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e1918ce299
The RX8803 and RX8900 register layouts are compatible with the one of the RV8803. So add these to the compatibles. The same compatible strings are used and approved in linux kernel. Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com> Reviewed-by: Michael Walle <michael@walle.cc>
171 lines
4 KiB
C
171 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Date & Time support for Micro Crystal RV-8803-C7.
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*
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* based on ds1307.c which is
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* (C) Copyright 2001, 2002, 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* Keith Outwater, keith_outwater@mvis.com`
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* Steven Scholz, steven.scholz@imc-berlin.de
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <log.h>
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#include <rtc.h>
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#include <i2c.h>
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#include <linux/bitops.h>
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/*
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* RTC register addresses
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*/
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#define RTC_SEC_REG_ADDR 0x00
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#define RTC_MIN_REG_ADDR 0x01
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#define RTC_HR_REG_ADDR 0x02
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#define RTC_DAY_REG_ADDR 0x03
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#define RTC_DATE_REG_ADDR 0x04
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#define RTC_MON_REG_ADDR 0x05
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#define RTC_YR_REG_ADDR 0x06
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#define RTC_FLAG_REG_ADDR 0x0E
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#define RTC_FLAG_BIT_V1F BIT(0)
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#define RTC_FLAG_BIT_V2F BIT(1)
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#define RTC_CTL_REG_ADDR 0x0F
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#define RTC_CTL_BIT_RST BIT(0)
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static int rv8803_rtc_set(struct udevice *dev, const struct rtc_time *tm)
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{
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int ret;
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u8 buf[7];
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debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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if (tm->tm_year < 2000 || tm->tm_year > 2099)
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printf("WARNING: year should be between 2000 and 2099!\n");
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buf[RTC_YR_REG_ADDR] = bin2bcd(tm->tm_year % 100);
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buf[RTC_MON_REG_ADDR] = bin2bcd(tm->tm_mon);
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buf[RTC_DAY_REG_ADDR] = 1 << (tm->tm_wday & 0x7);
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buf[RTC_DATE_REG_ADDR] = bin2bcd(tm->tm_mday);
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buf[RTC_HR_REG_ADDR] = bin2bcd(tm->tm_hour);
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buf[RTC_MIN_REG_ADDR] = bin2bcd(tm->tm_min);
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buf[RTC_SEC_REG_ADDR] = bin2bcd(tm->tm_sec);
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ret = dm_i2c_write(dev, 0, buf, sizeof(buf));
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if (ret < 0)
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return ret;
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return 0;
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}
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static int rv8803_rtc_get(struct udevice *dev, struct rtc_time *tm)
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{
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int ret;
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u8 buf[7];
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int flags;
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flags = dm_i2c_reg_read(dev, RTC_FLAG_REG_ADDR);
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if (flags < 0)
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return flags;
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debug("%s: flags=%Xh\n", __func__, flags);
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if (flags & RTC_FLAG_BIT_V1F)
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printf("### Warning: temperature compensation has stopped\n");
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if (flags & RTC_FLAG_BIT_V2F) {
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printf("### Warning: Voltage low, data is invalid\n");
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return -1;
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}
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ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
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if (ret < 0)
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return ret;
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tm->tm_sec = bcd2bin(buf[RTC_SEC_REG_ADDR] & 0x7F);
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tm->tm_min = bcd2bin(buf[RTC_MIN_REG_ADDR] & 0x7F);
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tm->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR] & 0x3F);
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tm->tm_mday = bcd2bin(buf[RTC_DATE_REG_ADDR] & 0x3F);
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tm->tm_mon = bcd2bin(buf[RTC_MON_REG_ADDR] & 0x1F);
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tm->tm_year = bcd2bin(buf[RTC_YR_REG_ADDR]) + 2000;
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tm->tm_wday = fls(buf[RTC_DAY_REG_ADDR] & 0x7F) - 1;
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tm->tm_yday = 0;
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tm->tm_isdst = 0;
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debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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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 rv8803_rtc_reset(struct udevice *dev)
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{
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int ret;
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struct rtc_time tmp = {
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.tm_year = 2000,
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.tm_mon = 1,
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.tm_mday = 1,
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.tm_hour = 0,
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.tm_min = 0,
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.tm_sec = 0,
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};
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/* assert reset */
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ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR, RTC_CTL_BIT_RST);
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if (ret < 0)
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return ret;
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/* clear all flags */
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ret = dm_i2c_reg_write(dev, RTC_FLAG_REG_ADDR, 0);
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if (ret < 0)
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return ret;
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ret = rv8803_rtc_set(dev, &tmp);
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if (ret < 0)
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return ret;
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/* clear reset */
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ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR, 0);
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if (ret < 0)
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return ret;
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debug("RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
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tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
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tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
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return 0;
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}
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static int rv8803_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 rv8803_rtc_ops = {
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.get = rv8803_rtc_get,
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.set = rv8803_rtc_set,
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.reset = rv8803_rtc_reset,
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};
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static const struct udevice_id rv8803_rtc_ids[] = {
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{ .compatible = "microcrystal,rv8803", },
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{ .compatible = "epson,rx8803" },
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{ .compatible = "epson,rx8900" },
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{ }
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};
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U_BOOT_DRIVER(rtc_rv8803) = {
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.name = "rtc-rv8803",
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.id = UCLASS_RTC,
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.probe = rv8803_probe,
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.of_match = rv8803_rtc_ids,
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.ops = &rv8803_rtc_ops,
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};
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