188aff62dSStefan Roese /* 288aff62dSStefan Roese * (C) Copyright 2008 388aff62dSStefan Roese * Stefan Roese, DENX Software Engineering, sr@denx.de. 488aff62dSStefan Roese * 588aff62dSStefan Roese * based on a the Linux rtc-m41t80.c driver which is: 688aff62dSStefan Roese * Alexander Bigga <ab@mycable.de>, 2006 (c) mycable GmbH 788aff62dSStefan Roese * 888aff62dSStefan Roese * This program is free software; you can redistribute it and/or 988aff62dSStefan Roese * modify it under the terms of the GNU General Public License as 1088aff62dSStefan Roese * published by the Free Software Foundation; either version 2 of 1188aff62dSStefan Roese * the License, or (at your option) any later version. 1288aff62dSStefan Roese * 1388aff62dSStefan Roese * This program is distributed in the hope that it will be useful, 1488aff62dSStefan Roese * but WITHOUT ANY WARRANTY; without even the implied warranty of 1588aff62dSStefan Roese * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1688aff62dSStefan Roese * GNU General Public License for more details. 1788aff62dSStefan Roese * 1888aff62dSStefan Roese * You should have received a copy of the GNU General Public License 1988aff62dSStefan Roese * along with this program; if not, write to the Free Software 2088aff62dSStefan Roese * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 2188aff62dSStefan Roese * MA 02111-1307 USA 2288aff62dSStefan Roese */ 2388aff62dSStefan Roese 2488aff62dSStefan Roese /* 2588aff62dSStefan Roese * Date & Time support for STMicroelectronics M41T62 2688aff62dSStefan Roese */ 2788aff62dSStefan Roese 2888aff62dSStefan Roese /* #define DEBUG */ 2988aff62dSStefan Roese 3088aff62dSStefan Roese #include <common.h> 3188aff62dSStefan Roese #include <command.h> 3288aff62dSStefan Roese #include <rtc.h> 3388aff62dSStefan Roese #include <i2c.h> 3488aff62dSStefan Roese #include <bcd.h> 3588aff62dSStefan Roese 3688aff62dSStefan Roese #if defined(CONFIG_CMD_DATE) 3788aff62dSStefan Roese 3888aff62dSStefan Roese #define M41T62_REG_SSEC 0 3988aff62dSStefan Roese #define M41T62_REG_SEC 1 4088aff62dSStefan Roese #define M41T62_REG_MIN 2 4188aff62dSStefan Roese #define M41T62_REG_HOUR 3 4288aff62dSStefan Roese #define M41T62_REG_WDAY 4 4388aff62dSStefan Roese #define M41T62_REG_DAY 5 4488aff62dSStefan Roese #define M41T62_REG_MON 6 4588aff62dSStefan Roese #define M41T62_REG_YEAR 7 4688aff62dSStefan Roese #define M41T62_REG_ALARM_MON 0xa 4788aff62dSStefan Roese #define M41T62_REG_ALARM_DAY 0xb 4888aff62dSStefan Roese #define M41T62_REG_ALARM_HOUR 0xc 4988aff62dSStefan Roese #define M41T62_REG_ALARM_MIN 0xd 5088aff62dSStefan Roese #define M41T62_REG_ALARM_SEC 0xe 5188aff62dSStefan Roese #define M41T62_REG_FLAGS 0xf 5288aff62dSStefan Roese 5388aff62dSStefan Roese #define M41T62_DATETIME_REG_SIZE (M41T62_REG_YEAR + 1) 5488aff62dSStefan Roese #define M41T62_ALARM_REG_SIZE \ 5588aff62dSStefan Roese (M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON) 5688aff62dSStefan Roese 5788aff62dSStefan Roese #define M41T62_SEC_ST (1 << 7) /* ST: Stop Bit */ 5888aff62dSStefan Roese #define M41T62_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ 5988aff62dSStefan Roese #define M41T62_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ 6088aff62dSStefan Roese #define M41T62_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ 6188aff62dSStefan Roese #define M41T62_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ 6288aff62dSStefan Roese #define M41T62_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ 6388aff62dSStefan Roese 6488aff62dSStefan Roese #define M41T62_FEATURE_HT (1 << 0) 6588aff62dSStefan Roese #define M41T62_FEATURE_BL (1 << 1) 6688aff62dSStefan Roese 67*b73a19e1SYuri Tikhonov int rtc_get(struct rtc_time *tm) 6888aff62dSStefan Roese { 6988aff62dSStefan Roese u8 buf[M41T62_DATETIME_REG_SIZE]; 7088aff62dSStefan Roese 7188aff62dSStefan Roese i2c_read(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); 7288aff62dSStefan Roese 7388aff62dSStefan Roese debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, " 7488aff62dSStefan Roese "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n", 7588aff62dSStefan Roese __FUNCTION__, 7688aff62dSStefan Roese buf[0], buf[1], buf[2], buf[3], 7788aff62dSStefan Roese buf[4], buf[5], buf[6], buf[7]); 7888aff62dSStefan Roese 7988aff62dSStefan Roese tm->tm_sec = BCD2BIN(buf[M41T62_REG_SEC] & 0x7f); 8088aff62dSStefan Roese tm->tm_min = BCD2BIN(buf[M41T62_REG_MIN] & 0x7f); 8188aff62dSStefan Roese tm->tm_hour = BCD2BIN(buf[M41T62_REG_HOUR] & 0x3f); 8288aff62dSStefan Roese tm->tm_mday = BCD2BIN(buf[M41T62_REG_DAY] & 0x3f); 8388aff62dSStefan Roese tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07; 8488aff62dSStefan Roese tm->tm_mon = BCD2BIN(buf[M41T62_REG_MON] & 0x1f) - 1; 8588aff62dSStefan Roese 8688aff62dSStefan Roese /* assume 20YY not 19YY, and ignore the Century Bit */ 8788aff62dSStefan Roese /* U-Boot needs to add 1900 here */ 8888aff62dSStefan Roese tm->tm_year = BCD2BIN(buf[M41T62_REG_YEAR]) + 100 + 1900; 8988aff62dSStefan Roese 9088aff62dSStefan Roese debug("%s: tm is secs=%d, mins=%d, hours=%d, " 9188aff62dSStefan Roese "mday=%d, mon=%d, year=%d, wday=%d\n", 9288aff62dSStefan Roese __FUNCTION__, 9388aff62dSStefan Roese tm->tm_sec, tm->tm_min, tm->tm_hour, 9488aff62dSStefan Roese tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 95*b73a19e1SYuri Tikhonov 96*b73a19e1SYuri Tikhonov return 0; 9788aff62dSStefan Roese } 9888aff62dSStefan Roese 9988aff62dSStefan Roese void rtc_set(struct rtc_time *tm) 10088aff62dSStefan Roese { 10188aff62dSStefan Roese u8 buf[M41T62_DATETIME_REG_SIZE]; 10288aff62dSStefan Roese 10388aff62dSStefan Roese debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 10488aff62dSStefan Roese tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, 10588aff62dSStefan Roese tm->tm_hour, tm->tm_min, tm->tm_sec); 10688aff62dSStefan Roese 10788aff62dSStefan Roese i2c_read(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); 10888aff62dSStefan Roese 10988aff62dSStefan Roese /* Merge time-data and register flags into buf[0..7] */ 11088aff62dSStefan Roese buf[M41T62_REG_SSEC] = 0; 11188aff62dSStefan Roese buf[M41T62_REG_SEC] = 11288aff62dSStefan Roese BIN2BCD(tm->tm_sec) | (buf[M41T62_REG_SEC] & ~0x7f); 11388aff62dSStefan Roese buf[M41T62_REG_MIN] = 11488aff62dSStefan Roese BIN2BCD(tm->tm_min) | (buf[M41T62_REG_MIN] & ~0x7f); 11588aff62dSStefan Roese buf[M41T62_REG_HOUR] = 11688aff62dSStefan Roese BIN2BCD(tm->tm_hour) | (buf[M41T62_REG_HOUR] & ~0x3f) ; 11788aff62dSStefan Roese buf[M41T62_REG_WDAY] = 11888aff62dSStefan Roese (tm->tm_wday & 0x07) | (buf[M41T62_REG_WDAY] & ~0x07); 11988aff62dSStefan Roese buf[M41T62_REG_DAY] = 12088aff62dSStefan Roese BIN2BCD(tm->tm_mday) | (buf[M41T62_REG_DAY] & ~0x3f); 12188aff62dSStefan Roese buf[M41T62_REG_MON] = 12288aff62dSStefan Roese BIN2BCD(tm->tm_mon + 1) | (buf[M41T62_REG_MON] & ~0x1f); 12388aff62dSStefan Roese /* assume 20YY not 19YY */ 12488aff62dSStefan Roese buf[M41T62_REG_YEAR] = BIN2BCD(tm->tm_year % 100); 12588aff62dSStefan Roese 12688aff62dSStefan Roese if (i2c_write(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) 12788aff62dSStefan Roese printf("I2C write failed in %s()\n", __func__); 12888aff62dSStefan Roese } 12988aff62dSStefan Roese 13088aff62dSStefan Roese void rtc_reset(void) 13188aff62dSStefan Roese { 13288aff62dSStefan Roese /* 13388aff62dSStefan Roese * Nothing to do 13488aff62dSStefan Roese */ 13588aff62dSStefan Roese } 13688aff62dSStefan Roese 13788aff62dSStefan Roese #endif 138