firmware/target/arm/rk27xx/timer-rk27xx.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2011 by Marcin Bukat
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23
  24 #include "inttypes.h"
  25 #include "system.h"
  26 #include "timer.h"
  27
  28 void INT_TIMER1(void)
  29 {
  30     /* clear interrupt */
  31     TMR1CON &= ~(1<<2);
  32
  33     if (pfn_timer != NULL)
  34     {
  35         pfn_timer();
  36     }
  37 }
  38
  39 bool timer_set(long cycles, bool start)
  40 {
  41     /* optionally unregister any previously registered timer user */
  42     if (start)
  43     {
  44         if (pfn_unregister != NULL)
  45         {
  46             pfn_unregister();
  47             pfn_unregister = NULL;
  48         }
  49     }
  50
  51     TMR1LR = cycles;
  52     TMR1CON = (1<<7) | (1<<1); /* periodic, 1/1 */
  53
  54     /* unmask timer1 interrupt */
  55     INTC_IMR |= (1<<3);
  56
  57     /* enable timer1 interrupt */
  58     INTC_IECR |= (1<<3);
  59
  60     return true;
  61 }
  62
  63 bool timer_start(void)
  64 {
  65     TMR1CON |= (1 << 8);       /* timer1 enable */
  66
  67     return true;
  68 }
  69
  70 void timer_stop(void)
  71 {
  72     TMR1CON &= ~(1 << 8);       /* timer1 disable */
  73 }
  74