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/*
 * Copyright (c) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup genericddi
 * @{
 */
/** @file
 */

#ifndef KERN_IRQ_H_
#define KERN_IRQ_H_

typedef enum {
    CMD_MEM_READ_1 = 0,
    CMD_MEM_READ_2,
    CMD_MEM_READ_4,
    CMD_MEM_READ_8,
    CMD_MEM_WRITE_1,
    CMD_MEM_WRITE_2,
    CMD_MEM_WRITE_4,
    CMD_MEM_WRITE_8,
    CMD_PORT_READ_1,
    CMD_PORT_WRITE_1,
    CMD_LAST
} irq_cmd_type;

typedef struct {
    irq_cmd_type cmd;
    void *addr;
    unsigned long long value; 
    int dstarg;
} irq_cmd_t;

typedef struct {
    unsigned int cmdcount;
    irq_cmd_t *cmds;
} irq_code_t;

#ifdef KERNEL

#include <arch/types.h>
#include <adt/list.h>
#include <synch/spinlock.h>
#include <proc/task.h>

typedef enum {
    IRQ_DECLINE,        /**< Decline to service. */
    IRQ_ACCEPT      /**< Accept to service. */
} irq_ownership_t;

typedef enum {
    IRQ_TRIGGER_LEVEL = 1,
    IRQ_TRIGGER_EDGE
} irq_trigger_t;

struct irq;
typedef void (* irq_handler_t)(struct irq *irq, void *arg, ...);

/** Type for function used to clear the interrupt. */
typedef void (* cir_t)(void *arg, inr_t inr);

/** IPC notification config structure.
 *
 * Primarily, this structure is encapsulated in the irq_t structure.
 * It is protected by irq_t::lock.
 */
typedef struct {
    /** When false, notifications are not sent. */
    bool notify;
    /** Answerbox for notifications. */
    answerbox_t *answerbox;
    /** Method to be used for the notification. */
    unative_t method;
    /** Top-half pseudocode. */
    irq_code_t *code;
    /** Counter. */
    count_t counter;
    /**
     * Link between IRQs that are notifying the same answerbox. The list is
     * protected by the answerbox irq_lock.
     */
    link_t link;
} ipc_notif_cfg_t;

/** Structure representing one device IRQ.
 *
 * If one device has multiple interrupts, there will be multiple irq_t
 * instantions with the same devno.
 */
typedef struct irq {
    /** Hash table link. */
    link_t link;

    /** Lock protecting everything in this structure
     *  except the link member. When both the IRQ
     *  hash table lock and this lock are to be acquired,
     *  this lock must not be taken first.
     */
    SPINLOCK_DECLARE(lock);
    
    /** Send EOI before processing the interrupt.
     *  This is essential for timer interrupt which
     *  has to be acknowledged before doing preemption
     *  to make sure another timer interrupt will
     *  be eventually generated.
     */
    bool preack;

    /** Unique device number. -1 if not yet assigned. */
    devno_t devno;

    /** Actual IRQ number. -1 if not yet assigned. */
    inr_t inr;
    /** Trigger level of the IRQ. */
    irq_trigger_t trigger;
    /** Claim ownership of the IRQ. */
    irq_ownership_t (* claim)(void);
    /** Handler for this IRQ and device. */
    irq_handler_t handler;
    /** Argument for the handler. */
    void *arg;

    /** Clear interrupt routine. */
    cir_t cir;
    /** First argument to the clear interrupt routine. */
    void *cir_arg;

    /** Notification configuration structure. */
    ipc_notif_cfg_t notif_cfg; 
} irq_t;

extern void irq_init(count_t inrs, count_t chains);
extern void irq_initialize(irq_t *irq);
extern void irq_register(irq_t *irq);
extern irq_t *irq_dispatch_and_lock(inr_t inr);
extern irq_t *irq_find_and_lock(inr_t inr, devno_t devno);

#endif

#endif

/** @}
 */