4 #include <linux/hardirq.h>
5 #include <linux/spinlock_types.h>
8 * # of m68k auto vector interrupts
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 * The hardirq mask has to be large enough to have
27 * space for potentially all IRQ sources in the system
28 * nesting on a single CPU:
30 #if (1 << HARDIRQ_BITS) < NR_IRQS
31 # error HARDIRQ_BITS is too low!
35 * Interrupt source definitions
36 * General interrupt sources are the level 1-7.
37 * Adding an interrupt service routine for one of these sources
38 * results in the addition of that routine to a chain of routines.
39 * Each one is called in succession. Each individual interrupt
40 * service routine should determine if the device associated with
41 * that routine requires service.
44 #define IRQ_SPURIOUS 0
46 #define IRQ_AUTO_1 1 /* level 1 interrupt */
47 #define IRQ_AUTO_2 2 /* level 2 interrupt */
48 #define IRQ_AUTO_3 3 /* level 3 interrupt */
49 #define IRQ_AUTO_4 4 /* level 4 interrupt */
50 #define IRQ_AUTO_5 5 /* level 5 interrupt */
51 #define IRQ_AUTO_6 6 /* level 6 interrupt */
52 #define IRQ_AUTO_7 7 /* level 7 interrupt (non-maskable) */
56 static __inline__ int irq_canonicalize(int irq)
62 * Machine specific interrupt sources.
64 * Adding an interrupt service routine for a source with this bit
65 * set indicates a special machine specific interrupt source.
66 * The machine specific files define these sources.
68 * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
69 * introduce unnecessary overhead.
71 * All interrupt handling is actually machine specific so it is better
72 * to use function pointers, as used by the Sparc port, and select the
73 * interrupt handling functions when initializing the kernel. This way
74 * we save some unnecessary overhead at run-time.
78 extern void (*enable_irq)(unsigned int);
79 extern void (*disable_irq)(unsigned int);
80 #define disable_irq_nosync disable_irq
84 extern int cpu_request_irq(unsigned int,
85 int (*)(int, void *, struct pt_regs *),
86 unsigned long, const char *, void *);
87 extern void cpu_free_irq(unsigned int, void *);
90 * various flags for request_irq() - the Amiga now uses the standard
91 * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
94 #ifndef MACH_AMIGA_ONLY
95 #define IRQ_FLG_LOCK (0x0001) /* handler is not replaceable */
96 #define IRQ_FLG_REPLACE (0x0002) /* replace existing handler */
97 #define IRQ_FLG_FAST (0x0004)
98 #define IRQ_FLG_SLOW (0x0008)
99 #define IRQ_FLG_STD (0x8000) /* internally used */
103 * This structure is used to chain together the ISRs for a particular
104 * interrupt source (if it supports chaining).
106 typedef struct irq_node {
107 int (*handler)(int, void *, struct pt_regs *);
109 struct irq_node *next;
115 * This structure has only 4 elements for speed reasons
117 typedef struct irq_handler {
118 int (*handler)(int, void *, struct pt_regs *);
124 struct irq_controller {
127 int (*startup)(unsigned int irq);
128 void (*shutdown)(unsigned int irq);
129 void (*enable)(unsigned int irq);
130 void (*disable)(unsigned int irq);
133 extern int m68k_irq_startup(unsigned int);
134 extern void m68k_irq_shutdown(unsigned int);
136 /* count of spurious interrupts */
137 extern volatile unsigned int num_spurious;
140 * This function returns a new irq_node_t
142 extern irq_node_t *new_irq_node(void);
144 #endif /* _M68K_IRQ_H_ */