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/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/rman.h> 39 40 #include <machine/bus.h> 41 42 #include <dev/fdt/simplebus.h> 43 #include <dev/fdt/fdt_common.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include "dwgpio_if.h" 47 48 struct dwgpiobus_softc { 49 struct simplebus_softc simplebus_sc; 50 device_t dev; 51 struct resource *res[1]; 52 }; 53 54 static struct resource_spec dwgpio_spec[] = { 55 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 56 { -1, 0 } 57 }; 58 59 static int 60 dwgpiobus_probe(device_t dev) 61 { 62 63 if (!ofw_bus_is_compatible(dev, "snps,dw-apb-gpio")) 64 return (ENXIO); 65 66 if (!ofw_bus_status_okay(dev)) 67 return (ENXIO); 68 69 device_set_desc(dev, "Synopsys® DesignWare® APB GPIO BUS"); 70 71 return (BUS_PROBE_DEFAULT); 72 } 73 74 static int 75 dwgpiobus_attach(device_t dev) 76 { 77 struct dwgpiobus_softc *sc; 78 phandle_t node; 79 80 sc = device_get_softc(dev); 81 sc->dev = dev; 82 83 node = ofw_bus_get_node(dev); 84 if (node == -1) 85 return (ENXIO); 86 87 if (bus_alloc_resources(dev, dwgpio_spec, sc->res)) { 88 device_printf(dev, "Could not allocate resources.\n"); 89 return (ENXIO); 90 } 91 92 simplebus_init(dev, node); 93 94 /* 95 * Allow devices to identify. 96 */ 97 bus_identify_children(dev); 98 99 /* 100 * Now walk the OFW tree and attach top-level devices. 101 */ 102 for (node = OF_child(node); node > 0; node = OF_peer(node)) 103 simplebus_add_device(dev, node, 0, NULL, -1, NULL); 104 105 bus_attach_children(dev); 106 return (0); 107 } 108 109 static int 110 dwgpiobus_detach(device_t dev) 111 { 112 struct dwgpiobus_softc *sc; 113 114 sc = device_get_softc(dev); 115 116 bus_release_resources(dev, dwgpio_spec, sc->res); 117 118 return (0); 119 } 120 121 static int 122 dwgpiobus_write(device_t dev, bus_size_t offset, int val) 123 { 124 struct dwgpiobus_softc *sc; 125 126 sc = device_get_softc(dev); 127 128 bus_write_4(sc->res[0], offset, val); 129 130 return (0); 131 }; 132 133 static int 134 dwgpiobus_read(device_t dev, bus_size_t offset) 135 { 136 struct dwgpiobus_softc *sc; 137 int val; 138 139 sc = device_get_softc(dev); 140 141 val = bus_read_4(sc->res[0], offset); 142 143 return (val); 144 }; 145 146 static device_method_t dwgpiobus_methods[] = { 147 DEVMETHOD(device_probe, dwgpiobus_probe), 148 DEVMETHOD(device_attach, dwgpiobus_attach), 149 DEVMETHOD(device_detach, dwgpiobus_detach), 150 151 DEVMETHOD(dwgpio_write, dwgpiobus_write), 152 DEVMETHOD(dwgpio_read, dwgpiobus_read), 153 154 DEVMETHOD_END 155 }; 156 157 DEFINE_CLASS_1(dwgpiobus, dwgpiobus_driver, dwgpiobus_methods, 158 sizeof(struct dwgpiobus_softc), simplebus_driver); 159 160 EARLY_DRIVER_MODULE(dwgpiobus, simplebus, dwgpiobus_driver, 0, 0, 161 BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE); 162 MODULE_VERSION(dwgpiobus, 1); 163