blob: 3349d2aa66346335fa3c84e485668bdbf77f6e52 [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
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +010012#include <linux/crc32.h>
Grant Likely41f88002009-11-23 20:07:01 -070013#include <linux/kernel.h>
Grant Likelyf7b3a832009-11-24 03:26:58 -070014#include <linux/initrd.h>
Grant Likelya1727da2013-08-28 21:18:32 +010015#include <linux/memblock.h>
Guenter Roeckf8062382015-12-05 16:13:53 -080016#include <linux/mutex.h>
Grant Likelye169cfb2009-11-23 14:53:09 -070017#include <linux/of.h>
18#include <linux/of_fdt.h>
Marek Szyprowski3f0c8202014-02-28 14:42:48 +010019#include <linux/of_reserved_mem.h>
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +010020#include <linux/sizes.h>
Jeremy Kerr4ef7b372010-02-14 07:13:47 -070021#include <linux/string.h>
22#include <linux/errno.h>
Stephen Neuendorfferfe140422010-11-18 15:55:02 -080023#include <linux/slab.h>
Rob Herringe6a69282014-04-02 15:10:14 -050024#include <linux/libfdt.h>
Rob Herringb0a6fb32014-04-02 16:56:48 -050025#include <linux/debugfs.h>
Rob Herringfb11ffe2014-03-27 08:07:01 -050026#include <linux/serial_core.h>
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +010027#include <linux/sysfs.h>
Grant Likely51975db2010-02-01 21:34:14 -070028
Fabio Estevamc89810a2012-01-02 14:19:03 -020029#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
Jeremy Kerr4ef7b372010-02-14 07:13:47 -070030#include <asm/page.h>
31
Laura Abbott704033c2014-07-15 10:03:35 -070032/*
33 * of_fdt_limit_memory - limit the number of regions in the /memory node
34 * @limit: maximum entries
35 *
36 * Adjust the flattened device tree to have at most 'limit' number of
37 * memory entries in the /memory node. This function may be called
38 * any time after initial_boot_param is set.
39 */
40void of_fdt_limit_memory(int limit)
41{
42 int memory;
43 int len;
44 const void *val;
45 int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
46 int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
47 const uint32_t *addr_prop;
48 const uint32_t *size_prop;
49 int root_offset;
50 int cell_size;
51
52 root_offset = fdt_path_offset(initial_boot_params, "/");
53 if (root_offset < 0)
54 return;
55
56 addr_prop = fdt_getprop(initial_boot_params, root_offset,
57 "#address-cells", NULL);
58 if (addr_prop)
59 nr_address_cells = fdt32_to_cpu(*addr_prop);
60
61 size_prop = fdt_getprop(initial_boot_params, root_offset,
62 "#size-cells", NULL);
63 if (size_prop)
64 nr_size_cells = fdt32_to_cpu(*size_prop);
65
66 cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells);
67
68 memory = fdt_path_offset(initial_boot_params, "/memory");
69 if (memory > 0) {
70 val = fdt_getprop(initial_boot_params, memory, "reg", &len);
71 if (len > limit*cell_size) {
72 len = limit*cell_size;
73 pr_debug("Limiting number of entries to %d\n", limit);
74 fdt_setprop(initial_boot_params, memory, "reg", val,
75 len);
76 }
77 }
78}
79
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080080/**
81 * of_fdt_is_compatible - Return true if given node from the given blob has
82 * compat in its compatible list
83 * @blob: A device tree blob
84 * @node: node to test
85 * @compat: compatible string to compare with compatible list.
Grant Likelya4f740c2010-10-30 11:49:09 -040086 *
87 * On match, returns a non-zero value with smaller values returned for more
88 * specific compatible values.
