forked from Imagelibrary/rtems
7ee5931393
The aim of this clock driver hook was to stop clock tick interrupts at some late point in the exit() procedure. The use of atexit() pulls in malloc() which pulls in errno. It is incompatible with the intention of the CONFIGURE_DISABLE_NEWLIB_REENTRANCY configuration option. The exit() function must be called from thread context, so accompanied clock tick interrupts should cause no harm. On the contrary, someone may assume a normal operating system operation, e.g. working timeouts. Remove the Clock_driver_support_shutdown_hardware() clock driver hook. Close #3436.
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() \
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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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