[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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| 23 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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| 24 | * On-Line Applications Research Corporation (OAR). |
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| 25 | * All rights assigned to U.S. Government, 1994. |
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| 26 | * |
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| 27 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 28 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 29 | * notice must appear in all copies of this file and its derivatives. |
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| 30 | * |
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| 31 | * ckinit.c,v 1.5 1995/10/30 21:53:23 joel Exp |
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| 32 | */ |
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| 33 | |
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| 34 | #ifndef lint |
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| 35 | static char _sccsid[] = "@(#)ckinit.c 08/20/96 1.3\n"; |
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| 36 | #endif |
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| 37 | |
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| 38 | #include <stdlib.h> |
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| 39 | |
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| 40 | #include <rtems.h> |
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| 41 | #include <rtems/libio.h> |
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| 42 | #include <bsp.h> |
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| 43 | |
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[b944007b] | 44 | #define EXT_INT5 0x8000 /* external interrupt 5 */ |
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[f198c63] | 45 | |
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| 46 | #include "clock.h" |
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| 47 | |
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| 48 | #define CLOCKS_PER_MICROSECOND ( CPU_CLOCK_RATE_MHZ ) /* equivalent to CPU clock speed in MHz */ |
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| 49 | |
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| 50 | void Clock_exit( void ); |
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| 51 | rtems_isr Clock_isr( rtems_vector_number vector ); |
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| 52 | |
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| 53 | |
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| 54 | /* |
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| 55 | * The interrupt vector number associated with the clock tick device |
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| 56 | * driver. |
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| 57 | */ |
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| 58 | |
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| 59 | #define CLOCK_VECTOR_MASK EXT_INT5 |
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| 60 | #define CLOCK_VECTOR 0x7 |
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| 61 | |
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| 62 | /* |
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| 63 | * Clock_driver_ticks is a monotonically increasing counter of the |
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| 64 | * number of clock ticks since the driver was initialized. |
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| 65 | */ |
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| 66 | |
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| 67 | volatile rtems_unsigned32 Clock_driver_ticks; |
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| 68 | |
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| 69 | /* |
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| 70 | * Clock_isrs is the number of clock ISRs until the next invocation of |
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| 71 | * the RTEMS clock tick routine. The clock tick device driver |
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| 72 | * gets an interrupt once a millisecond and counts down until the |
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| 73 | * length of time between the user configured microseconds per tick |
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| 74 | * has passed. |
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| 75 | */ |
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| 76 | |
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| 77 | rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ |
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| 78 | |
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| 79 | /* |
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| 80 | * These are set by clock driver during its init |
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| 81 | */ |
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| 82 | |
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| 83 | rtems_device_major_number rtems_clock_major = ~0; |
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| 84 | rtems_device_minor_number rtems_clock_minor; |
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| 85 | |
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| 86 | /* |
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| 87 | * The previous ISR on this clock tick interrupt vector. |
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| 88 | */ |
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| 89 | |
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| 90 | rtems_isr_entry Old_ticker; |
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| 91 | |
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| 92 | void Clock_exit( void ); |
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| 93 | |
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| 94 | static unsigned32 mips_timer_rate = 0; |
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| 95 | |
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| 96 | /* |
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| 97 | * Isr Handler |
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| 98 | */ |
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| 99 | |
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| 100 | rtems_isr Clock_isr( |
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| 101 | rtems_vector_number vector |
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| 102 | ) |
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| 103 | { |
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| 104 | /* |
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| 105 | * bump the number of clock driver ticks since initialization |
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| 106 | * |
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| 107 | * determine if it is time to announce the passing of tick as configured |
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| 108 | * to RTEMS through the rtems_clock_tick directive |
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| 109 | * |
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| 110 | * perform any timer dependent tasks |
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| 111 | */ |
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| 112 | |
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| 113 | /* refresh the internal CPU timer */ |
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| 114 | mips_set_timer( mips_timer_rate ); |
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| 115 | |
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| 116 | Clock_driver_ticks += 1; |
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| 117 | |
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| 118 | rtems_clock_tick(); |
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| 119 | } |
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| 120 | |
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| 121 | /* User callback shell (set from Clock_Control) */ |
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| 122 | static void (*user_callback)(void); |
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| 123 | |
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| 124 | rtems_isr User_Clock_isr( |
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| 125 | rtems_vector_number vector |
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| 126 | ) |
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| 127 | { |
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| 128 | /* refresh the internal CPU timer */ |
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| 129 | mips_set_timer( mips_timer_rate ); |
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| 130 | |
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| 131 | if (user_callback) |
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| 132 | user_callback(); |
