include/asm-m68k/irq.h

   1 #ifndef _M68K_IRQ_H_
   2 #define _M68K_IRQ_H_
   3
   4 #include <linux/interrupt.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) || defined(CONFIG_MAC)
  19 #define NR_IRQS (72+SYS_IRQS)
  20 #else
  21 #define NR_IRQS (24+SYS_IRQS)
  22 #endif
  23
  24 /*
  25  * The hardirq mask has to be large enough to have
  26  * space for potentially all IRQ sources in the system
  27  * nesting on a single CPU:
  28  */
  29 #if (1 << HARDIRQ_BITS) < NR_IRQS
  30 # error HARDIRQ_BITS is too low!
  31 #endif
  32
  33 /*
  34  * Interrupt source definitions
  35  * General interrupt sources are the level 1-7.
  36  * Adding an interrupt service routine for one of these sources
  37  * results in the addition of that routine to a chain of routines.
  38  * Each one is called in succession.  Each individual interrupt
  39  * service routine should determine if the device associated with
  40  * that routine requires service.
  41  */
  42
  43 #define IRQ1            (1)     /* level 1 interrupt */
  44 #define IRQ2            (2)     /* level 2 interrupt */
  45 #define IRQ3            (3)     /* level 3 interrupt */
  46 #define IRQ4            (4)     /* level 4 interrupt */
  47 #define IRQ5            (5)     /* level 5 interrupt */
  48 #define IRQ6            (6)     /* level 6 interrupt */
  49 #define IRQ7            (7)     /* level 7 interrupt (non-maskable) */
  50
  51 /*
  52  * "Generic" interrupt sources
  53  */
  54
  55 #define IRQ_SCHED_TIMER (8)    /* interrupt source for scheduling timer */
  56
  57 static __inline__ int irq_canonicalize(int irq)
  58 {
  59         return irq;
  60 }
  61
  62 /*
  63  * Machine specific interrupt sources.
  64  *
  65  * Adding an interrupt service routine for a source with this bit
  66  * set indicates a special machine specific interrupt source.
  67  * The machine specific files define these sources.
  68  *
  69  * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
  70  * introduce unnecessary overhead.
  71  *
  72  * All interrupt handling is actually machine specific so it is better
  73  * to use function pointers, as used by the Sparc port, and select the
  74  * interrupt handling functions when initializing the kernel. This way
  75  * we save some unnecessary overhead at run-time.
  76  *                                                      01/11/97 - Jes
  77  */
  78
  79 extern void (*enable_irq)(unsigned int);
  80 extern void (*disable_irq)(unsigned int);
  81 #define disable_irq_nosync      disable_irq
  82
  83 struct pt_regs;
  84
  85 extern int cpu_request_irq(unsigned int,
  86                            irqreturn_t (*)(int, void *, struct pt_regs *),
  87                            unsigned long, const char *, void *);
  88 extern void cpu_free_irq(unsigned int, void *);
  89
  90 /*
  91  * various flags for request_irq() - the Amiga now uses the standard
  92  * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
  93  * are your friends.
  94  */
  95 #ifndef MACH_AMIGA_ONLY
  96 #define IRQ_FLG_LOCK    (0x0001)        /* handler is not replaceable   */
  97 #define IRQ_FLG_REPLACE (0x0002)        /* replace existing handler     */
  98 #define IRQ_FLG_FAST    (0x0004)
  99 #define IRQ_FLG_SLOW    (0x0008)
 100 #define IRQ_FLG_STD     (0x8000)        /* internally used              */
 101 #endif
 102
 103 /*
 104  * This structure is used to chain together the ISRs for a particular
 105  * interrupt source (if it supports chaining).
 106  */
 107 typedef struct irq_node {
 108         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
 109         unsigned long   flags;
 110         void            *dev_id;
 111         const char      *devname;
 112         struct irq_node *next;
 113 } irq_node_t;
 114
 115 /*
 116  * This structure has only 4 elements for speed reasons
 117  */
 118 typedef struct irq_handler {
 119         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
 120         unsigned long   flags;
 121         void            *dev_id;
 122         const char      *devname;
 123 } irq_handler_t;
 124
 125 /* count of spurious interrupts */
 126 extern volatile unsigned int num_spurious;
 127
 128 /*
 129  * This function returns a new irq_node_t
 130  */
 131 extern irq_node_t *new_irq_node(void);
 132
 133 #endif /* _M68K_IRQ_H_ */