/* * (C) Copyright 2003 * Texas Instruments <www.ti.com> * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Marius Groeger <mgroeger@sysgo.de> * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Alex Zuepke <azu@sysgo.de> * * (C) Copyright 2002-2004 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> * * (C) Copyright 2004 * Philippe Robin, ARM Ltd. <philippe.robin@arm.com> * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <arm946es.h> #define TIMER_LOAD_VAL 0xffffffff extern void reset_cpu(ulong addr); #ifdef CONFIG_INTEGRATOR /* Timer functionality supplied by Integrator board (AP or CP) */ #else static ulong timestamp; static ulong lastdec; /* nothing really to do with interrupts, just starts up a counter. */ int interrupt_init (void) { /* init the timestamp and lastdec value */ reset_timer_masked(); return (0); } /* * timer without interrupts */ void reset_timer (void) { reset_timer_masked (); } ulong get_timer (ulong base) { return get_timer_masked () - base; } void set_timer (ulong t) { timestamp = t; } /* delay x useconds AND perserve advance timstamp value */ void udelay(unsigned long usec) { udelay_masked(usec); } void reset_timer_masked (void) { /* reset time */ lastdec = READ_TIMER; /* capure current decrementer value time */ timestamp = 0; /* start "advancing" time stamp from 0 */ } ulong get_timer_raw (void) { ulong now = READ_TIMER; /* current tick value */ if (lastdec >= now) { /* normal mode (non roll) */ /* normal mode */ timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ } else { /* we have overflow of the count down timer */ /* nts = ts + ld + (TLV - now) * ts=old stamp, ld=time that passed before passing through -1 * (TLV-now) amount of time after passing though -1 * nts = new "advancing time stamp"...it could also roll and cause problems. */ timestamp += lastdec + TIMER_LOAD_VAL - now; } lastdec = now; return timestamp; } ulong get_timer_masked (void) { return get_timer_raw() / TIMER_LOAD_VAL; } /* waits specified delay value and resets timestamp */ void udelay_masked (unsigned long usec) { ulong tmo; if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ tmo *= CFG_HZ_CLOCK; /* find number of "ticks" to wait to achieve target */ tmo /= 1000; /* finish normalize. */ }else{ /* else small number, don't kill it prior to HZ multiply */ tmo = usec * CFG_HZ_CLOCK; tmo /= (1000*1000); } reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */ while (get_timer_raw () < tmo) /* wait for time stamp to overtake tick number.*/ /*NOP*/; } /* * This function is derived from PowerPC code (read timebase as long long). * On ARM it just returns the timer value. */ unsigned long long get_ticks(void) { return get_timer(0); } /* * This function is derived from PowerPC code (timebase clock frequency). * On ARM it returns the number of timer ticks per second. */ ulong get_tbclk (void) { ulong tbclk; tbclk = CFG_HZ; return tbclk; } #endif /* CONFIG_INTEGRATOR */