LXR uboot/arch/arm/cpu/sa1100/timer.c

   1/*
   2 * (C) Copyright 2002
   3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4 * Marius Groeger <mgroeger@sysgo.de>
   5 *
   6 * (C) Copyright 2002
   7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8 * Alex Zuepke <azu@sysgo.de>
   9 *
  10 * See file CREDITS for list of people who contributed to this
  11 * project.
  12 *
  13 * This program is free software; you can redistribute it and/or
  14 * modify it under the terms of the GNU General Public License as
  15 * published by the Free Software Foundation; either version 2 of
  16 * the License, or (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  26 * MA 02111-1307 USA
  27 */
  28
  29#include <common.h>
  30#include <SA-1100.h>
  31
  32int timer_init (void)
  33{
  34        return 0;
  35}
  36
  37void reset_timer (void)
  38{
  39        reset_timer_masked ();
  40}
  41
  42ulong get_timer (ulong base)
  43{
  44        return get_timer_masked ();
  45}
  46
  47void set_timer (ulong t)
  48{
  49        /* nop */
  50}
  51
  52void __udelay (unsigned long usec)
  53{
  54        udelay_masked (usec);
  55}
  56
  57
  58void reset_timer_masked (void)
  59{
  60        OSCR = 0;
  61}
  62
  63ulong get_timer_masked (void)
  64{
  65        return OSCR;
  66}
  67
  68void udelay_masked (unsigned long usec)
  69{
  70        ulong tmo;
  71        ulong endtime;
  72        signed long diff;
  73
  74        if (usec >= 1000) {
  75                tmo = usec / 1000;
  76                tmo *= CONFIG_SYS_HZ;
  77                tmo /= 1000;
  78        } else {
  79                tmo = usec * CONFIG_SYS_HZ;
  80                tmo /= (1000*1000);
  81        }
  82
  83        endtime = get_timer_masked () + tmo;
  84
  85        do {
  86                ulong now = get_timer_masked ();
  87                diff = endtime - now;
  88        } while (diff >= 0);
  89}
  90
  91/*
  92 * This function is derived from PowerPC code (read timebase as long long).
  93 * On ARM it just returns the timer value.
  94 */
  95unsigned long long get_ticks(void)
  96{
  97        return get_timer(0);
  98}
  99
 100/*
 101 * This function is derived from PowerPC code (timebase clock frequency).
 102 * On ARM it returns the number of timer ticks per second.
 103 */
 104ulong get_tbclk (void)
 105{
 106        ulong tbclk;
 107
 108        tbclk = CONFIG_SYS_HZ;
 109        return tbclk;
 110}
 111