[486c329] | 1 | /* Clock_init() |
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| 2 | * |
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| 3 | * This routine initializes the DP8570A periodic interrupt on the |
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| 4 | * efi68k board. The tick frequency is 1 millisecond. |
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| 5 | * |
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| 6 | * Input parameters: NONE |
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| 7 | * |
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| 8 | * Output parameters: NONE |
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| 9 | * |
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| 10 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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| 11 | * On-Line Applications Research Corporation (OAR). |
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| 12 | * All rights assigned to U.S. Government, 1994. |
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| 13 | * |
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| 14 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 15 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 16 | * notice must appear in all copies of this file and its derivatives. |
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| 17 | * |
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| 18 | * $Id$ |
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| 19 | */ |
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| 20 | |
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| 21 | #include <stdlib.h> |
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| 22 | #include <bsp.h> |
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| 23 | #include <rtems/libio.h> |
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| 24 | |
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| 25 | #define CLOCK_VECTOR (TCP_ISR_LEVEL+24) |
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| 26 | |
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| 27 | rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ |
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| 28 | volatile rtems_unsigned32 Clock_driver_ticks; |
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| 29 | /* ticks since initialization */ |
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| 30 | rtems_isr_entry Old_ticker; |
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| 31 | |
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| 32 | void Clock_exit( void ); |
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| 33 | |
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| 34 | /* |
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| 35 | * These are set by clock driver during its init |
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| 36 | */ |
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| 37 | |
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| 38 | rtems_device_major_number rtems_clock_major = ~0; |
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| 39 | rtems_device_minor_number rtems_clock_minor; |
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| 40 | |
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| 41 | |
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| 42 | void per_interrupt(void) |
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| 43 | { |
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| 44 | Clock_driver_ticks += 1; |
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| 45 | |
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| 46 | *MSR = PER; |
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| 47 | |
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| 48 | if ( Clock_isrs == 1 ) { |
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| 49 | rtems_clock_tick(); |
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| 50 | Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; |
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| 51 | } |
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| 52 | else |
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| 53 | Clock_isrs -= 1; |
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| 54 | } |
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| 55 | |
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| 56 | rtems_isr Clock_isr( |
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| 57 | rtems_vector_number vector |
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| 58 | ) |
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| 59 | { |
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| 60 | unsigned char entry_msr, msr; |
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| 61 | |
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| 62 | entry_msr = *MSR; |
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| 63 | *MSR = 0; |
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| 64 | while ( (msr=*MSR) & INT ) |
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| 65 | /* test enabled interrupt bits */ |
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| 66 | if (msr & PER) |
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| 67 | per_interrupt(); |
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| 68 | else if (msr & T0) { |
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| 69 | *MSR = T0; /* reset interrupt */ |
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| 70 | Timer_interrupts++; /* inc wrap around counter */ |
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| 71 | } |
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| 72 | else |
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| 73 | /* there has been an error if we reach this point */ |
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| 74 | /* default action: reset all the interrupts */ |
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| 75 | *MSR = ( PER | AL | T0 | T1 ); |
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| 76 | *MSR = entry_msr & (RS | PS); |
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| 77 | } |
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| 78 | |
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| 79 | void Install_clock( |
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| 80 | rtems_isr_entry clock_isr |
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| 81 | ) |
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| 82 | { |
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| 83 | Clock_driver_ticks = 0; |
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| 84 | Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; |
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| 85 | |
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| 86 | if ( BSP_Configuration.ticks_per_timeslice ) { |
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| 87 | Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); |
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| 88 | |
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| 89 | *MSR = RS; /* enable 1mS interrupts */ |
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| 90 | *ICR0 |= OME; |
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| 91 | |
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| 92 | atexit( Clock_exit ); |
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| 93 | } |
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| 94 | } |
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| 95 | |
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| 96 | void ReInstall_clock( |
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| 97 | rtems_isr_entry clock_isr |
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| 98 | ) |
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| 99 | { |
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| 100 | rtems_unsigned32 isrlevel = 0 ; |
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| 101 | |
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| 102 | rtems_interrupt_disable( isrlevel ); |
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| 103 | (void) set_vector( clock_isr, CLOCK_VECTOR, 1 ); |
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| 104 | rtems_interrupt_enable( isrlevel ); |
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| 105 | } |
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| 106 | |
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| 107 | void Clock_exit( void ) |
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| 108 | { |
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| 109 | |
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| 110 | if ( BSP_Configuration.ticks_per_timeslice ) { |
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| 111 | |
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| 112 | /* shutdown periodic interrupt */ |
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| 113 | *MSR = RS; |
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| 114 | *ICR0 &= 0xc0; |
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| 115 | /* do not restore old vector */ |
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| 116 | |
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| 117 | } |
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| 118 | } |
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| 119 | |
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| 120 | rtems_device_driver Clock_initialize( |
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| 121 | rtems_device_major_number major, |
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| 122 | rtems_device_minor_number minor, |
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| 123 | void *pargp |
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| 124 | ) |
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| 125 | { |
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| 126 | Install_clock( Clock_isr ); |
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| 127 | |
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| 128 | /* |
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| 129 | * make major/minor avail to others such as shared memory driver |
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| 130 | */ |
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| 131 | |
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| 132 | rtems_clock_major = major; |
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| 133 | rtems_clock_minor = minor; |
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| 134 | |
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| 135 | return RTEMS_SUCCESSFUL; |
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| 136 | } |
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| 137 | |
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| 138 | rtems_device_driver Clock_control( |
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| 139 | rtems_device_major_number major, |
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| 140 | rtems_device_minor_number minor, |
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| 141 | void *pargp |
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| 142 | ) |
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| 143 | { |
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| 144 | rtems_libio_ioctl_args_t *args = pargp; |
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| 145 | |
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| 146 | if (args == 0) |
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| 147 | goto done; |
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| 148 | |
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| 149 | /* |
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| 150 | * This is hokey, but until we get a defined interface |
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| 151 | * to do this, it will just be this simple... |
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| 152 | */ |
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| 153 | |
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| 154 | if (args->command == rtems_build_name('I', 'S', 'R', ' ')) |
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| 155 | { |
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| 156 | Clock_isr(CLOCK_VECTOR); |
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| 157 | } |
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| 158 | else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) |
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| 159 | { |
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| 160 | ReInstall_clock(args->buffer); |
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| 161 | } |
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| 162 | |
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| 163 | done: |
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| 164 | return RTEMS_SUCCESSFUL; |
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| 165 | } |
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