4 #include <linux/config.h>
5 #include <linux/interrupt.h>
14 * This should be the same as the max(NUM_X_SOURCES) for all the
15 * different m68k hosts compiled into the kernel.
16 * Currently the Atari has 72 and the Amiga 24, but if both are
17 * supported in the kernel it is better to make room for 72.
19 #if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
20 #define NR_IRQS (72+SYS_IRQS)
22 #define NR_IRQS (24+SYS_IRQS)
26 * Interrupt source definitions
27 * General interrupt sources are the level 1-7.
28 * Adding an interrupt service routine for one of these sources
29 * results in the addition of that routine to a chain of routines.
30 * Each one is called in succession. Each individual interrupt
31 * service routine should determine if the device associated with
32 * that routine requires service.
35 #define IRQ1 (1) /* level 1 interrupt */
36 #define IRQ2 (2) /* level 2 interrupt */
37 #define IRQ3 (3) /* level 3 interrupt */
38 #define IRQ4 (4) /* level 4 interrupt */
39 #define IRQ5 (5) /* level 5 interrupt */
40 #define IRQ6 (6) /* level 6 interrupt */
41 #define IRQ7 (7) /* level 7 interrupt (non-maskable) */
44 * "Generic" interrupt sources
47 #define IRQ_SCHED_TIMER (8) /* interrupt source for scheduling timer */
49 static __inline__ int irq_canonicalize(int irq)
55 * Machine specific interrupt sources.
57 * Adding an interrupt service routine for a source with this bit
58 * set indicates a special machine specific interrupt source.
59 * The machine specific files define these sources.
61 * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
62 * introduce unnecessary overhead.
64 * All interrupt handling is actually machine specific so it is better
65 * to use function pointers, as used by the Sparc port, and select the
66 * interrupt handling functions when initializing the kernel. This way
67 * we save some unnecessary overhead at run-time.
71 extern void (*enable_irq)(unsigned int);
72 extern void (*disable_irq)(unsigned int);
74 #define disable_irq_nosync disable_irq
75 #define enable_irq_nosync enable_irq
79 extern int cpu_request_irq(unsigned int,
80 irqreturn_t (*)(int, void *, struct pt_regs *),
81 unsigned long, const char *, void *);
82 extern void cpu_free_irq(unsigned int, void *);
85 * various flags for request_irq() - the Amiga now uses the standard
86 * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
89 #ifndef MACH_AMIGA_ONLY
90 #define IRQ_FLG_LOCK (0x0001) /* handler is not replaceable */
91 #define IRQ_FLG_REPLACE (0x0002) /* replace existing handler */
92 #define IRQ_FLG_FAST (0x0004)
93 #define IRQ_FLG_SLOW (0x0008)
94 #define IRQ_FLG_STD (0x8000) /* internally used */
98 * This structure is used to chain together the ISRs for a particular
99 * interrupt source (if it supports chaining).
101 typedef struct irq_node {
102 irqreturn_t (*handler)(int, void *, struct pt_regs *);
106 struct irq_node *next;
110 * This structure has only 4 elements for speed reasons
112 typedef struct irq_handler {
113 irqreturn_t (*handler)(int, void *, struct pt_regs *);
119 /* count of spurious interrupts */
120 extern volatile unsigned int num_spurious;
123 * This function returns a new irq_node_t
125 extern irq_node_t *new_irq_node(void);
129 int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
131 #endif /* _M68K_IRQ_H_ */