[1177cda] | 1 | /* |
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| 2 | * This file interfaces with the real-time clock found in |
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| 3 | * a Harris ICM7170 |
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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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[1177cda] | 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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| 21 | * http://www.OARcorp.com/rtems/license.html. |
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| 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/icm7170.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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| 34 | /* XXX */ |
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| 35 | |
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| 36 | /* |
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| 37 | * icm7170_initialize |
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| 38 | */ |
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| 39 | |
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| 40 | void icm7170_initialize( |
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| 41 | int minor |
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| 42 | ) |
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| 43 | { |
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| 44 | unsigned32 icm7170; |
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| 45 | setRegister_f setReg; |
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| 46 | unsigned32 clock; |
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| 47 | |
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| 48 | icm7170 = RTC_Table[ minor ].ulCtrlPort1; |
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| 49 | setReg = RTC_Table[ minor ].setRegister; |
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| 50 | |
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| 51 | /* |
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| 52 | * Initialize the RTC with the proper clock frequency |
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| 53 | */ |
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| 54 | |
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| 55 | clock = (unsigned32) RTC_Table[ minor ].pDeviceParams; |
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| 56 | (*setReg)( icm7170, ICM7170_CONTROL, 0x0c | clock ); |
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| 57 | } |
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| 58 | |
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| 59 | /* |
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| 60 | * icm7170_get_time |
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| 61 | */ |
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| 62 | |
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| 63 | int icm7170_get_time( |
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| 64 | int minor, |
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| 65 | rtems_time_of_day *time |
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| 66 | ) |
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| 67 | { |
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| 68 | unsigned32 icm7170; |
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| 69 | getRegister_f getReg; |
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| 70 | setRegister_f setReg; |
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| 71 | unsigned32 year; |
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| 72 | |
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| 73 | icm7170 = RTC_Table[ minor ].ulCtrlPort1; |
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| 74 | getReg = RTC_Table[ minor ].getRegister; |
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| 75 | setReg = RTC_Table[ minor ].setRegister; |
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| 76 | |
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| 77 | /* |
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| 78 | * Put the RTC into read mode |
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| 79 | */ |
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| 80 | |
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| 81 | (void) (*getReg)( icm7170, ICM7170_COUNTER_HUNDREDTHS ); |
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| 82 | |
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| 83 | /* |
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| 84 | * Now get the time |
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| 85 | */ |
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| 86 | |
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| 87 | |
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| 88 | year = (*getReg)( icm7170, ICM7170_YEAR ); |
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| 89 | if ( year < 88 ) |
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| 90 | year += 2000; |
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| 91 | else |
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| 92 | year += 1900; |
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| 93 | |
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| 94 | time->year = year; |
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| 95 | time->month = (*getReg)( icm7170, ICM7170_MONTH ); |
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| 96 | time->day = (*getReg)( icm7170, ICM7170_DATE ); |
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| 97 | time->hour = (*getReg)( icm7170, ICM7170_HOUR ); |
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| 98 | time->minute = (*getReg)( icm7170, ICM7170_MINUTE ); |
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| 99 | time->second = (*getReg)( icm7170, ICM7170_SECOND ); |
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| 100 | |
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| 101 | time->ticks = 0; |
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| 102 | |
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| 103 | /* |
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| 104 | * Put the RTC back into normal mode. |
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| 105 | */ |
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| 106 | |
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| 107 | (void) (*getReg)( icm7170, ICM7170_COUNTER_HUNDREDTHS ); |
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| 108 | |
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| 109 | return 0; |
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| 110 | } |
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| 111 | |
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| 112 | /* |
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| 113 | * icm7170_set_time |
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| 114 | */ |
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| 115 | |
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| 116 | int icm7170_set_time( |
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| 117 | int minor, |
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| 118 | rtems_time_of_day *time |
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| 119 | ) |
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| 120 | { |
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| 121 | unsigned32 icm7170; |
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| 122 | getRegister_f getReg; |
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| 123 | setRegister_f setReg; |
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| 124 | unsigned32 year; |
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| 125 | unsigned32 clock; |
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| 126 | |
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| 127 | icm7170 = RTC_Table[ minor ].ulCtrlPort1; |
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| 128 | getReg = RTC_Table[ minor ].getRegister; |
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| 129 | setReg = RTC_Table[ minor ].setRegister; |
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| 130 | clock = (unsigned32) RTC_Table[ minor ].pDeviceParams; |
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| 131 | |
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| 132 | year = time->year; |
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| 133 | |
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| 134 | if ( year >= 2088 ) |
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| 135 | rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER ); |
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| 136 | |
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| 137 | if ( year >= 2000 ) |
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| 138 | year -= 2000; |
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| 139 | else |
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| 140 | year -= 1900; |
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| 141 | |
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| 142 | (*setReg)( icm7170, ICM7170_CONTROL, 0x04 | clock ); |
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| 143 | |
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| 144 | (*setReg)( icm7170, ICM7170_YEAR, year ); |
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| 145 | (*setReg)( icm7170, ICM7170_MONTH, time->month ); |
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| 146 | (*setReg)( icm7170, ICM7170_DATE, time->day ); |
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| 147 | (*setReg)( icm7170, ICM7170_HOUR, time->hour ); |
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| 148 | (*setReg)( icm7170, ICM7170_MINUTE, time->minute ); |
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| 149 | (*setReg)( icm7170, ICM7170_SECOND, time->second ); |
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| 150 | |
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| 151 | /* |
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| 152 | * This is not really right. |
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| 153 | */ |
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| 154 | |
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| 155 | (*setReg)( icm7170, ICM7170_DAY_OF_WEEK, 1 ); |
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| 156 | |
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| 157 | /* |
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| 158 | * Put the RTC back into normal mode. |
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| 159 | */ |
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| 160 | |
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| 161 | (*setReg)( icm7170, ICM7170_CONTROL, 0x0c | clock ); |
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| 162 | |
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| 163 | return 0; |
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| 164 | } |
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| 165 | |
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| 166 | /* |
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| 167 | * Driver function table |
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| 168 | */ |
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| 169 | |
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| 170 | rtc_fns icm7170_fns = { |
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| 171 | icm7170_initialize, |
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| 172 | icm7170_get_time, |
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| 173 | icm7170_set_time |
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| 174 | }; |
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| 175 | |
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