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
  32 int timer_init (void)
  33 {
  34         return 0;
  35 }
  36
  37 void reset_timer (void)
  38 {
  39         reset_timer_masked ();
  40 }
  41
  42 ulong get_timer (ulong base)
  43 {
  44         return get_timer_masked ();
  45 }
  46
  47 void set_timer (ulong t)
  48 {
  49         /* nop */
  50 }
  51
  52 void udelay (unsigned long usec)
  53 {
  54         udelay_masked (usec);
  55 }
  56
  57
  58 void reset_timer_masked (void)
  59 {
  60         OSCR = 0;
  61 }
  62
  63 ulong get_timer_masked (void)
  64 {
  65         return OSCR;
  66 }
  67
  68 void 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  */
  95 unsigned 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  */
 104 ulong get_tbclk (void)
 105 {
 106         ulong tbclk;
 107
 108         tbclk = CONFIG_SYS_HZ;
 109         return tbclk;
 110 }