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080089 */
Rob Herringc972de12014-04-01 22:48:01 -050090int of_fdt_is_compatible(const void *blob,
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080091 unsigned long node, const char *compat)
92{
93 const char *cp;
Rob Herring9d0c4df2014-04-01 23:49:03 -050094 int cplen;
95 unsigned long l, score = 0;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080096
Rob Herringe6a69282014-04-02 15:10:14 -050097 cp = fdt_getprop(blob, node, "compatible", &cplen);
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080098 if (cp == NULL)
99 return 0;
100 while (cplen > 0) {
Grant Likelya4f740c2010-10-30 11:49:09 -0400101 score++;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -0800102 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
Grant Likelya4f740c2010-10-30 11:49:09 -0400103 return score;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -0800104 l = strlen(cp) + 1;
105 cp += l;
106 cplen -= l;
107 }
108
109 return 0;
110}
111
Grant Likelya4f740c2010-10-30 11:49:09 -0400112/**
Kevin Cernekeecc783782015-04-09 13:05:15 -0700113 * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses
114 * @blob: A device tree blob
115 * @node: node to test
116 *
117 * Returns true if the node has a "big-endian" property, or if the kernel
118 * was compiled for BE *and* the node has a "native-endian" property.
119 * Returns false otherwise.
120 */
121bool of_fdt_is_big_endian(const void *blob, unsigned long node)
122{
123 if (fdt_getprop(blob, node, "big-endian", NULL))
124 return true;
125 if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
126 fdt_getprop(blob, node, "native-endian", NULL))
127 return true;
128 return false;
129}
130
131/**
Grant Likelya4f740c2010-10-30 11:49:09 -0400132 * of_fdt_match - Return true if node matches a list of compatible values
133 */
Rob Herringc972de12014-04-01 22:48:01 -0500134int of_fdt_match(const void *blob, unsigned long node,
Uwe Kleine-König7b482c82011-12-20 22:56:45 +0100135 const char *const *compat)
Grant Likelya4f740c2010-10-30 11:49:09 -0400136{
137 unsigned int tmp, score = 0;
138
139 if (!compat)
140 return 0;
141
142 while (*compat) {
143 tmp = of_fdt_is_compatible(blob, node, *compat);
144 if (tmp && (score == 0 || (tmp < score)))
145 score = tmp;
146 compat++;
147 }
148
149 return score;
150}
151
Grant Likely44856812013-08-29 13:30:35 +0100152static void *unflatten_dt_alloc(void **mem, unsigned long size,
Grant Likelybbd33932009-11-23 20:07:00 -0700153 unsigned long align)
154{
155 void *res;
156
Grant Likely44856812013-08-29 13:30:35 +0100157 *mem = PTR_ALIGN(*mem, align);
158 res = *mem;
Grant Likelybbd33932009-11-23 20:07:00 -0700159 *mem += size;
160
161 return res;
162}
163
164/**
165 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800166 * @blob: The parent device tree blob
Andres Salomona7006c92011-03-17 17:32:35 -0700167 * @mem: Memory chunk to use for allocating device nodes and properties
Masahiro Yamadace32f852015-04-13 10:30:20 +0900168 * @poffset: pointer to node in flat tree
Grant Likelybbd33932009-11-23 20:07:00 -0700169 * @dad: Parent struct device_node
Masahiro Yamadace32f852015-04-13 10:30:20 +0900170 * @nodepp: The device_node tree created by the call
Grant Likelybbd33932009-11-23 20:07:00 -0700171 * @fpsize: Size of the node path up at the current depth.
Masahiro Yamadace32f852015-04-13 10:30:20 +0900172 * @dryrun: If true, do not allocate device nodes but still calculate needed
173 * memory size
Grant Likelybbd33932009-11-23 20:07:00 -0700174 */
Geert Uytterhoeven3b1a2c92015-05-13 16:33:56 +0200175static void * unflatten_dt_node(const void *blob,
Grant Likely44856812013-08-29 13:30:35 +0100176 void *mem,
Rob Herringe6a69282014-04-02 15:10:14 -0500177 int *poffset,
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800178 struct device_node *dad,
Grant Likely5063e252014-10-03 16:28:27 +0100179 struct device_node **nodepp,
180 unsigned long fpsize,
181 bool dryrun)
Grant Likelybbd33932009-11-23 20:07:00 -0700182{
Rob Herringe6a69282014-04-02 15:10:14 -0500183 const __be32 *p;
Grant Likelybbd33932009-11-23 20:07:00 -0700184 struct device_node *np;
185 struct property *pp, **prev_pp = NULL;
Rob Herringe6a69282014-04-02 15:10:14 -0500186 const char *pathp;
Grant Likelybbd33932009-11-23 20:07:00 -0700187 unsigned int l, allocl;
Saurabh Sengar0b13ea82015-10-27 09:12:01 +0530188 static int depth;
Rob Herringe6a69282014-04-02 15:10:14 -0500189 int old_depth;
190 int offset;
Grant Likelybbd33932009-11-23 20:07:00 -0700191 int has_name = 0;
192 int new_format = 0;
193
Rob Herringe6a69282014-04-02 15:10:14 -0500194 pathp = fdt_get_name(blob, *poffset, &l);
195 if (!pathp)
Grant Likelybbd33932009-11-23 20:07:00 -0700196 return mem;
Rob Herringe6a69282014-04-02 15:10:14 -0500197
Ricky Liang05f46472015-04-14 12:36:05 +0800198 allocl = ++l;
Grant Likelybbd33932009-11-23 20:07:00 -0700199
200 /* version 0x10 has a more compact unit name here instead of the full
201 * path. we accumulate the full path size using "fpsize", we'll rebuild
202 * it later. We detect this because the first character of the name is
203 * not '/'.
