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1da177e4 LT |
1 | #ifndef _M68K_IRQ_H_ |
2 | #define _M68K_IRQ_H_ | |
3 | ||
4 | #include <linux/config.h> | |
5 | #include <linux/interrupt.h> | |
6 | ||
7 | /* | |
8 | * # of m68k interrupts | |
9 | */ | |
10 | ||
11 | #define SYS_IRQS 8 | |
12 | ||
13 | /* | |
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. | |
18 | */ | |
19 | #if defined(CONFIG_ATARI) || defined(CONFIG_MAC) | |
20 | #define NR_IRQS (72+SYS_IRQS) | |
21 | #else | |
22 | #define NR_IRQS (24+SYS_IRQS) | |
23 | #endif | |
24 | ||
85b07cd1 AV |
25 | /* |
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: | |
29 | */ | |
30 | #if (1 << HARDIRQ_BITS) < NR_IRQS | |
31 | # error HARDIRQ_BITS is too low! | |
32 | #endif | |
33 | ||
1da177e4 LT |
34 | /* |
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. | |
42 | */ | |
43 | ||
44 | #define IRQ1 (1) /* level 1 interrupt */ | |
45 | #define IRQ2 (2) /* level 2 interrupt */ | |
46 | #define IRQ3 (3) /* level 3 interrupt */ | |
47 | #define IRQ4 (4) /* level 4 interrupt */ | |
48 | #define IRQ5 (5) /* level 5 interrupt */ | |
49 | #define IRQ6 (6) /* level 6 interrupt */ | |
50 | #define IRQ7 (7) /* level 7 interrupt (non-maskable) */ | |
51 | ||
52 | /* | |
53 | * "Generic" interrupt sources | |
54 | */ | |
55 | ||
56 | #define IRQ_SCHED_TIMER (8) /* interrupt source for scheduling timer */ | |
57 | ||
58 | static __inline__ int irq_canonicalize(int irq) | |
59 | { | |
60 | return irq; | |
61 | } | |
62 | ||
63 | /* | |
64 | * Machine specific interrupt sources. | |
65 | * | |
66 | * Adding an interrupt service routine for a source with this bit | |
67 | * set indicates a special machine specific interrupt source. | |
68 | * The machine specific files define these sources. | |
69 | * | |
70 | * The IRQ_MACHSPEC bit is now gone - the only thing it did was to | |
71 | * introduce unnecessary overhead. | |
72 | * | |
73 | * All interrupt handling is actually machine specific so it is better | |
74 | * to use function pointers, as used by the Sparc port, and select the | |
75 | * interrupt handling functions when initializing the kernel. This way | |
76 | * we save some unnecessary overhead at run-time. | |
77 | * 01/11/97 - Jes | |
78 | */ | |
79 | ||
80 | extern void (*enable_irq)(unsigned int); | |
81 | extern void (*disable_irq)(unsigned int); | |
00fc00df | 82 | #define disable_irq_nosync disable_irq |
1da177e4 LT |
83 | |
84 | struct pt_regs; | |
85 | ||
86 | extern int cpu_request_irq(unsigned int, | |
87 | irqreturn_t (*)(int, void *, struct pt_regs *), | |
88 | unsigned long, const char *, void *); | |
89 | extern void cpu_free_irq(unsigned int, void *); | |
90 | ||
91 | /* | |
92 | * various flags for request_irq() - the Amiga now uses the standard | |
93 | * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ | |
94 | * are your friends. | |
95 | */ | |
96 | #ifndef MACH_AMIGA_ONLY | |
97 | #define IRQ_FLG_LOCK (0x0001) /* handler is not replaceable */ | |
98 | #define IRQ_FLG_REPLACE (0x0002) /* replace existing handler */ | |
99 | #define IRQ_FLG_FAST (0x0004) | |
100 | #define IRQ_FLG_SLOW (0x0008) | |
101 | #define IRQ_FLG_STD (0x8000) /* internally used */ | |
102 | #endif | |
103 | ||
104 | /* | |
105 | * This structure is used to chain together the ISRs for a particular | |
106 | * interrupt source (if it supports chaining). | |
107 | */ | |
108 | typedef struct irq_node { | |
109 | irqreturn_t (*handler)(int, void *, struct pt_regs *); | |
110 | unsigned long flags; | |
111 | void *dev_id; | |
112 | const char *devname; | |
113 | struct irq_node *next; | |
114 | } irq_node_t; | |
115 | ||
116 | /* | |
117 | * This structure has only 4 elements for speed reasons | |
118 | */ | |
119 | typedef struct irq_handler { | |
120 | irqreturn_t (*handler)(int, void *, struct pt_regs *); | |
121 | unsigned long flags; | |
122 | void *dev_id; | |
123 | const char *devname; | |
124 | } irq_handler_t; | |
125 | ||
126 | /* count of spurious interrupts */ | |
127 | extern volatile unsigned int num_spurious; | |
128 | ||
129 | /* | |
130 | * This function returns a new irq_node_t | |
131 | */ | |
132 | extern irq_node_t *new_irq_node(void); | |
133 | ||
134 | struct irqaction; | |
135 | struct pt_regs; | |
136 | int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *); | |
137 | ||
138 | #endif /* _M68K_IRQ_H_ */ |