--- /dev/null
+/* $OpenBSD: pcf85063.c,v 1.1 2021/11/22 20:20:20 kettenis Exp $ */
+
+/*
+ * Copyright (c) 2005 Kimihiro Nonaka
+ * Copyright (c) 2016, 2021 Mark Kettenis
+ * All rights reserved.
+ *
+ * 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 WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
+ * 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/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+
+#include <dev/clock_subr.h>
+
+#include <dev/i2c/i2cvar.h>
+
+/*
+ * PCF85063A/TP Real-Time Clock
+ */
+
+#define PCF85063_CONTROL1 0x00
+#define PCF85063_SECONDS 0x04
+#define PCF85063_MINUTES 0x05
+#define PCF85063_HOURS 0x06
+#define PCF85063_DAY 0x07
+#define PCF85063_WDAY 0x08
+#define PCF85063_MONTH 0x09
+#define PCF85063_YEAR 0x0a
+
+#define PCF85063_NRTC_REGS 7
+
+/*
+ * Bit definitions.
+ */
+#define PCF85063_CONTROL1_12_24 (1 << 1)
+#define PCF85063_CONTROL1_STOP (1 << 5)
+#define PCF85063_SECONDS_MASK 0x7f
+#define PCF85063_SECONDS_OS (1 << 7)
+#define PCF85063_MINUTES_MASK 0x7f
+#define PCF85063_HOURS_12HRS_PM (1 << 5) /* If 12 hr mode, set = PM */
+#define PCF85063_HOURS_12MASK 0x1f
+#define PCF85063_HOURS_24MASK 0x3f
+#define PCF85063_DAY_MASK 0x3f
+#define PCF85063_WDAY_MASK 0x07
+#define PCF85063_MONTH_MASK 0x1f
+
+struct pcyrtc_softc {
+ struct device sc_dev;
+ i2c_tag_t sc_tag;
+ int sc_address;
+ struct todr_chip_handle sc_todr;
+};
+
+int pcyrtc_match(struct device *, void *, void *);
+void pcyrtc_attach(struct device *, struct device *, void *);
+
+struct cfattach pcyrtc_ca = {
+ sizeof(struct pcyrtc_softc), pcyrtc_match, pcyrtc_attach
+};
+
+struct cfdriver pcyrtc_cd = {
+ NULL, "pcyrtc", DV_DULL
+};
+
+uint8_t pcyrtc_reg_read(struct pcyrtc_softc *, int);
+void pcyrtc_reg_write(struct pcyrtc_softc *, int, uint8_t);
+int pcyrtc_clock_read(struct pcyrtc_softc *, struct clock_ymdhms *);
+int pcyrtc_clock_write(struct pcyrtc_softc *, struct clock_ymdhms *);
+int pcyrtc_gettime(struct todr_chip_handle *, struct timeval *);
+int pcyrtc_settime(struct todr_chip_handle *, struct timeval *);
+
+int
+pcyrtc_match(struct device *parent, void *v, void *arg)
+{
+ struct i2c_attach_args *ia = arg;
+
+ if (strcmp(ia->ia_name, "nxp,pcf85063a") == 0)
+ return (1);
+
+ return (0);
+}
+
+void
+pcyrtc_attach(struct device *parent, struct device *self, void *arg)
+{
+ struct pcyrtc_softc *sc = (struct pcyrtc_softc *)self;
+ struct i2c_attach_args *ia = arg;
+ uint8_t reg;
+
+ sc->sc_tag = ia->ia_tag;
+ sc->sc_address = ia->ia_addr;
+ sc->sc_todr.cookie = sc;
+ sc->sc_todr.todr_gettime = pcyrtc_gettime;
+ sc->sc_todr.todr_settime = pcyrtc_settime;
+ todr_attach(&sc->sc_todr);
+
+ /*
+ * Switch to 24 hour mode.
