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Commit | Line | Data |
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f652e6af AJ |
1 | /* |
2 | * Functions to help device tree manipulation using libfdt. | |
3 | * It also provides functions to read entries from device tree proc | |
4 | * interface. | |
5 | * | |
6 | * Copyright 2008 IBM Corporation. | |
7 | * Authors: Jerone Young <jyoung5@us.ibm.com> | |
8 | * Hollis Blanchard <hollisb@us.ibm.com> | |
9 | * | |
10 | * This work is licensed under the GNU GPL license version 2 or later. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <stdio.h> | |
15 | #include <sys/types.h> | |
16 | #include <sys/stat.h> | |
17 | #include <fcntl.h> | |
18 | #include <unistd.h> | |
19 | #include <stdlib.h> | |
20 | ||
21 | #include "config.h" | |
22 | #include "qemu-common.h" | |
9c17d615 | 23 | #include "sysemu/device_tree.h" |
39b7f20e | 24 | #include "hw/loader.h" |
1de7afc9 PB |
25 | #include "qemu/option.h" |
26 | #include "qemu/config-file.h" | |
f652e6af AJ |
27 | |
28 | #include <libfdt.h> | |
29 | ||
ce36252c AG |
30 | #define FDT_MAX_SIZE 0x10000 |
31 | ||
32 | void *create_device_tree(int *sizep) | |
33 | { | |
34 | void *fdt; | |
35 | int ret; | |
36 | ||
37 | *sizep = FDT_MAX_SIZE; | |
38 | fdt = g_malloc0(FDT_MAX_SIZE); | |
39 | ret = fdt_create(fdt, FDT_MAX_SIZE); | |
40 | if (ret < 0) { | |
41 | goto fail; | |
42 | } | |
43 | ret = fdt_begin_node(fdt, ""); | |
44 | if (ret < 0) { | |
45 | goto fail; | |
46 | } | |
47 | ret = fdt_end_node(fdt); | |
48 | if (ret < 0) { | |
49 | goto fail; | |
50 | } | |
51 | ret = fdt_finish(fdt); | |
52 | if (ret < 0) { | |
53 | goto fail; | |
54 | } | |
55 | ret = fdt_open_into(fdt, fdt, *sizep); | |
56 | if (ret) { | |
57 | fprintf(stderr, "Unable to copy device tree in memory\n"); | |
58 | exit(1); | |
59 | } | |
60 | ||
61 | return fdt; | |
62 | fail: | |
63 | fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret)); | |
64 | exit(1); | |
65 | } | |
66 | ||
7ec632b4 | 67 | void *load_device_tree(const char *filename_path, int *sizep) |
f652e6af | 68 | { |
7ec632b4 | 69 | int dt_size; |
f652e6af | 70 | int dt_file_load_size; |
f652e6af | 71 | int ret; |
7ec632b4 | 72 | void *fdt = NULL; |
f652e6af | 73 | |
7ec632b4 PB |
74 | *sizep = 0; |
75 | dt_size = get_image_size(filename_path); | |
76 | if (dt_size < 0) { | |
f652e6af AJ |
77 | printf("Unable to get size of device tree file '%s'\n", |
78 | filename_path); | |
79 | goto fail; | |
80 | } | |
81 | ||
7ec632b4 | 82 | /* Expand to 2x size to give enough room for manipulation. */ |
ded57c5f | 83 | dt_size += 10000; |
7ec632b4 | 84 | dt_size *= 2; |
f652e6af | 85 | /* First allocate space in qemu for device tree */ |
7267c094 | 86 | fdt = g_malloc0(dt_size); |
f652e6af | 87 | |
7ec632b4 PB |
88 | dt_file_load_size = load_image(filename_path, fdt); |
89 | if (dt_file_load_size < 0) { | |
90 | printf("Unable to open device tree file '%s'\n", | |
91 | filename_path); | |
92 | goto fail; | |
93 | } | |
f652e6af | 94 | |
7ec632b4 | 95 | ret = fdt_open_into(fdt, fdt, dt_size); |
f652e6af AJ |
96 | if (ret) { |
97 | printf("Unable to copy device tree in memory\n"); | |
98 | goto fail; | |
99 | } | |
100 | ||
101 | /* Check sanity of device tree */ | |
102 | if (fdt_check_header(fdt)) { | |
103 | printf ("Device tree file loaded into memory is invalid: %s\n", | |
104 | filename_path); | |
105 | goto fail; | |
106 | } | |
7ec632b4 | 107 | *sizep = dt_size; |
f652e6af AJ |
108 | return fdt; |
109 | ||
110 | fail: | |
7267c094 | 111 | g_free(fdt); |
f652e6af AJ |
112 | return NULL; |
113 | } | |
114 | ||
ccbcfedd | 115 | static int findnode_nofail(void *fdt, const char *node_path) |
f652e6af AJ |
116 | { |
117 | int offset; | |
118 | ||
119 | offset = fdt_path_offset(fdt, node_path); | |
ccbcfedd AG |
120 | if (offset < 0) { |
121 | fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path, | |
122 | fdt_strerror(offset)); | |
123 | exit(1); | |
124 | } | |
125 | ||
126 | return offset; | |
127 | } | |
128 | ||
129 | int qemu_devtree_setprop(void *fdt, const char *node_path, | |
45e9dfb2 | 130 | const char *property, const void *val_array, int size) |
ccbcfedd AG |
131 | { |
132 | int r; | |
133 | ||
134 | r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val_array, size); | |
135 | if (r < 0) { | |
136 | fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path, | |
137 | property, fdt_strerror(r)); | |
138 | exit(1); | |
139 | } | |
f652e6af | 140 | |
ccbcfedd | 141 | return r; |
f652e6af AJ |
142 | } |
143 | ||
144 | int qemu_devtree_setprop_cell(void *fdt, const char *node_path, | |
145 | const char *property, uint32_t val) | |
146 | { | |
ccbcfedd | 147 | int r; |
f652e6af | 148 | |
ccbcfedd AG |
149 | r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val); |
150 | if (r < 0) { | |
151 | fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__, | |
152 | node_path, property, val, fdt_strerror(r)); | |
153 | exit(1); | |
154 | } | |
f652e6af | 155 | |
ccbcfedd | 156 | return r; |
f652e6af AJ |
157 | } |
158 | ||
bb28eb37 AG |
159 | int qemu_devtree_setprop_u64(void *fdt, const char *node_path, |
160 | const char *property, uint64_t val) | |
161 | { | |
162 | val = cpu_to_be64(val); | |
163 | return qemu_devtree_setprop(fdt, node_path, property, &val, sizeof(val)); | |
164 | } | |
165 | ||
f652e6af AJ |
166 | int qemu_devtree_setprop_string(void *fdt, const char *node_path, |
167 | const char *property, const char *string) | |
168 | { | |
ccbcfedd | 169 | int r; |
f652e6af | 170 | |
ccbcfedd AG |
171 | r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string); |
172 | if (r < 0) { | |
173 | fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__, | |
174 | node_path, property, string, fdt_strerror(r)); | |
175 | exit(1); | |
176 | } | |
f652e6af | 177 | |
ccbcfedd | 178 | return r; |
f652e6af | 179 | } |
d69a8e63 | 180 | |
f0aa713f PM |
181 | const void *qemu_devtree_getprop(void *fdt, const char *node_path, |
182 | const char *property, int *lenp) | |
183 | { | |
184 | int len; | |
185 | const void *r; | |
186 | if (!lenp) { | |
187 | lenp = &len; | |
188 | } | |
189 | r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp); | |
190 | if (!r) { | |
191 | fprintf(stderr, "%s: Couldn't get %s/%s: %s\n", __func__, | |
192 | node_path, property, fdt_strerror(*lenp)); | |
193 | exit(1); | |
194 | } | |
195 | return r; | |
196 | } | |
197 | ||
198 | uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path, | |
199 | const char *property) | |
200 | { | |
201 | int len; | |
202 | const uint32_t *p = qemu_devtree_getprop(fdt, node_path, property, &len); | |
203 | if (len != 4) { | |
204 | fprintf(stderr, "%s: %s/%s not 4 bytes long (not a cell?)\n", | |
205 | __func__, node_path, property); | |
206 | exit(1); | |
207 | } | |
208 | return be32_to_cpu(*p); | |
209 | } | |
210 | ||
7d5fd108 AG |
211 | uint32_t qemu_devtree_get_phandle(void *fdt, const char *path) |
212 | { | |
213 | uint32_t r; | |
