00001 /* 00002 * Copyright 2008 by egnite GmbH 00003 * 00004 * Redistribution and use in source and binary forms, with or without 00005 * modification, are permitted provided that the following conditions 00006 * are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the copyright holders nor the names of 00014 * contributors may be used to endorse or promote products derived 00015 * from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00018 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00019 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00020 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 00021 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00022 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00023 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 00024 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 00025 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00026 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00027 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00028 * SUCH DAMAGE. 00029 * 00030 * For additional information see http://www.ethernut.de/ 00031 */ 00032 00042 #include <arch/arm.h> 00043 #include <dev/reset.h> 00044 00049 00053 void At91Reset(void) 00054 { 00055 #if defined(RSTC_PROCRST) 00056 /* Use reset controller if available. */ 00057 outr(RSTC_CR, RSTC_KEY | RSTC_EXTRST | RSTC_PERRST | RSTC_PROCRST); 00058 #else 00059 /* Otherwise use the watchdog. */ 00060 if (At91WatchDogStart(1, 0)) { 00061 for (;;); 00062 } 00063 #endif 00064 } 00065 00066 int At91ResetCause(void) 00067 { 00068 int rc = NUT_RSTTYP_UNKNOWN; 00069 00070 #if defined(RSTC_SR) 00071 switch (inr(RSTC_SR) & RSTC_RSTTYP) { 00072 case RSTC_RSTTYP_POWERUP: 00073 rc = NUT_RSTTYP_POWERUP; 00074 break; 00075 case RSTC_RSTTYP_WATCHDOG: 00076 rc = NUT_RSTTYP_WATCHDOG; 00077 break; 00078 case RSTC_RSTTYP_SOFTWARE: 00079 rc = NUT_RSTTYP_SOFTWARE; 00080 break; 00081 case RSTC_RSTTYP_USER: 00082 rc = NUT_RSTTYP_EXTERNAL; 00083 break; 00084 case RSTC_RSTTYP_BROWNOUT: 00085 rc = NUT_RSTTYP_BROWNOUT; 00086 break; 00087 } 00088 #endif 00089 return rc; 00090 } 00091