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/* Clock_initialize
*
* This routine initializes the Timer/Counter on the Intel
* 386ex evaluation board.
*
* The tick frequency is 1 millisecond.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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.
*
* $Id$
*/
#include <bsp.h>
#include <irq.h>
#include <rtems/libio.h>
#include <stdlib.h>
rtems_unsigned32 Clock_isrs; /* ISRs until next tick */
volatile rtems_unsigned32 Clock_driver_ticks;
void Clock_exit( void );
/*
* These are set by clock driver during its init
*/
rtems_device_major_number rtems_clock_major = ~0;
rtems_device_major_number rtems_clock_minor = 0;
/*
* This is the ISR handler.
*/
void Clock_isr()
{
/* enable_tracing(); */
Clock_driver_ticks += 1;
if ( Clock_isrs == 1 ) {
rtems_clock_tick();
Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
}
else
Clock_isrs -= 1;
}
void ClockOff(const rtems_irq_connect_data* unused)
{
/* should do something here */;
}
void ClockOn(const rtems_irq_connect_data* unused)
{
/* The following is already set up in interns.s ->
( This is test code only... production code will move the
TMRCFG stuff here )
*/
#define TMR0 0xF040
#define TMR1 0xF041
#define TMR2 0xF042
#define TMRCON 0xF043
#define TMRCFG 0xF834
outport_byte ( TMRCFG , 0x80 );
outport_byte ( TMRCON , 0x34 );
outport_byte ( TMR0 , 0xA8 );
outport_byte ( TMR0 , 0x04 );
outport_byte ( TMRCFG , 0x00 );
}
int ClockIsOn(const rtems_irq_connect_data* unused)
{
return ((i8259s_cache & 0x1) == 0);
}
static rtems_irq_connect_data clockIrqData = {PC_386_PERIODIC_TIMER,
Clock_isr,
ClockOn,
ClockOff,
ClockIsOn};
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
Clock_driver_ticks = 0;
Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
if (!pc386_install_rtems_irq_handler (&clockIrqData)) {
printk("Unable to initialize system clock\n");
rtems_fatal_error_occurred(1);
}
/*
* 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_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();
}
else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
{
if (!pc386_install_rtems_irq_handler (&clockIrqData)) {
printk("Error installing clock interrupt handler!\n");
rtems_fatal_error_occurred(1);
}
}
done:
return RTEMS_SUCCESSFUL;
}
void Clock_exit()
{
pc386_remove_rtems_irq_handler (&clockIrqData);
}
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