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af6074fc | 1 | // SPDX-License-Identifier: GPL-2.0+ |
97e873e5 SR |
2 | /* |
3 | * Procedures for creating, accessing and interpreting the device tree. | |
4 | * | |
5 | * Paul Mackerras August 1996. | |
6 | * Copyright (C) 1996-2005 Paul Mackerras. | |
7 | * | |
8 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. | |
9 | * {engebret|bergner}@us.ibm.com | |
10 | * | |
11 | * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net | |
12 | * | |
e91edcf5 GL |
13 | * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and |
14 | * Grant Likely. | |
97e873e5 | 15 | */ |
606ad42a RH |
16 | |
17 | #define pr_fmt(fmt) "OF: " fmt | |
18 | ||
b1078c35 | 19 | #include <linux/bitmap.h> |
3482f2c5 | 20 | #include <linux/console.h> |
611cad72 | 21 | #include <linux/ctype.h> |
183912d3 | 22 | #include <linux/cpu.h> |
97e873e5 SR |
23 | #include <linux/module.h> |
24 | #include <linux/of.h> | |
5fa23530 | 25 | #include <linux/of_device.h> |
fd9fdb78 | 26 | #include <linux/of_graph.h> |
581b605a | 27 | #include <linux/spinlock.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
75b57ecf | 29 | #include <linux/string.h> |
a9f2f63a | 30 | #include <linux/proc_fs.h> |
581b605a | 31 | |
ced4eec9 | 32 | #include "of_private.h" |
611cad72 | 33 | |
ced4eec9 | 34 | LIST_HEAD(aliases_lookup); |
611cad72 | 35 | |
5063e25a GL |
36 | struct device_node *of_root; |
37 | EXPORT_SYMBOL(of_root); | |
fc0bdae4 | 38 | struct device_node *of_chosen; |
ec7cc3f7 | 39 | EXPORT_SYMBOL(of_chosen); |
611cad72 | 40 | struct device_node *of_aliases; |
a752ee56 | 41 | struct device_node *of_stdout; |
7914a7c5 | 42 | static const char *of_stdout_options; |
611cad72 | 43 | |
8a2b22a2 | 44 | struct kset *of_kset; |
75b57ecf GL |
45 | |
46 | /* | |
8a2b22a2 GL |
47 | * Used to protect the of_aliases, to hold off addition of nodes to sysfs. |
48 | * This mutex must be held whenever modifications are being made to the | |
49 | * device tree. The of_{attach,detach}_node() and | |
50 | * of_{add,remove,update}_property() helpers make sure this happens. | |
75b57ecf | 51 | */ |
c05aba2b | 52 | DEFINE_MUTEX(of_mutex); |
1ef4d424 | 53 | |
5063e25a | 54 | /* use when traversing tree through the child, sibling, |
581b605a SR |
55 | * or parent members of struct device_node. |
56 | */ | |
d6d3c4e6 | 57 | DEFINE_RAW_SPINLOCK(devtree_lock); |
97e873e5 | 58 | |
f42b0e18 RH |
59 | bool of_node_name_eq(const struct device_node *np, const char *name) |
60 | { | |
61 | const char *node_name; | |
62 | size_t len; | |
63 | ||
64 | if (!np) | |
65 | return false; | |
66 | ||
67 | node_name = kbasename(np->full_name); | |
68 | len = strchrnul(node_name, '@') - node_name; | |
69 | ||
70 | return (strlen(name) == len) && (strncmp(node_name, name, len) == 0); | |
71 | } | |
173ee396 | 72 | EXPORT_SYMBOL(of_node_name_eq); |
f42b0e18 RH |
73 | |
74 | bool of_node_name_prefix(const struct device_node *np, const char *prefix) | |
75 | { | |
76 | if (!np) | |
77 | return false; | |
78 | ||
79 | return strncmp(kbasename(np->full_name), prefix, strlen(prefix)) == 0; | |
80 | } | |
173ee396 | 81 | EXPORT_SYMBOL(of_node_name_prefix); |
f42b0e18 | 82 | |
e8b1dee2 RH |
83 | static bool __of_node_is_type(const struct device_node *np, const char *type) |
84 | { | |
85 | const char *match = __of_get_property(np, "device_type", NULL); | |
86 | ||
87 | return np && match && type && !strcmp(match, type); | |
88 | } | |
89 | ||
b68ac8dc | 90 | int of_bus_n_addr_cells(struct device_node *np) |
97e873e5 | 91 | { |
8832963d | 92 | u32 cells; |
97e873e5 | 93 | |
b68ac8dc | 94 | for (; np; np = np->parent) |
8832963d SS |
95 | if (!of_property_read_u32(np, "#address-cells", &cells)) |
96 | return cells; | |
b68ac8dc | 97 | |
97e873e5 SR |
98 | /* No #address-cells property for the root node */ |
99 | return OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
100 | } | |
b68ac8dc RM |
101 | |
102 | int of_n_addr_cells(struct device_node *np) | |
103 | { | |
104 | if (np->parent) | |
105 | np = np->parent; | |
106 | ||
107 | return of_bus_n_addr_cells(np); | |
108 | } | |
97e873e5 SR |
109 | EXPORT_SYMBOL(of_n_addr_cells); |
110 | ||
b68ac8dc | 111 | int of_bus_n_size_cells(struct device_node *np) |
97e873e5 | 112 | { |
8832963d | 113 | u32 cells; |
97e873e5 | 114 | |
b68ac8dc | 115 | for (; np; np = np->parent) |
8832963d SS |
116 | if (!of_property_read_u32(np, "#size-cells", &cells)) |
117 | return cells; | |
b68ac8dc | 118 | |
97e873e5 SR |
119 | /* No #size-cells property for the root node */ |
120 | return OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
121 | } | |
b68ac8dc RM |
122 | |
123 | int of_n_size_cells(struct device_node *np) | |
124 | { | |
125 | if (np->parent) | |
126 | np = np->parent; | |
127 | ||
128 | return of_bus_n_size_cells(np); | |
129 | } | |
97e873e5 SR |
130 | EXPORT_SYMBOL(of_n_size_cells); |
131 | ||
0c3f061c RH |
132 | #ifdef CONFIG_NUMA |
133 | int __weak of_node_to_nid(struct device_node *np) | |
134 | { | |
c8fff7bc | 135 | return NUMA_NO_NODE; |
0c3f061c RH |
136 | } |
137 | #endif | |
138 | ||
90dc0d1c RH |
139 | #define OF_PHANDLE_CACHE_BITS 7 |
140 | #define OF_PHANDLE_CACHE_SZ BIT(OF_PHANDLE_CACHE_BITS) | |
b8a9ac1a | 141 | |
90dc0d1c | 142 | static struct device_node *phandle_cache[OF_PHANDLE_CACHE_SZ]; |
b8a9ac1a | 143 | |
90dc0d1c | 144 | static u32 of_phandle_cache_hash(phandle handle) |
b8a9ac1a | 145 | { |
90dc0d1c | 146 | return hash_32(handle, OF_PHANDLE_CACHE_BITS); |
b8a9ac1a FR |
147 | } |
148 | ||
5801169a FR |
149 | /* |
150 | * Caller must hold devtree_lock. | |
151 | */ | |
90dc0d1c | 152 | void __of_phandle_cache_inv_entry(phandle handle) |
5801169a | 153 | { |
90dc0d1c | 154 | u32 handle_hash; |
5801169a FR |
155 | struct device_node *np; |
156 | ||
157 | if (!handle) | |
158 | return; | |
159 | ||
90dc0d1c | 160 | handle_hash = of_phandle_cache_hash(handle); |
5801169a | 161 | |
90dc0d1c RH |
162 | np = phandle_cache[handle_hash]; |
163 | if (np && handle == np->phandle) | |
164 | phandle_cache[handle_hash] = NULL; | |
0b3ce78e FR |
165 | } |
166 | ||
194ec936 | 167 | void __init of_core_init(void) |
75b57ecf GL |
168 | { |
169 | struct device_node *np; | |
170 | ||
0b3ce78e | 171 | |
75b57ecf | 172 | /* Create the kset, and register existing nodes */ |
c05aba2b | 173 | mutex_lock(&of_mutex); |
75b57ecf GL |
174 | of_kset = kset_create_and_add("devicetree", NULL, firmware_kobj); |
175 | if (!of_kset) { | |
c05aba2b | 176 | mutex_unlock(&of_mutex); |
606ad42a | 177 | pr_err("failed to register existing nodes\n"); |
194ec936 | 178 | return; |
75b57ecf | 179 | } |
90dc0d1c | 180 | for_each_of_allnodes(np) { |
8a2b22a2 | 181 | __of_attach_node_sysfs(np); |
90dc0d1c RH |
182 | if (np->phandle && !phandle_cache[of_phandle_cache_hash(np->phandle)]) |
183 | phandle_cache[of_phandle_cache_hash(np->phandle)] = np; | |
184 | } | |
c05aba2b | 185 | mutex_unlock(&of_mutex); |
75b57ecf | 186 | |
8357041a | 187 | /* Symlink in /proc as required by userspace ABI */ |
5063e25a | 188 | if (of_root) |
75b57ecf | 189 | proc_symlink("device-tree", NULL, "/sys/firmware/devicetree/base"); |
75b57ecf | 190 | } |
75b57ecf | 191 | |
28d0e36b TG |
192 | static struct property *__of_find_property(const struct device_node *np, |
193 | const char *name, int *lenp) | |
581b605a SR |
194 | { |
195 | struct property *pp; | |
196 | ||
64e4566f TT |
197 | if (!np) |
198 | return NULL; | |
199 | ||
a3a7cab1 | 200 | for (pp = np->properties; pp; pp = pp->next) { |
581b605a | 201 | if (of_prop_cmp(pp->name, name) == 0) { |
a3a7cab1 | 202 | if (lenp) |
581b605a SR |
203 | *lenp = pp->length; |
204 | break; | |
205 | } | |
206 | } | |
28d0e36b TG |
207 | |
208 | return pp; | |
209 | } | |
210 | ||
211 | struct property *of_find_property(const struct device_node *np, | |
212 | const char *name, | |
213 | int *lenp) | |
214 | { | |
215 | struct property *pp; | |
d6d3c4e6 | 216 | unsigned long flags; |
28d0e36b | 217 | |
d6d3c4e6 | 218 | raw_spin_lock_irqsave(&devtree_lock, flags); |
28d0e36b | 219 | pp = __of_find_property(np, name, lenp); |
d6d3c4e6 | 220 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
581b605a SR |
221 | |
222 | return pp; | |
223 | } | |
224 | EXPORT_SYMBOL(of_find_property); | |
225 | ||
5063e25a GL |
226 | struct device_node *__of_find_all_nodes(struct device_node *prev) |
227 | { | |
228 | struct device_node *np; | |
229 | if (!prev) { | |
230 | np = of_root; | |
231 | } else if (prev->child) { | |
232 | np = prev->child; | |
233 | } else { | |
234 | /* Walk back up looking for a sibling, or the end of the structure */ | |
235 | np = prev; | |
236 | while (np->parent && !np->sibling) | |
237 | np = np->parent; | |
238 | np = np->sibling; /* Might be null at the end of the tree */ | |
239 | } | |
240 | return np; | |
241 | } | |
242 | ||
e91edcf5 GL |
243 | /** |
244 | * of_find_all_nodes - Get next node in global list | |
245 | * @prev: Previous node or NULL to start iteration | |
246 | * of_node_put() will be called on it | |
247 | * | |
8c8239c2 | 248 | * Return: A node pointer with refcount incremented, use |
e91edcf5 GL |
249 | * of_node_put() on it when done. |
250 | */ | |
251 | struct device_node *of_find_all_nodes(struct device_node *prev) | |
252 | { | |
253 | struct device_node *np; | |
d25d8694 | 254 | unsigned long flags; |
e91edcf5 | 255 | |
d25d8694 | 256 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a GL |
257 | np = __of_find_all_nodes(prev); |
258 | of_node_get(np); | |
e91edcf5 | 259 | of_node_put(prev); |
d25d8694 | 260 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
e91edcf5 GL |
261 | return np; |
262 | } | |
263 | EXPORT_SYMBOL(of_find_all_nodes); | |
264 | ||
28d0e36b TG |
265 | /* |
266 | * Find a property with a given name for a given node | |
267 | * and return the value. | |
268 | */ | |
a25095d4 GL |
269 | const void *__of_get_property(const struct device_node *np, |
270 | const char *name, int *lenp) | |
28d0e36b TG |
271 | { |
272 | struct property *pp = __of_find_property(np, name, lenp); | |
273 | ||
274 | return pp ? pp->value : NULL; | |
275 | } | |
276 | ||
97e873e5 SR |
277 | /* |
278 | * Find a property with a given name for a given node | |
279 | * and return the value. | |
280 | */ | |
281 | const void *of_get_property(const struct device_node *np, const char *name, | |
28d0e36b | 282 | int *lenp) |
97e873e5 SR |
283 | { |
284 | struct property *pp = of_find_property(np, name, lenp); | |
285 | ||
286 | return pp ? pp->value : NULL; | |
287 | } | |
288 | EXPORT_SYMBOL(of_get_property); | |
0081cbc3 | 289 | |
183912d3 SH |
290 | /* |
291 | * arch_match_cpu_phys_id - Match the given logical CPU and physical id | |
292 | * | |
293 | * @cpu: logical cpu index of a core/thread | |
294 | * @phys_id: physical identifier of a core/thread | |
295 | * | |
296 | * CPU logical to physical index mapping is architecture specific. | |
297 | * However this __weak function provides a default match of physical | |
298 | * id to logical cpu index. phys_id provided here is usually values read | |
299 | * from the device tree which must match the hardware internal registers. | |
300 | * | |
301 | * Returns true if the physical identifier and the logical cpu index | |
302 | * correspond to the same core/thread, false otherwise. | |
