Date: Tue, 15 Aug 2023 12:14:29 GMT From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 9d09051e261c - main - arm64: Add a driver for the Arm PL031 RTC Message-ID: <202308151214.37FCETdX093751@gitrepo.freebsd.org>
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The branch main has been updated by andrew: URL: https://cgit.FreeBSD.org/src/commit/?id=9d09051e261c7020e5aa933c6aa1c2d84ebd0457 commit 9d09051e261c7020e5aa933c6aa1c2d84ebd0457 Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2023-08-01 15:21:21 +0000 Commit: Andrew Turner <andrew@FreeBSD.org> CommitDate: 2023-08-15 12:13:39 +0000 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 --- sys/arm64/arm64/pl031_rtc.c | 153 ++++++++++++++++++++++++++++++++++++++++++++ sys/arm64/conf/std.arm | 3 + sys/conf/files.arm64 | 1 + 3 files changed, 157 insertions(+) diff --git a/sys/arm64/arm64/pl031_rtc.c b/sys/arm64/arm64/pl031_rtc.c new file mode 100644 index 000000000000..5663b264af00 --- /dev/null +++ b/sys/arm64/arm64/pl031_rtc.c @@ -0,0 +1,153 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2023 Arm Ltd + * + * 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. + */ + +/* + * Driver for the Arm PL031 RTC device + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/clock.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/rman.h> + +#include <machine/bus.h> +#include <machine/resource.h> + +#include <dev/ofw/openfirm.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include "clock_if.h" + +#define RTCDR 0x00 +#define RTCMR 0x04 +#define RTCLR 0x08 +#define RTCCR 0x0c +#define RTCIMSR 0x10 +#define RTCRIS 0x14 +#define RTCMIS 0x18 +#define RTCICR 0x1c + +struct pl031_softc { + struct resource *reg; + int reg_rid; +}; + +static device_probe_t pl031_probe; +static device_attach_t pl031_attach; +static device_detach_t pl031_detach; + +static clock_gettime_t pl031_gettime; +static clock_settime_t pl031_settime; + +static int +pl031_probe(device_t dev) +{ + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "arm,pl031")) + return (ENXIO); + + device_set_desc(dev, "PL031 RTC"); + return (BUS_PROBE_DEFAULT); +} + +static int +pl031_attach(device_t dev) +{ + struct pl031_softc *sc; + + sc = device_get_softc(dev); + + sc->reg_rid = 0; + sc->reg = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->reg_rid, + RF_ACTIVE); + if (sc->reg == 0) + return (ENXIO); + + clock_register(dev, 1000000); + + return (0); +} + +static int +pl031_detach(device_t dev) +{ + struct pl031_softc *sc; + + sc = device_get_softc(dev); + + clock_unregister(dev); + bus_release_resource(dev, SYS_RES_MEMORY, sc->reg_rid, sc->reg); + + return (0); +} + +static int +pl031_gettime(device_t dev, struct timespec *ts) +{ + struct pl031_softc *sc; + + sc = device_get_softc(dev); + ts->tv_sec = bus_read_4(sc->reg, RTCDR); + ts->tv_nsec = 0; + + return (0); +} + +static int +pl031_settime(device_t dev, struct timespec *ts) +{ + struct pl031_softc *sc; + + sc = device_get_softc(dev); + bus_write_4(sc->reg, RTCLR, ts->tv_sec); + return (0); +} + +static device_method_t pl031_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, pl031_probe), + DEVMETHOD(device_attach, pl031_attach), + DEVMETHOD(device_detach, pl031_detach), + + /* Clock interface */ + DEVMETHOD(clock_gettime, pl031_gettime), + DEVMETHOD(clock_settime, pl031_settime), + + /* End */ + DEVMETHOD_END +}; + +DEFINE_CLASS_0(pl031, pl031_driver, pl031_methods, + sizeof(struct pl031_softc)); + +DRIVER_MODULE(pl031, simplebus, pl031_driver, 0, 0); diff --git a/sys/arm64/conf/std.arm b/sys/arm64/conf/std.arm index 2b40fd7b0eb8..fb5561506531 100644 --- a/sys/arm64/conf/std.arm +++ b/sys/arm64/conf/std.arm @@ -8,6 +8,9 @@ device pci_n1sdp # ARM Neoverse N1 SDP PCI # GPIO / PINCTRL device pl061 # Arm PL061 GPIO controller +# RTC +device pl031 # Arm PL031 RTC + # Serial (COM) ports device pl011 diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64 index 29d805dd64b7..0d3c43af0c00 100644 --- a/sys/conf/files.arm64 +++ b/sys/conf/files.arm64 @@ -64,6 +64,7 @@ arm64/arm64/minidump_machdep.c standard arm64/arm64/mp_machdep.c optional smp arm64/arm64/nexus.c standard arm64/arm64/ofw_machdep.c optional fdt +arm64/arm64/pl031_rtc.c optional fdt pl031 arm64/arm64/ptrauth.c standard \ compile-with "${NORMAL_C:N-mbranch-protection*}" arm64/arm64/pmap.c standard
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