root / prex-0.9.0 / bsp / drv / dev / rtc / mc146818.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2009, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * mc146818.c - mc146818 and compatible RTC
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32 | */
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33 | |||
34 | #include <sys/time.h> |
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35 | #include <sys/ioctl.h> |
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36 | |||
37 | #include <driver.h> |
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38 | #include <rtc.h> |
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39 | |||
40 | |||
41 | #define RTC_INDEX (CONFIG_MC146818_BASE + 0) |
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42 | #define RTC_DATA (CONFIG_MC146818_BASE + 1) |
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43 | |||
44 | #define RTC_SEC 0x00 |
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45 | #define RTC_MIN 0x02 |
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46 | #define RTC_HOUR 0x04 |
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47 | #define RTC_DOW 0x06 /* day of week */ |
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48 | #define RTC_DAY 0x07 |
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49 | #define RTC_MON 0x08 |
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50 | #define RTC_YEAR 0x09 |
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51 | #define RTC_STS_A 0x0a |
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52 | #define RTC_UIP 0x80 |
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53 | #define RTC_STS_B 0x0b |
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54 | #define RTC_BCD 0x04 |
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55 | |||
56 | static int mc146818_init(struct driver *); |
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57 | static int mc146818_gettime(void *, struct timeval *); |
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58 | static int mc146818_settime(void *, struct timeval *); |
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59 | |||
60 | |||
61 | struct driver mc146818_driver = {
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62 | /* name */ "mc146818", |
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63 | /* devops */ NULL, |
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64 | /* devsz */ 0, |
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65 | /* flags */ 0, |
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66 | /* probe */ NULL, |
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67 | /* init */ mc146818_init,
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68 | /* shutdown */ NULL, |
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69 | }; |
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70 | |||
71 | struct rtc_ops mc146818_ops = {
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72 | /* gettime */ mc146818_gettime,
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73 | /* settime */ mc146818_settime,
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74 | }; |
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75 | |||
76 | static u_char
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77 | mc_read(u_char index) |
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78 | { |
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79 | u_char val; |
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80 | int s;
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81 | |||
82 | s = splhigh(); |
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83 | bus_write_8(RTC_INDEX, index); |
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84 | val = bus_read_8(RTC_DATA); |
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85 | splx(s); |
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86 | return val;
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87 | } |
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88 | |||
89 | #if 0
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90 | static void
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91 | mc_write(u_char index, u_char val)
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92 | {
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93 | int s;
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94 | |||
95 | s = splhigh();
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96 | bus_write_8(RTC_INDEX, index);
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97 | bus_write_8(RTC_DATA, val);
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98 | splx(s);
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99 | }
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100 | #endif
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101 | |||
102 | static int |
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103 | mc146818_gettime(void *aux, struct timeval *tv) |
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104 | { |
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105 | struct clock_ymdhms cy;
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106 | int i;
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107 | |||
108 | /* Wait until data ready */
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109 | for (i = 0; i < 1000000; i++) |
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110 | if (!(mc_read(RTC_STS_A) & RTC_UIP))
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111 | break;
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112 | |||
113 | cy.nsec = 0;
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114 | cy.sec = mc_read(RTC_SEC); |
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115 | cy.min = mc_read(RTC_MIN); |
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116 | cy.hour = mc_read(RTC_HOUR); |
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117 | cy.dow = mc_read(RTC_DOW); |
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118 | cy.day = mc_read(RTC_DAY); |
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119 | cy.mon = mc_read(RTC_MON); |
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120 | cy.year = mc_read(RTC_YEAR); |
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121 | |||
122 | if (!(mc_read(RTC_STS_B) & RTC_BCD)) {
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123 | cy.sec = FROMBCD(cy.sec); |
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124 | cy.min = FROMBCD(cy.min); |
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125 | cy.hour = FROMBCD(cy.hour); |
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126 | cy.day = FROMBCD(cy.day); |
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127 | cy.mon = FROMBCD(cy.mon); |
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128 | cy.year = FROMBCD(cy.year); |
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129 | } |
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130 | if (cy.year < 80) |
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131 | cy.year += 2000;
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132 | else
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133 | cy.year += 1900;
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134 | #ifdef DEBUG
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135 | printf("rtc: system time was %d/%d/%d %d:%d:%d\n",
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136 | cy.year, cy.mon, cy.day, cy.hour, cy.min, cy.sec); |
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137 | #endif
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138 | tv->tv_usec = 0;
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139 | tv->tv_sec = rtc_ymdhms_to_secs(&cy); |
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140 | return 0; |
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141 | } |
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142 | |||
143 | static int |
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144 | mc146818_settime(void *aux, struct timeval *ts) |
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145 | { |
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146 | return 0; |
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147 | } |
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148 | |||
149 | static int |
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150 | mc146818_init(struct driver *self)
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151 | { |
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152 | |||
153 | rtc_attach(&mc146818_ops, NULL);
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154 | return 0; |
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155 | } |