214 | ||
215 | r = fdt_get_phandle(fdt, findnode_nofail(fdt, path)); | |
216 | if (r <= 0) { | |
217 | fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__, | |
218 | path, fdt_strerror(r)); | |
219 | exit(1); | |
220 | } | |
221 | ||
222 | return r; | |
223 | } | |
224 | ||
8535ab12 AG |
225 | int qemu_devtree_setprop_phandle(void *fdt, const char *node_path, |
226 | const char *property, | |
227 | const char *target_node_path) | |
228 | { | |
7d5fd108 | 229 | uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path); |
8535ab12 AG |
230 | return qemu_devtree_setprop_cell(fdt, node_path, property, phandle); |
231 | } | |
232 | ||
3601b572 AG |
233 | uint32_t qemu_devtree_alloc_phandle(void *fdt) |
234 | { | |
4b1b1c89 AG |
235 | static int phandle = 0x0; |
236 | ||
237 | /* | |
238 | * We need to find out if the user gave us special instruction at | |
239 | * which phandle id to start allocting phandles. | |
240 | */ | |
241 | if (!phandle) { | |
242 | QemuOpts *machine_opts; | |
243 | machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0); | |
244 | if (machine_opts) { | |
245 | const char *phandle_start; | |
246 | phandle_start = qemu_opt_get(machine_opts, "phandle_start"); | |
247 | if (phandle_start) { | |
248 | phandle = strtoul(phandle_start, NULL, 0); | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | if (!phandle) { | |
254 | /* | |
255 | * None or invalid phandle given on the command line, so fall back to | |
256 | * default starting point. | |
257 | */ | |
258 | phandle = 0x8000; | |
259 | } | |
3601b572 AG |
260 | |
261 | return phandle++; | |
262 | } | |
263 | ||
d69a8e63 AG |
264 | int qemu_devtree_nop_node(void *fdt, const char *node_path) |
265 | { | |
ccbcfedd | 266 | int r; |
d69a8e63 | 267 | |
ccbcfedd AG |
268 | r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path)); |
269 | if (r < 0) { | |
270 | fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path, | |
271 | fdt_strerror(r)); | |
272 | exit(1); | |
273 | } | |
d69a8e63 | 274 | |
ccbcfedd | 275 | return r; |
d69a8e63 | 276 | } |
80ad7816 AG |
277 | |
278 | int qemu_devtree_add_subnode(void *fdt, const char *name) | |
279 | { | |
80ad7816 AG |
280 | char *dupname = g_strdup(name); |
281 | char *basename = strrchr(dupname, '/'); | |
282 | int retval; | |
c640d088 | 283 | int parent = 0; |
80ad7816 AG |
284 | |
285 | if (!basename) { | |
bff39b63 | 286 | g_free(dupname); |
80ad7816 AG |
287 | return -1; |
288 | } | |
289 | ||
290 | basename[0] = '\0'; | |
291 | basename++; | |
292 | ||
c640d088 AG |
293 | if (dupname[0]) { |
294 | parent = findnode_nofail(fdt, dupname); | |
295 | } | |
296 | ||
297 | retval = fdt_add_subnode(fdt, parent, basename); | |
ccbcfedd AG |
298 | if (retval < 0) { |
299 | fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name, | |
300 | fdt_strerror(retval)); | |
301 | exit(1); | |
80ad7816 AG |
302 | } |
303 | ||
80ad7816 AG |
304 | g_free(dupname); |
305 | return retval; | |
306 | } | |
71193433 AG |
307 | |
308 | void qemu_devtree_dumpdtb(void *fdt, int size) | |
309 | { | |
310 | QemuOpts *machine_opts; | |
311 | ||
312 | machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0); | |
313 | if (machine_opts) { | |
314 | const char *dumpdtb = qemu_opt_get(machine_opts, "dumpdtb"); | |
315 | if (dumpdtb) { | |
316 | /* Dump the dtb to a file and quit */ | |
6641b772 | 317 | exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1); |
71193433 AG |
318 | } |
319 | } | |
320 | ||
321 | } |