include/asm-m68k/irq.h

   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
  25 /*
  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.
  33  */
  34
  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) */
  42
  43 /*
  44  * "Generic" interrupt sources
  45  */
  46
  47 #define IRQ_SCHED_TIMER (8)    /* interrupt source for scheduling timer */
  48
  49 static __inline__ int irq_canonicalize(int irq)
  50 {
  51         return irq;
  52 }
  53
  54 /*
  55  * Machine specific interrupt sources.
  56  *
  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.
  60  *
  61  * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
  62  * introduce unnecessary overhead.
  63  *
  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.
  68  *                                                      01/11/97 - Jes
  69  */
  70
  71 extern void (*enable_irq)(unsigned int);
  72 extern void (*disable_irq)(unsigned int);
  73
  74 #define disable_irq_nosync      disable_irq
  75 #define enable_irq_nosync       enable_irq
  76
  77 struct pt_regs;
  78
  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 *);
  83
  84 /*
  85  * various flags for request_irq() - the Amiga now uses the standard
  86  * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
  87  * are your friends.
  88  */
  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              */
  95 #endif
  96
  97 /*
  98  * This structure is used to chain together the ISRs for a particular
  99  * interrupt source (if it supports chaining).
 100  */
 101 typedef struct irq_node {
 102         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
 103         unsigned long   flags;
 104         void            *dev_id;
 105         const char      *devname;
 106         struct irq_node *next;
 107 } irq_node_t;
 108
 109 /*
 110  * This structure has only 4 elements for speed reasons
 111  */
 112 typedef struct irq_handler {
 113         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
 114         unsigned long   flags;
 115         void            *dev_id;
 116         const char      *devname;
 117 } irq_handler_t;
 118
 119 /* count of spurious interrupts */
 120 extern volatile unsigned int num_spurious;
 121
 122 /*
 123  * This function returns a new irq_node_t
 124  */
 125 extern irq_node_t *new_irq_node(void);
 126
 127 struct irqaction;
 128 struct pt_regs;
 129 int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
 130
 131 #endif /* _M68K_IRQ_H_ */