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100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
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/*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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static inline void mips_compare_set(u32 v)
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{
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asm volatile ("mtc0 %0, $11" : : "r" (v));
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}
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static inline void mips_count_set(u32 v)
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{
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asm volatile ("mtc0 %0, $9" : : "r" (v));
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}
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static inline u32 mips_count_get(void)
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{
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u32 count;
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asm volatile ("mfc0 %0, $9" : "=r" (count) :);
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return count;
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}
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/*
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* timer without interrupts
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*/
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int timer_init(void)
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{
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mips_compare_set(0);
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mips_count_set(0);
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return 0;
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}
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void reset_timer(void)
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{
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mips_count_set(0);
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}
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ulong get_timer(ulong base)
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{
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return mips_count_get() - base;
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}
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void set_timer(ulong t)
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{
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mips_count_set(t);
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}
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void udelay (unsigned long usec)
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{
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ulong tmo;
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ulong start = get_timer(0);
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tmo = usec * (CFG_HZ / 1000000);
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while ((ulong)((mips_count_get() - start)) < tmo)
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/*NOP*/;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On MIPS it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return mips_count_get();
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On MIPS it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return CFG_HZ;
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}
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