[f198c63] | 1 | |
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| 2 | /* ckinit.c |
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| 3 | * |
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| 4 | * This file contains the clock driver initialization for the IDT 4650. |
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| 5 | * |
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| 6 | * Author: Craig Lebakken <craigl@transition.com> |
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| 7 | * |
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| 8 | * COPYRIGHT (c) 1996 by Transition Networks Inc. |
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| 9 | * |
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| 10 | * To anyone who acknowledges that this file is provided "AS IS" |
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| 11 | * without any express or implied warranty: |
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| 12 | * permission to use, copy, modify, and distribute this file |
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| 13 | * for any purpose is hereby granted without fee, provided that |
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| 14 | * the above copyright notice and this notice appears in all |
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| 15 | * copies, and that the name of Transition Networks not be used in |
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| 16 | * advertising or publicity pertaining to distribution of the |
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| 17 | * software without specific, written prior permission. |
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| 18 | * Transition Networks makes no representations about the suitability |
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| 19 | * of this software for any purpose. |
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| 20 | * |
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| 21 | * Derived from c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c: |
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| 22 | * |
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[03f2154e] | 23 | * COPYRIGHT (c) 1989-1997. |
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[f198c63] | 24 | * On-Line Applications Research Corporation (OAR). |
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[03f2154e] | 25 | * Copyright assigned to U.S. Government, 1994. |
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[f198c63] | 26 | * |
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[98e4ebf5] | 27 | * The license and distribution terms for this file may be |
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| 28 | * found in the file LICENSE in this distribution or at |
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[03f2154e] | 29 | * http://www.OARcorp.com/rtems/license.html. |
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[f198c63] | 30 | * |
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[0971cd5] | 31 | * $Id$ |
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[f198c63] | 32 | */ |
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| 33 | |
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[82478528] | 34 | /* |
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| 35 | * Rather than deleting this, it is commented out to (hopefully) help |
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| 36 | * the submitter send updates. |
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| 37 | * |
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| 38 | * static char _sccsid[] = "@(#)ckinit.c 08/20/96 1.3\n"; |
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| 39 | */ |
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| 40 | |
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[f198c63] | 41 | |
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| 42 | #include <stdlib.h> |
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| 43 | |
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| 44 | #include <rtems.h> |
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| 45 | #include <rtems/libio.h> |
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| 46 | #include <bsp.h> |
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| 47 | |
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[b944007b] | 48 | #define EXT_INT5 0x8000 /* external interrupt 5 */ |
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[f198c63] | 49 | |
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| 50 | #include "clock.h" |
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| 51 | |
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| 52 | #define CLOCKS_PER_MICROSECOND ( CPU_CLOCK_RATE_MHZ ) /* equivalent to CPU clock speed in MHz */ |
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| 53 | |
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| 54 | void Clock_exit( void ); |
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| 55 | rtems_isr Clock_isr( rtems_vector_number vector ); |
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| 56 | |
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| 57 | |
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| 58 | /* |
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| 59 | * The interrupt vector number associated with the clock tick device |
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| 60 | * driver. |
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| 61 | */ |
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| 62 | |
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| 63 | #define CLOCK_VECTOR_MASK EXT_INT5 |
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| 64 | #define CLOCK_VECTOR 0x7 |
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| 65 | |
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| 66 | /* |
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| 67 | * Clock_driver_ticks is a monotonically increasing counter of the |
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| 68 | * number of clock ticks since the driver was initialized. |
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| 69 | */ |
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| 70 | |
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| 71 | volatile rtems_unsigned32 Clock_driver_ticks; |
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| 72 | |
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| 73 | /* |
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| 74 | * Clock_isrs is the number of clock ISRs until the next invocation of |
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| 75 | * the RTEMS clock tick routine. The clock tick device driver |
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| 76 | * gets an interrupt once a millisecond and counts down until the |
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| 77 | * length of time between the user configured microseconds per tick |
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| 78 | * has passed. |
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| 79 | */ |
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| 80 | |
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| 81 | rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ |
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| 82 | |
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| 83 | /* |
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| 84 | * These are set by clock driver during its init |
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| 85 | */ |
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| 86 | |
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| 87 | rtems_device_major_number rtems_clock_major = ~0; |
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| 88 | rtems_device_minor_number rtems_clock_minor; |
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| 89 | |
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| 90 | /* |
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| 91 | * The previous ISR on this clock tick interrupt vector. |
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| 92 | */ |
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| 93 | |
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| 94 | rtems_isr_entry Old_ticker; |
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| 95 | |
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| 96 | void Clock_exit( void ); |
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| 97 | |
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| 98 | static unsigned32 mips_timer_rate = 0; |
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| 99 | |
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| 100 | /* |
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| 101 | * Isr Handler |
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| 102 | */ |
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| 103 | |
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| 104 | rtems_isr Clock_isr( |
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| 105 | rtems_vector_number vector |
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| 106 | ) |
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| 107 | { |
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| 108 | /* |
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| 109 | * bump the number of clock driver ticks since initialization |
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| 110 | * |
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| 111 | * determine if it is time to announce the passing of tick as configured |
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| 112 | * to RTEMS through the rtems_clock_tick directive |
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| 113 | * |
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| 114 | * perform any timer dependent tasks |
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| 115 | */ |
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| 116 | |
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| 117 | /* refresh the internal CPU timer */ |
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| 118 | mips_set_timer( mips_timer_rate ); |
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| 119 | |
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| 120 | Clock_driver_ticks += 1; |
