actually machine specific so it is better
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* to use function pointers, as used by the Sparc port, and select the
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* interrupt handling functions when initializing the kernel. This way
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* we save some unnecessary overhead at run-time.
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* 01/11/97 - Jes
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*/
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extern void (*enable_irq)(unsigned int);
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extern void (*disable_irq)(unsigned int);
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#define disable_irq_nosync disable_irq
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struct pt_regs;
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extern int cpu_request_irq(unsigned int,
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irqreturn_t (*)(int, void *, struct pt_regs *),
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unsigned long, const char *, void *);
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extern void cpu_free_irq(unsigned int, void *);
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/*
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* various flags for request_irq() - the Amiga now uses the standard
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* mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
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* are your friends.
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*/
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#ifndef MACH_AMIGA_ONLY
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#define IRQ_FLG_LOCK (0x0001) /* handler is not replaceable */
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#define IRQ_FLG_REPLACE (0x0002) /* replace existing handler */
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#define IRQ_FLG_FAST (0x0004)
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#define IRQ_FLG_SLOW (0x0008)
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#define IRQ_FLG_STD (0x8000) /* internally used */
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#endif
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/*
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* This structure is used to chain together the ISRs for a particular
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* interrupt source (if it supports chaining).
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*/
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typedef struct irq_node {
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irqreturn_t (*handler)(int, void *, struct pt_regs *);
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unsigned long flags;
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void *dev_id;
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const char *devname;
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struct irq_node *next;
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} irq_node_t;
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/*
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* This structure has only 4 elements for speed reasons
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*/
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typedef struct irq_handler {
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irqreturn_t (*handler)(int, void *, struct pt_regs *);
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unsigned long flags;
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void *dev_id;
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const char *devname;
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} irq_handler_t;
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/* count of spurious interrupts */
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extern volatile unsigned int num_spurious;
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/*
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* This function returns a new irq_node_t
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*/
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extern irq_node_t *new_irq_node(void);
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struct irqaction;
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struct pt_regs;
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int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
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#endif /* _M68K_IRQ_H_ */
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