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/* Clock_init()
*
* This routine initializes the Tick Timer 2 on the MVME162 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.
*
* Modifications of respective RTEMS file: COPYRIGHT (c) 1994.
* EISCAT Scientific Association. M.Savitski
*
* This material is a part of the MVME162 Board Support Package
* for the RTEMS executive. Its licensing policies are those of the
* RTEMS above.
*
* $Id$
*/
#include <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <clockdrv.h>
#define MS_COUNT 1000 /* T2's countdown constant (1 ms) */
#define CLOCK_INT_LEVEL 6 /* T2's interrupt level */
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( clock_isr )
rtems_isr_entry clock_isr;
{
rtems_unsigned32 isrlevel;
rtems_interrupt_disable( isrlevel );
(void) set_vector( clock_isr, (VECTOR_BASE >> 28) * 0x10 + 0x9, 1 );
rtems_interrupt_enable( isrlevel );
}
void Install_clock( clock_isr )
rtems_isr_entry clock_isr;
{
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, (VECTOR_BASE >> 28) * 0x10 + 0x9, 1 );
lcsr->vector_base = 0x67800000; /* set vb, enable interrupts */
lcsr->to_ctl = 0xE7; /* prescaler to 1 MHz (see Appendix A1) */
lcsr->timer_cmp_2 = MS_COUNT;
lcsr->timer_cnt_2 = 0; /* clear counter */
lcsr->board_ctl |= 0x700; /* increment, reset-on-compare, clear-ovfl-cnt */
lcsr->intr_level[0] |= CLOCK_INT_LEVEL * 0x10; /* set int level */
lcsr->intr_ena |= 0x02000000; /* enable tick timer 2 interrupt */
atexit( Clock_exit );
}
}
void Clock_exit( void )
{
/* Dummy for now. See other m68k BSP's for code examples */
}
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