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authorJoel Sherrill <joel.sherrill@OARcorp.com>1999-11-18 21:22:58 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>1999-11-18 21:22:58 +0000
commit4a238002e71ec018723229f8669363a5ffb7302e (patch)
treefc5a57faf9a30225bd1f3fa2d713b85815cb77ef /c/src/lib/libcpu/sh/sh7045/timer
parent5503d75c00d94d2e0b7677d137c38a44e19d725e (diff)
downloadrtems-4a238002e71ec018723229f8669363a5ffb7302e.tar.bz2
Patch from "John M. Mills" <jmills@tga.com> with subsequent cleanup from
Ralf Corsepius <corsepiu@faw.uni-ulm.de> that adds initial Hitachi SH-2 support to RTEMS. Ralf's comments are: Changes: ------ 1. SH-Port: * Many files renamed. * CONSOLE_DEVNAME and MHZ defines removed from libcpu. * console.c moved to libbsp/sh/shared, build in libbsp/sh/<BSP>/console applying VPATH. * CONSOLE_DEVNAME made BSP-specific, replacement is defined in bsp.h * MHZ define replaced with HZ (extendent resolution) in custom/*.cfg * -DHZ=HZ used in bspstart.c, only * Makefile variable HZ used in bsp-dependent directories only. 2. SH1-Port * clock-driver rewritten to provide better resolution for odd CPU frequencies. This driver is only partially tested on hardware, ie. sightly experimental, but I don't expect severe problems with it. * Polling SCI-driver added. This driver is experimental and completly untested yet. Therefore it is not yet used for the console (/dev/console is still pointing to /dev/null, cf. gensh1/bsp.h). * minor changes to the timer driver * SH1 specific delay()/CPU_delay() now is implemented as a function 3. SH2-Port * Merged * IMO, the code is still in its infancy. Therefore I have interspersed comments (FIXME) it for items which I think John should look after. * sci and console drivers partially rewritten and extended (John, I hope you don't mind). * Copyright notices are not yet adapted
Diffstat (limited to 'c/src/lib/libcpu/sh/sh7045/timer')
-rw-r--r--c/src/lib/libcpu/sh/sh7045/timer/Makefile.in71
-rw-r--r--c/src/lib/libcpu/sh/sh7045/timer/timer.c208
2 files changed, 279 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/sh/sh7045/timer/Makefile.in b/c/src/lib/libcpu/sh/sh7045/timer/Makefile.in
new file mode 100644
index 0000000000..8bf33bee32
--- /dev/null
+++ b/c/src/lib/libcpu/sh/sh7045/timer/Makefile.in
@@ -0,0 +1,71 @@
+##
+## $Id$
+##
+
+@SET_MAKE@
+srcdir = @srcdir@
+top_srcdir = @top_srcdir@
+top_builddir = ../../..
+subdir = sh/sh7045/timer
+
+RTEMS_ROOT = @RTEMS_ROOT@
+PROJECT_ROOT = @PROJECT_ROOT@
+
+VPATH = @srcdir@
+
+PGM = ${ARCH}/timer.rel
+
+# C source names, if any, go here -- minus the .c
+C_PIECES = timer
+C_FILES = $(C_PIECES:%=%.c)
+C_O_FILES = $(C_PIECES:%=${ARCH}/%.o)
+
+H_FILES =
+
+# Assembly source names, if any, go here -- minus the .s
+S_PIECES =
+S_FILES = $(S_PIECES:%=%.s)
+S_O_FILES = $(S_FILES:%.s=${ARCH}/%.o)
+
+SRCS = $(C_FILES) $(H_FILES) $(S_FILES)
+OBJS = $(C_O_FILES) $(S_O_FILES)
+
+include $(RTEMS_ROOT)/make/custom/@RTEMS_BSP@.cfg
+include $(RTEMS_ROOT)/make/leaf.cfg
+
+INSTALL_CHANGE = @INSTALL_CHANGE@
+
+#
+# (OPTIONAL) Add local stuff here using +=
+#
+
+DEFINES +=
+CPPFLAGS +=
+CFLAGS +=
+
+LD_PATHS +=
+LD_LIBS +=
+LDFLAGS +=
+
+#
+# Add your list of files to delete here. The config files
+# already know how to delete some stuff, so you may want
+# to just run 'make clean' first to see what gets missed.
+# 'make clobber' already includes 'make clean'
+#
+
+CLEAN_ADDITIONS +=
+CLOBBER_ADDITIONS +=
+
+${PGM}: ${SRCS} ${OBJS}
+ $(make-rel)
+
+all: ${ARCH} $(SRCS) $(PGM)
+
+# the .rel file built here will be put into libbsp.a by
+# libbsp/sh/BSP/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/libcpu/sh/sh7045/timer/timer.c b/c/src/lib/libcpu/sh/sh7045/timer/timer.c
new file mode 100644
index 0000000000..029c0bec94
--- /dev/null
+++ b/c/src/lib/libcpu/sh/sh7045/timer/timer.c
@@ -0,0 +1,208 @@
+/*
+ * timer for the Hitachi SH 704X
+ *
+ * This file manages the benchmark timer used by the RTEMS Timing Test
+ * Suite. Each measured time period is demarcated by calls to
+ * Timer_initialize() and Read_timer(). Read_timer() usually returns
+ * the number of microseconds since Timer_initialize() exitted.
+ *
+ * NOTE: It is important that the timer start/stop overhead be
+ * determined when porting or modifying this code.
