/* * (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 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> * * 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> #if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) #include <arm920t.h> #if defined(CONFIG_S3C2400) #include <s3c2400.h> #elif defined(CONFIG_S3C2410) #include <s3c2410.h> #endif int timer_load_val = 0; /* macro to read the 16 bit timer */ static inline ulong READ_TIMER(void) { S3C24X0_TIMERS * const timers = S3C24X0_GetBase_TIMERS(); return (timers->TCNTO4 & 0xffff); } static ulong timestamp; static ulong lastdec; int interrupt_init (void) { S3C24X0_TIMERS * const timers = S3C24X0_GetBase_TIMERS(); /* use PWM Timer 4 because it has no output */ /* prescaler for Timer 4 is 16 */ timers->TCFG0 = 0x0f00; if (timer_load_val == 0) { /* * for 10 ms clock period @ PCLK with 4 bit divider = 1/2 * (default) and prescaler = 16. Should be 10390 * @33.25MHz and 15625 @ 50 MHz */ timer_load_val = get_PCLK()/(2 * 16 * 100); } /* load value for 10 ms timeout */ lastdec = timers->TCNTB4 = timer_load_val; /* auto load, manual update of Timer 4 */ timers->TCON = (timers->TCON & ~0x0700000) | 0x600000; /* auto load, start Timer 4 */ timers->TCON = (timers->TCON & ~0x0700000) | 0x500000; timestamp = 0; 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; } void udelay (unsigned long usec) { ulong tmo; ulong start = get_timer(0); tmo = usec / 1000; tmo *= (timer_load_val * 100); tmo /= 1000; while ((ulong)(get_timer_masked () - start) < tmo) /*NOP*/; } void reset_timer_masked (void) { /* reset time */ lastdec = READ_TIMER(); timestamp = 0; } ulong get_timer_masked (void) { ulong now = READ_TIMER(); if (lastdec >= now) { /* normal mode */ timestamp += lastdec - now; } else { /* we have an overflow ... */ timestamp += lastdec + timer_load_val - now; } lastdec = now; return timestamp; } void udelay_masked (unsigned long usec) { ulong tmo; ulong endtime; signed long diff; if (usec >= 1000) { tmo = usec / 1000; tmo *= (timer_load_val * 100); tmo /= 1000; } else { tmo = usec * (timer_load_val * 100); tmo /= (1000*1000); } endtime = get_timer_masked () + tmo; do { ulong now = get_timer_masked (); diff = endtime - now; } while (diff >= 0); } /* * 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; #if defined(CONFIG_SMDK2400) || defined(CONFIG_TRAB) tbclk = timer_load_val * 100; #elif defined(CONFIG_SBC2410X) || \ defined(CONFIG_SMDK2410) || \ defined(CONFIG_VCMA9) tbclk = CFG_HZ; #else # error "tbclk not configured" #endif return tbclk; } /* * reset the cpu by setting up the watchdog timer and let him time out */ void reset_cpu (ulong ignored) { volatile S3C24X0_WATCHDOG * watchdog; #ifdef CONFIG_TRAB extern void disable_vfd (void); disable_vfd(); #endif watchdog = S3C24X0_GetBase_WATCHDOG(); /* Disable watchdog */ watchdog->WTCON = 0x0000; /* Initialize watchdog timer count register */ watchdog->WTCNT = 0x0001; /* Enable watchdog timer; assert reset at timer timeout */ watchdog->WTCON = 0x0021; while(1); /* loop forever and wait for reset to happen */ /*NOTREACHED*/ } #endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */