+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001, 2002, 2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
* 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
*/
/*
* 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 <common.h>
#include <command.h>
+#include <dm.h>
#include <rtc.h>
#include <i2c.h>
-#if defined(CONFIG_CMD_DATE)
-
-/*---------------------------------------------------------------------*/
-#undef DEBUG_RTC
-
-#ifdef DEBUG_RTC
-#define DEBUGR(fmt,args...) printf(fmt ,##args)
-#else
-#define DEBUGR(fmt,args...)
-#endif
-/*---------------------------------------------------------------------*/
-
-#ifndef CONFIG_SYS_I2C_RTC_ADDR
-# define CONFIG_SYS_I2C_RTC_ADDR 0x68
-#endif
-
-#if defined(CONFIG_RTC_DS1307) && (CONFIG_SYS_I2C_SPEED > 100000)
-# error The DS1307 is specified only up to 100kHz!
-#endif
+enum ds_type {
+ ds_1307,
+ ds_1337,
+ ds_1340,
+ m41t11,
+ mcp794xx,
+};
/*
* RTC register addresses
#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
+
+#ifndef CONFIG_DM_RTC
+
+/*---------------------------------------------------------------------*/
+#undef DEBUG_RTC
+
+#ifdef DEBUG_RTC
+#define DEBUGR(fmt, args...) printf(fmt, ##args)
+#else
+#define DEBUGR(fmt, args...)
+#endif
+/*---------------------------------------------------------------------*/
+
+#ifndef CONFIG_SYS_I2C_RTC_ADDR
+# define CONFIG_SYS_I2C_RTC_ADDR 0x68
+#endif
+
+#if defined(CONFIG_RTC_DS1307) && (CONFIG_SYS_I2C_SPEED > 100000)
+# error The DS1307 is specified only up to 100kHz!
+#endif
+
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
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_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);
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;
}
*/
void rtc_reset (void)
{
- struct rtc_time tmp;
-
rtc_write (RTC_SEC_REG_ADDR, 0x00); /* clearing Clock Halt */
rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_SQWE | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS0);
-
- tmp.tm_year = 1970;
- tmp.tm_mon = 1;
- tmp.tm_mday= 1;
- tmp.tm_hour = 0;
- tmp.tm_min = 0;
- tmp.tm_sec = 0;
-
- rtc_set(&tmp);
-
- printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
- tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
- tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
-
- return;
}
i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
}
-static unsigned bcd2bin (uchar n)
+#endif /* !CONFIG_DM_RTC */
+
+#ifdef CONFIG_DM_RTC
+static int ds1307_rtc_set(struct udevice *dev, const struct rtc_time *tm)
{
- return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
+ int ret;
+ uchar buf[7];
+ enum ds_type type = dev_get_driver_data(dev);
+
+ debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
+ tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ if (tm->tm_year < 1970 || tm->tm_year > 2069)
+ printf("WARNING: year should be between 1970 and 2069!\n");
+
+ buf[RTC_YR_REG_ADDR] = bin2bcd(tm->tm_year % 100);
+ buf[RTC_MON_REG_ADDR] = bin2bcd(tm->tm_mon);
+ buf[RTC_DAY_REG_ADDR] = bin2bcd(tm->tm_wday + 1);
+ buf[RTC_DATE_REG_ADDR] = bin2bcd(tm->tm_mday);
+ buf[RTC_HR_REG_ADDR] = bin2bcd(tm->tm_hour);
+ buf[RTC_MIN_REG_ADDR] = bin2bcd(tm->tm_min);
+ buf[RTC_SEC_REG_ADDR] = bin2bcd(tm->tm_sec);
+
+ if (type == mcp794xx) {
+ buf[RTC_DAY_REG_ADDR] |= MCP7941X_BIT_VBATEN;