+ *
+ * Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and
+ * Bernd Becker (becker@faw.uni-ulm.de)
+ *
+ * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * COPYRIGHT (c) 1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems.h>
+
+#include <rtems/score/sh_io.h>
+#include <rtems/score/iosh7045.h>
+
+/*
+ * We use a Phi/4 timer
+ */
+#define SCALE (Timer_MHZ/4)
+
+#define MTU1_STARTMASK 0xfd
+#define MTU1_SYNCMASK 0xfd
+#define MTU1_MODEMASK 0xc0
+#define MTU1_TCRMASK 0x01
+#define MTU1_TIORMASK 0x88
+#define MTU1_STAT_MASK 0xf8
+#define MTU1_TIERMASK 0xfc
+#define IPRC_MTU1_MASK 0xfff0
+
+#ifndef MTU1_PRIO
+#define MTU1_PRIO 15
+#endif
+
+#define MTU1_VECTOR 86
+
+rtems_isr timerisr();
+
+static rtems_unsigned32 Timer_interrupts;
+
+rtems_boolean Timer_driver_Find_average_overhead;
+
+static rtems_unsigned32 Timer_MHZ ;
+
+void Timer_initialize( void )
+{
+ rtems_unsigned8 temp8;
+ rtems_unsigned16 temp16;
+ rtems_unsigned32 level;
+ rtems_isr *ignored;
+
+ Timer_MHZ = rtems_cpu_configuration_get_clicks_per_second() / 1000000 ;
+
+ /*
+ * Timer has never overflowed. This may not be necessary on some
+ * implemenations of timer but ....
+ */
+
+ Timer_interrupts /* .i */ = 0;
+ _CPU_ISR_Disable( level);
+
+ /*
+ * Somehow start the timer
+ */
+ /* stop Timer 1 */
+ temp8 = read8( MTU_TSTR) & MTU1_STARTMASK;
+ write8( temp8, MTU_TSTR);
+
+ /* initialize counter 1 */
+ write16( 0, MTU_TCNT1);
+
+ /* Timer 1 is independent of other timers */
+ temp8 = read8( MTU_TSYR) & MTU1_SYNCMASK;
+ write8( temp8, MTU_TSYR);
+
+ /* Timer 1, normal mode */
+ temp8 = read8( MTU_TMDR1) & MTU1_MODEMASK;
+ write8( temp8, MTU_TMDR1);
+
+ /* x0000000
+ * |||||+++--- Internal Clock
+ * |||++------ Count on rising edge
+ * |++-------- disable TCNT clear
+ * +---------- don`t care
+ */
+ write8( MTU1_TCRMASK, MTU_TCR1);
+
+ /* gra and grb are not used */
+ write8( MTU1_TIORMASK, MTU_TIOR1);
+
+ /* reset all status flags */
+ temp8 = read8( MTU_TSR1) & MTU1_STAT_MASK;
+ write8( temp8, MTU_TSR1);
+
+ /* enable overflow interrupt */
+ write8( MTU1_TIERMASK, MTU_TIER1);
+
+ /* set interrupt priority */
+ temp16 = read16( INTC_IPRC) & IPRC_MTU1_MASK;
+ temp16 |= MTU1_PRIO;
+ write16( temp16, INTC_IPRC);
+
+ /* initialize ISR */
+ _CPU_ISR_install_raw_handler( MTU1_VECTOR, timerisr, &ignored );
+ _CPU_ISR_Enable( level);
+
+ /* start timer 1 */
+ temp8 = read8( MTU_TSTR) | ~MTU1_STARTMASK;
+ write8( temp8, MTU_TSTR);
+}
+
+/*
+ * The following controls the behavior of Read_timer().
+ *
+ * AVG_OVERHEAD is the overhead for starting and stopping the timer. It
+ * is usually deducted from the number returned.
+ *
+ * LEAST_VALID is the lowest number this routine should trust. Numbers
+ * below this are "noise" and zero is returned.
+ */
+
+#define AVG_OVERHEAD 1 /* It typically takes X.X microseconds */
+ /* (Y countdowns) to start/stop the timer. */
+ /* This value is in microseconds. */
+#define LEAST_VALID 0 /* 20 */ /* Don't trust a clicks value lower than this */
+
+int Read_timer( void )
+{
+ rtems_unsigned32 clicks;
+ rtems_unsigned32 total ;
+ /*
+ * Read the timer and see how many clicks it has been since we started.
+ */
+
+
+ clicks = read16( MTU_TCNT1); /* XXX: read some HW here */
+
+ /*
+ * Total is calculated by taking into account the number of timer overflow
+ * interrupts since the timer was initialized and clicks since the last
+ * interrupts.
+ */
+
+ total = clicks + Timer_interrupts * 65536 ;
+
+ if ( Timer_driver_Find_average_overhead )
+ return total / SCALE; /* in XXX microsecond units */
+ else
+ {
+ if ( total < LEAST_VALID )
+ return 0; /* below timer resolution */
+ /*
+ * Somehow convert total into microseconds
+ */
+ return (total / SCALE - AVG_OVERHEAD) ;
+ }
+}
+
+/*
+ * Empty function call used in loops to measure basic cost of looping
+ * in Timing Test Suite.
+ */
+
+rtems_status_code Empty_function( void )
+{
+ return RTEMS_SUCCESSFUL;
+}
+
+void Set_find_average_overhead(
+ rtems_boolean find_flag
+)
+{
+ Timer_driver_Find_average_overhead = find_flag;
+}
+
+/* Timer 1 is used */
+
+#pragma interrupt
+void timerisr( void )
+{
+ unsigned8 temp8;
+
+ /* reset the flags of the status register */
+ temp8 = read8( MTU_TSR1) & MTU1_STAT_MASK;
+ write8( temp8, MTU_TSR1);
+
+ Timer_interrupts += 1;
+}