lib_sh/time.c

   1 /*
   2  * Copyright (c) 2007
   3  * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
   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 <asm/processer.h>
  26
  27 static void tmu_timer_start (unsigned int timer)
  28 {
  29         if (timer > 2)
  30                 return;
  31
  32         *((volatile unsigned char *) TSTR0) |= (1 << timer);
  33 }
  34
  35 int timer_init (void)
  36 {
  37         *(volatile u16 *)TCR0 = 0;
  38
  39         tmu_timer_start (0);
  40         return 0;
  41 }
  42
  43 unsigned long long get_ticks (void)
  44 {
  45         return (0 - *((volatile unsigned int *) TCNT0));
  46 }
  47
  48 unsigned long get_timer (unsigned long base)
  49 {
  50         return ((0 - *((volatile unsigned int *) TCNT0)) - base);
  51 }
  52
  53 void set_timer (unsigned long t)
  54 {
  55         *((volatile unsigned int *) TCNT0) = (0 - t);
  56 }
  57
  58 void reset_timer (void)
  59 {
  60         set_timer (0);
  61 }
  62
  63 void udelay (unsigned long usec)
  64 {
  65         unsigned int start = get_timer (0);
  66         unsigned int end = start + (usec * ((CFG_HZ + 500000) / 1000000));
  67
  68         while (get_timer (0) < end)
  69                 continue;
  70 }
  71
  72 unsigned long get_tbclk (void)
  73 {
  74         return CFG_HZ;
  75 }