rtc: add support for rv3028 rtc
Add support for rtc3028 rtc from microcrystal.
based on linux dirver:
commit a38fd8748464: ("Linux 5.12-rc2")
Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Heiko Schocher
Tom Rini
parent
3dfd739370
commit
05a0776ed5
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@ -102,6 +102,12 @@ config RTC_PCF8563
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If you say yes here you get support for the Philips PCF8563 RTC
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and compatible chips.
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config RTC_RV3028
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bool "Enable RV3028 driver"
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depends on DM_RTC
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help
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The MicroCrystal RV3028 is a I2C Real Time Clock (RTC)
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config RTC_RV3029
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bool "Enable RV3029 driver"
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depends on DM_RTC
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@ -47,6 +47,7 @@ obj-$(CONFIG_RTC_PCF2127) += pcf2127.o
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obj-$(CONFIG_RTC_PL031) += pl031.o
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obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
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obj-$(CONFIG_RTC_RS5C372A) += rs5c372.o
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obj-$(CONFIG_RTC_RV3028) += rv3028.o
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obj-$(CONFIG_RTC_RV3029) += rv3029.o
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obj-$(CONFIG_RTC_RV8803) += rv8803.o
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obj-$(CONFIG_RTC_RX8025) += rx8025.o
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@ -0,0 +1,208 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* RTC driver for the Micro Crystal RV3028
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*
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* based on linux driver from
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* Copyright (C) 2019 Micro Crystal SA
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*
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* Alexandre Belloni <alexandre.belloni@bootlin.com>
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*
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*/
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#include <dm.h>
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#include <i2c.h>
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#include <rtc.h>
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#define RV3028_SEC 0x00
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#define RV3028_MIN 0x01
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#define RV3028_HOUR 0x02
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#define RV3028_WDAY 0x03
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#define RV3028_DAY 0x04
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#define RV3028_MONTH 0x05
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#define RV3028_YEAR 0x06
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#define RV3028_ALARM_MIN 0x07
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#define RV3028_ALARM_HOUR 0x08
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#define RV3028_ALARM_DAY 0x09
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#define RV3028_STATUS 0x0E
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#define RV3028_CTRL1 0x0F
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#define RV3028_CTRL2 0x10
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#define RV3028_EVT_CTRL 0x13
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#define RV3028_TS_COUNT 0x14
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#define RV3028_TS_SEC 0x15
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#define RV3028_RAM1 0x1F
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#define RV3028_EEPROM_ADDR 0x25
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#define RV3028_EEPROM_DATA 0x26
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#define RV3028_EEPROM_CMD 0x27
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#define RV3028_CLKOUT 0x35
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#define RV3028_OFFSET 0x36
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#define RV3028_BACKUP 0x37
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#define RV3028_STATUS_PORF BIT(0)
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#define RV3028_STATUS_EVF BIT(1)
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#define RV3028_STATUS_AF BIT(2)
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#define RV3028_STATUS_TF BIT(3)
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#define RV3028_STATUS_UF BIT(4)
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#define RV3028_STATUS_BSF BIT(5)
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#define RV3028_STATUS_CLKF BIT(6)
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#define RV3028_STATUS_EEBUSY BIT(7)
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#define RV3028_CLKOUT_FD_MASK GENMASK(2, 0)
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#define RV3028_CLKOUT_PORIE BIT(3)
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#define RV3028_CLKOUT_CLKSY BIT(6)
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#define RV3028_CLKOUT_CLKOE BIT(7)
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#define RV3028_CTRL1_EERD BIT(3)
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#define RV3028_CTRL1_WADA BIT(5)
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#define RV3028_CTRL2_RESET BIT(0)
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#define RV3028_CTRL2_12_24 BIT(1)
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#define RV3028_CTRL2_EIE BIT(2)
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#define RV3028_CTRL2_AIE BIT(3)
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#define RV3028_CTRL2_TIE BIT(4)
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#define RV3028_CTRL2_UIE BIT(5)
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#define RV3028_CTRL2_TSE BIT(7)
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#define RV3028_EVT_CTRL_TSR BIT(2)
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#define RV3028_EEPROM_CMD_UPDATE 0x11
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#define RV3028_EEPROM_CMD_WRITE 0x21
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#define RV3028_EEPROM_CMD_READ 0x22
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#define RV3028_EEBUSY_POLL 10000
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#define RV3028_EEBUSY_TIMEOUT 100000
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#define RV3028_BACKUP_TCE BIT(5)
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#define RV3028_BACKUP_TCR_MASK GENMASK(1, 0)
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#define OFFSET_STEP_PPT 953674
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#define RTC_RV3028_LEN 7
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static int rv3028_rtc_get(struct udevice *dev, struct rtc_time *tm)
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{
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u8 regs[RTC_RV3028_LEN];
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u8 status;
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int ret;
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ret = dm_i2c_read(dev, RV3028_STATUS, &status, 1);
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if (ret < 0) {
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printf("%s: error reading RTC status: %x\n", __func__, ret);
