arm64: Add a driver for the Arm PL031 RTC
It is a simple RTC found in some Arm SoCs, e.g. the Arm Juno. Reviewed by: manu Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D41267
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sys/arm64/arm64/pl031_rtc.c
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sys/arm64/arm64/pl031_rtc.c
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2023 Arm Ltd
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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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/*
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* Driver for the Arm PL031 RTC device
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "clock_if.h"
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#define RTCDR 0x00
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#define RTCMR 0x04
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#define RTCLR 0x08
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#define RTCCR 0x0c
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#define RTCIMSR 0x10
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#define RTCRIS 0x14
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#define RTCMIS 0x18
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#define RTCICR 0x1c
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struct pl031_softc {
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struct resource *reg;
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int reg_rid;
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};
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static device_probe_t pl031_probe;
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static device_attach_t pl031_attach;
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static device_detach_t pl031_detach;
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static clock_gettime_t pl031_gettime;
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static clock_settime_t pl031_settime;
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static int
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pl031_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_is_compatible(dev, "arm,pl031"))
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return (ENXIO);
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device_set_desc(dev, "PL031 RTC");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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pl031_attach(device_t dev)
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{
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struct pl031_softc *sc;
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sc = device_get_softc(dev);
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sc->reg_rid = 0;
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sc->reg = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->reg_rid,
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RF_ACTIVE);
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if (sc->reg == 0)
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return (ENXIO);
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clock_register(dev, 1000000);
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return (0);
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}
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static int
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pl031_detach(device_t dev)
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{
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struct pl031_softc *sc;
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sc = device_get_softc(dev);
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clock_unregister(dev);
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bus_release_resource(dev, SYS_RES_MEMORY, sc->reg_rid, sc->reg);
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return (0);
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}
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static int
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pl031_gettime(device_t dev, struct timespec *ts)
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{
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struct pl031_softc *sc;
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sc = device_get_softc(dev);
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ts->tv_sec = bus_read_4(sc->reg, RTCDR);
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ts->tv_nsec = 0;
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return (0);
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}
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static int
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pl031_settime(device_t dev, struct timespec *ts)
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{
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struct pl031_softc *sc;
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sc = device_get_softc(dev);
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bus_write_4(sc->reg, RTCLR, ts->tv_sec);
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return (0);
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}
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static device_method_t pl031_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, pl031_probe),
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DEVMETHOD(device_attach, pl031_attach),
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DEVMETHOD(device_detach, pl031_detach),
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/* Clock interface */
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DEVMETHOD(clock_gettime, pl031_gettime),
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DEVMETHOD(clock_settime, pl031_settime),
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/* End */
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DEVMETHOD_END
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};
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DEFINE_CLASS_0(pl031, pl031_driver, pl031_methods,
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sizeof(struct pl031_softc));
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DRIVER_MODULE(pl031, simplebus, pl031_driver, 0, 0);
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@ -8,6 +8,9 @@ device pci_n1sdp # ARM Neoverse N1 SDP PCI
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# GPIO / PINCTRL
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device pl061 # Arm PL061 GPIO controller
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# RTC
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device pl031 # Arm PL031 RTC
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# Serial (COM) ports
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device pl011
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@ -64,6 +64,7 @@ arm64/arm64/minidump_machdep.c standard
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arm64/arm64/mp_machdep.c optional smp
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arm64/arm64/nexus.c standard
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arm64/arm64/ofw_machdep.c optional fdt
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arm64/arm64/pl031_rtc.c optional fdt pl031
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arm64/arm64/ptrauth.c standard \
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compile-with "${NORMAL_C:N-mbranch-protection*}"
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arm64/arm64/pmap.c standard
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