//==========================================================================
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//==========================================================================
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//
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//
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// devs/wallclock/wallclock.cxx
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// devs/wallclock/wallclock.cxx
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//
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//
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// Wallclock base
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// Wallclock base
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//
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//
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//==========================================================================
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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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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// 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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// 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 version.
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// 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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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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// for more details.
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//
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//
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// You should have received a copy of the GNU General Public License along
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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//
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// As a special exception, if other files instantiate templates or use macros
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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// in accordance with section (3) of the GNU General Public License.
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//
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//
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// This exception does not invalidate any other reasons why a work based on
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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// this file might be covered by the GNU General Public License.
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//
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//#####DESCRIPTIONBEGIN####
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//
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//
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// Author(s): jskov
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// Author(s): jskov
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// Contributors: jskov
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// Contributors: jskov
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// Date: 2000-03-28
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// Date: 2000-03-28
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// Purpose: Wallclock base driver
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// Purpose: Wallclock base driver
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// Description: This provides a generic wallclock base driver which
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// Description: This provides a generic wallclock base driver which
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// relies on sub-drivers to provide the interface functions
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// relies on sub-drivers to provide the interface functions
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// to the hardware device (see wallclock.hxx for details).
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// to the hardware device (see wallclock.hxx for details).
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//
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//
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// The driver can be configured to run in one of two modes:
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// The driver can be configured to run in one of two modes:
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// init-get mode:
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// init-get mode:
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// In this mode, the hardware driver only needs to
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// In this mode, the hardware driver only needs to
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// implement a function to read the hardware clock
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// implement a function to read the hardware clock
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// and a (possibly empty) init function which makes
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// and a (possibly empty) init function which makes
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// sure the hardware clock is properly initialized.
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// sure the hardware clock is properly initialized.
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// While the driver in this mode has a smaller memory
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// While the driver in this mode has a smaller memory
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// foot-print, it does not support battery-backed up
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// foot-print, it does not support battery-backed up
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// clocks.
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// clocks.
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//
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//
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// set-get mode:
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// set-get mode:
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// Requires both set and get functions for the hardware
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// Requires both set and get functions for the hardware
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// device. While bigger, it allows support of
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// device. While bigger, it allows support of
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// battery-backed up clocks.
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// battery-backed up clocks.
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//
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//
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//
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//
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//####DESCRIPTIONEND####
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//####DESCRIPTIONEND####
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//
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//
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//==========================================================================
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//==========================================================================
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#include <pkgconf/wallclock.h> // Wallclock device config
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#include <pkgconf/wallclock.h> // Wallclock device config
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#include <cyg/infra/cyg_type.h> // Common type definitions and support
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#include <cyg/infra/cyg_type.h> // Common type definitions and support
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#include <cyg/hal/drv_api.h> // Driver API
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#include <cyg/hal/drv_api.h> // Driver API
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#include <cyg/io/wallclock.hxx> // The WallClock API
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#include <cyg/io/wallclock.hxx> // The WallClock API
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Local static variables
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// Local static variables
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static Cyg_WallClock wallclock_instance CYGBLD_ATTRIB_INIT_AFTER( CYG_INIT_CLOCK );
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static Cyg_WallClock wallclock_instance CYGBLD_ATTRIB_INIT_AFTER( CYG_INIT_CLOCK );
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#ifndef CYGSEM_WALLCLOCK_SET_GET_MODE
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#ifndef CYGSEM_WALLCLOCK_SET_GET_MODE
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static cyg_uint32 epoch_ticks;
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static cyg_uint32 epoch_ticks;
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static cyg_uint32 epoch_time_stamp;
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static cyg_uint32 epoch_time_stamp;
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#endif
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#endif
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Cyg_WallClock *Cyg_WallClock::wallclock;
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Cyg_WallClock *Cyg_WallClock::wallclock;
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Constructor
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// Constructor
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Cyg_WallClock::Cyg_WallClock()
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Cyg_WallClock::Cyg_WallClock()
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{
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{
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// install instance pointer
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// install instance pointer
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wallclock = &wallclock_instance;
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wallclock = &wallclock_instance;
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// Always allow low-level driver to initialize clock, even though it
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// Always allow low-level driver to initialize clock, even though it
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// may not be necessary for set-get mode.
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// may not be necessary for set-get mode.
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init_hw_seconds();
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init_hw_seconds();
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}
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}
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Returns the number of seconds elapsed since 1970-01-01 00:00:00.
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// Returns the number of seconds elapsed since 1970-01-01 00:00:00.
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// This may involve reading the hardware, so it may take anything up to
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// This may involve reading the hardware, so it may take anything up to
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// a second to complete.
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// a second to complete.
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cyg_uint32 Cyg_WallClock::get_current_time()
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cyg_uint32 Cyg_WallClock::get_current_time()
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{
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{
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cyg_uint32 res;
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cyg_uint32 res;
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cyg_drv_dsr_lock();
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cyg_drv_dsr_lock();
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#ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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#ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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res = get_hw_seconds();
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res = get_hw_seconds();
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#else
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#else
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res = epoch_time_stamp + get_hw_seconds() - epoch_ticks;
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res = epoch_time_stamp + get_hw_seconds() - epoch_ticks;
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#endif
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#endif
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cyg_drv_dsr_unlock();
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cyg_drv_dsr_unlock();
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return res;
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return res;
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}
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}
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
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// Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
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// This may involve reading or writing to the hardware, so it may take
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// This may involve reading or writing to the hardware, so it may take
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// anything up to a second to complete.
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// anything up to a second to complete.
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void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp )
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void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp )
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{
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{
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cyg_drv_dsr_lock();
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cyg_drv_dsr_lock();
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#ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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#ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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set_hw_seconds(time_stamp);
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set_hw_seconds(time_stamp);
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#else
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#else
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epoch_time_stamp = time_stamp;
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epoch_time_stamp = time_stamp;
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epoch_ticks = get_hw_seconds();
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epoch_ticks = get_hw_seconds();
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#endif
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#endif
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cyg_drv_dsr_unlock();
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cyg_drv_dsr_unlock();
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}
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}
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// End of devs/wallclock/wallclock.cxx
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// End of devs/wallclock/wallclock.cxx
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