LXR linux/include/asm-arm/mach/irq.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
  13struct irqdesc;
  14struct pt_regs;
  15struct seq_file;
  16
  17typedef void (*irq_handler_t)(unsigned int, struct irqdesc *, struct pt_regs *);
  18typedef void (*irq_control_t)(unsigned int);
  19
  20struct 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         * Ask the hardware to re-trigger the IRQ.
  37         * Note: This method _must_ _not_ call the interrupt handler.
  38         * If you are unable to retrigger the interrupt, do not
  39         * provide a function, or if you do, return non-zero.
  40         */
  41        int (*retrigger)(unsigned int);
  42        /*
  43         * Set the type of the IRQ.
  44         */
  45        int (*type)(unsigned int, unsigned int);
  46        /*
  47         * Set wakeup-enable on the selected IRQ
  48         */
  49        int (*wake)(unsigned int, unsigned int);
  50
  51#ifdef CONFIG_SMP
  52        /*
  53         * Route an interrupt to a CPU
  54         */
  55        void (*set_cpu)(struct irqdesc *desc, unsigned int irq, unsigned int cpu);
  56#endif
  57};
  58
  59struct irqdesc {
  60        irq_handler_t   handle;
  61        struct irqchip  *chip;
  62        struct irqaction *action;
  63        struct list_head pend;
  64        void            *chipdata;
  65        void            *data;
  66        unsigned int    disable_depth;
  67
  68        unsigned int    triggered: 1;           /* IRQ has occurred           */
  69        unsigned int    running  : 1;           /* IRQ is running             */
  70        unsigned int    pending  : 1;           /* IRQ is pending             */
  71        unsigned int    probing  : 1;           /* IRQ in use for a probe     */
  72        unsigned int    probe_ok : 1;           /* IRQ can be used for probe  */
  73        unsigned int    valid    : 1;           /* IRQ claimable              */
  74        unsigned int    noautoenable : 1;       /* don't automatically enable IRQ */
  75        unsigned int    unused   :25;
  76
  77        struct proc_dir_entry *procdir;
  78
  79#ifdef CONFIG_SMP
  80        cpumask_t       affinity;
  81        unsigned int    cpu;
  82#endif
  83
  84        /*
  85         * IRQ lock detection
  86         */
  87        unsigned int    lck_cnt;
  88        unsigned int    lck_pc;
  89        unsigned int    lck_jif;
  90};
  91
  92extern struct irqdesc irq_desc[];
  93
  94/*
  95 * This is internal.  Do not use it.
  96 */
  97extern void (*init_arch_irq)(void);
  98extern void init_FIQ(void);
  99extern int show_fiq_list(struct seq_file *, void *);
 100void __set_irq_handler(unsigned int irq, irq_handler_t, int);
 101
 102/*
 103 * External stuff.
 104 */
 105#define set_irq_handler(irq,handler)            __set_irq_handler(irq,handler,0)
 106#define set_irq_chained_handler(irq,handler)    __set_irq_handler(irq,handler,1)
 107#define set_irq_data(irq,d)                     do { irq_desc[irq].data = d; } while (0)
 108#define set_irq_chipdata(irq,d)                 do { irq_desc[irq].chipdata = d; } while (0)
 109#define get_irq_chipdata(irq)                   (irq_desc[irq].chipdata)
 110
 111void set_irq_chip(unsigned int irq, struct irqchip *);
 112void set_irq_flags(unsigned int irq, unsigned int flags);
 113
 114#define IRQF_VALID      (1 << 0)
 115#define IRQF_PROBE      (1 << 1)
 116#define IRQF_NOAUTOEN   (1 << 2)
 117
 118/*
 119 * Built-in IRQ handlers.
 120 */
 121void do_level_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 122void do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 123void do_simple_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 124void do_bad_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 125void dummy_mask_unmask_irq(unsigned int irq);
 126
 127#endif
 128