204 */
205 if ((*pathp) != '/') {
206 new_format = 1;
207 if (fpsize == 0) {
208 /* root node: special case. fpsize accounts for path
209 * plus terminating zero. root node only has '/', so
210 * fpsize should be 2, but we want to avoid the first
211 * level nodes to have two '/' so we use fpsize 1 here
212 */
213 fpsize = 1;
214 allocl = 2;
Catalin Marinas0fca5de2012-11-16 15:14:38 +0000215 l = 1;
Rob Herringe6a69282014-04-02 15:10:14 -0500216 pathp = "";
Grant Likelybbd33932009-11-23 20:07:00 -0700217 } else {
218 /* account for '/' and path size minus terminal 0
219 * already in 'l'
220 */
221 fpsize += l;
222 allocl = fpsize;
223 }
224 }
225
226 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
227 __alignof__(struct device_node));
Grant Likely5063e252014-10-03 16:28:27 +0100228 if (!dryrun) {
Grant Likelyc22618a2012-11-14 22:37:12 +0000229 char *fn;
Pantelis Antoniou0829f6d2013-12-13 20:08:59 +0200230 of_node_init(np);
Grant Likelyc22618a2012-11-14 22:37:12 +0000231 np->full_name = fn = ((char *)np) + sizeof(*np);
Grant Likelybbd33932009-11-23 20:07:00 -0700232 if (new_format) {
Grant Likelybbd33932009-11-23 20:07:00 -0700233 /* rebuild full path for new format */
234 if (dad && dad->parent) {
235 strcpy(fn, dad->full_name);
236#ifdef DEBUG
237 if ((strlen(fn) + l + 1) != allocl) {
238 pr_debug("%s: p: %d, l: %d, a: %d\n",
239 pathp, (int)strlen(fn),
240 l, allocl);
241 }
242#endif
243 fn += strlen(fn);
244 }
245 *(fn++) = '/';
Grant Likelyc22618a2012-11-14 22:37:12 +0000246 }
247 memcpy(fn, pathp, l);
248
Grant Likelybbd33932009-11-23 20:07:00 -0700249 prev_pp = &np->properties;
Grant Likelybbd33932009-11-23 20:07:00 -0700250 if (dad != NULL) {
251 np->parent = dad;
Grant Likely70161ff2014-11-28 16:03:33 +0000252 np->sibling = dad->child;
253 dad->child = np;
Grant Likelybbd33932009-11-23 20:07:00 -0700254 }
Grant Likelybbd33932009-11-23 20:07:00 -0700255 }
Andres Salomona7006c92011-03-17 17:32:35 -0700256 /* process properties */
Rob Herringe6a69282014-04-02 15:10:14 -0500257 for (offset = fdt_first_property_offset(blob, *poffset);
258 (offset >= 0);
259 (offset = fdt_next_property_offset(blob, offset))) {
260 const char *pname;
261 u32 sz;
Grant Likelybbd33932009-11-23 20:07:00 -0700262
Rob Herringe6a69282014-04-02 15:10:14 -0500263 if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) {
264 offset = -FDT_ERR_INTERNAL;
Grant Likelybbd33932009-11-23 20:07:00 -0700265 break;
Rob Herringe6a69282014-04-02 15:10:14 -0500266 }
Grant Likelybbd33932009-11-23 20:07:00 -0700267
Grant Likelybbd33932009-11-23 20:07:00 -0700268 if (pname == NULL) {
269 pr_info("Can't find property name in list !\n");
270 break;
271 }
272 if (strcmp(pname, "name") == 0)
273 has_name = 1;
Grant Likelybbd33932009-11-23 20:07:00 -0700274 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
275 __alignof__(struct property));
Grant Likely5063e252014-10-03 16:28:27 +0100276 if (!dryrun) {
David Gibson04b954a2010-02-01 21:34:15 -0700277 /* We accept flattened tree phandles either in
278 * ePAPR-style "phandle" properties, or the
279 * legacy "linux,phandle" properties. If both
280 * appear and have different values, things
281 * will get weird. Don't do that. */
282 if ((strcmp(pname, "phandle") == 0) ||
283 (strcmp(pname, "linux,phandle") == 0)) {
Grant Likely6016a362010-01-28 14:06:53 -0700284 if (np->phandle == 0)
Rob Herringe6a69282014-04-02 15:10:14 -0500285 np->phandle = be32_to_cpup(p);