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| 121 | |
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| 122 | rtems_clock_tick(); |
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| 123 | } |
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| 124 | |
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| 125 | /* User callback shell (set from Clock_Control) */ |
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| 126 | static void (*user_callback)(void); |
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| 127 | |
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| 128 | rtems_isr User_Clock_isr( |
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| 129 | rtems_vector_number vector |
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| 130 | ) |
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| 131 | { |
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| 132 | /* refresh the internal CPU timer */ |
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| 133 | mips_set_timer( mips_timer_rate ); |
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| 134 | |
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| 135 | if (user_callback) |
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| 136 | user_callback(); |
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| 137 | } |
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| 138 | |
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| 139 | /* |
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| 140 | * Install_clock |
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| 141 | * |
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| 142 | * Install a clock tick handleR and reprograms the chip. This |
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| 143 | * is used to initially establish the clock tick. |
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| 144 | */ |
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| 145 | |
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| 146 | void Install_clock( |
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| 147 | rtems_isr_entry clock_isr |
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| 148 | ) |
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| 149 | { |
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| 150 | /* |
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| 151 | * Initialize the clock tick device driver variables |
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| 152 | */ |
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| 153 | |
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| 154 | Clock_driver_ticks = 0; |
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| 155 | Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; |
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| 156 | |
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| 157 | /* |
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| 158 | * If ticks_per_timeslice is configured as non-zero, then the user |
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| 159 | * wants a clock tick. |
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| 160 | */ |
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| 161 | |
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| 162 | if ( BSP_Configuration.ticks_per_timeslice ) { |
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| 163 | Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); |
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| 164 | /* |
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| 165 | * Hardware specific initialize goes here |
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| 166 | */ |
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| 167 | |
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| 168 | mips_timer_rate = BSP_Configuration.microseconds_per_tick * CLOCKS_PER_MICROSECOND; |
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| 169 | mips_set_timer( mips_timer_rate ); |
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| 170 | enable_int(CLOCK_VECTOR_MASK); |
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| 171 | } |
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| 172 | |
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| 173 | /* |
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| 174 | * Schedule the clock cleanup routine to execute if the application exits. |
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| 175 | */ |
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| 176 | |
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| 177 | atexit( Clock_exit ); |
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| 178 | } |
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| 179 | |
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| 180 | /* |
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| 181 | * Clean up before the application exits |
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| 182 | */ |
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| 183 | |
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| 184 | void Clock_exit( void ) |
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| 185 | { |
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| 186 | if ( BSP_Configuration.ticks_per_timeslice ) { |
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| 187 | |
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| 188 | /* mips: turn off the timer interrupts */ |
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| 189 | disable_int(CLOCK_VECTOR_MASK); |
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| 190 | |
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| 191 | } |
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| 192 | } |
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| 193 | |
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| 194 | /* |
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| 195 | * Clock_initialize |
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| 196 | * |
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| 197 | * Device driver entry point for clock tick driver initialization. |
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| 198 | */ |
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| 199 | |
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| 200 | rtems_device_driver Clock_initialize( |
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| 201 | rtems_device_major_number major, |
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| 202 | rtems_device_minor_number minor, |
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| 203 | void *pargp |
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| 204 | ) |
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| 205 | { |
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| 206 | Install_clock( Clock_isr ); |
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| 207 | |
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| 208 | /* |
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| 209 | * make major/minor avail to others such as shared memory driver |
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| 210 | */ |
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| 211 | |
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| 212 | rtems_clock_major = major; |
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| 213 | rtems_clock_minor = minor; |
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| 214 | |
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| 215 | return RTEMS_SUCCESSFUL; |
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| 216 | } |
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| 217 | |
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| 218 | rtems_device_driver Clock_control( |
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| 219 | rtems_device_major_number major, |
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| 220 | rtems_device_minor_number minor, |
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| 221 | void *pargp |
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| 222 | ) |
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| 223 | { |
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| 224 | rtems_unsigned32 isrlevel; |
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| 225 | rtems_libio_ioctl_args_t *args = pargp; |
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| 226 | |
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| 227 | if (args == 0) |
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| 228 | goto done; |
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| 229 | |
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| 230 | /* |
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| 231 | * This is hokey, but until we get a defined interface |
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| 232 | * to do this, it will just be this simple... |
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| 233 | */ |
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| 234 | |
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| 235 | if (args->command == rtems_build_name('I', 'S', 'R', ' ')) |
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| 236 | { |
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| 237 | Clock_isr(CLOCK_VECTOR); |
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| 238 | } |
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| 239 | else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) |
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| 240 | { |
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| 241 | rtems_interrupt_disable( isrlevel ); |
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| 242 | user_callback = (void (*)(void))args->buffer; |
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| 243 | (void) set_vector( User_Clock_isr, CLOCK_VECTOR, 1 ); |
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| 244 | rtems_interrupt_enable( isrlevel ); |
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| 245 | } |
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| 246 | |
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| 247 | done: |
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| 248 | return RTEMS_SUCCESSFUL; |
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| 249 | } |
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