1 /* $NetBSD: bcm2835_mbox_fdt.c,v 1.3 2021/01/29 14:11:14 skrll 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_fdt.c,v 1.3 2021/01/29 14:11:14 skrll 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 #include <sys/mutex.h>
42
43 #include <arm/broadcom/bcm2835_mbox.h>
44 #include <arm/broadcom/bcm2835_mboxreg.h>
45 #include <arm/broadcom/bcm2835reg.h>
46 #include <arm/broadcom/bcm2835var.h>
47
48 #include <dev/fdt/fdtvar.h>
49
50 static int bcmmbox_fdt_match(device_t, cfdata_t, void *);
51 static void bcmmbox_fdt_attach(device_t, device_t, void *);
52
53 CFATTACH_DECL_NEW(bcmmbox_fdt, sizeof(struct bcm2835mbox_softc),
54 bcmmbox_fdt_match, bcmmbox_fdt_attach, NULL, NULL);
55
56 static const struct device_compatible_entry compat_data[] = {
57 { .compat = "brcm,bcm2835-mbox" },
58 DEVICE_COMPAT_EOL
59 };
60
61 /* ARGSUSED */
62 static int
bcmmbox_fdt_match(device_t parent,cfdata_t match,void * aux)63 bcmmbox_fdt_match(device_t parent, cfdata_t match, void *aux)
64 {
65 struct fdt_attach_args * const faa = aux;
66
67 return of_compatible_match(faa->faa_phandle, compat_data);
68 }
69
70 static void
bcmmbox_fdt_attach(device_t parent,device_t self,void * aux)71 bcmmbox_fdt_attach(device_t parent, device_t self, void *aux)
72 {
73 struct bcm2835mbox_softc *sc = device_private(self);
74 struct fdt_attach_args * const faa = aux;
75 const int phandle = faa->faa_phandle;
76 char intrstr[128];
77 bus_addr_t addr;
78 bus_size_t size;
79
80 sc->sc_dev = self;
81 sc->sc_iot = faa->faa_bst;
82 sc->sc_dmat = faa->faa_dmat;
83
84 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
85 aprint_error(": couldn't get register address\n");
86 return;
87 }
88
89 if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_ioh) != 0) {
90 aprint_error_dev(sc->sc_dev, "unable to map device\n");
91 return;
92 }
93
94 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
95 aprint_error(": failed to decode interrupt\n");
96 return;
97 }
98
99 aprint_naive("\n");
100 aprint_normal(": VC mailbox\n");
101
102 sc->sc_intrh = fdtbus_intr_establish_xname(phandle, 0, IPL_VM, 0,
103 bcmmbox_intr, sc, device_xname(self));
104 if (sc->sc_intrh == NULL) {
105 aprint_error_dev(self, "failed to establish interrupt %s\n",
106 intrstr);
107 return;
108 }
109 aprint_normal_dev(self, "interrupting on %s\n", intrstr);
110
111 bcmmbox_attach(sc);
112 }
113