167 lines
4.2 KiB
C
167 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com>
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory (Department of Computer Science and
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* Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
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* DARPA SSITH research programme.
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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/rman.h>
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#include <machine/bus.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "dwgpio_if.h"
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struct dwgpiobus_softc {
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struct simplebus_softc simplebus_sc;
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device_t dev;
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struct resource *res[1];
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};
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static struct resource_spec dwgpio_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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static int
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dwgpiobus_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "snps,dw-apb-gpio"))
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return (ENXIO);
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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device_set_desc(dev, "Synopsys® DesignWare® APB GPIO BUS");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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dwgpiobus_attach(device_t dev)
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{
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struct dwgpiobus_softc *sc;
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phandle_t node;
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sc = device_get_softc(dev);
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sc->dev = dev;
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node = ofw_bus_get_node(dev);
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if (node == -1)
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return (ENXIO);
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if (bus_alloc_resources(dev, dwgpio_spec, sc->res)) {
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device_printf(dev, "Could not allocate resources.\n");
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return (ENXIO);
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}
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simplebus_init(dev, node);
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/*
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* Allow devices to identify.
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*/
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bus_generic_probe(dev);
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/*
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* Now walk the OFW tree and attach top-level devices.
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*/
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for (node = OF_child(node); node > 0; node = OF_peer(node))
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simplebus_add_device(dev, node, 0, NULL, -1, NULL);
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return (bus_generic_attach(dev));
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}
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static int
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dwgpiobus_detach(device_t dev)
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{
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struct dwgpiobus_softc *sc;
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sc = device_get_softc(dev);
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bus_release_resources(dev, dwgpio_spec, sc->res);
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return (0);
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}
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static int
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dwgpiobus_write(device_t dev, bus_size_t offset, int val)
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{
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struct dwgpiobus_softc *sc;
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sc = device_get_softc(dev);
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bus_write_4(sc->res[0], offset, val);
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return (0);
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};
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static int
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dwgpiobus_read(device_t dev, bus_size_t offset)
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{
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struct dwgpiobus_softc *sc;
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int val;
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sc = device_get_softc(dev);
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val = bus_read_4(sc->res[0], offset);
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return (val);
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};
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static device_method_t dwgpiobus_methods[] = {
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DEVMETHOD(device_probe, dwgpiobus_probe),
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DEVMETHOD(device_attach, dwgpiobus_attach),
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DEVMETHOD(device_detach, dwgpiobus_detach),
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DEVMETHOD(dwgpio_write, dwgpiobus_write),
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DEVMETHOD(dwgpio_read, dwgpiobus_read),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(dwgpiobus, dwgpiobus_driver, dwgpiobus_methods,
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sizeof(struct dwgpiobus_softc), simplebus_driver);
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static devclass_t dwgpiobus_devclass;
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EARLY_DRIVER_MODULE(dwgpiobus, simplebus, dwgpiobus_driver, dwgpiobus_devclass,
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0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(dwgpiobus, 1);
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