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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <arch/drivers/tick.h>
  30. #include <arch/interrupt.h>
  31. #include <arch/asm.h>
  32. #include <arch/register.h>
  33. #include <debug.h>
  34. #include <time/clock.h>
  35. #include <typedefs.h>
  36.  
  37. /** Initialize tick interrupt. */
  38. void tick_init(void)
  39. {
  40.     tick_compare_reg_t compare;
  41.    
  42.     interrupt_register(14, "tick_int", tick_interrupt);
  43.     compare.int_dis = false;
  44.     compare.tick_cmpr = TICK_DELTA;
  45.     tick_compare_write(compare.value);
  46.     tick_write(0);
  47. }
  48.  
  49. /** Process tick interrupt.
  50.  *
  51.  * @param n Interrupt Level, 14,  (can be ignored)
  52.  * @param istate Interrupted state.
  53.  */
  54. void tick_interrupt(int n, istate_t *istate)
  55. {
  56.     softint_reg_t softint, clear;
  57.    
  58.     softint.value = softint_read();
  59.    
  60.     /*
  61.      * Make sure we are servicing interrupt_level_14
  62.      */
  63.     ASSERT(n == 14);
  64.    
  65.     /*
  66.      * Make sure we are servicing TICK_INT.
  67.      */
  68.     ASSERT(softint.tick_int);
  69.  
  70.     /*
  71.      * Clear tick interrupt.
  72.      */
  73.     clear.value = 0;
  74.     clear.tick_int = 1;
  75.     clear_softint_write(clear.value);
  76.    
  77.     /*
  78.      * Restart counter.
  79.      */
  80.     tick_write(0);
  81.    
  82.     clock();
  83. }
  84.