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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Clock device driver for Lattice Mico32 (lm32).
*/
/*
* COPYRIGHT (c) 1989-2009.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Jukka Pietarinen <jukka.pietarinen@mrf.fi>, 2008,
* Micro-Research Finland Oy
*/
#include <bsp.h>
#include "../include/system_conf.h"
#include "clock.h"
#include "bspopts.h"
#if LM32_ON_SIMULATOR
#define CLOCK_DRIVER_USE_FAST_IDLE 1
#endif
static inline int clockread(unsigned int reg)
{
return *((int*)(TIMER0_BASE_ADDRESS + reg));
}
static inline void clockwrite(unsigned int reg, int value)
{
*((int*)(TIMER0_BASE_ADDRESS + reg)) = value;
}
/*
* The interrupt vector number associated with the clock tick device
* driver.
*/
#define CLOCK_VECTOR ( TIMER0_IRQ )
#define CLOCK_IRQMASK ( 1 << CLOCK_VECTOR )
#define Clock_driver_support_at_tick(arg) \
do { \
/* Clear overflow flag */ \
clockwrite(LM32_CLOCK_SR, 0); \
lm32_interrupt_ack(CLOCK_IRQMASK); \
} while (0)
#define Clock_driver_support_install_isr(_new ) \
set_vector( _new, CLOCK_VECTOR, 1 )
static void Clock_driver_support_initialize_hardware(void)
{
/* Set clock period */
clockwrite(LM32_CLOCK_PERIOD,
(CPU_FREQUENCY /
(1000000 / rtems_configuration_get_microseconds_per_tick())));
/* Enable clock interrupts and start in continuous mode */
clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_ITO |
LM32_CLOCK_CR_CONT |
LM32_CLOCK_CR_START);
lm32_interrupt_unmask(CLOCK_IRQMASK);
}
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/dev/clock/clockimpl.h"
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