Grant Likelybbd33932009-11-23 20:07:00 -0700286 }
David Gibson04b954a2010-02-01 21:34:15 -0700287 /* And we process the "ibm,phandle" property
288 * used in pSeries dynamic device tree
289 * stuff */
Grant Likelybbd33932009-11-23 20:07:00 -0700290 if (strcmp(pname, "ibm,phandle") == 0)
Rob Herringe6a69282014-04-02 15:10:14 -0500291 np->phandle = be32_to_cpup(p);
292 pp->name = (char *)pname;
Grant Likelybbd33932009-11-23 20:07:00 -0700293 pp->length = sz;
Rob Herringe6a69282014-04-02 15:10:14 -0500294 pp->value = (__be32 *)p;
Grant Likelybbd33932009-11-23 20:07:00 -0700295 *prev_pp = pp;
296 prev_pp = &pp->next;
297 }
Grant Likelybbd33932009-11-23 20:07:00 -0700298 }
299 /* with version 0x10 we may not have the name property, recreate
300 * it here from the unit name if absent
301 */
302 if (!has_name) {
Rob Herringe6a69282014-04-02 15:10:14 -0500303 const char *p1 = pathp, *ps = pathp, *pa = NULL;
Grant Likelybbd33932009-11-23 20:07:00 -0700304 int sz;
305
306 while (*p1) {
307 if ((*p1) == '@')
308 pa = p1;
309 if ((*p1) == '/')
310 ps = p1 + 1;
311 p1++;
312 }
313 if (pa < ps)
314 pa = p1;
315 sz = (pa - ps) + 1;
316 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
317 __alignof__(struct property));
Grant Likely5063e252014-10-03 16:28:27 +0100318 if (!dryrun) {
Grant Likelybbd33932009-11-23 20:07:00 -0700319 pp->name = "name";
320 pp->length = sz;
321 pp->value = pp + 1;
322 *prev_pp = pp;
323 prev_pp = &pp->next;
324 memcpy(pp->value, ps, sz - 1);
325 ((char *)pp->value)[sz - 1] = 0;
326 pr_debug("fixed up name for %s -> %s\n", pathp,
327 (char *)pp->value);
328 }
329 }
Grant Likely5063e252014-10-03 16:28:27 +0100330 if (!dryrun) {
Grant Likelybbd33932009-11-23 20:07:00 -0700331 *prev_pp = NULL;
332 np->name = of_get_property(np, "name", NULL);
333 np->type = of_get_property(np, "device_type", NULL);
334
335 if (!np->name)
336 np->name = "<NULL>";
337 if (!np->type)
338 np->type = "<NULL>";
339 }
Rob Herringe6a69282014-04-02 15:10:14 -0500340
341 old_depth = depth;
342 *poffset = fdt_next_node(blob, *poffset, &depth);
343 if (depth < 0)
344 depth = 0;
345 while (*poffset > 0 && depth > old_depth)
Grant Likely5063e252014-10-03 16:28:27 +0100346 mem = unflatten_dt_node(blob, mem, poffset, np, NULL,
347 fpsize, dryrun);
Rob Herringe6a69282014-04-02 15:10:14 -0500348
349 if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND)
350 pr_err("unflatten: error %d processing FDT\n", *poffset);
351
Grant Likely70161ff2014-11-28 16:03:33 +0000352 /*
353 * Reverse the child list. Some drivers assumes node order matches .dts
354 * node order
355 */
356 if (!dryrun && np->child) {
357 struct device_node *child = np->child;
358 np->child = NULL;
359 while (child) {
360 struct device_node *next = child->sibling;
361 child->sibling = np->child;
362 np->child = child;
363 child = next;
364 }
365 }
366
Grant Likely5063e252014-10-03 16:28:27 +0100367 if (nodepp)
368 *nodepp = np;
Grant Likelybbd33932009-11-23 20:07:00 -0700369
370 return mem;
371}
Grant Likely41f88002009-11-23 20:07:01 -0700372
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800373/**
374 * __unflatten_device_tree - create tree of device_nodes from flat blob
375 *
376 * unflattens a device-tree, creating the
377 * tree of struct device_node. It also fills the "name" and "type"
378 * pointers of the nodes so the normal device-tree walking functions
379 * can be used.
