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

//

//      synth_watchdog.cxx

//

//      Watchdog driver for the synthetic target

//

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

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

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

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

// Copyright (C) 2002, 2009 Free Software Foundation, 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     

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

// for more details.                                                        

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

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

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//

// 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   

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// General Public License v2.                                               

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

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

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

//

// Author(s):    bartv

// Contributors: bartv

// Date:         2002-09-04

//

//####DESCRIPTIONEND####

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

#include <pkgconf/system.h>

#include <pkgconf/devs_watchdog_synth.h>

#ifdef CYGIMP_WATCHDOG_HARDWARE

#include <cyg/hal/hal_arch.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/infra/cyg_ass.h>

#include <cyg/infra/diag.h>

#include <cyg/hal/hal_io.h>

// FIXME: right now the generic watchdog header depends on the

// kernel. That should be fixed in the watchdog code, but will

// affect some device drivers as well

#include <pkgconf/kernel.h>

#include <cyg/io/watchdog.hxx>

// Protocol between host and target

#define SYNTH_WATCHDOG_START    0x01

#define SYNTH_WATCHDOG_RESET    0x02

// The synthetic target's watchdog implementation involves interaction

// with a watchdog.tcl script running in the I/O auxiliary. The device

// is instantiated during system initialization via the generic

// watchdog package's prioritized constructor. The main

// Cyg_Watchdog::start() and reset() functions involve passing a

// message to the host-side.

//

// There is an open issue re. resolution. Usually the hardware imposes

// limits on what resolutions are valid, in fact there may be only one.

// With the synthetic target it would be possible to configure the

// desired resolution either on the target-side using a CDL option, or

// on the host-side using the target definition file. The resolution

// would have to be fairly coarse, probably at least 0.1 seconds,

// to allow for communication overheads. It is not clear whether

// target-side or host-side configuration is more appropriate, so for

// now a fixed resolution of one second is used.

// Id for communicating with the watchdog instance in the auxiliary

static int aux_id   = -1;

// Hardware initialization.

void

Cyg_Watchdog::init_hw(void)

{

    // SIGPWR is disabled by default. It has to be reenabled.

    struct cyg_hal_sys_sigset_t blocked;

    CYG_HAL_SYS_SIGEMPTYSET(&blocked);

    CYG_HAL_SYS_SIGADDSET(&blocked, CYG_HAL_SYS_SIGPWR);

    cyg_hal_sys_sigprocmask(CYG_HAL_SYS_SIG_UNBLOCK, &blocked, (cyg_hal_sys_sigset_t*) 0);

    resolution = 1000000000LL;

    if (synth_auxiliary_running) {

        aux_id  = synth_auxiliary_instantiate("devs/watchdog/synth",

                                              SYNTH_MAKESTRING(CYGPKG_DEVS_WATCHDOG_SYNTH),

                                              "watchdog",

                                              (const char*) 0,

                                              (const char*) 0);

    }

}

void

Cyg_Watchdog::start(void)

{

    if (synth_auxiliary_running && (-1 != aux_id)) {

        synth_auxiliary_xchgmsg(aux_id, SYNTH_WATCHDOG_START, 0, 0,

                               (const unsigned char*)0, 0,

                               (int *) 0,

                               (unsigned char*) 0, (int*) 0, 0);

    }

}

void

Cyg_Watchdog::reset()

{

    if (synth_auxiliary_running && (-1 != aux_id)) {

        synth_auxiliary_xchgmsg(aux_id, SYNTH_WATCHDOG_RESET, 0, 0,

                               (const unsigned char*)0, 0,

                               (int *) 0,

                               (unsigned char*) 0, (int*) 0, 0);

    }

}

#endif // CYGIMP_WATCHDOG_HARDWARE