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https://github.com/brain-hackers/u-boot-brain
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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>
142 lines
2.7 KiB
C
142 lines
2.7 KiB
C
/*
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* (C) Copyright 2009
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* Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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*
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* (C) Copyright 2007-2008
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* Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
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*
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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 <div64.h>
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#include <asm/processor.h>
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#include <asm/clk.h>
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#include <asm/io.h>
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#define TMU_MAX_COUNTER (~0UL)
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static ulong timer_freq;
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static inline unsigned long long tick_to_time(unsigned long long tick)
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{
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tick *= CONFIG_SYS_HZ;
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do_div(tick, timer_freq);
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return tick;
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}
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static inline unsigned long long usec_to_tick(unsigned long long usec)
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{
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usec *= timer_freq;
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do_div(usec, 1000000);
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return usec;
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}
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static void tmu_timer_start (unsigned int timer)
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{
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if (timer > 2)
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return;
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writeb(readb(TSTR) | (1 << timer), TSTR);
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}
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static void tmu_timer_stop (unsigned int timer)
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{
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if (timer > 2)
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return;
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writeb(readb(TSTR) & ~(1 << timer), TSTR);
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}
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int timer_init (void)
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{
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/* Divide clock by CONFIG_SYS_TMU_CLK_DIV */
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u16 bit = 0;
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switch (CONFIG_SYS_TMU_CLK_DIV) {
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case 1024:
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bit = 4;
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break;
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case 256:
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bit = 3;
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break;
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case 64:
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bit = 2;
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break;
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case 16:
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bit = 1;
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break;
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case 4:
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default:
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break;
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}
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writew(readw(TCR0) | bit, TCR0);
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/* Calc clock rate */
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timer_freq = get_tmu0_clk_rate() >> ((bit + 1) * 2);
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tmu_timer_stop(0);
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tmu_timer_start(0);
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return 0;
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}
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unsigned long long get_ticks (void)
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{
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return 0 - readl(TCNT0);
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}
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void __udelay (unsigned long usec)
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{
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unsigned long long tmp;
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ulong tmo;
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tmo = usec_to_tick(usec);
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tmp = get_ticks() + tmo; /* get current timestamp */
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while (get_ticks() < tmp) /* loop till event */
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/*NOP*/;
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}
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unsigned long get_timer (unsigned long base)
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{
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/* return msec */
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return tick_to_time(get_ticks()) - base;
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}
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void set_timer (unsigned long t)
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{
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writel((0 - t), TCNT0);
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}
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void reset_timer (void)
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{
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tmu_timer_stop(0);
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set_timer (0);
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tmu_timer_start(0);
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}
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unsigned long get_tbclk (void)
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{
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return timer_freq;
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}
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