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131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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* @ingroup RTEMSBSPsSPARCLEON2
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* @brief 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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/*
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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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <bsp.h>
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#include <bspopts.h>
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#include <rtems/sysinit.h>
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#include <rtems/timecounter.h>
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#include <bsp/sparc-counter.h>
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extern int CLOCK_SPEED;
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#define LEON2_TIMER_1_FREQUENCY 1000000
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static struct timecounter leon2_tc;
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static void leon2_clock_init( void )
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{
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struct timecounter *tc;
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tc = &leon2_tc;
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tc->tc_get_timecount = _SPARC_Get_timecount_clock;
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tc->tc_counter_mask = 0xffffffff;
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tc->tc_frequency = LEON2_TIMER_1_FREQUENCY;
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tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
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rtems_timecounter_install(tc);
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}
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static void leon2_clock_at_tick( void )
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{
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SPARC_Counter *counter;
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rtems_interrupt_level level;
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counter = &_SPARC_Counter;
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rtems_interrupt_local_disable(level);
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LEON_Clear_interrupt( LEON_INTERRUPT_TIMER1 );
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counter->accumulated += counter->interval;
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rtems_interrupt_local_enable(level);
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}
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static void leon2_clock_initialize_early( void )
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{
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SPARC_Counter *counter;
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LEON_REG.Timer_Reload_1 =
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rtems_configuration_get_microseconds_per_tick() - 1;
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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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counter = &_SPARC_Counter;
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counter->read_isr_disabled = _SPARC_Counter_read_clock_isr_disabled;
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counter->read = _SPARC_Counter_read_clock;
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counter->counter_register = &LEON_REG.Timer_Counter_1;
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counter->pending_register = &LEON_REG.Interrupt_Pending;
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counter->pending_mask = UINT32_C(1) << LEON_INTERRUPT_TIMER1;
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counter->accumulated = rtems_configuration_get_microseconds_per_tick();
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counter->interval = rtems_configuration_get_microseconds_per_tick();
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}
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RTEMS_SYSINIT_ITEM(
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leon2_clock_initialize_early,
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RTEMS_SYSINIT_CPU_COUNTER,
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RTEMS_SYSINIT_ORDER_FIRST
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);
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uint32_t _CPU_Counter_frequency( void )
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{
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return LEON2_TIMER_1_FREQUENCY;
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}
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#define Clock_driver_support_install_isr( _new ) \
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(void) rtems_interrupt_handler_install( \
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LEON_INTERRUPT_TIMER1, \
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"Clock", \
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RTEMS_INTERRUPT_SHARED, \
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_new, \
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NULL \
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)
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#define Clock_driver_support_at_tick() leon2_clock_at_tick()
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#define Clock_driver_support_initialize_hardware() leon2_clock_init()
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#include "../../../shared/dev/clock/clockimpl.h"
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SPARC_COUNTER_DEFINITION;
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