303 | */ | |
304 | bool __weak arch_match_cpu_phys_id(int cpu, u64 phys_id) | |
305 | { | |
306 | return (u32)phys_id == cpu; | |
307 | } | |
308 | ||
3637d49e | 309 | /* |
183912d3 SH |
310 | * Checks if the given "prop_name" property holds the physical id of the |
311 | * core/thread corresponding to the logical cpu 'cpu'. If 'thread' is not | |
312 | * NULL, local thread number within the core is returned in it. | |
313 | */ | |
314 | static bool __of_find_n_match_cpu_property(struct device_node *cpun, | |
315 | const char *prop_name, int cpu, unsigned int *thread) | |
316 | { | |
317 | const __be32 *cell; | |
318 | int ac, prop_len, tid; | |
319 | u64 hwid; | |
320 | ||
321 | ac = of_n_addr_cells(cpun); | |
322 | cell = of_get_property(cpun, prop_name, &prop_len); | |
6487c15f RH |
323 | if (!cell && !ac && arch_match_cpu_phys_id(cpu, 0)) |
324 | return true; | |
f3cea45a | 325 | if (!cell || !ac) |
183912d3 | 326 | return false; |
f3cea45a | 327 | prop_len /= sizeof(*cell) * ac; |
183912d3 SH |
328 | for (tid = 0; tid < prop_len; tid++) { |
329 | hwid = of_read_number(cell, ac); | |
330 | if (arch_match_cpu_phys_id(cpu, hwid)) { | |
331 | if (thread) | |
332 | *thread = tid; | |
333 | return true; | |
334 | } | |
335 | cell += ac; | |
336 | } | |
337 | return false; | |
338 | } | |
339 | ||
d1cb9d1a DM |
340 | /* |
341 | * arch_find_n_match_cpu_physical_id - See if the given device node is | |
342 | * for the cpu corresponding to logical cpu 'cpu'. Return true if so, | |
343 | * else false. If 'thread' is non-NULL, the local thread number within the | |
344 | * core is returned in it. | |
345 | */ | |
346 | bool __weak arch_find_n_match_cpu_physical_id(struct device_node *cpun, | |
347 | int cpu, unsigned int *thread) | |
348 | { | |
349 | /* Check for non-standard "ibm,ppc-interrupt-server#s" property | |
350 | * for thread ids on PowerPC. If it doesn't exist fallback to | |
351 | * standard "reg" property. | |
352 | */ | |
353 | if (IS_ENABLED(CONFIG_PPC) && | |
354 | __of_find_n_match_cpu_property(cpun, | |
355 | "ibm,ppc-interrupt-server#s", | |
356 | cpu, thread)) | |
357 | return true; | |
358 | ||
510bd068 | 359 | return __of_find_n_match_cpu_property(cpun, "reg", cpu, thread); |
d1cb9d1a DM |
360 | } |
361 | ||
183912d3 SH |
362 | /** |
363 | * of_get_cpu_node - Get device node associated with the given logical CPU | |
364 | * | |
365 | * @cpu: CPU number(logical index) for which device node is required | |
366 | * @thread: if not NULL, local thread number within the physical core is | |
367 | * returned | |
368 | * | |
369 | * The main purpose of this function is to retrieve the device node for the | |
370 | * given logical CPU index. It should be used to initialize the of_node in | |
371 | * cpu device. Once of_node in cpu device is populated, all the further | |
372 | * references can use that instead. | |
373 | * | |
374 | * CPU logical to physical index mapping is architecture specific and is built | |
375 | * before booting secondary cores. This function uses arch_match_cpu_phys_id | |
376 | * which can be overridden by architecture specific implementation. | |
377 | * | |
8c8239c2 | 378 | * Return: A node pointer for the logical cpu with refcount incremented, use |
1c986e36 | 379 | * of_node_put() on it when done. Returns NULL if not found. |
183912d3 SH |
380 | */ |
381 | struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) | |
382 | { | |
d1cb9d1a | 383 | struct device_node *cpun; |
183912d3 | 384 | |
651d44f9 | 385 | for_each_of_cpu_node(cpun) { |
d1cb9d1a | 386 | if (arch_find_n_match_cpu_physical_id(cpun, cpu, thread)) |
183912d3 SH |
387 | return cpun; |
388 | } | |
389 | return NULL; | |
390 | } | |
391 | EXPORT_SYMBOL(of_get_cpu_node); | |
392 | ||
a0e71cd9 SP |
393 | /** |
394 | * of_cpu_node_to_id: Get the logical CPU number for a given device_node | |
395 | * | |
396 | * @cpu_node: Pointer to the device_node for CPU. | |
397 | * | |
8c8239c2 RH |
398 | * Return: The logical CPU number of the given CPU device_node or -ENODEV if the |
399 | * CPU is not found. | |
a0e71cd9 SP |
400 | */ |
401 | int of_cpu_node_to_id(struct device_node *cpu_node) | |
402 | { | |
403 | int cpu; | |
404 | bool found = false; | |
405 | struct device_node *np; | |
406 | ||
407 | for_each_possible_cpu(cpu) { | |
408 | np = of_cpu_device_node_get(cpu); | |
409 | found = (cpu_node == np); | |
410 | of_node_put(np); | |
411 | if (found) | |
412 | return cpu; | |
413 | } | |
414 | ||
415 | return -ENODEV; | |
416 | } | |
417 | EXPORT_SYMBOL(of_cpu_node_to_id); | |
418 | ||
b9f8c26a UH |
419 | /** |
420 | * of_get_cpu_state_node - Get CPU's idle state node at the given index | |
421 | * | |
422 | * @cpu_node: The device node for the CPU | |
423 | * @index: The index in the list of the idle states | |
424 | * | |
425 | * Two generic methods can be used to describe a CPU's idle states, either via | |
426 | * a flattened description through the "cpu-idle-states" binding or via the | |
427 | * hierarchical layout, using the "power-domains" and the "domain-idle-states" | |
428 | * bindings. This function check for both and returns the idle state node for | |
429 | * the requested index. | |
430 | * | |
8c8239c2 | 431 | * Return: An idle state node if found at @index. The refcount is incremented |
b9f8c26a UH |
432 | * for it, so call of_node_put() on it when done. Returns NULL if not found. |
433 | */ | |
434 | struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, | |
435 | int index) | |
436 | { | |
437 | struct of_phandle_args args; | |
438 | int err; | |
439 | ||
440 | err = of_parse_phandle_with_args(cpu_node, "power-domains", | |
441 | "#power-domain-cells", 0, &args); | |
442 | if (!err) { | |
443 | struct device_node *state_node = | |
444 | of_parse_phandle(args.np, "domain-idle-states", index); | |
445 | ||
446 | of_node_put(args.np); | |
447 | if (state_node) | |
448 | return state_node; | |
449 | } | |
450 | ||
451 | return of_parse_phandle(cpu_node, "cpu-idle-states", index); | |
452 | } | |
453 | EXPORT_SYMBOL(of_get_cpu_state_node); | |
454 | ||
215a14cf KH |
455 | /** |
456 | * __of_device_is_compatible() - Check if the node matches given constraints | |
457 | * @device: pointer to node | |
458 | * @compat: required compatible string, NULL or "" for any match | |
459 | * @type: required device_type value, NULL or "" for any match | |
460 | * @name: required node name, NULL or "" for any match | |
461 | * | |
462 | * Checks if the given @compat, @type and @name strings match the | |
463 | * properties of the given @device. A constraints can be skipped by | |
464 | * passing NULL or an empty string as the constraint. | |
465 | * | |
466 | * Returns 0 for no match, and a positive integer on match. The return | |
467 | * value is a relative score with larger values indicating better | |
468 | * matches. The score is weighted for the most specific compatible value | |
469 | * to get the highest score. Matching type is next, followed by matching | |
470 | * name. Practically speaking, this results in the following priority | |
471 | * order for matches: | |
472 | * | |
473 | * 1. specific compatible && type && name | |
474 | * 2. specific compatible && type | |
475 | * 3. specific compatible && name | |
476 | * 4. specific compatible | |
477 | * 5. general compatible && type && name | |
478 | * 6. general compatible && type | |
479 | * 7. general compatible && name | |
480 | * 8. general compatible | |
481 | * 9. type && name | |
482 | * 10. type | |
483 | * 11. name | |
0081cbc3 | 484 | */ |
28d0e36b | 485 | static int __of_device_is_compatible(const struct device_node *device, |
215a14cf KH |
486 | const char *compat, const char *type, const char *name) |
487 | { | |
488 | struct property *prop; | |
489 | const char *cp; | |
490 | int index = 0, score = 0; | |
491 | ||
492 | /* Compatible match has highest priority */ | |
493 | if (compat && compat[0]) { | |
494 | prop = __of_find_property(device, "compatible", NULL); | |
495 | for (cp = of_prop_next_string(prop, NULL); cp; | |
496 | cp = of_prop_next_string(prop, cp), index++) { | |
497 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) { | |
498 | score = INT_MAX/2 - (index << 2); | |
499 | break; | |
500 | } | |
501 | } | |
502 | if (!score) | |
503 | return 0; | |
504 | } | |
0081cbc3 | 505 | |
215a14cf KH |
506 | /* Matching type is better than matching name */ |
507 | if (type && type[0]) { | |
e8b1dee2 | 508 | if (!__of_node_is_type(device, type)) |
215a14cf KH |
509 | return 0; |
510 | score += 2; | |
0081cbc3 SR |
511 | } |
512 | ||
215a14cf KH |
513 | /* Matching name is a bit better than not */ |
514 | if (name && name[0]) { | |
b3e46d1a | 515 | if (!of_node_name_eq(device, name)) |
215a14cf KH |
516 | return 0; |
517 | score++; | |
518 | } | |
519 | ||
520 | return score; | |
0081cbc3 | 521 | } |
28d0e36b TG |
522 | |
523 | /** Checks if the given "compat" string matches one of the strings in | |
524 | * the device's "compatible" property | |
525 | */ | |
526 | int of_device_is_compatible(const struct device_node *device, | |
527 | const char *compat) | |
528 | { | |
d6d3c4e6 | 529 | unsigned long flags; |
28d0e36b TG |
530 | int res; |
531 | ||
d6d3c4e6 | 532 | raw_spin_lock_irqsave(&devtree_lock, flags); |
215a14cf | 533 | res = __of_device_is_compatible(device, compat, NULL, NULL); |
d6d3c4e6 | 534 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
28d0e36b TG |
535 | return res; |
536 | } | |
0081cbc3 | 537 | EXPORT_SYMBOL(of_device_is_compatible); |
e679c5f4 | 538 | |
b9c13fe3 BH |
539 | /** Checks if the device is compatible with any of the entries in |
540 | * a NULL terminated array of strings. Returns the best match | |
541 | * score or 0. | |
542 | */ | |
543 | int of_device_compatible_match(struct device_node *device, | |
544 | const char *const *compat) | |
545 | { | |
546 | unsigned int tmp, score = 0; | |
547 | ||
548 | if (!compat) | |
549 | return 0; | |
550 | ||
551 | while (*compat) { | |
552 | tmp = of_device_is_compatible(device, *compat); | |
553 | if (tmp > score) | |
554 | score = tmp; | |
555 | compat++; | |
556 | } | |
557 | ||
558 | return score; | |
559 | } | |
560 | ||
1f43cfb9 | 561 | /** |
71a157e8 | 562 | * of_machine_is_compatible - Test root of device tree for a given compatible value |
1f43cfb9 GL |
563 | * @compat: compatible string to look for in root node's compatible property. |
564 | * | |
8c8239c2 | 565 | * Return: A positive integer if the root node has the given value in its |
1f43cfb9 GL |
566 | * compatible property. |
567 | */ | |
71a157e8 | 568 | int of_machine_is_compatible(const char *compat) |
1f43cfb9 GL |
569 | { |
570 | struct device_node *root; | |
571 | int rc = 0; | |
572 | ||
573 | root = of_find_node_by_path("/"); | |
574 | if (root) { | |
575 | rc = of_device_is_compatible(root, compat); | |
576 | of_node_put(root); | |
577 | } | |
578 | return rc; | |
579 | } | |
71a157e8 | 580 | EXPORT_SYMBOL(of_machine_is_compatible); |
1f43cfb9 | 581 | |
834d97d4 | 582 | /** |
c31a0c05 | 583 | * __of_device_is_available - check if a device is available for use |
834d97d4 | 584 | * |
c31a0c05 | 585 | * @device: Node to check for availability, with locks already held |
834d97d4 | 586 | * |
