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
  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          * 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 (*set_type)(unsigned int, unsigned int);
  46         /*
  47          * Set wakeup-enable on the selected IRQ
  48          */
  49         int (*set_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
  59 struct irqdesc {
  60         irq_handler_t   handle;
  61         struct irqchip  *chip;
  62         struct irqaction *action;
  63         struct list_head pend;
  64         void __iomem    *base;
  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         unsigned int    irqs_unhandled;
  78         struct proc_dir_entry *procdir;
  79
  80 #ifdef CONFIG_SMP
  81         cpumask_t       affinity;
  82         unsigned int    cpu;
  83 #endif
  84
  85         /*
  86          * IRQ lock detection
  87          */
  88         unsigned int    lck_cnt;
  89         unsigned int    lck_pc;
  90         unsigned int    lck_jif;
  91 };
  92
  93 extern struct irqdesc irq_desc[];
  94
  95 /*
  96  * Helpful inline function for calling irq descriptor handlers.
  97  */
  98 static inline void desc_handle_irq(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
  99 {
 100         desc->handle(irq, desc, regs);
 101 }
 102
 103 /*
 104  * This is internal.  Do not use it.
 105  */
 106 extern void (*init_arch_irq)(void);
 107 extern void init_FIQ(void);
 108 extern int show_fiq_list(struct seq_file *, void *);
 109 void __set_irq_handler(unsigned int irq, irq_handler_t, int);
 110
 111 /*
 112  * External stuff.
 113  */
 114 #define set_irq_handler(irq,handler)            __set_irq_handler(irq,handler,0)
 115 #define set_irq_chained_handler(irq,handler)    __set_irq_handler(irq,handler,1)
 116 #define set_irq_data(irq,d)                     do { irq_desc[irq].data = d; } while (0)
 117 #define set_irq_chipdata(irq,d)                 do { irq_desc[irq].base = d; } while (0)
 118 #define get_irq_chipdata(irq)                   (irq_desc[irq].base)
 119
 120 void set_irq_chip(unsigned int irq, struct irqchip *);
 121 void set_irq_flags(unsigned int irq, unsigned int flags);
 122
 123 #define IRQF_VALID      (1 << 0)
 124 #define IRQF_PROBE      (1 << 1)
 125 #define IRQF_NOAUTOEN   (1 << 2)
 126
 127 /*
 128  * Built-in IRQ handlers.
 129  */
 130 void do_level_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 131 void do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 132 void do_simple_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 133 void do_bad_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs);
 134 void dummy_mask_unmask_irq(unsigned int irq);
 135
 136 #endif