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/*
* Clock device driver for Lattice Mico32 (lm32).
*/
/*
* COPYRIGHT (c) 1989-2009.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*
* 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() \
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_support_shutdown_hardware() \
do { \
/* Disable clock interrupts and stop */ \
lm32_interrupt_unmask(CLOCK_IRQMASK); \
clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_STOP); \
} while (0)
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/dev/clock/clockimpl.h"
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