diff options
author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1996-09-06 18:11:41 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1996-09-06 18:11:41 +0000 |
commit | f198c63d6a1d172aef422353e42b41f8cb128275 (patch) | |
tree | f9f975562c842273fe349148c7bd58f9f38a8ee0 /c/src/lib/libcpu/mips64orion/clock | |
parent | added MIPS port by Craig Lebakken (lebakken@minn.net) and Derrick Ostertag (diff) | |
download | rtems-f198c63d6a1d172aef422353e42b41f8cb128275.tar.bz2 |
new file for MIPS port by Craig Lebakken (lebakken@minn.net) and
Derrick Ostertag (ostertag@transition.com).
Diffstat (limited to 'c/src/lib/libcpu/mips64orion/clock')
-rw-r--r-- | c/src/lib/libcpu/mips64orion/clock/ckinit.c | 245 | ||||
-rw-r--r-- | c/src/lib/libcpu/mips64orion/clock/clock.S | 44 | ||||
-rw-r--r-- | c/src/lib/libcpu/mips64orion/clock/clock.h | 24 |
3 files changed, 313 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/mips64orion/clock/ckinit.c b/c/src/lib/libcpu/mips64orion/clock/ckinit.c new file mode 100644 index 0000000000..9677a02b47 --- /dev/null +++ b/c/src/lib/libcpu/mips64orion/clock/ckinit.c @@ -0,0 +1,245 @@ + +/* ckinit.c + * + * This file contains the clock driver initialization for the IDT 4650. + * + * Author: Craig Lebakken <craigl@transition.com> + * + * COPYRIGHT (c) 1996 by Transition Networks Inc. + * + * To anyone who acknowledges that this file is provided "AS IS" + * without any express or implied warranty: + * permission to use, copy, modify, and distribute this file + * for any purpose is hereby granted without fee, provided that + * the above copyright notice and this notice appears in all + * copies, and that the name of Transition Networks not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * Transition Networks makes no representations about the suitability + * of this software for any purpose. + * + * Derived from c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c: + * + * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * ckinit.c,v 1.5 1995/10/30 21:53:23 joel Exp + */ + +#ifndef lint +static char _sccsid[] = "@(#)ckinit.c 08/20/96 1.3\n"; +#endif + +#include <stdlib.h> + +#include <rtems.h> +#include <rtems/libio.h> +#include <bsp.h> + +#include <excepthdr.h> + +#include "clock.h" + +#define CLOCKS_PER_MICROSECOND ( CPU_CLOCK_RATE_MHZ ) /* equivalent to CPU clock speed in MHz */ + +void Clock_exit( void ); +rtems_isr Clock_isr( rtems_vector_number vector ); + + +/* + * The interrupt vector number associated with the clock tick device + * driver. + */ + +#define CLOCK_VECTOR_MASK EXT_INT5 +#define CLOCK_VECTOR 0x7 + +/* + * 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; /* ISRs until next tick */ + +/* + * 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; + +void Clock_exit( void ); + +static unsigned32 mips_timer_rate = 0; + +/* + * 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 + */ + + /* refresh the internal CPU timer */ + mips_set_timer( mips_timer_rate ); + + Clock_driver_ticks += 1; + + rtems_clock_tick(); +} + +/* User callback shell (set from Clock_Control) */ +static void (*user_callback)(void); + +rtems_isr User_Clock_isr( + rtems_vector_number vector +) +{ + /* refresh the internal CPU timer */ + mips_set_timer( mips_timer_rate ); + + if (user_callback) + user_callback(); +} + +/* + * 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 +) +{ + /* + * Initialize the clock tick device driver variables + */ + + Clock_driver_ticks = 0; + Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; + + /* + * If ticks_per_timeslice is configured as non-zero, then the user + * wants a clock tick. + */ + + if ( BSP_Configuration.ticks_per_timeslice ) { + Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); + /* + * Hardware specific initialize goes here + */ + + mips_timer_rate = BSP_Configuration.microseconds_per_tick * CLOCKS_PER_MICROSECOND; + mips_set_timer( mips_timer_rate ); + enable_int(CLOCK_VECTOR_MASK); + } + + /* + * Schedule the clock cleanup routine to execute if the application exits. + */ + + atexit( Clock_exit ); +} + +/* + * Clean up before the application exits + */ + +void Clock_exit( void ) +{ + if ( BSP_Configuration.ticks_per_timeslice ) { + + /* mips: turn off the timer interrupts */ + disable_int(CLOCK_VECTOR_MASK); + + } +} + +/* + * 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) + 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 ); + user_callback = (void (*)(void))args->buffer; + (void) set_vector( User_Clock_isr, CLOCK_VECTOR, 1 ); + rtems_interrupt_enable( isrlevel ); + } + +done: + return RTEMS_SUCCESSFUL; +} diff --git a/c/src/lib/libcpu/mips64orion/clock/clock.S b/c/src/lib/libcpu/mips64orion/clock/clock.S new file mode 100644 index 0000000000..a41edf5ea5 --- /dev/null +++ b/c/src/lib/libcpu/mips64orion/clock/clock.S @@ -0,0 +1,44 @@ +/* clock.s + * + * This file contains the assembly code for the IDT 4650 clock driver. + * + * Author: Craig Lebakken <craigl@transition.com> + * + * COPYRIGHT (c) 1996 by Transition Networks Inc. + * + * To anyone who acknowledges that this file is provided "AS IS" + * without any express or implied warranty: + * permission to use, copy, modify, and distribute this file + * for any purpose is hereby granted without fee, provided that + * the above copyright notice and this notice appears in all + * copies, and that the name of Transition Networks not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * Transition Networks makes no representations about the suitability + * of this software for any purpose. + * + */ +/* @(#)clock.S 08/20/96 1.2 */ + +#include <rtems/score/iregdef.h> +#include <rtems/score/idtcpu.h> +#include <rtems/score/idtmon.h> + +FRAME(mips_set_timer,sp,0,ra) + .set noreorder + mfc0 t0,C0_COUNT + nop + addu t0,a0,t0 + mtc0 t0,C0_COMPARE + nop + j ra + .set reorder +ENDFRAME(mips_set_timer) + +FRAME(mips_get_timer,sp,0,ra) + .set noreorder + mfc0 v0,C0_COUNT + nop + j ra + .set reorder +ENDFRAME(mips_get_timer) diff --git a/c/src/lib/libcpu/mips64orion/clock/clock.h b/c/src/lib/libcpu/mips64orion/clock/clock.h new file mode 100644 index 0000000000..19bc7f6bfe --- /dev/null +++ b/c/src/lib/libcpu/mips64orion/clock/clock.h @@ -0,0 +1,24 @@ +/* clock.s + * + * This file contains the assembly code for the IDT 4650 clock driver. + * + * Author: Craig Lebakken <craigl@transition.com> + * + * COPYRIGHT (c) 1996 by Transition Networks Inc. + * + * To anyone who acknowledges that this file is provided "AS IS" + * without any express or implied warranty: + * permission to use, copy, modify, and distribute this file + * for any purpose is hereby granted without fee, provided that + * the above copyright notice and this notice appears in all + * copies, and that the name of Transition Networks not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * Transition Networks makes no representations about the suitability + * of this software for any purpose. + * + */ + +/* @(#)clock.h 08/20/96 1.2 */ + +extern void mips_set_timer( unsigned32 timer_clock_interval ); |