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Index: sys/conf/files
===================================================================
--- sys/conf/files
+++ sys/conf/files
@@ -1804,6 +1804,7 @@
dev/iicbus/nxprtc.c optional nxprtc | pcf8563
dev/iicbus/ofw_iicbus.c optional fdt iicbus
dev/iicbus/rtc8583.c optional rtc8583
+dev/iicbus/rx8803.c optional rx8803 iicbus fdt
dev/iicbus/s35390a.c optional s35390a
dev/iicbus/sy8106a.c optional sy8106a ext_resources fdt
dev/iicbus/tca6416.c optional tca6416 fdt
Index: sys/dev/iicbus/rx8803.c
===================================================================
--- /dev/null
+++ sys/dev/iicbus/rx8803.c
@@ -0,0 +1,246 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2020 Alstom Group.
+ * Copyright (c) 2020 Semihalf.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/clock.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/iicbus/iiconf.h>
+#include <dev/iicbus/iicbus.h>
+
+#include "clock_if.h"
+#include "iicbus_if.h"
+
+#define BIT(x) (1 << (x))
+
+#define RX8803_TIME 0x0
+#define RX8803_FLAGS 0xE
+#define RX8803_CTRL 0xF
+
+#define RX8803_FLAGS_V1F BIT(0)
+#define RX8803_FLAGS_V2F BIT(1)
+
+#define RX8803_CTRL_DISABLE BIT(0)
+
+#define HALF_OF_SEC_NS 500000000
+#define MAX_WRITE_LEN 16
+
+struct rx8803_time {
+ uint8_t sec;
+ uint8_t min;
+ uint8_t hour;
+ uint8_t dow;
+ uint8_t day;
+ uint8_t mon;
+ uint8_t year;
+};
+
+static int rx8803_probe(device_t dev);
+static int rx8803_attach(device_t dev);
+static int rx8803_detach(device_t dev);
+
+static int rx8803_gettime(device_t dev, struct timespec *ts);
+static int rx8803_settime(device_t dev, struct timespec *ts);
+
+static int rx8803_check_status(device_t dev);
+
+static int
+rx8803_check_status(device_t dev)
+{
+ uint8_t flags;
+ int rc;
+
+ rc = iicdev_readfrom(dev, RX8803_FLAGS, &flags, 1, IIC_WAIT);
+ if (rc != 0)
+ return (rc);
+
+ if (flags & RX8803_FLAGS_V2F) {
+ device_printf(dev, "Low voltage flag set, date is incorrect\n");
+ return (ENXIO);
+ }
+
+ return (0);
+}
+
+static int
+rx8803_gettime(device_t dev, struct timespec *ts)
+{
+ struct rx8803_time data;
+ struct bcd_clocktime bcd;
+ int rc;
+
+ rc = rx8803_check_status(dev);
+ if (rc != 0)
+ return (rc);
+
+ rc = iicdev_readfrom(dev,
+ RX8803_TIME,
+ &data, sizeof(struct rx8803_time),
+ IIC_WAIT);
+ if (rc != 0)
+ return (rc);
+
+ bcd.nsec = 0;
+ bcd.sec = data.sec & 0x7F;
+ bcd.min = data.min & 0x7F;
+ bcd.hour = data.hour & 0x3F;
+ bcd.dow = flsl(data.dow & 0x7F) - 1;
+ bcd.day = data.day & 0x3F;
+ bcd.mon = (data.mon & 0x1F);
+ bcd.year = data.year;
+
+ clock_dbgprint_bcd(dev, CLOCK_DBG_READ, &bcd);
+
+ rc = clock_bcd_to_ts(&bcd, ts, false);
+ return (rc);
+}
+
+static int
+rx8803_settime(device_t dev, struct timespec *ts)
+{
+ struct rx8803_time data;
+ struct bcd_clocktime bcd;
+ device_t bus;
+ uint8_t reg;
+ int rc;
+
+ bus = device_get_parent(dev);
+
+ ts->tv_sec -= utc_offset();
+ clock_ts_to_bcd(ts, &bcd, false);
+ clock_dbgprint_bcd(dev, CLOCK_DBG_WRITE, &bcd);
