1 /* $NetBSD: bcm2838_rng.c,v 1.2 2021/01/27 03:10:19 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2019 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jared D. McNeill
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: bcm2838_rng.c,v 1.2 2021/01/27 03:10:19 thorpej Exp $");
34
35 #include <sys/param.h>
36 #include <sys/device.h>
37
38 #include <dev/ic/rng200var.h>
39 #include <dev/fdt/fdtvar.h>
40
41 struct bcm2838rng_softc {
42 device_t sc_dev;
43 struct rng200_softc sc_rng200;
44 };
45
46 static int bcm2838rng_match(device_t, cfdata_t, void *);
47 static void bcm2838rng_attach(device_t, device_t, void *);
48
49 CFATTACH_DECL_NEW(bcm2838rng_fdt, sizeof(struct bcm2838rng_softc),
50 bcm2838rng_match, bcm2838rng_attach, NULL, NULL);
51
52 static const struct device_compatible_entry compat_data[] = {
53 { .compat = "brcm,bcm2838-rng200" },
54 DEVICE_COMPAT_EOL
55 };
56
57 /* ARGSUSED */
58 static int
bcm2838rng_match(device_t parent,cfdata_t match,void * aux)59 bcm2838rng_match(device_t parent, cfdata_t match, void *aux)
60 {
61 struct fdt_attach_args * const faa = aux;
62
63 return of_compatible_match(faa->faa_phandle, compat_data);
64 }
65
66 static void
bcm2838rng_attach(device_t parent,device_t self,void * aux)67 bcm2838rng_attach(device_t parent, device_t self, void *aux)
68 {
69 struct bcm2838rng_softc *sc = device_private(self);
70 struct fdt_attach_args * const faa = aux;
71 bus_addr_t addr;
72 bus_size_t size;
73 bus_space_handle_t bsh;
74 int error;
75
76 sc->sc_dev = self;
77
78 error = fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size);
79 if (error) {
80 aprint_error_dev(sc->sc_dev, ": couldn't get registers\n");
81 return;
82 }
83
84 if (bus_space_map(faa->faa_bst, addr, size, 0, &bsh)) {
85 aprint_error_dev(sc->sc_dev, ": unable to map device\n");
86 return;
87 }
88
89 aprint_naive("\n");
90 aprint_normal(": Hardware RNG\n");
91
92 sc->sc_rng200.sc_bst = faa->faa_bst;
93 sc->sc_rng200.sc_bsh = bsh;
94 sc->sc_rng200.sc_name = device_xname(sc->sc_dev);
95 rng200_attach(&sc->sc_rng200);
96 }
97