lib_nios/time.c

   1 /*
   2  * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
   3  * Scott McNutt <smcnutt@psyent.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <watchdog.h>
  26
  27
  28 extern void dly_clks( unsigned long ticks );
  29
  30 void udelay(unsigned long usec)
  31 {
  32         /* The Nios core doesn't have a timebase, so we do our
  33          * best for now and call a low-level loop that counts
  34          * cpu clocks.
  35          */
  36         unsigned long cnt = (CONFIG_SYS_CLK_FREQ/1000000) * usec;
  37         WATCHDOG_RESET ();      /* trigger watchdog if needed */
  38         dly_clks (cnt);
  39 }