/* * (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> static inline void mips_compare_set(u32 v) { asm volatile ("mtc0 %0, $11" : : "r" (v)); } static inline void mips_count_set(u32 v) { asm volatile ("mtc0 %0, $9" : : "r" (v)); } static inline u32 mips_count_get(void) { u32 count; asm volatile ("mfc0 %0, $9" : "=r" (count) :); return count; } /* * timer without interrupts */ int timer_init(void) { mips_compare_set(0); mips_count_set(0); return 0; } void reset_timer(void) { mips_count_set(0); } ulong get_timer(ulong base) { return mips_count_get() - base; } void set_timer(ulong t) { mips_count_set(t); } void udelay (unsigned long usec) { ulong tmo; ulong start = get_timer(0); tmo = usec * (CFG_HZ / 1000000); while ((ulong)((mips_count_get() - start)) < tmo) /*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 mips_count_get(); } /* * 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 CFG_HZ; }