blob: 085c6389afd135b25987add40f31725e33f4db0d [file] [log] [blame]
Grant Likelye169cfb2009-11-23 14:53:09 -07001/*
2 * Functions for working with the Flattened Device Tree data format
3 *
4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
5 * benh@kernel.crashing.org
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 */
11
Rob Herring606ad422016-06-15 08:32:18 -050012#define pr_fmt(fmt) "OF: fdt:" fmt
13
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +010014#include <linux/crc32.h>
Grant Likely41f88002009-11-23 20:07:01 -070015#include <linux/kernel.h>
Grant Likelyf7b3a832009-11-24 03:26:58 -070016#include <linux/initrd.h>
Grant Likelya1727da2013-08-28 21:18:32 +010017#include <linux/memblock.h>
Guenter Roeckf8062382015-12-05 16:13:53 -080018#include <linux/mutex.h>
Grant Likelye169cfb2009-11-23 14:53:09 -070019#include <linux/of.h>
20#include <linux/of_fdt.h>
Marek Szyprowski3f0c8202014-02-28 14:42:48 +010021#include <linux/of_reserved_mem.h>
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +010022#include <linux/sizes.h>
Jeremy Kerr4ef7b372010-02-14 07:13:47 -070023#include <linux/string.h>
24#include <linux/errno.h>
Stephen Neuendorfferfe140422010-11-18 15:55:02 -080025#include <linux/slab.h>
Rob Herringe6a69282014-04-02 15:10:14 -050026#include <linux/libfdt.h>
Rob Herringb0a6fb32014-04-02 16:56:48 -050027#include <linux/debugfs.h>
Rob Herringfb11ffe2014-03-27 08:07:01 -050028#include <linux/serial_core.h>
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +010029#include <linux/sysfs.h>
Grant Likely51975db2010-02-01 21:34:14 -070030
Fabio Estevamc89810a2012-01-02 14:19:03 -020031#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
Jeremy Kerr4ef7b372010-02-14 07:13:47 -070032#include <asm/page.h>
33
Laura Abbott704033c2014-07-15 10:03:35 -070034/*
35 * of_fdt_limit_memory - limit the number of regions in the /memory node
36 * @limit: maximum entries
37 *
38 * Adjust the flattened device tree to have at most 'limit' number of
39 * memory entries in the /memory node. This function may be called
40 * any time after initial_boot_param is set.
41 */
42void of_fdt_limit_memory(int limit)
43{
44 int memory;
45 int len;
46 const void *val;
47 int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
48 int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
49 const uint32_t *addr_prop;
50 const uint32_t *size_prop;
51 int root_offset;
52 int cell_size;
53
54 root_offset = fdt_path_offset(initial_boot_params, "/");
55 if (root_offset < 0)
56 return;
57
58 addr_prop = fdt_getprop(initial_boot_params, root_offset,
59 "#address-cells", NULL);
60 if (addr_prop)
61 nr_address_cells = fdt32_to_cpu(*addr_prop);
62
63 size_prop = fdt_getprop(initial_boot_params, root_offset,
64 "#size-cells", NULL);
65 if (size_prop)
66 nr_size_cells = fdt32_to_cpu(*size_prop);
67
68 cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells);
69
70 memory = fdt_path_offset(initial_boot_params, "/memory");
71 if (memory > 0) {
72 val = fdt_getprop(initial_boot_params, memory, "reg", &len);
73 if (len > limit*cell_size) {
74 len = limit*cell_size;
75 pr_debug("Limiting number of entries to %d\n", limit);
76 fdt_setprop(initial_boot_params, memory, "reg", val,
77 len);
78 }
79 }
80}
81
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080082/**
83 * of_fdt_is_compatible - Return true if given node from the given blob has
84 * compat in its compatible list
85 * @blob: A device tree blob
86 * @node: node to test
87 * @compat: compatible string to compare with compatible list.
Grant Likelya4f740c2010-10-30 11:49:09 -040088 *
89 * On match, returns a non-zero value with smaller values returned for more
90 * specific compatible values.
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080091 */
Rob Herringc972de12014-04-01 22:48:01 -050092int of_fdt_is_compatible(const void *blob,
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080093 unsigned long node, const char *compat)
94{
95 const char *cp;
Rob Herring9d0c4df2014-04-01 23:49:03 -050096 int cplen;
97 unsigned long l, score = 0;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080098
Rob Herringe6a69282014-04-02 15:10:14 -050099 cp = fdt_getprop(blob, node, "compatible", &cplen);
Stephen Neuendorffer9706a362010-11-18 15:54:59 -0800100 if (cp == NULL)
101 return 0;
102 while (cplen > 0) {
Grant Likelya4f740c2010-10-30 11:49:09 -0400103 score++;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -0800104 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
Grant Likelya4f740c2010-10-30 11:49:09 -0400105 return score;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -0800106 l = strlen(cp) + 1;
107 cp += l;
108 cplen -= l;
109 }
110
111 return 0;
112}
113
Grant Likelya4f740c2010-10-30 11:49:09 -0400114/**
Kevin Cernekeecc783782015-04-09 13:05:15 -0700115 * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses
116 * @blob: A device tree blob
117 * @node: node to test
118 *
119 * Returns true if the node has a "big-endian" property, or if the kernel
120 * was compiled for BE *and* the node has a "native-endian" property.
121 * Returns false otherwise.
