forked from Imagelibrary/rtems
a6b2080e1c
This function is no longer supported by the standard clock driver implementation (clockimpl.h). Update #3436.
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
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* This routine initializes the Tick Timer 2 on the MVME147 board.
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* The tick frequency is 1 millisecond.
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*/
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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.org/license/LICENSE.
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*
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* MVME147 port for TNI - Telecom Bretagne
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* by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr)
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* May 1996
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*/
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#include <stdlib.h>
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#include <bsp.h>
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#include <rtems/clockdrv.h>
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#define MS_COUNT 65376 /* 1ms */
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/* MS_COUNT = 0x10000 - 1e-3/6.25e-6 */
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#define CLOCK_INT_LEVEL 6 /* T2's interrupt level */
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uint32_t Clock_isrs; /* ISRs until next tick */
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volatile uint32_t Clock_driver_ticks; /* ticks since initialization */
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rtems_isr_entry Old_ticker;
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static void Clock_exit( void );
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/*
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* ISR Handler
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*/
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static rtems_isr Clock_isr(rtems_vector_number vector)
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{
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Clock_driver_ticks += 1;
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pcc->timer2_int_control |= 0x80; /* Acknowledge interr. */
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if (Clock_isrs == 1) {
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rtems_clock_tick();
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Clock_isrs = rtems_configuration_get_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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static void Install_clock(rtems_isr_entry clock_isr )
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{
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Clock_driver_ticks = 0;
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Clock_isrs = rtems_configuration_get_microseconds_per_tick() / 1000;
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Old_ticker = (rtems_isr_entry) set_vector( clock_isr, TIMER_2_VECTOR, 1 );
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pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */
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pcc->timer2_preload = MS_COUNT;
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/* write preload value */
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pcc->timer2_control = 0x07; /* clear T2 overflow counter, enable counter */
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pcc->timer2_int_control = CLOCK_INT_LEVEL|0x08;
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/* Enable Timer 2 and set its int. level */
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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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pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */
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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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return RTEMS_SUCCESSFUL;
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}
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