source: rtems/bsps/powerpc/ss555/clock/p_clock.c @ 511dc4b

/*
 *  Clock Tick interrupt conexion code.
 *
 *  COPYRIGHT (c) 1989-1997.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may in
 *  the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 *
 *  SS555 port sponsored by Defence Research and Development Canada - Suffield
 *  Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca)
 *
 *  Derived from c/src/lib/libbsp/powerpc/mbx8xx/clock/p_clock.c:
 *
 *  Modified to support the MPC750.
 *  Modifications Copyright (c) 1999 Eric Valette valette@crf.canon.fr
 */

#include <bsp.h>
#include <bsp/irq.h>
#include <rtems/bspIo.h>
#include <mpc5xx.h>

static rtems_irq_connect_data clockIrqData = {
  CPU_PERIODIC_TIMER,
  (rtems_irq_hdl)Clock_isr,
  NULL,
  (rtems_irq_enable)clockOn,
  (rtems_irq_disable)clockOff,
  (rtems_irq_is_enabled)clockIsOn
};

int BSP_disconnect_clock_handler (void)
{
  if (!BSP_get_current_rtems_irq_handler(&clockIrqData)) {
     printk("Unable to stop system clock\n");
    rtems_fatal_error_occurred(1);
  }
  return BSP_remove_rtems_irq_handler (&clockIrqData);
}

int BSP_connect_clock_handler (rtems_irq_hdl hdl)
{
  if (!BSP_get_current_rtems_irq_handler(&clockIrqData)) {
     printk("Unable to get system clock handler\n");
    rtems_fatal_error_occurred(1);
  }
  if (!BSP_remove_rtems_irq_handler (&clockIrqData)) {
   printk("Unable to remove current system clock handler\n");
    rtems_fatal_error_occurred(1);
  }
  /*
   * Reinit structure
   */
  clockIrqData.name = CPU_PERIODIC_TIMER;
  clockIrqData.hdl = (rtems_irq_hdl) hdl;
  clockIrqData.on = (rtems_irq_enable)clockOn;
  clockIrqData.off = (rtems_irq_enable)clockOff;
  clockIrqData.isOn = (rtems_irq_is_enabled)clockIsOn;

  return BSP_install_rtems_irq_handler (&clockIrqData);
}