122 */
123bool of_fdt_is_big_endian(const void *blob, unsigned long node)
124{
125 if (fdt_getprop(blob, node, "big-endian", NULL))
126 return true;
127 if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
128 fdt_getprop(blob, node, "native-endian", NULL))
129 return true;
130 return false;
131}
132
133/**
Grant Likelya4f740c2010-10-30 11:49:09 -0400134 * of_fdt_match - Return true if node matches a list of compatible values
135 */
Rob Herringc972de12014-04-01 22:48:01 -0500136int of_fdt_match(const void *blob, unsigned long node,
Uwe Kleine-König7b482c82011-12-20 22:56:45 +0100137 const char *const *compat)
Grant Likelya4f740c2010-10-30 11:49:09 -0400138{
139 unsigned int tmp, score = 0;
140
141 if (!compat)
142 return 0;
143
144 while (*compat) {
145 tmp = of_fdt_is_compatible(blob, node, *compat);
146 if (tmp && (score == 0 || (tmp < score)))
147 score = tmp;
148 compat++;
149 }
150
151 return score;
152}
153
Grant Likely44856812013-08-29 13:30:35 +0100154static void *unflatten_dt_alloc(void **mem, unsigned long size,
Grant Likelybbd33932009-11-23 20:07:00 -0700155 unsigned long align)
156{
157 void *res;
158
Grant Likely44856812013-08-29 13:30:35 +0100159 *mem = PTR_ALIGN(*mem, align);
160 res = *mem;
Grant Likelybbd33932009-11-23 20:07:00 -0700161 *mem += size;
162
163 return res;
164}
165
Gavin Shandfbd4c62016-05-03 23:22:47 +1000166static void populate_properties(const void *blob,
167 int offset,
168 void **mem,
169 struct device_node *np,
170 const char *nodename,
Grant Likely5063e252014-10-03 16:28:27 +0100171 bool dryrun)
Grant Likelybbd33932009-11-23 20:07:00 -0700172{
Gavin Shandfbd4c62016-05-03 23:22:47 +1000173 struct property *pp, **pprev = NULL;
174 int cur;
175 bool has_name = false;
176
177 pprev = &np->properties;
178 for (cur = fdt_first_property_offset(blob, offset);
179 cur >= 0;
180 cur = fdt_next_property_offset(blob, cur)) {
181 const __be32 *val;
182 const char *pname;
183 u32 sz;
184
185 val = fdt_getprop_by_offset(blob, cur, &pname, &sz);
186 if (!val) {
Rob Herring606ad422016-06-15 08:32:18 -0500187 pr_warn("Cannot locate property at 0x%x\n", cur);
Gavin Shandfbd4c62016-05-03 23:22:47 +1000188 continue;
189 }
190
191 if (!pname) {
Rob Herring606ad422016-06-15 08:32:18 -0500192 pr_warn("Cannot find property name at 0x%x\n", cur);
Gavin Shandfbd4c62016-05-03 23:22:47 +1000193 continue;
194 }
195
196 if (!strcmp(pname, "name"))
197 has_name = true;
198
199 pp = unflatten_dt_alloc(mem, sizeof(struct property),
200 __alignof__(struct property));
201 if (dryrun)
202 continue;
203
204 /* We accept flattened tree phandles either in
205 * ePAPR-style "phandle" properties, or the
206 * legacy "linux,phandle" properties. If both
207 * appear and have different values, things
208 * will get weird. Don't do that.
209 */
210 if (!strcmp(pname, "phandle") ||
211 !strcmp(pname, "linux,phandle")) {
212 if (!np->phandle)
213 np->phandle = be32_to_cpup(val);
214 }
215
216 /* And we process the "ibm,phandle" property
217 * used in pSeries dynamic device tree
218 * stuff
219 */
220 if (!strcmp(pname, "ibm,phandle"))
221 np->phandle = be32_to_cpup(val);
222
223 pp->name = (char *)pname;
224 pp->length = sz;
225 pp->value = (__be32 *)val;
226 *pprev = pp;
227 pprev = &pp->next;
228 }
229
230 /* With version 0x10 we may not have the name property,
231 * recreate it here from the unit name if absent
232 */
233 if (!has_name) {
234 const char *p = nodename, *ps = p, *pa = NULL;
235 int len;
236
237 while (*p) {
238 if ((*p) == '@')
239 pa = p;
240 else if ((*p) == '/')
241 ps = p + 1;
242 p++;
243 }
244
245 if (pa < ps)
246 pa = p;
247 len = (pa - ps) + 1;
248 pp = unflatten_dt_alloc(mem, sizeof(struct property) + len,
249 __alignof__(struct property));
250 if (!dryrun) {
251 pp->name = "name";
252 pp->length = len;
253 pp->value = pp + 1;
254 *pprev = pp;
255 pprev = &pp->next;
256 memcpy(pp->value, ps, len - 1);
257 ((char *)pp->value)[len - 1] = 0;
258 pr_debug("fixed up name for %s -> %s\n",
259 nodename, (char *)pp->value);
260 }
261 }
262
263 if (!dryrun)
264 *pprev = NULL;
265}
266
Gavin Shandddc33e2016-05-13 21:31:39 +1000267static unsigned int populate_node(const void *blob,
268 int offset,
269 void **mem,
270 struct device_node *dad,
271 unsigned int fpsize,
272 struct device_node **pnp,
273 bool dryrun)
Gavin Shandfbd4c62016-05-03 23:22:47 +1000274{
Grant Likelybbd33932009-11-23 20:07:00 -0700275 struct device_node *np;
Rob Herringe6a69282014-04-02 15:10:14 -0500276 const char *pathp;
Grant Likelybbd33932009-11-23 20:07:00 -0700277 unsigned int l, allocl;
Grant Likelybbd33932009-11-23 20:07:00 -0700278 int new_format = 0;
279
Gavin Shandfbd4c62016-05-03 23:22:47 +1000280 pathp = fdt_get_name(blob, offset, &l);
281 if (!pathp) {
282 *pnp = NULL;
283 return 0;
284 }
Rob Herringe6a69282014-04-02 15:10:14 -0500285
Ricky Liang05f46472015-04-14 12:36:05 +0800286 allocl = ++l;
Grant Likelybbd33932009-11-23 20:07:00 -0700287
288 /* version 0x10 has a more compact unit name here instead of the full
289 * path. we accumulate the full path size using "fpsize", we'll rebuild
290 * it later. We detect this because the first character of the name is
291 * not '/'.
292 */
293 if ((*pathp) != '/') {
294 new_format = 1;
295 if (fpsize == 0) {
296 /* root node: special case. fpsize accounts for path
297 * plus terminating zero. root node only has '/', so
298 * fpsize should be 2, but we want to avoid the first
299 * level nodes to have two '/' so we use fpsize 1 here
300 */
301 fpsize = 1;
302 allocl = 2;
Catalin Marinas0fca5de2012-11-16 15:14:38 +0000303 l = 1;
Rob Herringe6a69282014-04-02 15:10:14 -0500304 pathp = "";
Grant Likelybbd33932009-11-23 20:07:00 -0700305 } else {
306 /* account for '/' and path size minus terminal 0
307 * already in 'l'
308 */
309 fpsize += l;
310 allocl = fpsize;
311 }
312 }
313
Gavin Shandfbd4c62016-05-03 23:22:47 +1000314 np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl,
Grant Likelybbd33932009-11-23 20:07:00 -0700315 __alignof__(struct device_node));
Grant Likely5063e252014-10-03 16:28:27 +0100316 if (!dryrun) {
Grant Likelyc22618a2012-11-14 22:37:12 +0000317 char *fn;
Pantelis Antoniou0829f6d2013-12-13 20:08:59 +0200318 of_node_init(np);
