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360 lines
9.2 KiB
C
360 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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* Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)
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* DS1307 and DS1338/9 Real Time Clock (RTC).
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*
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* based on ds1337.c
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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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enum ds_type {
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ds_1307,
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ds_1337,
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ds_1340,
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m41t11,
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mcp794xx,
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};
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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_CTL_REG_ADDR 0x07
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#define RTC_SEC_BIT_CH 0x80 /* Clock Halt (in Register 0) */
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#define RTC_CTL_BIT_RS0 0x01 /* Rate select 0 */
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#define RTC_CTL_BIT_RS1 0x02 /* Rate select 1 */
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#define RTC_CTL_BIT_SQWE 0x10 /* Square Wave Enable */
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#define RTC_CTL_BIT_OUT 0x80 /* Output Control */
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/* MCP7941X-specific bits */
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#define MCP7941X_BIT_ST 0x80
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#define MCP7941X_BIT_VBATEN 0x08
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#ifndef CONFIG_DM_RTC
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/*---------------------------------------------------------------------*/
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#undef DEBUG_RTC
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#ifdef DEBUG_RTC
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#define DEBUGR(fmt, args...) printf(fmt, ##args)
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#else
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#define DEBUGR(fmt, args...)
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#endif
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/*---------------------------------------------------------------------*/
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#ifndef CONFIG_SYS_I2C_RTC_ADDR
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# define CONFIG_SYS_I2C_RTC_ADDR 0x68
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#endif
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#if defined(CONFIG_RTC_DS1307) && (CONFIG_SYS_I2C_SPEED > 100000)
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# error The DS1307 is specified only up to 100kHz!
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#endif
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static uchar rtc_read (uchar reg);
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static void rtc_write (uchar reg, uchar val);
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/*
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* Get the current time from the RTC
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*/
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int rtc_get (struct rtc_time *tmp)
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{
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int rel = 0;
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uchar sec, min, hour, mday, wday, mon, year;
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#ifdef CONFIG_RTC_MCP79411
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read_rtc:
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#endif
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sec = rtc_read (RTC_SEC_REG_ADDR);
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min = rtc_read (RTC_MIN_REG_ADDR);
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hour = rtc_read (RTC_HR_REG_ADDR);
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wday = rtc_read (RTC_DAY_REG_ADDR);
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mday = rtc_read (RTC_DATE_REG_ADDR);
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mon = rtc_read (RTC_MON_REG_ADDR);
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year = rtc_read (RTC_YR_REG_ADDR);
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DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
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"hr: %02x min: %02x sec: %02x\n",
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year, mon, mday, wday, hour, min, sec);
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#ifdef CONFIG_RTC_DS1307
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if (sec & RTC_SEC_BIT_CH) {
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printf ("### Warning: RTC oscillator has stopped\n");
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/* clear the CH flag */
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rtc_write (RTC_SEC_REG_ADDR,
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rtc_read (RTC_SEC_REG_ADDR) & ~RTC_SEC_BIT_CH);
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rel = -1;
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}
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#endif
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#ifdef CONFIG_RTC_MCP79411
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/* make sure that the backup battery is enabled */
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if (!(wday & MCP7941X_BIT_VBATEN)) {
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rtc_write(RTC_DAY_REG_ADDR,
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wday | MCP7941X_BIT_VBATEN);
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}
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/* clock halted? turn it on, so clock can tick. */
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if (!(sec & MCP7941X_BIT_ST)) {
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rtc_write(RTC_SEC_REG_ADDR, MCP7941X_BIT_ST);
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printf("Started RTC\n");
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goto read_rtc;
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}
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#endif
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tmp->tm_sec = bcd2bin (sec & 0x7F);
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tmp->tm_min = bcd2bin (min & 0x7F);
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tmp->tm_hour = bcd2bin (hour & 0x3F);
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tmp->tm_mday = bcd2bin (mday & 0x3F);
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tmp->tm_mon = bcd2bin (mon & 0x1F);
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tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
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tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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return rel;
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}
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/*
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* Set the RTC
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*/
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int rtc_set (struct rtc_time *tmp)
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{
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DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
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printf("WARNING: year should be between 1970 and 2069!\n");
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rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
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rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
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#ifdef CONFIG_RTC_MCP79411
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rtc_write (RTC_DAY_REG_ADDR,
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bin2bcd (tmp->tm_wday + 1) | MCP7941X_BIT_VBATEN);
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#else
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rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
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#endif
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rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
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rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
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rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
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#ifdef CONFIG_RTC_MCP79411
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rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec) | MCP7941X_BIT_ST);
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#else
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rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
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#endif
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return 0;
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}
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/*
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* Reset the RTC. We setting the date back to 1970-01-01.