380 * @blob: The blob to expand
381 * @mynodes: The device_node tree created by the call
382 * @dt_alloc: An allocator that provides a virtual address to memory
383 * for the resulting tree
384 */
Geert Uytterhoeven3b1a2c92015-05-13 16:33:56 +0200385static void __unflatten_device_tree(const void *blob,
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800386 struct device_node **mynodes,
387 void * (*dt_alloc)(u64 size, u64 align))
388{
Grant Likely44856812013-08-29 13:30:35 +0100389 unsigned long size;
Rob Herringe6a69282014-04-02 15:10:14 -0500390 int start;
391 void *mem;
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800392
393 pr_debug(" -> unflatten_device_tree()\n");
394
395 if (!blob) {
396 pr_debug("No device tree pointer\n");
397 return;
398 }
399
400 pr_debug("Unflattening device tree:\n");
Rob Herringc972de12014-04-01 22:48:01 -0500401 pr_debug("magic: %08x\n", fdt_magic(blob));
402 pr_debug("size: %08x\n", fdt_totalsize(blob));
403 pr_debug("version: %08x\n", fdt_version(blob));
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800404
Rob Herringc972de12014-04-01 22:48:01 -0500405 if (fdt_check_header(blob)) {
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800406 pr_err("Invalid device tree blob header\n");
407 return;
408 }
409
410 /* First pass, scan for size */
Rob Herringe6a69282014-04-02 15:10:14 -0500411 start = 0;
Grant Likely5063e252014-10-03 16:28:27 +0100412 size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true);
Grant Likely44856812013-08-29 13:30:35 +0100413 size = ALIGN(size, 4);
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800414
415 pr_debug(" size is %lx, allocating...\n", size);
416
417 /* Allocate memory for the expanded device tree */
Grant Likely44856812013-08-29 13:30:35 +0100418 mem = dt_alloc(size + 4, __alignof__(struct device_node));
419 memset(mem, 0, size);
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800420
Grant Likely44856812013-08-29 13:30:35 +0100421 *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
Wladislav Wiebe9e401272013-08-12 13:06:53 +0200422
Grant Likely44856812013-08-29 13:30:35 +0100423 pr_debug(" unflattening %p...\n", mem);
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800424
425 /* Second pass, do actual unflattening */
Rob Herringe6a69282014-04-02 15:10:14 -0500426 start = 0;
Grant Likely5063e252014-10-03 16:28:27 +0100427 unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false);
Grant Likely44856812013-08-29 13:30:35 +0100428 if (be32_to_cpup(mem + size) != 0xdeadbeef)
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800429 pr_warning("End of tree marker overwritten: %08x\n",
Grant Likely44856812013-08-29 13:30:35 +0100430 be32_to_cpup(mem + size));
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800431
432 pr_debug(" <- unflatten_device_tree()\n");
433}
434
435static void *kernel_tree_alloc(u64 size, u64 align)
436{
437 return kzalloc(size, GFP_KERNEL);
438}
439
Guenter Roeckf8062382015-12-05 16:13:53 -0800440static DEFINE_MUTEX(of_fdt_unflatten_mutex);
441
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800442/**
443 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
444 *
445 * unflattens the device-tree passed by the firmware, creating the
446 * tree of struct device_node. It also fills the "name" and "type"
447 * pointers of the nodes so the normal device-tree walking functions
448 * can be used.
