cpu/sa1100/interrupts.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 interrupt_init (void)
  33 {
  34         /* nothing happens here - we don't setup any IRQs */
  35         return (0);
  36 }
  37
  38 void reset_timer (void)
  39 {
  40         reset_timer_masked ();
  41 }
  42
  43 ulong get_timer (ulong base)
  44 {
  45         return get_timer_masked ();
  46 }
  47
  48 void set_timer (ulong t)
  49 {
  50         /* nop */
  51 }
  52
  53 void udelay (unsigned long usec)
  54 {
  55         udelay_masked (usec);
  56 }
  57
  58
  59 void reset_timer_masked (void)
  60 {
  61         OSCR = 0;
  62 }
  63
  64 ulong get_timer_masked (void)
  65 {
  66         return OSCR;
  67 }
  68
  69 void udelay_masked (unsigned long usec)
  70 {
  71         ulong tmo;
  72         ulong endtime;
  73         signed long diff;
  74
  75         if (usec >= 1000) {
  76                 tmo = usec / 1000;
  77                 tmo *= CONFIG_SYS_HZ;
  78                 tmo /= 1000;
  79         } else {
  80                 tmo = usec * CONFIG_SYS_HZ;
  81                 tmo /= (1000*1000);
  82         }
  83
  84         endtime = get_timer_masked () + tmo;
  85
  86         do {
  87                 ulong now = get_timer_masked ();
  88                 diff = endtime - now;
  89         } while (diff >= 0);
  90 }
  91
  92 /*
  93  * This function is derived from PowerPC code (read timebase as long long).
  94  * On ARM it just returns the timer value.
  95  */
  96 unsigned long long get_ticks(void)
  97 {
  98         return get_timer(0);
  99 }
 100
 101 /*
 102  * This function is derived from PowerPC code (timebase clock frequency).
 103  * On ARM it returns the number of timer ticks per second.
 104  */
 105 ulong get_tbclk (void)
 106 {
 107         ulong tbclk;
 108
 109         tbclk = CONFIG_SYS_HZ;
 110         return tbclk;
 111 }