forked from Imagelibrary/rtems
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Clock device driver for Lattice Mico32 (lm32).
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*/
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/*
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* COPYRIGHT (c) 1989-2009.
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* On-Line Applications Research Corporation (OAR).
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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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* Jukka Pietarinen <jukka.pietarinen@mrf.fi>, 2008,
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* Micro-Research Finland Oy
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*/
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#include <bsp.h>
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#include "../include/system_conf.h"
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#include "clock.h"
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#include "bspopts.h"
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#if LM32_ON_SIMULATOR
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#define CLOCK_DRIVER_USE_FAST_IDLE 1
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#endif
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static inline int clockread(unsigned int reg)
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{
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return *((int*)(TIMER0_BASE_ADDRESS + reg));
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}
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static inline void clockwrite(unsigned int reg, int value)
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{
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*((int*)(TIMER0_BASE_ADDRESS + reg)) = value;
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}
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/*
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* The interrupt vector number associated with the clock tick device
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* driver.
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*/
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#define CLOCK_VECTOR ( TIMER0_IRQ )
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#define CLOCK_IRQMASK ( 1 << CLOCK_VECTOR )
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#define Clock_driver_support_at_tick() \
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do { \
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/* Clear overflow flag */ \
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clockwrite(LM32_CLOCK_SR, 0); \
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lm32_interrupt_ack(CLOCK_IRQMASK); \
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} while (0)
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#define Clock_driver_support_install_isr(_new ) \
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set_vector( _new, CLOCK_VECTOR, 1 )
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static void Clock_driver_support_initialize_hardware(void)
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{
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/* Set clock period */
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clockwrite(LM32_CLOCK_PERIOD,
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(CPU_FREQUENCY /
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(1000000 / rtems_configuration_get_microseconds_per_tick())));
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/* Enable clock interrupts and start in continuous mode */
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clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_ITO |
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LM32_CLOCK_CR_CONT |
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LM32_CLOCK_CR_START);
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lm32_interrupt_unmask(CLOCK_IRQMASK);
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}
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#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
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#include "../../../shared/dev/clock/clockimpl.h"
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