[a1f514f] | 1 | /* |
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| 2 | * This file interfaces with the real-time clock found in |
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| 3 | * a Mostek M48T08 or M48T18 or compatibles. |
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| 4 | * |
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| 5 | * Year 2K Notes: |
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| 6 | * |
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| 7 | * This chip only uses a two digit field to store the year. This |
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| 8 | * code uses the RTEMS Epoch as a pivot year. This lets us map the |
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| 9 | * two digit year field as follows: |
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| 10 | * |
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| 11 | * + two digit years 0-87 are mapped to 2000-2087. |
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| 12 | * + two digit years 88-99 are mapped to 1988-1999. |
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| 13 | * |
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| 14 | * This is less than the time span supported by RTEMS. |
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| 15 | * |
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[08311cc3] | 16 | * COPYRIGHT (c) 1989-1999. |
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[a1f514f] | 17 | * On-Line Applications Research Corporation (OAR). |
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| 18 | * |
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| 19 | * The license and distribution terms for this file may be |
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| 20 | * found in the file LICENSE in this distribution or at |
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[94365d9] | 21 | * http://www.rtems.com/license/LICENSE. |
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[a1f514f] | 22 | * |
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| 23 | * $Id$ |
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| 24 | */ |
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| 25 | |
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| 26 | #include <rtems.h> |
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| 27 | #include <libchip/rtc.h> |
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| 28 | #include <libchip/m48t08.h> |
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| 29 | |
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| 30 | /* |
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| 31 | * Control register bits |
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| 32 | */ |
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| 33 | |
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[cb5e6f68] | 34 | #define M48T08_CONTROL_WRITE 0x80 |
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| 35 | #define M48T08_CONTROL_READ 0x40 |
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| 36 | #define M48T08_CONTROL_SIGN 0x20 |
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[a1f514f] | 37 | |
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| 38 | /* |
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| 39 | * m48t08_initialize |
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| 40 | */ |
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| 41 | |
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| 42 | void m48t08_initialize( |
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| 43 | int minor |
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| 44 | ) |
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| 45 | { |
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| 46 | } |
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| 47 | |
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| 48 | /* |
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| 49 | * m48t08_get_time |
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| 50 | */ |
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| 51 | |
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| 52 | #define From_BCD( _x ) ((((_x) >> 4) * 10) + ((_x) & 0x0F)) |
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| 53 | #define To_BCD( _x ) ((((_x) / 10) << 4) + ((_x) % 10)) |
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| 54 | |
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| 55 | int m48t08_get_time( |
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| 56 | int minor, |
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| 57 | rtems_time_of_day *time |
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| 58 | ) |
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| 59 | { |
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[ee4f57d] | 60 | uint32_t m48t08; |
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[a1f514f] | 61 | getRegister_f getReg; |
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| 62 | setRegister_f setReg; |
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[ee4f57d] | 63 | uint8_t controlReg; |
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| 64 | uint32_t value1; |
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| 65 | uint32_t value2; |
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[a1f514f] | 66 | |
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[cb5e6f68] | 67 | m48t08 = RTC_Table[ minor ].ulCtrlPort1; |
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| 68 | getReg = RTC_Table[ minor ].getRegister; |
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| 69 | setReg = RTC_Table[ minor ].setRegister; |
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[a1f514f] | 70 | |
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| 71 | /* |
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| 72 | * Put the RTC into read mode |
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| 73 | */ |
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| 74 | |
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| 75 | controlReg = (*getReg)( m48t08, M48T08_CONTROL ); |
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[cb5e6f68] | 76 | (*setReg)( m48t08, M48T08_CONTROL, controlReg | M48T08_CONTROL_READ ); |
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[a1f514f] | 77 | |
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| 78 | value1 = (*getReg)( m48t08, M48T08_YEAR ); |
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| 79 | value2 = From_BCD( value1 ); |
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| 80 | if ( value2 < 88 ) |
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| 81 | time->year = 2000 + value2; |
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| 82 | else |
