at91_reset.c

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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 

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