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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * This file does the necessary interface mapping between the bootwrapper
4 * device tree operations and the interface provided by shared source
5 * files flatdevicetree.[ch].
6 *
7 * Copyright 2007 David Gibson, IBM Corporation.
8 */
9
10#include <stddef.h>
11#include <stdio.h>
12#include <page.h>
13#include <libfdt.h>
14#include "ops.h"
15
16#define DEBUG 0
17#define BAD_ERROR(err) (((err) < 0) \
18 && ((err) != -FDT_ERR_NOTFOUND) \
19 && ((err) != -FDT_ERR_EXISTS))
20
21#define check_err(err) \
22 ({ \
23 if (BAD_ERROR(err) || ((err < 0) && DEBUG)) \
24 printf("%s():%d %s\n\r", __func__, __LINE__, \
25 fdt_strerror(err)); \
26 if (BAD_ERROR(err)) \
27 exit(); \
28 (err < 0) ? -1 : 0; \
29 })
30
31#define offset_devp(off) \
32 ({ \
33 unsigned long _offset = (off); \
34 check_err(_offset) ? NULL : (void *)(_offset+1); \
35 })
36
37#define devp_offset_find(devp) (((unsigned long)(devp))-1)
38#define devp_offset(devp) (devp ? ((unsigned long)(devp))-1 : 0)
39
40static void *fdt;
41static void *buf; /* = NULL */
42
43#define EXPAND_GRANULARITY 1024
44
45static void expand_buf(int minexpand)
46{
47 int size = fdt_totalsize(fdt);
48 int rc;
49
50 size = _ALIGN(size + minexpand, EXPAND_GRANULARITY);
51 buf = platform_ops.realloc(buf, size);
52 if (!buf)
53 fatal("Couldn't find %d bytes to expand device tree\n\r", size);
54 rc = fdt_open_into(fdt, buf, size);
55 if (rc != 0)
56 fatal("Couldn't expand fdt into new buffer: %s\n\r",
57 fdt_strerror(rc));
58
59 fdt = buf;
60}
61
62static void *fdt_wrapper_finddevice(const char *path)
63{
64 return offset_devp(fdt_path_offset(fdt, path));
65}
66
67static int fdt_wrapper_getprop(const void *devp, const char *name,
68 void *buf, const int buflen)
69{
70 const void *p;
71 int len;
72
73 p = fdt_getprop(fdt, devp_offset(devp), name, &len);
74 if (!p)
75 return check_err(len);
76 memcpy(buf, p, min(len, buflen));
77 return len;
78}
79
80static int fdt_wrapper_setprop(const void *devp, const char *name,
81 const void *buf, const int len)
82{
83 int rc;
84
85 rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
86 if (rc == -FDT_ERR_NOSPACE) {
87 expand_buf(len + 16);
88 rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
89 }
90
91 return check_err(rc);
92}
93
94static int fdt_wrapper_del_node(const void *devp)
95{
96 return fdt_del_node(fdt, devp_offset(devp));
97}
98
99static void *fdt_wrapper_get_parent(const void *devp)
100{
101 return offset_devp(fdt_parent_offset(fdt, devp_offset(devp)));
102}
103
104static void *fdt_wrapper_create_node(const void *devp, const char *name)
105{
106 int offset;
107
108 offset = fdt_add_subnode(fdt, devp_offset(devp), name);
109 if (offset == -FDT_ERR_NOSPACE) {
110 expand_buf(strlen(name) + 16);
111 offset = fdt_add_subnode(fdt, devp_offset(devp), name);
112 }
113
114 return offset_devp(offset);
115}
116
117static void *fdt_wrapper_find_node_by_prop_value(const void *prev,
118 const char *name,
119 const char *val,
120 int len)
121{
122 int offset = fdt_node_offset_by_prop_value(fdt, devp_offset_find(prev),
123 name, val, len);
124 return offset_devp(offset);
125}
126
