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.
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
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* MC9328MXL clock specific using the System Timer
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*/
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/*
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* Copyright (c) 2004 by Cogent Computer Systems
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* Written by 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 <bsp.h>
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#include <bsp/irq.h>
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#include <mc9328mxl.h>
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#include <rtems/bspIo.h> /* for printk */
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/* this is defined in ../../../shared/dev/clock/clockimpl.h */
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void Clock_isr(rtems_irq_hdl_param arg);
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static void clock_isr_on(const rtems_irq_connect_data *unused);
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static void clock_isr_off(const rtems_irq_connect_data *unused);
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static int clock_isr_is_on(const rtems_irq_connect_data *irq);
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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 = BSP_INT_TIMER1,
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.hdl = Clock_isr,
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.handle = (void *)BSP_INT_TIMER1,
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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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/**
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* When we get the clock interrupt
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* - clear the interrupt bit?
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* - restart the timer?
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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 reg; \
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\
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reg = MC9328MXL_TMR1_TSTAT; \
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(void) reg; /* avoid set but not used warning */ \
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MC9328MXL_TMR1_TSTAT = 0; \
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} while(0)
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/**
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* Installs the clock ISR. You shouldn't need to change this.
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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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/**
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* Initialize the hardware for the clock
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* - Set the frequency
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* - enable it
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* - clear any pending interrupts
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*
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* Since you may want the clock always running, you can
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* enable interrupts here. If you do so, the clock_isr_on(),
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* clock_isr_off(), and clock_isr_is_on() functions can be
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* NOPs.
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*/
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#define Clock_driver_support_initialize_hardware() \
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do { \
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int freq; \
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int cnt; \
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freq = get_perclk1_freq(); \
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printk("perclk1 freq is %d\n", freq); \
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cnt = ((long long)freq * rtems_configuration_get_microseconds_per_tick() + 500000) / 1000000;\
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printk("cnt freq is %d\n", cnt); \
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MC9328MXL_TMR1_TCMP = cnt; \
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/* use PERCLK1 as input, enable timer */ \
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MC9328MXL_TMR1_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 | \
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MC9328MXL_TMR_TCTL_TEN | \
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MC9328MXL_TMR_TCTL_IRQEN); \
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/* set prescaler to 1 (register value + 1) */ \
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MC9328MXL_TMR1_TPRER = 0; \
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} while (0)
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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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MC9328MXL_TMR1_TCTL |= MC9328MXL_TMR_TCTL_IRQEN;
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MC9328MXL_AITC_INTENNUM = MC9328MXL_INT_TIMER1;
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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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MC9328MXL_TMR1_TCTL &= ~MC9328MXL_TMR_TCTL_IRQEN;
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MC9328MXL_AITC_INTDISNUM = MC9328MXL_INT_TIMER1;
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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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return MC9328MXL_TMR1_TCTL & MC9328MXL_TMR_TCTL_IRQEN;
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}
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#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
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/* Make sure to include this, and only at the end of the file */
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#include "../../../shared/dev/clock/clockimpl.h"
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