8c8239c2 | 587 | * Return: True if the status property is absent or set to "okay" or "ok", |
53a4ab96 | 588 | * false otherwise |
834d97d4 | 589 | */ |
53a4ab96 | 590 | static bool __of_device_is_available(const struct device_node *device) |
834d97d4 JB |
591 | { |
592 | const char *status; | |
593 | int statlen; | |
594 | ||
42ccd781 | 595 | if (!device) |
53a4ab96 | 596 | return false; |
42ccd781 | 597 | |
c31a0c05 | 598 | status = __of_get_property(device, "status", &statlen); |
834d97d4 | 599 | if (status == NULL) |
53a4ab96 | 600 | return true; |
834d97d4 JB |
601 | |
602 | if (statlen > 0) { | |
603 | if (!strcmp(status, "okay") || !strcmp(status, "ok")) | |
53a4ab96 | 604 | return true; |
834d97d4 JB |
605 | } |
606 | ||
53a4ab96 | 607 | return false; |
834d97d4 | 608 | } |
c31a0c05 SW |
609 | |
610 | /** | |
611 | * of_device_is_available - check if a device is available for use | |
612 | * | |
613 | * @device: Node to check for availability | |
614 | * | |
8c8239c2 | 615 | * Return: True if the status property is absent or set to "okay" or "ok", |
53a4ab96 | 616 | * false otherwise |
c31a0c05 | 617 | */ |
53a4ab96 | 618 | bool of_device_is_available(const struct device_node *device) |
c31a0c05 SW |
619 | { |
620 | unsigned long flags; | |
53a4ab96 | 621 | bool res; |
c31a0c05 SW |
622 | |
623 | raw_spin_lock_irqsave(&devtree_lock, flags); | |
624 | res = __of_device_is_available(device); | |
625 | raw_spin_unlock_irqrestore(&devtree_lock, flags); | |
626 | return res; | |
627 | ||
628 | } | |
834d97d4 JB |
629 | EXPORT_SYMBOL(of_device_is_available); |
630 | ||
37786c7f KC |
631 | /** |
632 | * of_device_is_big_endian - check if a device has BE registers | |
633 | * | |
634 | * @device: Node to check for endianness | |
635 | * | |
8c8239c2 | 636 | * Return: True if the device has a "big-endian" property, or if the kernel |
37786c7f KC |
637 | * was compiled for BE *and* the device has a "native-endian" property. |
638 | * Returns false otherwise. | |
639 | * | |
640 | * Callers would nominally use ioread32be/iowrite32be if | |
641 | * of_device_is_big_endian() == true, or readl/writel otherwise. | |
642 | */ | |
643 | bool of_device_is_big_endian(const struct device_node *device) | |
644 | { | |
645 | if (of_property_read_bool(device, "big-endian")) | |
646 | return true; | |
647 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && | |
648 | of_property_read_bool(device, "native-endian")) | |
649 | return true; | |
650 | return false; | |
651 | } | |
652 | EXPORT_SYMBOL(of_device_is_big_endian); | |
653 | ||
e679c5f4 | 654 | /** |
62f026f0 RH |
655 | * of_get_parent - Get a node's parent if any |
656 | * @node: Node to get parent | |
e679c5f4 | 657 | * |
62f026f0 RH |
658 | * Return: A node pointer with refcount incremented, use |
659 | * of_node_put() on it when done. | |
e679c5f4 SR |
660 | */ |
661 | struct device_node *of_get_parent(const struct device_node *node) | |
662 | { | |
663 | struct device_node *np; | |
d6d3c4e6 | 664 | unsigned long flags; |
e679c5f4 SR |
665 | |
666 | if (!node) | |
667 | return NULL; | |
668 | ||
d6d3c4e6 | 669 | raw_spin_lock_irqsave(&devtree_lock, flags); |
e679c5f4 | 670 | np = of_node_get(node->parent); |
d6d3c4e6 | 671 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
e679c5f4 SR |
672 | return np; |
673 | } | |
674 | EXPORT_SYMBOL(of_get_parent); | |
d1cd355a | 675 | |
f4eb0107 | 676 | /** |
62f026f0 RH |
677 | * of_get_next_parent - Iterate to a node's parent |
678 | * @node: Node to get parent of | |
f4eb0107 | 679 | * |
62f026f0 RH |
680 | * This is like of_get_parent() except that it drops the |
681 | * refcount on the passed node, making it suitable for iterating | |
682 | * through a node's parents. | |
f4eb0107 | 683 | * |
62f026f0 RH |
684 | * Return: A node pointer with refcount incremented, use |
685 | * of_node_put() on it when done. | |
f4eb0107 ME |
686 | */ |
687 | struct device_node *of_get_next_parent(struct device_node *node) | |
688 | { | |
689 | struct device_node *parent; | |
d6d3c4e6 | 690 | unsigned long flags; |
f4eb0107 ME |
691 | |
692 | if (!node) | |
693 | return NULL; | |
694 | ||
d6d3c4e6 | 695 | raw_spin_lock_irqsave(&devtree_lock, flags); |
f4eb0107 ME |
696 | parent = of_node_get(node->parent); |
697 | of_node_put(node); | |
d6d3c4e6 | 698 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
f4eb0107 ME |
699 | return parent; |
700 | } | |
6695be68 | 701 | EXPORT_SYMBOL(of_get_next_parent); |
f4eb0107 | 702 | |
0d0e02d6 GL |
703 | static struct device_node *__of_get_next_child(const struct device_node *node, |
704 | struct device_node *prev) | |
705 | { | |
706 | struct device_node *next; | |
707 | ||
43cb4367 FF |
708 | if (!node) |
709 | return NULL; | |
710 | ||
0d0e02d6 | 711 | next = prev ? prev->sibling : node->child; |
ace1c4b5 | 712 | of_node_get(next); |
0d0e02d6 GL |
713 | of_node_put(prev); |
714 | return next; | |
715 | } | |
716 | #define __for_each_child_of_node(parent, child) \ | |
717 | for (child = __of_get_next_child(parent, NULL); child != NULL; \ | |
718 | child = __of_get_next_child(parent, child)) | |
719 | ||
d1cd355a | 720 | /** |
62f026f0 RH |
721 | * of_get_next_child - Iterate a node childs |
722 | * @node: parent node | |
723 | * @prev: previous child of the parent node, or NULL to get first | |
d1cd355a | 724 | * |
62f026f0 RH |
725 | * Return: A node pointer with refcount incremented, use of_node_put() on |
726 | * it when done. Returns NULL when prev is the last child. Decrements the | |
727 | * refcount of prev. | |
d1cd355a SR |
728 | */ |
729 | struct device_node *of_get_next_child(const struct device_node *node, | |
730 | struct device_node *prev) | |
731 | { | |
732 | struct device_node *next; | |
d6d3c4e6 | 733 | unsigned long flags; |
d1cd355a | 734 | |
d6d3c4e6 | 735 | raw_spin_lock_irqsave(&devtree_lock, flags); |
0d0e02d6 | 736 | next = __of_get_next_child(node, prev); |
d6d3c4e6 | 737 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
d1cd355a SR |
738 | return next; |
739 | } | |
740 | EXPORT_SYMBOL(of_get_next_child); | |
1ef4d424 | 741 | |
3296193d | 742 | /** |
62f026f0 RH |
743 | * of_get_next_available_child - Find the next available child node |
744 | * @node: parent node | |
745 | * @prev: previous child of the parent node, or NULL to get first | |
3296193d | 746 | * |
62f026f0 RH |
747 | * This function is like of_get_next_child(), except that it |
748 | * automatically skips any disabled nodes (i.e. status = "disabled"). | |
3296193d TT |
749 | */ |
750 | struct device_node *of_get_next_available_child(const struct device_node *node, | |
751 | struct device_node *prev) | |
752 | { | |
753 | struct device_node *next; | |
d25d8694 | 754 | unsigned long flags; |
3296193d | 755 | |
43cb4367 FF |
756 | if (!node) |
757 | return NULL; | |
758 | ||
d25d8694 | 759 | raw_spin_lock_irqsave(&devtree_lock, flags); |
3296193d TT |
760 | next = prev ? prev->sibling : node->child; |
761 | for (; next; next = next->sibling) { | |
c31a0c05 | 762 | if (!__of_device_is_available(next)) |
3296193d TT |
763 | continue; |
764 | if (of_node_get(next)) | |
765 | break; | |
766 | } | |
767 | of_node_put(prev); | |
d25d8694 | 768 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
3296193d TT |
769 | return next; |
770 | } | |
771 | EXPORT_SYMBOL(of_get_next_available_child); | |
772 | ||
f1f207e4 | 773 | /** |
62f026f0 RH |
774 | * of_get_next_cpu_node - Iterate on cpu nodes |
775 | * @prev: previous child of the /cpus node, or NULL to get first | |
f1f207e4 | 776 | * |
62f026f0 RH |
777 | * Return: A cpu node pointer with refcount incremented, use of_node_put() |
778 | * on it when done. Returns NULL when prev is the last child. Decrements | |
779 | * the refcount of prev. | |
f1f207e4 RH |
780 | */ |
781 | struct device_node *of_get_next_cpu_node(struct device_node *prev) | |
782 | { | |
783 | struct device_node *next = NULL; | |
784 | unsigned long flags; | |
785 | struct device_node *node; | |
786 | ||
787 | if (!prev) | |
788 | node = of_find_node_by_path("/cpus"); | |
789 | ||
790 | raw_spin_lock_irqsave(&devtree_lock, flags); | |
791 | if (prev) | |
792 | next = prev->sibling; | |
793 | else if (node) { | |
794 | next = node->child; | |
795 | of_node_put(node); | |
796 | } | |
797 | for (; next; next = next->sibling) { | |
798 | if (!(of_node_name_eq(next, "cpu") || | |
e8b1dee2 | 799 | __of_node_is_type(next, "cpu"))) |
f1f207e4 | 800 | continue; |
f1f207e4 RH |
801 | if (of_node_get(next)) |
802 | break; | |
803 | } | |
804 | of_node_put(prev); | |
805 | raw_spin_unlock_irqrestore(&devtree_lock, flags); | |
806 | return next; | |
807 | } | |
808 | EXPORT_SYMBOL(of_get_next_cpu_node); | |
809 | ||
36156f92 JH |
810 | /** |
811 | * of_get_compatible_child - Find compatible child node | |
812 | * @parent: parent node | |
813 | * @compatible: compatible string | |
814 | * | |
815 | * Lookup child node whose compatible property contains the given compatible | |
816 | * string. | |
817 | * | |
8c8239c2 | 818 | * Return: a node pointer with refcount incremented, use of_node_put() on it |
36156f92 JH |
819 | * when done; or NULL if not found. |
820 | */ | |
821 | struct device_node *of_get_compatible_child(const struct device_node *parent, | |
822 | const char *compatible) | |
823 | { | |
824 | struct device_node *child; | |
825 | ||
826 | for_each_child_of_node(parent, child) { | |
827 | if (of_device_is_compatible(child, compatible)) | |
828 | break; | |
829 | } | |
830 | ||
831 | return child; | |
832 | } | |
833 | EXPORT_SYMBOL(of_get_compatible_child); | |
834 | ||
9c19761a | 835 | /** |
62f026f0 RH |
836 | * of_get_child_by_name - Find the child node by name for a given parent |
837 | * @node: parent node | |
838 | * @name: child name to look for. | |
9c19761a | 839 | * |
62f026f0 | 840 | * This function looks for child node for given matching name |
9c19761a | 841 | * |
62f026f0 RH |
842 | * Return: A node pointer if found, with refcount incremented, use |
843 | * of_node_put() on it when done. | |
844 | * Returns NULL if node is not found. | |
9c19761a SK |
845 | */ |
846 | struct device_node *of_get_child_by_name(const struct device_node *node, | |
847 | const char *name) | |
848 | { | |
849 | struct device_node *child; | |
850 | ||
851 | for_each_child_of_node(node, child) | |
b3e46d1a | 852 | if (of_node_name_eq(child, name)) |
9c19761a SK |
853 | break; |
854 | return child; | |
855 | } | |
856 | EXPORT_SYMBOL(of_get_child_by_name); | |
857 | ||
e0a58f3e | 858 | struct device_node *__of_find_node_by_path(struct device_node *parent, |
c22e650e GL |
859 | const char *path) |
860 | { | |
861 | struct device_node *child; | |
106937e8 | 862 | int len; |
c22e650e | 863 | |
721a09e9 | 864 | len = strcspn(path, "/:"); |
c22e650e GL |
865 | if (!len) |
866 | return NULL; | |
867 | ||
868 | __for_each_child_of_node(parent, child) { | |
95e6b1fa | 869 | const char *name = kbasename(child->full_name); |
c22e650e GL |
870 | if (strncmp(path, name, len) == 0 && (strlen(name) == len)) |
871 | return child; | |
872 | } | |
873 | return NULL; | |
874 | } | |
875 | ||
27497e11 RH |
876 | struct device_node *__of_find_node_by_full_path(struct device_node *node, |
877 | const char *path) | |
878 | { | |
879 | const char *separator = strchr(path, ':'); | |
880 | ||
881 | while (node && *path == '/') { | |
