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da9063_rtc: Add new driver for the Dialog Semiconductor DA9063 RTC
This is a simple RTC present in the PMIC, supporting 1s precision. This is the PMIC on SiFive's HiFive Unmatched. Reviewed by: mhorne, imp MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D36200
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80466455ad
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129028c79c
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@ -1588,6 +1588,7 @@ dev/dcons/dcons_crom.c optional dcons_crom
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dev/dcons/dcons_os.c optional dcons
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dev/dialog/da9063/da9063_if.m optional da9063_pmic
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dev/dialog/da9063/da9063_iic.c optional da9063_pmic iicbus fdt
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dev/dialog/da9063/da9063_rtc.c optional da9063_rtc fdt
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dev/dme/if_dme.c optional dme
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dev/drm2/drm_agpsupport.c optional drm2
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dev/drm2/drm_auth.c optional drm2
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293
sys/dev/dialog/da9063/da9063_rtc.c
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293
sys/dev/dialog/da9063/da9063_rtc.c
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@ -0,0 +1,293 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2022 Jessica Clarke <jrtc27@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Dialog Semiconductor DA9063 RTC */
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <dev/dialog/da9063/da9063reg.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "clock_if.h"
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#include "da9063_if.h"
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#define DA9063_RTC_BASE_YEAR 2000
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struct da9063_rtc_softc {
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device_t dev;
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device_t parent;
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struct mtx mtx;
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};
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#define DA9063_RTC_LOCK(sc) mtx_lock(&(sc)->mtx)
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#define DA9063_RTC_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
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#define DA9063_RTC_ASSERT_LOCKED(sc) mtx_assert(&(sc)->mtx, MA_OWNED);
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#define DA9063_RTC_ASSERT_UNLOCKED(sc) mtx_assert(&(sc)->mtx, MA_NOTOWNED);
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static struct ofw_compat_data compat_data[] = {
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{ "dlg,da9063-rtc", 1 },
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{ NULL, 0 }
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};
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static int
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da9063_rtc_read_ct(struct da9063_rtc_softc *sc, struct clocktime *ct)
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{
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uint8_t sec, min, hour, day, mon, year;
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int error;
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DA9063_RTC_ASSERT_LOCKED(sc)
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error = DA9063_READ(sc->parent, DA9063_COUNT_S, &sec);
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if (error != 0)
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return (error);
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if ((sec & DA9063_COUNT_S_RTC_READ) == 0)
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return (EAGAIN);
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error = DA9063_READ(sc->parent, DA9063_COUNT_MI, &min);
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if (error != 0)
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return (error);
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error = DA9063_READ(sc->parent, DA9063_COUNT_H, &hour);
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if (error != 0)
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return (error);
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error = DA9063_READ(sc->parent, DA9063_COUNT_D, &day);
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if (error != 0)
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return (error);
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error = DA9063_READ(sc->parent, DA9063_COUNT_MO, &mon);
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if (error != 0)
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return (error);
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error = DA9063_READ(sc->parent, DA9063_COUNT_Y, &year);
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if (error != 0)
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return (error);
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ct->nsec = 0;
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ct->dow = -1;
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ct->sec = sec & DA9063_COUNT_S_COUNT_SEC_MASK;
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ct->min = min & DA9063_COUNT_MI_COUNT_MIN_MASK;
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ct->hour = hour & DA9063_COUNT_H_COUNT_HOUR_MASK;
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ct->day = day & DA9063_COUNT_D_COUNT_DAY_MASK;
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ct->mon = mon & DA9063_COUNT_MO_COUNT_MONTH_MASK;
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ct->year = (year & DA9063_COUNT_Y_COUNT_YEAR_MASK) +
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DA9063_RTC_BASE_YEAR;
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return (0);
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}
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static int
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da9063_rtc_write_ct(struct da9063_rtc_softc *sc, struct clocktime *ct)
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{
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int error;
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DA9063_RTC_ASSERT_LOCKED(sc)
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error = DA9063_WRITE(sc->parent, DA9063_COUNT_S, ct->sec);
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if (error != 0)
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return (error);
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error = DA9063_WRITE(sc->parent, DA9063_COUNT_MI, ct->min);
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if (error != 0)
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return (error);
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error = DA9063_WRITE(sc->parent, DA9063_COUNT_H, ct->hour);
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if (error != 0)
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return (error);
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error = DA9063_WRITE(sc->parent, DA9063_COUNT_D, ct->day);
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if (error != 0)
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return (error);
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error = DA9063_WRITE(sc->parent, DA9063_COUNT_MO, ct->mon);
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if (error != 0)
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return (error);
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error = DA9063_WRITE(sc->parent, DA9063_COUNT_Y,
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(ct->year - DA9063_RTC_BASE_YEAR) &
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DA9063_COUNT_Y_COUNT_YEAR_MASK);
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if (error != 0)
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return (error);
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return (0);
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}
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static int
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da9063_rtc_gettime(device_t dev, struct timespec *ts)
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{
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struct da9063_rtc_softc *sc;
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struct clocktime ct, oldct;
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int error;
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sc = device_get_softc(dev);
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DA9063_RTC_LOCK(sc);
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error = da9063_rtc_read_ct(sc, &ct);
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if (error != 0)
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goto error;
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/*
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* Reading seconds only latches the other registers for "approx 0.5s",
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* which should almost always be sufficient but is not guaranteed to
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* be, so re-read to get a consistent set of values.