+
+ data.sec = bcd.sec;
+ data.min = bcd.min;
+ data.hour = bcd.hour;
+ data.dow = 1 << bcd.dow;
+ data.day = bcd.day;
+ data.mon = bcd.mon;
+ data.year = bcd.year;
+
+ if (ts->tv_nsec > HALF_OF_SEC_NS)
+ data.sec++;
+
+ /* First disable clock. */
+ rc = iicdev_readfrom(dev, RX8803_CTRL, &reg, sizeof(uint8_t), IIC_WAIT);
+ if (rc != 0)
+ return (rc);
+
+ reg |= RX8803_CTRL_DISABLE;
+
+ rc = iicdev_writeto(dev, RX8803_CTRL, &reg, sizeof(uint8_t), IIC_WAIT);
+ if (rc != 0)
+ return (rc);
+
+ /* Update the date. */
+ rc = iicdev_writeto(dev,
+ RX8803_TIME,
+ &data, sizeof(struct rx8803_time),
+ IIC_WAIT);
+ if (rc != 0)
+ return (rc);
+
+ /* Now restart it. */
+ reg &= ~RX8803_CTRL_DISABLE;
+ rc = iicdev_writeto(dev, RX8803_CTRL, &reg, sizeof(uint8_t), IIC_WAIT);
+ if (rc != 0)
+ return (rc);
+
+ /* Clear low voltage flags, as we have just updated the clock. */
+ rc = iicdev_readfrom(dev, RX8803_FLAGS, &reg, sizeof(uint8_t), IIC_WAIT);
+ if (rc != 0)
+ return (rc);
+
+ reg &= ~(RX8803_FLAGS_V1F | RX8803_FLAGS_V2F);
+ rc = iicdev_writeto(dev, RX8803_FLAGS, &reg, sizeof(uint8_t), IIC_WAIT);
+ return (rc);
+}
+
+static int
+rx8803_probe(device_t dev)
+{
+
+ if (!ofw_bus_is_compatible(dev, "epson,rx8803"))
+ return (ENXIO);
+
+ device_set_desc(dev, "Epson RX8803 Real Time Clock");
+
+ return (BUS_PROBE_GENERIC);
+}
+
+static int
+rx8803_attach(device_t dev)
+{
+
+ /* Set 1 sec resolution. */
+ clock_register_flags(dev, 1000000, 0);
+ clock_schedule(dev, 1);
+
+ return (0);
+
+}
+
+static int
+rx8803_detach(device_t dev)
+{
+
+ clock_unregister(dev);
+
+ return (0);
+}
+
+static device_method_t rx8803_methods[] = {
+ DEVMETHOD(device_probe, rx8803_probe),
+ DEVMETHOD(device_attach, rx8803_attach),
+ DEVMETHOD(device_detach, rx8803_detach),
+
+ DEVMETHOD(clock_gettime, rx8803_gettime),
+ DEVMETHOD(clock_settime, rx8803_settime),
+
+ DEVMETHOD_END,
+};
+
+static driver_t rx8803_driver = {
+ "rx8803",
+ rx8803_methods,
+ 0, /* We don't need softc for this one. */
+};
+
+static devclass_t rx8803_devclass;
+
+DRIVER_MODULE(rx8803, iicbus, rx8803_driver, rx8803_devclass, NULL, NULL);
+MODULE_DEPEND(rx8803, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
Index: sys/modules/i2c/Makefile
===================================================================
--- sys/modules/i2c/Makefile
+++ sys/modules/i2c/Makefile
@@ -25,7 +25,8 @@
smbus \
.if !empty(OPT_FDT)
-SUBDIR += tca6416
+SUBDIR += tca6416 \
+ rx8803
.endif
.include <bsd.subdir.mk>
Index: sys/modules/i2c/rx8803/Makefile
===================================================================
--- /dev/null
+++ sys/modules/i2c/rx8803/Makefile
@@ -0,0 +1,16 @@
+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/dev/iicbus
+KMOD = rx8803
+SRCS = rx8803.c
+
+# Generated files...
+SRCS+= \
+ bus_if.h \
+ clock_if.h \
+ device_if.h \
+ iicbus_if.h \
+ opt_platform.h \
+ ofw_bus_if.h \
+
+.include <bsd.kmod.mk>

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