From 4a238002e71ec018723229f8669363a5ffb7302e Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Thu, 18 Nov 1999 21:22:58 +0000 Subject: Patch from "John M. Mills" with subsequent cleanup from Ralf Corsepius 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//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 --- c/src/lib/libcpu/sh/sh7045/clock/Makefile.in | 71 ++++++ c/src/lib/libcpu/sh/sh7045/clock/ckinit.c | 308 +++++++++++++++++++++++++++ 2 files changed, 379 insertions(+) create mode 100644 c/src/lib/libcpu/sh/sh7045/clock/Makefile.in create mode 100644 c/src/lib/libcpu/sh/sh7045/clock/ckinit.c (limited to 'c/src/lib/libcpu/sh/sh7045/clock') diff --git a/c/src/lib/libcpu/sh/sh7045/clock/Makefile.in b/c/src/lib/libcpu/sh/sh7045/clock/Makefile.in new file mode 100644 index 0000000000..9265994df8 --- /dev/null +++ b/c/src/lib/libcpu/sh/sh7045/clock/Makefile.in @@ -0,0 +1,71 @@ +## +## $Id$ +## + +@SET_MAKE@ +srcdir = @srcdir@ +top_srcdir = @top_srcdir@ +top_builddir = ../../.. +subdir = sh/sh7045/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 = ckinit +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 += $(CFLAGS_OS_V) + +LD_PATHS += +LD_LIBS += +LDFLAGS += + +# +# Add your list of files to delete here. The config files +# already know how to delete some stuff, so you may want +# to just run 'make clean' first to see what gets missed. +# 'make clobber' already includes 'make clean' +# + +CLEAN_ADDITIONS += +CLOBBER_ADDITIONS += + +${PGM}: ${SRCS} ${OBJS} + ${make-rel} + +all: ${ARCH} $(SRCS) $(PGM) + +# the .rel file built here will be put into libbsp.a by +# libbsp/sh/BSP/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/libcpu/sh/sh7045/clock/ckinit.c b/c/src/lib/libcpu/sh/sh7045/clock/ckinit.c new file mode 100644 index 0000000000..031ae3225e --- /dev/null +++ b/c/src/lib/libcpu/sh/sh7045/clock/ckinit.c @@ -0,0 +1,308 @@ +/* + * This file contains the clock driver the Hitachi SH 704X + * + * 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. + * + * Modified to reflect registers of sh7045 processor: + * John M. Mills (jmills@tga.com) + * TGA Technologies, Inc. + * 100 Pinnacle Way, Suite 140 + * Norcross, GA 30071 U.S.A. + * August, 1999 + * + * This modified file may be copied and distributed in accordance + * the above-referenced license. It is provided for critique and + * developmental purposes without any warranty nor representation + * by the authors or by TGA Technologies. + * + * 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 + +#include + +#include +#include +#include +#include +#include + +#define _MTU_COUNTER0_MICROSECOND (Clock_MHZ/4) + +#ifndef CLOCKPRIO +#define CLOCKPRIO 10 +#endif + +#define MTU0_STARTMASK 0xfe +#define MTU0_SYNCMASK 0xfe +#define MTU0_MODEMASK 0xc0 +#define MTU0_TCRMASK 0x01 /* bit 7 also used, vs 703x */ +#define MTU0_STAT_MASK 0xc0 +#define MTU0_IRQMASK 0xfe +#define MTU0_TIERMASK 0x01 +#define IPRC_MTU0_MASK 0xff0f +#define MTU0_TIORVAL 0x08 + +/* + * The interrupt vector number associated with the clock tick device + * driver. + */ + +#define CLOCK_VECTOR MTUA0_ISP_V + +/* + * 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; + +static void Clock_exit( void ); +static rtems_isr Clock_isr( rtems_vector_number vector ); +static rtems_unsigned32 Clock_MHZ ; + +/* + * 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; /* ISRs until next tick */ +static rtems_unsigned32 Clock_isrs_const; /* only calculated once */ + +/* + * These are set by clock driver during its init + */ + +rtems_device_major_number rtems_clock_major = ~0; +rtems_device_minor_number rtems_clock_minor; + +/* + * The previous ISR on this clock tick interrupt vector. + */ + +rtems_isr_entry Old_ticker; + +/* + * Isr