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         /* Currently used only by UML, might disappear one day.*/
  51 #ifdef CONFIG_IRQ_RELEASE_METHOD
  52         void (*release)(unsigned int irq, void *dev_id);
  53 #endif
  54 };
  55
  56 typedef struct hw_interrupt_type  hw_irq_controller;
  57
  58 /*
  59  * This is the "IRQ descriptor", which contains various information
  60  * about the irq, including what kind of hardware handling it has,
  61  * whether it is disabled etc etc.
  62  *
  63  * Pad this out to 32 bytes for cache and indexing reasons.
  64  */
  65 typedef struct irq_desc {
  66         hw_irq_controller *handler;
  67         void *handler_data;
  68         struct irqaction *action;       /* IRQ action list */
  69         unsigned int status;            /* IRQ status */
  70         unsigned int depth;             /* nested irq disables */
  71         unsigned int irq_count;         /* For detecting broken interrupts */
  72         unsigned int irqs_unhandled;
  73         spinlock_t lock;
  74 } ____cacheline_aligned irq_desc_t;
  75
  76 extern irq_desc_t irq_desc [NR_IRQS];
  77
  78 #include <asm/hw_irq.h> /* the arch dependent stuff */
  79
  80 extern int setup_irq(unsigned int irq, struct irqaction * new);
  81
  82 #ifdef CONFIG_GENERIC_HARDIRQS
  83 extern cpumask_t irq_affinity[NR_IRQS];
  84 extern int no_irq_affinity;
  85 extern int noirqdebug_setup(char *str);
  86
  87 extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
  88                                         struct irqaction *action);
  89 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
  90 extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
  91                                         int action_ret, struct pt_regs *regs);
  92 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
  93
  94 extern void init_irq_proc(void);
  95 #endif
  96
  97 extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
  98
  99 #endif
 100
 101 #endif /* __irq_h */