1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com> 5 * 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. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 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. 19 * 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 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/rman.h> 42 43 #include <machine/bus.h> 44 45 #include <dev/fdt/simplebus.h> 46 #include <dev/fdt/fdt_common.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include "dwgpio_if.h" 50 51 struct dwgpiobus_softc { 52 struct simplebus_softc simplebus_sc; 53 device_t dev; 54 struct resource *res[1]; 55 }; 56 57 static struct resource_spec dwgpio_spec[] = { 58 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 59 { -1, 0 } 60 }; 61 62 static int 63 dwgpiobus_probe(device_t dev) 64 { 65 66 if (!ofw_bus_is_compatible(dev, "snps,dw-apb-gpio")) 67 return (ENXIO); 68 69 if (!ofw_bus_status_okay(dev)) 70 return (ENXIO); 71 72 device_set_desc(dev, "Synopsys® DesignWare® APB GPIO BUS"); 73 74 return (BUS_PROBE_DEFAULT); 75 } 76 77 static int 78 dwgpiobus_attach(device_t dev) 79 { 80 struct dwgpiobus_softc *sc; 81 phandle_t node; 82 83 sc = device_get_softc(dev); 84 sc->dev = dev; 85 86 node = ofw_bus_get_node(dev); 87 if (node == -1) 88 return (ENXIO); 89 90 if (bus_alloc_resources(dev, dwgpio_spec, sc->res)) { 91 device_printf(dev, "Could not allocate resources.\n"); 92 return (ENXIO); 93 } 94 95 simplebus_init(dev, node); 96 97 /* 98 * Allow devices to identify. 99 */ 100 bus_generic_probe(dev); 101 102 /* 103 * Now walk the OFW tree and attach top-level devices. 104 */ 105 for (node = OF_child(node); node > 0; node = OF_peer(node)) 106 simplebus_add_device(dev, node, 0, NULL, -1, NULL); 107 108 return (bus_generic_attach(dev)); 109 } 110 111 static int 112 dwgpiobus_detach(device_t dev) 113 { 114 struct dwgpiobus_softc *sc; 115 116 sc = device_get_softc(dev); 117 118 bus_release_resources(dev, dwgpio_spec, sc->res); 119 120 return (0); 121 } 122 123 static int 124 dwgpiobus_write(device_t dev, bus_size_t offset, int val) 125 { 126 struct dwgpiobus_softc *sc; 127 128 sc = device_get_softc(dev); 129 130 bus_write_4(sc->res[0], offset, val); 131 132 return (0); 133 }; 134 135 static int 136 dwgpiobus_read(device_t dev, bus_size_t offset) 137 { 138 struct dwgpiobus_softc *sc; 139 int val; 140 141 sc = device_get_softc(dev); 142 143 val = bus_read_4(sc->res[0], offset); 144 145 return (val); 146 }; 147 148 static device_method_t dwgpiobus_methods[] = { 149 DEVMETHOD(device_probe, dwgpiobus_probe), 150 DEVMETHOD(device_attach, dwgpiobus_attach), 151 DEVMETHOD(device_detach, dwgpiobus_detach), 152 153 DEVMETHOD(dwgpio_write, dwgpiobus_write), 154 DEVMETHOD(dwgpio_read, dwgpiobus_read), 155 156 DEVMETHOD_END 157 }; 158 159 DEFINE_CLASS_1(dwgpiobus, dwgpiobus_driver, dwgpiobus_methods, 160 sizeof(struct dwgpiobus_softc), simplebus_driver); 161 162 static devclass_t dwgpiobus_devclass; 163 164 EARLY_DRIVER_MODULE(dwgpiobus, simplebus, dwgpiobus_driver, dwgpiobus_devclass, 165 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE); 166 MODULE_VERSION(dwgpiobus, 1); 167