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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16 | * COPYRIGHT (c) 1989-1999. |
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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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