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rename CFG_ macros to CONFIG_SYS
[people/ms/u-boot.git] / drivers / rtc / m41t11.c
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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
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26/* #define DEBUG 1 */
27
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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
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43#endif
44*/
45
6d0f6bcf 46#if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE)
affae2bf 47
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48static unsigned bcd2bin (uchar n)
49{
50 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
51}
52
53static 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
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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*/
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86#ifndef CONFIG_SYS_M41T11_BASE_YEAR
87#define CONFIG_SYS_M41T11_BASE_YEAR 2000
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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 99int 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
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106 if( data[RTC_SEC_ADDR] & 0x80 ){
107 printf( "m41t11 RTC Clock stopped!!!\n" );
b73a19e1 108 rel = -1;
8bde7f77 109 }
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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);
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115#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
116 tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR
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117 + bcd2bin(data[RTC_YEARS_ADDR])
118 + ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0);
affae2bf 119#else
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120 {
121 unsigned char cent;
6d0f6bcf 122 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
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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;
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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, &cent, M41T11_YEAR_SIZE);
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131 }
132 tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]);
133 }
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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);
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142
143 return rel;
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144}
145
d1e23194 146int rtc_set (struct rtc_time *tmp)
affae2bf 147{
8bde7f77 148 uchar data[RTC_REG_CNT];
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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*/
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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) ){
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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
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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, &cent, 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);
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179
180 return 0;
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181}
182
183void 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);
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194}
195
196int rtc_store(int addr, unsigned char* data, int size)
197{
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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 );
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202}
203
204int 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 );
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207}
208
068b60a0 209#endif