/* * (C) Copyright 2004 * DAVE Srl * http://www.dave-tech.it * http://www.wawnet.biz * mailto:info@wawnet.biz * * 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 <asm/hardware.h> /* we always count down the max. */ #define TIMER_LOAD_VAL 0xffff /* macro to read the 16 bit timer */ #define READ_TIMER (TCNTO1 & 0xffff) #ifdef CONFIG_USE_IRQ #error CONFIG_USE_IRQ NOT supported #endif static ulong timestamp; static ulong lastdec; int timer_init (void) { TCFG0 = 0x000000E9; TCFG1 = 0x00000004; TCON = 0x00000900; TCNTB1 = TIMER_LOAD_VAL; TCMPB1 = 0; TCON = 0x00000B00; TCON = 0x00000900; lastdec = TCNTB1 = TIMER_LOAD_VAL; 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; tmo = usec / 1000; tmo *= CONFIG_SYS_HZ; tmo /= 8; tmo += get_timer (0); while (get_timer_masked () < 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 *= CONFIG_SYS_HZ; tmo /= 8; } else { tmo = usec * CONFIG_SYS_HZ; tmo /= (1000*8); } endtime = get_timer(0) + tmo; do { ulong now = get_timer_masked (); diff = endtime - now; } while (diff >= 0); }