127static void *fdt_wrapper_find_node_by_compatible(const void *prev,
128 const char *val)
129{
130 int offset = fdt_node_offset_by_compatible(fdt, devp_offset_find(prev),
131 val);
132 return offset_devp(offset);
133}
134
135static char *fdt_wrapper_get_path(const void *devp, char *buf, int len)
136{
137 int rc;
138
139 rc = fdt_get_path(fdt, devp_offset(devp), buf, len);
140 if (check_err(rc))
141 return NULL;
142 return buf;
143}
144
145static unsigned long fdt_wrapper_finalize(void)
146{
147 int rc;
148
149 rc = fdt_pack(fdt);
150 if (rc != 0)
151 fatal("Couldn't pack flat tree: %s\n\r",
152 fdt_strerror(rc));
153 return (unsigned long)fdt;
154}
155
156void fdt_init(void *blob)
157{
158 int err;
159 int bufsize;
160
161 dt_ops.finddevice = fdt_wrapper_finddevice;
162 dt_ops.getprop = fdt_wrapper_getprop;
163 dt_ops.setprop = fdt_wrapper_setprop;
164 dt_ops.get_parent = fdt_wrapper_get_parent;
165 dt_ops.create_node = fdt_wrapper_create_node;
166 dt_ops.find_node_by_prop_value = fdt_wrapper_find_node_by_prop_value;
167 dt_ops.find_node_by_compatible = fdt_wrapper_find_node_by_compatible;
168 dt_ops.del_node = fdt_wrapper_del_node;
169 dt_ops.get_path = fdt_wrapper_get_path;
170 dt_ops.finalize = fdt_wrapper_finalize;
171
172 /* Make sure the dt blob is the right version and so forth */
173 fdt = blob;
174 bufsize = fdt_totalsize(fdt) + EXPAND_GRANULARITY;
175 buf = malloc(bufsize);
176 if(!buf)
177 fatal("malloc failed. can't relocate the device tree\n\r");
178
179 err = fdt_open_into(fdt, buf, bufsize);
180
181 if (err != 0)
182 fatal("fdt_init(): %s\n\r", fdt_strerror(err));
183
184 fdt = buf;
185}
1/*
2 * This file does the necessary interface mapping between the bootwrapper
3 * device tree operations and the interface provided by shared source
4 * files flatdevicetree.[ch].
5 *
6 * Copyright 2007 David Gibson, IBM Corporation.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * 02110-1301 USA
22 */
23
24#include <stddef.h>
25#include <stdio.h>
26#include <page.h>
27#include <libfdt.h>
28#include "ops.h"
29
30#define DEBUG 0
31#define BAD_ERROR(err) (((err) < 0) \
32 && ((err) != -FDT_ERR_NOTFOUND) \
33 && ((err) != -FDT_ERR_EXISTS))
34
35#define check_err(err) \
36 ({ \
37 if (BAD_ERROR(err) || ((err < 0) && DEBUG)) \
38 printf("%s():%d %s\n\r", __func__, __LINE__, \
39 fdt_strerror(err)); \
40 if (BAD_ERROR(err)) \
41 exit(); \
42 (err < 0) ? -1 : 0; \
43 })
44
45#define offset_devp(off) \
46 ({ \
47 int _offset = (off); \
48 check_err(_offset) ? NULL : (void *)(_offset+1); \
49 })
50
51#define devp_offset_find(devp) (((int)(devp))-1)
52#define devp_offset(devp) (devp ? ((int)(devp))-1 : 0)
53
54static void *fdt;
55static void *buf; /* = NULL */
56
57#define EXPAND_GRANULARITY 1024
58
59static void expand_buf(int minexpand)
60{
61 int size = fdt_totalsize(fdt);
62 int rc;
63
64 size = _ALIGN(size + minexpand, EXPAND_GRANULARITY);
65 buf = platform_ops.realloc(buf, size);
66 if (!buf)
67 fatal("Couldn't find %d bytes to expand device tree\n\r", size);
68 rc = fdt_open_into(fdt, buf, size);
69 if (rc != 0)
70 fatal("Couldn't expand fdt into new buffer: %s\n\r",
71 fdt_strerror(rc));
72
73 fdt = buf;
74}
75
76static void *fdt_wrapper_finddevice(const char *path)
