text: /*
   * (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;
  }
  