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
42 static int cpus_match(device_t, cfdata_t, void *);
43 static void cpus_attach(device_t, device_t, void *);
44
45 static bool cpus_cpu_enabled(int);
46
47 CFATTACH_DECL_NEW(cpus, 0, cpus_match, cpus_attach, NULL, NULL);
48
49 static int
cpus_match(device_t parent,cfdata_t cf,void * aux)50 cpus_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
57 static void
cpus_attach(device_t parent,device_t self,void * aux)58 cpus_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
76 static bool
cpus_cpu_enabled(int child)77 cpus_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