forked from Imagelibrary/rtems
1eed6f8bfc
Pass the parameter of the clock interrupt handler to Clock_driver_support_at_tick() and Clock_driver_timecounter_tick(). This makes it possible to use the interrupt handler argument in clock drivers. Use the interrupt handler provided by Clock_driver_support_install_isr() to avoid local delarations of Clock_isr(). Update #4862.
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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* AT91RM9200 clock specific using the System Timer
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*/
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/*
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* Copyright (c) 2003 by Cogent Computer Systems
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* Written by Mike Kelly <mike@cogcomp.com>
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* and Jay Monkman <jtm@lopingdog.com>
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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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#include <rtems.h>
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#include <rtems/clockdrv.h>
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#include <rtems/libio.h>
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#include <stdlib.h>
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#include <bsp.h>
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#include <bsp/irq.h>
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#include <at91rm9200.h>
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#include <at91rm9200_pmc.h>
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/**
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* Enables clock interrupt.
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*
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* If the interrupt is always on, this can be a NOP.
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*/
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static void clock_isr_on(const rtems_irq_connect_data *unused)
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{
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/* enable timer interrupt */
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ST_REG(ST_IER) = ST_SR_PITS;
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}
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/**
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* Disables clock interrupts
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*
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* If the interrupt is always on, this can be a NOP.
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*/
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static void clock_isr_off(const rtems_irq_connect_data *unused)
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{
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/* disable timer interrupt */
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ST_REG(ST_IDR) = ST_SR_PITS;
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}
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/**
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* Tests to see if clock interrupt is enabled, and returns 1 if so.
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* If interrupt is not enabled, returns 0.
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*
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* If the interrupt is always on, this always returns 1.
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*/
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static int clock_isr_is_on(const rtems_irq_connect_data *irq)
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{
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/* check timer interrupt */
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return ST_REG(ST_IMR) & ST_SR_PITS;
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}
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void Clock_isr(rtems_irq_hdl_param arg);
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/* Replace the first value with the clock's interrupt name. */
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rtems_irq_connect_data clock_isr_data = {
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.name = AT91RM9200_INT_SYSIRQ,
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.hdl = Clock_isr,
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.handle = NULL,
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.on = clock_isr_on,
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.off = clock_isr_off,
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.isOn = clock_isr_is_on,
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};
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#define Clock_driver_support_install_isr( _new ) \
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BSP_install_rtems_irq_handler(&clock_isr_data)
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static void Clock_driver_support_initialize_hardware(void)
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{
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uint32_t st_str;
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int slck;
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unsigned long value;
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/* the system timer is driven from SLCK */
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slck = at91rm9200_get_slck();
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value = (((rtems_configuration_get_microseconds_per_tick() * slck) +
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(1000000/2))/ 1000000);
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/* read the status to clear the int */
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st_str = ST_REG(ST_SR);
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(void) st_str; /* avoid set but not used warning */ \
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/* set priority */
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AIC_SMR_REG(AIC_SMR_SYSIRQ) = AIC_SMR_PRIOR(0x7);
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/* set the timer value */
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ST_REG(ST_PIMR) = value;
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}
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#define Clock_driver_support_at_tick(arg) \
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do { \
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uint32_t st_str; \
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\
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/* read the status to clear the int */ \
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st_str = ST_REG(ST_SR); \
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(void) st_str; /* avoid set but not used warning */ \
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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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