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

//

//      io/watchdog/watchdog.cxx

//

//      Watchdog common code

//

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

//####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:         1999-02-18

// Purpose:      Watchdog class implementation

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/system.h>             // system configuration file

#include <pkgconf/watchdog.h>           // configuration for this package

#include <cyg/infra/cyg_trac.h>         // tracing macros

#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/drv_api.h>            // for locking

#include <cyg/io/watchdog.hxx>          // watchdog API

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

// Statics

// A static pointer to the single system defined watchdog device.

Cyg_Watchdog Cyg_Watchdog::watchdog;

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

// Constructor

Cyg_Watchdog::Cyg_Watchdog()

{

    CYG_REPORT_FUNCTION();

#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT    

    action_list         = 0;

#endif

    // HW driver initialization. This must set the watchdog resolution.

    init_hw();

    CYG_REPORT_RETURN();

}

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

// Return reset resolution

cyg_uint64

Cyg_Watchdog::get_resolution()

{

    return resolution;

}

#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT

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

// Trigger the watchdog as if the timer had expired. This should be called

// from the driver's ISR.

void

Cyg_Watchdog::trigger()

{

    CYG_REPORT_FUNCTION();

    cyg_drv_dsr_lock();

    Cyg_Watchdog_Action *act = action_list;

    while( 0 != act )

    {

        act->action( act->data );

        act = act->next;

    }

    cyg_drv_dsr_unlock();

    CYG_REPORT_RETURN();

}

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

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

// triggers.

void

Cyg_Watchdog::install_action( Cyg_Watchdog_Action *action )

{

    CYG_REPORT_FUNCTION();

    cyg_drv_dsr_lock();

    action->next = action_list;

    action_list = action;

    cyg_drv_dsr_unlock();

    CYG_REPORT_RETURN();

}

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

// Deregister a previously registered action routine.

void

Cyg_Watchdog::uninstall_action( Cyg_Watchdog_Action *action )

{

    CYG_REPORT_FUNCTION();

    cyg_drv_dsr_lock();

    Cyg_Watchdog_Action **act_ptr = &action_list;

    while( 0 != *act_ptr )

    {

        Cyg_Watchdog_Action *a = *act_ptr;

        if( a == action )

        {

            *act_ptr = a->next;

            break;

        }

        act_ptr = &a->next;

    }

    cyg_drv_dsr_unlock();

    CYG_REPORT_RETURN();

}

#endif // CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT

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

// EOF io/watchdog/watchdog.cxx