forked from Imagelibrary/rtems
f321db1980
* clock/ckinit.c, console/console.c, include/bsp.h, include/coverhd.h, startup/bspclean.c, startup/bspstart.c, timer/timer.c: URL for license changed.
158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/* Clock_init()
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*
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* This routine initializes Timer 1 for an MC68302.
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* The tick frequency is 1 millisecond.
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*
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* Input parameters: NONE
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*
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* Output parameters: NONE
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#include <stdlib.h> /* for atexit() */
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#include <bsp.h>
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#include <rtems/libio.h>
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#include "m68302.h"
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#define CLOCK_VECTOR 137
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#define TMR1_VAL ( RBIT_TMR_RST /* software reset the timer */\
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| RBIT_TMR_ICLK_MASTER16 /* master clock divided by 16 */\
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| RBIT_TMR_FRR /* restart timer after ref reached */\
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| RBIT_TMR_ORI) /* enable interrupt when ref reached */
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#define TRR1_VAL 1000 /* 1000 ticks @ 16MHz/16
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* = 1 millisecond tick.
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*/
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/*
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* Clock_driver_ticks is a monotonically increasing counter of the
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* number of clock ticks since the driver was initialized.
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*/
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volatile rtems_unsigned32 Clock_driver_ticks;
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/*
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* Clock_isrs is the number of clock ISRs until the next invocation of
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* the RTEMS clock tick routine. The clock tick device driver
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* gets an interrupt once a millisecond and counts down until the
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* length of time between the user configured microseconds per tick
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* has passed.
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*/
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rtems_unsigned32 Clock_isrs;
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void Clock_exit( void );
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/*
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* These are set by clock driver during its init
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*/
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rtems_device_major_number rtems_clock_major = ~0;
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rtems_device_minor_number rtems_clock_minor;
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/*
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* ISR Handler
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*/
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rtems_isr Clock_isr(
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rtems_vector_number vector
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)
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{
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Clock_driver_ticks += 1;
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m302.reg.isr = RBIT_ISR_TIMER1; /* clear in-service bit */
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m302.reg.ter1 = (RBIT_TER_REF | RBIT_TER_CAP); /* clear timer intr request */
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if ( Clock_isrs == 1 ) {
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rtems_clock_tick();
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Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
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}
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else
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Clock_isrs -= 1;
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}
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void Install_clock(
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rtems_isr_entry clock_isr
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)
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{
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Clock_driver_ticks = 0;
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Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
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set_vector( clock_isr, CLOCK_VECTOR, 1 );
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m302.reg.trr1 = TRR1_VAL; /* set timer reference register */
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m302.reg.tmr1 = TMR1_VAL; /* set timer mode register & enable */
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/*
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* Enable TIMER1 interrupts only.
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*/
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m302.reg.imr |= RBIT_IMR_TIMER1; /* set 68302 int-mask to allow ints */
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atexit( Clock_exit );
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}
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void Clock_exit( void )
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{
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/* TODO: figure out what to do here */
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/* do not restore old vector */
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}
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rtems_device_driver Clock_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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Install_clock( Clock_isr );
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/*
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* make major/minor avail to others such as shared memory driver
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*/
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rtems_clock_major = major;
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rtems_clock_minor = minor;
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver Clock_control(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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rtems_unsigned32 isrlevel;
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rtems_libio_ioctl_args_t *args = pargp;
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if (args == 0)
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goto done;
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/*
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* This is hokey, but until we get a defined interface
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* to do this, it will just be this simple...
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*/
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if (args->command == rtems_build_name('I', 'S', 'R', ' '))
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{
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Clock_isr( CLOCK_VECTOR);
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}
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else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
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{
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rtems_interrupt_disable( isrlevel );
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(void) set_vector( args->buffer, CLOCK_VECTOR, 1 );
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rtems_interrupt_enable( isrlevel );
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}
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done:
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return RTEMS_SUCCESSFUL;
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}
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