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[qemu.git] / device_tree.c
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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
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25#include "qemu/option.h"
26#include "qemu/config-file.h"
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27
28#include <libfdt.h>
29
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30#define FDT_MAX_SIZE 0x10000
31
32void *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;
62fail:
63 fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));
64 exit(1);
65}
66
7ec632b4 67void *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
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74 *sizep = 0;
75 dt_size = get_image_size(filename_path);
76 if (dt_size < 0) {
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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
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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);
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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;
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108 return fdt;
109
110fail:
7267c094 111 g_free(fdt);
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112 return NULL;
113}
114
ccbcfedd 115static int findnode_nofail(void *fdt, const char *node_path)
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116{
117 int offset;
118
119 offset = fdt_path_offset(fdt, node_path);
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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
129int qemu_devtree_setprop(void *fdt, const char *node_path,
45e9dfb2 130 const char *property, const void *val_array, int size)
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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;
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142}
143
144int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
145 const char *property, uint32_t val)
146{
ccbcfedd 147 int r;
f652e6af 148
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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;
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157}
158
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159int 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
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166int qemu_devtree_setprop_string(void *fdt, const char *node_path,
167 const char *property, const char *string)
168{
ccbcfedd 169 int r;
f652e6af 170
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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
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181const 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
198uint32_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
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211uint32_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
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225int 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);
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230 return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
231}
232
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233uint32_t qemu_devtree_alloc_phandle(void *fdt)
234{
4b1b1c89
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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 }
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260
261 return phandle++;
262}
263
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264int qemu_devtree_nop_node(void *fdt, const char *node_path)
265{
ccbcfedd 266 int r;
d69a8e63 267
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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}
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277
278int qemu_devtree_add_subnode(void *fdt, const char *name)
279{
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280 char *dupname = g_strdup(name);
281 char *basename = strrchr(dupname, '/');
282 int retval;
c640d088 283 int parent = 0;
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284
285 if (!basename) {
bff39b63 286 g_free(dupname);
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287 return -1;
288 }
289
290 basename[0] = '\0';
291 basename++;
292
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293 if (dupname[0]) {
294 parent = findnode_nofail(fdt, dupname);
295 }
296
297 retval = fdt_add_subnode(fdt, parent, basename);
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298 if (retval < 0) {
299 fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name,
300 fdt_strerror(retval));
301 exit(1);
80ad7816
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302 }
303
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304 g_free(dupname);
305 return retval;
306}
71193433
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307
308void 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
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318 }
319 }
320
321}