shared/clock/ckinit.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*
0004  *  Clock device driver for Lattice Mico32 (lm32).
0005  */
0006
0007 /*
0008  *  COPYRIGHT (c) 1989-2009.
0009  *  On-Line Applications Research Corporation (OAR).
0010  *
0011  * Redistribution and use in source and binary forms, with or without
0012  * modification, are permitted provided that the following conditions
0013  * are met:
0014  * 1. Redistributions of source code must retain the above copyright
0015  *    notice, this list of conditions and the following disclaimer.
0016  * 2. Redistributions in binary form must reproduce the above copyright
0017  *    notice, this list of conditions and the following disclaimer in the
0018  *    documentation and/or other materials provided with the distribution.
0019  *
0020  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0021  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0022  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0023  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0024  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0025  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0026  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0027  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0028  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0029  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0030  * POSSIBILITY OF SUCH DAMAGE.
0031  *
0032  *  Jukka Pietarinen <jukka.pietarinen@mrf.fi>, 2008,
0033  *  Micro-Research Finland Oy
0034  */
0035
0036 #include <bsp.h>
0037 #include "../include/system_conf.h"
0038 #include "clock.h"
0039 #include "bspopts.h"
0040
0041 #if LM32_ON_SIMULATOR
0042 #define CLOCK_DRIVER_USE_FAST_IDLE 1
0043 #endif
0044
0045 static inline int clockread(unsigned int reg)
0046 {
0047   return *((int*)(TIMER0_BASE_ADDRESS + reg));
0048 }
0049
0050 static inline void clockwrite(unsigned int reg, int value)
0051 {
0052   *((int*)(TIMER0_BASE_ADDRESS + reg)) = value;
0053 }
0054
0055 /*
0056  *  The interrupt vector number associated with the clock tick device
0057  *  driver.
0058  */
0059 #define CLOCK_VECTOR    ( TIMER0_IRQ )
0060 #define CLOCK_IRQMASK   ( 1 << CLOCK_VECTOR )
0061
0062 #define Clock_driver_support_at_tick(arg) \
0063   do { \
0064     /* Clear overflow flag */ \
0065     clockwrite(LM32_CLOCK_SR, 0); \
0066     lm32_interrupt_ack(CLOCK_IRQMASK); \
0067   } while (0)
0068
0069 #define Clock_driver_support_install_isr(_new ) \
0070   set_vector( _new, CLOCK_VECTOR, 1 )
0071
0072 static void Clock_driver_support_initialize_hardware(void)
0073 {
0074   /* Set clock period */
0075   clockwrite(LM32_CLOCK_PERIOD,
0076          (CPU_FREQUENCY /
0077           (1000000 / rtems_configuration_get_microseconds_per_tick())));
0078
0079   /* Enable clock interrupts and start in continuous mode */
0080   clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_ITO |
0081          LM32_CLOCK_CR_CONT |
0082          LM32_CLOCK_CR_START);
0083
0084   lm32_interrupt_unmask(CLOCK_IRQMASK);
0085 }
0086
0087 #define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
0088
0089 #include "../../../shared/dev/clock/clockimpl.h"
0090