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/linkage.h>
  17 #include <linux/cache.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/cpumask.h>
  20
  21 #include <asm/irq.h>
  22 #include <asm/ptrace.h>
  23
  24 /*
  25  * IRQ line status.
  26  */
  27 #define IRQ_INPROGRESS  1       /* IRQ handler active - do not enter! */
  28 #define IRQ_DISABLED    2       /* IRQ disabled - do not enter! */
  29 #define IRQ_PENDING     4       /* IRQ pending - replay on enable */
  30 #define IRQ_REPLAY      8       /* IRQ has been replayed but not acked yet */
  31 #define IRQ_AUTODETECT  16      /* IRQ is being autodetected */
  32 #define IRQ_WAITING     32      /* IRQ not yet seen - for autodetection */
  33 #define IRQ_LEVEL       64      /* IRQ level triggered */
  34 #define IRQ_MASKED      128     /* IRQ masked - shouldn't be seen again */
  35 #define IRQ_PER_CPU     256     /* IRQ is per CPU */
  36
  37 /*
  38  * Interrupt controller descriptor. This is all we need
  39  * to describe about the low-level hardware.
  40  */
  41 struct hw_interrupt_type {
  42         const char * typename;
  43         unsigned int (*startup)(unsigned int irq);
  44         void (*shutdown)(unsigned int irq);
  45         void (*enable)(unsigned int irq);
  46         void (*disable)(unsigned int irq);
  47         void (*ack)(unsigned int irq);
  48         void (*end)(unsigned int irq);
  49         void (*set_affinity)(unsigned int irq, cpumask_t dest);
  50 };
  51
  52 typedef struct hw_interrupt_type  hw_irq_controller;
  53
  54 /*
  55  * This is the "IRQ descriptor", which contains various information
  56  * about the irq, including what kind of hardware handling it has,
  57  * whether it is disabled etc etc.
  58  *
  59  * Pad this out to 32 bytes for cache and indexing reasons.
  60  */
  61 typedef struct irq_desc {
  62         hw_irq_controller *handler;
  63         void *handler_data;
  64         struct irqaction *action;       /* IRQ action list */
  65         unsigned int status;            /* IRQ status */
  66         unsigned int depth;             /* nested irq disables */
  67         unsigned int irq_count;         /* For detecting broken interrupts */
  68         unsigned int irqs_unhandled;
  69         spinlock_t lock;
  70 } ____cacheline_aligned irq_desc_t;
  71
  72 extern irq_desc_t irq_desc [NR_IRQS];
  73
  74 #include <asm/hw_irq.h> /* the arch dependent stuff */
  75
  76 extern int setup_irq(unsigned int irq, struct irqaction * new);
  77
  78 #ifdef CONFIG_GENERIC_HARDIRQS
  79 extern cpumask_t irq_affinity[NR_IRQS];
  80 extern int no_irq_affinity;
  81 extern int noirqdebug_setup(char *str);
  82
  83 extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
  84                                        struct irqaction *action);
  85 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
  86 extern void note_interrupt(unsigned int irq, irq_desc_t *desc, int action_ret);
  87 extern void report_bad_irq(unsigned int irq, irq_desc_t *desc, int action_ret);
  88 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
  89
  90 extern void init_irq_proc(void);
  91 #endif
  92
  93 extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
  94
  95 #endif
  96
  97 #endif /* __irq_h */