Grant Likelyc22618a2012-11-14 22:37:12 +0000319 np->full_name = fn = ((char *)np) + sizeof(*np);
Grant Likelybbd33932009-11-23 20:07:00 -0700320 if (new_format) {
Grant Likelybbd33932009-11-23 20:07:00 -0700321 /* rebuild full path for new format */
322 if (dad && dad->parent) {
323 strcpy(fn, dad->full_name);
324#ifdef DEBUG
325 if ((strlen(fn) + l + 1) != allocl) {
326 pr_debug("%s: p: %d, l: %d, a: %d\n",
327 pathp, (int)strlen(fn),
328 l, allocl);
329 }
330#endif
331 fn += strlen(fn);
332 }
333 *(fn++) = '/';
Grant Likelyc22618a2012-11-14 22:37:12 +0000334 }
335 memcpy(fn, pathp, l);
336
Grant Likelybbd33932009-11-23 20:07:00 -0700337 if (dad != NULL) {
338 np->parent = dad;
Grant Likely70161ff2014-11-28 16:03:33 +0000339 np->sibling = dad->child;
340 dad->child = np;
Grant Likelybbd33932009-11-23 20:07:00 -0700341 }
Grant Likelybbd33932009-11-23 20:07:00 -0700342 }
Grant Likelybbd33932009-11-23 20:07:00 -0700343
Gavin Shandfbd4c62016-05-03 23:22:47 +1000344 populate_properties(blob, offset, mem, np, pathp, dryrun);
Grant Likely5063e252014-10-03 16:28:27 +0100345 if (!dryrun) {
Grant Likelybbd33932009-11-23 20:07:00 -0700346 np->name = of_get_property(np, "name", NULL);
347 np->type = of_get_property(np, "device_type", NULL);
348
349 if (!np->name)
350 np->name = "<NULL>";
351 if (!np->type)
352 np->type = "<NULL>";
353 }
Rob Herringe6a69282014-04-02 15:10:14 -0500354
Gavin Shandfbd4c62016-05-03 23:22:47 +1000355 *pnp = np;
356 return fpsize;
357}
358
Gavin Shan50800082016-05-03 23:22:48 +1000359static void reverse_nodes(struct device_node *parent)
360{
361 struct device_node *child, *next;
362
363 /* In-depth first */
364 child = parent->child;
365 while (child) {
366 reverse_nodes(child);
367
368 child = child->sibling;
369 }
370
371 /* Reverse the nodes in the child list */
372 child = parent->child;
373 parent->child = NULL;
374 while (child) {
375 next = child->sibling;
376
377 child->sibling = parent->child;
378 parent->child = child;
379 child = next;
380 }
381}
382
Gavin Shandfbd4c62016-05-03 23:22:47 +1000383/**
Gavin Shan947c82c2016-05-03 23:22:49 +1000384 * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree
Gavin Shandfbd4c62016-05-03 23:22:47 +1000385 * @blob: The parent device tree blob
386 * @mem: Memory chunk to use for allocating device nodes and properties
Gavin Shandfbd4c62016-05-03 23:22:47 +1000387 * @dad: Parent struct device_node
388 * @nodepp: The device_node tree created by the call
Gavin Shan50800082016-05-03 23:22:48 +1000389 *
390 * It returns the size of unflattened device tree or error code
Gavin Shandfbd4c62016-05-03 23:22:47 +1000391 */
Gavin Shan947c82c2016-05-03 23:22:49 +1000392static int unflatten_dt_nodes(const void *blob,
393 void *mem,
394 struct device_node *dad,
395 struct device_node **nodepp)
Gavin Shandfbd4c62016-05-03 23:22:47 +1000396{
Gavin Shan50800082016-05-03 23:22:48 +1000397 struct device_node *root;
Gavin Shan8c237cd2016-06-09 15:50:49 +1000398 int offset = 0, depth = 0, initial_depth = 0;
Gavin Shan50800082016-05-03 23:22:48 +1000399#define FDT_MAX_DEPTH 64
Gavin Shandddc33e2016-05-13 21:31:39 +1000400 unsigned int fpsizes[FDT_MAX_DEPTH];
Gavin Shan50800082016-05-03 23:22:48 +1000401 struct device_node *nps[FDT_MAX_DEPTH];
402 void *base = mem;
403 bool dryrun = !base;
Gavin Shandfbd4c62016-05-03 23:22:47 +1000404
Gavin Shan50800082016-05-03 23:22:48 +1000405 if (nodepp)
406 *nodepp = NULL;
Gavin Shandfbd4c62016-05-03 23:22:47 +1000407
Gavin Shan8c237cd2016-06-09 15:50:49 +1000408 /*
409 * We're unflattening device sub-tree if @dad is valid. There are
410 * possibly multiple nodes in the first level of depth. We need
411 * set @depth to 1 to make fdt_next_node() happy as it bails
412 * immediately when negative @depth is found. Otherwise, the device
413 * nodes except the first one won't be unflattened successfully.
414 */
415 if (dad)
416 depth = initial_depth = 1;
417
Gavin Shan50800082016-05-03 23:22:48 +1000418 root = dad;
419 fpsizes[depth] = dad ? strlen(of_node_full_name(dad)) : 0;
Rhyland Klein78c44d92016-05-11 13:36:57 -0400420 nps[depth] = dad;
Gavin Shan8c237cd2016-06-09 15:50:49 +1000421
Gavin Shan50800082016-05-03 23:22:48 +1000422 for (offset = 0;
Gavin Shan8c237cd2016-06-09 15:50:49 +1000423 offset >= 0 && depth >= initial_depth;
Gavin Shan50800082016-05-03 23:22:48 +1000424 offset = fdt_next_node(blob, offset, &depth)) {
425 if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH))
426 continue;
Rob Herringe6a69282014-04-02 15:10:14 -0500427
Rhyland Klein78c44d92016-05-11 13:36:57 -0400428 fpsizes[depth+1] = populate_node(blob, offset, &mem,
429 nps[depth],
430 fpsizes[depth],
431 &nps[depth+1], dryrun);
432 if (!fpsizes[depth+1])
Gavin Shan50800082016-05-03 23:22:48 +1000433 return mem - base;
434
435 if (!dryrun && nodepp && !*nodepp)
Rhyland Klein78c44d92016-05-11 13:36:57 -0400436 *nodepp = nps[depth+1];
Gavin Shan50800082016-05-03 23:22:48 +1000437 if (!dryrun && !root)
Rhyland Klein78c44d92016-05-11 13:36:57 -0400438 root = nps[depth+1];
Gavin Shan50800082016-05-03 23:22:48 +1000439 }
440
441 if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
Rob Herring606ad422016-06-15 08:32:18 -0500442 pr_err("Error %d processing FDT\n", offset);
Gavin Shan50800082016-05-03 23:22:48 +1000443 return -EINVAL;
444 }
Rob Herringe6a69282014-04-02 15:10:14 -0500445
Grant Likely70161ff2014-11-28 16:03:33 +0000446 /*
447 * Reverse the child list. Some drivers assumes node order matches .dts
448 * node order
449 */
Gavin Shan50800082016-05-03 23:22:48 +1000450 if (!dryrun)
451 reverse_nodes(root);
Grant Likely70161ff2014-11-28 16:03:33 +0000452
Gavin Shan50800082016-05-03 23:22:48 +1000453 return mem - base;
Grant Likelybbd33932009-11-23 20:07:00 -0700454}
Grant Likely41f88002009-11-23 20:07:01 -0700455
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800456/**
457 * __unflatten_device_tree - create tree of device_nodes from flat blob
458 *
459 * unflattens a device-tree, creating the
460 * tree of struct device_node. It also fills the "name" and "type"
461 * pointers of the nodes so the normal device-tree walking functions
462 * can be used.
