include/asm-m68k/irq.h

   1 #ifndef _M68K_IRQ_H_
   2 #define _M68K_IRQ_H_
   3
   4 #include <linux/linkage.h>
   5 #include <linux/hardirq.h>
   6 #include <linux/spinlock_types.h>
   7
   8 /*
   9  * This should be the same as the max(NUM_X_SOURCES) for all the
  10  * different m68k hosts compiled into the kernel.
  11  * Currently the Atari has 72 and the Amiga 24, but if both are
  12  * supported in the kernel it is better to make room for 72.
  13  */
  14 #if defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
  15 #define NR_IRQS 200
  16 #elif defined(CONFIG_ATARI) || defined(CONFIG_MAC)
  17 #define NR_IRQS 72
  18 #elif defined(CONFIG_Q40)
  19 #define NR_IRQS 43
  20 #elif defined(CONFIG_AMIGA)
  21 #define NR_IRQS 32
  22 #elif defined(CONFIG_APOLLO)
  23 #define NR_IRQS 24
  24 #elif defined(CONFIG_HP300)
  25 #define NR_IRQS 8
  26 #else
  27 #error unknown nr of irqs
  28 #endif
  29
  30 /*
  31  * The hardirq mask has to be large enough to have
  32  * space for potentially all IRQ sources in the system
  33  * nesting on a single CPU:
  34  */
  35 #if (1 << HARDIRQ_BITS) < NR_IRQS
  36 # error HARDIRQ_BITS is too low!
  37 #endif
  38
  39 /*
  40  * Interrupt source definitions
  41  * General interrupt sources are the level 1-7.
  42  * Adding an interrupt service routine for one of these sources
  43  * results in the addition of that routine to a chain of routines.
  44  * Each one is called in succession.  Each individual interrupt
  45  * service routine should determine if the device associated with
  46  * that routine requires service.
  47  */
  48
  49 #define IRQ_SPURIOUS    0
  50
  51 #define IRQ_AUTO_1      1       /* level 1 interrupt */
  52 #define IRQ_AUTO_2      2       /* level 2 interrupt */
  53 #define IRQ_AUTO_3      3       /* level 3 interrupt */
  54 #define IRQ_AUTO_4      4       /* level 4 interrupt */
  55 #define IRQ_AUTO_5      5       /* level 5 interrupt */
  56 #define IRQ_AUTO_6      6       /* level 6 interrupt */
  57 #define IRQ_AUTO_7      7       /* level 7 interrupt (non-maskable) */
  58
  59 #define IRQ_USER        8
  60
  61 extern unsigned int irq_canonicalize(unsigned int irq);
  62 extern void enable_irq(unsigned int);
  63 extern void disable_irq(unsigned int);
  64 #define disable_irq_nosync      disable_irq
  65
  66 struct pt_regs;
  67
  68 /*
  69  * various flags for request_irq() - the Amiga now uses the standard
  70  * mechanism like all other architectures - IRQF_DISABLED and
  71  * IRQF_SHARED are your friends.
  72  */
  73 #ifndef MACH_AMIGA_ONLY
  74 #define IRQ_FLG_LOCK    (0x0001)        /* handler is not replaceable   */
  75 #define IRQ_FLG_REPLACE (0x0002)        /* replace existing handler     */
  76 #define IRQ_FLG_FAST    (0x0004)
  77 #define IRQ_FLG_SLOW    (0x0008)
  78 #define IRQ_FLG_STD     (0x8000)        /* internally used              */
  79 #endif
  80
  81 /*
  82  * This structure is used to chain together the ISRs for a particular
  83  * interrupt source (if it supports chaining).
  84  */
  85 typedef struct irq_node {
  86         int             (*handler)(int, void *);
  87         void            *dev_id;
  88         struct irq_node *next;
  89         unsigned long   flags;
  90         const char      *devname;
  91 } irq_node_t;
  92
  93 /*
  94  * This structure has only 4 elements for speed reasons
  95  */
  96 struct irq_handler {
  97         int             (*handler)(int, void *);
  98         unsigned long   flags;
  99         void            *dev_id;
 100         const char      *devname;
 101 };
 102
 103 struct irq_controller {
 104         const char *name;
 105         spinlock_t lock;
 106         int (*startup)(unsigned int irq);
 107         void (*shutdown)(unsigned int irq);
 108         void (*enable)(unsigned int irq);
 109         void (*disable)(unsigned int irq);
 110 };
 111
 112 extern int m68k_irq_startup(unsigned int);
 113 extern void m68k_irq_shutdown(unsigned int);
 114
 115 /*
 116  * This function returns a new irq_node_t
 117  */
 118 extern irq_node_t *new_irq_node(void);
 119
 120 extern void m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *));
 121 extern void m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
 122                                       void (*handler)(unsigned int, struct pt_regs *));
 123 extern void m68k_setup_irq_controller(struct irq_controller *, unsigned int, unsigned int);
 124
 125 asmlinkage void m68k_handle_int(unsigned int);
 126 asmlinkage void __m68k_handle_int(unsigned int, struct pt_regs *);
 127
 128 #endif /* _M68K_IRQ_H_ */