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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Date & Time support for Micro Crystal RV-8803-C7.
- *
- * based on ds1307.c which is
- * (C) Copyright 2001, 2002, 2003
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- * Keith Outwater, keith_outwater@mvis.com`
- * Steven Scholz, steven.scholz@imc-berlin.de
- *
- */
- #include <common.h>
- #include <command.h>
- #include <dm.h>
- #include <log.h>
- #include <rtc.h>
- #include <i2c.h>
- #include <linux/bitops.h>
- /*
- * RTC register addresses
- */
- #define RTC_SEC_REG_ADDR 0x00
- #define RTC_MIN_REG_ADDR 0x01
- #define RTC_HR_REG_ADDR 0x02
- #define RTC_DAY_REG_ADDR 0x03
- #define RTC_DATE_REG_ADDR 0x04
- #define RTC_MON_REG_ADDR 0x05
- #define RTC_YR_REG_ADDR 0x06
- #define RTC_FLAG_REG_ADDR 0x0E
- #define RTC_FLAG_BIT_V1F BIT(0)
- #define RTC_FLAG_BIT_V2F BIT(1)
- #define RTC_CTL_REG_ADDR 0x0F
- #define RTC_CTL_BIT_RST BIT(0)
- static int rv8803_rtc_set(struct udevice *dev, const struct rtc_time *tm)
- {
- int ret;
- u8 buf[7];
- 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);
- if (tm->tm_year < 2000 || tm->tm_year > 2099)
- printf("WARNING: year should be between 2000 and 2099!\n");
- buf[RTC_YR_REG_ADDR] = bin2bcd(tm->tm_year % 100);
- buf[RTC_MON_REG_ADDR] = bin2bcd(tm->tm_mon);
- buf[RTC_DAY_REG_ADDR] = 1 << (tm->tm_wday & 0x7);
- buf[RTC_DATE_REG_ADDR] = bin2bcd(tm->tm_mday);
- buf[RTC_HR_REG_ADDR] = bin2bcd(tm->tm_hour);
- buf[RTC_MIN_REG_ADDR] = bin2bcd(tm->tm_min);
- buf[RTC_SEC_REG_ADDR] = bin2bcd(tm->tm_sec);
- ret = dm_i2c_write(dev, 0, buf, sizeof(buf));
- if (ret < 0)
- return ret;
- return 0;
- }
- static int rv8803_rtc_get(struct udevice *dev, struct rtc_time *tm)
- {
- int ret;
- u8 buf[7];
- int flags;
- flags = dm_i2c_reg_read(dev, RTC_FLAG_REG_ADDR);
- if (flags < 0)
- return flags;
- debug("%s: flags=%Xh\n", __func__, flags);
- if (flags & RTC_FLAG_BIT_V1F)
- printf("### Warning: temperature compensation has stopped\n");
- if (flags & RTC_FLAG_BIT_V2F) {
- printf("### Warning: Voltage low, data is invalid\n");
- return -1;
- }
- ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
- if (ret < 0)
- return ret;
- tm->tm_sec = bcd2bin(buf[RTC_SEC_REG_ADDR] & 0x7F);
- tm->tm_min = bcd2bin(buf[RTC_MIN_REG_ADDR] & 0x7F);
- tm->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR] & 0x3F);
- tm->tm_mday = bcd2bin(buf[RTC_DATE_REG_ADDR] & 0x3F);
- tm->tm_mon = bcd2bin(buf[RTC_MON_REG_ADDR] & 0x1F);
- tm->tm_year = bcd2bin(buf[RTC_YR_REG_ADDR]) + 2000;
- tm->tm_wday = fls(buf[RTC_DAY_REG_ADDR] & 0x7F) - 1;
- tm->tm_yday = 0;
- tm->tm_isdst = 0;
- debug("Get 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);
- return 0;
- }
- static int rv8803_rtc_reset(struct udevice *dev)
- {
- int ret;
- struct rtc_time tmp = {
- .tm_year = 2000,
- .tm_mon = 1,
- .tm_mday = 1,
- .tm_hour = 0,
- .tm_min = 0,
- .tm_sec = 0,
- };
- /* assert reset */
- ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR, RTC_CTL_BIT_RST);
- if (ret < 0)
- return ret;
- /* clear all flags */
- ret = dm_i2c_reg_write(dev, RTC_FLAG_REG_ADDR, 0);
- if (ret < 0)
- return ret;
- ret = rv8803_rtc_set(dev, &tmp);
- if (ret < 0)
- return ret;
- /* clear reset */
- ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR, 0);
- if (ret < 0)
- return ret;
- debug("RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
- tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
- tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
- return 0;
- }
- static int rv8803_probe(struct udevice *dev)
- {
- i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
- DM_I2C_CHIP_WR_ADDRESS);
- return 0;
- }
- static const struct rtc_ops rv8803_rtc_ops = {
- .get = rv8803_rtc_get,
- .set = rv8803_rtc_set,
- .reset = rv8803_rtc_reset,
- };
- static const struct udevice_id rv8803_rtc_ids[] = {
- { .compatible = "microcrystal,rv8803", },
- { }
- };
- U_BOOT_DRIVER(rtc_rv8803) = {
- .name = "rtc-rv8803",
- .id = UCLASS_RTC,
- .probe = rv8803_probe,
- .of_match = rv8803_rtc_ids,
- .ops = &rv8803_rtc_ops,
- };
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