+ buf[RTC_SEC_REG_ADDR] |= MCP7941X_BIT_ST;
+ }
+
+ ret = dm_i2c_write(dev, 0, buf, sizeof(buf));
+ if (ret < 0)
+ return ret;
+
+ return 0;
}
-static unsigned char bin2bcd (unsigned int n)
+static int ds1307_rtc_get(struct udevice *dev, struct rtc_time *tm)
{
- return (((n / 10) << 4) | (n % 10));
+ int ret;
+ uchar buf[7];
+ enum ds_type type = dev_get_driver_data(dev);
+
+read_rtc:
+ ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
+ if (ret < 0)
+ return ret;
+
+ if (type == ds_1307) {
+ if (buf[RTC_SEC_REG_ADDR] & RTC_SEC_BIT_CH) {
+ printf("### Warning: RTC oscillator has stopped\n");
+ /* clear the CH flag */
+ buf[RTC_SEC_REG_ADDR] &= ~RTC_SEC_BIT_CH;
+ dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
+ buf[RTC_SEC_REG_ADDR]);
+ return -1;
+ }
+ }
+
+ if (type == m41t11) {
+ /* clock halted? turn it on, so clock can tick. */
+ if (buf[RTC_SEC_REG_ADDR] & RTC_SEC_BIT_CH) {
+ buf[RTC_SEC_REG_ADDR] &= ~RTC_SEC_BIT_CH;
+ dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
+ MCP7941X_BIT_ST);
+ dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
+ buf[RTC_SEC_REG_ADDR]);
+ goto read_rtc;
+ }
+ }
+
+ if (type == mcp794xx) {
+ /* make sure that the backup battery is enabled */
+ if (!(buf[RTC_DAY_REG_ADDR] & MCP7941X_BIT_VBATEN)) {
+ dm_i2c_reg_write(dev, RTC_DAY_REG_ADDR,
+ buf[RTC_DAY_REG_ADDR] |
+ MCP7941X_BIT_VBATEN);
+ }
+
+ /* clock halted? turn it on, so clock can tick. */
+ if (!(buf[RTC_SEC_REG_ADDR] & MCP7941X_BIT_ST)) {
+ dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
+ MCP7941X_BIT_ST);
+ printf("Started RTC\n");
+ goto read_rtc;
+ }
+ }
+
+ tm->tm_sec = bcd2bin(buf[RTC_SEC_REG_ADDR] & 0x7F);
+ tm->tm_min = bcd2bin(buf[RTC_MIN_REG_ADDR] & 0x7F);
+ tm->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR] & 0x3F);
+ tm->tm_mday = bcd2bin(buf[RTC_DATE_REG_ADDR] & 0x3F);
+ tm->tm_mon = bcd2bin(buf[RTC_MON_REG_ADDR] & 0x1F);
+ tm->tm_year = bcd2bin(buf[RTC_YR_REG_ADDR]) +
+ (bcd2bin(buf[RTC_YR_REG_ADDR]) >= 70 ?
+ 1900 : 2000);
+ tm->tm_wday = bcd2bin((buf[RTC_DAY_REG_ADDR] - 1) & 0x07);
+ tm->tm_yday = 0;
+ tm->tm_isdst = 0;
+
+ debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
+ tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ return 0;
}
-#endif
+static int ds1307_rtc_reset(struct udevice *dev)
+{
+ int ret;
+
+ /* clear Clock Halt */
+ ret = dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR, 0x00);
+ if (ret < 0)
+ return ret;
+ ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR,
+ RTC_CTL_BIT_SQWE | RTC_CTL_BIT_RS1 |
+ RTC_CTL_BIT_RS0);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int ds1307_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 ds1307_rtc_ops = {
+ .get = ds1307_rtc_get,
+ .set = ds1307_rtc_set,
+ .reset = ds1307_rtc_reset,
+};
+
+static const struct udevice_id ds1307_rtc_ids[] = {
+ { .compatible = "dallas,ds1307", .data = ds_1307 },
+ { .compatible = "dallas,ds1337", .data = ds_1337 },
+ { .compatible = "dallas,ds1340", .data = ds_1340 },
+ { .compatible = "microchip,mcp7941x", .data = mcp794xx },
+ { .compatible = "st,m41t11", .data = m41t11 },
+ { }
+};
+
+U_BOOT_DRIVER(rtc_ds1307) = {
+ .name = "rtc-ds1307",
+ .id = UCLASS_RTC,
+ .probe = ds1307_probe,
+ .of_match = ds1307_rtc_ids,
+ .ops = &ds1307_rtc_ops,
+};
+#endif /* CONFIG_DM_RTC */
projects / oweals / u-boot.git / blobdiff