forked from Imagelibrary/rtems
135 lines
4.1 KiB
C
135 lines
4.1 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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* Do whatever you need to shut the clock down and remove the
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* interrupt handler. Since this normally only gets called on
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* RTEMS shutdown, you may not need to do anything other than
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* remove the ISR.
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*/
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#define Clock_driver_support_shutdown_hardware() \
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do { \
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/* Disable timer */ \
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MC9328MXL_TMR1_TCTL = 0; \
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BSP_remove_rtems_irq_handler(&clock_isr_data); \
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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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