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authorJoel Sherrill <joel.sherrill@OARcorp.com>1999-11-04 18:05:09 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>1999-11-04 18:05:09 +0000
commitf817b0283cce904d0bcb48cf9e641c2b40ba8f38 (patch)
treef8d686387ff9cf0639e38887ad23aef46e57db94 /c/src/lib/libbsp/powerpc/mcp750/clock
parentAdded first stab at mkgnatnewlib. (diff)
downloadrtems-f817b0283cce904d0bcb48cf9e641c2b40ba8f38.tar.bz2
The files in libcpu should not be directly dependent on any BSP. In
particular, using bsp.h, or getting information from the BSP which should properly be obtained from RTEMS is forbidden. This is necessary to strengthen the division between the BSP independent parts of RTEMS and the BSPs themselves. This started after comments and analysis by Ralf Corsepius <corsepiu@faw.uni-ulm.de>. The changes primarily eliminated the need to include bsp.h and peeking at BSP_Configuration. The use of Cpu_table in each BSP needs to be eliminated.
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mcp750/clock')
-rw-r--r--c/src/lib/libbsp/powerpc/mcp750/clock/Makefile.in75
-rw-r--r--c/src/lib/libbsp/powerpc/mcp750/clock/c_clock.c215
2 files changed, 290 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/mcp750/clock/Makefile.in b/c/src/lib/libbsp/powerpc/mcp750/clock/Makefile.in
new file mode 100644
index 0000000000..62122d9097
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/mcp750/clock/Makefile.in
@@ -0,0 +1,75 @@
+#
+# $Id$
+#
+
+@SET_MAKE@
+srcdir = @srcdir@
+top_srcdir = @top_srcdir@
+top_builddir = ../../..
+subdir = powerpc/mcp750/clock
+
+RTEMS_ROOT = @RTEMS_ROOT@
+PROJECT_ROOT = @PROJECT_ROOT@
+
+VPATH = @srcdir@
+
+PGM = ${ARCH}/clock.rel
+
+# C source names, if any, go here -- minus the .c
+C_PIECES = c_clock
+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_ROOT)/make/custom/@RTEMS_BSP@.cfg
+include $(RTEMS_ROOT)/make/leaf.cfg
+
+INSTALL_CHANGE = @INSTALL_CHANGE@
+mkinstalldirs = $(SHELL) $(top_srcdir)/@RTEMS_TOPdir@/mkinstalldirs
+
+INSTALLDIRS = $(PROJECT_INCLUDE)/bsp
+
+$(INSTALLDIRS):
+ @$(mkinstalldirs) $(INSTALLDIRS)
+
+#
+# (OPTIONAL) Add local stuff here using +=
+#
+
+DEFINES +=
+CPPFLAGS +=
+CFLAGS +=
+
+LD_PATHS +=
+LD_LIBS +=
+LDFLAGS +=
+
+#
+# Add your list of files to delete here. The config files
+# already know how to delete some stuff, so you may want
+# to just run 'make clean' first to see what gets missed.
+# 'make clobber' already includes 'make clean'
+#
+
+CLEAN_ADDITIONS +=
+CLOBBER_ADDITIONS +=
+
+${PGM}: ${SRCS} ${OBJS}
+ $(make-rel)
+
+preinstall:
+ @$(mkinstalldirs) $(PROJECT_INCLUDE)/bsp
+ @$(INSTALL_CHANGE) -m 644 $(H_FILES) $(PROJECT_INCLUDE)/bsp
+
+all: ${ARCH} $(SRCS) preinstall $(PGM)
+
+# the .rel file built here will be put into libbsp.a by ../wrapup/Makefile
+install: all
+
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+ cd $(top_builddir) \
+ && CONFIG_FILES=$(subdir)/$@ CONFIG_HEADERS= $(SHELL) ./config.status
diff --git a/c/src/lib/libbsp/powerpc/mcp750/clock/c_clock.c b/c/src/lib/libbsp/powerpc/mcp750/clock/c_clock.c
new file mode 100644
index 0000000000..b6fafcb7df
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/mcp750/clock/c_clock.c
@@ -0,0 +1,215 @@
+/*
+ * 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) 1989-1997.
+ * 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.
+ *
+ * Modified to support the MPC750.
+ * Modifications Copyright (c) 1999 Eric Valette valette@crf.canon.fr
+ *
+ * $Id$
+ */
+
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <rtems/libio.h>
+#include <stdlib.h> /* for atexit() */
+#include <assert.h>
+#include <libcpu/cpu.h>
+
+/*
+ * Clock ticks since initialization
+ */
+
+volatile rtems_unsigned32 Clock_driver_ticks;
+
+/*
+ * This is the value programmed into the count down timer.
+ */
+
+rtems_unsigned32 Clock_Decrementer_value;
+
+/*
+ * These are set by clock driver during its init
+ */
+
+rtems_device_major_number rtems_clock_major = ~0;
+rtems_device_minor_number rtems_clock_minor;
+
+void clockOff(const rtems_irq_connect_data* unused)
+{
+ if (BSP_Configuration.ticks_per_timeslice) {
+ /*
+ * Nothing to do as we cannot disable all interrupts and
+ * the decrementer interrupt enable is MSR_EE
+ */
+ }
+}
+static void clockOn(const rtems_irq_connect_data* unused)
+{
+ PPC_Set_decrementer( Clock_Decrementer_value );
+}
+
+/*
+ * Clock_isr
+ *
+ * This is the clock tick interrupt handler.
+ *
+ * Input parameters:
+ * vector - vector number
+ *
+ * Output parameters: NONE
+ *
+ * Return values: NONE
+ *
+ */
+void clockIsr()
+{
+ /*
+ * The driver has seen another tick.
+ */
+
+ PPC_Set_decrementer( Clock_Decrementer_value );
+
+ Clock_driver_ticks += 1;
+
+ /*
+ * Real Time Clock counter/timer is set to automatically reload.
+ */
+
+ rtems_clock_tick();
+}
+
+int clockIsOn(const rtems_irq_connect_data* unused)
+{
+ unsigned32 msr_value;
+
+ _CPU_MSR_GET( msr_value );
+ if (msr_value & MSR_EE) return 1;
+ return 0;
+}
+
+static rtems_irq_connect_data clockIrqData = {BSP_DECREMENTER,
+ clockIsr,
+ clockOn,
+ clockOff,
+ clockIsOn};
+
+
+/*
+ * 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 )
+{
+ if ( BSP_Configuration.ticks_per_timeslice ) {
+ BSP_remove_rtems_irq_handler (&clockIrqData);
+ }
+}
+
+/*
+ * 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
+)
+{
+ Clock_Decrementer_value = (BSP_bus_frequency/4000)*
+ (BSP_Configuration.microseconds_per_tick/1000);
+
+ if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
+ printk("Unable to initialize system clock\n");
+ rtems_fatal_error_occurred(1);
+ }
+ /* make major/minor avail to others such as shared memory driver */
+
+ rtems_clock_major = major;
+ rtems_clock_minor = minor;
+
+ return RTEMS_SUCCESSFUL;
+} /* Clock_initialize */
+
+/*
+ * 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;
+
+ Clock_Decrementer_value = (BSP_bus_frequency/4000)*
+ (BSP_Configuration.microseconds_per_tick/1000);
+
+ if (args->command == rtems_build_name('I', 'S', 'R', ' '))
+ clockIsr();
+ else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
+ {
+ if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
+ printk("Error installing clock interrupt handler!\n");
+ rtems_fatal_error_occurred(1);
+ }
+ }
+done:
+ return RTEMS_SUCCESSFUL;
+}
+
+
+
+
+
+