496 lines
11 KiB
C
496 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH
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*
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* Based on a the Linux rtc-rv3029c2.c driver written by:
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* Gregory Hermant <gregory.hermant@calao-systems.com>
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* Michael Buesch <m@bues.ch>
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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 <i2c.h>
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#include <rtc.h>
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#define RTC_RV3029_PAGE_LEN 7
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/* control section */
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#define RV3029_ONOFF_CTRL 0x00
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#define RV3029_ONOFF_CTRL_WE BIT(0)
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#define RV3029_ONOFF_CTRL_TE BIT(1)
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#define RV3029_ONOFF_CTRL_TAR BIT(2)
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#define RV3029_ONOFF_CTRL_EERE BIT(3)
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#define RV3029_ONOFF_CTRL_SRON BIT(4)
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#define RV3029_ONOFF_CTRL_TD0 BIT(5)
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#define RV3029_ONOFF_CTRL_TD1 BIT(6)
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#define RV3029_ONOFF_CTRL_CLKINT BIT(7)
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#define RV3029_IRQ_CTRL 0x01
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#define RV3029_IRQ_CTRL_AIE BIT(0)
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#define RV3029_IRQ_CTRL_TIE BIT(1)
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#define RV3029_IRQ_CTRL_V1IE BIT(2)
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#define RV3029_IRQ_CTRL_V2IE BIT(3)
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#define RV3029_IRQ_CTRL_SRIE BIT(4)
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#define RV3029_IRQ_FLAGS 0x02
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#define RV3029_IRQ_FLAGS_AF BIT(0)
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#define RV3029_IRQ_FLAGS_TF BIT(1)
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#define RV3029_IRQ_FLAGS_V1IF BIT(2)
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#define RV3029_IRQ_FLAGS_V2IF BIT(3)
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#define RV3029_IRQ_FLAGS_SRF BIT(4)
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#define RV3029_STATUS 0x03
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#define RV3029_STATUS_VLOW1 BIT(2)
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#define RV3029_STATUS_VLOW2 BIT(3)
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#define RV3029_STATUS_SR BIT(4)
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#define RV3029_STATUS_PON BIT(5)
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#define RV3029_STATUS_EEBUSY BIT(7)
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#define RV3029_RST_CTRL 0x04
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#define RV3029_RST_CTRL_SYSR BIT(4)
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#define RV3029_CONTROL_SECTION_LEN 0x05
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/* watch section */
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#define RV3029_W_SEC 0x08
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#define RV3029_W_MINUTES 0x09
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#define RV3029_W_HOURS 0x0A
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#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */
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#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */
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#define RV3029_W_DATE 0x0B
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#define RV3029_W_DAYS 0x0C
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#define RV3029_W_MONTHS 0x0D
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#define RV3029_W_YEARS 0x0E
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/* eeprom control section */
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#define RV3029_CONTROL_E2P_EECTRL 0x30
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#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */
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#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */
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#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */
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#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */
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#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\
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RV3029_TRICKLE_5K |\
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RV3029_TRICKLE_20K |\
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RV3029_TRICKLE_80K)
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#define RV3029_TRICKLE_SHIFT 4
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static int rv3029_rtc_get(struct udevice *dev, struct rtc_time *tm)
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{
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u8 regs[RTC_RV3029_PAGE_LEN];
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int ret;
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ret = dm_i2c_read(dev, RV3029_W_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[RV3029_W_SEC - RV3029_W_SEC]);
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tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
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/* HR field has a more complex interpretation */
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{
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const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
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if (_hr & RV3029_REG_HR_12_24) {
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/* 12h format */
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tm->tm_hour = bcd2bin(_hr & 0x1f);
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if (_hr & RV3029_REG_HR_PM) /* PM flag set */
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tm->tm_hour += 12;
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} else {
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/* 24h format */
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tm->tm_hour = bcd2bin(_hr & 0x3f);
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}
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}
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tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
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tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
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/* RTC supports only years > 1999 */
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tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 2000;
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tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
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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 rv3029_rtc_set(struct udevice *dev, const struct rtc_time *tm)
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{
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u8 regs[RTC_RV3029_PAGE_LEN];
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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[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
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regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
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regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
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regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
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regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
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regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
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regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 2000);
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return dm_i2c_write(dev, RV3029_W_SEC, regs, sizeof(regs));
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}
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static int rv3029_rtc_reset(struct udevice *dev)
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{
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u8 ctrl = RV3029_RST_CTRL_SYSR;
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unsigned long start;
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const unsigned long timeout_ms = 10000;
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int ret;
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/* trigger the system-reset */
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ret = dm_i2c_write(dev, RV3029_RST_CTRL, &ctrl, 1);
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if (ret < 0)
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return -EIO;
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/* wait for the system-reset to complete */
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start = get_timer(0);
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do {
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if (get_timer(start) > timeout_ms)
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return -ETIMEDOUT;
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ret = dm_i2c_read(dev, RV3029_RST_CTRL, &ctrl, 1);
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if (ret < 0)
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return -EIO;
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} while (ctrl & RV3029_RST_CTRL_SYSR);
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return 0;
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}
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static int rv3029_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 rv3029_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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#if defined(OF_CONTROL)
