/*
* MC9328MXL clock specific using the System Timer
*
* This is hardware specific part of the clock driver. At the end of this
* file, the generic part of the driver is #included.
*
* Copyright (c) 2004 by Cogent Computer Systems
* Written by Jay Monkman <jtm@lopingdog.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
*
* http://www.rtems.com/license/LICENSE.
*
*
* $Id$
*/
#include <rtems.h>
#include <bsp.h>
#include <irq.h>
#include <mc9328mxl.h>
#include <rtems/bspIo.h> /* for printk */
/* this is defined in ../../../shared/clockdrv_shell.c */
rtems_isr Clock_isr(rtems_vector_number vector);
static void clock_isr_on(const rtems_irq_connect_data *unused);
static void clock_isr_off(const rtems_irq_connect_data *unused);
static int clock_isr_is_on(const rtems_irq_connect_data *irq);
/* Replace the first value with the clock's interrupt name. */
rtems_irq_connect_data clock_isr_data = {
.name = BSP_INT_TIMER1,
.hdl = (rtems_irq_hdl)Clock_isr,
.handle = (void *)BSP_INT_TIMER1,
.on = clock_isr_on,
.off = clock_isr_off,
.isOn = clock_isr_is_on,
};
/* If you follow the code, this is never used, so any value
* should work
*/
#define CLOCK_VECTOR 0
/**
* When we get the clock interrupt
* - clear the interrupt bit?
* - restart the timer?
*/
#define Clock_driver_support_at_tick() \
do { \
uint32_t reg; \
reg = MC9328MXL_TMR1_TSTAT; \
MC9328MXL_TMR1_TSTAT = 0; \
} while(0)
/**
* Installs the clock ISR. You shouldn't need to change this.
*/
#define Clock_driver_support_install_isr( _new, _old ) \
do { \
(_old) = NULL; \
BSP_install_rtems_irq_handler(&clock_isr_data); \
} while(0)
/**
* Initialize the hardware for the clock
* - Set the frequency
* - enable it
* - clear any pending interrupts
*
* Since you may want the clock always running, you can
* enable interrupts here. If you do so, the clock_isr_on(),
* clock_isr_off(), and clock_isr_is_on() functions can be
* NOPs.
*/
#define Clock_driver_support_initialize_hardware() \
do { \
int freq; \
int cnt; \
freq = get_perclk1_freq(); \
printk("perclk1 freq is %d\n", freq); \
cnt = ((long long)freq * rtems_configuration_get_microseconds_per_tick() + 500000) / 1000000;\
printk("cnt freq is %d\n", cnt); \
MC9328MXL_TMR1_TCMP = cnt; \
/* use PERCLK1 as input, enable timer */ \
MC9328MXL_TMR1_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 | \
MC9328MXL_TMR_TCTL_TEN | \
MC9328MXL_TMR_TCTL_IRQEN); \
/* set prescaler to 1 (register value + 1) */ \
MC9328MXL_TMR1_TPRER = 0; \
} while (0)
/**
* Do whatever you need to shut the clock down and remove the
* interrupt handler. Since this normally only gets called on
* RTEMS shutdown, you may not need to do anything other than
* remove the ISR.
*/
#define Clock_driver_support_shutdown_hardware() \
do { \
/* Disable timer */ \
MC9328MXL_TMR1_TCTL = 0; \
BSP_remove_rtems_irq_handler(&clock_isr_data); \
} while (0)
/**
* Enables clock interrupt.
*
* If the interrupt is always on, this can be a NOP.
*/
static void clock_isr_on(const rtems_irq_connect_data *unused)
{
MC9328MXL_TMR1_TCTL |= MC9328MXL_TMR_TCTL_IRQEN;
MC9328MXL_AITC_INTENNUM = MC9328MXL_INT_TIMER1;
return;
}
/**
* Disables clock interrupts
*
* If the interrupt is always on, this can be a NOP.
*/
static void clock_isr_off(const rtems_irq_connect_data *unused)
{
MC9328MXL_TMR1_TCTL &= ~MC9328MXL_TMR_TCTL_IRQEN;
MC9328MXL_AITC_INTDISNUM = MC9328MXL_INT_TIMER1;
return;
}
/**
* Tests to see if clock interrupt is enabled, and returns 1 if so.
* If interrupt is not enabled, returns 0.
*
* If the interrupt is always on, this always returns 1.
*/
static int clock_isr_is_on(const rtems_irq_connect_data *irq)
{
return MC9328MXL_TMR1_TCTL & MC9328MXL_TMR_TCTL_IRQEN;
}
/* Make sure to include this, and only at the end of the file */
#include "../../../../libbsp/shared/clockdrv_shell.c"
