include/asm-m68k/irq.h

Name: Public Git Hosting - davej-history.git/blob - include/asm-m68k/irq.h
Rating: 4.9 (8583 reviews)
 1 #ifndef _M68K_IRQ_H_
 2 #define _M68K_IRQ_H_
 3
 4 #include <linux/config.h>
 5
 6 /*
 7  * # of m68k interrupts
 8  */
 9
 10 #define SYS_IRQS 8
 11
 12 /*
 13  * This should be the same as the max(NUM_X_SOURCES) for all the
 14  * different m68k hosts compiled into the kernel.
 15  * Currently the Atari has 72 and the Amiga 24, but if both are
 16  * supported in the kernel it is better to make room for 72.
 17  */
 18 #if defined(CONFIG_ATARI)
 19 #define NR_IRQS (72+SYS_IRQS)
 20 #else
 21 #define NR_IRQS (24+SYS_IRQS)
 22 #endif
 23
 24 /*
 25  * Interrupt source definitions
 26  * General interrupt sources are the level 1-7.
 27  * Adding an interrupt service routine for one of these sources
 28  * results in the addition of that routine to a chain of routines.
 29  * Each one is called in succession. Each individual interrupt
 30  * service routine should determine if the device associated with
 31  * that routine requires service.
 32  */
 33
 34 #define IRQ1 (1)/* level 1 interrupt */
 35 #define IRQ2 (2)/* level 2 interrupt */
 36 #define IRQ3 (3)/* level 3 interrupt */
 37 #define IRQ4 (4)/* level 4 interrupt */
 38 #define IRQ5 (5)/* level 5 interrupt */
 39 #define IRQ6 (6)/* level 6 interrupt */
 40 #define IRQ7 (7)/* level 7 interrupt (non-maskable) */
 41
 42 /*
 43  * "Generic" interrupt sources
 44  */
 45
 46 #define IRQ_SCHED_TIMER (8)/* interrupt source for scheduling timer */
 47
 48 static __inline__ intirq_cannonicalize(int irq)
 49 {
 50 return irq;
 51 }
 52
 53 /*
 54  * Machine specific interrupt sources.
 55  *
 56  * Adding an interrupt service routine for a source with this bit
 57  * set indicates a special machine specific interrupt source.
 58  * The machine specific files define these sources.
 59  *
 60  * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
 61  * introduce unnecessary overhead.
 62  *
 63  * All interrupt handling is actually machine specific so it is better
 64  * to use function pointers, as used by the Sparc port, and select the
 65  * interrupt handling functions when initializing the kernel. This way
 66  * we save some unnecessary overhead at run-time.
 67  * 01/11/97 - Jes
 68  */
 69
 70 externvoid(*enable_irq)(unsigned int);
 71 externvoid(*disable_irq)(unsigned int);
 72
 73 #define disable_irq_nosync disable_irq
 74 #define enable_irq_nosync enable_irq
 75
 76 externintsys_request_irq(unsigned int,
 77 void(*)(int,void*,struct pt_regs *),
 78 unsigned long,const char*,void*);
 79 externvoidsys_free_irq(unsigned int,void*);
 80
 81 /*
 82  * various flags for request_irq() - the Amiga now uses the standard
 83  * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
 84  * are your friends.
 85  */
 86 #ifndef CONFIG_AMIGA
 87 #define IRQ_FLG_LOCK (0x0001)/* handler is not replaceable */
 88 #define IRQ_FLG_REPLACE (0x0002)/* replace existing handler */
 89 #define IRQ_FLG_FAST (0x0004)
 90 #define IRQ_FLG_SLOW (0x0008)
 91 #define IRQ_FLG_STD (0x8000)/* internally used */
 92 #endif
 93
 94 /*
 95  * This structure is used to chain together the ISRs for a particular
 96  * interrupt source (if it supports chaining).
 97  */
 98 typedefstruct irq_node {
 99 void(*handler)(int,void*,struct pt_regs *);
 100 unsigned long flags;
 101 void*dev_id;
 102 const char*devname;
 103 struct irq_node *next;
 104 } irq_node_t;
 105
 106 /*
 107  * This structure has only 4 elements for speed reasons
 108  */
 109 typedefstruct irq_handler {
 110 void(*handler)(int,void*,struct pt_regs *);
 111 unsigned long flags;
 112 void*dev_id;
 113 const char*devname;
 114 } irq_handler_t;
 115
 116 /* count of spurious interrupts */
 117 extern volatileunsigned int num_spurious;
 118
 119 /*
 120  * This function returns a new irq_node_t
 121  */
 122 extern irq_node_t *new_irq_node(void);
 123
 124 #endif/* _M68K_IRQ_H_ */