882 | struct device_node *tmp = node; | |
883 | ||
884 | path++; /* Increment past '/' delimiter */ | |
885 | node = __of_find_node_by_path(node, path); | |
886 | of_node_put(tmp); | |
887 | path = strchrnul(path, '/'); | |
888 | if (separator && separator < path) | |
889 | break; | |
890 | } | |
891 | return node; | |
892 | } | |
893 | ||
1ef4d424 | 894 | /** |
62f026f0 RH |
895 | * of_find_node_opts_by_path - Find a node matching a full OF path |
896 | * @path: Either the full path to match, or if the path does not | |
897 | * start with '/', the name of a property of the /aliases | |
898 | * node (an alias). In the case of an alias, the node | |
899 | * matching the alias' value will be returned. | |
900 | * @opts: Address of a pointer into which to store the start of | |
901 | * an options string appended to the end of the path with | |
902 | * a ':' separator. | |
903 | * | |
904 | * Valid paths: | |
905 | * * /foo/bar Full path | |
906 | * * foo Valid alias | |
907 | * * foo/bar Valid alias + relative path | |
908 | * | |
909 | * Return: A node pointer with refcount incremented, use | |
910 | * of_node_put() on it when done. | |
1ef4d424 | 911 | */ |
75c28c09 | 912 | struct device_node *of_find_node_opts_by_path(const char *path, const char **opts) |
1ef4d424 | 913 | { |
c22e650e GL |
914 | struct device_node *np = NULL; |
915 | struct property *pp; | |
d6d3c4e6 | 916 | unsigned long flags; |
75c28c09 LL |
917 | const char *separator = strchr(path, ':'); |
918 | ||
919 | if (opts) | |
920 | *opts = separator ? separator + 1 : NULL; | |
1ef4d424 | 921 | |
c22e650e | 922 | if (strcmp(path, "/") == 0) |
5063e25a | 923 | return of_node_get(of_root); |
c22e650e GL |
924 | |
925 | /* The path could begin with an alias */ | |
926 | if (*path != '/') { | |
106937e8 LL |
927 | int len; |
928 | const char *p = separator; | |
929 | ||
930 | if (!p) | |
931 | p = strchrnul(path, '/'); | |
932 | len = p - path; | |
c22e650e GL |
933 | |
934 | /* of_aliases must not be NULL */ | |
935 | if (!of_aliases) | |
936 | return NULL; | |
937 | ||
938 | for_each_property_of_node(of_aliases, pp) { | |
939 | if (strlen(pp->name) == len && !strncmp(pp->name, path, len)) { | |
940 | np = of_find_node_by_path(pp->value); | |
941 | break; | |
942 | } | |
943 | } | |
944 | if (!np) | |
945 | return NULL; | |
946 | path = p; | |
947 | } | |
948 | ||
949 | /* Step down the tree matching path components */ | |
d6d3c4e6 | 950 | raw_spin_lock_irqsave(&devtree_lock, flags); |
c22e650e | 951 | if (!np) |
5063e25a | 952 | np = of_node_get(of_root); |
27497e11 | 953 | np = __of_find_node_by_full_path(np, path); |
d6d3c4e6 | 954 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
955 | return np; |
956 | } | |
75c28c09 | 957 | EXPORT_SYMBOL(of_find_node_opts_by_path); |
1ef4d424 SR |
958 | |
959 | /** | |
62f026f0 RH |
960 | * of_find_node_by_name - Find a node by its "name" property |
961 | * @from: The node to start searching from or NULL; the node | |
1ef4d424 | 962 | * you pass will not be searched, only the next one |
02a876b5 SB |
963 | * will. Typically, you pass what the previous call |
964 | * returned. of_node_put() will be called on @from. | |
62f026f0 | 965 | * @name: The name string to match against |
1ef4d424 | 966 | * |
62f026f0 RH |
967 | * Return: A node pointer with refcount incremented, use |
968 | * of_node_put() on it when done. | |
1ef4d424 SR |
969 | */ |
970 | struct device_node *of_find_node_by_name(struct device_node *from, | |
971 | const char *name) | |
972 | { | |
973 | struct device_node *np; | |
d6d3c4e6 | 974 | unsigned long flags; |
1ef4d424 | 975 | |
d6d3c4e6 | 976 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 977 | for_each_of_allnodes_from(from, np) |
b3e46d1a | 978 | if (of_node_name_eq(np, name) && of_node_get(np)) |
1ef4d424 SR |
979 | break; |
980 | of_node_put(from); | |
d6d3c4e6 | 981 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
982 | return np; |
983 | } | |
984 | EXPORT_SYMBOL(of_find_node_by_name); | |
985 | ||
986 | /** | |
62f026f0 RH |
987 | * of_find_node_by_type - Find a node by its "device_type" property |
988 | * @from: The node to start searching from, or NULL to start searching | |
1ef4d424 SR |
989 | * the entire device tree. The node you pass will not be |
990 | * searched, only the next one will; typically, you pass | |
991 | * what the previous call returned. of_node_put() will be | |
992 | * called on from for you. | |
62f026f0 | 993 | * @type: The type string to match against |
1ef4d424 | 994 | * |
62f026f0 RH |
995 | * Return: A node pointer with refcount incremented, use |
996 | * of_node_put() on it when done. | |
1ef4d424 SR |
997 | */ |
998 | struct device_node *of_find_node_by_type(struct device_node *from, | |
999 | const char *type) | |
1000 | { | |
1001 | struct device_node *np; | |
d6d3c4e6 | 1002 | unsigned long flags; |
1ef4d424 | 1003 | |
d6d3c4e6 | 1004 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 1005 | for_each_of_allnodes_from(from, np) |
e8b1dee2 | 1006 | if (__of_node_is_type(np, type) && of_node_get(np)) |
1ef4d424 SR |
1007 | break; |
1008 | of_node_put(from); | |
d6d3c4e6 | 1009 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
1010 | return np; |
1011 | } | |
1012 | EXPORT_SYMBOL(of_find_node_by_type); | |
1013 | ||
1014 | /** | |
62f026f0 | 1015 | * of_find_compatible_node - Find a node based on type and one of the |
1ef4d424 | 1016 | * tokens in its "compatible" property |
62f026f0 RH |
1017 | * @from: The node to start searching from or NULL, the node |
1018 | * you pass will not be searched, only the next one | |
1019 | * will; typically, you pass what the previous call | |
1020 | * returned. of_node_put() will be called on it | |
1021 | * @type: The type string to match "device_type" or NULL to ignore | |
1022 | * @compatible: The string to match to one of the tokens in the device | |
1023 | * "compatible" list. | |
1024 | * | |
1025 | * Return: A node pointer with refcount incremented, use | |
1026 | * of_node_put() on it when done. | |
1ef4d424 SR |
1027 | */ |
1028 | struct device_node *of_find_compatible_node(struct device_node *from, | |
1029 | const char *type, const char *compatible) | |
1030 | { | |
1031 | struct device_node *np; | |
d6d3c4e6 | 1032 | unsigned long flags; |
1ef4d424 | 1033 | |
d6d3c4e6 | 1034 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 1035 | for_each_of_allnodes_from(from, np) |
215a14cf | 1036 | if (__of_device_is_compatible(np, compatible, type, NULL) && |
28d0e36b | 1037 | of_node_get(np)) |
1ef4d424 | 1038 | break; |
1ef4d424 | 1039 | of_node_put(from); |
d6d3c4e6 | 1040 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1ef4d424 SR |
1041 | return np; |
1042 | } | |
1043 | EXPORT_SYMBOL(of_find_compatible_node); | |
283029d1 | 1044 | |
1e291b14 | 1045 | /** |
62f026f0 RH |
1046 | * of_find_node_with_property - Find a node which has a property with |
1047 | * the given name. | |
1048 | * @from: The node to start searching from or NULL, the node | |
1049 | * you pass will not be searched, only the next one | |
1050 | * will; typically, you pass what the previous call | |
1051 | * returned. of_node_put() will be called on it | |
1052 | * @prop_name: The name of the property to look for. | |
1053 | * | |
1054 | * Return: A node pointer with refcount incremented, use | |
1055 | * of_node_put() on it when done. | |
1e291b14 ME |
1056 | */ |
1057 | struct device_node *of_find_node_with_property(struct device_node *from, | |
1058 | const char *prop_name) | |
1059 | { | |
1060 | struct device_node *np; | |
1061 | struct property *pp; | |
d6d3c4e6 | 1062 | unsigned long flags; |
1e291b14 | 1063 | |
d6d3c4e6 | 1064 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 1065 | for_each_of_allnodes_from(from, np) { |
a3a7cab1 | 1066 | for (pp = np->properties; pp; pp = pp->next) { |
1e291b14 ME |
1067 | if (of_prop_cmp(pp->name, prop_name) == 0) { |
1068 | of_node_get(np); | |
1069 | goto out; | |
1070 | } | |
1071 | } | |
1072 | } | |
1073 | out: | |
1074 | of_node_put(from); | |
d6d3c4e6 | 1075 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
1e291b14 ME |
1076 | return np; |
1077 | } | |
1078 | EXPORT_SYMBOL(of_find_node_with_property); | |
1079 | ||
28d0e36b TG |
1080 | static |
1081 | const struct of_device_id *__of_match_node(const struct of_device_id *matches, | |
1082 | const struct device_node *node) | |
283029d1 | 1083 | { |
215a14cf KH |
1084 | const struct of_device_id *best_match = NULL; |
1085 | int score, best_score = 0; | |
1086 | ||
a52f07ec GL |
1087 | if (!matches) |
1088 | return NULL; | |
1089 | ||
215a14cf KH |
1090 | for (; matches->name[0] || matches->type[0] || matches->compatible[0]; matches++) { |
1091 | score = __of_device_is_compatible(node, matches->compatible, | |
1092 | matches->type, matches->name); | |
1093 | if (score > best_score) { | |
1094 | best_match = matches; | |
1095 | best_score = score; | |
1096 | } | |
4e8ca6ee | 1097 | } |
215a14cf KH |
1098 | |
1099 | return best_match; | |
283029d1 | 1100 | } |
28d0e36b TG |
1101 | |
1102 | /** | |
c50949d3 | 1103 | * of_match_node - Tell if a device_node has a matching of_match structure |
62f026f0 RH |
1104 | * @matches: array of of device match structures to search in |
1105 | * @node: the of device structure to match against | |
28d0e36b | 1106 | * |
62f026f0 | 1107 | * Low level utility function used by device matching. |
28d0e36b TG |
1108 | */ |
1109 | const struct of_device_id *of_match_node(const struct of_device_id *matches, | |
1110 | const struct device_node *node) | |
1111 | { | |
1112 | const struct of_device_id *match; | |
d6d3c4e6 | 1113 | unsigned long flags; |
28d0e36b | 1114 | |
d6d3c4e6 | 1115 | raw_spin_lock_irqsave(&devtree_lock, flags); |
28d0e36b | 1116 | match = __of_match_node(matches, node); |
d6d3c4e6 | 1117 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
28d0e36b TG |
1118 | return match; |
1119 | } | |
283029d1 GL |
1120 | EXPORT_SYMBOL(of_match_node); |
1121 | ||
1122 | /** | |
62f026f0 RH |
1123 | * of_find_matching_node_and_match - Find a node based on an of_device_id |
1124 | * match table. | |
1125 | * @from: The node to start searching from or NULL, the node | |
1126 | * you pass will not be searched, only the next one | |
1127 | * will; typically, you pass what the previous call | |
1128 | * returned. of_node_put() will be called on it | |
1129 | * @matches: array of of device match structures to search in | |
1130 | * @match: Updated to point at the matches entry which matched | |
1131 | * | |
1132 | * Return: A node pointer with refcount incremented, use | |
1133 | * of_node_put() on it when done. | |
283029d1 | 1134 | */ |
50c8af4c SW |
1135 | struct device_node *of_find_matching_node_and_match(struct device_node *from, |
1136 | const struct of_device_id *matches, | |
1137 | const struct of_device_id **match) | |
283029d1 GL |
1138 | { |
1139 | struct device_node *np; | |
dc71bcf1 | 1140 | const struct of_device_id *m; |
d6d3c4e6 | 1141 | unsigned long flags; |
283029d1 | 1142 | |
50c8af4c SW |
1143 | if (match) |
1144 | *match = NULL; | |
1145 | ||
d6d3c4e6 | 1146 | raw_spin_lock_irqsave(&devtree_lock, flags); |
5063e25a | 1147 | for_each_of_allnodes_from(from, np) { |
28d0e36b | 1148 | m = __of_match_node(matches, np); |
