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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2008
- * Tor Krill, Excito Elektronik i Skåne , tor@excito.com
- *
- * Modelled after the ds1337 driver
- */
- /*
- * Date & Time support (no alarms) for Intersil
- * ISL1208 Real Time Clock (RTC).
- */
- #include <common.h>
- #include <command.h>
- #include <dm.h>
- #include <rtc.h>
- #include <i2c.h>
- /*---------------------------------------------------------------------*/
- #ifdef DEBUG_RTC
- #define DEBUGR(fmt,args...) printf(fmt ,##args)
- #else
- #define DEBUGR(fmt,args...)
- #endif
- /*---------------------------------------------------------------------*/
- /*
- * RTC register addresses
- */
- #define RTC_SEC_REG_ADDR 0x0
- #define RTC_MIN_REG_ADDR 0x1
- #define RTC_HR_REG_ADDR 0x2
- #define RTC_DATE_REG_ADDR 0x3
- #define RTC_MON_REG_ADDR 0x4
- #define RTC_YR_REG_ADDR 0x5
- #define RTC_DAY_REG_ADDR 0x6
- #define RTC_STAT_REG_ADDR 0x7
- /*
- * RTC control register bits
- */
- /*
- * RTC status register bits
- */
- #define RTC_STAT_BIT_ARST 0x80 /* AUTO RESET ENABLE BIT */
- #define RTC_STAT_BIT_XTOSCB 0x40 /* CRYSTAL OSCILLATOR ENABLE BIT */
- #define RTC_STAT_BIT_WRTC 0x10 /* WRITE RTC ENABLE BIT */
- #define RTC_STAT_BIT_ALM 0x04 /* ALARM BIT */
- #define RTC_STAT_BIT_BAT 0x02 /* BATTERY BIT */
- #define RTC_STAT_BIT_RTCF 0x01 /* REAL TIME CLOCK FAIL BIT */
- /*
- * Get the current time from the RTC
- */
- static int isl1208_rtc_get(struct udevice *dev, struct rtc_time *tmp)
- {
- int ret;
- uchar buf[8], val;
- ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
- if (ret < 0)
- return ret;
- if (buf[RTC_STAT_REG_ADDR] & RTC_STAT_BIT_RTCF) {
- printf ("### Warning: RTC oscillator has stopped\n");
- ret = dm_i2c_read(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
- if (ret < 0)
- return ret;
- val = val & ~(RTC_STAT_BIT_BAT | RTC_STAT_BIT_RTCF);
- ret = dm_i2c_write(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
- if (ret < 0)
- return ret;
- }
- tmp->tm_sec = bcd2bin(buf[RTC_SEC_REG_ADDR] & 0x7F);
- tmp->tm_min = bcd2bin(buf[RTC_MIN_REG_ADDR] & 0x7F);
- tmp->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR] & 0x3F);
- tmp->tm_mday = bcd2bin(buf[RTC_DATE_REG_ADDR] & 0x3F);
- tmp->tm_mon = bcd2bin(buf[RTC_MON_REG_ADDR] & 0x1F);
- tmp->tm_year = bcd2bin(buf[RTC_YR_REG_ADDR]) + 2000;
- tmp->tm_wday = bcd2bin(buf[RTC_DAY_REG_ADDR] & 0x07);
- tmp->tm_yday = 0;
- tmp->tm_isdst= 0;
- DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
- tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
- tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
- return 0;
- }
- /*
- * Set the RTC
- */
- static int isl1208_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
- {
- int ret;
- uchar val, buf[7];
- DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
- tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
- tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
- if (tmp->tm_year < 2000 || tmp->tm_year > 2099)
- printf("WARNING: year should be between 2000 and 2099!\n");
- /* enable write */
- ret = dm_i2c_read(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
- if (ret < 0)
- return ret;
- val = val | RTC_STAT_BIT_WRTC;
- ret = dm_i2c_write(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
- if (ret < 0)
- return ret;
- buf[RTC_YR_REG_ADDR] = bin2bcd(tmp->tm_year % 100);
- buf[RTC_MON_REG_ADDR] = bin2bcd(tmp->tm_mon);
- buf[RTC_DAY_REG_ADDR] = bin2bcd(tmp->tm_wday);
- buf[RTC_DATE_REG_ADDR] = bin2bcd(tmp->tm_mday);
- buf[RTC_HR_REG_ADDR] = bin2bcd(tmp->tm_hour) | 0x80; /* 24h clock */
- buf[RTC_MIN_REG_ADDR] = bin2bcd(tmp->tm_min);
- buf[RTC_SEC_REG_ADDR] = bin2bcd(tmp->tm_sec);
- ret = dm_i2c_write(dev, 0, buf, sizeof(buf));
- if (ret < 0)
- return ret;
- /* disable write */
- ret = dm_i2c_read(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
- if (ret < 0)
- return ret;
- val = val & ~RTC_STAT_BIT_WRTC;
- ret = dm_i2c_write(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
- if (ret < 0)
- return ret;
- return 0;
- }
- static int isl1208_rtc_reset(struct udevice *dev)
- {
- return 0;
- }
- static int isl1208_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 isl1208_rtc_ops = {
- .get = isl1208_rtc_get,
- .set = isl1208_rtc_set,
- .reset = isl1208_rtc_reset,
- };
- static const struct udevice_id isl1208_rtc_ids[] = {
- { .compatible = "isil,isl1208" },
- { }
- };
- U_BOOT_DRIVER(rtc_isl1208) = {
- .name = "rtc-isl1208",
- .id = UCLASS_RTC,
- .probe = isl1208_probe,
- .of_match = isl1208_rtc_ids,
- .ops = &isl1208_rtc_ops,
- };
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