// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2008 * Stefan Roese, DENX Software Engineering, sr@denx.de. * * based on a the Linux rtc-m41t80.c driver which is: * Alexander Bigga <ab@mycable.de>, 2006 (c) mycable GmbH */ /* * Date & Time support for STMicroelectronics M41T62 */ /* #define DEBUG */ #include <common.h> #include <command.h> #include <rtc.h> #include <i2c.h> #if defined(CONFIG_CMD_DATE) #define M41T62_REG_SSEC 0 #define M41T62_REG_SEC 1 #define M41T62_REG_MIN 2 #define M41T62_REG_HOUR 3 #define M41T62_REG_WDAY 4 #define M41T62_REG_DAY 5 #define M41T62_REG_MON 6 #define M41T62_REG_YEAR 7 #define M41T62_REG_ALARM_MON 0xa #define M41T62_REG_ALARM_DAY 0xb #define M41T62_REG_ALARM_HOUR 0xc #define M41T62_REG_ALARM_MIN 0xd #define M41T62_REG_ALARM_SEC 0xe #define M41T62_REG_FLAGS 0xf #define M41T62_DATETIME_REG_SIZE (M41T62_REG_YEAR + 1) #define M41T62_ALARM_REG_SIZE \ (M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON) #define M41T62_SEC_ST (1 << 7) /* ST: Stop Bit */ #define M41T62_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ #define M41T62_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ #define M41T62_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ #define M41T62_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ #define M41T62_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ #define M41T62_FEATURE_HT (1 << 0) #define M41T62_FEATURE_BL (1 << 1) #define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ int rtc_get(struct rtc_time *tm) { u8 buf[M41T62_DATETIME_REG_SIZE]; i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, " "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n", __FUNCTION__, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]); tm->tm_sec = bcd2bin(buf[M41T62_REG_SEC] & 0x7f); tm->tm_min = bcd2bin(buf[M41T62_REG_MIN] & 0x7f); tm->tm_hour = bcd2bin(buf[M41T62_REG_HOUR] & 0x3f); tm->tm_mday = bcd2bin(buf[M41T62_REG_DAY] & 0x3f); tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07; tm->tm_mon = bcd2bin(buf[M41T62_REG_MON] & 0x1f); /* assume 20YY not 19YY, and ignore the Century Bit */ /* U-Boot needs to add 1900 here */ tm->tm_year = bcd2bin(buf[M41T62_REG_YEAR]) + 100 + 1900; debug("%s: tm is secs=%d, mins=%d, hours=%d, " "mday=%d, mon=%d, year=%d, wday=%d\n", __FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); return 0; } int rtc_set(struct rtc_time *tm) { u8 buf[M41T62_DATETIME_REG_SIZE]; debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); /* Merge time-data and register flags into buf[0..7] */ buf[M41T62_REG_SSEC] = 0; buf[M41T62_REG_SEC] = bin2bcd(tm->tm_sec) | (buf[M41T62_REG_SEC] & ~0x7f); buf[M41T62_REG_MIN] = bin2bcd(tm->tm_min) | (buf[M41T62_REG_MIN] & ~0x7f); buf[M41T62_REG_HOUR] = bin2bcd(tm->tm_hour) | (buf[M41T62_REG_HOUR] & ~0x3f) ; buf[M41T62_REG_WDAY] = (tm->tm_wday & 0x07) | (buf[M41T62_REG_WDAY] & ~0x07); buf[M41T62_REG_DAY] = bin2bcd(tm->tm_mday) | (buf[M41T62_REG_DAY] & ~0x3f); buf[M41T62_REG_MON] = bin2bcd(tm->tm_mon) | (buf[M41T62_REG_MON] & ~0x1f); /* assume 20YY not 19YY */ buf[M41T62_REG_YEAR] = bin2bcd(tm->tm_year % 100); if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) { printf("I2C write failed in %s()\n", __func__); return -1; } return 0; } void rtc_reset(void) { u8 val; /* * M41T82: Make sure HT (Halt Update) bit is cleared. * This bit is 0 in M41T62 so its save to clear it always. */ i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1); val &= ~M41T80_ALHOUR_HT; i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1); } #endif