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b5220bc6 SG |
1 | /* |
2 | * Copyright (c) 2011 The Chromium OS Authors. | |
3 | * See file CREDITS for list of people who contributed to this | |
4 | * project. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of | |
9 | * the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
19 | * MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <common.h> | |
23 | #include <serial.h> | |
24 | #include <libfdt.h> | |
25 | #include <fdtdec.h> | |
26 | ||
27 | DECLARE_GLOBAL_DATA_PTR; | |
28 | ||
29 | /* | |
30 | * Here are the type we know about. One day we might allow drivers to | |
31 | * register. For now we just put them here. The COMPAT macro allows us to | |
32 | * turn this into a sparse list later, and keeps the ID with the name. | |
33 | */ | |
34 | #define COMPAT(id, name) name | |
35 | static const char * const compat_names[COMPAT_COUNT] = { | |
f88fe2de | 36 | COMPAT(UNKNOWN, "<none>"), |
b5220bc6 SG |
37 | }; |
38 | ||
a53f4a29 SG |
39 | const char *fdtdec_get_compatible(enum fdt_compat_id id) |
40 | { | |
41 | /* We allow reading of the 'unknown' ID for testing purposes */ | |
42 | assert(id >= 0 && id < COMPAT_COUNT); | |
43 | return compat_names[id]; | |
44 | } | |
45 | ||
b5220bc6 SG |
46 | /** |
47 | * Look in the FDT for an alias with the given name and return its node. | |
48 | * | |
49 | * @param blob FDT blob | |
50 | * @param name alias name to look up | |
51 | * @return node offset if found, or an error code < 0 otherwise | |
52 | */ | |
53 | static int find_alias_node(const void *blob, const char *name) | |
54 | { | |
55 | const char *path; | |
56 | int alias_node; | |
57 | ||
58 | debug("find_alias_node: %s\n", name); | |
59 | alias_node = fdt_path_offset(blob, "/aliases"); | |
60 | if (alias_node < 0) | |
61 | return alias_node; | |
62 | path = fdt_getprop(blob, alias_node, name, NULL); | |
63 | if (!path) | |
64 | return -FDT_ERR_NOTFOUND; | |
65 | return fdt_path_offset(blob, path); | |
66 | } | |
67 | ||
68 | fdt_addr_t fdtdec_get_addr(const void *blob, int node, | |
69 | const char *prop_name) | |
70 | { | |
71 | const fdt_addr_t *cell; | |
72 | int len; | |
73 | ||
74 | debug("get_addr: %s\n", prop_name); | |
75 | cell = fdt_getprop(blob, node, prop_name, &len); | |
76 | if (cell && (len == sizeof(fdt_addr_t) || | |
77 | len == sizeof(fdt_addr_t) * 2)) | |
78 | return fdt_addr_to_cpu(*cell); | |
79 | return FDT_ADDR_T_NONE; | |
80 | } | |
81 | ||
82 | s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, | |
83 | s32 default_val) | |
84 | { | |
85 | const s32 *cell; | |
86 | int len; | |
87 | ||
88 | debug("get_size: %s\n", prop_name); | |
89 | cell = fdt_getprop(blob, node, prop_name, &len); | |
90 | if (cell && len >= sizeof(s32)) | |
91 | return fdt32_to_cpu(cell[0]); | |
92 | return default_val; | |
93 | } | |
94 | ||
f88fe2de | 95 | int fdtdec_get_is_enabled(const void *blob, int node) |
b5220bc6 SG |
96 | { |
97 | const char *cell; | |
98 | ||
f88fe2de SG |
99 | /* |
100 | * It should say "okay", so only allow that. Some fdts use "ok" but | |
101 | * this is a bug. Please fix your device tree source file. See here | |
102 | * for discussion: | |
103 | * | |
104 | * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html | |
105 | */ | |
b5220bc6 SG |
106 | cell = fdt_getprop(blob, node, "status", NULL); |
107 | if (cell) | |
f88fe2de SG |
108 | return 0 == strcmp(cell, "okay"); |
109 | return 1; | |
b5220bc6 SG |
110 | } |
111 | ||
112 | enum fdt_compat_id fd_dec_lookup(const void *blob, int node) | |
113 | { | |
114 | enum fdt_compat_id id; | |
115 | ||
116 | /* Search our drivers */ | |
117 | for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) | |
118 | if (0 == fdt_node_check_compatible(blob, node, | |
119 | compat_names[id])) | |
120 | return id; | |
121 | return COMPAT_UNKNOWN; | |
122 | } | |
123 | ||
124 | int fdtdec_next_compatible(const void *blob, int node, | |
125 | enum fdt_compat_id id) | |
126 | { | |
127 | return fdt_node_offset_by_compatible(blob, node, compat_names[id]); | |
128 | } | |
129 | ||
130 | int fdtdec_next_alias(const void *blob, const char *name, | |
131 | enum fdt_compat_id id, int *upto) | |
132 | { | |
133 | #define MAX_STR_LEN 20 | |
134 | char str[MAX_STR_LEN + 20]; | |
135 | int node, err; | |
136 | ||
137 | /* snprintf() is not available */ | |
138 | assert(strlen(name) < MAX_STR_LEN); | |
139 | sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); | |
