LXR linux-bk/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
  49static __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
  71extern void (*enable_irq)(unsigned int);
  72extern void (*disable_irq)(unsigned int);
  73
  74#define disable_irq_nosync      disable_irq
  75#define enable_irq_nosync       enable_irq
  76
  77struct pt_regs;
  78
  79extern int cpu_request_irq(unsigned int,
  80                           irqreturn_t (*)(int, void *, struct pt_regs *),
  81                           unsigned long, const char *, void *);
  82extern 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 */
 101typedef 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 */
 112typedef 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 */
 120extern volatile unsigned int num_spurious;
 121
 122/*
 123 * This function returns a new irq_node_t
 124 */
 125extern irq_node_t *new_irq_node(void);
 126
 127struct irqaction;
 128struct pt_regs;
 129int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
 130
 131#endif /* _M68K_IRQ_H_ */
 132