1fc1a22868
A PL061 is a simple 8 pin GPIO controller. This GPIO device is used to signal an internal request for shutdown on some virtual machines including Arm-based Amazon EC2 instances. Submitted by: Ali Saidi <alisaidi_amazon.com> (previouss version) Reviewed by: Ali Saidi, manu Differential Revision: https://reviews.freebsd.org/D24065
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 Andrew Turner
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*
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* This work was supported by Innovate UK project 105694, "Digital Security
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* by Design (DSbD) Technology Platform Prototype".
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/mutex.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 <dev/gpio/gpiobusvar.h>
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#include "pl061.h"
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static int
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pl061_fdt_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,pl061"))
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return (ENXIO);
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device_set_desc(dev, "Arm PL061 GPIO Controller");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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pl061_fdt_attach(device_t dev)
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{
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int error;
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error = pl061_attach(dev);
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if (error != 0)
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return (error);
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if (!intr_pic_register(dev, OF_xref_from_node(ofw_bus_get_node(dev)))) {
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device_printf(dev, "couldn't register PIC\n");
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pl061_detach(dev);
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error = ENXIO;
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}
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return (error);
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}
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static device_method_t pl061_fdt_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, pl061_fdt_probe),
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DEVMETHOD(device_attach, pl061_fdt_attach),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(gpio, pl061_fdt_driver, pl061_fdt_methods,
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sizeof(struct pl061_softc), pl061_driver);
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static devclass_t pl061_devclass;
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EARLY_DRIVER_MODULE(pl061, ofwbus, pl061_fdt_driver, pl061_devclass, NULL, NULL,
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BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
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MODULE_DEPEND(pl061, gpiobus, 1, 1, 1);
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