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//==========================================================================
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//
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// synth_watchdog.cxx
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//
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// Watchdog driver for the synthetic target
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 2002, 2009 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): bartv
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// Contributors: bartv
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// Date: 2002-09-04
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//
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//####DESCRIPTIONEND####
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//==========================================================================
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#include <pkgconf/system.h>
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#include <pkgconf/devs_watchdog_synth.h>
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#ifdef CYGIMP_WATCHDOG_HARDWARE
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#include <cyg/hal/hal_arch.h>
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#include <cyg/infra/cyg_type.h>
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#include <cyg/infra/cyg_ass.h>
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#include <cyg/infra/diag.h>
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#include <cyg/hal/hal_io.h>
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// FIXME: right now the generic watchdog header depends on the
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// kernel. That should be fixed in the watchdog code, but will
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// affect some device drivers as well
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#include <pkgconf/kernel.h>
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#include <cyg/io/watchdog.hxx>
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// Protocol between host and target
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#define SYNTH_WATCHDOG_START 0x01
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#define SYNTH_WATCHDOG_RESET 0x02
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// The synthetic target's watchdog implementation involves interaction
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// with a watchdog.tcl script running in the I/O auxiliary. The device
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// is instantiated during system initialization via the generic
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// watchdog package's prioritized constructor. The main
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// Cyg_Watchdog::start() and reset() functions involve passing a
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// message to the host-side.
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//
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// There is an open issue re. resolution. Usually the hardware imposes
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// limits on what resolutions are valid, in fact there may be only one.
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// With the synthetic target it would be possible to configure the
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// desired resolution either on the target-side using a CDL option, or
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// on the host-side using the target definition file. The resolution
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// would have to be fairly coarse, probably at least 0.1 seconds,
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// to allow for communication overheads. It is not clear whether
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// target-side or host-side configuration is more appropriate, so for
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// now a fixed resolution of one second is used.
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// Id for communicating with the watchdog instance in the auxiliary
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static int aux_id = -1;
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// Hardware initialization.
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void
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Cyg_Watchdog::init_hw(void)
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{
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// SIGPWR is disabled by default. It has to be reenabled.
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struct cyg_hal_sys_sigset_t blocked;
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CYG_HAL_SYS_SIGEMPTYSET(&blocked);
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CYG_HAL_SYS_SIGADDSET(&blocked, CYG_HAL_SYS_SIGPWR);
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cyg_hal_sys_sigprocmask(CYG_HAL_SYS_SIG_UNBLOCK, &blocked, (cyg_hal_sys_sigset_t*) 0);
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resolution = 1000000000LL;
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if (synth_auxiliary_running) {
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aux_id = synth_auxiliary_instantiate("devs/watchdog/synth",
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SYNTH_MAKESTRING(CYGPKG_DEVS_WATCHDOG_SYNTH),
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"watchdog",
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(const char*) 0,
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(const char*) 0);
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}
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}
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void
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Cyg_Watchdog::start(void)
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{
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if (synth_auxiliary_running && (-1 != aux_id)) {
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synth_auxiliary_xchgmsg(aux_id, SYNTH_WATCHDOG_START, 0, 0,
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(const unsigned char*)0, 0,
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(int *) 0,
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(unsigned char*) 0, (int*) 0, 0);
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}
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}
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void
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Cyg_Watchdog::reset()
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{
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if (synth_auxiliary_running && (-1 != aux_id)) {
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synth_auxiliary_xchgmsg(aux_id, SYNTH_WATCHDOG_RESET, 0, 0,
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(const unsigned char*)0, 0,
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(int *) 0,
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(unsigned char*) 0, (int*) 0, 0);
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}
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}
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#endif // CYGIMP_WATCHDOG_HARDWARE
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