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