firmware/export/timer.h

   1 /***************************************************************************
   2 *             __________               __   ___.
   3 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7 *                     \/            \/     \/    \/            \/
   8 * $Id$
   9 *
  10 * Copyright (C) 2005 Jens Arnold
  11 *
  12 * All files in this archive are subject to the GNU General Public License.
  13 * See the file COPYING in the source tree root for full license agreement.
  14 *
  15 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16 * KIND, either express or implied.
  17 *
  18 ****************************************************************************/
  19
  20 #ifndef __TIMER_H__
  21 #define __TIMER_H__
  22
  23 #include <stdbool.h>
  24 #include "config.h"
  25
  26 #if defined(CPU_PP)
  27  /* Portalplayer chips use a microsecond timer. */
  28  #define TIMER_FREQ 1000000
  29 #elif defined(CPU_COLDFIRE)
  30  /* timer is based on busclk == cpuclk/2 */
  31  #define TIMER_FREQ (CPU_FREQ/2)
  32 #elif CONFIG_CPU == PNX0101
  33  #define TIMER_FREQ 3000000
  34 #elif CONFIG_CPU == S3C2440
  35  #include "timer-target.h"
  36 #elif defined(SIMULATOR)
  37  #define TIMER_FREQ 1000000
  38 #else
  39  #define TIMER_FREQ CPU_FREQ
  40 #endif
  41 bool timer_register(int reg_prio, void (*unregister_callback)(void),
  42                     long cycles, int int_prio, void (*timer_callback)(void));
  43 bool timer_set_period(long cycles);
  44 #ifdef CPU_COLDFIRE
  45 void timers_adjust_prescale(int multiplier, bool enable_irq);
  46 #endif
  47 void timer_unregister(void);
  48
  49 /* For target-specific interface use */
  50 extern void (*pfn_timer)(void);
  51 extern void (*pfn_unregister)(void);
  52
  53 #endif /* __TIMER_H__ */