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// 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,
};
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