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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i386/] [ts_386ex/] [clock/] [ckinit.c] - Blame information for rev 593

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Line No. Rev Author Line
1 30 unneback
/*  Clock_initialize
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 *
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 *  This routine initializes the Timer/Counter on the Intel
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 *  386ex evaluation board.
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 *
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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 11:59:50 chris Exp $
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 */
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#include <bsp.h>
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#include <irq.h>
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#include <rtems/libio.h>
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#include <stdlib.h>
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rtems_unsigned32 Clock_isrs;              /* ISRs until next tick */
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static rtems_unsigned32 Clock_initial_isr_value;
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volatile rtems_unsigned32 Clock_driver_ticks;
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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_major_number rtems_clock_minor = 0;
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/*
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 *  This is the ISR handler.
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 */
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void Clock_isr()
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{
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  /* enable_tracing(); */
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  Clock_driver_ticks += 1;
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  if ( Clock_isrs == 1 ) {
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    rtems_clock_tick();
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    Clock_isrs = Clock_initial_isr_value; /* 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 ClockOff(const rtems_irq_connect_data* unused)
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{
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  outport_byte (TIMER_CONFIG, 0x80 ); /* disable the counter timer */
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}
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void ClockOn(const rtems_irq_connect_data* unused)
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{
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  outport_byte (TIMER_CONFIG, 0x00 ); /* enable the counter timer */
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}
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int ClockIsOn(const rtems_irq_connect_data* unused)
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{
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  return ((i8259s_cache & 0x1) == 0);
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}
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static rtems_irq_connect_data clockIrqData = {BSP_PERIODIC_TIMER,
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                                              Clock_isr,
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                                              ClockOn,
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                                              ClockOff,
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                                              ClockIsOn};
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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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  unsigned timer_counter_init_value;
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  unsigned char clock_lsb, clock_msb;
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#ifdef BSP_DEBUG
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  printk("Initializing clock driver in Clock_initialize().\n");
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#endif
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#ifdef LOAD_RTC_AT_START
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  /* Initialize clock from on-board real time clock.  This breaks the  */
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  /* test code which assumes which assumes the application will do it. */
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  {
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    rtems_time_of_day now;
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    /* External Prototypes */
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    extern void init_rtc(void);                /* defined in 'rtc.c' */
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    extern long rtc_read(rtems_time_of_day *); /* defined in 'rtc.c' */
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#ifdef BSP_DEBUG
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    printk("Loading clock from on-board real-time clock.\n");
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#endif
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    init_rtc();
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    if (rtc_read(&now) >= 0)
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      rtems_clock_set(&now);
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  }
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#endif
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  Clock_driver_ticks = 0;
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  Clock_isrs =
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    Clock_initial_isr_value =
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    BSP_Configuration.microseconds_per_tick / 1000; /* ticks per clock_isr */
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  /*
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   * configure the counter timer ( should be based on microsecs/tick )
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   * NB. The divisor(Clock_isrs) resolves the  is the same number that appears in confdefs.h
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   * when setting the microseconds_per_tick value.
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   */
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  ClockOff      ( &clockIrqData );
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  timer_counter_init_value  =  BSP_Configuration.microseconds_per_tick / Clock_isrs;
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  clock_lsb = (unsigned char)timer_counter_init_value;
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  clock_msb = timer_counter_init_value >> 8;
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  outport_byte (TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN);
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  outport_byte (TIMER_CNTR0, clock_lsb );   /* load LSB first */
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  outport_byte (TIMER_CNTR0, clock_msb );   /* then MSB       */
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  if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
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    printk("Unable to initialize system clock\n");
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    rtems_fatal_error_occurred(1);
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  }
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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
154
)
155
{
156
    rtems_libio_ioctl_args_t *args = pargp;
157
 
158
    if (args == 0)
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        goto done;
160
 
161
    /*
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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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     */
165
 
166
    if (args->command == rtems_build_name('I', 'S', 'R', ' '))
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    {
168
        Clock_isr();
169
    }
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    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
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    {
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      if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
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        printk("Error installing clock interrupt handler!\n");
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        rtems_fatal_error_occurred(1);
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      }
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#ifdef BSP_DEBUG
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      else
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        printk("Clock installed AGAIN\n");
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#endif
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    }
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182
done:
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    return RTEMS_SUCCESSFUL;
184
}
185
 
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void Clock_exit()
187
{
188
  ClockOff(&clockIrqData);
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  BSP_remove_rtems_irq_handler (&clockIrqData);
190
}

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