123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * RTC driver for the Micro Crystal RV3028
- *
- * based on linux driver from
- * Copyright (C) 2019 Micro Crystal SA
- *
- * Alexandre Belloni <alexandre.belloni@bootlin.com>
- *
- */
- #include <dm.h>
- #include <i2c.h>
- #include <rtc.h>
- #define RV3028_SEC 0x00
- #define RV3028_MIN 0x01
- #define RV3028_HOUR 0x02
- #define RV3028_WDAY 0x03
- #define RV3028_DAY 0x04
- #define RV3028_MONTH 0x05
- #define RV3028_YEAR 0x06
- #define RV3028_ALARM_MIN 0x07
- #define RV3028_ALARM_HOUR 0x08
- #define RV3028_ALARM_DAY 0x09
- #define RV3028_STATUS 0x0E
- #define RV3028_CTRL1 0x0F
- #define RV3028_CTRL2 0x10
- #define RV3028_EVT_CTRL 0x13
- #define RV3028_TS_COUNT 0x14
- #define RV3028_TS_SEC 0x15
- #define RV3028_RAM1 0x1F
- #define RV3028_EEPROM_ADDR 0x25
- #define RV3028_EEPROM_DATA 0x26
- #define RV3028_EEPROM_CMD 0x27
- #define RV3028_CLKOUT 0x35
- #define RV3028_OFFSET 0x36
- #define RV3028_BACKUP 0x37
- #define RV3028_STATUS_PORF BIT(0)
- #define RV3028_STATUS_EVF BIT(1)
- #define RV3028_STATUS_AF BIT(2)
- #define RV3028_STATUS_TF BIT(3)
- #define RV3028_STATUS_UF BIT(4)
- #define RV3028_STATUS_BSF BIT(5)
- #define RV3028_STATUS_CLKF BIT(6)
- #define RV3028_STATUS_EEBUSY BIT(7)
- #define RV3028_CLKOUT_FD_MASK GENMASK(2, 0)
- #define RV3028_CLKOUT_PORIE BIT(3)
- #define RV3028_CLKOUT_CLKSY BIT(6)
- #define RV3028_CLKOUT_CLKOE BIT(7)
- #define RV3028_CTRL1_EERD BIT(3)
- #define RV3028_CTRL1_WADA BIT(5)
- #define RV3028_CTRL2_RESET BIT(0)
- #define RV3028_CTRL2_12_24 BIT(1)
- #define RV3028_CTRL2_EIE BIT(2)
- #define RV3028_CTRL2_AIE BIT(3)
- #define RV3028_CTRL2_TIE BIT(4)
- #define RV3028_CTRL2_UIE BIT(5)
- #define RV3028_CTRL2_TSE BIT(7)
- #define RV3028_EVT_CTRL_TSR BIT(2)
- #define RV3028_EEPROM_CMD_UPDATE 0x11
- #define RV3028_EEPROM_CMD_WRITE 0x21
- #define RV3028_EEPROM_CMD_READ 0x22
- #define RV3028_EEBUSY_POLL 10000
- #define RV3028_EEBUSY_TIMEOUT 100000
- #define RV3028_BACKUP_TCE BIT(5)
- #define RV3028_BACKUP_TCR_MASK GENMASK(1, 0)
- #define OFFSET_STEP_PPT 953674
- #define RTC_RV3028_LEN 7
- static int rv3028_rtc_get(struct udevice *dev, struct rtc_time *tm)
- {
- u8 regs[RTC_RV3028_LEN];
- u8 status;
- int ret;
- ret = dm_i2c_read(dev, RV3028_STATUS, &status, 1);
- if (ret < 0) {
- printf("%s: error reading RTC status: %x\n", __func__, ret);
- return -EIO;
- }
- if (status & RV3028_STATUS_PORF) {
- printf("Voltage low, data is invalid.\n");
- return -EINVAL;
- }
- ret = dm_i2c_read(dev, RV3028_SEC, regs, sizeof(regs));
- if (ret < 0) {
- printf("%s: error reading RTC: %x\n", __func__, ret);
- return -EIO;
- }
- tm->tm_sec = bcd2bin(regs[RV3028_SEC] & 0x7f);
- tm->tm_min = bcd2bin(regs[RV3028_MIN] & 0x7f);
- tm->tm_hour = bcd2bin(regs[RV3028_HOUR] & 0x3f);
- tm->tm_wday = regs[RV3028_WDAY] & 0x7;
- tm->tm_mday = bcd2bin(regs[RV3028_DAY] & 0x3f);
- tm->tm_mon = bcd2bin(regs[RV3028_MONTH] & 0x1f);
- tm->tm_year = bcd2bin(regs[RV3028_YEAR]) + 2000;
- tm->tm_yday = 0;
- tm->tm_isdst = 0;
- debug("%s: %4d-%02d-%02d (wday=%d) %2d:%02d:%02d\n",
- __func__, 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 rv3028_rtc_set(struct udevice *dev, const struct rtc_time *tm)
- {
- u8 regs[RTC_RV3028_LEN];
- u8 status;
- int ret;
- debug("%s: %4d-%02d-%02d (wday=%d( %2d:%02d:%02d\n",
- __func__, 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) {
- printf("%s: year %d (before 2000) not supported\n",
- __func__, tm->tm_year);
- return -EINVAL;
- }
- regs[RV3028_SEC] = bin2bcd(tm->tm_sec);
- regs[RV3028_MIN] = bin2bcd(tm->tm_min);
- regs[RV3028_HOUR] = bin2bcd(tm->tm_hour);
- regs[RV3028_WDAY] = tm->tm_wday;
- regs[RV3028_DAY] = bin2bcd(tm->tm_mday);
- regs[RV3028_MONTH] = bin2bcd(tm->tm_mon);
- regs[RV3028_YEAR] = bin2bcd(tm->tm_year - 2000);
- ret = dm_i2c_write(dev, RV3028_SEC, regs, sizeof(regs));
- if (ret) {
- printf("%s: set rtc error: %d\n", __func__, ret);
- return ret;
- }
- ret = dm_i2c_read(dev, RV3028_STATUS, &status, 1);
- if (ret < 0) {
- printf("%s: error reading RTC status: %x\n", __func__, ret);
- return -EIO;
- }
- status |= RV3028_STATUS_PORF;
- return dm_i2c_write(dev, RV3028_STATUS, &status, 1);
- }
- static int rv3028_rtc_reset(struct udevice *dev)
- {
- return 0;
- }
- static int rv3028_rtc_read8(struct udevice *dev, unsigned int reg)
- {
- u8 data;
- int ret;
- ret = dm_i2c_read(dev, reg, &data, sizeof(data));
- return ret < 0 ? ret : data;
- }
- static int rv3028_rtc_write8(struct udevice *dev, unsigned int reg, int val)
- {
- u8 data = val;
- return dm_i2c_write(dev, reg, &data, 1);
- }
- static int rv3028_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 rv3028_rtc_ops = {
- .get = rv3028_rtc_get,
- .set = rv3028_rtc_set,
- .read8 = rv3028_rtc_read8,
- .write8 = rv3028_rtc_write8,
- .reset = rv3028_rtc_reset,
- };
- static const struct udevice_id rv3028_rtc_ids[] = {
- { .compatible = "microcrystal,rv3028" },
- { }
- };
- U_BOOT_DRIVER(rtc_rv3028) = {
- .name = "rtc-rv3028",
- .id = UCLASS_RTC,
- .probe = rv3028_probe,
- .of_match = rv3028_rtc_ids,
- .ops = &rv3028_rtc_ops,
- };
|