449 */
Geert Uytterhoeven3b1a2c92015-05-13 16:33:56 +0200450void of_fdt_unflatten_tree(const unsigned long *blob,
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800451 struct device_node **mynodes)
452{
Guenter Roeckf8062382015-12-05 16:13:53 -0800453 mutex_lock(&of_fdt_unflatten_mutex);
Rob Herringc972de12014-04-01 22:48:01 -0500454 __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);
Guenter Roeckf8062382015-12-05 16:13:53 -0800455 mutex_unlock(&of_fdt_unflatten_mutex);
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800456}
457EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
458
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800459/* Everything below here references initial_boot_params directly. */
460int __initdata dt_root_addr_cells;
461int __initdata dt_root_size_cells;
462
Rob Herring1daa0c42014-03-31 15:25:04 -0500463void *initial_boot_params;
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800464
465#ifdef CONFIG_OF_EARLY_FLATTREE
466
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +0100467static u32 of_fdt_crc32;
468
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800469/**
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100470 * res_mem_reserve_reg() - reserve all memory described in 'reg' property
471 */
472static int __init __reserved_mem_reserve_reg(unsigned long node,
473 const char *uname)
474{
475 int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
476 phys_addr_t base, size;
Rob Herring9d0c4df2014-04-01 23:49:03 -0500477 int len;
478 const __be32 *prop;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100479 int nomap, first = 1;
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100480
481 prop = of_get_flat_dt_prop(node, "reg", &len);
482 if (!prop)
483 return -ENOENT;
484
485 if (len && len % t_len != 0) {
486 pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
487 uname);
488 return -EINVAL;
489 }
490
491 nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
492
493 while (len >= t_len) {
494 base = dt_mem_next_cell(dt_root_addr_cells, &prop);
495 size = dt_mem_next_cell(dt_root_size_cells, &prop);
496
Al Cooperb5f2a8c2014-08-06 16:30:04 -0400497 if (size &&
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100498 early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
499 pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
500 uname, &base, (unsigned long)size / SZ_1M);
501 else
502 pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
503 uname, &base, (unsigned long)size / SZ_1M);
504
505 len -= t_len;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100506 if (first) {
507 fdt_reserved_mem_save_node(node, uname, base, size);
508 first = 0;
509 }
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100510 }
511 return 0;
512}
513
514/**
515 * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
516 * in /reserved-memory matches the values supported by the current implementation,
517 * also check if ranges property has been provided
518 */
Xiubo Li5b624112014-04-08 13:48:07 +0800519static int __init __reserved_mem_check_root(unsigned long node)
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100520{
Rob Herring9d0c4df2014-04-01 23:49:03 -0500521 const __be32 *prop;
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100522
523 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
524 if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
525 return -EINVAL;
526
527 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
528 if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
529 return -EINVAL;
530
531 prop = of_get_flat_dt_prop(node, "ranges", NULL);
532 if (!prop)
533 return -EINVAL;
534 return 0;
535}
536
537/**
538 * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
539 */
540static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
541 int depth, void *data)
542{
543 static int found;
544 const char *status;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100545 int err;
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100546
547 if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
548 if (__reserved_mem_check_root(node) != 0) {
549 pr_err("Reserved memory: unsupported node format, ignoring\n");
550 /* break scan */
551 return 1;
552 }
553 found = 1;
554 /* scan next node */
555 return 0;
556 } else if (!found) {
557 /* scan next node */
558 return 0;
559 } else if (found && depth < 2) {
560 /* scanning of /reserved-memory has been finished */
561 return 1;
562 }
563
564 status = of_get_flat_dt_prop(node, "status", NULL);
565 if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
566 return 0;
567
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100568 err = __reserved_mem_reserve_reg(node, uname);
569 if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
570 fdt_reserved_mem_save_node(node, uname, 0, 0);
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100571
572 /* scan next node */
573 return 0;
574}
575
576/**
577 * early_init_fdt_scan_reserved_mem() - create reserved memory regions
578 *
579 * This function grabs memory from early allocator for device exclusive use
580 * defined in device tree structures. It should be called by arch specific code
581 * once the early allocator (i.e. memblock) has been fully activated.
