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#ifndef __irq_h
#define __irq_h

/*
 * Please do not include this file in generic code.  There is currently
 * no requirement for any architecture to implement anything held
 * within this file.
 *
 * Thanks. --rmk
 */

#include <linux/config.h>

#if !defined(CONFIG_ARCH_S390)

#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>

#include <asm/irq.h>
#include <asm/ptrace.h>

/*
 * IRQ line status.
 */
#define IRQ_INPROGRESS  1       /* IRQ handler active - do not enter! */
#define IRQ_DISABLED    2       /* IRQ disabled - do not enter! */
#define IRQ_PENDING     4       /* IRQ pending - replay on enable */
#define IRQ_REPLAY      8       /* IRQ has been replayed but not acked yet */
#define IRQ_AUTODETECT  16      /* IRQ is being autodetected */
#define IRQ_WAITING     32      /* IRQ not yet seen - for autodetection */
#define IRQ_LEVEL       64      /* IRQ level triggered */
#define IRQ_MASKED      128     /* IRQ masked - shouldn't be seen again */
#define IRQ_PER_CPU     256     /* IRQ is per CPU */

/*
 * Interrupt controller descriptor. This is all we need
 * to describe about the low-level hardware.
 */
struct hw_interrupt_type {
        const char * typename;
        unsigned int (*startup)(unsigned int irq);
        void (*shutdown)(unsigned int irq);
        void (*enable)(unsigned int irq);
        void (*disable)(unsigned int irq);
        void (*ack)(unsigned int irq);
        void (*end)(unsigned int irq);
        void (*set_affinity)(unsigned int irq, cpumask_t dest);
};

typedef struct hw_interrupt_type  hw_irq_controller;

/*
 * This is the "IRQ descriptor", which contains various information
 * about the irq, including what kind of hardware handling it has,
 * whether it is disabled etc etc.
 *
 * Pad this out to 32 bytes for cache and indexing reasons.
 */
typedef struct irq_desc {
        unsigned int status;            /* IRQ status */
        hw_irq_controller *handler;
        struct irqaction *action;       /* IRQ action list */
        unsigned int depth;             /* nested irq disables */
        unsigned int irq_count;         /* For detecting broken interrupts */
        unsigned int irqs_unhandled;
        spinlock_t lock;
} ____cacheline_aligned irq_desc_t;

extern irq_desc_t irq_desc [NR_IRQS];

#include <asm/hw_irq.h> /* the arch dependent stuff */

extern int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
extern int setup_irq(unsigned int , struct irqaction * );

extern hw_irq_controller no_irq_type;  /* needed in every arch ? */

#endif

#endif /* __irq_h */