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*/
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do {
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oldct = ct;
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error = da9063_rtc_read_ct(sc, &ct);
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if (error != 0)
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goto error;
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} while (ct.min != oldct.min || ct.hour != oldct.hour ||
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ct.day != oldct.day || ct.mon != oldct.mon ||
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ct.year != oldct.year);
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DA9063_RTC_UNLOCK(sc);
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error = clock_ct_to_ts(&ct, ts);
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if (error != 0)
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return (error);
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return (0);
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error:
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DA9063_RTC_UNLOCK(sc);
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return (error);
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}
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static int
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da9063_rtc_settime(device_t dev, struct timespec *ts)
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{
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struct da9063_rtc_softc *sc;
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struct clocktime ct;
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int error;
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sc = device_get_softc(dev);
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/*
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* We request a timespec with no resolution-adjustment. That also
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* disables utc adjustment, so apply that ourselves.
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*/
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ts->tv_sec -= utc_offset();
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clock_ts_to_ct(ts, &ct);
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DA9063_RTC_LOCK(sc);
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error = da9063_rtc_write_ct(sc, &ct);
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DA9063_RTC_UNLOCK(sc);
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return (error);
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}
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static int
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da9063_rtc_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Dialog DA9063 RTC");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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da9063_rtc_attach(device_t dev)
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{
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struct da9063_rtc_softc *sc;
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int error;
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sc = device_get_softc(dev);
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sc->dev = dev;
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sc->parent = device_get_parent(dev);
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/* Power on RTC and 32 kHz oscillator */
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error = DA9063_MODIFY(sc->parent, DA9063_CONTROL_E, 0,
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DA9063_CONTROL_E_RTC_EN);
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if (error != 0)
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return (error);
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/* Connect 32 kHz oscillator */
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error = DA9063_MODIFY(sc->parent, DA9063_EN_32K, 0,
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DA9063_EN_32K_CRYSTAL);
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if (error != 0)
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return (error);
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/* Disable alarms */
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error = DA9063_MODIFY(sc->parent, DA9063_ALARM_Y,
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DA9063_ALARM_Y_ALARM_ON | DA9063_ALARM_Y_TICK_ON, 0);
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if (error != 0)
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return (error);
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mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);
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/*
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* Register as a system realtime clock with 1 second resolution.
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*/
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clock_register_flags(dev, 1000000, CLOCKF_SETTIME_NO_ADJ);
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clock_schedule(dev, 1);
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return (0);
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}
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static int
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da9063_rtc_detach(device_t dev)
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{
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struct da9063_rtc_softc *sc;
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sc = device_get_softc(dev);
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clock_unregister(dev);
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mtx_destroy(&sc->mtx);
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return (0);
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}
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static device_method_t da9063_rtc_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, da9063_rtc_probe),
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DEVMETHOD(device_attach, da9063_rtc_attach),
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DEVMETHOD(device_detach, da9063_rtc_detach),
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/* Clock interface */
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DEVMETHOD(clock_gettime, da9063_rtc_gettime),
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DEVMETHOD(clock_settime, da9063_rtc_settime),
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DEVMETHOD_END,
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};
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DEFINE_CLASS_0(da9063_rtc, da9063_rtc_driver, da9063_rtc_methods,
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sizeof(struct da9063_rtc_softc));
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DRIVER_MODULE(da9063_rtc, da9063_pmic, da9063_rtc_driver, NULL, NULL);
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