forked from Imagelibrary/rtems
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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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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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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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_support_shutdown_hardware() \
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do { \
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/* Disable clock interrupts and stop */ \
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lm32_interrupt_unmask(CLOCK_IRQMASK); \
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clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_STOP); \
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} while (0)
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#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
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#include "../../../shared/dev/clock/clockimpl.h"
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