include/asm-arm26/irqchip.h

   1 /*
   2  *  linux/include/asm-arm/mach/irq.h
   3  *
   4  *  Copyright (C) 1995-2000 Russell King.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #ifndef __ASM_ARM_MACH_IRQ_H
  11 #define __ASM_ARM_MACH_IRQ_H
  12
  13 struct irqdesc;
  14 struct pt_regs;
  15 struct seq_file;
  16
  17 typedef void (*irq_handler_t)(unsigned int, struct irqdesc *, struct pt_regs *);
  18 typedef void (*irq_control_t)(unsigned int);
  19
  20 struct irqchip {
  21         /*
  22          * Acknowledge the IRQ.
  23          * If this is a level-based IRQ, then it is expected to mask the IRQ
  24          * as well.
  25          */
  26         void (*ack)(unsigned int);
  27         /*
  28          * Mask the IRQ in hardware.
  29          */
  30         void (*mask)(unsigned int);
  31         /*
  32          * Unmask the IRQ in hardware.
  33          */
  34         void (*unmask)(unsigned int);
  35         /*
  36          * Re-run the IRQ
  37          */
  38         void (*rerun)(unsigned int);
  39         /*
  40          * Set the type of the IRQ.
  41          */
  42         int (*type)(unsigned int, unsigned int);
  43 };
  44
  45 struct irqdesc {
  46         irq_handler_t   handle;
  47         struct irqchip  *chip;
  48         struct irqaction *action;
  49
  50         unsigned int    enabled  : 1;           /* IRQ is currently enabled   */
  51         unsigned int    triggered: 1;           /* IRQ has occurred           */
  52         unsigned int    running  : 1;           /* IRQ is running             */
  53         unsigned int    pending  : 1;           /* IRQ is pending             */
  54         unsigned int    probing  : 1;           /* IRQ in use for a probe     */
  55         unsigned int    probe_ok : 1;           /* IRQ can be used for probe  */
  56         unsigned int    valid    : 1;           /* IRQ claimable              */
  57         unsigned int    noautoenable : 1;       /* don't automatically enable IRQ */
  58         unsigned int    unused   :23;
  59         unsigned int    depth;                  /* disable depth              */
  60
  61         /*
  62          * IRQ lock detection
  63          */
  64         unsigned int    lck_cnt;
  65         unsigned int    lck_pc;
  66         unsigned int    lck_jif;
  67 };
  68
  69 extern struct irqdesc irq_desc[];
  70
  71 /*
  72  * This is internal.  Do not use it.
  73  */
  74 extern void (*init_arch_irq)(void);
  75 extern void init_FIQ(void);
  76 extern int show_fiq_list(struct seq_file *, void *);
  77 void __set_irq_handler(unsigned int irq, irq_handler_t, int);
  78
  79 /*
  80  * External stuff.
  81  */
  82 #define set_irq_handler(irq,handler)            __set_irq_handler(irq,handler,0)
  83 #define set_irq_chained_handler(irq,handler)    __set_irq_handler(irq,handler,1)
  84
  85 void set_irq_chip(unsigned int irq, struct irqchip *);
  86 void set_irq_flags(unsigned int irq, unsigned int flags);
  87
  88 #define IRQF_VALID      (1 << 0)
  89 #define IRQF_PROBE      (1 << 1)
  90 #define IRQF_NOAUTOEN   (1 << 2)
  91
  92 /*
  93  * Built-in IRQ handlers.
  94  */
  95 void do_level_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
  96 void do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
  97 void do_simple_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
  98 void do_bad_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
  99 void dummy_mask_unmask_irq(unsigned int irq);
 100
 101 #endif