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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2018
- * Lukasz Majewski, DENX Software Engineering, lukma@denx.de.
- *
- * (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 <dm.h>
- #include <log.h>
- #include <rtc.h>
- #include <i2c.h>
- #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 */
- static void m41t62_update_rtc_time(struct rtc_time *tm, u8 *buf)
- {
- 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);
- }
- static void m41t62_set_rtc_buf(const struct rtc_time *tm, u8 *buf)
- {
- 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);
- /* 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);
- }
- #ifdef CONFIG_DM_RTC
- static int m41t62_rtc_get(struct udevice *dev, struct rtc_time *tm)
- {
- u8 buf[M41T62_DATETIME_REG_SIZE];
- int ret;
- ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
- if (ret)
- return ret;
- m41t62_update_rtc_time(tm, buf);
- return 0;
- }
- static int m41t62_rtc_set(struct udevice *dev, const struct rtc_time *tm)
- {
- u8 buf[M41T62_DATETIME_REG_SIZE];
- int ret;
- ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
- if (ret)
- return ret;
- m41t62_set_rtc_buf(tm, buf);
- ret = dm_i2c_write(dev, 0, buf, sizeof(buf));
- if (ret) {
- printf("I2C write failed in %s()\n", __func__);
- return ret;
- }
- return 0;
- }
- static int m41t62_rtc_reset(struct udevice *dev)
- {
- u8 val;
- /*
- * M41T82: Make sure HT (Halt Update) bit is cleared.
- * This bit is 0 in M41T62 so its save to clear it always.
- */
- int ret = dm_i2c_read(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val));
- val &= ~M41T80_ALHOUR_HT;
- ret |= dm_i2c_write(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val));
- return ret;
- }
- /*
- * Make sure HT bit is cleared. This bit is set on entering battery backup
- * mode, so do this before the first read access.
- */
- static int m41t62_rtc_probe(struct udevice *dev)
- {
- return m41t62_rtc_reset(dev);
- }
- static const struct rtc_ops m41t62_rtc_ops = {
- .get = m41t62_rtc_get,
- .set = m41t62_rtc_set,
- .reset = m41t62_rtc_reset,
- };
- static const struct udevice_id m41t62_rtc_ids[] = {
- { .compatible = "st,m41t62" },
- { .compatible = "st,m41t82" },
- { .compatible = "st,m41st87" },
- { .compatible = "microcrystal,rv4162" },
- { }
- };
- U_BOOT_DRIVER(rtc_m41t62) = {
- .name = "rtc-m41t62",
- .id = UCLASS_RTC,
- .of_match = m41t62_rtc_ids,
- .ops = &m41t62_rtc_ops,
- .probe = &m41t62_rtc_probe,
- };
- #else /* NON DM RTC code - will be removed */
- 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);
- m41t62_update_rtc_time(tm, buf);
- return 0;
- }
- int rtc_set(struct rtc_time *tm)
- {
- u8 buf[M41T62_DATETIME_REG_SIZE];
- i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
- m41t62_set_rtc_buf(tm, buf);
- 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 /* CONFIG_DM_RTC */
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