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3eb90bad65
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>
99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/*
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* (C) Copyright 2003
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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 <asm/mipsregs.h>
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static unsigned long timestamp;
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/* how many counter cycles in a jiffy */
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#define CYCLES_PER_JIFFY (CONFIG_SYS_MIPS_TIMER_FREQ + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ
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/*
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* timer without interrupts
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*/
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int timer_init(void)
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{
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/* Set up the timer for the first expiration. */
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timestamp = 0;
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write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY);
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return 0;
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}
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void reset_timer(void)
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{
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timestamp = 0;
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write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY);
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}
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ulong get_timer(ulong base)
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{
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unsigned int count;
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unsigned int expirelo = read_c0_compare();
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/* Check to see if we have missed any timestamps. */
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count = read_c0_count();
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while ((count - expirelo) < 0x7fffffff) {
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expirelo += CYCLES_PER_JIFFY;
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timestamp++;
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}
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write_c0_compare(expirelo);
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return (timestamp - base);
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}
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void set_timer(ulong t)
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{
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timestamp = t;
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write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY);
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}
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void __udelay(unsigned long usec)
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{
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unsigned int tmo;
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tmo = read_c0_count() + (usec * (CONFIG_SYS_MIPS_TIMER_FREQ / 1000000));
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while ((tmo - read_c0_count()) < 0x7fffffff)
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/*NOP*/;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On MIPS it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On MIPS it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return CONFIG_SYS_HZ;
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}
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