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/*
* (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;
}