lib_sparc/time.c

   1 /*
   2  * (C) Copyright 2000, 2001
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2007
   6  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28
  29 /* Implemented by SPARC CPUs */
  30 extern void cpu_wait_ticks(unsigned long ticks);
  31 extern unsigned long cpu_usec2ticks(unsigned long usec);
  32 extern unsigned long cpu_ticks2usec(unsigned long ticks);
  33
  34 /* ------------------------------------------------------------------------- */
  35
  36 void wait_ticks(unsigned long ticks)
  37 {
  38         cpu_wait_ticks(ticks);
  39 }
  40
  41 /*
  42  * This function is intended for SHORT delays only.
  43  */
  44 unsigned long usec2ticks(unsigned long usec)
  45 {
  46         return cpu_usec2ticks(usec);
  47 }
  48
  49 /* ------------------------------------------------------------------------- */
  50
  51 /*
  52  * We implement the delay by converting the delay (the number of
  53  * microseconds to wait) into a number of time base ticks; then we
  54  * watch the time base until it has incremented by that amount.
  55  */
  56 void udelay(unsigned long usec)
  57 {
  58         ulong ticks = usec2ticks(usec);
  59
  60         wait_ticks(ticks);
  61 }
  62
  63 /* ------------------------------------------------------------------------- */
  64
  65 unsigned long ticks2usec(unsigned long ticks)
  66 {
  67         return cpu_ticks2usec(ticks);
  68 }
  69
  70 /* ------------------------------------------------------------------------- */
  71
  72 int init_timebase(void)
  73 {
  74
  75         return (0);
  76 }
  77
  78 /* ------------------------------------------------------------------------- */