[U-Boot] [RFC PATCH 12/29] drivers: rtc: ds1337: add driver model support
Suneel Garapati
suneelglinux at gmail.com
Tue Oct 29 21:08:04 UTC 2019
From: Suneel Garapati <sgarapati at marvell.com>
Add DM support to dallas 1337 RTC driver.
Signed-off-by: Suneel Garapati <sgarapati at marvell.com>
---
drivers/rtc/Kconfig | 7 ++
drivers/rtc/ds1337.c | 170 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 177 insertions(+)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8778cc7b26..c31c6a3368 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -54,6 +54,13 @@ config RTC_DS1307
Support for Dallas Semiconductor (now Maxim) DS1307 and DS1338/9 and
compatible Real Time Clock devices.
+config RTC_DS1337
+ bool "Enable DS1337 driver"
+ depends on DM_RTC
+ help
+ Support for Dallas Semiconductor (now Maxim) DS1337/39 and DS1388 and
+ compatible Real Time Clock devices.
+
config RTC_ISL1208
bool "Enable ISL1208 driver"
depends on DM_RTC
diff --git a/drivers/rtc/ds1337.c b/drivers/rtc/ds1337.c
index 9b31048e97..a1c63ffa08 100644
--- a/drivers/rtc/ds1337.c
+++ b/drivers/rtc/ds1337.c
@@ -1,8 +1,11 @@
// SPDX-License-Identifier: GPL-2.0+
/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
* (C) Copyright 2001-2008
* Wolfgang Denk, DENX Software Engineering, wd at denx.de.
* Keith Outwater, keith_outwater at mvis.com`
+ *
*/
/*
@@ -14,6 +17,10 @@
#include <command.h>
#include <rtc.h>
#include <i2c.h>
+#include <dm.h>
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
/*
* RTC register addresses
@@ -59,6 +66,167 @@
#define RTC_STAT_BIT_A2F 0x2 /* Alarm 2 flag */
#define RTC_STAT_BIT_OSF 0x80 /* Oscillator stop flag */
+#ifdef CONFIG_DM_RTC
+
+/*
+ * Helper functions
+ */
+static uchar dm_rtc_read(struct udevice *dev, uchar reg)
+{
+ return dm_i2c_reg_read(dev, reg);
+}
+
+static void dm_rtc_write(struct udevice *dev, uchar reg, uchar val)
+{
+ dm_i2c_reg_write(dev, reg, val);
+}
+
+static int ds1337_rtc_get(struct udevice *dev, struct rtc_time *tmp)
+{
+ int rel = 0;
+ uchar sec, min, hour, mday, wday, mon_cent, year, control, status;
+
+ control = dm_rtc_read(dev, RTC_CTL_REG_ADDR);
+ status = dm_rtc_read(dev, RTC_STAT_REG_ADDR);
+ sec = dm_rtc_read(dev, RTC_SEC_REG_ADDR);
+ min = dm_rtc_read(dev, RTC_MIN_REG_ADDR);
+ hour = dm_rtc_read(dev, RTC_HR_REG_ADDR);
+ wday = dm_rtc_read(dev, RTC_DAY_REG_ADDR);
+ mday = dm_rtc_read(dev, RTC_DATE_REG_ADDR);
+ mon_cent = dm_rtc_read(dev, RTC_MON_REG_ADDR);
+ year = dm_rtc_read(dev, RTC_YR_REG_ADDR);
+
+ /* No century bit, assume year 2000 */
+#ifdef CONFIG_RTC_DS1388
+ mon_cent |= 0x80;
+#endif
+
+ debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x",
+ year, mon_cent, mday, wday);
+ debug(" hr: %02x min: %02x sec: %02x control: %02x status: %02x\n",
+ hour, min, sec, control, status);
+
+ if (status & RTC_STAT_BIT_OSF) {
+ printf("### Warning: RTC oscillator has stopped\n");
+ /* clear the OSF flag */
+ dm_rtc_write(dev, RTC_STAT_REG_ADDR,
+ dm_rtc_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) ? 2100 : 2000);
+ 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 ds1337_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);
+
+ if (tmp->tm_year < 2000 || tmp->tm_year > 2199)
+ return -1;
+
+ dm_rtc_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100));
+
+ /* Assume 20YY as base, to fix mismatch with linux */
+ century = (tmp->tm_year >= 2100) ? 0x80 : 0;
+ dm_rtc_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon) | century);
+
+ dm_rtc_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1));
+ dm_rtc_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday));
+ dm_rtc_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour));
+ dm_rtc_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min));
+ dm_rtc_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec));
+
+ return 0;
+}
+
+/*
+ * Reset the RTC. We also enable the oscillator output on the
+ * SQW/INTB* pin and program it for 32,768 Hz output. Note that
+ * according to the datasheet, turning on the square wave output
+ * increases the current drain on the backup battery from about
+ * 600 nA to 2uA. Define CONFIG_RTC_DS1337_NOOSC if you wish to turn
+ * off the OSC output.
+ */
+static int ds1337_rtc_reset(struct udevice *dev)
+{
+ uchar resetval = RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2; /* Default DS1337 */
+
+#ifdef CONFIG_RTC_DS1337_NOOSC
+ resetval |= RTC_CTL_BIT_INTCN;
+#elif defined CONFIG_RTC_DS1388
+ resetval = 0x0;
+#endif
+ dm_rtc_write(dev, RTC_CTL_REG_ADDR, resetval);
+
+#ifdef CONFIG_DS1339_TCR_VAL
+ dm_rtc_write(dev, RTC_TC_REG_ADDR, CONFIG_SYS_DS1339_TCR_VAL);
+#endif
+#ifdef CONFIG_DS1388_TCR_VAL
+ dm_rtc_write(dev, RTC_TC_REG_ADDR, CONFIG_SYS_DS1388_TCR_VAL);
+#endif
+ return 0;
+}
+
+static int ds1337_rtc_read8(struct udevice *dev, unsigned int reg)
+{
+ return dm_rtc_read(dev, reg);
+}
+
+static int ds1337_rtc_write8(struct udevice *dev, unsigned int reg, int val)
+{
+ dm_rtc_write(dev, reg, val);
+
+ return 0;
+}
+
+static int ds1337_rtc_probe(struct udevice *dev)
+{
+ ds1337_rtc_reset(dev);
+
+ return 0;
+}
+
+static const struct rtc_ops ds1337_rtc_ops = {
+ .get = ds1337_rtc_get,
+ .set = ds1337_rtc_set,
+ .reset = ds1337_rtc_reset,
+ .read8 = ds1337_rtc_read8,
+ .write8 = ds1337_rtc_write8,
+};
+
+static const struct udevice_id ds1337_rtc_ids[] = {
+ { .compatible = "dallas,ds1337" },
+ { }
+};
+
+U_BOOT_DRIVER(ds1337_rtc) = {
+ .name = "rtc-ds1337",
+ .id = UCLASS_RTC,
+ .of_match = ds1337_rtc_ids,
+ .probe = ds1337_rtc_probe,
+ .ops = &ds1337_rtc_ops,
+};
+
+#else /* !CONFIG_DM_RTC */
static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);
@@ -188,3 +356,5 @@ static void rtc_write (uchar reg, uchar val)
{
i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
}
+
+#endif /* !CONFIG_DM_RTC */
--
2.23.0
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