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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 | static unsigned bcd2bin (uchar n) |
49 | { | |
50 | return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); | |
51 | } | |
52 | ||
53 | static unsigned char bin2bcd (unsigned int n) | |
54 | { | |
55 | return (((n / 10) << 4) | (n % 10)); | |
56 | } | |
57 | ||
58 | ||
59 | /* ------------------------------------------------------------------------- */ | |
60 | /* | |
61 | these are simple defines for the chip local to here so they aren't too | |
62 | verbose | |
63 | DAY/DATE aren't nice but that is how they are on the data sheet | |
64 | */ | |
65 | #define RTC_SEC_ADDR 0x0 | |
66 | #define RTC_MIN_ADDR 0x1 | |
67 | #define RTC_HOUR_ADDR 0x2 | |
68 | #define RTC_DAY_ADDR 0x3 | |
69 | #define RTC_DATE_ADDR 0x4 | |
70 | #define RTC_MONTH_ADDR 0x5 | |
71 | #define RTC_YEARS_ADDR 0x6 | |
72 | ||
73 | #define RTC_REG_CNT 7 | |
74 | ||
75 | #define RTC_CONTROL_ADDR 0x7 | |
76 | ||
77 | ||
6d0f6bcf | 78 | #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA |
affae2bf WD |
79 | |
80 | #define REG_CNT (RTC_REG_CNT+1) | |
81 | ||
82 | /* | |
83 | you only get 00-99 for the year we will asume you | |
84 | want from the year 2000 if you don't set the config | |
85 | */ | |
6d0f6bcf JCPV |
86 | #ifndef CONFIG_SYS_M41T11_BASE_YEAR |
87 | #define CONFIG_SYS_M41T11_BASE_YEAR 2000 | |
affae2bf WD |
88 | #endif |
89 | ||
90 | #else | |
91 | /* we will store extra year info in byte 9*/ | |
92 | #define M41T11_YEAR_DATA 0x8 | |
93 | #define M41T11_YEAR_SIZE 1 | |
94 | #define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE) | |
95 | #endif | |
96 | ||
97 | #define M41T11_STORAGE_SZ (64-REG_CNT) | |
98 | ||
b73a19e1 | 99 | int rtc_get (struct rtc_time *tmp) |
affae2bf | 100 | { |
b73a19e1 | 101 | int rel = 0; |
8bde7f77 | 102 | uchar data[RTC_REG_CNT]; |
affae2bf | 103 | |
6d0f6bcf | 104 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); |
affae2bf | 105 | |
8bde7f77 WD |
106 | if( data[RTC_SEC_ADDR] & 0x80 ){ |
107 | printf( "m41t11 RTC Clock stopped!!!\n" ); | |
b73a19e1 | 108 | rel = -1; |
8bde7f77 | 109 | } |
affae2bf WD |
110 | tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F); |
111 | tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F); | |
112 | tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F); | |
113 | tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F); | |
114 | tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F); | |
6d0f6bcf JCPV |
115 | #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA |
116 | tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR | |
8bde7f77 WD |
117 | + bcd2bin(data[RTC_YEARS_ADDR]) |
118 | + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0); | |
affae2bf | 119 | #else |
8bde7f77 WD |
120 | { |
121 | unsigned char cent; | |
6d0f6bcf | 122 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); |
8bde7f77 WD |
123 | if( !(data[RTC_HOUR_ADDR] & 0x80) ){ |
124 | printf( "m41t11 RTC: cann't keep track of years without CEB set\n" ); | |
b73a19e1 | 125 | rel = -1; |
8bde7f77 WD |
126 | } |
127 | if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){ | |
128 | /*century flip store off new year*/ | |
129 | cent += 1; | |
6d0f6bcf | 130 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); |
8bde7f77 WD |
131 | } |
132 | tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]); | |
133 | } | |
affae2bf WD |
134 | #endif |
135 | tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07); | |
136 | tmp->tm_yday = 0; | |
137 | tmp->tm_isdst= 0; | |
138 | ||
139 | debug ( "Get 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); | |
b73a19e1 YT |
142 | |
143 | return rel; | |
affae2bf WD |
144 | } |
145 | ||
d1e23194 | 146 | int rtc_set (struct rtc_time *tmp) |
affae2bf | 147 | { |
8bde7f77 | 148 | uchar data[RTC_REG_CNT]; |
affae2bf WD |
149 | |
150 | debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
151 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, | |
152 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); | |
153 | ||
154 | data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/*just in case*/ | |
155 | data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min); | |
156 | data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/ | |
157 | data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F; | |
158 | data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon); | |
159 | data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07; | |
160 | ||
8bde7f77 | 161 | data[RTC_HOUR_ADDR] |= 0x80;/*we will always use CEB*/ |
affae2bf | 162 | |
8bde7f77 | 163 | data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/*same thing either way*/ |
6d0f6bcf JCPV |
164 | #ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA |
165 | if( ((tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 200) || | |
166 | (tmp->tm_year < CONFIG_SYS_M41T11_BASE_YEAR) ){ | |
8bde7f77 WD |
167 | printf( "m41t11 RTC setting year out of range!!need recompile\n" ); |
168 | } | |
6d0f6bcf | 169 | data[RTC_HOUR_ADDR] |= (tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 100 ? 0x40 : 0; |
affae2bf | 170 | #else |
8bde7f77 WD |
171 | { |
172 | unsigned char cent; | |
173 | cent = tmp->tm_year ? tmp->tm_year / 100 : 0; | |
174 | data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0; | |
6d0f6bcf | 175 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, ¢, M41T11_YEAR_SIZE); |
8bde7f77 | 176 | } |
affae2bf | 177 | #endif |
6d0f6bcf | 178 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT); |
d1e23194 JCPV |
179 | |
180 | return 0; | |
affae2bf WD |
181 | } |
182 | ||
183 | void rtc_reset (void) | |
184 | { | |
8bde7f77 | 185 | unsigned char val; |
affae2bf | 186 | /* clear all control & status registers */ |
6d0f6bcf | 187 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1); |
8bde7f77 | 188 | val = val & 0x7F;/*make sure we are running*/ |
6d0f6bcf | 189 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT); |
affae2bf | 190 | |
6d0f6bcf | 191 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); |
8bde7f77 | 192 | val = val & 0x3F;/*turn off freq test keep calibration*/ |
6d0f6bcf | 193 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1); |
affae2bf WD |
194 | } |
195 | ||
196 | int rtc_store(int addr, unsigned char* data, int size) | |
197 | { | |
8bde7f77 WD |
198 | /*don't let things wrap onto the time on a write*/ |
199 | if( (addr+size) >= M41T11_STORAGE_SZ ) | |
200 | return 1; | |
6d0f6bcf | 201 | return i2c_write( CONFIG_SYS_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); |
affae2bf WD |
202 | } |
203 | ||
204 | int rtc_recall(int addr, unsigned char* data, int size) | |
205 | { | |
6d0f6bcf | 206 | return i2c_read( CONFIG_SYS_I2C_RTC_ADDR, REG_CNT+addr, 1, data, size ); |
affae2bf WD |
207 | } |
208 | ||
068b60a0 | 209 | #endif |