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
  37ulong get_timer (ulong base)
  38{
  39        return get_timer_masked ();
  40}
  41
  42void __udelay (unsigned long usec)
  43{
  44        udelay_masked (usec);
  45}
  46
  47ulong get_timer_masked (void)
  48{
  49        return OSCR;
  50}
  51
  52void udelay_masked (unsigned long usec)
  53{
  54        ulong tmo;
  55        ulong endtime;
  56        signed long diff;
  57
  58        if (usec >= 1000) {
  59                tmo = usec / 1000;
  60                tmo *= CONFIG_SYS_HZ;
  61                tmo /= 1000;
  62        } else {
  63                tmo = usec * CONFIG_SYS_HZ;
  64                tmo /= (1000*1000);
  65        }
  66
  67        endtime = get_timer_masked () + tmo;
  68
  69        do {
  70                ulong now = get_timer_masked ();
  71                diff = endtime - now;
  72        } while (diff >= 0);
  73}
  74
  75/*
  76 * This function is derived from PowerPC code (read timebase as long long).
  77 * On ARM it just returns the timer value.
  78 */
  79unsigned long long get_ticks(void)
  80{
  81        return get_timer(0);
  82}
  83
  84/*
  85 * This function is derived from PowerPC code (timebase clock frequency).
  86 * On ARM it returns the number of timer ticks per second.
  87 */
  88ulong get_tbclk (void)
  89{
  90        ulong tbclk;
  91
  92        tbclk = CONFIG_SYS_HZ;
  93        return tbclk;
  94}
  95