463 * @blob: The blob to expand
Gavin Shanc4263232016-05-03 23:22:50 +1000464 * @dad: Parent device node
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800465 * @mynodes: The device_node tree created by the call
466 * @dt_alloc: An allocator that provides a virtual address to memory
467 * for the resulting tree
Gavin Shan83262412016-05-03 23:22:51 +1000468 *
469 * Returns NULL on failure or the memory chunk containing the unflattened
470 * device tree on success.
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800471 */
Gavin Shan83262412016-05-03 23:22:51 +1000472static void *__unflatten_device_tree(const void *blob,
473 struct device_node *dad,
474 struct device_node **mynodes,
Michal Suchanek1d1bde52016-07-19 00:01:12 +0200475 void *(*dt_alloc)(u64 size, u64 align),
476 bool detached)
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800477{
Gavin Shan50800082016-05-03 23:22:48 +1000478 int size;
Rob Herringe6a69282014-04-02 15:10:14 -0500479 void *mem;
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800480
481 pr_debug(" -> unflatten_device_tree()\n");
482
483 if (!blob) {
484 pr_debug("No device tree pointer\n");
Gavin Shan83262412016-05-03 23:22:51 +1000485 return NULL;
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800486 }
487
488 pr_debug("Unflattening device tree:\n");
Rob Herringc972de12014-04-01 22:48:01 -0500489 pr_debug("magic: %08x\n", fdt_magic(blob));
490 pr_debug("size: %08x\n", fdt_totalsize(blob));
491 pr_debug("version: %08x\n", fdt_version(blob));
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800492
Rob Herringc972de12014-04-01 22:48:01 -0500493 if (fdt_check_header(blob)) {
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800494 pr_err("Invalid device tree blob header\n");
Gavin Shan83262412016-05-03 23:22:51 +1000495 return NULL;
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800496 }
497
498 /* First pass, scan for size */
Gavin Shanc4263232016-05-03 23:22:50 +1000499 size = unflatten_dt_nodes(blob, NULL, dad, NULL);
Gavin Shan50800082016-05-03 23:22:48 +1000500 if (size < 0)
Gavin Shan83262412016-05-03 23:22:51 +1000501 return NULL;
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800502
Gavin Shan50800082016-05-03 23:22:48 +1000503 size = ALIGN(size, 4);
504 pr_debug(" size is %d, allocating...\n", size);
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800505
506 /* Allocate memory for the expanded device tree */
Grant Likely44856812013-08-29 13:30:35 +0100507 mem = dt_alloc(size + 4, __alignof__(struct device_node));
508 memset(mem, 0, size);
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800509
Grant Likely44856812013-08-29 13:30:35 +0100510 *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
Wladislav Wiebe9e401272013-08-12 13:06:53 +0200511
Grant Likely44856812013-08-29 13:30:35 +0100512 pr_debug(" unflattening %p...\n", mem);
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800513
514 /* Second pass, do actual unflattening */
Gavin Shanc4263232016-05-03 23:22:50 +1000515 unflatten_dt_nodes(blob, mem, dad, mynodes);
Grant Likely44856812013-08-29 13:30:35 +0100516 if (be32_to_cpup(mem + size) != 0xdeadbeef)
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800517 pr_warning("End of tree marker overwritten: %08x\n",
Grant Likely44856812013-08-29 13:30:35 +0100518 be32_to_cpup(mem + size));
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800519
Gavin Shan89c67752016-08-01 17:17:53 +1000520 if (detached && mynodes) {
Michal Suchanek1d1bde52016-07-19 00:01:12 +0200521 of_node_set_flag(*mynodes, OF_DETACHED);
522 pr_debug("unflattened tree is detached\n");
523 }
524
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800525 pr_debug(" <- unflatten_device_tree()\n");
Gavin Shan83262412016-05-03 23:22:51 +1000526 return mem;
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800527}
528
529static void *kernel_tree_alloc(u64 size, u64 align)
530{
531 return kzalloc(size, GFP_KERNEL);
532}
533
Guenter Roeckf8062382015-12-05 16:13:53 -0800534static DEFINE_MUTEX(of_fdt_unflatten_mutex);
535
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800536/**
537 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
Gavin Shanc4263232016-05-03 23:22:50 +1000538 * @blob: Flat device tree blob
539 * @dad: Parent device node
540 * @mynodes: The device tree created by the call
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800541 *
542 * unflattens the device-tree passed by the firmware, creating the
543 * tree of struct device_node. It also fills the "name" and "type"
544 * pointers of the nodes so the normal device-tree walking functions
545 * can be used.
Gavin Shan83262412016-05-03 23:22:51 +1000546 *
547 * Returns NULL on failure or the memory chunk containing the unflattened
548 * device tree on success.
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800549 */
Gavin Shan83262412016-05-03 23:22:51 +1000550void *of_fdt_unflatten_tree(const unsigned long *blob,
551 struct device_node *dad,
552 struct device_node **mynodes)
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800553{
Gavin Shan83262412016-05-03 23:22:51 +1000554 void *mem;
555
Guenter Roeckf8062382015-12-05 16:13:53 -0800556 mutex_lock(&of_fdt_unflatten_mutex);
Michal Suchanek1d1bde52016-07-19 00:01:12 +0200557 mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc,
558 true);
Guenter Roeckf8062382015-12-05 16:13:53 -0800559 mutex_unlock(&of_fdt_unflatten_mutex);
Gavin Shan83262412016-05-03 23:22:51 +1000560
561 return mem;
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800562}
563EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
564
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800565/* Everything below here references initial_boot_params directly. */
566int __initdata dt_root_addr_cells;
567int __initdata dt_root_size_cells;
568
Rob Herring1daa0c42014-03-31 15:25:04 -0500569void *initial_boot_params;
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800570
571#ifdef CONFIG_OF_EARLY_FLATTREE
572
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +0100573static u32 of_fdt_crc32;
574
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800575/**
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100576 * res_mem_reserve_reg() - reserve all memory described in 'reg' property
577 */
578static int __init __reserved_mem_reserve_reg(unsigned long node,
579 const char *uname)
580{
581 int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
582 phys_addr_t base, size;
Rob Herring9d0c4df2014-04-01 23:49:03 -0500583 int len;
584 const __be32 *prop;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100585 int nomap, first = 1;
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100586
587 prop = of_get_flat_dt_prop(node, "reg", &len);
588 if (!prop)
589 return -ENOENT;
590
591 if (len && len % t_len != 0) {
592 pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
593 uname);
594 return -EINVAL;
595 }
596
597 nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
598
599 while (len >= t_len) {
600 base = dt_mem_next_cell(dt_root_addr_cells, &prop);
601 size = dt_mem_next_cell(dt_root_size_cells, &prop);
602
Al Cooperb5f2a8c2014-08-06 16:30:04 -0400603 if (size &&
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100604 early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
605 pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
606 uname, &base, (unsigned long)size / SZ_1M);
607 else
608 pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
609 uname, &base, (unsigned long)size / SZ_1M);
610
611 len -= t_len;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100612 if (first) {
613 fdt_reserved_mem_save_node(node, uname, base, size);
614 first = 0;
615 }
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100616 }
617 return 0;
618}
619
620/**
621 * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
622 * in /reserved-memory matches the values supported by the current implementation,
623 * also check if ranges property has been provided
624 */
Xiubo Li5b624112014-04-08 13:48:07 +0800625static int __init __reserved_mem_check_root(unsigned long node)
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100626{
Rob Herring9d0c4df2014-04-01 23:49:03 -0500627 const __be32 *prop;
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100628
629 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
630 if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
631 return -EINVAL;
632
633 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
634 if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
635 return -EINVAL;
636
637 prop = of_get_flat_dt_prop(node, "ranges", NULL);
638 if (!prop)
639 return -EINVAL;
640 return 0;
641}
642
643/**
644 * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
645 */
646static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
647 int depth, void *data)
648{
649 static int found;
650 const char *status;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100651 int err;
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100652
653 if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
654 if (__reserved_mem_check_root(node) != 0) {
655 pr_err("Reserved memory: unsupported node format, ignoring\n");
656 /* break scan */
657 return 1;
658 }
659 found = 1;
660 /* scan next node */
661 return 0;
662 } else if (!found) {
663 /* scan next node */
664 return 0;
665 } else if (found && depth < 2) {
666 /* scanning of /reserved-memory has been finished */
667 return 1;
668 }
669
670 status = of_get_flat_dt_prop(node, "status", NULL);
671 if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
672 return 0;
673
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100674 err = __reserved_mem_reserve_reg(node, uname);
675 if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
676 fdt_reserved_mem_save_node(node, uname, 0, 0);
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100677
678 /* scan next node */
679 return 0;
680}
681
682/**
683 * early_init_fdt_scan_reserved_mem() - create reserved memory regions
684 *
685 * This function grabs memory from early allocator for device exclusive use
686 * defined in device tree structures. It should be called by arch specific code
687 * once the early allocator (i.e. memblock) has been fully activated.
