//==========================================================================
|
//==========================================================================
|
//
|
//
|
// io/watchdog/emulate.cxx
|
// io/watchdog/emulate.cxx
|
//
|
//
|
// Watchdog implementation emulation
|
// Watchdog implementation emulation
|
//
|
//
|
//==========================================================================
|
//==========================================================================
|
//####ECOSGPLCOPYRIGHTBEGIN####
|
//####ECOSGPLCOPYRIGHTBEGIN####
|
// -------------------------------------------
|
// -------------------------------------------
|
// This file is part of eCos, the Embedded Configurable Operating System.
|
// This file is part of eCos, the Embedded Configurable Operating System.
|
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
|
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
|
//
|
//
|
// eCos is free software; you can redistribute it and/or modify it under
|
// 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
|
// 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.
|
// 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
|
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
|
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// for more details.
|
// for more details.
|
//
|
//
|
// You should have received a copy of the GNU General Public License along
|
// You should have received a copy of the GNU General Public License along
|
// with eCos; if not, write to the Free Software Foundation, Inc.,
|
// with eCos; if not, write to the Free Software Foundation, Inc.,
|
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
//
|
//
|
// As a special exception, if other files instantiate templates or use macros
|
// 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
|
// 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
|
// 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
|
// 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
|
// License. However the source code for this file must still be made available
|
// in accordance with section (3) of the GNU General Public License.
|
// 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 exception does not invalidate any other reasons why a work based on
|
// this file might be covered by the GNU General Public License.
|
// this file might be covered by the GNU General Public License.
|
//
|
//
|
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
|
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
|
// at http://sources.redhat.com/ecos/ecos-license/
|
// at http://sources.redhat.com/ecos/ecos-license/
|
// -------------------------------------------
|
// -------------------------------------------
|
//####ECOSGPLCOPYRIGHTEND####
|
//####ECOSGPLCOPYRIGHTEND####
|
//==========================================================================
|
//==========================================================================
|
//#####DESCRIPTIONBEGIN####
|
//#####DESCRIPTIONBEGIN####
|
//
|
//
|
// Author(s): nickg
|
// Author(s): nickg
|
// Contributors: nickg
|
// Contributors: nickg
|
// Date: 1998-07-29
|
// Date: 1998-07-29
|
// Purpose: Watchdog class implementation
|
// Purpose: Watchdog class implementation
|
// Description: Contains an implementation of the Watchdog class for use
|
// Description: Contains an implementation of the Watchdog class for use
|
// when there is no hardware watchdog timer. Instead it is
|
// when there is no hardware watchdog timer. Instead it is
|
// emulated using an Alarm object.
|
// emulated using an Alarm object.
|
//
|
//
|
//####DESCRIPTIONEND####
|
//####DESCRIPTIONEND####
|
//
|
//
|
//==========================================================================
|
//==========================================================================
|
|
|
#include <pkgconf/watchdog.h> // watchdog configuration file
|
#include <pkgconf/watchdog.h> // watchdog configuration file
|
#include <pkgconf/kernel.h> // Kernel config
|
#include <pkgconf/kernel.h> // Kernel config
|
|
|
#include <cyg/kernel/ktypes.h> // base kernel types
|
#include <cyg/kernel/ktypes.h> // base kernel types
|
#include <cyg/infra/cyg_trac.h> // tracing macros
|
#include <cyg/infra/cyg_trac.h> // tracing macros
|
#include <cyg/infra/cyg_ass.h> // assertion macros
|
#include <cyg/infra/cyg_ass.h> // assertion macros
|
#include <cyg/kernel/instrmnt.h> // instrumentation
|
#include <cyg/kernel/instrmnt.h> // instrumentation
|
|
|
#include <cyg/kernel/clock.hxx> // clock and alarm
|
#include <cyg/kernel/clock.hxx> // clock and alarm
|
#include <cyg/kernel/sched.hxx> // scheduler
|
#include <cyg/kernel/sched.hxx> // scheduler
|
|
|
#include <cyg/io/watchdog.hxx> // watchdog API
|
#include <cyg/io/watchdog.hxx> // watchdog API
|
|
|
#include <cyg/kernel/sched.inl> // scheduler inlines
|
#include <cyg/kernel/sched.inl> // scheduler inlines
|
|
|
// -------------------------------------------------------------------------
|
// -------------------------------------------------------------------------
|
// Forward definitions
|
// Forward definitions
|
|
|
static cyg_alarm_fn watchdog_alarm;
|
static cyg_alarm_fn watchdog_alarm;
|
|
|
// -------------------------------------------------------------------------
|
// -------------------------------------------------------------------------
|
// Statics
|
// Statics
|
|
|
static Cyg_Alarm alarm( Cyg_Clock::real_time_clock, watchdog_alarm, 0 );
|
static Cyg_Alarm alarm( Cyg_Clock::real_time_clock, watchdog_alarm, 0 );
|
|
|
// One second's worth of ticks.