77{
78 return offset_devp(fdt_path_offset(fdt, path));
79}
80
81static int fdt_wrapper_getprop(const void *devp, const char *name,
82 void *buf, const int buflen)
83{
84 const void *p;
85 int len;
86
87 p = fdt_getprop(fdt, devp_offset(devp), name, &len);
88 if (!p)
89 return check_err(len);
90 memcpy(buf, p, min(len, buflen));
91 return len;
92}
93
94static int fdt_wrapper_setprop(const void *devp, const char *name,
95 const void *buf, const int len)
96{
97 int rc;
98
99 rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
100 if (rc == -FDT_ERR_NOSPACE) {
101 expand_buf(len + 16);
102 rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
103 }
104
105 return check_err(rc);
106}
107
108static int fdt_wrapper_del_node(const void *devp)
109{
110 return fdt_del_node(fdt, devp_offset(devp));
111}
112
113static void *fdt_wrapper_get_parent(const void *devp)
114{
115 return offset_devp(fdt_parent_offset(fdt, devp_offset(devp)));
116}
117
118static void *fdt_wrapper_create_node(const void *devp, const char *name)
119{
120 int offset;
121
122 offset = fdt_add_subnode(fdt, devp_offset(devp), name);
123 if (offset == -FDT_ERR_NOSPACE) {
124 expand_buf(strlen(name) + 16);
125 offset = fdt_add_subnode(fdt, devp_offset(devp), name);
126 }
127
128 return offset_devp(offset);
129}
130
131static void *fdt_wrapper_find_node_by_prop_value(const void *prev,
132 const char *name,
133 const char *val,
134 int len)
135{
136 int offset = fdt_node_offset_by_prop_value(fdt, devp_offset_find(prev),
137 name, val, len);
138 return offset_devp(offset);
139}
140
141static void *fdt_wrapper_find_node_by_compatible(const void *prev,
142 const char *val)
143{
144 int offset = fdt_node_offset_by_compatible(fdt, devp_offset_find(prev),
145 val);
146 return offset_devp(offset);
147}
148
149static char *fdt_wrapper_get_path(const void *devp, char *buf, int len)
150{
151 int rc;
152
153 rc = fdt_get_path(fdt, devp_offset(devp), buf, len);
154 if (check_err(rc))
155 return NULL;
156 return buf;
157}
158
159static unsigned long fdt_wrapper_finalize(void)
160{
161 int rc;
162
163 rc = fdt_pack(fdt);
164 if (rc != 0)
165 fatal("Couldn't pack flat tree: %s\n\r",
166 fdt_strerror(rc));
167 return (unsigned long)fdt;
168}
169
170void fdt_init(void *blob)
171{
172 int err;
173 int bufsize;
174
175 dt_ops.finddevice = fdt_wrapper_finddevice;
176 dt_ops.getprop = fdt_wrapper_getprop;
177 dt_ops.setprop = fdt_wrapper_setprop;
178 dt_ops.get_parent = fdt_wrapper_get_parent;
179 dt_ops.create_node = fdt_wrapper_create_node;
180 dt_ops.find_node_by_prop_value = fdt_wrapper_find_node_by_prop_value;
181 dt_ops.find_node_by_compatible = fdt_wrapper_find_node_by_compatible;
182 dt_ops.del_node = fdt_wrapper_del_node;
183 dt_ops.get_path = fdt_wrapper_get_path;
184 dt_ops.finalize = fdt_wrapper_finalize;
185
186 /* Make sure the dt blob is the right version and so forth */
187 fdt = blob;
188 bufsize = fdt_totalsize(fdt) + EXPAND_GRANULARITY;
189 buf = malloc(bufsize);
190 if(!buf)
191 fatal("malloc failed. can't relocate the device tree\n\r");
192
193 err = fdt_open_into(fdt, buf, bufsize);
194
195 if (err != 0)
196 fatal("fdt_init(): %s\n\r", fdt_strerror(err));
197
198 fdt = buf;
199}