forked from Imagelibrary/rtems
2001-01-12 Eric Norum <eric.norum@usask.ca>
* README, clock/Makefile.am, clock/ckinit.c, clock/clock.c: Clock driver updated to use shell driver mechanism. * clock/ckinit.c: Removed. * clock/clock.c: New file.
This commit is contained in:
Joel Sherrill
@@ -1,3 +1,10 @@
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2001-01-12 Eric Norum <eric.norum@usask.ca>
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* README, clock/Makefile.am, clock/ckinit.c, clock/clock.c:
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Clock driver updated to use shell driver mechanism.
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* clock/ckinit.c: Removed.
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* clock/clock.c: New file.
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2000-12-19 Joel Sherrill <joel@OARcorp.com>
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2000-12-19 Joel Sherrill <joel@OARcorp.com>
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* Makefile.am: Removed unneeded blank line.
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* Makefile.am: Removed unneeded blank line.
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@@ -302,7 +302,7 @@ The board support package has been tested with:
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Interrupt Notes
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Interrupt Notes
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===============
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===============
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ckinit.c:
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clock.c:
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Occasional network lockups have been noted when the PIT has a higher
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Occasional network lockups have been noted when the PIT has a higher
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interrupt request level than the CPM. The SCC1 bit in the CISR is set
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interrupt request level than the CPM. The SCC1 bit in the CISR is set
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even though the SCC1 interrupt handler is not active. This blocks
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even though the SCC1 interrupt handler is not active. This blocks
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@@ -6,7 +6,7 @@ AUTOMAKE_OPTIONS = foreign 1.4
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PGM = $(ARCH)/clock.rel
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PGM = $(ARCH)/clock.rel
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C_FILES = ckinit.c
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C_FILES = clock.c
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C_O_FILES = $(C_FILES:%.c=$(ARCH)/%.o)
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C_O_FILES = $(C_FILES:%.c=$(ARCH)/%.o)
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OBJS = $(C_O_FILES)
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OBJS = $(C_O_FILES)
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@@ -28,6 +28,6 @@ all-local: $(ARCH) $(OBJS) $(PGM)
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.PRECIOUS: $(PGM)
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.PRECIOUS: $(PGM)
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EXTRA_DIST = ckinit.c
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EXTRA_DIST = clock.c
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include $(top_srcdir)/../../../../../../automake/local.am
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include $(top_srcdir)/../../../../../../automake/local.am
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@@ -1,192 +0,0 @@
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/*
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* This routine initializes the MC68360 Periodic Interval Timer
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*
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* The PIT has rather poor resolution, but it is easy to set up
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* and requires no housekeeping once it is going.
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*
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* Based on the `gen68302' board support package, and covered by the
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* original distribution terms.
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*
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* W. Eric Norum
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* Saskatchewan Accelerator Laboratory
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* University of Saskatchewan
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* Saskatoon, Saskatchewan, CANADA
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* eric@skatter.usask.ca
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*
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* $Id$
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*/
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/*
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* Input parameters: NONE
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*
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* Output parameters: NONE
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*/
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#include <stdlib.h> /* for atexit() */
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#include <bsp.h>
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#include <rtems/libio.h>
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#include "m68360.h"
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#define CLOCK_VECTOR 120
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#define CLOCK_IRQ_LEVEL 4
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/*
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* Clock_driver_ticks is a monotonically increasing counter of the
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* number of clock ticks since the driver was initialized.
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*/
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volatile rtems_unsigned32 Clock_driver_ticks;
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/*
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* These are set by clock driver during its init
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*/
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rtems_device_major_number rtems_clock_major = ~0;
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rtems_device_minor_number rtems_clock_minor;
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char M360DefaultWatchdogFeeder = 1;
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/*
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* RTEMS and hardware have different notions of clock rate.
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*/
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static unsigned long rtems_nsec_per_tick;
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static unsigned long pit_nsec_per_tick;
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/*
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* Periodic interval timer interrupt handler
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*/
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rtems_isr
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Clock_isr (rtems_vector_number vector)
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{
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static unsigned long nsec;
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/*
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* See if it's really time for a `tick'
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*/
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nsec += pit_nsec_per_tick;
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if (nsec >= rtems_nsec_per_tick) {
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nsec -= rtems_nsec_per_tick;
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/*
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* Perform a dummy read of DPRAM.
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* This works around a bug in Rev. B of the 68360
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*/
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m360.dpram0[0];
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/*
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* Feed the watchdog
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* Application code can override this by
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* setting M360DefaultWatchdogFeeder to zero.
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*/
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if (M360DefaultWatchdogFeeder) {
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m360.swsr = 0x55;
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m360.swsr = 0xAA;
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}
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/*
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* Announce the clock tick
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*/
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Clock_driver_ticks++;
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rtems_clock_tick();
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}
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}
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void
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Clock_exit (void)
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{
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/*
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* Turn off periodic interval timer
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*/
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m360.pitr &= ~0xFF;
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}
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static void
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Install_clock (rtems_isr_entry clock_isr)
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{
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int divisor;
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extern int m360_clock_rate; /* This should be somewhere in a config file */
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unsigned long nsec_per_chip_tick = 1000000000 / m360_clock_rate;
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unsigned long nsec_per_pit_tick = 512 * nsec_per_chip_tick;
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Clock_driver_ticks = 0;
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/*
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* Choose periodic interval timer register value
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* The rate at which the periodic interval timer
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* can generate interrupts is almost certainly not
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* the same as desired by the BSP configuration.
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* Handle the difference by choosing the largest PIT
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* interval which is less than or equal to the RTEMS
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* interval and skipping some hardware interrupts.
