mirror of
https://github.com/AsahiLinux/u-boot
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fb9a1ffef3
Signed-off-by: Michael Walle <michael@walle.cc>
167 lines
3.9 KiB
C
167 lines
3.9 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 <rtc.h>
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#include <i2c.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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{ }
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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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