Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / device_tree.c
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"
23 #include "sysemu/device_tree.h"
24 #include "sysemu/sysemu.h"
25 #include "hw/loader.h"
26 #include "qemu/option.h"
27 #include "qemu/config-file.h"
28
29 #include <libfdt.h>
30
31 #define FDT_MAX_SIZE 0x10000
32
33 void *create_device_tree(int *sizep)
34 {
35 void *fdt;
36 int ret;
37
38 *sizep = FDT_MAX_SIZE;
39 fdt = g_malloc0(FDT_MAX_SIZE);
40 ret = fdt_create(fdt, FDT_MAX_SIZE);
41 if (ret < 0) {
42 goto fail;
43 }
44 ret = fdt_finish_reservemap(fdt);
45 if (ret < 0) {
46 goto fail;
47 }
48 ret = fdt_begin_node(fdt, "");
49 if (ret < 0) {
50 goto fail;
51 }
52 ret = fdt_end_node(fdt);
53 if (ret < 0) {
54 goto fail;
55 }
56 ret = fdt_finish(fdt);
57 if (ret < 0) {
58 goto fail;
59 }
60 ret = fdt_open_into(fdt, fdt, *sizep);
61 if (ret) {
62 fprintf(stderr, "Unable to copy device tree in memory\n");
63 exit(1);
64 }
65
66 return fdt;
67 fail:
68 fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));
69 exit(1);
70 }
71
72 void *load_device_tree(const char *filename_path, int *sizep)
73 {
74 int dt_size;
75 int dt_file_load_size;
76 int ret;
77 void *fdt = NULL;
78
79 *sizep = 0;
80 dt_size = get_image_size(filename_path);
81 if (dt_size < 0) {
82 printf("Unable to get size of device tree file '%s'\n",
83 filename_path);
84 goto fail;
85 }
86
87 /* Expand to 2x size to give enough room for manipulation. */
88 dt_size += 10000;
89 dt_size *= 2;
90 /* First allocate space in qemu for device tree */
91 fdt = g_malloc0(dt_size);
92
93 dt_file_load_size = load_image(filename_path, fdt);
94 if (dt_file_load_size < 0) {
95 printf("Unable to open device tree file '%s'\n",
96 filename_path);
97 goto fail;
98 }
99
100 ret = fdt_open_into(fdt, fdt, dt_size);
101 if (ret) {
102 printf("Unable to copy device tree in memory\n");
103 goto fail;
104 }
105
106 /* Check sanity of device tree */
107 if (fdt_check_header(fdt)) {
108 printf ("Device tree file loaded into memory is invalid: %s\n",
109 filename_path);
110 goto fail;
111 }
112 *sizep = dt_size;
113 return fdt;
114
115 fail:
116 g_free(fdt);
117 return NULL;
118 }
119
120 static int findnode_nofail(void *fdt, const char *node_path)
121 {
122 int offset;
123
124 offset = fdt_path_offset(fdt, node_path);
125 if (offset < 0) {
126 fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path,
127 fdt_strerror(offset));
128 exit(1);
129 }
130
131 return offset;
132 }
133
134 int qemu_fdt_setprop(void *fdt, const char *node_path,
135 const char *property, const void *val, int size)
136 {
137 int r;
138
139 r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val, size);
140 if (r < 0) {
141 fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path,
142 property, fdt_strerror(r));
143 exit(1);
144 }
145
146 return r;
147 }
148
149 int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
150 const char *property, uint32_t val)
151 {
152 int r;
153
154 r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
155 if (r < 0) {
156 fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__,
157 node_path, property, val, fdt_strerror(r));
158 exit(1);
159 }
160
161 return r;
162 }
163
164 int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
165 const char *property, uint64_t val)
166 {
167 val = cpu_to_be64(val);
168 return qemu_fdt_setprop(fdt, node_path, property, &val, sizeof(val));
169 }
170
171 int qemu_fdt_setprop_string(void *fdt, const char *node_path,
172 const char *property, const char *string)
173 {
174 int r;
175
176 r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
177 if (r < 0) {
178 fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__,
179 node_path, property, string, fdt_strerror(r));
180 exit(1);
181 }
182
183 return r;
184 }
185