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return -EIO;
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}
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if (status & RV3028_STATUS_PORF) {
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printf("Voltage low, data is invalid.\n");
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return -EINVAL;
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}
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ret = dm_i2c_read(dev, RV3028_SEC, regs, sizeof(regs));
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if (ret < 0) {
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printf("%s: error reading RTC: %x\n", __func__, ret);
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return -EIO;
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}
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tm->tm_sec = bcd2bin(regs[RV3028_SEC] & 0x7f);
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tm->tm_min = bcd2bin(regs[RV3028_MIN] & 0x7f);
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tm->tm_hour = bcd2bin(regs[RV3028_HOUR] & 0x3f);
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tm->tm_wday = regs[RV3028_WDAY] & 0x7;
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tm->tm_mday = bcd2bin(regs[RV3028_DAY] & 0x3f);
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tm->tm_mon = bcd2bin(regs[RV3028_MONTH] & 0x1f);
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tm->tm_year = bcd2bin(regs[RV3028_YEAR]) + 2000;
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tm->tm_yday = 0;
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tm->tm_isdst = 0;
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debug("%s: %4d-%02d-%02d (wday=%d) %2d:%02d:%02d\n",
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__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
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tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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static int rv3028_rtc_set(struct udevice *dev, const struct rtc_time *tm)
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{
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u8 regs[RTC_RV3028_LEN];
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u8 status;
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int ret;
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debug("%s: %4d-%02d-%02d (wday=%d( %2d:%02d:%02d\n",
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__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
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tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
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if (tm->tm_year < 2000) {
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printf("%s: year %d (before 2000) not supported\n",
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__func__, tm->tm_year);
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return -EINVAL;
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}
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regs[RV3028_SEC] = bin2bcd(tm->tm_sec);
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regs[RV3028_MIN] = bin2bcd(tm->tm_min);
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regs[RV3028_HOUR] = bin2bcd(tm->tm_hour);
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regs[RV3028_WDAY] = tm->tm_wday;
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regs[RV3028_DAY] = bin2bcd(tm->tm_mday);
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regs[RV3028_MONTH] = bin2bcd(tm->tm_mon);
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regs[RV3028_YEAR] = bin2bcd(tm->tm_year - 2000);
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ret = dm_i2c_write(dev, RV3028_SEC, regs, sizeof(regs));
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if (ret) {
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printf("%s: set rtc error: %d\n", __func__, ret);
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return ret;
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}
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ret = dm_i2c_read(dev, RV3028_STATUS, &status, 1);
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if (ret < 0) {
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printf("%s: error reading RTC status: %x\n", __func__, ret);
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return -EIO;
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}
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status |= RV3028_STATUS_PORF;
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return dm_i2c_write(dev, RV3028_STATUS, &status, 1);
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}
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static int rv3028_rtc_reset(struct udevice *dev)
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{
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return 0;
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}
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static int rv3028_rtc_read8(struct udevice *dev, unsigned int reg)
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{
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u8 data;
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int ret;
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ret = dm_i2c_read(dev, reg, &data, sizeof(data));
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return ret < 0 ? ret : data;
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}
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static int rv3028_rtc_write8(struct udevice *dev, unsigned int reg, int val)
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{
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u8 data = val;
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return dm_i2c_write(dev, reg, &data, 1);
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}
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static int rv3028_probe(struct udevice *dev)
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{
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i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
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DM_I2C_CHIP_WR_ADDRESS);
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return 0;
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}
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static const struct rtc_ops rv3028_rtc_ops = {
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.get = rv3028_rtc_get,
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.set = rv3028_rtc_set,
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.read8 = rv3028_rtc_read8,
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.write8 = rv3028_rtc_write8,
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.reset = rv3028_rtc_reset,
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};
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static const struct udevice_id rv3028_rtc_ids[] = {
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{ .compatible = "microcrystal,rv3028" },
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{ }
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};
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U_BOOT_DRIVER(rtc_rv3028) = {
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.name = "rtc-rv3028",
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.id = UCLASS_RTC,
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.probe = rv3028_probe,
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.of_match = rv3028_rtc_ids,
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.ops = &rv3028_rtc_ops,
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};
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