dc71bcf1 | 1149 | if (m && of_node_get(np)) { |
50c8af4c | 1150 | if (match) |
dc71bcf1 | 1151 | *match = m; |
283029d1 | 1152 | break; |
50c8af4c | 1153 | } |
283029d1 GL |
1154 | } |
1155 | of_node_put(from); | |
d6d3c4e6 | 1156 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
283029d1 GL |
1157 | return np; |
1158 | } | |
80c2022e | 1159 | EXPORT_SYMBOL(of_find_matching_node_and_match); |
3f07af49 | 1160 | |
3f07af49 GL |
1161 | /** |
1162 | * of_modalias_node - Lookup appropriate modalias for a device node | |
1163 | * @node: pointer to a device tree node | |
1164 | * @modalias: Pointer to buffer that modalias value will be copied into | |
1165 | * @len: Length of modalias value | |
1166 | * | |
2ffe8c5f GL |
1167 | * Based on the value of the compatible property, this routine will attempt |
1168 | * to choose an appropriate modalias value for a particular device tree node. | |
1169 | * It does this by stripping the manufacturer prefix (as delimited by a ',') | |
1170 | * from the first entry in the compatible list property. | |
3f07af49 | 1171 | * |
8c8239c2 | 1172 | * Return: This routine returns 0 on success, <0 on failure. |
3f07af49 GL |
1173 | */ |
1174 | int of_modalias_node(struct device_node *node, char *modalias, int len) | |
1175 | { | |
2ffe8c5f GL |
1176 | const char *compatible, *p; |
1177 | int cplen; | |
3f07af49 GL |
1178 | |
1179 | compatible = of_get_property(node, "compatible", &cplen); | |
2ffe8c5f | 1180 | if (!compatible || strlen(compatible) > cplen) |
3f07af49 | 1181 | return -ENODEV; |
3f07af49 | 1182 | p = strchr(compatible, ','); |
2ffe8c5f | 1183 | strlcpy(modalias, p ? p + 1 : compatible, len); |
3f07af49 GL |
1184 | return 0; |
1185 | } | |
1186 | EXPORT_SYMBOL_GPL(of_modalias_node); | |
1187 | ||
89751a7c JK |
1188 | /** |
1189 | * of_find_node_by_phandle - Find a node given a phandle | |
1190 | * @handle: phandle of the node to find | |
1191 | * | |
8c8239c2 | 1192 | * Return: A node pointer with refcount incremented, use |
89751a7c JK |
1193 | * of_node_put() on it when done. |
1194 | */ | |
1195 | struct device_node *of_find_node_by_phandle(phandle handle) | |
1196 | { | |
0b3ce78e | 1197 | struct device_node *np = NULL; |
d25d8694 | 1198 | unsigned long flags; |
90dc0d1c | 1199 | u32 handle_hash; |
89751a7c | 1200 | |
fc59b447 GL |
1201 | if (!handle) |
1202 | return NULL; | |
1203 | ||
90dc0d1c RH |
1204 | handle_hash = of_phandle_cache_hash(handle); |
1205 | ||
d25d8694 | 1206 | raw_spin_lock_irqsave(&devtree_lock, flags); |
0b3ce78e | 1207 | |
90dc0d1c RH |
1208 | if (phandle_cache[handle_hash] && |
1209 | handle == phandle_cache[handle_hash]->phandle) | |
1210 | np = phandle_cache[handle_hash]; | |
0b3ce78e FR |
1211 | |
1212 | if (!np) { | |
1213 | for_each_of_allnodes(np) | |
5801169a FR |
1214 | if (np->phandle == handle && |
1215 | !of_node_check_flag(np, OF_DETACHED)) { | |
90dc0d1c | 1216 | phandle_cache[handle_hash] = np; |
0b3ce78e FR |
1217 | break; |
1218 | } | |
1219 | } | |
1220 | ||
89751a7c | 1221 | of_node_get(np); |
d25d8694 | 1222 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
89751a7c JK |
1223 | return np; |
1224 | } | |
1225 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
1226 | ||
624cfca5 GL |
1227 | void of_print_phandle_args(const char *msg, const struct of_phandle_args *args) |
1228 | { | |
1229 | int i; | |
0d638a07 | 1230 | printk("%s %pOF", msg, args->np); |
4aa66344 MN |
1231 | for (i = 0; i < args->args_count; i++) { |
1232 | const char delim = i ? ',' : ':'; | |
1233 | ||
1234 | pr_cont("%c%08x", delim, args->args[i]); | |
1235 | } | |
1236 | pr_cont("\n"); | |
624cfca5 GL |
1237 | } |
1238 | ||
74e1fbb1 JR |
1239 | int of_phandle_iterator_init(struct of_phandle_iterator *it, |
1240 | const struct device_node *np, | |
1241 | const char *list_name, | |
1242 | const char *cells_name, | |
1243 | int cell_count) | |
64b60e09 | 1244 | { |
74e1fbb1 JR |
1245 | const __be32 *list; |
1246 | int size; | |
1247 | ||
1248 | memset(it, 0, sizeof(*it)); | |
64b60e09 | 1249 | |
59e9fcf8 UKK |
1250 | /* |
1251 | * one of cell_count or cells_name must be provided to determine the | |
1252 | * argument length. | |
1253 | */ | |
1254 | if (cell_count < 0 && !cells_name) | |
1255 | return -EINVAL; | |
1256 | ||
64b60e09 | 1257 | list = of_get_property(np, list_name, &size); |
15c9a0ac | 1258 | if (!list) |
1af4c7f1 | 1259 | return -ENOENT; |
64b60e09 | 1260 | |
74e1fbb1 JR |
1261 | it->cells_name = cells_name; |
1262 | it->cell_count = cell_count; | |
1263 | it->parent = np; | |
1264 | it->list_end = list + size / sizeof(*list); | |
1265 | it->phandle_end = list; | |
1266 | it->cur = list; | |
1267 | ||
1268 | return 0; | |
1269 | } | |
00bab23f | 1270 | EXPORT_SYMBOL_GPL(of_phandle_iterator_init); |
74e1fbb1 | 1271 | |
cd209b41 JR |
1272 | int of_phandle_iterator_next(struct of_phandle_iterator *it) |
1273 | { | |
1274 | uint32_t count = 0; | |
1275 | ||
1276 | if (it->node) { | |
1277 | of_node_put(it->node); | |
1278 | it->node = NULL; | |
1279 | } | |
1280 | ||
1281 | if (!it->cur || it->phandle_end >= it->list_end) | |
1282 | return -ENOENT; | |
1283 | ||
1284 | it->cur = it->phandle_end; | |
1285 | ||
1286 | /* If phandle is 0, then it is an empty entry with no arguments. */ | |
1287 | it->phandle = be32_to_cpup(it->cur++); | |
1288 | ||
1289 | if (it->phandle) { | |
64b60e09 | 1290 | |
15c9a0ac | 1291 | /* |
cd209b41 JR |
1292 | * Find the provider node and parse the #*-cells property to |
1293 | * determine the argument length. | |
15c9a0ac | 1294 | */ |
cd209b41 | 1295 | it->node = of_find_node_by_phandle(it->phandle); |
035fd948 | 1296 | |
cd209b41 JR |
1297 | if (it->cells_name) { |
1298 | if (!it->node) { | |
12e17243 EWI |
1299 | pr_err("%pOF: could not find phandle %d\n", |
1300 | it->parent, it->phandle); | |
cd209b41 | 1301 | goto err; |
15c9a0ac | 1302 | } |
64b60e09 | 1303 | |
cd209b41 JR |
1304 | if (of_property_read_u32(it->node, it->cells_name, |
1305 | &count)) { | |
e42ee610 UKK |
1306 | /* |
1307 | * If both cell_count and cells_name is given, | |
1308 | * fall back to cell_count in absence | |
1309 | * of the cells_name property | |
1310 | */ | |
1311 | if (it->cell_count >= 0) { | |
1312 | count = it->cell_count; | |
1313 | } else { | |
1314 | pr_err("%pOF: could not get %s for %pOF\n", | |
1315 | it->parent, | |
1316 | it->cells_name, | |
1317 | it->node); | |
1318 | goto err; | |
1319 | } | |
15c9a0ac | 1320 | } |
cd209b41 JR |
1321 | } else { |
1322 | count = it->cell_count; | |
64b60e09 AV |
1323 | } |
1324 | ||
15c9a0ac | 1325 | /* |
cd209b41 JR |
1326 | * Make sure that the arguments actually fit in the remaining |
1327 | * property data length | |
1328 | */ | |
1329 | if (it->cur + count > it->list_end) { | |
af3be70a FF |
1330 | pr_err("%pOF: %s = %d found %d\n", |
1331 | it->parent, it->cells_name, | |
1332 | count, it->cell_count); | |
cd209b41 JR |
1333 | goto err; |
1334 | } | |
1335 | } | |
1336 | ||
1337 | it->phandle_end = it->cur + count; | |
1338 | it->cur_count = count; | |
1339 | ||
1340 | return 0; | |
1341 | ||
1342 | err: | |
1343 | if (it->node) { | |
1344 | of_node_put(it->node); | |
1345 | it->node = NULL; | |
1346 | } | |
1347 | ||
1348 | return -EINVAL; | |
1349 | } | |
00bab23f | 1350 | EXPORT_SYMBOL_GPL(of_phandle_iterator_next); |
cd209b41 | 1351 | |
abdaa77b JR |
1352 | int of_phandle_iterator_args(struct of_phandle_iterator *it, |
1353 | uint32_t *args, | |
1354 | int size) | |
1355 | { | |
1356 | int i, count; | |
1357 | ||
1358 | count = it->cur_count; | |
1359 | ||
1360 | if (WARN_ON(size < count)) | |
1361 | count = size; | |
1362 | ||
1363 | for (i = 0; i < count; i++) | |
1364 | args[i] = be32_to_cpup(it->cur++); | |
1365 | ||
1366 | return count; | |
1367 | } | |
1368 | ||
bd69f73f GL |
1369 | static int __of_parse_phandle_with_args(const struct device_node *np, |
1370 | const char *list_name, | |
035fd948 SW |
1371 | const char *cells_name, |
1372 | int cell_count, int index, | |
bd69f73f | 1373 | struct of_phandle_args *out_args) |
64b60e09 | 1374 | { |
74e1fbb1 JR |
1375 | struct of_phandle_iterator it; |
1376 | int rc, cur_index = 0; | |
64b60e09 | 1377 | |
15c9a0ac | 1378 | /* Loop over the phandles until all the requested entry is found */ |
f623ce95 | 1379 | of_for_each_phandle(&it, rc, np, list_name, cells_name, cell_count) { |
15c9a0ac | 1380 | /* |
cd209b41 | 1381 | * All of the error cases bail out of the loop, so at |
15c9a0ac GL |
1382 | * this point, the parsing is successful. If the requested |
1383 | * index matches, then fill the out_args structure and return, | |
1384 | * or return -ENOENT for an empty entry. | |
1385 | */ | |
23ce04c0 | 1386 | rc = -ENOENT; |
15c9a0ac | 1387 | if (cur_index == index) { |
74e1fbb1 | 1388 | if (!it.phandle) |
23ce04c0 | 1389 | goto err; |
15c9a0ac GL |
1390 | |
1391 | if (out_args) { | |
abdaa77b JR |
1392 | int c; |
1393 | ||
1394 | c = of_phandle_iterator_args(&it, | |
1395 | out_args->args, | |
1396 | MAX_PHANDLE_ARGS); | |
74e1fbb1 | 1397 | out_args->np = it.node; |
abdaa77b | 1398 | out_args->args_count = c; |
b855f16b | 1399 | } else { |
74e1fbb1 | 1400 | of_node_put(it.node); |
15c9a0ac | 1401 | } |
23ce04c0 GL |
1402 | |
1403 | /* Found it! return success */ | |
15c9a0ac | 1404 | return 0; |
64b60e09 | 1405 | } |
64b60e09 | 1406 | |
64b60e09 AV |
1407 | cur_index++; |
1408 | } | |
1409 | ||
23ce04c0 GL |
1410 | /* |
1411 | * Unlock node before returning result; will be one of: | |
1412 | * -ENOENT : index is for empty phandle | |
1413 | * -EINVAL : parsing error on data | |
1414 | */ | |
cd209b41 | 1415 | |
23ce04c0 | 1416 | err: |
beab47d5 | 1417 | of_node_put(it.node); |
23ce04c0 | 1418 | return rc; |
64b60e09 | 1419 | } |
bd69f73f | 1420 | |
5fba49e3 SW |
1421 | /** |
1422 | * of_parse_phandle - Resolve a phandle property to a device_node pointer | |
1423 | * @np: Pointer to device node holding phandle property | |
1424 | * @phandle_name: Name of property holding a phandle value | |
1425 | * @index: For properties holding a table of phandles, this is the index into | |
1426 | * the table | |
1427 | * | |
8c8239c2 | 1428 | * Return: The device_node pointer with refcount incremented. Use |
5fba49e3 SW |
1429 | * of_node_put() on it when done. |
1430 | */ | |
1431 | struct device_node *of_parse_phandle(const struct device_node *np, | |
1432 | const char *phandle_name, int index) | |
1433 | { | |
91d9942c SW |
1434 | struct of_phandle_args args; |
1435 | ||
1436 | if (index < 0) | |
1437 | return NULL; | |
5fba49e3 | 1438 | |
91d9942c SW |
1439 | if (__of_parse_phandle_with_args(np, phandle_name, NULL, 0, |
1440 | index, &args)) | |
5fba49e3 SW |
1441 | return NULL; |
1442 | ||
91d9942c | 1443 | return args.np; |
5fba49e3 SW |
1444 | } |
1445 | EXPORT_SYMBOL(of_parse_phandle); | |
1446 | ||
eded9dd4 SW |
1447 | /** |
1448 | * of_parse_phandle_with_args() - Find a node pointed by phandle in a list | |
1449 | * @np: pointer to a device tree node containing a list | |
1450 | * @list_name: property name that contains a list | |
1451 | * @cells_name: property name that specifies phandles' arguments count | |
1452 | * @index: index of a phandle to parse out | |
1453 | * @out_args: optional pointer to output arguments structure (will be filled) | |
1454 | * | |