186 const void *qemu_fdt_getprop(void *fdt, const char *node_path,
187 const char *property, int *lenp)
188 {
189 int len;
190 const void *r;
191 if (!lenp) {
192 lenp = &len;
193 }
194 r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
195 if (!r) {
196 fprintf(stderr, "%s: Couldn't get %s/%s: %s\n", __func__,
197 node_path, property, fdt_strerror(*lenp));
198 exit(1);
199 }
200 return r;
201 }
202
203 uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
204 const char *property)
205 {
206 int len;
207 const uint32_t *p = qemu_fdt_getprop(fdt, node_path, property, &len);
208 if (len != 4) {
209 fprintf(stderr, "%s: %s/%s not 4 bytes long (not a cell?)\n",
210 __func__, node_path, property);
211 exit(1);
212 }
213 return be32_to_cpu(*p);
214 }
215
216 uint32_t qemu_fdt_get_phandle(void *fdt, const char *path)
217 {
218 uint32_t r;
219
220 r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
221 if (r == 0) {
222 fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__,
223 path, fdt_strerror(r));
224 exit(1);
225 }
226
227 return r;
228 }
229
230 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
231 const char *property,
232 const char *target_node_path)
233 {
234 uint32_t phandle = qemu_fdt_get_phandle(fdt, target_node_path);
235 return qemu_fdt_setprop_cell(fdt, node_path, property, phandle);
236 }
237
238 uint32_t qemu_fdt_alloc_phandle(void *fdt)
239 {
240 static int phandle = 0x0;
241
242 /*
243 * We need to find out if the user gave us special instruction at
244 * which phandle id to start allocting phandles.
245 */
246 if (!phandle) {
247 phandle = qemu_opt_get_number(qemu_get_machine_opts(),
248 "phandle_start", 0);
249 }
250
251 if (!phandle) {
252 /*
253 * None or invalid phandle given on the command line, so fall back to
254 * default starting point.
255 */
256 phandle = 0x8000;
257 }
258
259 return phandle++;
260 }
261
262 int qemu_fdt_nop_node(void *fdt, const char *node_path)
263 {
264 int r;
265
266 r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
267 if (r < 0) {
268 fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path,
269 fdt_strerror(r));
270 exit(1);
271 }
272
273 return r;
274 }
275
276 int qemu_fdt_add_subnode(void *fdt, const char *name)
277 {
278 char *dupname = g_strdup(name);
279 char *basename = strrchr(dupname, '/');
280 int retval;
281 int parent = 0;
282
283 if (!basename) {
284 g_free(dupname);
285 return -1;
286 }
287
288 basename[0] = '\0';
289 basename++;
290
291 if (dupname[0]) {
292 parent = findnode_nofail(fdt, dupname);
293 }
294
295 retval = fdt_add_subnode(fdt, parent, basename);
296 if (retval < 0) {
297 fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name,
298 fdt_strerror(retval));
299 exit(1);
300 }
301
302 g_free(dupname);
303 return retval;
304 }
305
306 void qemu_fdt_dumpdtb(void *fdt, int size)
307 {
308 const char *dumpdtb = qemu_opt_get(qemu_get_machine_opts(), "dumpdtb");
309
310 if (dumpdtb) {
311 /* Dump the dtb to a file and quit */
312 exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
313 }
314 }
315
316 int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
317 const char *node_path,
318 const char *property,
319 int numvalues,
320 uint64_t *values)
321 {
322 uint32_t *propcells;
323 uint64_t value;
324 int cellnum, vnum, ncells;
325 uint32_t hival;
326
327 propcells = g_new0(uint32_t, numvalues * 2);
328
329 cellnum = 0;
330 for (vnum = 0; vnum < numvalues; vnum++) {
331 ncells = values[vnum * 2];
332 if (ncells != 1 && ncells != 2) {
333 return -1;
334 }
335 value = values[vnum * 2 + 1];
336 hival = cpu_to_be32(value >> 32);
337 if (ncells > 1) {
338 propcells[cellnum++] = hival;
339 } else if (hival != 0) {
340 return -1;
341 }
342 propcells[cellnum++] = cpu_to_be32(value);
343 }
344
345 return qemu_fdt_setprop(fdt, node_path, property, propcells,
346 cellnum * sizeof(uint32_t));
347 }