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* We also enable the oscillator output on the SQW/OUT pin and program
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* it for 32,768 Hz output. Note that according to the datasheet, turning
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* on the square wave output increases the current drain on the backup
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* battery to something between 480nA and 800nA.
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*/
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void rtc_reset (void)
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{
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rtc_write (RTC_SEC_REG_ADDR, 0x00); /* clearing Clock Halt */
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rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_SQWE | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS0);
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}
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/*
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* Helper functions
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*/
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static
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uchar rtc_read (uchar reg)
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{
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return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
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}
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static void rtc_write (uchar reg, uchar val)
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{
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i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
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}
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#endif /* !CONFIG_DM_RTC */
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#ifdef CONFIG_DM_RTC
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static int ds1307_rtc_set(struct udevice *dev, const struct rtc_time *tm)
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{
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int ret;
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uchar buf[7];
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enum ds_type type = dev_get_driver_data(dev);
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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 < 1970 || tm->tm_year > 2069)
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printf("WARNING: year should be between 1970 and 2069!\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] = bin2bcd(tm->tm_wday + 1);
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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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if (type == mcp794xx) {
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buf[RTC_DAY_REG_ADDR] |= MCP7941X_BIT_VBATEN;
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buf[RTC_SEC_REG_ADDR] |= MCP7941X_BIT_ST;
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}
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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 ds1307_rtc_get(struct udevice *dev, struct rtc_time *tm)
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{
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int ret;
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uchar buf[7];
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enum ds_type type = dev_get_driver_data(dev);
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read_rtc:
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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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if (type == ds_1307) {
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if (buf[RTC_SEC_REG_ADDR] & RTC_SEC_BIT_CH) {
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printf("### Warning: RTC oscillator has stopped\n");
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/* clear the CH flag */
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buf[RTC_SEC_REG_ADDR] &= ~RTC_SEC_BIT_CH;
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dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
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buf[RTC_SEC_REG_ADDR]);
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return -1;
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}
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}
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if (type == m41t11) {
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/* clock halted? turn it on, so clock can tick. */
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if (buf[RTC_SEC_REG_ADDR] & RTC_SEC_BIT_CH) {
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buf[RTC_SEC_REG_ADDR] &= ~RTC_SEC_BIT_CH;
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dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
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MCP7941X_BIT_ST);
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dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
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buf[RTC_SEC_REG_ADDR]);
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goto read_rtc;
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}
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}
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if (type == mcp794xx) {
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/* make sure that the backup battery is enabled */
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if (!(buf[RTC_DAY_REG_ADDR] & MCP7941X_BIT_VBATEN)) {
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dm_i2c_reg_write(dev, RTC_DAY_REG_ADDR,
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buf[RTC_DAY_REG_ADDR] |
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MCP7941X_BIT_VBATEN);
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}
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/* clock halted? turn it on, so clock can tick. */
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if (!(buf[RTC_SEC_REG_ADDR] & MCP7941X_BIT_ST)) {
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dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
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MCP7941X_BIT_ST);
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printf("Started RTC\n");
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goto read_rtc;
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}
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}
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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]) +
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(bcd2bin(buf[RTC_YR_REG_ADDR]) >= 70 ?
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1900 : 2000);
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tm->tm_wday = bcd2bin((buf[RTC_DAY_REG_ADDR] - 1) & 0x07);
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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 ds1307_rtc_reset(struct udevice *dev)
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{
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int ret;
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/* clear Clock Halt */
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ret = dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR, 0x00);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR,
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RTC_CTL_BIT_SQWE | RTC_CTL_BIT_RS1 |
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RTC_CTL_BIT_RS0);
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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 ds1307_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 ds1307_rtc_ops = {
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.get = ds1307_rtc_get,
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.set = ds1307_rtc_set,
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.reset = ds1307_rtc_reset,
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};
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static const struct udevice_id ds1307_rtc_ids[] = {
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{ .compatible = "dallas,ds1307", .data = ds_1307 },
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{ .compatible = "dallas,ds1337", .data = ds_1337 },
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{ .compatible = "dallas,ds1340", .data = ds_1340 },
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{ .compatible = "microchip,mcp7941x", .data = mcp794xx },
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{ .compatible = "st,m41t11", .data = m41t11 },
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{ }
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};
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U_BOOT_DRIVER(rtc_ds1307) = {
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.name = "rtc-ds1307",
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.id = UCLASS_RTC,
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.probe = ds1307_probe,
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.of_match = ds1307_rtc_ids,
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.ops = &ds1307_rtc_ops,
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};
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#endif /* CONFIG_DM_RTC */
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