terasic_de4led_fdt.c revision 266152
1/*- 2 * Copyright (c) 2012 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/10/sys/dev/terasic/de4led/terasic_de4led_fdt.c 266152 2014-05-15 16:11:06Z ian $"); 33 34#include <sys/param.h> 35#include <sys/bus.h> 36#include <sys/condvar.h> 37#include <sys/conf.h> 38#include <sys/bio.h> 39#include <sys/kernel.h> 40#include <sys/lock.h> 41#include <sys/malloc.h> 42#include <sys/module.h> 43#include <sys/mutex.h> 44#include <sys/rman.h> 45#include <sys/systm.h> 46 47#include <machine/bus.h> 48#include <machine/resource.h> 49 50#include <dev/fdt/fdt_common.h> 51#include <dev/ofw/openfirm.h> 52#include <dev/ofw/ofw_bus.h> 53#include <dev/ofw/ofw_bus_subr.h> 54 55#include <dev/terasic/de4led/terasic_de4led.h> 56 57/* 58 * Nexus bus attachment for the 8-element LED on the Terasic DE-4 FPGA board, 59 * which is hooked up to the processor via a memory-mapped Avalon bus. 60 */ 61static int 62terasic_de4led_fdt_probe(device_t dev) 63{ 64 65 if (!ofw_bus_status_okay(dev)) 66 return (ENXIO); 67 68 if (ofw_bus_is_compatible(dev, "sri-cambridge,de4led")) { 69 device_set_desc(dev, "Terasic DE4 8-element LED"); 70 return (BUS_PROBE_DEFAULT); 71 } 72 return (ENXIO); 73} 74 75static int 76terasic_de4led_fdt_attach(device_t dev) 77{ 78 struct terasic_de4led_softc *sc; 79 80 sc = device_get_softc(dev); 81 sc->tdl_dev = dev; 82 sc->tdl_unit = device_get_unit(dev); 83 sc->tdl_rid = 0; 84 sc->tdl_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 85 &sc->tdl_rid, RF_ACTIVE); 86 if (sc->tdl_res == NULL) { 87 device_printf(dev, "couldn't map memory\n"); 88 return (ENXIO); 89 } 90 terasic_de4led_attach(sc); 91 return (0); 92} 93 94static int 95terasic_de4led_fdt_detach(device_t dev) 96{ 97 struct terasic_de4led_softc *sc; 98 99 sc = device_get_softc(dev); 100 KASSERT(sc->tdl_res != NULL, ("%s: resources not allocated", 101 __func__)); 102 terasic_de4led_detach(sc); 103 bus_release_resource(dev, SYS_RES_MEMORY, sc->tdl_rid, sc->tdl_res); 104 return (0); 105} 106 107static device_method_t terasic_de4led_fdt_methods[] = { 108 DEVMETHOD(device_probe, terasic_de4led_fdt_probe), 109 DEVMETHOD(device_attach, terasic_de4led_fdt_attach), 110 DEVMETHOD(device_detach, terasic_de4led_fdt_detach), 111 { 0, 0 } 112}; 113 114static driver_t terasic_de4led_fdt_driver = { 115 "terasic_de4led", 116 terasic_de4led_fdt_methods, 117 sizeof(struct terasic_de4led_softc), 118}; 119 120DRIVER_MODULE(terasic_de4led, simplebus, terasic_de4led_fdt_driver, 121 terasic_de4led_devclass, 0, 0); 122