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affae2bf WD |
1 | /* |
2 | * (C) Copyright 2002 | |
3 | * Andrew May, Viasat Inc, amay@viasat.com | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License as | |
7 | * published by the Free Software Foundation; either version 2 of | |
8 | * the License, or (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
18 | * MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | /* | |
22 | * M41T11 Serial Access Timekeeper(R) SRAM | |
23 | * can you believe a trademark on that? | |
24 | */ | |
25 | ||
e6325153 WD |
26 | /* #define DEBUG 1 */ |
27 | ||
affae2bf WD |
28 | #include <common.h> |
29 | #include <command.h> | |
30 | #include <rtc.h> | |
31 | #include <i2c.h> | |
32 | ||
33 | /* | |
34 | I Don't have an example config file but this | |
35 | is what should be done. | |
36 | ||
37 | #define CONFIG_RTC_M41T11 1 | |
6d0f6bcf | 38 | #define CONFIG_SYS_I2C_RTC_ADDR 0x68 |
affae2bf | 39 | #if 0 |
6d0f6bcf | 40 | #define CONFIG_SYS_M41T11_EXT_CENTURY_DATA |
affae2bf | 41 | #else |
6d0f6bcf | 42 | #define CONFIG_SYS_M41T11_BASE_YEAR 2000 |
affae2bf WD |
43 | #endif |
44 | */ | |
45 | ||
6d0f6bcf | 46 | #if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE) |
affae2bf | 47 | |
affae2bf WD |
48 | /* ------------------------------------------------------------------------- */ |
49 | /* | |
50 | these are simple defines for the chip local to here so they aren't too | |
51 | verbose | |
52 | DAY/DATE aren't nice but that is how they are on the data sheet | |
53 | */ | |
54 | #define RTC_SEC_ADDR 0x0 | |
55 | #define RTC_MIN_ADDR 0x1 | |
56 | #define RTC_HOUR_ADDR 0x2 | |
57 | #define RTC_DAY_ADDR 0x3 | |
58 | #define RTC_DATE_ADDR 0x4 | |
59 | #define RTC_MONTH_ADDR 0x5 | |
60 | #define RTC_YEARS_ADDR 0x6 | |
61 | ||
62 | #define RTC_REG_CNT 7 | |
63 | ||
64 | #define RTC_CONTROL_ADDR 0x7 | |
65 | ||
66 | ||
6d0f6bcf | 67 | #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA |
affae2bf WD |
68 | |
69 | #define REG_CNT (RTC_REG_CNT+1) | |
70 | ||
71 | /* | |
72 | you only get 00-99 for the year we will asume you | |
73 | want from the year 2000 if you don't set the config | |
74 | */ | |
6d0f6bcf JCPV |
75 | #ifndef CONFIG_SYS_M41T11_BASE_YEAR |
76 | #define CONFIG_SYS_M41T11_BASE_YEAR 2000 | |
affae2bf WD |
77 | #endif |
78 | ||
79 | #else | |
80 | /* we will store extra year info in byte 9*/ | |
81 | #define M41T11_YEAR_DATA 0x8 | |
82 | #define M41T11_YEAR_SIZE 1 | |
83 | #define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE) | |
84 | #endif | |
85 | ||
86 | #define M41T11_STORAGE_SZ (64-REG_CNT) | |
87 | ||
b73a19e1 | 88 | int rtc_get (struct rtc_time *tmp) |
affae2bf | 89 | { |
b73a19e1 | 90 | int rel = 0; |
8bde7f77 | 91 | uchar data[RTC_REG_CNT]; |
affae2bf | 92 | |
6d0f6bcf | 93 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); |
affae2bf | 94 | |
8bde7f77 WD |
95 | if( data[RTC_SEC_ADDR] & 0x80 ){ |
96 | printf( "m41t11 RTC Clock stopped!!!\n" ); | |
b73a19e1 | 97 | rel = -1; |
8bde7f77 | 98 | } |
affae2bf WD |
99 | tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F); |
100 | tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F); | |
101 | tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F); | |
102 | tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F); | |
103 | tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F); | |
6d0f6bcf JCPV |
104 | #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA |
105 | tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR | |
8bde7f77 WD |
106 | + bcd2bin(data[RTC_YEARS_ADDR]) |
107 | + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0); | |
affae2bf | 108 | #else |
8bde7f77 WD |
109 | { |
110 | unsigned char cent; | |
6d0f6bcf | 111 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); |
8bde7f77 WD |
112 | if( !(data[RTC_HOUR_ADDR] & 0x80) ){ |
113 | printf( "m41t11 RTC: cann't keep track of years without CEB set\n" ); | |
b73a19e1 | 114 | rel = -1; |
8bde7f77 WD |
115 | } |
116 | if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){ | |
117 | /*century flip store off new year*/ | |
118 | cent += 1; | |
6d0f6bcf | 119 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); |
8bde7f77 WD |
120 | } |
121 | tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]); | |
122 | } | |
affae2bf WD |
123 | #endif |
124 | tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07); | |
125 | tmp->tm_yday = 0; | |
126 | tmp->tm_isdst= 0; | |
127 | ||
128 | debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
129 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, | |
130 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); | |
b73a19e1 YT |
131 | |
132 | return rel; | |
affae2bf WD |
133 | } |
134 | ||
d1e23194 | 135 | int rtc_set (struct rtc_time *tmp) |
affae2bf | 136 | { |
8bde7f77 | 137 | uchar data[RTC_REG_CNT]; |
affae2bf WD |
138 | |
139 | debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
140 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, | |
141 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); | |
142 | ||
143 | data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/ | |
144 | data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min); | |
145 | data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/ | |
146 | data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F; | |
147 | data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon); | |
148 | data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07; | |
149 | ||
8bde7f77 | 150 | data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/ |
affae2bf | 151 | |
8bde7f77 | 152 | data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/ |
6d0f6bcf JCPV |
153 | #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA |
154 | if( ((tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 200) || | |
155 | (tmp->tm_year < CONFIG_SYS_M41T11_BASE_YEAR) ){ | |
8bde7f77 WD |
156 | printf( "m41t11 RTC setting year out of range!!need recompile\n" ); |
157 | } | |
6d0f6bcf | 158 | data[RTC_HOUR_ADDR] |= (tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 100 ? 0x40 : 0; |
affae2bf | 159 | #else |
8bde7f77 WD |
160 | { |
161 | unsigned char cent; | |
162 | cent = tmp->tm_year ? tmp->tm_year / 100 : 0; | |
163 | data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0; | |
6d0f6bcf | 164 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); |
8bde7f77 | 165 | } |
affae2bf | 166 | #endif |
6d0f6bcf | 167 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); |
d1e23194 JCPV |
168 | |
169 | return 0; | |
affae2bf WD |
170 | } |
171 | ||
172 | void rtc_reset (void) | |
173 | { | |
8bde7f77 | 174 | unsigned char val; |
affae2bf | 175 | /* clear all control & status registers */ |
6d0f6bcf | 176 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1); |
8bde7f77 | 177 | val = val & 0x7F;/*make sure we are running*/ |
6d0f6bcf | 178 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT); |
affae2bf | 179 | |
6d0f6bcf | 180 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); |
8bde7f77 | 181 | val = val & 0x3F;/*turn off freq test keep calibration*/ |
6d0f6bcf | 182 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); |
affae2bf | 183 | } |
068b60a0 | 184 | #endif |