2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com>
6 * This software was developed by SRI International and the University of
7 * Cambridge Computer Laboratory (Department of Computer Science and
8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
9 * DARPA SSITH research programme.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
43 #include <machine/bus.h>
45 #include <dev/fdt/simplebus.h>
46 #include <dev/fdt/fdt_common.h>
47 #include <dev/ofw/ofw_bus_subr.h>
49 #include "dwgpio_if.h"
51 struct dwgpiobus_softc {
52 struct simplebus_softc simplebus_sc;
54 struct resource *res[1];
57 static struct resource_spec dwgpio_spec[] = {
58 { SYS_RES_MEMORY, 0, RF_ACTIVE },
63 dwgpiobus_probe(device_t dev)
66 if (!ofw_bus_is_compatible(dev, "snps,dw-apb-gpio"))
69 if (!ofw_bus_status_okay(dev))
72 device_set_desc(dev, "Synopsys® DesignWare® APB GPIO BUS");
74 return (BUS_PROBE_DEFAULT);
78 dwgpiobus_attach(device_t dev)
80 struct dwgpiobus_softc *sc;
83 sc = device_get_softc(dev);
86 node = ofw_bus_get_node(dev);
90 if (bus_alloc_resources(dev, dwgpio_spec, sc->res)) {
91 device_printf(dev, "Could not allocate resources.\n");
95 simplebus_init(dev, node);
98 * Allow devices to identify.
100 bus_generic_probe(dev);
103 * Now walk the OFW tree and attach top-level devices.
105 for (node = OF_child(node); node > 0; node = OF_peer(node))
106 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
108 return (bus_generic_attach(dev));
112 dwgpiobus_detach(device_t dev)
114 struct dwgpiobus_softc *sc;
116 sc = device_get_softc(dev);
118 bus_release_resources(dev, dwgpio_spec, sc->res);
124 dwgpiobus_write(device_t dev, bus_size_t offset, int val)
126 struct dwgpiobus_softc *sc;
128 sc = device_get_softc(dev);
130 bus_write_4(sc->res[0], offset, val);
136 dwgpiobus_read(device_t dev, bus_size_t offset)
138 struct dwgpiobus_softc *sc;
141 sc = device_get_softc(dev);
143 val = bus_read_4(sc->res[0], offset);
148 static device_method_t dwgpiobus_methods[] = {
149 DEVMETHOD(device_probe, dwgpiobus_probe),
150 DEVMETHOD(device_attach, dwgpiobus_attach),
151 DEVMETHOD(device_detach, dwgpiobus_detach),
153 DEVMETHOD(dwgpio_write, dwgpiobus_write),
154 DEVMETHOD(dwgpio_read, dwgpiobus_read),
159 DEFINE_CLASS_1(dwgpiobus, dwgpiobus_driver, dwgpiobus_methods,
160 sizeof(struct dwgpiobus_softc), simplebus_driver);
162 static devclass_t dwgpiobus_devclass;
164 EARLY_DRIVER_MODULE(dwgpiobus, simplebus, dwgpiobus_driver, dwgpiobus_devclass,
165 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
166 MODULE_VERSION(dwgpiobus, 1);