forked from Imagelibrary/rtems
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/**
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* @file
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* @ingroup sparc_leon2
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* @brief Clock Tick Device Driver
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*/
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/*
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* Clock Tick Device Driver
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*
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* This routine initializes LEON timer 1 which used for the clock tick.
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*
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* The tick frequency is directly programmed to the configured number of
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* microseconds per tick.
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*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* Modified for LEON BSP
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* COPYRIGHT (c) 2004.
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* Gaisler Research.
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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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#include <bsp.h>
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#include <bspopts.h>
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#if SIMSPARC_FAST_IDLE==1
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#define CLOCK_DRIVER_USE_FAST_IDLE 1
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#endif
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/*
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* The Real Time Clock Counter Timer uses this trap type.
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*/
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#define CLOCK_VECTOR LEON_TRAP_TYPE( LEON_INTERRUPT_TIMER1 )
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#define Clock_driver_support_at_tick()
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#define Clock_driver_support_install_isr( _new, _old ) \
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do { \
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_old = set_vector( _new, CLOCK_VECTOR, 1 ); \
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} while(0)
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extern int CLOCK_SPEED;
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#define Clock_driver_support_initialize_hardware() \
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do { \
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LEON_REG.Timer_Reload_1 = rtems_configuration_get_microseconds_per_tick() - 1; \
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\
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LEON_REG.Timer_Control_1 = ( \
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LEON_REG_TIMER_COUNTER_ENABLE_COUNTING | \
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LEON_REG_TIMER_COUNTER_RELOAD_AT_ZERO | \
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LEON_REG_TIMER_COUNTER_LOAD_COUNTER \
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); \
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} while (0)
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#define Clock_driver_support_shutdown_hardware() \
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do { \
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LEON_Mask_interrupt( LEON_INTERRUPT_TIMER1 ); \
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LEON_REG.Timer_Control_1 = 0; \
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} while (0)
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static uint32_t bsp_clock_nanoseconds_since_last_tick(void)
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{
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uint32_t clicks;
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uint32_t usecs;
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clicks = LEON_REG.Timer_Counter_1;
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if ( LEON_Is_interrupt_pending( LEON_INTERRUPT_TIMER1 ) ) {
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clicks = LEON_REG.Timer_Counter_1;
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usecs = (2*rtems_configuration_get_microseconds_per_tick() - clicks);
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} else {
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usecs = (rtems_configuration_get_microseconds_per_tick() - clicks);
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}
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return usecs * 1000;
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}
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#define Clock_driver_nanoseconds_since_last_tick bsp_clock_nanoseconds_since_last_tick
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#include "../../../shared/clockdrv_shell.h"
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