forked from Imagelibrary/rtems
58b61b558c
* clock/ckinit.c, console/console.c, include/16550.h, include/DP8570A.h, include/bsp.h, spurious/spinit.c, startup/bspclean.c, startup/bspstart.c, startup/efi68k_tcp.c, startup/efi68k_wd.c, startup/setvec.c, timer/timer.c: URL for license changed.
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/* Clock_init()
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*
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* This routine initializes the DP8570A periodic interrupt on the
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* efi68k board. 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>
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#include <bsp.h>
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#include <rtems/libio.h>
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#define CLOCK_VECTOR (TCP_ISR_LEVEL+24)
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rtems_unsigned32 Clock_isrs; /* ISRs until next tick */
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volatile rtems_unsigned32 Clock_driver_ticks;
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/* ticks since initialization */
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rtems_isr_entry Old_ticker;
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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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void per_interrupt(void)
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{
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Clock_driver_ticks += 1;
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*MSR = PER;
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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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rtems_isr Clock_isr(
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rtems_vector_number vector
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)
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{
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unsigned char entry_msr, msr;
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entry_msr = *MSR;
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*MSR = 0;
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while ( (msr=*MSR) & INT )
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/* test enabled interrupt bits */
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if (msr & PER)
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per_interrupt();
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else if (msr & T0) {
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*MSR = T0; /* reset interrupt */
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Timer_interrupts++; /* inc wrap around counter */
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}
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else
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/* there has been an error if we reach this point */
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/* default action: reset all the interrupts */
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*MSR = ( PER | AL | T0 | T1 );
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*MSR = entry_msr & (RS | PS);
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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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Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 );
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*MSR = RS; /* enable 1mS interrupts */
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*ICR0 |= OME;
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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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/* shutdown periodic interrupt */
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*MSR = RS;
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*ICR0 &= 0xc0;
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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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