/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2022 Jessica Clarke * * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. */ /* Dialog Semiconductor DA9063 RTC */ #include #include #include #include #include #include #include #include #include #include "clock_if.h" #include "da9063_if.h" #define DA9063_RTC_BASE_YEAR 2000 struct da9063_rtc_softc { device_t dev; device_t parent; struct mtx mtx; }; #define DA9063_RTC_LOCK(sc) mtx_lock(&(sc)->mtx) #define DA9063_RTC_UNLOCK(sc) mtx_unlock(&(sc)->mtx) #define DA9063_RTC_ASSERT_LOCKED(sc) mtx_assert(&(sc)->mtx, MA_OWNED); #define DA9063_RTC_ASSERT_UNLOCKED(sc) mtx_assert(&(sc)->mtx, MA_NOTOWNED); static struct ofw_compat_data compat_data[] = { { "dlg,da9063-rtc", 1 }, { NULL, 0 } }; static int da9063_rtc_read_ct(struct da9063_rtc_softc *sc, struct clocktime *ct) { uint8_t sec, min, hour, day, mon, year; int error; DA9063_RTC_ASSERT_LOCKED(sc) error = DA9063_READ(sc->parent, DA9063_COUNT_S, &sec); if (error != 0) return (error); if ((sec & DA9063_COUNT_S_RTC_READ) == 0) return (EAGAIN); error = DA9063_READ(sc->parent, DA9063_COUNT_MI, &min); if (error != 0) return (error); error = DA9063_READ(sc->parent, DA9063_COUNT_H, &hour); if (error != 0) return (error); error = DA9063_READ(sc->parent, DA9063_COUNT_D, &day); if (error != 0) return (error); error = DA9063_READ(sc->parent, DA9063_COUNT_MO, &mon); if (error != 0) return (error); error = DA9063_READ(sc->parent, DA9063_COUNT_Y, &year); if (error != 0) return (error); ct->nsec = 0; ct->dow = -1; ct->sec = sec & DA9063_COUNT_S_COUNT_SEC_MASK; ct->min = min & DA9063_COUNT_MI_COUNT_MIN_MASK; ct->hour = hour & DA9063_COUNT_H_COUNT_HOUR_MASK; ct->day = day & DA9063_COUNT_D_COUNT_DAY_MASK; ct->mon = mon & DA9063_COUNT_MO_COUNT_MONTH_MASK; ct->year = (year & DA9063_COUNT_Y_COUNT_YEAR_MASK) + DA9063_RTC_BASE_YEAR; return (0); } static int da9063_rtc_write_ct(struct da9063_rtc_softc *sc, struct clocktime *ct) { int error; DA9063_RTC_ASSERT_LOCKED(sc) error = DA9063_WRITE(sc->parent, DA9063_COUNT_S, ct->sec); if (error != 0) return (error); error = DA9063_WRITE(sc->parent, DA9063_COUNT_MI, ct->min); if (error != 0) return (error); error = DA9063_WRITE(sc->parent, DA9063_COUNT_H, ct->hour); if (error != 0) return (error); error = DA9063_WRITE(sc->parent, DA9063_COUNT_D, ct->day); if (error != 0) return (error); error = DA9063_WRITE(sc->parent, DA9063_COUNT_MO, ct->mon); if (error != 0) return (error); error = DA9063_WRITE(sc->parent, DA9063_COUNT_Y, (ct->year - DA9063_RTC_BASE_YEAR) & DA9063_COUNT_Y_COUNT_YEAR_MASK); if (error != 0) return (error); return (0); } static int da9063_rtc_gettime(device_t dev, struct timespec *ts) { struct da9063_rtc_softc *sc; struct clocktime ct, oldct; int error; sc = device_get_softc(dev); DA9063_RTC_LOCK(sc); error = da9063_rtc_read_ct(sc, &ct); if (error != 0) goto error; /* * Reading seconds only latches the other registers for "approx 0.5s", * which should almost always be sufficient but is not guaranteed to * be, so re-read to get a consistent set of values. */ do { oldct = ct; error = da9063_rtc_read_ct(sc, &ct); if (error != 0) goto error; } while (ct.min != oldct.min || ct.hour != oldct.hour || ct.day != oldct.day || ct.mon != oldct.mon || ct.year != oldct.year); DA9063_RTC_UNLOCK(sc); error = clock_ct_to_ts(&ct, ts); if (error != 0) return (error); return (0); error: DA9063_RTC_UNLOCK(sc); return (error); } static int da9063_rtc_settime(device_t dev, struct timespec *ts) { struct da9063_rtc_softc *sc; struct clocktime ct; int error; sc = device_get_softc(dev); /* * We request a timespec with no resolution-adjustment. That also * disables utc adjustment, so apply that ourselves. */ ts->tv_sec -= utc_offset(); clock_ts_to_ct(ts, &ct); DA9063_RTC_LOCK(sc); error = da9063_rtc_write_ct(sc, &ct); DA9063_RTC_UNLOCK(sc); return (error); } static int da9063_rtc_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) return (ENXIO); device_set_desc(dev, "Dialog DA9063 RTC"); return (BUS_PROBE_DEFAULT); } static int da9063_rtc_attach(device_t dev) { struct da9063_rtc_softc *sc; int error; sc = device_get_softc(dev); sc->dev = dev; sc->parent = device_get_parent(dev); /* Power on RTC and 32 kHz oscillator */ error = DA9063_MODIFY(sc->parent, DA9063_CONTROL_E, 0, DA9063_CONTROL_E_RTC_EN); if (error != 0) return (error); /* Connect 32 kHz oscillator */ error = DA9063_MODIFY(sc->parent, DA9063_EN_32K, 0, DA9063_EN_32K_CRYSTAL); if (error != 0) return (error); /* Disable alarms */ error = DA9063_MODIFY(sc->parent, DA9063_ALARM_Y, DA9063_ALARM_Y_ALARM_ON | DA9063_ALARM_Y_TICK_ON, 0); if (error != 0) return (error); mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF); /* * Register as a system realtime clock with 1 second resolution. */ clock_register_flags(dev, 1000000, CLOCKF_SETTIME_NO_ADJ); clock_schedule(dev, 1); return (0); } static int da9063_rtc_detach(device_t dev) { struct da9063_rtc_softc *sc; sc = device_get_softc(dev); clock_unregister(dev); mtx_destroy(&sc->mtx); return (0); } static device_method_t da9063_rtc_methods[] = { /* Device interface */ DEVMETHOD(device_probe, da9063_rtc_probe), DEVMETHOD(device_attach, da9063_rtc_attach), DEVMETHOD(device_detach, da9063_rtc_detach), /* Clock interface */ DEVMETHOD(clock_gettime, da9063_rtc_gettime), DEVMETHOD(clock_settime, da9063_rtc_settime), DEVMETHOD_END, }; DEFINE_CLASS_0(da9063_rtc, da9063_rtc_driver, da9063_rtc_methods, sizeof(struct da9063_rtc_softc)); DRIVER_MODULE(da9063_rtc, da9063_pmic, da9063_rtc_driver, NULL, NULL);