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| 83 | time->year = 1900 + value2; |
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| 84 | |
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| 85 | value1 = (*getReg)( m48t08, M48T08_MONTH ); |
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| 86 | time->month = From_BCD( value1 ); |
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| 87 | |
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| 88 | value1 = (*getReg)( m48t08, M48T08_DATE ); |
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| 89 | time->day = From_BCD( value1 ); |
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| 90 | |
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| 91 | value1 = (*getReg)( m48t08, M48T08_HOUR ); |
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| 92 | time->hour = From_BCD( value1 ); |
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| 93 | |
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| 94 | value1 = (*getReg)( m48t08, M48T08_MINUTE ); |
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| 95 | time->minute = From_BCD( value1 ); |
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| 96 | |
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| 97 | value1 = (*getReg)( m48t08, M48T08_SECOND ); |
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| 98 | time->second = From_BCD( value1 ); |
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| 99 | |
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[cb5e6f68] | 100 | time->ticks = 0; |
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| 101 | |
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[a1f514f] | 102 | /* |
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| 103 | * Put the RTC back into normal mode. |
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| 104 | */ |
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| 105 | |
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| 106 | (*setReg)( m48t08, M48T08_CONTROL, controlReg ); |
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| 107 | |
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| 108 | return 0; |
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| 109 | } |
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| 110 | |
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| 111 | /* |
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| 112 | * m48t08_set_time |
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| 113 | */ |
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| 114 | |
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| 115 | int m48t08_set_time( |
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| 116 | int minor, |
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| 117 | rtems_time_of_day *time |
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| 118 | ) |
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| 119 | { |
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[ee4f57d] | 120 | uint32_t m48t08; |
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[a1f514f] | 121 | getRegister_f getReg; |
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| 122 | setRegister_f setReg; |
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[ee4f57d] | 123 | uint8_t controlReg; |
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[a1f514f] | 124 | |
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[cb5e6f68] | 125 | m48t08 = RTC_Table[ minor ].ulCtrlPort1; |
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| 126 | getReg = RTC_Table[ minor ].getRegister; |
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| 127 | setReg = RTC_Table[ minor ].setRegister; |
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[a1f514f] | 128 | |
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| 129 | /* |
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| 130 | * Put the RTC into read mode |
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| 131 | */ |
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| 132 | |
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| 133 | controlReg = (*getReg)( m48t08, M48T08_CONTROL ); |
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[cb5e6f68] | 134 | (*setReg)( m48t08, M48T08_CONTROL, controlReg | M48T08_CONTROL_WRITE ); |
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[a1f514f] | 135 | |
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| 136 | if ( time->year >= 2088 ) |
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| 137 | rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER ); |
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| 138 | |
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| 139 | (*setReg)( m48t08, M48T08_YEAR, To_BCD(time->year % 100) ); |
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| 140 | (*setReg)( m48t08, M48T08_MONTH, To_BCD(time->month) ); |
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| 141 | (*setReg)( m48t08, M48T08_DATE, To_BCD(time->day) ); |
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| 142 | (*setReg)( m48t08, M48T08_HOUR, To_BCD(time->hour) ); |
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| 143 | (*setReg)( m48t08, M48T08_MINUTE, To_BCD(time->minute) ); |
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| 144 | (*setReg)( m48t08, M48T08_SECOND, To_BCD(time->second) ); |
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| 145 | |
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| 146 | /* |
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| 147 | * Put the RTC back into normal mode. |
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| 148 | */ |
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| 149 | |
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| 150 | (*setReg)( m48t08, M48T08_CONTROL, controlReg ); |
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| 151 | |
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| 152 | return 0; |
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| 153 | } |
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[cb5e6f68] | 154 | |
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| 155 | /* |
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| 156 | * Driver function table |
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| 157 | */ |
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| 158 | |
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| 159 | rtc_fns m48t08_fns = { |
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| 160 | m48t08_initialize, |
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| 161 | m48t08_get_time, |
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| 162 | m48t08_set_time |
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| 163 | }; |
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