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  * The hardirq mask has to be large enough to have
  27  * space for potentially all IRQ sources in the system
  28  * nesting on a single CPU:
  29  */
  30 #if (1 << HARDIRQ_BITS) < NR_IRQS
  31 # error HARDIRQ_BITS is too low!
  32 #endif
  33
  34 /*
  35  * Interrupt source definitions
  36  * General interrupt sources are the level 1-7.
  37  * Adding an interrupt service routine for one of these sources
  38  * results in the addition of that routine to a chain of routines.
  39  * Each one is called in succession.  Each individual interrupt
  40  * service routine should determine if the device associated with
  41  * that routine requires service.
  42  */
  43
  44 #define IRQ1            (1)     /* level 1 interrupt */
  45 #define IRQ2            (2)     /* level 2 interrupt */
  46 #define IRQ3            (3)     /* level 3 interrupt */
  47 #define IRQ4            (4)     /* level 4 interrupt */
  48 #define IRQ5            (5)     /* level 5 interrupt */
  49 #define IRQ6            (6)     /* level 6 interrupt */
  50 #define IRQ7            (7)     /* level 7 interrupt (non-maskable) */
  51
  52 /*
  53  * "Generic" interrupt sources
  54  */
  55
  56 #define IRQ_SCHED_TIMER (8)    /* interrupt source for scheduling timer */
  57
  58 static __inline__ int irq_canonicalize(int irq)
  59 {
  60         return irq;
  61 }
  62
  63 /*
  64  * Machine specific interrupt sources.
  65  *
  66  * Adding an interrupt service routine for a source with this bit
  67  * set indicates a special machine specific interrupt source.
  68  * The machine specific files define these sources.
  69  *
  70  * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
  71  * introduce unnecessary overhead.
  72  *
  73  * All interrupt handling is actually machine specific so it is better
  74  * to use function pointers, as used by the Sparc port, and select the
  75  * interrupt handling functions when initializing the kernel. This way
  76  * we save some unnecessary overhead at run-time.
  77  *                                                      01/11/97 - Jes
  78  */
  79
  80 extern void (*enable_irq)(unsigned int);
  81 extern void (*disable_irq)(unsigned int);
  82 #define disable_irq_nosync      disable_irq
  83
  84 struct pt_regs;
  85
  86 extern int cpu_request_irq(unsigned int,
  87                            irqreturn_t (*)(int, void *, struct pt_regs *),
  88                            unsigned long, const char *, void *);
  89 extern void cpu_free_irq(unsigned int, void *);
  90
  91 /*
  92  * various flags for request_irq() - the Amiga now uses the standard
  93  * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
  94  * are your friends.
  95  */
  96 #ifndef MACH_AMIGA_ONLY
  97 #define IRQ_FLG_LOCK    (0x0001)        /* handler is not replaceable   */
  98 #define IRQ_FLG_REPLACE (0x0002)        /* replace existing handler     */
  99 #define IRQ_FLG_FAST    (0x0004)
 100 #define IRQ_FLG_SLOW    (0x0008)
 101 #define IRQ_FLG_STD     (0x8000)        /* internally used              */
 102 #endif
 103
 104 /*
 105  * This structure is used to chain together the ISRs for a particular
 106  * interrupt source (if it supports chaining).
 107  */
 108 typedef struct irq_node {
 109         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
 110         unsigned long   flags;
 111         void            *dev_id;
 112         const char      *devname;
 113         struct irq_node *next;
 114 } irq_node_t;
 115
 116 /*
 117  * This structure has only 4 elements for speed reasons
 118  */
 119 typedef struct irq_handler {
 120         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
 121         unsigned long   flags;
 122         void            *dev_id;
 123         const char      *devname;
 124 } irq_handler_t;
 125
 126 /* count of spurious interrupts */
 127 extern volatile unsigned int num_spurious;
 128
 129 /*
 130  * This function returns a new irq_node_t
 131  */
 132 extern irq_node_t *new_irq_node(void);
 133
 134 struct irqaction;
 135 struct pt_regs;
 136 int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
 137
 138 #endif /* _M68K_IRQ_H_ */