1 /* $NetBSD: fdt_platform.c,v 1.1 2023/04/07 08:55:31 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared D. 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: fdt_platform.c,v 1.1 2023/04/07 08:55:31 skrll Exp $");
31
32 #include <sys/param.h>
33
34 #include <dev/ofw/openfirm.h>
35
36 #include <dev/fdt/fdtvar.h>
37
38 const struct fdt_platform *
fdt_platform_find(void)39 fdt_platform_find(void)
40 {
41 static const struct fdt_platform_info *booted_platform = NULL;
42 __link_set_decl(fdt_platforms, struct fdt_platform_info);
43 struct fdt_platform_info * const *info;
44
45 if (booted_platform == NULL) {
46 const struct fdt_platform_info *best_info = NULL;
47 const int phandle = OF_peer(0);
48 int match, best_match = 0;
49
50 __link_set_foreach(info, fdt_platforms) {
51 const struct device_compatible_entry compat_data[] = {
52 { .compat = (*info)->fpi_compat },
53 DEVICE_COMPAT_EOL
54 };
55
56 match = of_compatible_match(phandle, compat_data);
57 if (match > best_match) {
58 best_match = match;
59 best_info = *info;
60 }
61 }
62
63 booted_platform = best_info;
64 }
65
66 /*
67 * No SoC specific platform was found. Try to find a generic
68 * platform definition and use that if available.
69 */
70 if (booted_platform == NULL) {
71 __link_set_foreach(info, fdt_platforms) {
72 if (strcmp((*info)->fpi_compat, FDT_PLATFORM_DEFAULT) == 0) {
73 booted_platform = *info;
74 break;
75 }
76 }
77 }
78
79 return booted_platform == NULL ? NULL : booted_platform->fpi_ops;
80 }
81
82 // XXXNH remove this and rely on a default
83 FDT_PLATFORM(dummy, NULL, NULL);
84