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#ifndef CYGONCE_DEVS_WATCHDOG_HXX

#define CYGONCE_DEVS_WATCHDOG_HXX

//==========================================================================

//

//      watchdog.hxx

//

//      Watchdog interface declaration

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   nickg

// Contributors:        nickg

// Date:        1998-07-14

// Purpose:     Watchdog declarations

// Description: This file defines the interface to the watchdog device

//              that provides timer based recovery from software and

//              hardware faults.

// Usage:       #include 

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include 

#include             // assertion macros

class Cyg_Watchdog_Action;

// -------------------------------------------------------------------------

// Watchdog class

class Cyg_Watchdog

{

    Cyg_Watchdog_Action         *action_list;

    cyg_uint64                  resolution;

public:

    Cyg_Watchdog();

    // Return time interval allowed between resets before watchdog

    // triggers, in nanoseconds.

    cyg_uint64 get_resolution( void );

    // Start the watchdog running.

    void start( void );

    // Reset watchdog timer. This needs to be called regularly to prevent

    // the watchdog firing.

    void reset( void );

#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT

    // Trigger the watchdog as if the timer had expired.

    void trigger( void );

    // Register an action routine that will be called when the timer

    // triggers.

    void install_action( Cyg_Watchdog_Action *wdaction );

    // Deregister a previously registered action routine.

    void uninstall_action( Cyg_Watchdog_Action *wdaction );

#endif

    // A static instance of the single system defined watchdog device.

    static Cyg_Watchdog watchdog;

private:

    void init_hw( void );

};

#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT

// -------------------------------------------------------------------------

// Watchdog action class

class Cyg_Watchdog_Action

{

    friend class Cyg_Watchdog;

    Cyg_Watchdog_Action         *next;          // link in chain

    void (*action)( CYG_ADDRWORD data );        // action function

    CYG_ADDRWORD data;                          // data argument

public:

    Cyg_Watchdog_Action(

        void (*action)( CYG_ADDRWORD data ),

        CYG_ADDRWORD data

        );

    ~Cyg_Watchdog_Action();

    void install();

    void uninstall();

};

// -------------------------------------------------------------------------

// Cyg_Watchdog_Action inlines

inline Cyg_Watchdog_Action::Cyg_Watchdog_Action(

    void (*action_arg)( CYG_ADDRWORD data ),

    CYG_ADDRWORD data_arg

    )

{

    next        = NULL;

    action      = action_arg;

    data        = data_arg;

}

inline Cyg_Watchdog_Action::~Cyg_Watchdog_Action()

{

    Cyg_Watchdog::watchdog.uninstall_action( this );

}

inline void Cyg_Watchdog_Action::install()

{

    Cyg_Watchdog::watchdog.install_action( this );

}

inline void Cyg_Watchdog_Action::uninstall()

{

    Cyg_Watchdog::watchdog.uninstall_action( this );

}

#endif // CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT

// -------------------------------------------------------------------------

#endif // ifndef CYGONCE_DEVS_WATCHDOG_HXX

// EOF watchdog.hxx