bcm2835_mbox.c revision 1.2 
1/*	$NetBSD: bcm2835_mbox.c,v 1.2 2012/08/22 13:19:47 jakllsch Exp $	*/
2
3/*-
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Nick Hudson
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: bcm2835_mbox.c,v 1.2 2012/08/22 13:19:47 jakllsch Exp $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/device.h>
38#include <sys/kernel.h>
39#include <sys/timetc.h>
40#include <sys/bus.h>
41
42#include <arm/broadcom/bcm_amba.h>
43#include <arm/broadcom/bcm2835_mbox.h>
44#include <arm/broadcom/bcm2835_mboxreg.h>
45#include <arm/broadcom/bcm2835reg.h>
46
47struct bcm2835mbox_softc {
48	device_t sc_dev;
49
50	bus_space_tag_t sc_iot;
51	bus_space_handle_t sc_ioh;
52};
53
54static struct bcm2835mbox_softc *bcm2835mbox_sc;
55
56static int bcmmbox_match(device_t, cfdata_t, void *);
57static void bcmmbox_attach(device_t, device_t, void *);
58
59CFATTACH_DECL_NEW(bcmmbox, sizeof(struct bcm2835mbox_softc),
60    bcmmbox_match, bcmmbox_attach, NULL, NULL);
61
62/* ARGSUSED */
63static int
64bcmmbox_match(device_t parent, cfdata_t match, void *aux)
65{
66	struct amba_attach_args *aaa = aux;
67
68	if (strcmp(aaa->aaa_name, "bcmmbox") != 0)
69		return 0;
70
71	return 1;
72}
73
74static void
75bcmmbox_attach(device_t parent, device_t self, void *aux)
76{
77        struct bcm2835mbox_softc *sc = device_private(self);
78 	struct amba_attach_args *aaa = aux;
79
80	aprint_naive("\n");
81	aprint_normal(": VC mailbox\n");
82
83	if (bcm2835mbox_sc == NULL)
84		bcm2835mbox_sc = sc;
85
86	sc->sc_dev = self;
87	sc->sc_iot = aaa->aaa_iot;
88
89	if (bus_space_map(aaa->aaa_iot, aaa->aaa_addr, BCM2835_MBOX_SIZE, 0,
90	    &sc->sc_ioh)) {
91		aprint_error_dev(sc->sc_dev, "unable to map device\n");
92		return;
93	}
94}
95
96void
97bcmmbox_read(uint8_t chan, uint32_t *data)
98{
99	struct bcm2835mbox_softc *sc = bcm2835mbox_sc;
100
101	KASSERT(sc != NULL);
102
103	return bcm2835_mbox_read(sc->sc_iot, sc->sc_ioh, chan, data);
104}
105
106void
107bcmmbox_write(uint8_t chan, uint32_t data)
108{
109	struct bcm2835mbox_softc *sc = bcm2835mbox_sc;
110
111	KASSERT(sc != NULL);
112
113	return bcm2835_mbox_write(sc->sc_iot, sc->sc_ioh, chan, data);
114}
115