1 /* 2 * (C) Copyright 2007 3 * Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com. 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 /* 25 * Epson RX8025 RTC driver. 26 */ 27 28 #include <common.h> 29 #include <command.h> 30 #include <rtc.h> 31 #include <i2c.h> 32 33 #if defined(CONFIG_CMD_DATE) 34 35 /*---------------------------------------------------------------------*/ 36 #undef DEBUG_RTC 37 38 #ifdef DEBUG_RTC 39 #define DEBUGR(fmt,args...) printf(fmt ,##args) 40 #else 41 #define DEBUGR(fmt,args...) 42 #endif 43 /*---------------------------------------------------------------------*/ 44 45 #ifndef CONFIG_SYS_I2C_RTC_ADDR 46 # define CONFIG_SYS_I2C_RTC_ADDR 0x32 47 #endif 48 49 /* 50 * RTC register addresses 51 */ 52 #define RTC_SEC_REG_ADDR 0x00 53 #define RTC_MIN_REG_ADDR 0x01 54 #define RTC_HR_REG_ADDR 0x02 55 #define RTC_DAY_REG_ADDR 0x03 56 #define RTC_DATE_REG_ADDR 0x04 57 #define RTC_MON_REG_ADDR 0x05 58 #define RTC_YR_REG_ADDR 0x06 59 60 #define RTC_CTL1_REG_ADDR 0x0e 61 #define RTC_CTL2_REG_ADDR 0x0f 62 63 /* 64 * Control register 1 bits 65 */ 66 #define RTC_CTL1_BIT_2412 0x20 67 68 /* 69 * Control register 2 bits 70 */ 71 #define RTC_CTL2_BIT_PON 0x10 72 #define RTC_CTL2_BIT_VDET 0x40 73 #define RTC_CTL2_BIT_XST 0x20 74 #define RTC_CTL2_BIT_VDSL 0x80 75 76 /* 77 * Note: the RX8025 I2C RTC requires register 78 * reads and write to consist of a single bus 79 * cycle. It is not allowed to write the register 80 * address in a first cycle that is terminated by 81 * a STOP condition. The chips needs a 'restart' 82 * sequence (start sequence without a prior stop). 83 * This driver has been written for a 4xx board. 84 * U-Boot's 4xx i2c driver is currently not capable 85 * to generate such cycles to some work arounds 86 * are used. 87 */ 88 89 /* static uchar rtc_read (uchar reg); */ 90 #define rtc_read(reg) buf[((reg) + 1) & 0xf] 91 92 static void rtc_write (uchar reg, uchar val); 93 94 /* 95 * Get the current time from the RTC 96 */ 97 int rtc_get (struct rtc_time *tmp) 98 { 99 int rel = 0; 100 uchar sec, min, hour, mday, wday, mon, year, ctl2; 101 uchar buf[16]; 102 103 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16)) 104 printf("Error reading from RTC\n"); 105 106 sec = rtc_read(RTC_SEC_REG_ADDR); 107 min = rtc_read(RTC_MIN_REG_ADDR); 108 hour = rtc_read(RTC_HR_REG_ADDR); 109 wday = rtc_read(RTC_DAY_REG_ADDR); 110 mday = rtc_read(RTC_DATE_REG_ADDR); 111 mon = rtc_read(RTC_MON_REG_ADDR); 112 year = rtc_read(RTC_YR_REG_ADDR); 113 114 DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x " 115 "hr: %02x min: %02x sec: %02x\n", 116 year, mon, mday, wday, hour, min, sec); 117 118 /* dump status */ 119 ctl2 = rtc_read(RTC_CTL2_REG_ADDR); 120 if (ctl2 & RTC_CTL2_BIT_PON) { 121 printf("RTC: power-on detected\n"); 122 rel = -1; 123 } 124 125 if (ctl2 & RTC_CTL2_BIT_VDET) { 126 printf("RTC: voltage drop detected\n"); 127 rel = -1; 128 } 129 130 if (!(ctl2 & RTC_CTL2_BIT_XST)) { 131 printf("RTC: oscillator stop detected\n"); 132 rel = -1; 133 } 134 135 tmp->tm_sec = bcd2bin (sec & 0x7F); 136 tmp->tm_min = bcd2bin (min & 0x7F); 137 if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412) 138 tmp->tm_hour = bcd2bin (hour & 0x3F); 139 else 140 tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 + 141 ((hour & 0x20) ? 12 : 0); 142 tmp->tm_mday = bcd2bin (mday & 0x3F); 143 tmp->tm_mon = bcd2bin (mon & 0x1F); 144 tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000); 145 tmp->tm_wday = bcd2bin (wday & 0x07); 146 tmp->tm_yday = 0; 147 tmp->tm_isdst= 0; 148 149 DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 150 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 151 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 152 153 return rel; 154 } 155 156 /* 157 * Set the RTC 158 */ 159 int rtc_set (struct rtc_time *tmp) 160 { 161 DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 162 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 163 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 164 165 if (tmp->tm_year < 1970 || tmp->tm_year > 2069) 166 printf("WARNING: year should be between 1970 and 2069!\n"); 167 168 rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100)); 169 rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon)); 170 rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday)); 171 rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday)); 172 rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour)); 173 rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min)); 174 rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec)); 175 176 rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412); 177 178 return 0; 179 } 180 181 /* 182 * Reset the RTC. We setting the date back to 1970-01-01. 183 */ 184 void rtc_reset (void) 185 { 186 struct rtc_time tmp; 187 uchar buf[16]; 188 uchar ctl2; 189 190 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16)) 191 printf("Error reading from RTC\n"); 192 193 ctl2 = rtc_read(RTC_CTL2_REG_ADDR); 194 ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET); 195 ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL; 196 rtc_write (RTC_CTL2_REG_ADDR, ctl2); 197 198 tmp.tm_year = 1970; 199 tmp.tm_mon = 1; 200 tmp.tm_mday= 1; 201 tmp.tm_hour = 0; 202 tmp.tm_min = 0; 203 tmp.tm_sec = 0; 204 205 rtc_set(&tmp); 206 207 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n", 208 tmp.tm_year, tmp.tm_mon, tmp.tm_mday, 209 tmp.tm_hour, tmp.tm_min, tmp.tm_sec); 210 211 return; 212 } 213 214 /* 215 * Helper functions 216 */ 217 static void rtc_write (uchar reg, uchar val) 218 { 219 uchar buf[2]; 220 buf[0] = reg << 4; 221 buf[1] = val; 222 if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0) 223 printf("Error writing to RTC\n"); 224 225 } 226 227 #endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */ 228