include/linux/irq.h

   1 #ifndef __irq_h
   2 #define __irq_h
   3
   4 #include <linux/cache.h>
   5 #include <linux/spinlock.h>
   6
   7 #include <asm/irq.h>
   8 #include <asm/ptrace.h>
   9
  10 /*
  11  * IRQ line status.
  12  */
  13 #define IRQ_INPROGRESS  1       /* IRQ handler active - do not enter! */
  14 #define IRQ_DISABLED    2       /* IRQ disabled - do not enter! */
  15 #define IRQ_PENDING     4       /* IRQ pending - replay on enable */
  16 #define IRQ_REPLAY      8       /* IRQ has been replayed but not acked yet */
  17 #define IRQ_AUTODETECT  16      /* IRQ is being autodetected */
  18 #define IRQ_WAITING     32      /* IRQ not yet seen - for autodetection */
  19 #define IRQ_LEVEL       64      /* IRQ level triggered */
  20 #define IRQ_MASKED      128     /* IRQ masked - shouldn't be seen again */
  21
  22 /*
  23  * Interrupt controller descriptor. This is all we need
  24  * to describe about the low-level hardware.
  25  */
  26 struct hw_interrupt_type {
  27         const char * typename;
  28         unsigned int (*startup)(unsigned int irq);
  29         void (*shutdown)(unsigned int irq);
  30         void (*enable)(unsigned int irq);
  31         void (*disable)(unsigned int irq);
  32         void (*ack)(unsigned int irq);
  33         void (*end)(unsigned int irq);
  34         void (*set_affinity)(unsigned int irq, unsigned long mask);
  35 };
  36
  37 typedef struct hw_interrupt_type  hw_irq_controller;
  38
  39 /*
  40  * This is the "IRQ descriptor", which contains various information
  41  * about the irq, including what kind of hardware handling it has,
  42  * whether it is disabled etc etc.
  43  *
  44  * Pad this out to 32 bytes for cache and indexing reasons.
  45  */
  46 typedef struct {
  47         unsigned int status;            /* IRQ status */
  48         hw_irq_controller *handler;
  49         struct irqaction *action;       /* IRQ action list */
  50         unsigned int depth;             /* nested irq disables */
  51         spinlock_t lock;
  52 } ____cacheline_aligned irq_desc_t;
  53
  54 extern irq_desc_t irq_desc [NR_IRQS];
  55
  56 #include <asm/hw_irq.h> /* the arch dependent stuff */
  57
  58 extern int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
  59 extern int setup_irq(unsigned int , struct irqaction * );
  60
  61 extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
  62 extern void no_action(int cpl, void *dev_id, struct pt_regs *regs);
  63
  64 extern volatile unsigned long irq_err_count;
  65
  66 #endif /* __asm_h */
  67