688 */
689void __init early_init_fdt_scan_reserved_mem(void)
690{
Rob Herringd1552ce2014-04-01 22:46:48 -0500691 int n;
692 u64 base, size;
693
Josh Cartwright2040b522014-03-13 16:36:36 -0500694 if (!initial_boot_params)
695 return;
696
Rob Herringd1552ce2014-04-01 22:46:48 -0500697 /* Process header /memreserve/ fields */
698 for (n = 0; ; n++) {
699 fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
700 if (!size)
701 break;
702 early_init_dt_reserve_memory_arch(base, size, 0);
703 }
704
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100705 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100706 fdt_init_reserved_mem();
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100707}
708
709/**
Ard Biesheuvel24bbd922015-06-01 13:40:31 +0200710 * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob
711 */
712void __init early_init_fdt_reserve_self(void)
713{
714 if (!initial_boot_params)
715 return;
716
717 /* Reserve the dtb region */
718 early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
719 fdt_totalsize(initial_boot_params),
720 0);
721}
722
723/**
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800724 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
725 * @it: callback function
726 * @data: context data pointer
727 *
728 * This function is used to scan the flattened device-tree, it is
729 * used to extract the memory information at boot before we can
730 * unflatten the tree
731 */
732int __init of_scan_flat_dt(int (*it)(unsigned long node,
733 const char *uname, int depth,
734 void *data),
735 void *data)
736{
Rob Herringe6a69282014-04-02 15:10:14 -0500737 const void *blob = initial_boot_params;
738 const char *pathp;
739 int offset, rc = 0, depth = -1;
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800740
Rob Herringe6a69282014-04-02 15:10:14 -0500741 for (offset = fdt_next_node(blob, -1, &depth);
742 offset >= 0 && depth >= 0 && !rc;
743 offset = fdt_next_node(blob, offset, &depth)) {
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800744
Rob Herringe6a69282014-04-02 15:10:14 -0500745 pathp = fdt_get_name(blob, offset, NULL);
Andy Shevchenko375da3a2012-12-17 16:01:28 -0800746 if (*pathp == '/')
747 pathp = kbasename(pathp);
Rob Herringe6a69282014-04-02 15:10:14 -0500748 rc = it(offset, pathp, depth, data);
749 }
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800750 return rc;
751}
752
753/**
Shannon Zhao9c609862016-04-07 20:03:33 +0800754 * of_get_flat_dt_subnode_by_name - get the subnode by given name
755 *
756 * @node: the parent node
757 * @uname: the name of subnode
758 * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
759 */
760
761int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
762{
763 return fdt_subnode_offset(initial_boot_params, node, uname);
764}
765
766/**
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800767 * of_get_flat_dt_root - find the root node in the flat blob
768 */
769unsigned long __init of_get_flat_dt_root(void)
770{
Rob Herringe6a69282014-04-02 15:10:14 -0500771 return 0;
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800772}
773
774/**
Rob Herringc0556d32014-04-22 12:55:10 -0500775 * of_get_flat_dt_size - Return the total size of the FDT
776 */
777int __init of_get_flat_dt_size(void)
778{
779 return fdt_totalsize(initial_boot_params);
780}
781
782/**
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800783 * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
784 *
785 * This function can be used within scan_flattened_dt callback to get
786 * access to properties
787 */
Rob Herring9d0c4df2014-04-01 23:49:03 -0500788const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
789 int *size)
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800790{
Rob Herringe6a69282014-04-02 15:10:14 -0500791 return fdt_getprop(initial_boot_params, node, name, size);
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800792}
793
794/**
795 * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
796 * @node: node to test
797 * @compat: compatible string to compare with compatible list.
798 */
799int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
800{
801 return of_fdt_is_compatible(initial_boot_params, node, compat);
802}
803
Grant Likelya4f740c2010-10-30 11:49:09 -0400804/**
805 * of_flat_dt_match - Return true if node matches a list of compatible values
806 */
Uwe Kleine-König7b482c82011-12-20 22:56:45 +0100807int __init of_flat_dt_match(unsigned long node, const char *const *compat)
Grant Likelya4f740c2010-10-30 11:49:09 -0400808{
809 return of_fdt_match(initial_boot_params, node, compat);
810}
811
Marek Szyprowski57d74bc2013-08-26 14:41:56 +0200812struct fdt_scan_status {
813 const char *name;
814 int namelen;
815 int depth;
816 int found;
817 int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
818 void *data;
819};
820
Rob Herring6a903a22013-08-27 21:41:56 -0500821const char * __init of_flat_dt_get_machine_name(void)
822{
823 const char *name;
824 unsigned long dt_root = of_get_flat_dt_root();
825
826 name = of_get_flat_dt_prop(dt_root, "model", NULL);
827 if (!name)
828 name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
829 return name;
830}
831
832/**
833 * of_flat_dt_match_machine - Iterate match tables to find matching machine.
834 *
835 * @default_match: A machine specific ptr to return in case of no match.
836 * @get_next_compat: callback function to return next compatible match table.
837 *
838 * Iterate through machine match tables to find the best match for the machine
839 * compatible string in the FDT.
