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/**
* @file
*
* This file contains the clock driver initialization for the Hurricane BSP.
*/
/*
* Author: Craig Lebakken <craigl@transition.com>
*
* COPYRIGHT (c) 1996 by Transition Networks Inc.
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of Transition Networks not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* Transition Networks makes no representations about the suitability
* of this software for any purpose.
*
* Derived from c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c
*
* COPYRIGHT (c) 1989-2012.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/*
* Rather than deleting this, it is commented out to (hopefully) help
* the submitter send updates.
*
* static char _sccsid[] = "@(#)ckinit.c 08/20/96 1.3\n";
*/
#include <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <bsp/irq.h>
extern uint32_t bsp_clicks_per_microsecond;
#define EXT_INT1 0x800 /* external interrupt 5 */
#include "clock.h"
rtems_isr USC_isr(void *unused);
void reset_wdt(void);
void enable_wdi(void);
void init_hbt(void);
void enable_hbi(void);
void disable_hbi(void);
void Clock_exit(void);
rtems_isr Clock_isr(rtems_vector_number vector);
rtems_isr User_Clock_isr(rtems_vector_number vector);
void Install_clock(rtems_isr_entry clock_isr);
/*
* The interrupt vector number associated with the clock tick device
* driver.
*/
#define CLOCK_VECTOR_MASK EXT_INT1
#define CLOCK_VECTOR MIPS_INTERRUPT_BASE + 0x3
/*
* Clock_driver_ticks is a monotonically increasing counter of the
* number of clock ticks since the driver was initialized.
*/
volatile uint32_t Clock_driver_ticks;
/*
* Clock_isrs is the number of clock ISRs until the next invocation of
* the RTEMS clock tick routine. The clock tick device driver
* gets an interrupt once a millisecond and counts down until the
* length of time between the user configured microseconds per tick
* has passed.
*/
uint32_t Clock_isrs; /* ISRs until next tick */
/*
* The previous ISR on this clock tick interrupt vector.
*/
rtems_isr_entry Old_ticker;
void Clock_exit( void );
static uint32_t mips_timer_rate = 0;
/*
* Isr Handler
*/
rtems_isr Clock_isr(
rtems_vector_number vector
)
{
/*
* bump the number of clock driver ticks since initialization
*
* determine if it is time to announce the passing of tick as configured
* to RTEMS through the rtems_clock_tick directive
*
* perform any timer dependent tasks
*/
reset_wdt(); /* Reset hardware watchdog timer */
Clock_driver_ticks += 1;
rtems_clock_tick();
}
/* User callback shell (set from Clock_Control) */
static void (*user_callback)(void);
rtems_isr User_Clock_isr(
rtems_vector_number vector
)
{
if (user_callback)
user_callback();
}
/*
* Install_clock
*
* Install a clock tick handleR and reprograms the chip. This
* is used to initially establish the clock tick.
*/
void Install_clock(
rtems_isr_entry clock_isr
)
{
/*
* Initialize the clock tick device driver variables
*/
Clock_driver_ticks = 0;
Clock_isrs = rtems_configuration_get_milliseconds_per_tick();
mips_timer_rate = rtems_configuration_get_microseconds_per_tick() *
bsp_clicks_per_microsecond;
/*
* Hardware specific initialize goes here
*/
/* Set up USC heartbeat timer to generate interrupts */
disable_hbi(); /* Disable heartbeat interrupt in USC */
/* Install interrupt handler */
rtems_interrupt_handler_install(
CLOCK_VECTOR,
"clock",
0,
USC_isr,
NULL
);
init_hbt(); /* Initialize heartbeat timer */
reset_wdt(); /* Reset watchdog timer */
enable_wdi(); /* Enable watchdog interrupt in USC */
enable_hbi(); /* Enable heartbeat interrupt in USC */
/* Enable USC interrupt in MIPS processor */
mips_enable_in_interrupt_mask(CLOCK_VECTOR_MASK);
/*
* Schedule the clock cleanup routine to execute if the application exits.
*/
atexit( Clock_exit );
}
/*
* Clean up before the application exits
*/
void Clock_exit( void )
{
/* mips: turn off the timer interrupts */
mips_disable_in_interrupt_mask(~CLOCK_VECTOR_MASK);
}
/*
* Clock_initialize
*
* Device driver entry point for clock tick driver initialization.
*/
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
Install_clock( Clock_isr );
return RTEMS_SUCCESSFUL;
}
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