cpu/pxa/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 <asm/arch/pxa-regs.h>
  31
  32 #ifdef CONFIG_USE_IRQ
  33 #error: interrupts not implemented yet
  34 #endif
  35
  36 int interrupt_init (void)
  37 {
  38         /* nothing happens here - we don't setup any IRQs */
  39         return (0);
  40 }
  41
  42 void reset_timer (void)
  43 {
  44         reset_timer_masked ();
  45 }
  46
  47 ulong get_timer (ulong base)
  48 {
  49         return get_timer_masked () - base;
  50 }
  51
  52 void set_timer (ulong t)
  53 {
  54         /* nop */
  55 }
  56
  57 void udelay (unsigned long usec)
  58 {
  59         udelay_masked (usec);
  60 }
  61
  62
  63 void reset_timer_masked (void)
  64 {
  65         OSCR = 0;
  66 }
  67
  68 ulong get_timer_masked (void)
  69 {
  70         return OSCR;
  71 }
  72
  73 void udelay_masked (unsigned long usec)
  74 {
  75         ulong tmo;
  76         ulong endtime;
  77         signed long diff;
  78
  79         if (usec >= 1000) {
  80                 tmo = usec / 1000;
  81                 tmo *= CONFIG_SYS_HZ;
  82                 tmo /= 1000;
  83         } else {
  84                 tmo = usec * CONFIG_SYS_HZ;
  85                 tmo /= (1000*1000);
  86         }
  87
  88         endtime = get_timer_masked () + tmo;
  89
  90         do {
  91                 ulong now = get_timer_masked ();
  92                 diff = endtime - now;
  93         } while (diff >= 0);
  94 }
  95
  96 /*
  97  * This function is derived from PowerPC code (read timebase as long long).
  98  * On ARM it just returns the timer value.
  99  */
 100 unsigned long long get_ticks(void)
 101 {
 102         return get_timer(0);
 103 }
 104
 105 /*
 106  * This function is derived from PowerPC code (timebase clock frequency).
 107  * On ARM it returns the number of timer ticks per second.
 108  */
 109 ulong get_tbclk (void)
 110 {
 111         ulong tbclk;
 112         tbclk = CONFIG_SYS_HZ;
 113         return tbclk;
 114 }