release/src-rt-6.x.4708/linux/linux-2.6.36/arch/m68k/include/asm/irq.h

   1 #ifndef _M68K_IRQ_H_
   2 #define _M68K_IRQ_H_
   3
   4 /*
   5  * This should be the same as the max(NUM_X_SOURCES) for all the
   6  * different m68k hosts compiled into the kernel.
   7  * Currently the Atari has 72 and the Amiga 24, but if both are
   8  * supported in the kernel it is better to make room for 72.
   9  */
  10 #if defined(CONFIG_COLDFIRE)
  11 #define NR_IRQS 256
  12 #elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
  13 #define NR_IRQS 200
  14 #elif defined(CONFIG_ATARI) || defined(CONFIG_MAC)
  15 #define NR_IRQS 72
  16 #elif defined(CONFIG_Q40)
  17 #define NR_IRQS 43
  18 #elif defined(CONFIG_AMIGA) || !defined(CONFIG_MMU)
  19 #define NR_IRQS 32
  20 #elif defined(CONFIG_APOLLO)
  21 #define NR_IRQS 24
  22 #elif defined(CONFIG_HP300)
  23 #define NR_IRQS 8
  24 #else
  25 #define NR_IRQS 0
  26 #endif
  27
  28 #ifdef CONFIG_MMU
  29
  30 #include <linux/linkage.h>
  31 #include <linux/hardirq.h>
  32 #include <linux/irqreturn.h>
  33 #include <linux/spinlock_types.h>
  34
  35 /*
  36  * The hardirq mask has to be large enough to have
  37  * space for potentially all IRQ sources in the system
  38  * nesting on a single CPU:
  39  */
  40 #if (1 << HARDIRQ_BITS) < NR_IRQS
  41 # error HARDIRQ_BITS is too low!
  42 #endif
  43
  44 /*
  45  * Interrupt source definitions
  46  * General interrupt sources are the level 1-7.
  47  * Adding an interrupt service routine for one of these sources
  48  * results in the addition of that routine to a chain of routines.
  49  * Each one is called in succession.  Each individual interrupt
  50  * service routine should determine if the device associated with
  51  * that routine requires service.
  52  */
  53
  54 #define IRQ_SPURIOUS    0
  55
  56 #define IRQ_AUTO_1      1       /* level 1 interrupt */
  57 #define IRQ_AUTO_2      2       /* level 2 interrupt */
  58 #define IRQ_AUTO_3      3       /* level 3 interrupt */
  59 #define IRQ_AUTO_4      4       /* level 4 interrupt */
  60 #define IRQ_AUTO_5      5       /* level 5 interrupt */
  61 #define IRQ_AUTO_6      6       /* level 6 interrupt */
  62 #define IRQ_AUTO_7      7       /* level 7 interrupt (non-maskable) */
  63
  64 #define IRQ_USER        8
  65
  66 extern unsigned int irq_canonicalize(unsigned int irq);
  67
  68 struct pt_regs;
  69
  70 /*
  71  * various flags for request_irq() - the Amiga now uses the standard
  72  * mechanism like all other architectures - IRQF_DISABLED and
  73  * IRQF_SHARED are your friends.
  74  */
  75 #ifndef MACH_AMIGA_ONLY
  76 #define IRQ_FLG_LOCK    (0x0001)        /* handler is not replaceable   */
  77 #define IRQ_FLG_REPLACE (0x0002)        /* replace existing handler     */
  78 #define IRQ_FLG_FAST    (0x0004)
  79 #define IRQ_FLG_SLOW    (0x0008)
  80 #define IRQ_FLG_STD     (0x8000)        /* internally used              */
  81 #endif
  82
  83 /*
  84  * This structure is used to chain together the ISRs for a particular
  85  * interrupt source (if it supports chaining).
  86  */
  87 typedef struct irq_node {
  88         irqreturn_t     (*handler)(int, void *);
  89         void            *dev_id;
  90         struct irq_node *next;
  91         unsigned long   flags;
  92         const char      *devname;
  93 } irq_node_t;
  94
  95 /*
  96  * This structure has only 4 elements for speed reasons
  97  */
  98 struct irq_handler {
  99         int             (*handler)(int, void *);
 100         unsigned long   flags;
 101         void            *dev_id;
 102         const char      *devname;
 103 };
 104
 105 struct irq_controller {
 106         const char *name;
 107         spinlock_t lock;
 108         int (*startup)(unsigned int irq);
 109         void (*shutdown)(unsigned int irq);
 110         void (*enable)(unsigned int irq);
 111         void (*disable)(unsigned int irq);
 112 };
 113
 114 extern int m68k_irq_startup(unsigned int);
 115 extern void m68k_irq_shutdown(unsigned int);
 116
 117 /*
 118  * This function returns a new irq_node_t
 119  */
 120 extern irq_node_t *new_irq_node(void);
 121
 122 extern void m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *));
 123 extern void m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
 124                                       void (*handler)(unsigned int, struct pt_regs *));
 125 extern void m68k_setup_irq_controller(struct irq_controller *, unsigned int, unsigned int);
 126
 127 asmlinkage void m68k_handle_int(unsigned int);
 128 asmlinkage void __m68k_handle_int(unsigned int, struct pt_regs *);
 129
 130 #else
 131 #define irq_canonicalize(irq)  (irq)
 132 #endif /* CONFIG_MMU */
 133
 134 #endif /* _M68K_IRQ_H_ */