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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" | |
23 | #include "device_tree.h" | |
24 | #include "hw/loader.h" | |
25 | #include "qemu-option.h" | |
26 | #include "qemu-config.h" | |
27 | ||
28 | #include <libfdt.h> | |
29 | ||
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 | ||
67 | void *load_device_tree(const char *filename_path, int *sizep) | |
68 | { | |
69 | int dt_size; | |
70 | int dt_file_load_size; | |
71 | int ret; | |
72 | void *fdt = NULL; | |
73 | ||
74 | *sizep = 0; | |
75 | dt_size = get_image_size(filename_path); | |
76 | if (dt_size < 0) { | |
77 | printf("Unable to get size of device tree file '%s'\n", | |
78 | filename_path); | |
79 | goto fail; | |
80 | } | |
81 | ||
82 | /* Expand to 2x size to give enough room for manipulation. */ | |
83 | dt_size += 10000; | |
84 | dt_size *= 2; | |
85 | /* First allocate space in qemu for device tree */ | |
86 | fdt = g_malloc0(dt_size); | |
87 | ||
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 | } | |
94 | ||
95 | ret = fdt_open_into(fdt, fdt, dt_size); | |
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 | } | |
107 | *sizep = dt_size; | |
108 | return fdt; | |
109 | ||
110 | fail: | |
111 | g_free(fdt); | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | static int findnode_nofail(void *fdt, const char *node_path) | |
116 | { | |
117 | int offset; | |
118 | ||
119 | offset = fdt_path_offset(fdt, node_path); | |
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, | |
130 | const char *property, const void *val_array, int size) | |
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 | } | |
140 | ||
141 | return r; | |
142 | } | |
143 | ||
144 | int qemu_devtree_setprop_cell(void *fdt, const char *node_path, | |
145 | const char *property, uint32_t val) | |
146 | { | |
147 | int r; | |
148 | ||
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 | } | |
155 | ||
156 | return r; | |
157 | } | |
158 | ||
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 | ||
166 | int qemu_devtree_setprop_string(void *fdt, const char *node_path, | |
167 | const char *property, const char *string) | |
168 | { | |
169 | int r; | |
170 | ||
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 | } | |
177 | ||
178 | return r; | |
179 | } | |
180 | ||
181 | uint32_t qemu_devtree_get_phandle(void *fdt, const char *path) | |
182 | { | |
183 | uint32_t r; | |
184 | ||
185 | r = fdt_get_phandle(fdt, findnode_nofail(fdt, path)); | |
186 | if (r <= 0) { | |
187 | fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__, | |
188 | path, fdt_strerror(r)); | |
189 | exit(1); | |
190 | } | |
191 | ||
192 | return r; | |
193 | } | |
194 | ||
195 | int qemu_devtree_setprop_phandle(void *fdt, const char *node_path, | |
196 | const char *property, | |
197 | const char *target_node_path) | |
198 | { | |
199 | uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path); | |
200 | return qemu_devtree_setprop_cell(fdt, node_path, property, phandle); | |
201 | } | |
202 | ||
203 | uint32_t qemu_devtree_alloc_phandle(void *fdt) | |
204 | { | |
205 | static int phandle = 0x0; | |
206 | ||
207 | /* | |
208 | * We need to find out if the user gave us special instruction at | |
209 | * which phandle id to start allocting phandles. | |
210 | */ | |
211 | if (!phandle) { | |
212 | QemuOpts *machine_opts; | |
213 | machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0); | |
214 | if (machine_opts) { | |
215 | const char *phandle_start; | |
216 | phandle_start = qemu_opt_get(machine_opts, "phandle_start"); | |
217 | if (phandle_start) { | |
218 | phandle = strtoul(phandle_start, NULL, 0); | |
219 | } | |
220 | } | |
221 | } | |
222 | ||
223 | if (!phandle) { | |
224 | /* | |
225 | * None or invalid phandle given on the command line, so fall back to | |
226 | * default starting point. | |
227 | */ | |
228 | phandle = 0x8000; | |
229 | } | |
230 | ||
231 | return phandle++; | |
232 | } | |
233 | ||
234 | int qemu_devtree_nop_node(void *fdt, const char *node_path) | |
235 | { | |
236 | int r; | |
237 | ||
238 | r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path)); | |
239 | if (r < 0) { | |
240 | fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path, | |
241 | fdt_strerror(r)); | |
242 | exit(1); | |
243 | } | |
244 | ||
245 | return r; | |
246 | } | |
247 | ||
248 | int qemu_devtree_add_subnode(void *fdt, const char *name) | |
249 | { | |
250 | char *dupname = g_strdup(name); | |
251 | char *basename = strrchr(dupname, '/'); | |
252 | int retval; | |
253 | int parent = 0; | |
254 | ||
255 | if (!basename) { | |
256 | g_free(dupname); | |
257 | return -1; | |
258 | } | |
259 | ||
260 | basename[0] = '\0'; | |
261 | basename++; | |
262 | ||
263 | if (dupname[0]) { | |
264 | parent = findnode_nofail(fdt, dupname); | |
265 | } | |
266 | ||
267 | retval = fdt_add_subnode(fdt, parent, basename); | |
268 | if (retval < 0) { | |
269 | fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name, | |
270 | fdt_strerror(retval)); | |
271 | exit(1); | |
272 | } | |
273 | ||
274 | g_free(dupname); | |
275 | return retval; | |
276 | } |