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  • This comparison shows the changes necessary to convert path 
    /openrisc/trunk/rtos/rtems/c/src/lib/libbsp/powerpc/psim/clock
    from Rev 30 to Rev 173
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  •

Rev 30 → Rev 173

/Makefile.am
0,0 → 1,32
##
## $Id: Makefile.am,v 1.2 2001-09-27 12:01:02 chris Exp $
##
 
AUTOMAKE_OPTIONS = foreign 1.4
 
PGM = $(ARCH)/clock.rel
 
C_FILES = clock.c
C_O_FILES = $(C_FILES:%.c=$(ARCH)/%.o)
 
OBJS = $(C_O_FILES)
 
include $(RTEMS_ROOT)/make/custom/@RTEMS_BSP@.cfg
include $(top_srcdir)/../../../../../../automake/lib.am
 
#
# (OPTIONAL) Add local stuff here using +=
#
 
$(PGM): $(OBJS)
$(make-rel)
 
# the .rel file built here will be put into libbsp.a by ../wrapup/Makefile
 
all-local: $(ARCH) $(OBJS) $(PGM)
 
.PRECIOUS: $(PGM)
 
EXTRA_DIST = clock.c
 
include $(top_srcdir)/../../../../../../automake/local.am
/clock.c
0,0 → 1,233
/*
* Clock Tick Device Driver
*
* This routine utilizes the Decrementer Register common to the PPC family.
*
* The tick frequency is directly programmed to the configured number of
* microseconds per tick.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id: clock.c,v 1.2 2001-09-27 12:01:02 chris Exp $
*/
 
#include <stdlib.h>
 
#include <bsp.h>
#include <rtems/libio.h>
 
/*
* The Real Time Clock Counter Timer uses this trap type.
*/
 
#define CLOCK_VECTOR PPC_IRQ_DECREMENTER
 
/*
* Clock ticks since initialization
*/
 
volatile rtems_unsigned32 Clock_driver_ticks;
 
/*
* This is the value programmed into the count down timer. It
* is artificially lowered when PSIM_FAST_IDLE is defined to
* cut down how long we spend in the idle task while executing on
* the simulator.
*/
 
extern rtems_unsigned32 CPU_PPC_CLICKS_PER_TICK;
 
rtems_isr_entry Old_ticker;
 
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;
 
/*
* Clock_isr
*
* This is the clock tick interrupt handler.
*
* Input parameters:
* vector - vector number
*
* Output parameters: NONE
*
* Return values: NONE
*
*/
 
#define PPC_Set_decrementer( _clicks ) \
do { \
asm volatile( "mtdec %0" : "=r" ((_clicks)) : "r" ((_clicks)) ); \
} while (0)
 
rtems_isr Clock_isr(
rtems_vector_number vector
)
{
/*
* Whether or not we we are in "fast idle" mode, the value for clicks
* per tick must be programmed. If we are using "fast idle" mode for
* a simulator, then the clicks per tick value is lowered to decrease
* the amount of time spent executing the idle task while using the
* an instruction simulator like psim.
*/
 
 
PPC_Set_decrementer( CPU_PPC_CLICKS_PER_TICK );
 
/*
* The driver has seen another tick.
*/
 
Clock_driver_ticks += 1;
 
/*
* Real Time Clock counter/timer is set to automatically reload.
*/
 
rtems_clock_tick();
}
 
/*
* Install_clock
*
* This routine actually performs the hardware initialization for the clock.
*
* Input parameters:
* clock_isr - clock interrupt service routine entry point
*
* Output parameters: NONE
*
* Return values: NONE
*
*/
 
extern int CLOCK_SPEED;
 
void Install_clock(
rtems_isr_entry clock_isr
)
{
Clock_driver_ticks = 0;
 
Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 );
 
PPC_Set_decrementer( CPU_PPC_CLICKS_PER_TICK );
 
atexit( Clock_exit );
}
 
/*
* Clock_exit
*
* This routine allows the clock driver to exit by masking the interrupt and
* disabling the clock's counter.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*
*/
 
void Clock_exit( void )
{
/* nothing to do */;
 
/* do not restore old vector */
}
/*
* Clock_initialize
*
* This routine initializes the clock driver.
*
* Input parameters:
* major - clock device major number
* minor - clock device minor number
* parg - pointer to optional device driver arguments
*
* Output parameters: NONE
*
* Return values:
* rtems_device_driver status code
*/
 
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
Install_clock( Clock_isr );
/*
* make major/minor avail to others such as shared memory driver
*/
rtems_clock_major = major;
rtems_clock_minor = minor;
return RTEMS_SUCCESSFUL;
}
/*
* Clock_control
*
* This routine is the clock device driver control entry point.
*
* Input parameters:
* major - clock device major number
* minor - clock device minor number
* parg - pointer to optional device driver arguments
*
* Output parameters: NONE
*
* Return values:
* rtems_device_driver status code
*/
 
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_vector( args->buffer, CLOCK_VECTOR, 1 );
rtems_interrupt_enable( isrlevel );
}
done:
return RTEMS_SUCCESSFUL;
}

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