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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, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* $Id$
*/
#include <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <clockdrv.h>
rtems_unsigned32 Clock_isrs; /* ISRs until next tick */
volatile rtems_unsigned32 Clock_driver_ticks;
/* ticks since initialization */
rtems_isr_entry Old_ticker;
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp,
rtems_id tid,
rtems_unsigned32 *rval
)
{
Install_clock( Clock_isr );
}
void ReInstall_clock(
rtems_isr_entry clock_isr
)
{
rtems_unsigned32 isrlevel = 0 ;
rtems_interrupt_disable( isrlevel );
(void) set_vector( clock_isr, TIMER_VECTOR, 1 );
rtems_interrupt_enable( isrlevel );
}
void Install_clock(
rtems_isr_entry clock_isr
)
{
rtems_unsigned8 data;
Clock_driver_ticks = 0;
Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
if ( BSP_Configuration.ticks_per_timeslice ) {
Old_ticker = (rtems_isr_entry) set_vector( clock_isr, TIMER_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, TIMER_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;
if ( BSP_Configuration.ticks_per_timeslice ) {
Z8x36_READ ( TIMER, MASTER_INTR, data );
Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x01) );
/* do not restore old vector */
}
}
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