1 /* 2 * (C) Copyright 2010 3 * Heiko Schocher, DENX Software Engineering, hs@denx.de 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 #include <common.h> 24 #include <command.h> 25 #include <i2c.h> 26 #include <rtc.h> 27 28 #define RTC_RV3029_CTRL_RESET 0x04 29 #define RTC_RV3029_CTRL_SYS_R (1 << 4) 30 31 #define RTC_RV3029_CLOCK_PAGE 0x08 32 #define RTC_RV3029_PAGE_LEN 7 33 34 #define RV3029C2_W_SECONDS 0x00 35 #define RV3029C2_W_MINUTES 0x01 36 #define RV3029C2_W_HOURS 0x02 37 #define RV3029C2_W_DATE 0x03 38 #define RV3029C2_W_DAYS 0x04 39 #define RV3029C2_W_MONTHS 0x05 40 #define RV3029C2_W_YEARS 0x06 41 42 #define RV3029C2_REG_HR_12_24 (1 << 6) /* 24h/12h mode */ 43 #define RV3029C2_REG_HR_PM (1 << 5) /* PM/AM bit in 12h mode */ 44 45 int rtc_get( struct rtc_time *tmp ) 46 { 47 int ret; 48 unsigned char buf[RTC_RV3029_PAGE_LEN]; 49 50 ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, \ 51 RTC_RV3029_PAGE_LEN); 52 if (ret) { 53 printf("%s: error reading RTC: %x\n", __func__, ret); 54 return -1; 55 } 56 tmp->tm_sec = bcd2bin( buf[RV3029C2_W_SECONDS] & 0x7f); 57 tmp->tm_min = bcd2bin( buf[RV3029C2_W_MINUTES] & 0x7f); 58 if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_12_24) { 59 /* 12h format */ 60 tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x1f); 61 if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_PM) 62 /* PM flag set */ 63 tmp->tm_hour += 12; 64 } else 65 tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x3f); 66 67 tmp->tm_mday = bcd2bin( buf[RV3029C2_W_DATE] & 0x3F ); 68 tmp->tm_mon = bcd2bin( buf[RV3029C2_W_MONTHS] & 0x1F ); 69 tmp->tm_wday = bcd2bin( buf[RV3029C2_W_DAYS] & 0x07 ); 70 /* RTC supports only years > 1999 */ 71 tmp->tm_year = bcd2bin( buf[RV3029C2_W_YEARS]) + 2000; 72 tmp->tm_yday = 0; 73 tmp->tm_isdst = 0; 74 75 #ifdef RTC_DEBUG 76 printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 77 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 78 tmp->tm_hour, tmp->tm_min, tmp->tm_sec ); 79 80 #endif 81 return 0; 82 } 83 84 int rtc_set( struct rtc_time *tmp ) 85 { 86 int ret; 87 unsigned char buf[RTC_RV3029_PAGE_LEN]; 88 #ifdef RTC_DEBUG 89 printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 90 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 91 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 92 #endif 93 94 if (tmp->tm_year < 2000) { 95 printf("RTC: year %d < 2000 not possible\n", tmp->tm_year); 96 return -1; 97 } 98 buf[RV3029C2_W_SECONDS] = bin2bcd(tmp->tm_sec); 99 buf[RV3029C2_W_MINUTES] = bin2bcd(tmp->tm_min); 100 buf[RV3029C2_W_HOURS] = bin2bcd(tmp->tm_hour); 101 /* set 24h format */ 102 buf[RV3029C2_W_HOURS] &= ~RV3029C2_REG_HR_12_24; 103 buf[RV3029C2_W_DATE] = bin2bcd(tmp->tm_mday); 104 buf[RV3029C2_W_DAYS] = bin2bcd(tmp->tm_wday); 105 buf[RV3029C2_W_MONTHS] = bin2bcd(tmp->tm_mon); 106 tmp->tm_year -= 2000; 107 buf[RV3029C2_W_YEARS] = bin2bcd(tmp->tm_year); 108 ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, 109 buf, RTC_RV3029_PAGE_LEN); 110 111 /* give the RTC some time to update */ 112 udelay(1000); 113 return 0; 114 } 115 116 void rtc_reset (void) 117 { 118 int ret; 119 unsigned char buf[RTC_RV3029_PAGE_LEN]; 120 121 buf[0] = RTC_RV3029_CTRL_SYS_R; 122 ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_RESET, 1, 123 buf, 1); 124 } 125