840 */
841const void * __init of_flat_dt_match_machine(const void *default_match,
842 const void * (*get_next_compat)(const char * const**))
843{
844 const void *data = NULL;
845 const void *best_data = default_match;
846 const char *const *compat;
847 unsigned long dt_root;
848 unsigned int best_score = ~1, score = 0;
849
850 dt_root = of_get_flat_dt_root();
851 while ((data = get_next_compat(&compat))) {
852 score = of_flat_dt_match(dt_root, compat);
853 if (score > 0 && score < best_score) {
854 best_data = data;
855 best_score = score;
856 }
857 }
858 if (!best_data) {
859 const char *prop;
Rob Herring9d0c4df2014-04-01 23:49:03 -0500860 int size;
Rob Herring6a903a22013-08-27 21:41:56 -0500861
862 pr_err("\n unrecognized device tree list:\n[ ");
863
864 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
865 if (prop) {
866 while (size > 0) {
867 printk("'%s' ", prop);
868 size -= strlen(prop) + 1;
869 prop += strlen(prop) + 1;
870 }
871 }
872 printk("]\n\n");
873 return NULL;
874 }
875
876 pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
877
878 return best_data;
879}
880
Grant Likelyf7b3a832009-11-24 03:26:58 -0700881#ifdef CONFIG_BLK_DEV_INITRD
Ard Biesheuvel369bc9a2016-02-16 13:52:33 +0100882#ifndef __early_init_dt_declare_initrd
883static void __early_init_dt_declare_initrd(unsigned long start,
884 unsigned long end)
885{
886 initrd_start = (unsigned long)__va(start);
887 initrd_end = (unsigned long)__va(end);
888 initrd_below_start_ok = 1;
889}
890#endif
891
Grant Likelyf7b3a832009-11-24 03:26:58 -0700892/**
893 * early_init_dt_check_for_initrd - Decode initrd location from flat tree
894 * @node: reference to node containing initrd location ('chosen')
895 */
Rob Herring29eb45a2013-08-30 17:06:53 -0500896static void __init early_init_dt_check_for_initrd(unsigned long node)
Grant Likelyf7b3a832009-11-24 03:26:58 -0700897{
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400898 u64 start, end;
Rob Herring9d0c4df2014-04-01 23:49:03 -0500899 int len;
900 const __be32 *prop;
Grant Likelyf7b3a832009-11-24 03:26:58 -0700901
902 pr_debug("Looking for initrd properties... ");
903
904 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700905 if (!prop)
906 return;
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400907 start = of_read_number(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700908
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700909 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
910 if (!prop)
911 return;
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400912 end = of_read_number(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700913
Ard Biesheuvel369bc9a2016-02-16 13:52:33 +0100914 __early_init_dt_declare_initrd(start, end);
Rob Herring29eb45a2013-08-30 17:06:53 -0500915
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400916 pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
917 (unsigned long long)start, (unsigned long long)end);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700918}
919#else
Rob Herring29eb45a2013-08-30 17:06:53 -0500920static inline void early_init_dt_check_for_initrd(unsigned long node)
Grant Likelyf7b3a832009-11-24 03:26:58 -0700921{
922}
923#endif /* CONFIG_BLK_DEV_INITRD */
924
Rob Herringfb11ffe2014-03-27 08:07:01 -0500925#ifdef CONFIG_SERIAL_EARLYCON
Rob Herringfb11ffe2014-03-27 08:07:01 -0500926
Lad, Prabhakar523bf172015-02-04 12:04:06 +0000927static int __init early_init_dt_scan_chosen_serial(void)
Rob Herringfb11ffe2014-03-27 08:07:01 -0500928{
929 int offset;
Peter Hurley4d118c92016-01-16 15:23:42 -0800930 const char *p, *q, *options = NULL;
Rob Herringfb11ffe2014-03-27 08:07:01 -0500931 int l;
Peter Hurley2eaa7902016-01-16 15:23:39 -0800932 const struct earlycon_id *match;
Rob Herringfb11ffe2014-03-27 08:07:01 -0500933 const void *fdt = initial_boot_params;
934
935 offset = fdt_path_offset(fdt, "/chosen");
936 if (offset < 0)
937 offset = fdt_path_offset(fdt, "/chosen@0");
938 if (offset < 0)
939 return -ENOENT;
940
941 p = fdt_getprop(fdt, offset, "stdout-path", &l);
942 if (!p)
943 p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);
944 if (!p || !l)
945 return -ENOENT;
946
Peter Hurley4d118c92016-01-16 15:23:42 -0800947 q = strchrnul(p, ':');
948 if (*q != '\0')
949 options = q + 1;
Peter Hurley0fcc2862016-01-16 15:23:48 -0800950 l = q - p;
Stefan Agner6296ad92015-10-10 01:29:30 -0700951
Rob Herringfb11ffe2014-03-27 08:07:01 -0500952 /* Get the node specified by stdout-path */
Peter Hurley0fcc2862016-01-16 15:23:48 -0800953 offset = fdt_path_offset_namelen(fdt, p, l);
954 if (offset < 0) {
955 pr_warn("earlycon: stdout-path %.*s not found\n", l, p);
956 return 0;
957 }
Rob Herringfb11ffe2014-03-27 08:07:01 -0500958
Peter Hurley2eaa7902016-01-16 15:23:39 -0800959 for (match = __earlycon_table; match < __earlycon_table_end; match++) {
Peter Hurley2eaa7902016-01-16 15:23:39 -0800960 if (!match->compatible[0])
Rob Herringfb11ffe2014-03-27 08:07:01 -0500961 continue;
Peter Hurley2eaa7902016-01-16 15:23:39 -0800962
963 if (fdt_node_check_compatible(fdt, offset, match->compatible))
964 continue;
Rob Herringfb11ffe2014-03-27 08:07:01 -0500965
Peter Hurleyc90fe9c2016-01-16 15:23:44 -0800966 of_setup_earlycon(match, offset, options);
Rob Herringfb11ffe2014-03-27 08:07:01 -0500967 return 0;
968 }
969 return -ENODEV;
970}
971
972static int __init setup_of_earlycon(char *buf)
973{
974 if (buf)
975 return 0;
976
977 return early_init_dt_scan_chosen_serial();
978}
979early_param("earlycon", setup_of_earlycon);
980#endif
981
Grant Likely41f88002009-11-23 20:07:01 -0700982/**
Grant Likelyf00abd92009-11-24 03:27:10 -0700983 * early_init_dt_scan_root - fetch the top level address and size cells
984 */
985int __init early_init_dt_scan_root(unsigned long node, const char *uname,
986 int depth, void *data)
987{
Rob Herring9d0c4df2014-04-01 23:49:03 -0500988 const __be32 *prop;
Grant Likelyf00abd92009-11-24 03:27:10 -0700989
990 if (depth != 0)
991 return 0;
992
Jeremy Kerr33714882010-01-30 01:45:26 -0700993 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
994 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
995
Grant Likelyf00abd92009-11-24 03:27:10 -0700996 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -0700997 if (prop)
998 dt_root_size_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -0700999 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
1000
1001 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -07001002 if (prop)
1003 dt_root_addr_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -07001004 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
1005
1006 /* break now */
1007 return 1;
1008}
1009
Rob Herring9d0c4df2014-04-01 23:49:03 -05001010u64 __init dt_mem_next_cell(int s, const __be32 **cellp)
Grant Likely83f7a062009-11-24 03:37:56 -07001011{
Rob Herring9d0c4df2014-04-01 23:49:03 -05001012 const __be32 *p = *cellp;
Grant Likely83f7a062009-11-24 03:37:56 -07001013
1014 *cellp = p + s;
1015 return of_read_number(p, s);
1016}
1017
Grant Likely51975db2010-02-01 21:34:14 -07001018/**
1019 * early_init_dt_scan_memory - Look for an parse memory nodes
1020 */
1021int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
1022 int depth, void *data)
1023{
Rob Herring9d0c4df2014-04-01 23:49:03 -05001024 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
1025 const __be32 *reg, *endp;
1026 int l;
Grant Likely51975db2010-02-01 21:34:14 -07001027
1028 /* We are scanning "memory" nodes only */
1029 if (type == NULL) {
1030 /*
1031 * The longtrail doesn't have a device_type on the
1032 * /memory node, so look for the node called /memory@0.
