LXR uboot/arch/microblaze/cpu/timer.c

   1/*
   2 * (C) Copyright 2007 Michal Simek
   3 *
   4 * Michal  SIMEK <monstr@monstr.eu>
   5 *
   6 * See file CREDITS for list of people who contributed to this
   7 * project.
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public License as
  11 * published by the Free Software Foundation; either version 2 of
  12 * the License, or (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22 * MA 02111-1307 USA
  23 */
  24
  25#include <common.h>
  26#include <asm/microblaze_timer.h>
  27#include <asm/microblaze_intc.h>
  28
  29volatile int timestamp = 0;
  30
  31void reset_timer (void)
  32{
  33        timestamp = 0;
  34}
  35
  36#ifdef CONFIG_SYS_TIMER_0
  37ulong get_timer (ulong base)
  38{
  39        return (timestamp - base);
  40}
  41#else
  42ulong get_timer (ulong base)
  43{
  44        return (timestamp++ - base);
  45}
  46#endif
  47
  48void set_timer (ulong t)
  49{
  50        timestamp = t;
  51}
  52
  53#ifdef CONFIG_SYS_INTC_0
  54#ifdef CONFIG_SYS_TIMER_0
  55microblaze_timer_t *tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR);
  56
  57void timer_isr (void *arg)
  58{
  59        timestamp++;
  60        tmr->control = tmr->control | TIMER_INTERRUPT;
  61}
  62
  63int timer_init (void)
  64{
  65        tmr->loadreg = CONFIG_SYS_TIMER_0_PRELOAD;
  66        tmr->control = TIMER_INTERRUPT | TIMER_RESET;
  67        tmr->control =
  68            TIMER_ENABLE | TIMER_ENABLE_INTR | TIMER_RELOAD | TIMER_DOWN_COUNT;
  69        reset_timer ();
  70        install_interrupt_handler (CONFIG_SYS_TIMER_0_IRQ, timer_isr, (void *)tmr);
  71        return 0;
  72}
  73#endif
  74#endif
  75