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authorChuanhua Han <chuanhua.han@nxp.com>2019-06-21 16:21:53 +0800
committerTom Rini <trini@konsulko.com>2019-07-18 11:31:23 -0400
commit55f2bc7dd655b6c26cd5fd211a086406416510a6 (patch)
treed19397aedae99124462079f6c852d6fe9be867a1 /drivers/rtc/ds3231.c
parent5b123e010954d8f6ef24dd0cb1a8cbe1d7d53851 (diff)
rtc: Add DM support to ds3231
Add an implementation of the ds3231 driver that uses the driver model i2c APIs. Signed-off-by: Chuanhua Han <chuanhua.han@nxp.com> Reviewed-by: Lukasz Majewski <lukma@denx.de>
Diffstat (limited to 'drivers/rtc/ds3231.c')
-rw-r--r--drivers/rtc/ds3231.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c
index 9352ff87a2..79b026af4b 100644
--- a/drivers/rtc/ds3231.c
+++ b/drivers/rtc/ds3231.c
@@ -2,6 +2,9 @@
/*
* (C) Copyright 2006
* Markus Klotzbuecher, mk@denx.de
+ *
+ * (C) Copyright 2019 NXP
+ * Chuanhua Han <chuanhua.han@nxp.com>
*/
/*
@@ -13,6 +16,7 @@
#include <common.h>
#include <command.h>
+#include <dm.h>
#include <rtc.h>
#include <i2c.h>
@@ -50,6 +54,7 @@
#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 +169,105 @@ 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)
+{
+ 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);
+ return -EINVAL;
+ }
+
+ 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 0;
+}
+
+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