terasic_de4led_fdt.c revision 245380 
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: head/sys/dev/terasic/de4led/terasic_de4led_fdt.c 245380 2013-01-13 16:57:11Z rwatson $");
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_is_compatible(dev, "sri-cambridge,de4led")) {
66		device_set_desc(dev, "Terasic DE4 8-element LED");
67		return (BUS_PROBE_DEFAULT);
68	}
69	return (ENXIO);
70}
71
72static int
73terasic_de4led_fdt_attach(device_t dev)
74{
75	struct terasic_de4led_softc *sc;
76
77	sc = device_get_softc(dev);
78	sc->tdl_dev = dev;
79	sc->tdl_unit = device_get_unit(dev);
80	sc->tdl_rid = 0;
81	sc->tdl_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
82	    &sc->tdl_rid, RF_ACTIVE);
83	if (sc->tdl_res == NULL) {
84		device_printf(dev, "couldn't map memory\n");
85		return (ENXIO);
86	}
87	terasic_de4led_attach(sc);
88	return (0);
89}
90
91static int
92terasic_de4led_fdt_detach(device_t dev)
93{
94	struct terasic_de4led_softc *sc;
95
96	sc = device_get_softc(dev);
97	KASSERT(sc->tdl_res != NULL, ("%s: resources not allocated",
98	    __func__));
99	terasic_de4led_detach(sc);
100	bus_release_resource(dev, SYS_RES_MEMORY, sc->tdl_rid, sc->tdl_res);
101	return (0);
102}
103
104static device_method_t terasic_de4led_fdt_methods[] = {
105	DEVMETHOD(device_probe,		terasic_de4led_fdt_probe),
106	DEVMETHOD(device_attach,	terasic_de4led_fdt_attach),
107	DEVMETHOD(device_detach,	terasic_de4led_fdt_detach),
108	{ 0, 0 }
109};
110
111static driver_t terasic_de4led_fdt_driver = {
112	"terasic_de4led",
113	terasic_de4led_fdt_methods,
114	sizeof(struct terasic_de4led_softc),
115};
116
117DRIVER_MODULE(terasic_de4led, simplebus, terasic_de4led_fdt_driver,
118    terasic_de4led_devclass, 0, 0);
119