diff options
author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1997-07-31 22:13:29 +0000 |
---|---|---|
committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1997-07-31 22:13:29 +0000 |
commit | 0074691a67f857c9b3f880fb581e0af1d5673337 (patch) | |
tree | f80fd23129ad62236ee4f64eeaf537f53bbaa0b8 /c/src/lib/libbsp/m68k/ods68302/clock | |
parent | Merged very large and much appreciated patch from Chris Johns (diff) | |
download | rtems-0074691a67f857c9b3f880fb581e0af1d5673337.tar.bz2 |
Merged very large and much appreciated patch from Chris Johns
<cjohns@plessey.com.au>. This patch includes the ods68302 bsp,
the RTEMS++ class library, and the rtems++ test.
Diffstat (limited to 'c/src/lib/libbsp/m68k/ods68302/clock')
-rw-r--r-- | c/src/lib/libbsp/m68k/ods68302/clock/Makefile.in | 53 | ||||
-rw-r--r-- | c/src/lib/libbsp/m68k/ods68302/clock/ckinit.c | 162 |
2 files changed, 215 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/ods68302/clock/Makefile.in b/c/src/lib/libbsp/m68k/ods68302/clock/Makefile.in new file mode 100644 index 0000000000..8e325402ca --- /dev/null +++ b/c/src/lib/libbsp/m68k/ods68302/clock/Makefile.in @@ -0,0 +1,53 @@ +# +# $Id$ +# + +@SET_MAKE@ +srcdir = @srcdir@ +top_srcdir = @top_srcdir@ +VPATH=@srcdir@ + +PGM=${ARCH}/clock.rel + +# C source names, if any, go here -- minus the .c +C_PIECES=ckinit +C_FILES=$(C_PIECES:%=%.c) +C_O_FILES=$(C_PIECES:%=${ARCH}/%.o) + +H_FILES= + +SRCS=$(C_FILES) $(H_FILES) +OBJS=$(C_O_FILES) + +include $(RTEMS_CUSTOM) +include $(PROJECT_ROOT)/make/leaf.cfg + +# +# (OPTIONAL) Add local stuff here using += +# + +DEFINES += +CPPFLAGS += +CFLAGS += + +LD_PATHS += +LD_LIBS += +LDFLAGS += + +# +# Add your list of files to delete here. The config files +# already know how to delete some stuff, so you may want +# to just run 'make clean' first to see what gets missed. +# 'make clobber' already includes 'make clean' +# + +CLEAN_ADDITIONS += +CLOBBER_ADDITIONS += + +${PGM}: ${SRCS} ${OBJS} + $(make-rel) + +all: ${ARCH} $(SRCS) $(PGM) + +# the .rel file built here will be put into libbsp.a by ../wrapup/Makefile +install: all diff --git a/c/src/lib/libbsp/m68k/ods68302/clock/ckinit.c b/c/src/lib/libbsp/m68k/ods68302/clock/ckinit.c new file mode 100644 index 0000000000..f5745821f4 --- /dev/null +++ b/c/src/lib/libbsp/m68k/ods68302/clock/ckinit.c @@ -0,0 +1,162 @@ +/* Clock_init() + * + * This routine initializes Timer 1 for an MC68302. + * The tick frequency is 1 millisecond. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * COPYRIGHT (c) 1989-1997. + * 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> /* for atexit() */ + +#include <bsp.h> +#include <rtems/libio.h> + +#include "m68302.h" + +#define CLOCK_VECTOR 137 + +#define TMR1_VAL ( RBIT_TMR_RST /* software reset the timer */\ + | RBIT_TMR_ICLK_MASTER16 /* master clock divided by 16 */\ + | RBIT_TMR_FRR /* restart timer after ref reached */\ + | RBIT_TMR_ORI) /* enable interrupt when ref reached */ +#define TRR1_VAL 1000 /* 1000 ticks @ 16MHz/16 + * = 1 millisecond tick. + */ + +/* + * Clock_driver_ticks is a monotonically increasing counter of the + * number of clock ticks since the driver was initialized. + */ +volatile rtems_unsigned32 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. + */ +rtems_unsigned32 Clock_isrs; + +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; + +/* + * ISR Handler + */ + +rtems_isr Clock_isr( + rtems_vector_number vector +) +{ + Clock_driver_ticks += 1; + + m302.reg.isr = RBIT_ISR_TIMER1; /* clear in-service bit */ + m302.reg.ter1 = (RBIT_TER_REF | RBIT_TER_CAP); /* clear timer intr request */ + + if ( Clock_isrs == 1 ) { + rtems_clock_tick(); + Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; + } + else + Clock_isrs -= 1; +} + +void Install_clock( + rtems_isr_entry clock_isr +) +{ + + Clock_driver_ticks = 0; + Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; + + if ( BSP_Configuration.ticks_per_timeslice ) { + set_vector( clock_isr, CLOCK_VECTOR, 1 ); + + m302.reg.trr1 = TRR1_VAL; /* set timer reference register */ + m302.reg.tmr1 = TMR1_VAL; /* set timer mode register & enable */ + /* + * Enable TIMER1 interrupts only. + */ + m302.reg.imr = RBIT_IMR_TIMER1; /* set 68302 int-mask to allow ints */ + + atexit( Clock_exit ); + } +} + +void Clock_exit( void ) +{ + if ( BSP_Configuration.ticks_per_timeslice ) { + /* TODO: figure out what to do here */ + /* 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 ); + + /* + * 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_vector( args->buffer, CLOCK_VECTOR, 1 ); + rtems_interrupt_enable( isrlevel ); + } + +done: + return RTEMS_SUCCESSFUL; +} + |