* Keith Outwater, keith_outwater@mvis.com`
* Steven Scholz, steven.scholz@imc-berlin.de
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*
* Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)
- * DS1307 and DS1338 Real Time Clock (RTC).
+ * DS1307 and DS1338/9 Real Time Clock (RTC).
*
* based on ds1337.c
*/
#include <rtc.h>
#include <i2c.h>
-#if (defined(CONFIG_RTC_DS1307) || defined(CONFIG_RTC_DS1338) ) && \
- defined(CONFIG_CMD_DATE)
+#if defined(CONFIG_CMD_DATE)
/*---------------------------------------------------------------------*/
#undef DEBUG_RTC
#endif
/*---------------------------------------------------------------------*/
-#ifndef CFG_I2C_RTC_ADDR
-# define CFG_I2C_RTC_ADDR 0x68
+#ifndef CONFIG_SYS_I2C_RTC_ADDR
+# define CONFIG_SYS_I2C_RTC_ADDR 0x68
#endif
-#if defined(CONFIG_RTC_DS1307) && (CFG_I2C_SPEED > 100000)
+#if defined(CONFIG_RTC_DS1307) && (CONFIG_SYS_I2C_SPEED > 100000)
# error The DS1307 is specified only up to 100kHz!
#endif
#define RTC_CTL_BIT_SQWE 0x10 /* Square Wave Enable */
#define RTC_CTL_BIT_OUT 0x80 /* Output Control */
+/* MCP7941X-specific bits */
+#define MCP7941X_BIT_ST 0x80
+#define MCP7941X_BIT_VBATEN 0x08
+
static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);
-static uchar bin2bcd (unsigned int n);
-static unsigned bcd2bin (uchar c);
/*
* Get the current time from the RTC
*/
-void rtc_get (struct rtc_time *tmp)
+int rtc_get (struct rtc_time *tmp)
{
+ int rel = 0;
uchar sec, min, hour, mday, wday, mon, year;
+#ifdef CONFIG_RTC_MCP79411
+read_rtc:
+#endif
sec = rtc_read (RTC_SEC_REG_ADDR);
min = rtc_read (RTC_MIN_REG_ADDR);
hour = rtc_read (RTC_HR_REG_ADDR);
"hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday, hour, min, sec);
+#ifdef CONFIG_RTC_DS1307
if (sec & RTC_SEC_BIT_CH) {
printf ("### Warning: RTC oscillator has stopped\n");
/* clear the CH flag */
rtc_write (RTC_SEC_REG_ADDR,
rtc_read (RTC_SEC_REG_ADDR) & ~RTC_SEC_BIT_CH);
+ rel = -1;
}
+#endif
+
+#ifdef CONFIG_RTC_MCP79411
+ /* make sure that the backup battery is enabled */
+ if (!(wday & MCP7941X_BIT_VBATEN)) {
+ rtc_write(RTC_DAY_REG_ADDR,
+ wday | MCP7941X_BIT_VBATEN);
+ }
+
+ /* clock halted? turn it on, so clock can tick. */
+ if (!(sec & MCP7941X_BIT_ST)) {
+ rtc_write(RTC_SEC_REG_ADDR, MCP7941X_BIT_ST);
+ printf("Started RTC\n");
+ goto read_rtc;
+ }
+#endif
+
tmp->tm_sec = bcd2bin (sec & 0x7F);
tmp->tm_min = bcd2bin (min & 0x7F);
DEBUGR ("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;
}
/*
* Set the RTC
*/
-void rtc_set (struct rtc_time *tmp)
+int rtc_set (struct rtc_time *tmp)
{
DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
+#ifdef CONFIG_RTC_MCP79411
+ rtc_write (RTC_DAY_REG_ADDR,
+ bin2bcd (tmp->tm_wday + 1) | MCP7941X_BIT_VBATEN);
+#else
rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
+#endif
rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
+#ifdef CONFIG_RTC_MCP79411
+ rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec) | MCP7941X_BIT_ST);
+#else
rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
+#endif
+
+ return 0;
}
static
uchar rtc_read (uchar reg)
{
- return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg));
+ return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
}
static void rtc_write (uchar reg, uchar val)
{
- i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val);
-}
-
-static unsigned bcd2bin (uchar n)
-{
- return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
-}
-
-static unsigned char bin2bcd (unsigned int n)
-{
- return (((n / 10) << 4) | (n % 10));
+ i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
}
-
#endif