include/asm-m68knommu/irq.h

   1 #ifndef _M68K_IRQ_H_
   2 #define _M68K_IRQ_H_
   3
   4 #include <linux/config.h>
   5 #include <linux/interrupt.h>
   6 #include <asm/ptrace.h>
   7
   8 #ifdef CONFIG_COLDFIRE
   9 /*
  10  * On the ColdFire we keep track of all vectors. That way drivers
  11  * can register whatever vector number they wish, and we can deal
  12  * with it.
  13  */
  14 #define SYS_IRQS        256
  15 #define NR_IRQS         SYS_IRQS
  16
  17 #else
  18
  19 /*
  20  * # of m68k interrupts
  21  */
  22 #define SYS_IRQS 8
  23 #define NR_IRQS (24+SYS_IRQS)
  24
  25 #endif /* CONFIG_COLDFIRE */
  26
  27 /*
  28  * Interrupt source definitions
  29  * General interrupt sources are the level 1-7.
  30  * Adding an interrupt service routine for one of these sources
  31  * results in the addition of that routine to a chain of routines.
  32  * Each one is called in succession.  Each individual interrupt
  33  * service routine should determine if the device associated with
  34  * that routine requires service.
  35  */
  36
  37 #define IRQ1            (1)     /* level 1 interrupt */
  38 #define IRQ2            (2)     /* level 2 interrupt */
  39 #define IRQ3            (3)     /* level 3 interrupt */
  40 #define IRQ4            (4)     /* level 4 interrupt */
  41 #define IRQ5            (5)     /* level 5 interrupt */
  42 #define IRQ6            (6)     /* level 6 interrupt */
  43 #define IRQ7            (7)     /* level 7 interrupt (non-maskable) */
  44
  45 /*
  46  * Machine specific interrupt sources.
  47  *
  48  * Adding an interrupt service routine for a source with this bit
  49  * set indicates a special machine specific interrupt source.
  50  * The machine specific files define these sources.
  51  *
  52  * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
  53  * introduce unnecessary overhead.
  54  *
  55  * All interrupt handling is actually machine specific so it is better
  56  * to use function pointers, as used by the Sparc port, and select the
  57  * interrupt handling functions when initializing the kernel. This way
  58  * we save some unnecessary overhead at run-time.
  59  *                                                      01/11/97 - Jes
  60  */
  61
  62 extern void (*mach_enable_irq)(unsigned int);
  63 extern void (*mach_disable_irq)(unsigned int);
  64
  65 /*
  66  * various flags for request_irq() - the Amiga now uses the standard
  67  * mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
  68  * are your friends.
  69  */
  70 #define IRQ_FLG_LOCK    (0x0001)        /* handler is not replaceable   */
  71 #define IRQ_FLG_REPLACE (0x0002)        /* replace existing handler     */
  72 #define IRQ_FLG_FAST    (0x0004)
  73 #define IRQ_FLG_SLOW    (0x0008)
  74 #define IRQ_FLG_STD     (0x8000)        /* internally used              */
  75
  76 #ifdef CONFIG_M68360
  77
  78 #define CPM_INTERRUPT    IRQ4
  79
  80 /* see MC68360 User's Manual, p. 7-377  */
  81 #define CPM_VECTOR_BASE  0x04           /* 3 MSbits of CPM vector */
  82
  83 #endif /* CONFIG_M68360 */
  84
  85 /*
  86  * This structure is used to chain together the ISRs for a particular
  87  * interrupt source (if it supports chaining).
  88  */
  89 typedef struct irq_node {
  90         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
  91         unsigned long   flags;
  92         void            *dev_id;
  93         const char      *devname;
  94         struct irq_node *next;
  95 } irq_node_t;
  96
  97 /*
  98  * This structure has only 4 elements for speed reasons
  99  */
 100 typedef struct irq_handler {
 101         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
 102         unsigned long   flags;
 103         void            *dev_id;
 104         const char      *devname;
 105 } irq_handler_t;
 106
 107 /* count of spurious interrupts */
 108 extern volatile unsigned int num_spurious;
 109
 110 /*
 111  * This function returns a new irq_node_t
 112  */
 113 extern irq_node_t *new_irq_node(void);
 114
 115 /*
 116  * Some drivers want these entry points
 117  */
 118 #define enable_irq(x)   (mach_enable_irq  ? (*mach_enable_irq)(x)  : 0)
 119 #define disable_irq(x)  (mach_disable_irq ? (*mach_disable_irq)(x) : 0)
 120
 121 #define enable_irq_nosync(x)    enable_irq(x)
 122 #define disable_irq_nosync(x)   disable_irq(x)
 123
 124 struct irqaction;
 125 struct pt_regs;
 126 int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
 127
 128 #endif /* _M68K_IRQ_H_ */