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e63e088b60
Add support for Dallas/Maxim ds1672 32bit counter RTC. Signed-off-by: Tim Harvey <tharvey@gateworks.com>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Analog Devices DS1672 I2C RTC driver
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*
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* Copyright 2025 Gateworks Corporation.
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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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#include <dm/device_compat.h>
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/* Registers */
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#define DS1672_REG_CNT_BASE 0
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#define DS1672_REG_CONTROL 4
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#define DS1672_REG_TRICKLE 5
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#define DS1672_REG_CONTROL_EOSC 0x80
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static int ds1672_read_time(struct udevice *dev, struct rtc_time *tm)
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{
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time64_t secs;
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u8 regs[4];
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int ret;
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ret = dm_i2c_read(dev, DS1672_REG_CONTROL, regs, 1);
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if (ret)
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return ret;
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if (regs[0] & DS1672_REG_CONTROL_EOSC) {
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dev_err(dev, "Oscillator not enabled. Set time to enable.\n");
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return -EINVAL;
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}
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ret = dm_i2c_read(dev, DS1672_REG_CNT_BASE, regs, 4);
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if (ret)
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return ret;
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dev_dbg(dev, "raw read: 0x%02x 0x%02x 0x%02x 0x%02x\n",
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regs[0], regs[1], regs[2], regs[3]);
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secs = ((unsigned long)regs[3] << 24) | (regs[2] << 16) | (regs[1] << 8) | regs[0];
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rtc_to_tm(secs, tm);
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dev_dbg(dev, "read %lld %4d-%02d-%02d (wday=%d) %2d:%02d:%02d\n", secs,
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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 ds1672_set_time(struct udevice *dev, const struct rtc_time *tm)
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{
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time64_t secs = rtc_mktime(tm);
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u8 regs[5];
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dev_dbg(dev, "set %4d-%02d-%02d (wday=%d) %2d:%02d:%02d %lld\n",
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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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secs);
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if (tm->tm_year < 2000) {
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dev_err(dev, "year %d (before 2000) not supported\n",
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tm->tm_year);
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return -EINVAL;
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}
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regs[0] = secs & 0x000000ff;
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regs[1] = (secs & 0x0000ff00) >> 8;
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regs[2] = (secs & 0x00ff0000) >> 16;
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regs[3] = (secs & 0xff000000) >> 24;
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regs[4] = 0; /* set control reg to enable counting */
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return dm_i2c_write(dev, DS1672_REG_CNT_BASE, regs, 5);
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}
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static int ds1672_reset(struct udevice *dev)
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{
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u8 regs[5] = { 0 };
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return dm_i2c_write(dev, DS1672_REG_CNT_BASE, regs, 5);
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}
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static int ds1672_read8(struct udevice *dev, unsigned int reg)
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{
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return dm_i2c_reg_read(dev, reg);
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}
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static int ds1672_write8(struct udevice *dev, unsigned int reg, int val)
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{
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return dm_i2c_reg_write(dev, reg, val);
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}
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static const struct rtc_ops ds1672_rtc_ops = {
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.get = ds1672_read_time,
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.set = ds1672_set_time,
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.reset = ds1672_reset,
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.read8 = ds1672_read8,
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.write8 = ds1672_write8,
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};
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static int ds1672_probe(struct udevice *dev)
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{
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i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS | DM_I2C_CHIP_WR_ADDRESS);
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return 0;
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}
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static const struct udevice_id ds1672_of_id[] = {
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{ .compatible = "dallas,ds1672" },
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{ }
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};
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U_BOOT_DRIVER(rtc_max313xx) = {
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.name = "rtc-ds1672",
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.id = UCLASS_RTC,
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.probe = ds1672_probe,
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.of_match = ds1672_of_id,
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.ops = &ds1672_rtc_ops,
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};
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