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/*
* Use SYS_CLK as system clock
*
* Copyright (c) 2005-2006 Kolja Waschk, rtemsdev/ixo.de
*/
#include <rtems.h>
#include <bsp.h>
#define CLOCK_REGS ((altera_avalon_timer_regs*)NIOS2_IO_BASE(CLOCK_BASE))
/*
* Periodic interval timer interrupt handler
*/
#define Clock_driver_support_at_tick() \
do { CLOCK_REGS->status = 0; } while(0)
/*
* Attach clock interrupt handler
*/
#define Clock_driver_support_install_isr(_new) \
set_vector(_new, CLOCK_VECTOR, 1)
/*
* Turn off the clock
*/
#define Clock_driver_support_shutdown_hardware() \
do { \
CLOCK_REGS->control = ALTERA_AVALON_TIMER_CONTROL_STOP_MSK; \
} while (0)
/*
* Set up the clock hardware
*/
static void Clock_driver_support_initialize_hardware(void)
{
uint32_t period;
CLOCK_REGS->control = ALTERA_AVALON_TIMER_CONTROL_STOP_MSK;
period = (CLOCK_FREQ/1000000L)*rtems_configuration_get_microseconds_per_tick() - 1;
CLOCK_REGS->period_hi = period >> 16;
CLOCK_REGS->period_lo = period & 0xFFFF;
CLOCK_REGS->control = ALTERA_AVALON_TIMER_CONTROL_ITO_MSK |
ALTERA_AVALON_TIMER_CONTROL_CONT_MSK |
ALTERA_AVALON_TIMER_CONTROL_START_MSK;
NIOS2_IENABLE(1 << CLOCK_VECTOR);
}
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/clockdrv_shell.h"
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