According to the PPC reference implementation the udelay() function is responsible for resetting the watchdog timer as frequently as needed. Most other architectures do not meet that requirement, so long-running operations might result in a watchdog reset. This patch adds a generic udelay() function which takes care of resetting the watchdog before calling an architecture-specific __udelay(). Signed-off-by: Ingo van Lil <inguin@gmx.de>master
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/*
|
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* (C) Copyright 2000-2009 |
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License 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 this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#include <watchdog.h> |
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#ifndef CONFIG_WD_PERIOD |
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# define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default*/ |
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#endif |
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/* ------------------------------------------------------------------------- */ |
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void udelay(unsigned long usec) |
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{ |
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ulong kv; |
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do { |
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WATCHDOG_RESET(); |
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kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec; |
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__udelay (kv); |
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usec -= kv; |
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} while(usec); |
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} |
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