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 #define IRQ_PER_CPU     256     /* IRQ is per CPU */
  22
  23 /*
  24  * Interrupt controller descriptor. This is all we need
  25  * to describe about the low-level hardware.
  26  */
  27 struct hw_interrupt_type {
  28         const char * typename;
  29         unsigned int (*startup)(unsigned int irq);
  30         void (*shutdown)(unsigned int irq);
  31         void (*enable)(unsigned int irq);
  32         void (*disable)(unsigned int irq);
  33         void (*ack)(unsigned int irq);
  34         void (*end)(unsigned int irq);
  35         void (*set_affinity)(unsigned int irq, unsigned long mask);
  36 };
  37
  38 typedef struct hw_interrupt_type  hw_irq_controller;
  39
  40 /*
  41  * This is the "IRQ descriptor", which contains various information
  42  * about the irq, including what kind of hardware handling it has,
  43  * whether it is disabled etc etc.
  44  *
  45  * Pad this out to 32 bytes for cache and indexing reasons.
  46  */
  47 typedef struct {
  48         unsigned int status;            /* IRQ status */
  49         hw_irq_controller *handler;
  50         struct irqaction *action;       /* IRQ action list */
  51         unsigned int depth;             /* nested irq disables */
  52         spinlock_t lock;
  53 } ____cacheline_aligned irq_desc_t;
  54
  55 extern irq_desc_t irq_desc [NR_IRQS];
  56
  57 #include <asm/hw_irq.h> /* the arch dependent stuff */
  58
  59 extern int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
  60 extern int setup_irq(unsigned int , struct irqaction * );
  61
  62 extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
  63 extern void no_action(int cpl, void *dev_id, struct pt_regs *regs);
  64
  65 extern volatile unsigned long irq_err_count;
  66
  67 #endif /* __asm_h */
  68