|
// One second's worth of ticks.
|
static cyg_tick_count one_sec;
|
static cyg_tick_count one_sec;
|
|
|
// -------------------------------------------------------------------------
|
// -------------------------------------------------------------------------
|
// HW init
|
// HW init
|
|
|
void
|
void
|
Cyg_Watchdog::init_hw(void)
|
Cyg_Watchdog::init_hw(void)
|
{
|
{
|
CYG_REPORT_FUNCTION();
|
CYG_REPORT_FUNCTION();
|
|
|
Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
|
Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
|
|
|
one_sec = ( res.divisor * 1000000000LL ) / res.dividend ;
|
one_sec = ( res.divisor * 1000000000LL ) / res.dividend ;
|
|
|
resolution = 1000000000LL;
|
resolution = 1000000000LL;
|
|
|
CYG_REPORT_RETURN();
|
CYG_REPORT_RETURN();
|
}
|
}
|
|
|
// -------------------------------------------------------------------------
|
// -------------------------------------------------------------------------
|
// Start the watchdog running.
|
// Start the watchdog running.
|
|
|
void Cyg_Watchdog::start()
|
void Cyg_Watchdog::start()
|
{
|
{
|
CYG_REPORT_FUNCTION();
|
CYG_REPORT_FUNCTION();
|
|
|
Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
|
Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
|
|
|
// Set alarm to a one second single-shot trigger
|
// Set alarm to a one second single-shot trigger
|
alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
|
alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
|
|
|
CYG_REPORT_RETURN();
|
CYG_REPORT_RETURN();
|
}
|
}
|
|
|
// -------------------------------------------------------------------------
|
// -------------------------------------------------------------------------
|
// Reset watchdog timer. This needs to be called regularly to prevent
|
// Reset watchdog timer. This needs to be called regularly to prevent
|
// the watchdog firing.
|
// the watchdog firing.
|
|
|
void Cyg_Watchdog::reset()
|
void Cyg_Watchdog::reset()
|
{
|
{
|
CYG_REPORT_FUNCTION();
|
CYG_REPORT_FUNCTION();
|
|
|
Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
|
Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
|
|
|
Cyg_Scheduler::lock();
|
Cyg_Scheduler::lock();
|
|
|
// Set alarm to a one second single-shot trigger
|
// Set alarm to a one second single-shot trigger
|
alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
|
alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
|
|
|
Cyg_Scheduler::unlock();
|
Cyg_Scheduler::unlock();
|
|
|
CYG_REPORT_RETURN();
|
CYG_REPORT_RETURN();
|
}
|
}
|
|
|
// -------------------------------------------------------------------------
|
// -------------------------------------------------------------------------
|
// Alarm function
|
// Alarm function
|
|
|
void watchdog_alarm( Cyg_Alarm *a, CYG_ADDRWORD data)
|
void watchdog_alarm( Cyg_Alarm *a, CYG_ADDRWORD data)
|
{
|
{
|
CYG_REPORT_FUNCTION();
|
CYG_REPORT_FUNCTION();
|
|
|
// Disable alarm just in case
|
// Disable alarm just in case
|
alarm.disable();
|
alarm.disable();
|
|
|
Cyg_Watchdog::watchdog.trigger();
|
Cyg_Watchdog::watchdog.trigger();
|
}
|
}
|
|
|
// -------------------------------------------------------------------------
|
// -------------------------------------------------------------------------
|
// EOF watchdog/emulate.cxx
|
// EOF watchdog/emulate.cxx
|
|
|