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/* This file is part of test microkernel for OpenRISC 1000. */

/* (C) 2001 Simon Srot, srot@opencores.org */

#include "spr_defs.h"

#include "support.h"

/* Tick timer period */

unsigned long tick_period;

/* Inform of tick interrupt */

void (*tick_inf)();

/* Tick interrupt routine */

void tick_int()

{

  /* Call inf routine */

  (*tick_inf)();

  /* Set new counter period iand clear inet pending bit */

        mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | (tick_period & SPR_TTMR_PERIOD));

}

/* Initialize routine */

int tick_init(unsigned long period, void (* inf)())

{

  /* Save tick timer period and inform routine */

  tick_period = period;

  tick_inf = inf;

  /* Set counter period, enable timer and interrupt */

  mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | (period & SPR_TTMR_PERIOD));

  return 0;

}