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| 133 | } |
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| 134 | |
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| 135 | /* |
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| 136 | * Install_clock |
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| 137 | * |
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| 138 | * Install a clock tick handleR and reprograms the chip. This |
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| 139 | * is used to initially establish the clock tick. |
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| 140 | */ |
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| 141 | |
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| 142 | void Install_clock( |
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| 143 | rtems_isr_entry clock_isr |
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| 144 | ) |
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| 145 | { |
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| 146 | /* |
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| 147 | * Initialize the clock tick device driver variables |
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| 148 | */ |
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| 149 | |
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| 150 | Clock_driver_ticks = 0; |
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| 151 | Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; |
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| 152 | |
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| 153 | /* |
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| 154 | * If ticks_per_timeslice is configured as non-zero, then the user |
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| 155 | * wants a clock tick. |
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| 156 | */ |
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| 157 | |
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| 158 | if ( BSP_Configuration.ticks_per_timeslice ) { |
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| 159 | Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); |
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| 160 | /* |
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| 161 | * Hardware specific initialize goes here |
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| 162 | */ |
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| 163 | |
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| 164 | mips_timer_rate = BSP_Configuration.microseconds_per_tick * CLOCKS_PER_MICROSECOND; |
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| 165 | mips_set_timer( mips_timer_rate ); |
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| 166 | enable_int(CLOCK_VECTOR_MASK); |
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| 167 | } |
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| 168 | |
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| 169 | /* |
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| 170 | * Schedule the clock cleanup routine to execute if the application exits. |
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| 171 | */ |
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| 172 | |
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| 173 | atexit( Clock_exit ); |
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| 174 | } |
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| 175 | |
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| 176 | /* |
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| 177 | * Clean up before the application exits |
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| 178 | */ |
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| 179 | |
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| 180 | void Clock_exit( void ) |
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| 181 | { |
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| 182 | if ( BSP_Configuration.ticks_per_timeslice ) { |
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| 183 | |
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| 184 | /* mips: turn off the timer interrupts */ |
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| 185 | disable_int(CLOCK_VECTOR_MASK); |
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| 186 | |
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| 187 | } |
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| 188 | } |
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| 189 | |
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| 190 | /* |
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| 191 | * Clock_initialize |
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| 192 | * |
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| 193 | * Device driver entry point for clock tick driver initialization. |
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| 194 | */ |
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| 195 | |
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| 196 | rtems_device_driver Clock_initialize( |
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| 197 | rtems_device_major_number major, |
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| 198 | rtems_device_minor_number minor, |
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| 199 | void *pargp |
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| 200 | ) |
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| 201 | { |
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| 202 | Install_clock( Clock_isr ); |
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| 203 | |
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| 204 | /* |
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| 205 | * make major/minor avail to others such as shared memory driver |
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| 206 | */ |
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| 207 | |
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| 208 | rtems_clock_major = major; |
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| 209 | rtems_clock_minor = minor; |
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| 210 | |
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| 211 | return RTEMS_SUCCESSFUL; |
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| 212 | } |
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| 213 | |
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| 214 | rtems_device_driver Clock_control( |
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| 215 | rtems_device_major_number major, |
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| 216 | rtems_device_minor_number minor, |
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| 217 | void *pargp |
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| 218 | ) |
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| 219 | { |
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| 220 | rtems_unsigned32 isrlevel; |
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| 221 | rtems_libio_ioctl_args_t *args = pargp; |
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| 222 | |
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| 223 | if (args == 0) |
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| 224 | goto done; |
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| 225 | |
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| 226 | /* |
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| 227 | * This is hokey, but until we get a defined interface |
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| 228 | * to do this, it will just be this simple... |
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| 229 | */ |
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| 230 | |
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| 231 | if (args->command == rtems_build_name('I', 'S', 'R', ' ')) |
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| 232 | { |
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| 233 | Clock_isr(CLOCK_VECTOR); |
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| 234 | } |
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| 235 | else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) |
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| 236 | { |
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| 237 | rtems_interrupt_disable( isrlevel ); |
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| 238 | user_callback = (void (*)(void))args->buffer; |
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| 239 | (void) set_vector( User_Clock_isr, CLOCK_VECTOR, 1 ); |
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| 240 | rtems_interrupt_enable( isrlevel ); |
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| 241 | } |
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| 242 | |
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| 243 | done: |
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| 244 | return RTEMS_SUCCESSFUL; |
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| 245 | } |
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