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//==========================================================================
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//
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// devs/watchdog/powerpc/mpc5xx/watchdog_mpc5xx.cxx
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//
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// Watchdog implementation for MPC5XX
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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) 1998, 1999, 2000, 2001, 2002 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): Bob Koninckx
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// Contributors: Bob Koninckx
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// Date: 2003-05-18
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// Purpose: Watchdog class implementation
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// Description: Contains an implementation of the Watchdog class for use
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// with the mpc5xx watchdog timer.
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include <pkgconf/system.h> // system configuration file
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#include <pkgconf/watchdog.h> // configuration for this package
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#include <cyg/infra/cyg_trac.h> // tracing macros
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#include <cyg/hal/hal_io.h> // IO register access
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#include <cyg/hal/hal_arch.h> // Register definitions
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#include <cyg/io/watchdog.hxx> // watchdog API
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// -------------------------------------------------------------------------
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// MPC5xx SYPCR register bit definitions
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#define MPC5XX_SYPCR_SWTC 0xffff0000
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#define MPC5XX_SYPCR_SWP 0x00000001
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#define MPC5XX_SYPCR_SWRI 0x00000002
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#define MPC5XX_SYPCR_SWE 0x00000004
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#define MPC5XX_SYPCR_SWF 0x00000008
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// -------------------------------------------------------------------------
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// Constructor
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void
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Cyg_Watchdog::init_hw(void)
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{
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CYG_REPORT_FUNCTION();
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cyg_uint32 sypcr;
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HAL_READ_UINT32(CYGARC_REG_IMM_SYPCR, sypcr);
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resolution = (sypcr & MPC5XX_SYPCR_SWTC) >> 16;
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if(sypcr & MPC5XX_SYPCR_SWP)
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resolution *= 2048;
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// Now we have it in ticks, convert to nanoseconds
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// This holds for a system clock of 40 Mhz (25 nanosecond ticks) which is normal
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// for the MPC5xx
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resolution *= 25;
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CYG_REPORT_RETURN();
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}
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// -------------------------------------------------------------------------
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// Start the watchdog running.
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// On powerpc, the watchdog is enabled by default. If the watchdog package
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// is present, board setup does not disable it, so, nothing special to be
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// done here.
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void
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Cyg_Watchdog::start(void)
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{
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CYG_REPORT_FUNCTION();
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CYG_REPORT_RETURN();
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}
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// -------------------------------------------------------------------------
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// Reset watchdog timer. This needs to be called regularly to prevent
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// the watchdog firing.
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void
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Cyg_Watchdog::reset()
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{
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CYG_REPORT_FUNCTION();
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cyg_uint16 swsr;
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swsr = 0x556c;
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HAL_WRITE_UINT16(CYGARC_REG_IMM_SWSR, swsr);
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swsr = 0xaa39;
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HAL_WRITE_UINT16(CYGARC_REG_IMM_SWSR, swsr);
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CYG_REPORT_RETURN();
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}
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// -------------------------------------------------------------------------
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// EOF watchdog_mpc5xx.cxx
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