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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