1033 */
Leif Lindholmb44aa252014-04-17 18:42:01 +01001034 if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0)
Grant Likely51975db2010-02-01 21:34:14 -07001035 return 0;
1036 } else if (strcmp(type, "memory") != 0)
1037 return 0;
1038
1039 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
1040 if (reg == NULL)
1041 reg = of_get_flat_dt_prop(node, "reg", &l);
1042 if (reg == NULL)
1043 return 0;
1044
1045 endp = reg + (l / sizeof(__be32));
1046
Florian Fainellic954b362015-04-12 13:16:26 -07001047 pr_debug("memory scan node %s, reg size %d,\n", uname, l);
Grant Likely51975db2010-02-01 21:34:14 -07001048
1049 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
1050 u64 base, size;
1051
1052 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
1053 size = dt_mem_next_cell(dt_root_size_cells, &reg);
1054
1055 if (size == 0)
1056 continue;
1057 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
1058 (unsigned long long)size);
1059
1060 early_init_dt_add_memory_arch(base, size);
1061 }
1062
1063 return 0;
1064}
1065
Grant Likely86e03222009-12-10 23:42:21 -07001066int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
1067 int depth, void *data)
1068{
Rob Herring9d0c4df2014-04-01 23:49:03 -05001069 int l;
1070 const char *p;
Grant Likely86e03222009-12-10 23:42:21 -07001071
1072 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
1073
Grant Likely85f60ae2011-04-29 00:18:16 -06001074 if (depth != 1 || !data ||
Grant Likely86e03222009-12-10 23:42:21 -07001075 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
1076 return 0;
1077
1078 early_init_dt_check_for_initrd(node);
1079
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001080 /* Retrieve command line */
Grant Likely86e03222009-12-10 23:42:21 -07001081 p = of_get_flat_dt_prop(node, "bootargs", &l);
1082 if (p != NULL && l > 0)
Grant Likely85f60ae2011-04-29 00:18:16 -06001083 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
Grant Likely86e03222009-12-10 23:42:21 -07001084
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +00001085 /*
1086 * CONFIG_CMDLINE is meant to be a default in case nothing else
1087 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
1088 * is set in which case we override whatever was found earlier.
1089 */
Grant Likely86e03222009-12-10 23:42:21 -07001090#ifdef CONFIG_CMDLINE
Max Uvarov34b82022016-04-13 12:52:16 +03001091#if defined(CONFIG_CMDLINE_EXTEND)
1092 strlcat(data, " ", COMMAND_LINE_SIZE);
1093 strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
1094#elif defined(CONFIG_CMDLINE_FORCE)
1095 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
1096#else
1097 /* No arguments from boot loader, use kernel's cmdl*/
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +00001098 if (!((char *)data)[0])
Grant Likely85f60ae2011-04-29 00:18:16 -06001099 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
Max Uvarov34b82022016-04-13 12:52:16 +03001100#endif
Grant Likely86e03222009-12-10 23:42:21 -07001101#endif /* CONFIG_CMDLINE */
1102
Grant Likely85f60ae2011-04-29 00:18:16 -06001103 pr_debug("Command line is: %s\n", (char*)data);
Grant Likely86e03222009-12-10 23:42:21 -07001104
1105 /* break now */
1106 return 1;
1107}
1108
Grant Likelya1727da2013-08-28 21:18:32 +01001109#ifdef CONFIG_HAVE_MEMBLOCK
Ard Biesheuvel270522a2016-02-16 13:52:32 +01001110#ifndef MIN_MEMBLOCK_ADDR
1111#define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET)
1112#endif
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +01001113#ifndef MAX_MEMBLOCK_ADDR
1114#define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0)
1115#endif
Laura Abbott3069f0c2014-07-07 17:45:43 -07001116
Rob Herring068f6312013-09-24 22:20:01 -05001117void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
1118{
Ard Biesheuvel270522a2016-02-16 13:52:32 +01001119 const u64 phys_offset = MIN_MEMBLOCK_ADDR;
Geert Uytterhoeven8f73d4b2014-08-20 17:10:31 +02001120
1121 if (!PAGE_ALIGNED(base)) {
Ard Biesheuvel8cccffc2014-10-29 17:09:32 +01001122 if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
1123 pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
1124 base, base + size);
1125 return;
1126 }
Geert Uytterhoeven8f73d4b2014-08-20 17:10:31 +02001127 size -= PAGE_SIZE - (base & ~PAGE_MASK);
1128 base = PAGE_ALIGN(base);
1129 }
Rob Herring068f6312013-09-24 22:20:01 -05001130 size &= PAGE_MASK;
Laura Abbotta67a6ed2014-06-19 20:13:38 -07001131
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +01001132 if (base > MAX_MEMBLOCK_ADDR) {
Laura Abbott3069f0c2014-07-07 17:45:43 -07001133 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
1134 base, base + size);
1135 return;
1136 }
Laura Abbotta67a6ed2014-06-19 20:13:38 -07001137
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +01001138 if (base + size - 1 > MAX_MEMBLOCK_ADDR) {
Srinivas Kandagatla9aacd602014-09-23 10:59:09 +01001139 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +01001140 ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size);
1141 size = MAX_MEMBLOCK_ADDR - base + 1;
Laura Abbotta67a6ed2014-06-19 20:13:38 -07001142 }
1143
Rob Herring068f6312013-09-24 22:20:01 -05001144 if (base + size < phys_offset) {
1145 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
1146 base, base + size);
1147 return;
1148 }
1149 if (base < phys_offset) {
1150 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
1151 base, phys_offset);
1152 size -= phys_offset - base;
1153 base = phys_offset;
1154 }
1155 memblock_add(base, size);
1156}
1157
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001158int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
1159 phys_addr_t size, bool nomap)
1160{
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001161 if (nomap)
1162 return memblock_remove(base, size);
1163 return memblock_reserve(base, size);
1164}
1165
Grant Likelya1727da2013-08-28 21:18:32 +01001166/*
1167 * called from unflatten_device_tree() to bootstrap devicetree itself
1168 * Architectures can override this definition if memblock isn't used
1169 */
1170void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
1171{
1172 return __va(memblock_alloc(size, align));
