/* * (C) Copyright 2007 * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> * * (C) Copyright 2007 * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> * * (C) Copyright 2003 * Wolfgang Denk, DENX Software Engineering, wd@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> #include <asm/processor.h> #include <asm/io.h> #define TMU_MAX_COUNTER (~0UL) static void tmu_timer_start(unsigned int timer) { if (timer > 2) return; outb(inb(TSTR) | (1 << timer), TSTR); } static void tmu_timer_stop(unsigned int timer) { u8 val = inb(TSTR); if (timer > 2) return; outb(val & ~(1 << timer), TSTR); } int timer_init(void) { /* Divide clock by 4 */ outw(0, TCR0); tmu_timer_stop(0); tmu_timer_start(0); return 0; } /* In theory we should return a true 64bit value (ie something that doesn't overflow). However, we don't. Therefore if TMU runs at fastest rate of 6.75 MHz this value will wrap after u-boot has been running for approx 10 minutes. */ unsigned long long get_ticks(void) { return (0 - inl(TCNT0)); } unsigned long get_timer(unsigned long base) { return ((0 - inl(TCNT0)) - base); } void set_timer(unsigned long t) { outl(0 - t, TCNT0); } void reset_timer(void) { tmu_timer_stop(0); set_timer(0); tmu_timer_start(0); } void udelay(unsigned long usec) { unsigned int start = get_timer(0); unsigned int end = start + (usec * ((CFG_HZ + 500000) / 1000000)); while (get_timer(0) < end) continue; } unsigned long get_tbclk(void) { return CFG_HZ; }