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* To reduce the jitter in the calls to RTEMS the
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* hardware interrupt interval is never less than
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* the maximum non-prescaled value from the PIT.
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*
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* For a 25 MHz external clock the basic clock rate is
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* 40 nsec * 128 * 4 = 20.48 usec/tick
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*/
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rtems_nsec_per_tick = BSP_Configuration.microseconds_per_tick * 1000;
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divisor = rtems_nsec_per_tick / nsec_per_pit_tick;
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if (divisor >= 256) {
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divisor = 255;
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} else if (divisor == 0) {
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divisor = 1;
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}
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pit_nsec_per_tick = nsec_per_pit_tick * divisor;
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m360.pitr &= ~0x1FF;
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m360.picr = (CLOCK_IRQ_LEVEL << 8) | CLOCK_VECTOR;
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set_vector (clock_isr, CLOCK_VECTOR, 1);
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m360.pitr |= divisor;
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atexit (Clock_exit);
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}
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rtems_device_driver
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Clock_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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Install_clock (Clock_isr);
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/*
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* make major/minor avail to others such as shared memory driver
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*/
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rtems_clock_major = major;
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rtems_clock_minor = minor;
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver Clock_control(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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rtems_unsigned32 isrlevel;
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rtems_libio_ioctl_args_t *args = pargp;
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if (args) {
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/*
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* This is hokey, but until we get a defined interface
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* to do this, it will just be this simple...
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*/
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if (args->command == rtems_build_name('I', 'S', 'R', ' ')) {
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Clock_isr( CLOCK_VECTOR);
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}
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else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) {
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rtems_interrupt_disable( isrlevel );
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(void) set_vector( args->buffer, CLOCK_VECTOR, 1 );
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rtems_interrupt_enable( isrlevel );
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}
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}
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return RTEMS_SUCCESSFUL;
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}
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102
c/src/lib/libbsp/m68k/gen68360/clock/clock.c
Normal file
102
c/src/lib/libbsp/m68k/gen68360/clock/clock.c
Normal file
@@ -0,0 +1,102 @@
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/*
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* This routine initializes the MC68360 Periodic Interval Timer
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*
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* The PIT has rather poor resolution, but it is easy to set up
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* and requires no housekeeping once it is going.
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*
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* W. Eric Norum
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* Saskatchewan Accelerator Laboratory
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* University of Saskatchewan
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* Saskatoon, Saskatchewan, CANADA
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* eric@skatter.usask.ca
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*
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* $Id$
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*/
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#include <rtems.h>
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#include <bsp.h>
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#include "m68360.h"
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#define CLOCK_VECTOR 120
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#define CLOCK_IRQ_LEVEL 4
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char M360DefaultWatchdogFeeder = 1;
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/*
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* RTEMS and hardware have different notions of clock rate.
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*/
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static unsigned long rtems_nsec_per_tick;
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static unsigned long pit_nsec_per_tick;
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static unsigned long nsec;
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/*
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* Periodic interval timer interrupt handler
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* See if it's really time for a `tick'
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||||||
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* Perform a dummy read of DPRAM (work around bug in Rev. B of the 68360).
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||||||
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* Feed the watchdog
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* Application code can override this by
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* setting M360DefaultWatchdogFeeder to zero.
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*/
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#define Clock_driver_support_at_tick() \
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do { \
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nsec += pit_nsec_per_tick; \
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if (nsec >= rtems_nsec_per_tick) \
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return; \
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nsec -= rtems_nsec_per_tick; \
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m360.dpram0[0]; \
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if (M360DefaultWatchdogFeeder) { \
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m360.swsr = 0x55; \
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m360.swsr = 0xAA; \
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} \
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} while (0) \
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/*
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* Attach clock interrupt handler
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*/
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#define Clock_driver_support_install_isr( _new, _old ) \
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do { \
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_old = (rtems_isr_entry)set_vector(_new, CLOCK_VECTOR, 1); \
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} while(0)
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/*
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* Turn off the clock
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*/
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#define Clock_driver_support_shutdown_hardware() \
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do { \
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m360.pitr &= ~0xFF; \
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} while(0)
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/*
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* Set up the clock hardware
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* The rate at which the periodic interval timer
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* can generate interrupts is almost certainly not
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* the same as desired by the BSP configuration.
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||||||
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* Handle the difference by choosing the largest PIT
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* interval which is less than or equal to the RTEMS
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||||||
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* interval and skipping some hardware interrupts.
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||||||
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* To reduce the jitter in the calls to RTEMS the
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||||||
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* hardware interrupt interval is never greater than
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||||||
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* the maximum non-prescaled value from the PIT.
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||||||
|
*
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||||||
|
* For a 25 MHz external clock the basic clock rate is
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* 40 nsec * 128 * 4 = 20.48 usec/tick
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*/
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#define Clock_driver_support_initialize_hardware() \
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do { \
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unsigned int divisor; \
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extern int m360_clock_rate; \
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unsigned long nsec_per_chip_tick = 1000000000 / m360_clock_rate; \
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unsigned long nsec_per_pit_tick = 512 * nsec_per_chip_tick; \
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rtems_nsec_per_tick = BSP_Configuration.microseconds_per_tick * 1000; \
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divisor = rtems_nsec_per_tick / nsec_per_pit_tick; \
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if (divisor > 255) \
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divisor = 255; \
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else if (divisor == 0) \
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divisor = 1; \
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pit_nsec_per_tick = nsec_per_pit_tick * divisor; \
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m360.pitr &= ~0x1FF; \
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m360.picr = (CLOCK_IRQ_LEVEL << 8) | CLOCK_VECTOR; \
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m360.pitr |= divisor; \
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} while (0)
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#include "../../../shared/clockdrv_shell.c"
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Reference in New Issue
Block a user