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static int rv3029_get_sr(struct udevice *dev, u8 *buf)
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{
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int ret = dm_i2c_read(dev, RV3029_STATUS, buf, 1);
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if (ret < 0)
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return -EIO;
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dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
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return 0;
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}
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static int rv3029_set_sr(struct udevice *dev, u8 val)
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{
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int ret;
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ret = dm_i2c_read(dev, RV3029_STATUS, &val, 1);
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if (ret < 0)
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return -EIO;
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dev_dbg(dev, "status = 0x%.2x (%d)\n", val, val);
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return 0;
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}
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static int rv3029_eeprom_busywait(struct udevice *dev)
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{
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int i, ret;
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u8 sr;
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for (i = 100; i > 0; i--) {
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ret = rv3029_get_sr(dev, &sr);
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if (ret < 0)
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break;
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if (!(sr & RV3029_STATUS_EEBUSY))
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break;
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udelay(10000);
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}
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if (i <= 0) {
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dev_err(dev, "EEPROM busy wait timeout.\n");
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return -ETIMEDOUT;
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}
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return ret;
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}
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static int rv3029_update_bits(struct udevice *dev, u8 reg, u8 mask, u8 set)
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{
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u8 buf;
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int ret;
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ret = dm_i2c_read(dev, reg, &buf, 1);
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if (ret < 0)
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return ret;
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if ((buf & mask) == (set && mask))
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return 0;
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buf = (buf & ~mask) | (set & mask);
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ret = dm_i2c_read(dev, reg, &buf, 1);
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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 rv3029_eeprom_exit(struct udevice *dev)
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{
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/* Re-enable eeprom refresh */
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return rv3029_update_bits(dev, RV3029_ONOFF_CTRL,
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RV3029_ONOFF_CTRL_EERE,
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RV3029_ONOFF_CTRL_EERE);
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}
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static int rv3029_eeprom_enter(struct udevice *dev)
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{
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int ret;
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u8 sr;
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/* Check whether we are in the allowed voltage range. */
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ret = rv3029_get_sr(dev, &sr);
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if (ret < 0)
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return ret;
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if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
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/* We clear the bits and retry once just in case
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* we had a brown out in early startup.
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*/
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sr &= ~RV3029_STATUS_VLOW1;
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sr &= ~RV3029_STATUS_VLOW2;
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ret = rv3029_set_sr(dev, sr);
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if (ret < 0)
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return ret;
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udelay(10000);
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ret = rv3029_get_sr(dev, &sr);
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if (ret < 0)
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return ret;
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if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
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dev_err(dev, "Supply voltage is too low to safely access the EEPROM.\n");
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return -ENODEV;
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}
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}
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/* Disable eeprom refresh. */
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ret = rv3029_update_bits(dev,
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RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE, 0);
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if (ret < 0)
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return ret;
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/* Wait for any previous eeprom accesses to finish. */
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ret = rv3029_eeprom_busywait(dev);
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if (ret < 0)
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rv3029_eeprom_exit(dev);
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return ret;
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}
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static int rv3029_eeprom_read(struct udevice *dev, u8 reg,
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u8 buf[], size_t len)
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{
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int ret, err;
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err = rv3029_eeprom_enter(dev);
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if (err < 0)
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return err;
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ret = dm_i2c_read(dev, reg, buf, len);
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err = rv3029_eeprom_exit(dev);
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if (err < 0)
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return err;
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return ret;
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}
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static int rv3029_eeprom_write(struct udevice *dev, u8 reg,
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u8 const buf[], size_t len)
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{
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int ret;
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size_t i;
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u8 tmp;
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ret = rv3029_eeprom_enter(dev);
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if (ret < 0)
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return ret;
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for (i = 0; i < len; i++, reg++) {
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ret = dm_i2c_read(dev, reg, &tmp, 1);
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if (ret < 0)
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break;
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if (tmp != buf[i]) {
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ret = dm_i2c_write(dev, reg, &buf[i], 1);
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if (ret < 0)
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break;
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}
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ret = rv3029_eeprom_busywait(dev);
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if (ret < 0)
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break;
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}
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ret = rv3029_eeprom_exit(dev);
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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 rv3029_eeprom_update_bits(struct udevice *dev,
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u8 reg, u8 mask, u8 set)
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{
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u8 buf;
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int ret;
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ret = rv3029_eeprom_read(dev, reg, &buf, 1);
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if (ret < 0)
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return ret;
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/*
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* If the EEPROM already reads the correct bitpattern, we don't need
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* to update it.
