1 /* $NetBSD: cpus_fdt.c,v 1.1 2023/06/12 12:58:17 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2023 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: cpus_fdt.c,v 1.1 2023/06/12 12:58:17 skrll Exp $");
34
35 #include <sys/param.h>
36 #include <sys/types.h>
37
38 #include <dev/fdt/fdtvar.h>
39
40 #include <machine/machdep.h>
41
42 void
fdtbus_cpus_md_attach(device_t parent,device_t self,void * aux)43 fdtbus_cpus_md_attach(device_t parent, device_t self, void *aux)
44 {
45 struct fdt_attach_args * const faa = aux;
46 const int cpus = faa->faa_phandle;
47
48 uint32_t tbfreq;
49 int ret = of_getprop_uint32(cpus, "timebase-frequency", &tbfreq);
50 if (ret < 0) {
51 aprint_error(": can't get timebase frequency\n");
52 return;
53 }
54 riscv_timer_frequency_set(tbfreq);
55 }
56