Add an implementation of the ds3231 driver that uses the driver model i2c APIs.
Signed-off-by: Chuanhua Han chuanhua.han@nxp.com --- Changes in v2: - Replace "#ifndef CONFIG_DM_RTC" with "#if !CONFIG_IS_ENABLED(DM_RTC)"
drivers/rtc/ds3231.c | 105 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+)
diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c index 9352ff87a2..1c93facf9a 100644 --- a/drivers/rtc/ds3231.c +++ b/drivers/rtc/ds3231.c @@ -13,6 +13,7 @@
#include <common.h> #include <command.h> +#include <dm.h> #include <rtc.h> #include <i2c.h>
@@ -50,6 +51,7 @@ #define RTC_STAT_BIT_EN32KHZ 0x8 /* Enable 32KHz Output */
+#if !CONFIG_IS_ENABLED(DM_RTC) static uchar rtc_read (uchar reg); static void rtc_write (uchar reg, uchar val);
@@ -164,3 +166,106 @@ static void rtc_write (uchar reg, uchar val) { i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); } +#else +static int ds3231_rtc_get(struct udevice *dev, struct rtc_time *tmp) +{ + int rel = 0; + uchar sec, min, hour, mday, wday, mon_cent, year, status; + + status = dm_i2c_reg_read(dev, RTC_STAT_REG_ADDR); + sec = dm_i2c_reg_read(dev, RTC_SEC_REG_ADDR); + min = dm_i2c_reg_read(dev, RTC_MIN_REG_ADDR); + hour = dm_i2c_reg_read(dev, RTC_HR_REG_ADDR); + wday = dm_i2c_reg_read(dev, RTC_DAY_REG_ADDR); + mday = dm_i2c_reg_read(dev, RTC_DATE_REG_ADDR); + mon_cent = dm_i2c_reg_read(dev, RTC_MON_REG_ADDR); + year = dm_i2c_reg_read(dev, RTC_YR_REG_ADDR); + + if (status & RTC_STAT_BIT_OSF) { + printf("### Warning: RTC oscillator has stopped\n"); + /* clear the OSF flag */ + dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR, + dm_i2c_reg_read(dev, RTC_STAT_REG_ADDR) + & ~RTC_STAT_BIT_OSF); + rel = -1; + } + + tmp->tm_sec = bcd2bin(sec & 0x7F); + tmp->tm_min = bcd2bin(min & 0x7F); + tmp->tm_hour = bcd2bin(hour & 0x3F); + tmp->tm_mday = bcd2bin(mday & 0x3F); + tmp->tm_mon = bcd2bin(mon_cent & 0x1F); + tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 2000 : 1900); + tmp->tm_wday = bcd2bin((wday - 1) & 0x07); + tmp->tm_yday = 0; + tmp->tm_isdst = 0; + + debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", + tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, + tmp->tm_hour, tmp->tm_min, tmp->tm_sec); + + return rel; +} + +static int ds3231_rtc_set(struct udevice *dev, const struct rtc_time *tmp) +{ + uchar century; + + debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", + tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, + tmp->tm_hour, tmp->tm_min, tmp->tm_sec); + + dm_i2c_reg_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100)); + + century = (tmp->tm_year >= 2000) ? 0x80 : 0; + dm_i2c_reg_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon) | century); + + dm_i2c_reg_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1)); + dm_i2c_reg_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday)); + dm_i2c_reg_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour)); + dm_i2c_reg_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min)); + dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec)); + + return 0; +} + +static int ds3231_rtc_reset(struct udevice *dev) +{ + int ret; + + ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR, + RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2); + if (ret < 0) + return ret; + + return 0; +} + +static int ds3231_probe(struct udevice *dev) +{ + i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS | + DM_I2C_CHIP_WR_ADDRESS); + + return 0; +} + +static const struct rtc_ops ds3231_rtc_ops = { + .get = ds3231_rtc_get, + .set = ds3231_rtc_set, + .reset = ds3231_rtc_reset, +}; + +static const struct udevice_id ds3231_rtc_ids[] = { + { .compatible = "dallas,ds3231" }, + { .compatible = "dallas,ds3232" }, + { } +}; + +U_BOOT_DRIVER(rtc_ds3231) = { + .name = "rtc-ds3231", + .id = UCLASS_RTC, + .probe = ds3231_probe, + .of_match = ds3231_rtc_ids, + .ops = &ds3231_rtc_ops, +}; +#endif