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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [gen68302/] [clock/] [ckinit.c] - Blame information for rev 30

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1 30 unneback 
/*  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.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: ckinit.c,v 1.2 2001-09-27 12:00:04 chris Exp $
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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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