Handler + */ + +rtems_isr Clock_isr( + rtems_vector_number vector +) +{ + /* + * bump the number of clock driver ticks since initialization + * + + * determine if it is time to announce the passing of tick as configured + * to RTEMS through the rtems_clock_tick directive + * + * perform any timer dependent tasks + */ + unsigned8 temp; + + /* reset the flags of the status register */ + temp = read8( MTU_TSR0) & MTU0_STAT_MASK; + write8( temp, MTU_TSR0); + + Clock_driver_ticks++ ; + + if( Clock_isrs == 1) + { + rtems_clock_tick(); + Clock_isrs = Clock_isrs_const; + } + else + { + Clock_isrs-- ; + } +} + +/* + * Install_clock + * + * Install a clock tick handler and reprograms the chip. This + * is used to initially establish the clock tick. + */ + +void Install_clock( + rtems_isr_entry clock_isr +) +{ + unsigned8 temp8 = 0; + + /* + * Initialize the clock tick device driver variables + */ + + Clock_driver_ticks = 0; + Clock_isrs_const = rtems_configuration_get_microseconds_per_tick() / 10000; + Clock_isrs = Clock_isrs_const; + + Clock_MHZ = rtems_cpu_configuration_get_clicks_per_second() / 1000000 ; + + /* + * If ticks_per_timeslice is configured as non-zero, then the user + * wants a clock tick. + */ + + if ( rtems_configuration_get_ticks_per_timeslice() ) { + rtems_interrupt_catch( Clock_isr, CLOCK_VECTOR, &Old_ticker ); + /* + * Hardware specific initialize goes here + */ + + /* stop Timer 0 */ + temp8 = read8( MTU_TSTR) & MTU0_STARTMASK; + write8( temp8, MTU_TSTR); + + /* set initial counter value to 0 */ + write16( 0, MTU_TCNT0); + + /* Timer 0 runs independent */ + temp8 = read8( MTU_TSYR) & MTU0_SYNCMASK; + write8( temp8, MTU_TSYR); + + /* Timer 0 normal mode */ + temp8 = read8( MTU_TMDR0) & MTU0_MODEMASK; + write8( temp8, MTU_TMDR0); + + /* TCNT is cleared by GRA ; internal clock /4 */ + write8( MTU0_TCRMASK , MTU_TCR0); + + /* use GRA without I/O - pins */ + write8( MTU0_TIORVAL, MTU_TIORL0); + + /* reset flags of the status register */ + temp8 = read8( MTU_TSR0) & MTU0_STAT_MASK; + write8( temp8, MTU_TSR0); + + /* Irq if is equal GRA */ + temp8 = read8( MTU_TIER0) | MTU0_TIERMASK; + write8( temp8, MTU_TIER0); + + /* set interrupt priority */ + if( sh_set_irq_priority( CLOCK_VECTOR, CLOCKPRIO ) != RTEMS_SUCCESSFUL) + rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED); + + /* set counter limits */ + write16( _MTU_COUNTER0_MICROSECOND * + rtems_configuration_get_microseconds_per_tick(), + + MTU_GR0A); + + /* start counter */ + temp8 = read8( MTU_TSTR) |~MTU0_STARTMASK; + write8( temp8, MTU_TSTR); + + } + + /* + * Schedule the clock cleanup routine to execute if the application exits. + */ + + atexit( Clock_exit ); +} + +/* + * Clean up before the application exits + */ + +void Clock_exit( void ) +{ + unsigned8 temp8 = 0; + if ( rtems_configuration_get_ticks_per_timeslice() ) { + + /* turn off the timer interrupts */ + /* set interrupt priority to 0 */ + if( sh_set_irq_priority( CLOCK_VECTOR, 0 ) != RTEMS_SUCCESSFUL) + rtems_fatal_error_occurred( RTEMS_UNSATISFIED); + +/* + * temp16 = read16( MTU_TIER0) & IPRC_MTU0_IRQMASK; + * write16( temp16, MTU_TIER0); + */ + + /* stop counter */ + temp8 = read8( MTU_TSTR) & MTU0_STARTMASK; + write8( temp8, MTU_TSTR); + + /* old vector shall not be installed */ + } +} + +/* + * Clock_initialize + * + * Device driver entry point for clock tick driver initialization. + */ + +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) + { + /* + * 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_isr_entry ignored ; + rtems_interrupt_disable( isrlevel ); + rtems_interrupt_catch( args->buffer, CLOCK_VECTOR, &ignored ); + + rtems_interrupt_enable( isrlevel ); + } + } + return RTEMS_SUCCESSFUL; +} -- cgit v1.2.3