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/* Clock_init()
*
* This routine initializes the i960RP onboard timer
* The tick frequency is 1 millisecond; assuming 33MHz core
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* COPYRIGHT (c) 1989-1997.
* RAMiX Inc 1999
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may in
* the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <stdlib.h>
#include <bsp.h>
#include <i960RP.h>
#include <rtems/libio.h>
#define CLOCK_VECTOR 0x92
rtems_unsigned32 Clock_isrs; /* ISRs until next tick */
rtems_unsigned32 Reload_Clock_isrs;
i960_isr_entry Old_ticker;
rtems_unsigned32 Clock_driver_ticks;
/* ticks since initialization */
unsigned int clock_isr_global[16]; /* place to store global regs */
void Clock_exit( void );
/*
* These are set by clock driver during its init
*/
rtems_device_major_number rtems_clock_major = ~0;
rtems_device_minor_number rtems_clock_minor;
/* this is later in the file to avoid it being inlined */
rtems_isr Clock_isr( rtems_vector_number vector );
void Install_clock(
rtems_isr_entry clock_isr
)
{
volatile unsigned int *tmr0 = (unsigned int *) TMR0_ADDR;
volatile unsigned int *trr0 = (unsigned int *) TRR0_ADDR;
volatile unsigned int *tcr0 = (unsigned int *) TCR0_ADDR;
volatile unsigned int *icon = (unsigned int *) ICON_ADDR;
volatile unsigned int *imap2 = (unsigned int *) IMAP2_ADDR;
volatile unsigned int *ipnd = (unsigned int *) IPND_ADDR;
volatile unsigned int *imsk = (unsigned int *) IMSK_ADDR;
void clockHandler();
Clock_driver_ticks = 0;
Reload_Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
Clock_isrs = Reload_Clock_isrs;
/* Not for our case
if ( BSP_Configuration.ticks_per_timeslice ) {
*icon = 0x6000;
Old_ticker = set_vector( (((unsigned int) clock_isr) | 0x2), CLOCK_VECTOR, 1 );
*/
#define BUS_CLOCK_1 0
#define TMR_WRITE_CNTL 8
#define TMR_AUTO_RELOAD 4
#define TMR_ENABLE 2
#define TMR_TERM_CNT_STAT 1
Old_ticker = set_vector( (((unsigned int) clock_isr) | 0x2), CLOCK_VECTOR, 1 );
/*
*(unsigned int *)(CLOCK_VECTOR >>2) = (unsigned int )clockHandler;
*/
/* initialize the i960RP timer 0 here */
/* set the timer countdown (Assume 33MHz operation) */
*trr0 = 30 * BSP_Configuration.microseconds_per_tick ;
*tcr0 = 30 * BSP_Configuration.microseconds_per_tick ;
/*
kkprintf("Load the timers with %x\n", 30 * BSP_Configuration.microseconds_per_tick / Reload_Clock_isrs);
*/
*tmr0 = BUS_CLOCK_1 | TMR_AUTO_RELOAD | TMR_ENABLE;
/* Unmask the interrupts */
*ipnd &= ~(1 << 12);
*imsk |= 1 << 12;
}
void Clock_exit()
{
volatile unsigned int *tmr0 = (unsigned int *) TMR0_ADDR;
if ( BSP_Configuration.ticks_per_timeslice ) {
/* shut down the timer */
*tmr0 = *tmr0 & ~TMR_ENABLE;
i960_mask_intr( 12 );
/* do not restore old vector */
}
}
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
Install_clock( Clock_isr );
atexit( Clock_exit );
/*
* make major/minor avail to others such as shared memory driver
*/
rtems_clock_major = major;
rtems_clock_minor = minor;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver Clock_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
rtems_unsigned32 isrlevel;
rtems_libio_ioctl_args_t *args = pargp;
if (args == 0)
goto done;
/*
* This is hokey, but until we get a defined interface
* to do this, it will just be this simple...
*/
if (args->command == rtems_build_name('I', 'S', 'R', ' '))
{
Clock_isr(CLOCK_VECTOR);
}
else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
{
rtems_interrupt_disable( isrlevel );
(void) set_tmr_vector( args->buffer, CLOCK_VECTOR, 0 );
rtems_interrupt_enable( isrlevel );
}
done:
return RTEMS_SUCCESSFUL;
}
rtems_isr Clock_isr(
rtems_vector_number vector
)
{
/* enable_tracing(); */
#ifdef NOTMB
if ( Clock_isrs == 1 ) {
rtems_clock_tick();
Clock_isrs = Reload_Clock_isrs;
}
else
{
Clock_isrs -= 1;
}
#else
*(int *)(0xfed00000) += 1;
rtems_clock_tick();
#endif
i960_clear_intr( 12 );
}
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