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*/
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if ((buf & mask) == (set & mask))
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return 0;
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buf = (buf & ~mask) | (set & mask);
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ret = rv3029_eeprom_write(dev, reg, &buf, 1);
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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 void rv3029_trickle_config(struct udevice *dev)
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{
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static const struct rv3029_trickle_tab_elem {
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u32 r; /* resistance in ohms */
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u8 conf; /* trickle config bits */
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} rv3029_trickle_tab[] = {
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{
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.r = 1076,
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.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
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RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
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}, {
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.r = 1091,
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.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
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RV3029_TRICKLE_20K,
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}, {
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.r = 1137,
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.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
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RV3029_TRICKLE_80K,
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}, {
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.r = 1154,
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.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
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}, {
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.r = 1371,
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.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
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RV3029_TRICKLE_80K,
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}, {
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.r = 1395,
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.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
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}, {
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.r = 1472,
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.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
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}, {
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.r = 1500,
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.conf = RV3029_TRICKLE_1K,
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}, {
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.r = 3810,
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.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
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RV3029_TRICKLE_80K,
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}, {
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.r = 4000,
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.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
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}, {
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.r = 4706,
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.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
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}, {
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.r = 5000,
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.conf = RV3029_TRICKLE_5K,
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}, {
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.r = 16000,
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.conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
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}, {
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.r = 20000,
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.conf = RV3029_TRICKLE_20K,
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}, {
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.r = 80000,
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.conf = RV3029_TRICKLE_80K,
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},
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};
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int err;
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u32 ohms;
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u8 trickle_set_bits = 0;
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/* Configure the trickle charger. */
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err = dev_read_u32(dev, "trickle-resistor-ohms", &ohms);
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if (!err) {
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/* Find trickle-charger config */
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for (int i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++)
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if (rv3029_trickle_tab[i].r >= ohms) {
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dev_dbg(dev, "trickle charger at %d ohms\n",
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rv3029_trickle_tab[i].r);
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trickle_set_bits = rv3029_trickle_tab[i].conf;
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break;
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}
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}
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dev_dbg(dev, "trickle charger config 0x%x\n", trickle_set_bits);
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err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
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RV3029_TRICKLE_MASK,
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trickle_set_bits);
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if (err < 0)
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dev_dbg(dev, "failed to update trickle charger\n");
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}
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#else
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static inline void rv3029_trickle_config(struct udevice *dev)
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{
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}
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#endif
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static int rv3029_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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rv3029_trickle_config(dev);
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return 0;
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}
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static const struct rtc_ops rv3029_rtc_ops = {
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.get = rv3029_rtc_get,
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.set = rv3029_rtc_set,
|
|
.read8 = rv3029_rtc_read8,
|
|
.write8 = rv3029_rtc_write8,
|
|
.reset = rv3029_rtc_reset,
|
|
};
|
|
|
|
static const struct udevice_id rv3029_rtc_ids[] = {
|
|
{ .compatible = "mc,rv3029" },
|
|
{ .compatible = "mc,rv3029c2" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(rtc_rv3029) = {
|
|
.name = "rtc-rv3029",
|
|
.id = UCLASS_RTC,
|
|
.probe = rv3029_probe,
|
|
.of_match = rv3029_rtc_ids,
|
|
.ops = &rv3029_rtc_ops,
|
|
};
|