navienginebsp/naviengine_assp/watchdog.cpp
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     1 /*
       
     2 * Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
       
     3 * All rights reserved.
       
     4 * This component and the accompanying materials are made available
       
     5 * under the terms of "Eclipse Public License v1.0"
       
     6 * which accompanies this distribution, and is available
       
     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
       
     8 *
       
     9 * Initial Contributors:
       
    10 * Nokia Corporation - initial contribution.
       
    11 *
       
    12 * Contributors:
       
    13 *
       
    14 * Description:  
       
    15 * naviengine_assp\naviengine.cpp
       
    16 *
       
    17 */
       
    18 
       
    19 
       
    20 
       
    21 #include <naviengine_priv.h>
       
    22 #include "watchdog.h"
       
    23 
       
    24 const TInt KWatchdogTimeoutSecs = 5; // the period, in seconds, that the watchdog timer will expire
       
    25 
       
    26 //
       
    27 // Pat the watchdog to prevent the board from resetting
       
    28 //
       
    29 void TNaviEngineWatchdog::WatchdogTimer(TAny* aPtr)
       
    30 	{
       
    31 	__KTRACE_OPT(KHARDWARE, Kern::Printf("watchdogTimer expired"));
       
    32 	//Kern::Printf("watchdogTimer expired");
       
    33 
       
    34 	TNaviEngineWatchdog *pDog = (TNaviEngineWatchdog *) aPtr;
       
    35 
       
    36 	// Pat the Dog now to give us the full period to respond with the timer
       
    37 	AsspRegister::Write32(KHwWatchdog_WDTINT, 1);
       
    38 
       
    39 	// Now queue the timer again so that we can pat it next time around
       
    40 	pDog->iWatchdogTimer.Again(NKern::TimerTicks(pDog->iWatchdogTimerPeriodMs));
       
    41 	}
       
    42 
       
    43 
       
    44 
       
    45 //
       
    46 // Constructor
       
    47 //
       
    48 // We only really need the constructor to create the timer instance.
       
    49 //
       
    50 TNaviEngineWatchdog::TNaviEngineWatchdog() :
       
    51 	iWatchdogTimer(WatchdogTimer,this)
       
    52 	{
       
    53 	}
       
    54 
       
    55 
       
    56 
       
    57 
       
    58 // Destructor should never be called
       
    59 TNaviEngineWatchdog::~TNaviEngineWatchdog()
       
    60 	{
       
    61 	__crash();
       
    62 	}
       
    63 
       
    64 
       
    65 
       
    66 
       
    67 /**
       
    68 Perform hardware-dependent initialisation
       
    69 
       
    70 Called by platform independent layer
       
    71 */
       
    72 TInt TNaviEngineWatchdog::Create()
       
    73 	{
       
    74 	__KTRACE_OPT(KEXTENSION,Kern::Printf("TNaviEngineWatchdog::Create"));
       
    75 	//Kern::Printf("TNaviEngineWatchdog::Create");
       
    76 	SetTimer(KWatchdogTimeoutSecs);
       
    77 	return KErrNone;
       
    78 	}
       
    79 
       
    80 
       
    81 //
       
    82 // Enable/disable the external watchdog timer (eWDT).
       
    83 //
       
    84 void TNaviEngineWatchdog::SetTimer(TUint aTimeoutInSeconds)
       
    85 	{
       
    86 	__KTRACE_OPT(KHARDWARE, Kern::Printf(">TNaviEngine::SetWatchdogTimer timeout=%d seconds", aTimeoutInSeconds));
       
    87 	//Kern::Printf(">TNaviEngine::SetWatchdogTimer timeout=%d seconds", aTimeoutInSeconds);
       
    88 
       
    89 	// Disable eWDT
       
    90 	AsspRegister::Write32(KHwWatchdog_WDTCNT, 0);
       
    91 
       
    92 	// If only disabling then we're done
       
    93 	if (aTimeoutInSeconds > 0)
       
    94 		{
       
    95 		// Set the WTD period to something very near the required number 
       
    96 		// of seconds (this assumes a 66.666MHz clock)
       
    97 		AsspRegister::Write32(KHwWatchdog_WDTSET, (aTimeoutInSeconds*63)<<20);
       
    98 		AsspRegister::Write32(KHwWatchdog_WDTTIM, 0);
       
    99 
       
   100 		// Enable eWDT - start counting
       
   101 		AsspRegister::Write32(KHwWatchdog_WDTCNT, 1);
       
   102 
       
   103 		// Pat the Dog now to give us the full period to respond with the timer
       
   104 		AsspRegister::Write32(KHwWatchdog_WDTINT, 1);
       
   105 
       
   106 		// We have to decide how often to pat the dog, in seconds.
       
   107 		// The board will flag a warning after aTimeoutInSeconds, and reset after a further aTimeoutInSeconds.
       
   108 		// So we have to fire the watchdog at least every aTimeoutInSeconds to prevent the warning
       
   109 		// I've decided that we'll fire 500ms before the alarm to be sure we've patted the dog in time
       
   110 		__KTRACE_OPT(KHARDWARE, Kern::Printf("TNaviEngine::SetWatchdogTimer kicking off a timer..."));
       
   111 		//Kern::Printf("TNaviEngine::SetWatchdogTimer kicking off a timer...");
       
   112 
       
   113 		iWatchdogTimerPeriodMs = ((aTimeoutInSeconds * 1000) - 500);
       
   114 		iWatchdogTimer.OneShot(NKern::TimerTicks(iWatchdogTimerPeriodMs));
       
   115 		}
       
   116 	}
       
   117 
       
   118 
       
   119 DECLARE_STANDARD_EXTENSION()
       
   120 	{
       
   121 	__KTRACE_OPT(KEXTENSION,Kern::Printf("Watchdog: Starting timer service"));
       
   122 	//Kern::Printf("Watchdog: Starting timer service");
       
   123 
       
   124 	// create the watchdog handler
       
   125 	TInt r=KErrNoMemory;
       
   126 	TNaviEngineWatchdog* pH=new TNaviEngineWatchdog;
       
   127 	if (pH)
       
   128 		{
       
   129 		r=pH->Create();
       
   130 		}
       
   131 
       
   132 	__KTRACE_OPT(KEXTENSION,Kern::Printf("Watchdog: Returns %d",r));
       
   133 	//Kern::Printf("Watchdog: Returns %d",r);
       
   134 	return r;
       
   135 	}
       
   136