1173}
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001174#else
Rob Herringaefc7ec2015-06-18 20:35:46 -05001175void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
1176{
1177 WARN_ON(1);
1178}
1179
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001180int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
1181 phys_addr_t size, bool nomap)
1182{
Dmitry V. Krivenok78bb2ab2015-11-30 23:45:48 +03001183 pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n",
Rob Herring1d1a6612014-04-22 12:50:24 -05001184 &base, &size, nomap ? " (nomap)" : "");
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001185 return -ENOSYS;
1186}
Rob Herringaefc7ec2015-06-18 20:35:46 -05001187
1188void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
1189{
1190 WARN_ON(1);
1191 return NULL;
1192}
Grant Likelya1727da2013-08-28 21:18:32 +01001193#endif
1194
Laura Abbott4972a742014-07-15 10:03:34 -07001195bool __init early_init_dt_verify(void *params)
Rob Herring0288ffcb2013-08-26 09:47:40 -05001196{
1197 if (!params)
1198 return false;
1199
Bjorn Helgaas50ba08f2014-10-29 12:15:00 -06001200 /* check device tree validity */
1201 if (fdt_check_header(params))
1202 return false;
1203
Rob Herring0288ffcb2013-08-26 09:47:40 -05001204 /* Setup flat device-tree pointer */
1205 initial_boot_params = params;
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001206 of_fdt_crc32 = crc32_be(~0, initial_boot_params,
1207 fdt_totalsize(initial_boot_params));
Laura Abbott4972a742014-07-15 10:03:34 -07001208 return true;
1209}
1210
1211
1212void __init early_init_dt_scan_nodes(void)
1213{
Rob Herring0288ffcb2013-08-26 09:47:40 -05001214 /* Retrieve various information from the /chosen node */
1215 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
1216
1217 /* Initialize {size,address}-cells info */
1218 of_scan_flat_dt(early_init_dt_scan_root, NULL);
1219
1220 /* Setup memory, calling early_init_dt_add_memory_arch */
1221 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
Laura Abbott4972a742014-07-15 10:03:34 -07001222}
Rob Herring0288ffcb2013-08-26 09:47:40 -05001223
Laura Abbott4972a742014-07-15 10:03:34 -07001224bool __init early_init_dt_scan(void *params)
1225{
1226 bool status;
1227
1228 status = early_init_dt_verify(params);
1229 if (!status)
1230 return false;
1231
1232 early_init_dt_scan_nodes();
Rob Herring0288ffcb2013-08-26 09:47:40 -05001233 return true;
1234}
1235
Grant Likelyf00abd92009-11-24 03:27:10 -07001236/**
Grant Likely41f88002009-11-23 20:07:01 -07001237 * unflatten_device_tree - create tree of device_nodes from flat blob
1238 *
1239 * unflattens the device-tree passed by the firmware, creating the
1240 * tree of struct device_node. It also fills the "name" and "type"
1241 * pointers of the nodes so the normal device-tree walking functions
1242 * can be used.
1243 */
1244void __init unflatten_device_tree(void)
1245{
Gavin Shanc4263232016-05-03 23:22:50 +10001246 __unflatten_device_tree(initial_boot_params, NULL, &of_root,
Michal Suchanek1d1bde52016-07-19 00:01:12 +02001247 early_init_dt_alloc_memory_arch, false);
Grant Likely41f88002009-11-23 20:07:01 -07001248
Robert P. J. Day4c7d6362013-05-30 05:38:08 -04001249 /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
Shawn Guo611cad72011-08-15 15:28:14 +08001250 of_alias_scan(early_init_dt_alloc_memory_arch);
Grant Likely41f88002009-11-23 20:07:01 -07001251}
Stephen Neuendorffere6ce1322010-11-18 15:54:56 -08001252
Rob Herringa8bf7522013-08-26 11:22:45 -05001253/**
1254 * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
1255 *
1256 * Copies and unflattens the device-tree passed by the firmware, creating the
1257 * tree of struct device_node. It also fills the "name" and "type"
1258 * pointers of the nodes so the normal device-tree walking functions
1259 * can be used. This should only be used when the FDT memory has not been
1260 * reserved such is the case when the FDT is built-in to the kernel init
1261 * section. If the FDT memory is reserved already then unflatten_device_tree
1262 * should be used instead.
1263 */
1264void __init unflatten_and_copy_device_tree(void)
1265{
James Hogan6f041e92013-11-21 13:44:14 +00001266 int size;
1267 void *dt;
1268
1269 if (!initial_boot_params) {
1270 pr_warn("No valid device tree found, continuing without\n");
1271 return;
1272 }
1273
Rob Herringc972de12014-04-01 22:48:01 -05001274 size = fdt_totalsize(initial_boot_params);
James Hogan6f041e92013-11-21 13:44:14 +00001275 dt = early_init_dt_alloc_memory_arch(size,
Rob Herringc972de12014-04-01 22:48:01 -05001276 roundup_pow_of_two(FDT_V17_SIZE));
Rob Herringa8bf7522013-08-26 11:22:45 -05001277
1278 if (dt) {
1279 memcpy(dt, initial_boot_params, size);
1280 initial_boot_params = dt;
1281 }
1282 unflatten_device_tree();
1283}
1284
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001285#ifdef CONFIG_SYSFS
1286static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj,
1287 struct bin_attribute *bin_attr,
1288 char *buf, loff_t off, size_t count)
Rob Herringb0a6fb32014-04-02 16:56:48 -05001289{
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001290 memcpy(buf, initial_boot_params + off, count);
1291 return count;
Rob Herringb0a6fb32014-04-02 16:56:48 -05001292}
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001293
1294static int __init of_fdt_raw_init(void)
1295{
1296 static struct bin_attribute of_fdt_raw_attr =
1297 __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0);
1298
1299 if (!initial_boot_params)
1300 return 0;
1301
1302 if (of_fdt_crc32 != crc32_be(~0, initial_boot_params,
1303 fdt_totalsize(initial_boot_params))) {
Rob Herring606ad422016-06-15 08:32:18 -05001304 pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n");
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001305 return 0;
1306 }
1307 of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params);
1308 return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr);
1309}
1310late_initcall(of_fdt_raw_init);
Rob Herringb0a6fb32014-04-02 16:56:48 -05001311#endif
1312
Stephen Neuendorffere6ce1322010-11-18 15:54:56 -08001313#endif /* CONFIG_OF_EARLY_FLATTREE */