1455 | * This function is useful to parse lists of phandles and their arguments. | |
1456 | * Returns 0 on success and fills out_args, on error returns appropriate | |
1457 | * errno value. | |
1458 | * | |
d94a75c1 | 1459 | * Caller is responsible to call of_node_put() on the returned out_args->np |
eded9dd4 SW |
1460 | * pointer. |
1461 | * | |
62f026f0 | 1462 | * Example:: |
eded9dd4 | 1463 | * |
62f026f0 | 1464 | * phandle1: node1 { |
c0e848d8 | 1465 | * #list-cells = <2>; |
62f026f0 | 1466 | * }; |
eded9dd4 | 1467 | * |
62f026f0 | 1468 | * phandle2: node2 { |
c0e848d8 | 1469 | * #list-cells = <1>; |
62f026f0 | 1470 | * }; |
eded9dd4 | 1471 | * |
62f026f0 | 1472 | * node3 { |
c0e848d8 | 1473 | * list = <&phandle1 1 2 &phandle2 3>; |
62f026f0 | 1474 | * }; |
eded9dd4 | 1475 | * |
62f026f0 | 1476 | * To get a device_node of the ``node2`` node you may call this: |
eded9dd4 SW |
1477 | * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args); |
1478 | */ | |
bd69f73f GL |
1479 | int of_parse_phandle_with_args(const struct device_node *np, const char *list_name, |
1480 | const char *cells_name, int index, | |
1481 | struct of_phandle_args *out_args) | |
1482 | { | |
59e9fcf8 UKK |
1483 | int cell_count = -1; |
1484 | ||
bd69f73f GL |
1485 | if (index < 0) |
1486 | return -EINVAL; | |
59e9fcf8 UKK |
1487 | |
1488 | /* If cells_name is NULL we assume a cell count of 0 */ | |
1489 | if (!cells_name) | |
1490 | cell_count = 0; | |
1491 | ||
1492 | return __of_parse_phandle_with_args(np, list_name, cells_name, | |
1493 | cell_count, index, out_args); | |
bd69f73f | 1494 | } |
15c9a0ac | 1495 | EXPORT_SYMBOL(of_parse_phandle_with_args); |
02af11b0 | 1496 | |
bd6f2fd5 SB |
1497 | /** |
1498 | * of_parse_phandle_with_args_map() - Find a node pointed by phandle in a list and remap it | |
1499 | * @np: pointer to a device tree node containing a list | |
1500 | * @list_name: property name that contains a list | |
1501 | * @stem_name: stem of property names that specify phandles' arguments count | |
1502 | * @index: index of a phandle to parse out | |
1503 | * @out_args: optional pointer to output arguments structure (will be filled) | |
1504 | * | |
1505 | * This function is useful to parse lists of phandles and their arguments. | |
1506 | * Returns 0 on success and fills out_args, on error returns appropriate errno | |
1507 | * value. The difference between this function and of_parse_phandle_with_args() | |
1508 | * is that this API remaps a phandle if the node the phandle points to has | |
1509 | * a <@stem_name>-map property. | |
1510 | * | |
1511 | * Caller is responsible to call of_node_put() on the returned out_args->np | |
1512 | * pointer. | |
1513 | * | |
62f026f0 | 1514 | * Example:: |
bd6f2fd5 | 1515 | * |
62f026f0 RH |
1516 | * phandle1: node1 { |
1517 | * #list-cells = <2>; | |
1518 | * }; | |
bd6f2fd5 | 1519 | * |
62f026f0 RH |
1520 | * phandle2: node2 { |
1521 | * #list-cells = <1>; | |
1522 | * }; | |
bd6f2fd5 | 1523 | * |
62f026f0 RH |
1524 | * phandle3: node3 { |
1525 | * #list-cells = <1>; | |
1526 | * list-map = <0 &phandle2 3>, | |
1527 | * <1 &phandle2 2>, | |
1528 | * <2 &phandle1 5 1>; | |
1529 | * list-map-mask = <0x3>; | |
1530 | * }; | |
bd6f2fd5 | 1531 | * |
62f026f0 RH |
1532 | * node4 { |
1533 | * list = <&phandle1 1 2 &phandle3 0>; | |
1534 | * }; | |
bd6f2fd5 | 1535 | * |
62f026f0 | 1536 | * To get a device_node of the ``node2`` node you may call this: |
bd6f2fd5 SB |
1537 | * of_parse_phandle_with_args(node4, "list", "list", 1, &args); |
1538 | */ | |
1539 | int of_parse_phandle_with_args_map(const struct device_node *np, | |
1540 | const char *list_name, | |
1541 | const char *stem_name, | |
1542 | int index, struct of_phandle_args *out_args) | |
1543 | { | |
1544 | char *cells_name, *map_name = NULL, *mask_name = NULL; | |
1545 | char *pass_name = NULL; | |
1546 | struct device_node *cur, *new = NULL; | |
1547 | const __be32 *map, *mask, *pass; | |
1548 | static const __be32 dummy_mask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 }; | |
1549 | static const __be32 dummy_pass[] = { [0 ... MAX_PHANDLE_ARGS] = 0 }; | |
1550 | __be32 initial_match_array[MAX_PHANDLE_ARGS]; | |
1551 | const __be32 *match_array = initial_match_array; | |
1552 | int i, ret, map_len, match; | |
1553 | u32 list_size, new_size; | |
1554 | ||
1555 | if (index < 0) | |
1556 | return -EINVAL; | |
1557 | ||
1558 | cells_name = kasprintf(GFP_KERNEL, "#%s-cells", stem_name); | |
1559 | if (!cells_name) | |
1560 | return -ENOMEM; | |
1561 | ||
1562 | ret = -ENOMEM; | |
1563 | map_name = kasprintf(GFP_KERNEL, "%s-map", stem_name); | |
1564 | if (!map_name) | |
1565 | goto free; | |
1566 | ||
1567 | mask_name = kasprintf(GFP_KERNEL, "%s-map-mask", stem_name); | |
1568 | if (!mask_name) | |
1569 | goto free; | |
1570 | ||
1571 | pass_name = kasprintf(GFP_KERNEL, "%s-map-pass-thru", stem_name); | |
1572 | if (!pass_name) | |
1573 | goto free; | |
1574 | ||
e42ee610 | 1575 | ret = __of_parse_phandle_with_args(np, list_name, cells_name, -1, index, |
bd6f2fd5 SB |
1576 | out_args); |
1577 | if (ret) | |
1578 | goto free; | |
1579 | ||
1580 | /* Get the #<list>-cells property */ | |
1581 | cur = out_args->np; | |
1582 | ret = of_property_read_u32(cur, cells_name, &list_size); | |
1583 | if (ret < 0) | |
1584 | goto put; | |
1585 | ||
1586 | /* Precalculate the match array - this simplifies match loop */ | |
1587 | for (i = 0; i < list_size; i++) | |
1588 | initial_match_array[i] = cpu_to_be32(out_args->args[i]); | |
1589 | ||
1590 | ret = -EINVAL; | |
1591 | while (cur) { | |
1592 | /* Get the <list>-map property */ | |
1593 | map = of_get_property(cur, map_name, &map_len); | |
1594 | if (!map) { | |
1595 | ret = 0; | |
1596 | goto free; | |
1597 | } | |
1598 | map_len /= sizeof(u32); | |
1599 | ||
1600 | /* Get the <list>-map-mask property (optional) */ | |
1601 | mask = of_get_property(cur, mask_name, NULL); | |
1602 | if (!mask) | |
1603 | mask = dummy_mask; | |
1604 | /* Iterate through <list>-map property */ | |
1605 | match = 0; | |
1606 | while (map_len > (list_size + 1) && !match) { | |
1607 | /* Compare specifiers */ | |
1608 | match = 1; | |
1609 | for (i = 0; i < list_size; i++, map_len--) | |
1610 | match &= !((match_array[i] ^ *map++) & mask[i]); | |
1611 | ||
1612 | of_node_put(new); | |
1613 | new = of_find_node_by_phandle(be32_to_cpup(map)); | |
1614 | map++; | |
1615 | map_len--; | |
1616 | ||
1617 | /* Check if not found */ | |
1618 | if (!new) | |
1619 | goto put; | |
1620 | ||
1621 | if (!of_device_is_available(new)) | |
1622 | match = 0; | |
1623 | ||
1624 | ret = of_property_read_u32(new, cells_name, &new_size); | |
1625 | if (ret) | |
1626 | goto put; | |
1627 | ||
1628 | /* Check for malformed properties */ | |
1629 | if (WARN_ON(new_size > MAX_PHANDLE_ARGS)) | |
1630 | goto put; | |
1631 | if (map_len < new_size) | |
1632 | goto put; | |
1633 | ||
1634 | /* Move forward by new node's #<list>-cells amount */ | |
1635 | map += new_size; | |
1636 | map_len -= new_size; | |
1637 | } | |
1638 | if (!match) | |
1639 | goto put; | |
1640 | ||
1641 | /* Get the <list>-map-pass-thru property (optional) */ | |
1642 | pass = of_get_property(cur, pass_name, NULL); | |
1643 | if (!pass) | |
1644 | pass = dummy_pass; | |
1645 | ||
1646 | /* | |
1647 | * Successfully parsed a <list>-map translation; copy new | |
1648 | * specifier into the out_args structure, keeping the | |
1649 | * bits specified in <list>-map-pass-thru. | |
1650 | */ | |
1651 | match_array = map - new_size; | |
1652 | for (i = 0; i < new_size; i++) { | |
1653 | __be32 val = *(map - new_size + i); | |
1654 | ||
1655 | if (i < list_size) { | |
1656 | val &= ~pass[i]; | |
1657 | val |= cpu_to_be32(out_args->args[i]) & pass[i]; | |
1658 | } | |
1659 | ||
1660 | out_args->args[i] = be32_to_cpu(val); | |
1661 | } | |
1662 | out_args->args_count = list_size = new_size; | |
1663 | /* Iterate again with new provider */ | |
1664 | out_args->np = new; | |
1665 | of_node_put(cur); | |
1666 | cur = new; | |
1667 | } | |
1668 | put: | |
1669 | of_node_put(cur); | |
1670 | of_node_put(new); | |
1671 | free: | |
1672 | kfree(mask_name); | |
1673 | kfree(map_name); | |
1674 | kfree(cells_name); | |
1675 | kfree(pass_name); | |
1676 | ||
1677 | return ret; | |
1678 | } | |
1679 | EXPORT_SYMBOL(of_parse_phandle_with_args_map); | |
1680 | ||
035fd948 SW |
1681 | /** |
1682 | * of_parse_phandle_with_fixed_args() - Find a node pointed by phandle in a list | |
1683 | * @np: pointer to a device tree node containing a list | |
1684 | * @list_name: property name that contains a list | |
1685 | * @cell_count: number of argument cells following the phandle | |
1686 | * @index: index of a phandle to parse out | |
1687 | * @out_args: optional pointer to output arguments structure (will be filled) | |
1688 | * | |
1689 | * This function is useful to parse lists of phandles and their arguments. | |
1690 | * Returns 0 on success and fills out_args, on error returns appropriate | |
1691 | * errno value. | |
1692 | * | |
d94a75c1 | 1693 | * Caller is responsible to call of_node_put() on the returned out_args->np |
035fd948 SW |
1694 | * pointer. |
1695 | * | |
62f026f0 | 1696 | * Example:: |
035fd948 | 1697 | * |
62f026f0 RH |
1698 | * phandle1: node1 { |
1699 | * }; | |
035fd948 | 1700 | * |
62f026f0 RH |
1701 | * phandle2: node2 { |
1702 | * }; | |
035fd948 | 1703 | * |
62f026f0 RH |
1704 | * node3 { |
1705 | * list = <&phandle1 0 2 &phandle2 2 3>; | |
1706 | * }; | |
035fd948 | 1707 | * |
62f026f0 | 1708 | * To get a device_node of the ``node2`` node you may call this: |
035fd948 SW |
1709 | * of_parse_phandle_with_fixed_args(node3, "list", 2, 1, &args); |
1710 | */ | |
1711 | int of_parse_phandle_with_fixed_args(const struct device_node *np, | |
1712 | const char *list_name, int cell_count, | |
1713 | int index, struct of_phandle_args *out_args) | |
1714 | { | |
1715 | if (index < 0) | |
1716 | return -EINVAL; | |
1717 | return __of_parse_phandle_with_args(np, list_name, NULL, cell_count, | |
1718 | index, out_args); | |
1719 | } | |
1720 | EXPORT_SYMBOL(of_parse_phandle_with_fixed_args); | |
1721 | ||
bd69f73f GL |
1722 | /** |
1723 | * of_count_phandle_with_args() - Find the number of phandles references in a property | |
1724 | * @np: pointer to a device tree node containing a list | |
1725 | * @list_name: property name that contains a list | |
1726 | * @cells_name: property name that specifies phandles' arguments count | |
1727 | * | |
8c8239c2 | 1728 | * Return: The number of phandle + argument tuples within a property. It |
bd69f73f GL |
1729 | * is a typical pattern to encode a list of phandle and variable |
1730 | * arguments into a single property. The number of arguments is encoded | |
1731 | * by a property in the phandle-target node. For example, a gpios | |
1732 | * property would contain a list of GPIO specifies consisting of a | |
1733 | * phandle and 1 or more arguments. The number of arguments are | |
1734 | * determined by the #gpio-cells property in the node pointed to by the | |
1735 | * phandle. | |
1736 | */ | |
1737 | int of_count_phandle_with_args(const struct device_node *np, const char *list_name, | |
1738 | const char *cells_name) | |
1739 | { | |
2021bd01 JR |
1740 | struct of_phandle_iterator it; |
