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rtc: Add DM support to ds1307
Add an implementation of the ds1307 driver that uses the driver model i2c APIs. Signed-off-by: Chris Packham <judge.packham@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Chris Packham
Tom Rini
parent
2e0c6f38f3
commit
d425d6056e
2 changed files with 196 additions and 20 deletions
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@ -23,4 +23,11 @@ config RTC_PCF2127
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has a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a
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programmable watchdog function, a timestamp function, and many other features.
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config RTC_DS1307
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bool "Enable DS1307 driver"
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depends on DM_RTC
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help
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Support for Dallas Semiconductor (now Maxim) DS1307 and DS1338/9 and
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compatible Real Time Clock devices.
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endmenu
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@ -16,28 +16,16 @@
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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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#if defined(CONFIG_CMD_DATE)
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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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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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mcp794xx,
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};
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/*
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* RTC register addresses
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@ -62,6 +50,28 @@
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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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#if defined(CONFIG_CMD_DATE)
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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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@ -211,4 +221,163 @@ 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
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#endif /* CONFIG_CMD_DATE*/
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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 == 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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struct rtc_time tmp = {
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.tm_year = 1970,
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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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/* 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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ret = ds1307_rtc_set(dev, &tmp);
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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 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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{ }
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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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