/* * (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/mipsregs.h> static unsigned long timestamp; /* how many counter cycles in a jiffy */ #define CYCLES_PER_JIFFY (CONFIG_SYS_MIPS_TIMER_FREQ + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ /* * timer without interrupts */ int timer_init(void) { /* Set up the timer for the first expiration. */ timestamp = 0; write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); return 0; } void reset_timer(void) { timestamp = 0; write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); } ulong get_timer(ulong base) { unsigned int count; unsigned int expirelo = read_c0_compare(); /* Check to see if we have missed any timestamps. */ count = read_c0_count(); while ((count - expirelo) < 0x7fffffff) { expirelo += CYCLES_PER_JIFFY; timestamp++; } write_c0_compare(expirelo); return (timestamp - base); } void set_timer(ulong t) { timestamp = t; write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); } void udelay(unsigned long usec) { unsigned int tmo; tmo = read_c0_count() + (usec * (CONFIG_SYS_MIPS_TIMER_FREQ / 1000000)); while ((tmo - read_c0_count()) < 0x7fffffff) /*NOP*/; } /* * This function is derived from PowerPC code (read timebase as long long). * On MIPS 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 MIPS it returns the number of timer ticks per second. */ ulong get_tbclk(void) { return CONFIG_SYS_HZ; }