58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "at91rm9200.h"
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#include "lib.h"
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/*
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* void reset()
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*
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* Forces a reset of the system. Uses watchdog timer of '1', which
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* corresponds to 128 / SLCK seconds (SLCK is 32,768 Hz, so 128/32768 is
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* 1 / 256 ~= 5.4ms
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*/
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void
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reset(void)
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{
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// The following should effect a reset.
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AT91C_BASE_ST->ST_WDMR = 1 | AT91C_ST_RSTEN;
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AT91C_BASE_ST->ST_CR = AT91C_ST_WDRST;
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}
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/*
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* void start_wdog()
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*
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* Starts a watchdog timer. We force the boot process to get to the point
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* it can kick the watch dog part of the ST part for the OS's driver.
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*/
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void
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start_wdog(int n)
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{
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// The following should effect a reset after N seconds.
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AT91C_BASE_ST->ST_WDMR = (n * (32768 / 128)) | AT91C_ST_RSTEN;
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AT91C_BASE_ST->ST_CR = AT91C_ST_WDRST;
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}
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