b5220bc6 SG |
140 | node = find_alias_node(blob, str); |
141 | if (node < 0) | |
142 | return node; | |
143 | err = fdt_node_check_compatible(blob, node, compat_names[id]); | |
144 | if (err < 0) | |
145 | return err; | |
f88fe2de SG |
146 | if (err) |
147 | return -FDT_ERR_NOTFOUND; | |
148 | (*upto)++; | |
149 | return node; | |
b5220bc6 SG |
150 | } |
151 | ||
a53f4a29 SG |
152 | /* TODO: Can we tighten this code up a little? */ |
153 | int fdtdec_find_aliases_for_id(const void *blob, const char *name, | |
154 | enum fdt_compat_id id, int *node_list, int maxcount) | |
155 | { | |
156 | int name_len = strlen(name); | |
157 | int nodes[maxcount]; | |
158 | int num_found = 0; | |
159 | int offset, node; | |
160 | int alias_node; | |
161 | int count; | |
162 | int i, j; | |
163 | ||
164 | /* find the alias node if present */ | |
165 | alias_node = fdt_path_offset(blob, "/aliases"); | |
166 | ||
167 | /* | |
168 | * start with nothing, and we can assume that the root node can't | |
169 | * match | |
170 | */ | |
171 | memset(nodes, '\0', sizeof(nodes)); | |
172 | ||
173 | /* First find all the compatible nodes */ | |
174 | for (node = count = 0; node >= 0 && count < maxcount;) { | |
175 | node = fdtdec_next_compatible(blob, node, id); | |
176 | if (node >= 0) | |
177 | nodes[count++] = node; | |
178 | } | |
179 | if (node >= 0) | |
180 | debug("%s: warning: maxcount exceeded with alias '%s'\n", | |
181 | __func__, name); | |
182 | ||
183 | /* Now find all the aliases */ | |
184 | memset(node_list, '\0', sizeof(*node_list) * maxcount); | |
185 | ||
186 | for (offset = fdt_first_property_offset(blob, alias_node); | |
187 | offset > 0; | |
188 | offset = fdt_next_property_offset(blob, offset)) { | |
189 | const struct fdt_property *prop; | |
190 | const char *path; | |
191 | int number; | |
192 | int found; | |
193 | ||
194 | node = 0; | |
195 | prop = fdt_get_property_by_offset(blob, offset, NULL); | |
196 | path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); | |
197 | if (prop->len && 0 == strncmp(path, name, name_len)) | |
198 | node = fdt_path_offset(blob, prop->data); | |
199 | if (node <= 0) | |
200 | continue; | |
201 | ||
202 | /* Get the alias number */ | |
203 | number = simple_strtoul(path + name_len, NULL, 10); | |
204 | if (number < 0 || number >= maxcount) { | |
205 | debug("%s: warning: alias '%s' is out of range\n", | |
206 | __func__, path); | |
207 | continue; | |
208 | } | |
209 | ||
210 | /* Make sure the node we found is actually in our list! */ | |
211 | found = -1; | |
212 | for (j = 0; j < count; j++) | |
213 | if (nodes[j] == node) { | |
214 | found = j; | |
215 | break; | |
216 | } | |
217 | ||
218 | if (found == -1) { | |
219 | debug("%s: warning: alias '%s' points to a node " | |
220 | "'%s' that is missing or is not compatible " | |
221 | " with '%s'\n", __func__, path, | |
222 | fdt_get_name(blob, node, NULL), | |
223 | compat_names[id]); | |
224 | continue; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Add this node to our list in the right place, and mark | |
229 | * it as done. | |
230 | */ | |
231 | if (fdtdec_get_is_enabled(blob, node)) { | |
232 | node_list[number] = node; | |
233 | if (number >= num_found) | |
234 | num_found = number + 1; | |
235 | } | |
236 | nodes[j] = 0; | |
237 | } | |
238 | ||
239 | /* Add any nodes not mentioned by an alias */ | |
240 | for (i = j = 0; i < maxcount; i++) { | |
241 | if (!node_list[i]) { | |
242 | for (; j < maxcount; j++) | |
243 | if (nodes[j] && | |
244 | fdtdec_get_is_enabled(blob, nodes[j])) | |
245 | break; | |
246 | ||
247 | /* Have we run out of nodes to add? */ | |
248 | if (j == maxcount) | |
249 | break; | |
250 | ||
251 | assert(!node_list[i]); | |
252 | node_list[i] = nodes[j++]; | |
253 | if (i >= num_found) | |
254 | num_found = i + 1; | |
255 | } | |
256 | } | |
257 | ||
258 | return num_found; | |
259 | } | |
260 | ||
b5220bc6 SG |
261 | /* |
262 | * This function is a little odd in that it accesses global data. At some | |
263 | * point if the architecture board.c files merge this will make more sense. | |
264 | * Even now, it is common code. | |
265 | */ | |
266 | int fdtdec_check_fdt(void) | |
267 | { | |
268 | /* We must have an fdt */ | |
f88fe2de | 269 | if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) |
b5220bc6 SG |
270 | panic("No valid fdt found - please append one to U-Boot\n" |
271 | "binary or define CONFIG_OF_EMBED\n"); | |
272 | return 0; | |
273 | } |