LXR linux-old/include/linux/irq.h

   1#ifndef __irq_h
   2#define __irq_h
   3
   4/*
   5 * Please do not include this file in generic code.  There is currently
   6 * no requirement for any architecture to implement anything held
   7 * within this file.
   8 *
   9 * Thanks. --rmk
  10 */
  11
  12#include <linux/config.h>
  13
  14#if !defined(CONFIG_ARCH_S390)
  15
  16#include <linux/cache.h>
  17#include <linux/spinlock.h>
  18
  19#include <asm/irq.h>
  20#include <asm/ptrace.h>
  21
  22/*
  23 * IRQ line status.
  24 */
  25#define IRQ_INPROGRESS  1       /* IRQ handler active - do not enter! */
  26#define IRQ_DISABLED    2       /* IRQ disabled - do not enter! */
  27#define IRQ_PENDING     4       /* IRQ pending - replay on enable */
  28#define IRQ_REPLAY      8       /* IRQ has been replayed but not acked yet */
  29#define IRQ_AUTODETECT  16      /* IRQ is being autodetected */
  30#define IRQ_WAITING     32      /* IRQ not yet seen - for autodetection */
  31#define IRQ_LEVEL       64      /* IRQ level triggered */
  32#define IRQ_MASKED      128     /* IRQ masked - shouldn't be seen again */
  33#define IRQ_PER_CPU     256     /* IRQ is per CPU */
  34
  35/*
  36 * Interrupt controller descriptor. This is all we need
  37 * to describe about the low-level hardware. 
  38 */
  39struct hw_interrupt_type {
  40        const char * typename;
  41        unsigned int (*startup)(unsigned int irq);
  42        void (*shutdown)(unsigned int irq);
  43        void (*enable)(unsigned int irq);
  44        void (*disable)(unsigned int irq);
  45        void (*ack)(unsigned int irq);
  46        void (*end)(unsigned int irq);
  47        void (*set_affinity)(unsigned int irq, unsigned long mask);
  48};
  49
  50typedef struct hw_interrupt_type  hw_irq_controller;
  51
  52/*
  53 * This is the "IRQ descriptor", which contains various information
  54 * about the irq, including what kind of hardware handling it has,
  55 * whether it is disabled etc etc.
  56 *
  57 * Pad this out to 32 bytes for cache and indexing reasons.
  58 */
  59typedef struct {
  60        unsigned int status;            /* IRQ status */
  61        hw_irq_controller *handler;
  62        struct irqaction *action;       /* IRQ action list */
  63        unsigned int depth;             /* nested irq disables */
  64        spinlock_t lock;
  65} ____cacheline_aligned irq_desc_t;
  66
  67extern irq_desc_t irq_desc [NR_IRQS];
  68
  69#include <asm/hw_irq.h> /* the arch dependent stuff */
  70
  71extern int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
  72extern int setup_irq(unsigned int , struct irqaction * );
  73
  74extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
  75extern void no_action(int cpl, void *dev_id, struct pt_regs *regs);
  76
  77#endif
  78
  79#endif /* __irq_h */
  80