1741 | int rc, cur_index = 0; | |
1742 | ||
59e9fcf8 UKK |
1743 | /* |
1744 | * If cells_name is NULL we assume a cell count of 0. This makes | |
1745 | * counting the phandles trivial as each 32bit word in the list is a | |
1746 | * phandle and no arguments are to consider. So we don't iterate through | |
1747 | * the list but just use the length to determine the phandle count. | |
1748 | */ | |
1749 | if (!cells_name) { | |
1750 | const __be32 *list; | |
1751 | int size; | |
1752 | ||
1753 | list = of_get_property(np, list_name, &size); | |
1754 | if (!list) | |
1755 | return -ENOENT; | |
1756 | ||
1757 | return size / sizeof(*list); | |
1758 | } | |
1759 | ||
e42ee610 | 1760 | rc = of_phandle_iterator_init(&it, np, list_name, cells_name, -1); |
2021bd01 JR |
1761 | if (rc) |
1762 | return rc; | |
1763 | ||
1764 | while ((rc = of_phandle_iterator_next(&it)) == 0) | |
1765 | cur_index += 1; | |
1766 | ||
1767 | if (rc != -ENOENT) | |
1768 | return rc; | |
1769 | ||
1770 | return cur_index; | |
bd69f73f GL |
1771 | } |
1772 | EXPORT_SYMBOL(of_count_phandle_with_args); | |
1773 | ||
62664f67 XL |
1774 | /** |
1775 | * __of_add_property - Add a property to a node without lock operations | |
3637d49e | 1776 | * @np: Caller's Device Node |
31e46db0 | 1777 | * @prop: Property to add |
62664f67 | 1778 | */ |
d8c50088 | 1779 | int __of_add_property(struct device_node *np, struct property *prop) |
62664f67 XL |
1780 | { |
1781 | struct property **next; | |
1782 | ||
1783 | prop->next = NULL; | |
1784 | next = &np->properties; | |
1785 | while (*next) { | |
1786 | if (strcmp(prop->name, (*next)->name) == 0) | |
1787 | /* duplicate ! don't insert it */ | |
1788 | return -EEXIST; | |
1789 | ||
1790 | next = &(*next)->next; | |
1791 | } | |
1792 | *next = prop; | |
1793 | ||
1794 | return 0; | |
1795 | } | |
1796 | ||
02af11b0 | 1797 | /** |
79d1c712 | 1798 | * of_add_property - Add a property to a node |
3637d49e | 1799 | * @np: Caller's Device Node |
31e46db0 | 1800 | * @prop: Property to add |
02af11b0 | 1801 | */ |
79d1c712 | 1802 | int of_add_property(struct device_node *np, struct property *prop) |
02af11b0 | 1803 | { |
02af11b0 | 1804 | unsigned long flags; |
1cf3d8b3 NF |
1805 | int rc; |
1806 | ||
8a2b22a2 | 1807 | mutex_lock(&of_mutex); |
02af11b0 | 1808 | |
d6d3c4e6 | 1809 | raw_spin_lock_irqsave(&devtree_lock, flags); |
62664f67 | 1810 | rc = __of_add_property(np, prop); |
d6d3c4e6 | 1811 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 | 1812 | |
8a2b22a2 | 1813 | if (!rc) |
0829f6d1 | 1814 | __of_add_property_sysfs(np, prop); |
02af11b0 | 1815 | |
8a2b22a2 GL |
1816 | mutex_unlock(&of_mutex); |
1817 | ||
259092a3 GL |
1818 | if (!rc) |
1819 | of_property_notify(OF_RECONFIG_ADD_PROPERTY, np, prop, NULL); | |
1820 | ||
62664f67 | 1821 | return rc; |
02af11b0 | 1822 | } |
fe794e39 | 1823 | EXPORT_SYMBOL_GPL(of_add_property); |
02af11b0 | 1824 | |
d8c50088 PA |
1825 | int __of_remove_property(struct device_node *np, struct property *prop) |
1826 | { | |
1827 | struct property **next; | |
1828 | ||
1829 | for (next = &np->properties; *next; next = &(*next)->next) { | |
1830 | if (*next == prop) | |
1831 | break; | |
1832 | } | |
1833 | if (*next == NULL) | |
1834 | return -ENODEV; | |
1835 | ||
1836 | /* found the node */ | |
1837 | *next = prop->next; | |
1838 | prop->next = np->deadprops; | |
1839 | np->deadprops = prop; | |
1840 | ||
1841 | return 0; | |
1842 | } | |
1843 | ||
02af11b0 | 1844 | /** |
79d1c712 | 1845 | * of_remove_property - Remove a property from a node. |
3637d49e | 1846 | * @np: Caller's Device Node |
31e46db0 | 1847 | * @prop: Property to remove |
02af11b0 GL |
1848 | * |
1849 | * Note that we don't actually remove it, since we have given out | |
1850 | * who-knows-how-many pointers to the data using get-property. | |
1851 | * Instead we just move the property to the "dead properties" | |
1852 | * list, so it won't be found any more. | |
1853 | */ | |
79d1c712 | 1854 | int of_remove_property(struct device_node *np, struct property *prop) |
02af11b0 | 1855 | { |
02af11b0 | 1856 | unsigned long flags; |
1cf3d8b3 NF |
1857 | int rc; |
1858 | ||
201b3fe5 SJS |
1859 | if (!prop) |
1860 | return -ENODEV; | |
1861 | ||
8a2b22a2 | 1862 | mutex_lock(&of_mutex); |
02af11b0 | 1863 | |
d6d3c4e6 | 1864 | raw_spin_lock_irqsave(&devtree_lock, flags); |
d8c50088 | 1865 | rc = __of_remove_property(np, prop); |
d6d3c4e6 | 1866 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
02af11b0 | 1867 | |
8a2b22a2 GL |
1868 | if (!rc) |
1869 | __of_remove_property_sysfs(np, prop); | |
02af11b0 | 1870 | |
8a2b22a2 | 1871 | mutex_unlock(&of_mutex); |
75b57ecf | 1872 | |
259092a3 GL |
1873 | if (!rc) |
1874 | of_property_notify(OF_RECONFIG_REMOVE_PROPERTY, np, prop, NULL); | |
02af11b0 | 1875 | |
8a2b22a2 | 1876 | return rc; |
02af11b0 | 1877 | } |
0f7c5317 | 1878 | EXPORT_SYMBOL_GPL(of_remove_property); |
02af11b0 | 1879 | |
d8c50088 PA |
1880 | int __of_update_property(struct device_node *np, struct property *newprop, |
1881 | struct property **oldpropp) | |
02af11b0 | 1882 | { |
475d0094 | 1883 | struct property **next, *oldprop; |
02af11b0 | 1884 | |
d8c50088 PA |
1885 | for (next = &np->properties; *next; next = &(*next)->next) { |
1886 | if (of_prop_cmp((*next)->name, newprop->name) == 0) | |
1887 | break; | |
1888 | } | |
1889 | *oldpropp = oldprop = *next; | |
475d0094 | 1890 | |
d8c50088 | 1891 | if (oldprop) { |
947fdaad | 1892 | /* replace the node */ |
d8c50088 PA |
1893 | newprop->next = oldprop->next; |
1894 | *next = newprop; | |
1895 | oldprop->next = np->deadprops; | |
1896 | np->deadprops = oldprop; | |
1897 | } else { | |
1898 | /* new node */ | |
1899 | newprop->next = NULL; | |
1900 | *next = newprop; | |
02af11b0 | 1901 | } |
75b57ecf | 1902 | |
d8c50088 PA |
1903 | return 0; |
1904 | } | |
1905 | ||
fcdeb7fe | 1906 | /* |
79d1c712 | 1907 | * of_update_property - Update a property in a node, if the property does |
475d0094 | 1908 | * not exist, add it. |
fcdeb7fe | 1909 | * |
02af11b0 GL |
1910 | * Note that we don't actually remove it, since we have given out |
1911 | * who-knows-how-many pointers to the data using get-property. | |
1912 | * Instead we just move the property to the "dead properties" list, | |
1913 | * and add the new property to the property list | |
fcdeb7fe | 1914 | */ |
79d1c712 | 1915 | int of_update_property(struct device_node *np, struct property *newprop) |
fcdeb7fe | 1916 | { |
d8c50088 | 1917 | struct property *oldprop; |
fcdeb7fe | 1918 | unsigned long flags; |
1cf3d8b3 NF |
1919 | int rc; |
1920 | ||
d8c50088 PA |
1921 | if (!newprop->name) |
1922 | return -EINVAL; | |
1cf3d8b3 | 1923 | |
8a2b22a2 | 1924 | mutex_lock(&of_mutex); |
fcdeb7fe | 1925 | |
d6d3c4e6 | 1926 | raw_spin_lock_irqsave(&devtree_lock, flags); |
d8c50088 | 1927 | rc = __of_update_property(np, newprop, &oldprop); |
d6d3c4e6 | 1928 | raw_spin_unlock_irqrestore(&devtree_lock, flags); |
fcdeb7fe | 1929 | |
8a2b22a2 GL |
1930 | if (!rc) |
1931 | __of_update_property_sysfs(np, newprop, oldprop); | |
fcdeb7fe | 1932 | |
8a2b22a2 | 1933 | mutex_unlock(&of_mutex); |
fcdeb7fe | 1934 | |
259092a3 GL |
1935 | if (!rc) |
1936 | of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop, oldprop); | |
e81b3295 | 1937 | |
1cf3d8b3 | 1938 | return rc; |
fcdeb7fe | 1939 | } |
fcdeb7fe | 1940 | |
611cad72 SG |
1941 | static void of_alias_add(struct alias_prop *ap, struct device_node *np, |
1942 | int id, const char *stem, int stem_len) | |
1943 | { | |
1944 | ap->np = np; | |
1945 | ap->id = id; | |
1946 | strncpy(ap->stem, stem, stem_len); | |
1947 | ap->stem[stem_len] = 0; | |
1948 | list_add_tail(&ap->link, &aliases_lookup); | |
0d638a07 RH |
1949 | pr_debug("adding DT alias:%s: stem=%s id=%i node=%pOF\n", |
1950 | ap->alias, ap->stem, ap->id, np); | |
611cad72 SG |
1951 | } |
1952 | ||
1953 | /** | |
1821dda4 | 1954 | * of_alias_scan - Scan all properties of the 'aliases' node |
62f026f0 RH |
1955 | * @dt_alloc: An allocator that provides a virtual address to memory |
1956 | * for storing the resulting tree | |
611cad72 | 1957 | * |
1821dda4 GU |
1958 | * The function scans all the properties of the 'aliases' node and populates |
1959 | * the global lookup table with the properties. It returns the | |
1960 | * number of alias properties found, or an error code in case of failure. | |
611cad72 SG |
1961 | */ |
1962 | void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align)) | |
1963 | { | |
1964 | struct property *pp; | |
1965 | ||
7dbe5849 | 1966 | of_aliases = of_find_node_by_path("/aliases"); |
611cad72 SG |
1967 | of_chosen = of_find_node_by_path("/chosen"); |
1968 | if (of_chosen == NULL) | |
1969 | of_chosen = of_find_node_by_path("/chosen@0"); | |
5c19e952 SH |
1970 | |
1971 | if (of_chosen) { | |
a752ee56 | 1972 | /* linux,stdout-path and /aliases/stdout are for legacy compatibility */ |
b0d9d92f SS |
1973 | const char *name = NULL; |
1974 | ||
1975 | if (of_property_read_string(of_chosen, "stdout-path", &name)) | |
1976 | of_property_read_string(of_chosen, "linux,stdout-path", | |
1977 | &name); | |
a752ee56 | 1978 | if (IS_ENABLED(CONFIG_PPC) && !name) |
b0d9d92f | 1979 | of_property_read_string(of_aliases, "stdout", &name); |
f64255b5 | 1980 | if (name) |
7914a7c5 | 1981 | of_stdout = of_find_node_opts_by_path(name, &of_stdout_options); |
5c19e952 SH |
1982 | } |
1983 | ||
611cad72 SG |
1984 | if (!of_aliases) |
1985 | return; | |
1986 | ||
8af0da93 | 1987 | for_each_property_of_node(of_aliases, pp) { |
611cad72 SG |
1988 | const char *start = pp->name; |
1989 | const char *end = start + strlen(start); | |
1990 | struct device_node *np; | |
1991 | struct alias_prop *ap; | |
1992 | int id, len; | |
1993 | ||
1994 | /* Skip those we do not want to proceed */ | |
1995 | if (!strcmp(pp->name, "name") || | |
1996 | !strcmp(pp->name, "phandle") || | |
1997 | !strcmp(pp->name, "linux,phandle")) | |
1998 | continue; | |
1999 | ||
2000 | np = of_find_node_by_path(pp->value); | |
2001 | if (!np) | |
2002 | continue; | |
2003 | ||
2004 | /* walk the alias backwards to extract the id and work out | |
2005 | * the 'stem' string */ | |
2006 | while (isdigit(*(end-1)) && end > start) | |
2007 | end--; | |
2008 | len = end - start; | |
2009 | ||
2010 | if (kstrtoint(end, 10, &id) < 0) | |
2011 | continue; | |
2012 | ||
2013 | /* Allocate an alias_prop with enough space for the stem */ | |
de96ec2a | 2014 | ap = dt_alloc(sizeof(*ap) + len + 1, __alignof__(*ap)); |
611cad72 SG |
2015 | if (!ap) |
2016 | continue; | |
0640332e | 2017 | memset(ap, 0, sizeof(*ap) + len + 1); |
611cad72 SG |
2018 | ap->alias = start; |
2019 | of_alias_add(ap, np, id, start, len); | |
2020 | } | |
2021 | } | |
2022 | ||
2023 | /** | |
2024 | * of_alias_get_id - Get alias id for the given device_node | |
2025 | * @np: Pointer to the given device_node | |
2026 | * @stem: Alias stem of the given device_node | |
2027 | * | |
5a53a07f | 2028 | * The function travels the lookup table to get the alias id for the given |
8c8239c2 RH |
2029 | * device_node and alias stem. |
2030 | * | |
2031 | * Return: The alias id if found. | |
611cad72 SG |
2032 | */ |
2033 | int of_alias_get_id(struct device_node *np, const char *stem) | |
2034 | { | |
2035 | struct alias_prop *app; | |
2036 | int id = -ENODEV; | |
