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/*  Clock_init()

 *

 *  This routine initializes the Z80386 1 on the MVME136 board.

 *  The tick frequency is 1 millisecond.

 *

 *  Input parameters:  NONE

 *

 *  Output parameters:  NONE

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: ckinit.c,v 1.2 2001-09-27 12:00:00 chris Exp $

 */

#include <stdlib.h>

#include <bsp.h>

#include <rtems/libio.h>

rtems_unsigned32 Clock_isrs;        /* ISRs until next tick */

volatile rtems_unsigned32 Clock_driver_ticks;

                                    /* ticks since initialization */

rtems_isr_entry  Old_ticker;

void Clock_exit( void );

#define CLOCK_VECTOR  TIMER_VECTOR

/*

 * These are set by clock driver during its init

 */

rtems_device_major_number rtems_clock_major = ~0;

rtems_device_minor_number rtems_clock_minor;

/*

 *  ISR Handler

 */

rtems_isr Clock_isr(

  rtems_vector_number vector

)

{

  Clock_driver_ticks += 1;

  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xE2 );

  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x22 );

  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xC6 );

  if ( Clock_isrs == 1 ) {

    rtems_clock_tick();

    Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;

  }

  else

    Clock_isrs -= 1;

}

void Install_clock(

  rtems_isr_entry clock_isr

)

{

  rtems_unsigned8 data;

  Clock_driver_ticks = 0;

  Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;

  Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 );

  Z8x36_WRITE( TIMER, MASTER_CFG, 0xd4 );

  Z8x36_READ ( TIMER, MASTER_INTR, data );

  Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x7E) );

  Z8x36_WRITE( TIMER, CT1_TIME_CONST_MSB, 0x04 );

  Z8x36_WRITE( TIMER, CT1_TIME_CONST_LSB, 0xCE );

  Z8x36_WRITE( TIMER, CT1_MODE_SPEC, 0x83 );

  Z8x36_WRITE( TIMER, CNT_TMR_VECTOR, CLOCK_VECTOR );

  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x20 );

  Z8x36_READ ( TIMER, MASTER_INTR, data );

  Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0xDA) | 0x80 );

  /*

   * ACC_IC54 - interrupt 5 will be vectored and mapped to level 6

   */

  data = (*(rtems_unsigned8 *)0x0D00000B);

  (*(rtems_unsigned8 *)0x0D00000B) = (data & 0x7F) | 0x60;

  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xC6 );

  atexit( Clock_exit );

}

void Clock_exit( void )

{

  rtems_unsigned8 data;

  Z8x36_READ ( TIMER, MASTER_INTR, data );

  Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x01) );

  /* do not restore old vector */

}

rtems_device_driver Clock_initialize(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void *pargp

)

{

  Install_clock( Clock_isr );

  /*

   * make major/minor avail to others such as shared memory driver

   */

  rtems_clock_major = major;

  rtems_clock_minor = minor;

  return RTEMS_SUCCESSFUL;

}

rtems_device_driver Clock_control(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void *pargp

)

{

    rtems_unsigned32 isrlevel;

    rtems_libio_ioctl_args_t *args = pargp;

    if (args == 0)

        goto done;

    /*

     * This is hokey, but until we get a defined interface

     * to do this, it will just be this simple...

     */

    if (args->command == rtems_build_name('I', 'S', 'R', ' '))

    {

        Clock_isr(CLOCK_VECTOR);

    }

    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))

    {

      rtems_interrupt_disable( isrlevel );

       (void) set_vector( args->buffer, CLOCK_VECTOR, 1 );

      rtems_interrupt_enable( isrlevel );

    }

done:

    return RTEMS_SUCCESSFUL;

}