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https://github.com/AsahiLinux/u-boot
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158 lines
4 KiB
C
158 lines
4 KiB
C
/*
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* (C) Copyright 2003
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* Texas Instruments <www.ti.com>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002-2004
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* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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*
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* (C) Copyright 2004
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* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
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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 <arm946es.h>
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#define TIMER_LOAD_VAL 0xffffffff
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extern void reset_cpu(ulong addr);
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#ifdef CONFIG_INTEGRATOR
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/* Timer functionality supplied by Integrator board (AP or CP) */
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#else
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static ulong timestamp;
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static ulong lastdec;
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/* nothing really to do with interrupts, just starts up a counter. */
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int interrupt_init (void)
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{
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/* init the timestamp and lastdec value */
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reset_timer_masked();
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return (0);
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}
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/*
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* timer without interrupts
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*/
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void reset_timer (void)
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{
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reset_timer_masked ();
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}
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ulong get_timer (ulong base)
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{
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return get_timer_masked () - 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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}
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/* delay x useconds AND perserve advance timstamp value */
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void udelay(unsigned long usec)
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{
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udelay_masked(usec);
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}
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void reset_timer_masked (void)
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{
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/* reset time */
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lastdec = READ_TIMER; /* capure current decrementer value time */
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timestamp = 0; /* start "advancing" time stamp from 0 */
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}
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ulong get_timer_raw (void)
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{
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ulong now = READ_TIMER; /* current tick value */
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if (lastdec >= now) { /* normal mode (non roll) */
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/* normal mode */
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timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
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} else { /* we have overflow of the count down timer */
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/* nts = ts + ld + (TLV - now)
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* ts=old stamp, ld=time that passed before passing through -1
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* (TLV-now) amount of time after passing though -1
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* nts = new "advancing time stamp"...it could also roll and cause problems.
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*/
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timestamp += lastdec + TIMER_LOAD_VAL - now;
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}
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lastdec = now;
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return timestamp;
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}
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ulong get_timer_masked (void)
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{
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return get_timer_raw() / TIMER_LOAD_VAL;
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}
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/* waits specified delay value and resets timestamp */
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void udelay_masked (unsigned long usec)
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{
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ulong tmo;
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if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
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tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
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tmo *= CONFIG_SYS_HZ_CLOCK; /* find number of "ticks" to wait to achieve target */
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tmo /= 1000; /* finish normalize. */
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}else{ /* else small number, don't kill it prior to HZ multiply */
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tmo = usec * CONFIG_SYS_HZ_CLOCK;
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tmo /= (1000*1000);
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}
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reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */
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while (get_timer_raw () < tmo) /* wait for time stamp to overtake tick number.*/
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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 ARM 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 ARM 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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ulong tbclk;
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tbclk = CONFIG_SYS_HZ;
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return tbclk;
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}
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#endif /* CONFIG_INTEGRATOR */
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