include/asm-m68k/irq.h

   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__ int irq_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 extern void (*enable_irq)(unsigned int);
  71 extern void (*disable_irq)(unsigned int);
  72
  73 extern int sys_request_irq(unsigned int,
  74         void (*)(int, void *, struct pt_regs *),
  75         unsigned long, const char *, void *);
  76 extern void sys_free_irq(unsigned int, void *);
  77
  78 /*
  79  * various flags for request_irq()
  80  */
  81 #define IRQ_FLG_LOCK    (0x0001)        /* handler is not replaceable   */
  82 #define IRQ_FLG_REPLACE (0x0002)        /* replace existing handler     */
  83 #define IRQ_FLG_FAST    (0x0004)
  84 #define IRQ_FLG_SLOW    (0x0008)
  85 #define IRQ_FLG_STD     (0x8000)        /* internally used              */
  86
  87 /*
  88  * This structure is used to chain together the ISRs for a particular
  89  * interrupt source (if it supports chaining).
  90  */
  91 typedef struct irq_node {
  92         void            (*handler)(int, void *, struct pt_regs *);
  93         unsigned long   flags;
  94         void            *dev_id;
  95         const char      *devname;
  96         struct irq_node *next;
  97 } irq_node_t;
  98
  99 /*
 100  * This structure has only 4 elements for speed reasons
 101  */
 102 typedef struct irq_handler {
 103         void            (*handler)(int, void *, struct pt_regs *);
 104         unsigned long   flags;
 105         void            *dev_id;
 106         const char      *devname;
 107 } irq_handler_t;
 108
 109 /* count of spurious interrupts */
 110 extern volatile unsigned int num_spurious;
 111
 112 /*
 113  * This function returns a new irq_node_t
 114  */
 115 extern irq_node_t *new_irq_node(void);
 116
 117 #endif /* _M68K_IRQ_H_ */