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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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/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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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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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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60 | unsigned32 m48t08; |
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61 | getRegister_f getReg; |
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62 | setRegister_f setReg; |
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63 | unsigned8 controlReg; |
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64 | unsigned32 value1; |
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65 | unsigned32 value2; |
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66 | |
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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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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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76 | (*setReg)( m48t08, M48T08_CONTROL, controlReg | M48T08_CONTROL_READ ); |
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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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100 | time->ticks = 0; |
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101 | |
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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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120 | unsigned32 m48t08; |
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121 | getRegister_f getReg; |
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122 | setRegister_f setReg; |
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123 | unsigned8 controlReg; |
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124 | |
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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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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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134 | (*setReg)( m48t08, M48T08_CONTROL, controlReg | M48T08_CONTROL_WRITE ); |
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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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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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164 | |
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