+ */
+ reg = pcyrtc_reg_read(sc, PCF85063_CONTROL1);
+ reg &= ~PCF85063_CONTROL1_12_24;
+ reg &= ~PCF85063_CONTROL1_STOP;
+ pcyrtc_reg_write(sc, PCF85063_CONTROL1, reg);
+
+ printf("\n");
+}
+
+int
+pcyrtc_gettime(struct todr_chip_handle *ch, struct timeval *tv)
+{
+ struct pcyrtc_softc *sc = ch->cookie;
+ struct clock_ymdhms dt;
+
+ memset(&dt, 0, sizeof(dt));
+ if (pcyrtc_clock_read(sc, &dt) == 0)
+ return (-1);
+
+ tv->tv_sec = clock_ymdhms_to_secs(&dt);
+ tv->tv_usec = 0;
+ return (0);
+}
+
+int
+pcyrtc_settime(struct todr_chip_handle *ch, struct timeval *tv)
+{
+ struct pcyrtc_softc *sc = ch->cookie;
+ struct clock_ymdhms dt;
+ uint8_t reg;
+
+ clock_secs_to_ymdhms(tv->tv_sec, &dt);
+ if (pcyrtc_clock_write(sc, &dt) == 0)
+ return (-1);
+
+ /* Clear OS flag. */
+ reg = pcyrtc_reg_read(sc, PCF85063_SECONDS);
+ if (reg & PCF85063_SECONDS_OS) {
+ reg &= ~PCF85063_SECONDS_OS;
+ pcyrtc_reg_write(sc, PCF85063_SECONDS, reg);
+ }
+
+ return (0);
+}
+
+uint8_t
+pcyrtc_reg_read(struct pcyrtc_softc *sc, int reg)
+{
+ uint8_t cmd = reg;
+ uint8_t val;
+
+ iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+ if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
+ NULL, 0, &cmd, sizeof cmd, I2C_F_POLL) ||
+ iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address,
+ NULL, 0, &val, sizeof val, I2C_F_POLL)) {
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+ printf("%s: pcyrtc_reg_read: failed to read reg%d\n",
+ sc->sc_dev.dv_xname, reg);
+ return 0;
+ }
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+ return val;
+}
+
+void
+pcyrtc_reg_write(struct pcyrtc_softc *sc, int reg, uint8_t val)
+{
+ uint8_t cmd = reg;
+
+ iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+ if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
+ &cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL)) {
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+ printf("%s: pcyrtc_reg_write: failed to write reg%d\n",
+ sc->sc_dev.dv_xname, reg);
+ return;
+ }
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+}
+
+int
+pcyrtc_clock_read(struct pcyrtc_softc *sc, struct clock_ymdhms *dt)
+{
+ uint8_t regs[PCF85063_NRTC_REGS];
+ uint8_t cmd = PCF85063_SECONDS;
+
+ iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+ if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address,
+ &cmd, sizeof cmd, regs, PCF85063_NRTC_REGS, I2C_F_POLL)) {
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+ printf("%s: pcyrtc_clock_read: failed to read rtc\n",
+ sc->sc_dev.dv_xname);
+ return (0);
+ }
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+
+ /*
+ * Convert the PCF85063's register values into something useable
+ */
+ dt->dt_sec = FROMBCD(regs[0] & PCF85063_SECONDS_MASK);
+ dt->dt_min = FROMBCD(regs[1] & PCF85063_MINUTES_MASK);
+ dt->dt_hour = FROMBCD(regs[2] & PCF85063_HOURS_24MASK);
+ dt->dt_day = FROMBCD(regs[3] & PCF85063_DAY_MASK);
+ dt->dt_mon = FROMBCD(regs[5] & PCF85063_MONTH_MASK);
+ dt->dt_year = FROMBCD(regs[6]) + 2000;
+
+ if (regs[0] & PCF85063_SECONDS_OS)
+ return (0);
+
+ return (1);
+}
+
+int
+pcyrtc_clock_write(struct pcyrtc_softc *sc, struct clock_ymdhms *dt)
+{
+ uint8_t regs[PCF85063_NRTC_REGS];
+ uint8_t cmd = PCF85063_SECONDS;
+
+ /*
+ * Convert our time representation into something the PCF85063
+ * can understand.
+ */
+ regs[0] = TOBCD(dt->dt_sec);
+ regs[1] = TOBCD(dt->dt_min);
+ regs[2] = TOBCD(dt->dt_hour);
+ regs[3] = TOBCD(dt->dt_day);
+ regs[4] = TOBCD(dt->dt_wday);
+ regs[5] = TOBCD(dt->dt_mon);
+ regs[6] = TOBCD(dt->dt_year - 2000);
+
+ iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+ if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
+ &cmd, sizeof cmd, regs, PCF85063_NRTC_REGS, I2C_F_POLL)) {
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+ printf("%s: pcyrtc_clock_write: failed to write rtc\n",
+ sc->sc_dev.dv_xname);
+ return (0);
+ }
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+ return (1);
+}
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