1/* $NetBSD: cpus.c,v 1.8 2023/06/12 12:58:17 skrll Exp $ */
2
3/*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: cpus.c,v 1.8 2023/06/12 12:58:17 skrll Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/intr.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/kmem.h>
39
40#include <dev/fdt/fdtvar.h>
41
42static int	cpus_match(device_t, cfdata_t, void *);
43static void	cpus_attach(device_t, device_t, void *);
44
45static bool	cpus_cpu_enabled(int);
46
47CFATTACH_DECL_NEW(cpus, 0, cpus_match, cpus_attach, NULL, NULL);
48
49static int
50cpus_match(device_t parent, cfdata_t cf, void *aux)
51{
52	struct fdt_attach_args * const faa = aux;
53
54	return OF_finddevice("/cpus") == faa->faa_phandle;
55}
56
57static void
58cpus_attach(device_t parent, device_t self, void *aux)
59{
60	struct fdt_attach_args * const faa = aux;
61	const int phandle = faa->faa_phandle;
62	int child;
63
64	aprint_naive("\n");
65	aprint_normal("\n");
66
67	fdtbus_cpus_md_attach(parent, self, faa);
68
69	for (child = OF_child(phandle); child; child = OF_peer(child)) {
70		if (!cpus_cpu_enabled(child))
71			continue;
72		fdt_add_child(self, child, faa, 0);
73	}
74}
75
76static bool
77cpus_cpu_enabled(int child)
78{
79	const char *s;
80
81	/* Only match nodes with device_type = "cpu" */
82	s = fdtbus_get_string(child, "device_type");
83	if (!s || strcmp(s, "cpu") != 0)
84		return false;
85
86	/* If status is set, it must be either "okay" or "disabled" */
87	s = fdtbus_get_string(child, "status");
88	if (s) {
89		if (strcmp(s, "okay") == 0)
90			return true;
91		if (strcmp(s, "disabled") == 0)
92			return of_hasprop(child, "enable-method");
93		return false;
94	} else {
95		return true;
96	}
97}
98