2037 | ||
c05aba2b | 2038 | mutex_lock(&of_mutex); |
611cad72 SG |
2039 | list_for_each_entry(app, &aliases_lookup, link) { |
2040 | if (strcmp(app->stem, stem) != 0) | |
2041 | continue; | |
2042 | ||
2043 | if (np == app->np) { | |
2044 | id = app->id; | |
2045 | break; | |
2046 | } | |
2047 | } | |
c05aba2b | 2048 | mutex_unlock(&of_mutex); |
611cad72 SG |
2049 | |
2050 | return id; | |
2051 | } | |
2052 | EXPORT_SYMBOL_GPL(of_alias_get_id); | |
c541adc6 | 2053 | |
b1078c35 MS |
2054 | /** |
2055 | * of_alias_get_alias_list - Get alias list for the given device driver | |
2056 | * @matches: Array of OF device match structures to search in | |
2057 | * @stem: Alias stem of the given device_node | |
2058 | * @bitmap: Bitmap field pointer | |
7acf79b6 | 2059 | * @nbits: Maximum number of alias IDs which can be recorded in bitmap |
b1078c35 MS |
2060 | * |
2061 | * The function travels the lookup table to record alias ids for the given | |
2062 | * device match structures and alias stem. | |
2063 | * | |
59eaeba6 MS |
2064 | * Return: 0 or -ENOSYS when !CONFIG_OF or |
2065 | * -EOVERFLOW if alias ID is greater then allocated nbits | |
b1078c35 MS |
2066 | */ |
2067 | int of_alias_get_alias_list(const struct of_device_id *matches, | |
2068 | const char *stem, unsigned long *bitmap, | |
2069 | unsigned int nbits) | |
2070 | { | |
2071 | struct alias_prop *app; | |
59eaeba6 | 2072 | int ret = 0; |
b1078c35 MS |
2073 | |
2074 | /* Zero bitmap field to make sure that all the time it is clean */ | |
2075 | bitmap_zero(bitmap, nbits); | |
2076 | ||
2077 | mutex_lock(&of_mutex); | |
2078 | pr_debug("%s: Looking for stem: %s\n", __func__, stem); | |
2079 | list_for_each_entry(app, &aliases_lookup, link) { | |
2080 | pr_debug("%s: stem: %s, id: %d\n", | |
2081 | __func__, app->stem, app->id); | |
2082 | ||
2083 | if (strcmp(app->stem, stem) != 0) { | |
7acf79b6 | 2084 | pr_debug("%s: stem comparison didn't pass %s\n", |
b1078c35 MS |
2085 | __func__, app->stem); |
2086 | continue; | |
2087 | } | |
2088 | ||
b1078c35 MS |
2089 | if (of_match_node(matches, app->np)) { |
2090 | pr_debug("%s: Allocated ID %d\n", __func__, app->id); | |
59eaeba6 MS |
2091 | |
2092 | if (app->id >= nbits) { | |
2093 | pr_warn("%s: ID %d >= than bitmap field %d\n", | |
2094 | __func__, app->id, nbits); | |
2095 | ret = -EOVERFLOW; | |
2096 | } else { | |
2097 | set_bit(app->id, bitmap); | |
2098 | } | |
b1078c35 | 2099 | } |
b1078c35 MS |
2100 | } |
2101 | mutex_unlock(&of_mutex); | |
2102 | ||
59eaeba6 | 2103 | return ret; |
b1078c35 MS |
2104 | } |
2105 | EXPORT_SYMBOL_GPL(of_alias_get_alias_list); | |
2106 | ||
351d224f WS |
2107 | /** |
2108 | * of_alias_get_highest_id - Get highest alias id for the given stem | |
2109 | * @stem: Alias stem to be examined | |
2110 | * | |
2111 | * The function travels the lookup table to get the highest alias id for the | |
2112 | * given alias stem. It returns the alias id if found. | |
2113 | */ | |
2114 | int of_alias_get_highest_id(const char *stem) | |
2115 | { | |
2116 | struct alias_prop *app; | |
2117 | int id = -ENODEV; | |
2118 | ||
2119 | mutex_lock(&of_mutex); | |
2120 | list_for_each_entry(app, &aliases_lookup, link) { | |
2121 | if (strcmp(app->stem, stem) != 0) | |
2122 | continue; | |
2123 | ||
2124 | if (app->id > id) | |
2125 | id = app->id; | |
2126 | } | |
2127 | mutex_unlock(&of_mutex); | |
2128 | ||
2129 | return id; | |
2130 | } | |
2131 | EXPORT_SYMBOL_GPL(of_alias_get_highest_id); | |
2132 | ||
5c19e952 | 2133 | /** |
3482f2c5 | 2134 | * of_console_check() - Test and setup console for DT setup |
3637d49e LJ |
2135 | * @dn: Pointer to device node |
2136 | * @name: Name to use for preferred console without index. ex. "ttyS" | |
2137 | * @index: Index to use for preferred console. | |
3482f2c5 GL |
2138 | * |
2139 | * Check if the given device node matches the stdout-path property in the | |
8c8239c2 RH |
2140 | * /chosen node. If it does then register it as the preferred console. |
2141 | * | |
2142 | * Return: TRUE if console successfully setup. Otherwise return FALSE. | |
5c19e952 | 2143 | */ |
3482f2c5 | 2144 | bool of_console_check(struct device_node *dn, char *name, int index) |
5c19e952 | 2145 | { |
3482f2c5 | 2146 | if (!dn || dn != of_stdout || console_set_on_cmdline) |
5c19e952 | 2147 | return false; |
db179e0d SS |
2148 | |
2149 | /* | |
2150 | * XXX: cast `options' to char pointer to suppress complication | |
2151 | * warnings: printk, UART and console drivers expect char pointer. | |
2152 | */ | |
2153 | return !add_preferred_console(name, index, (char *)of_stdout_options); | |
5c19e952 | 2154 | } |
3482f2c5 | 2155 | EXPORT_SYMBOL_GPL(of_console_check); |
a3e31b45 SH |
2156 | |
2157 | /** | |
62f026f0 RH |
2158 | * of_find_next_cache_node - Find a node's subsidiary cache |
2159 | * @np: node of type "cpu" or "cache" | |
a3e31b45 | 2160 | * |
62f026f0 RH |
2161 | * Return: A node pointer with refcount incremented, use |
2162 | * of_node_put() on it when done. Caller should hold a reference | |
2163 | * to np. | |
a3e31b45 SH |
2164 | */ |
2165 | struct device_node *of_find_next_cache_node(const struct device_node *np) | |
2166 | { | |
91d96749 | 2167 | struct device_node *child, *cache_node; |
a3e31b45 | 2168 | |
91d96749 RH |
2169 | cache_node = of_parse_phandle(np, "l2-cache", 0); |
2170 | if (!cache_node) | |
2171 | cache_node = of_parse_phandle(np, "next-level-cache", 0); | |
a3e31b45 | 2172 | |
91d96749 RH |
2173 | if (cache_node) |
2174 | return cache_node; | |
a3e31b45 SH |
2175 | |
2176 | /* OF on pmac has nodes instead of properties named "l2-cache" | |
2177 | * beneath CPU nodes. | |
2178 | */ | |
e8b1dee2 | 2179 | if (IS_ENABLED(CONFIG_PPC_PMAC) && of_node_is_type(np, "cpu")) |
a3e31b45 | 2180 | for_each_child_of_node(np, child) |
e8b1dee2 | 2181 | if (of_node_is_type(child, "cache")) |
a3e31b45 SH |
2182 | return child; |
2183 | ||
2184 | return NULL; | |
2185 | } | |
fd9fdb78 | 2186 | |
5fa23530 SH |
2187 | /** |
2188 | * of_find_last_cache_level - Find the level at which the last cache is | |
2189 | * present for the given logical cpu | |
2190 | * | |
2191 | * @cpu: cpu number(logical index) for which the last cache level is needed | |
2192 | * | |
8c8239c2 | 2193 | * Return: The the level at which the last cache is present. It is exactly |
5fa23530 SH |
2194 | * same as the total number of cache levels for the given logical cpu. |
2195 | */ | |
2196 | int of_find_last_cache_level(unsigned int cpu) | |
2197 | { | |
2198 | u32 cache_level = 0; | |
2199 | struct device_node *prev = NULL, *np = of_cpu_device_node_get(cpu); | |
2200 | ||
2201 | while (np) { | |
2202 | prev = np; | |
2203 | of_node_put(np); | |
2204 | np = of_find_next_cache_node(np); | |
2205 | } | |
2206 | ||
2207 | of_property_read_u32(prev, "cache-level", &cache_level); | |
2208 | ||
2209 | return cache_level; | |
2210 | } | |
2a6db719 NG |
2211 | |
2212 | /** | |
746a71d0 | 2213 | * of_map_id - Translate an ID through a downstream mapping. |
2a6db719 | 2214 | * @np: root complex device node. |
746a71d0 | 2215 | * @id: device ID to map. |
2a6db719 NG |
2216 | * @map_name: property name of the map to use. |
2217 | * @map_mask_name: optional property name of the mask to use. | |
2218 | * @target: optional pointer to a target device node. | |
2219 | * @id_out: optional pointer to receive the translated ID. | |
2220 | * | |
746a71d0 | 2221 | * Given a device ID, look up the appropriate implementation-defined |
2a6db719 NG |
2222 | * platform ID and/or the target device which receives transactions on that |
2223 | * ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or | |
2224 | * @id_out may be NULL if only the other is required. If @target points to | |
2225 | * a non-NULL device node pointer, only entries targeting that node will be | |
2226 | * matched; if it points to a NULL value, it will receive the device node of | |
2227 | * the first matching target phandle, with a reference held. | |
2228 | * | |
2229 | * Return: 0 on success or a standard error code on failure. | |
2230 | */ | |
746a71d0 | 2231 | int of_map_id(struct device_node *np, u32 id, |
2a6db719 NG |
2232 | const char *map_name, const char *map_mask_name, |
2233 | struct device_node **target, u32 *id_out) | |
2234 | { | |
746a71d0 | 2235 | u32 map_mask, masked_id; |
2a6db719 NG |
2236 | int map_len; |
2237 | const __be32 *map = NULL; | |
2238 | ||
2239 | if (!np || !map_name || (!target && !id_out)) | |
2240 | return -EINVAL; | |
2241 | ||
2242 | map = of_get_property(np, map_name, &map_len); | |
2243 | if (!map) { | |
2244 | if (target) | |
2245 | return -ENODEV; | |
2246 | /* Otherwise, no map implies no translation */ | |
746a71d0 | 2247 | *id_out = id; |
2a6db719 NG |
2248 | return 0; |
2249 | } | |
2250 | ||
2251 | if (!map_len || map_len % (4 * sizeof(*map))) { | |
2252 | pr_err("%pOF: Error: Bad %s length: %d\n", np, | |
2253 | map_name, map_len); | |
2254 | return -EINVAL; | |
2255 | } | |
2256 | ||
2257 | /* The default is to select all bits. */ | |
2258 | map_mask = 0xffffffff; | |
2259 | ||
2260 | /* | |
2261 | * Can be overridden by "{iommu,msi}-map-mask" property. | |
2262 | * If of_property_read_u32() fails, the default is used. | |
2263 | */ | |
2264 | if (map_mask_name) | |
2265 | of_property_read_u32(np, map_mask_name, &map_mask); | |
2266 | ||
746a71d0 | 2267 | masked_id = map_mask & id; |
2a6db719 NG |
2268 | for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) { |
2269 | struct device_node *phandle_node; | |
746a71d0 | 2270 | u32 id_base = be32_to_cpup(map + 0); |
2a6db719 NG |
2271 | u32 phandle = be32_to_cpup(map + 1); |
2272 | u32 out_base = be32_to_cpup(map + 2); | |
746a71d0 | 2273 | u32 id_len = be32_to_cpup(map + 3); |
2a6db719 | 2274 | |
746a71d0 LP |
2275 | if (id_base & ~map_mask) { |
2276 | pr_err("%pOF: Invalid %s translation - %s-mask (0x%x) ignores id-base (0x%x)\n", | |
2a6db719 | 2277 | np, map_name, map_name, |
746a71d0 | 2278 | map_mask, id_base); |
2a6db719 NG |
2279 | return -EFAULT; |
2280 | } | |
2281 | ||
746a71d0 | 2282 | if (masked_id < id_base || masked_id >= id_base + id_len) |
2a6db719 NG |
2283 | continue; |
2284 | ||
2285 | phandle_node = of_find_node_by_phandle(phandle); | |
2286 | if (!phandle_node) | |
2287 | return -ENODEV; | |
2288 | ||
2289 | if (target) { | |
2290 | if (*target) | |
2291 | of_node_put(phandle_node); | |
2292 | else | |
2293 | *target = phandle_node; | |
2294 | ||
2295 | if (*target != phandle_node) | |
2296 | continue; | |
2297 | } | |
2298 | ||
2299 | if (id_out) | |
746a71d0 | 2300 | *id_out = masked_id - id_base + out_base; |
2a6db719 | 2301 | |
746a71d0 LP |
2302 | pr_debug("%pOF: %s, using mask %08x, id-base: %08x, out-base: %08x, length: %08x, id: %08x -> %08x\n", |
2303 | np, map_name, map_mask, id_base, out_base, | |
2304 | id_len, id, masked_id - id_base + out_base); | |
2a6db719 NG |
2305 | return 0; |
2306 | } | |
2307 | ||
746a71d0 LP |
2308 | pr_info("%pOF: no %s translation for id 0x%x on %pOF\n", np, map_name, |
2309 | id, target && *target ? *target : NULL); | |
fb709b5e JPB |
2310 | |
2311 | /* Bypasses translation */ | |
2312 | if (id_out) | |
746a71d0 | 2313 | *id_out = id; |
fb709b5e | 2314 | return 0; |
2a6db719 | 2315 | } |
746a71d0 | 2316 | EXPORT_SYMBOL_GPL(of_map_id); |