582 */
583void __init early_init_fdt_scan_reserved_mem(void)
584{
Rob Herringd1552ce2014-04-01 22:46:48 -0500585 int n;
586 u64 base, size;
587
Josh Cartwright2040b522014-03-13 16:36:36 -0500588 if (!initial_boot_params)
589 return;
590
Rob Herringd1552ce2014-04-01 22:46:48 -0500591 /* Process header /memreserve/ fields */
592 for (n = 0; ; n++) {
593 fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
594 if (!size)
595 break;
596 early_init_dt_reserve_memory_arch(base, size, 0);
597 }
598
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100599 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100600 fdt_init_reserved_mem();
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +0100601}
602
603/**
Ard Biesheuvel24bbd922015-06-01 13:40:31 +0200604 * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob
605 */
606void __init early_init_fdt_reserve_self(void)
607{
608 if (!initial_boot_params)
609 return;
610
611 /* Reserve the dtb region */
612 early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
613 fdt_totalsize(initial_boot_params),
614 0);
615}
616
617/**
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800618 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
619 * @it: callback function
620 * @data: context data pointer
621 *
622 * This function is used to scan the flattened device-tree, it is
623 * used to extract the memory information at boot before we can
624 * unflatten the tree
625 */
626int __init of_scan_flat_dt(int (*it)(unsigned long node,
627 const char *uname, int depth,
628 void *data),
629 void *data)
630{
Rob Herringe6a69282014-04-02 15:10:14 -0500631 const void *blob = initial_boot_params;
632 const char *pathp;
633 int offset, rc = 0, depth = -1;
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800634
Rob Herringe6a69282014-04-02 15:10:14 -0500635 for (offset = fdt_next_node(blob, -1, &depth);
636 offset >= 0 && depth >= 0 && !rc;
637 offset = fdt_next_node(blob, offset, &depth)) {
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800638
Rob Herringe6a69282014-04-02 15:10:14 -0500639 pathp = fdt_get_name(blob, offset, NULL);
Andy Shevchenko375da3a2012-12-17 16:01:28 -0800640 if (*pathp == '/')
641 pathp = kbasename(pathp);
Rob Herringe6a69282014-04-02 15:10:14 -0500642 rc = it(offset, pathp, depth, data);
643 }
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800644 return rc;
645}
646
647/**
648 * of_get_flat_dt_root - find the root node in the flat blob
649 */
650unsigned long __init of_get_flat_dt_root(void)
651{
Rob Herringe6a69282014-04-02 15:10:14 -0500652 return 0;
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800653}
654
655/**
Rob Herringc0556d32014-04-22 12:55:10 -0500656 * of_get_flat_dt_size - Return the total size of the FDT
657 */
658int __init of_get_flat_dt_size(void)
659{
660 return fdt_totalsize(initial_boot_params);
661}
662
663/**
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800664 * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
665 *
666 * This function can be used within scan_flattened_dt callback to get
667 * access to properties
668 */
Rob Herring9d0c4df2014-04-01 23:49:03 -0500669const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
670 int *size)
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800671{
Rob Herringe6a69282014-04-02 15:10:14 -0500672 return fdt_getprop(initial_boot_params, node, name, size);
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800673}
674
675/**
676 * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
677 * @node: node to test
678 * @compat: compatible string to compare with compatible list.
679 */
680int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
681{
682 return of_fdt_is_compatible(initial_boot_params, node, compat);
683}
684
Grant Likelya4f740c2010-10-30 11:49:09 -0400685/**
686 * of_flat_dt_match - Return true if node matches a list of compatible values
687 */
Uwe Kleine-König7b482c82011-12-20 22:56:45 +0100688int __init of_flat_dt_match(unsigned long node, const char *const *compat)
Grant Likelya4f740c2010-10-30 11:49:09 -0400689{
690 return of_fdt_match(initial_boot_params, node, compat);
691}
692
Marek Szyprowski57d74bc2013-08-26 14:41:56 +0200693struct fdt_scan_status {
694 const char *name;
695 int namelen;
696 int depth;
697 int found;
698 int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
699 void *data;
700};
701
Rob Herring6a903a22013-08-27 21:41:56 -0500702const char * __init of_flat_dt_get_machine_name(void)
703{
704 const char *name;
705 unsigned long dt_root = of_get_flat_dt_root();
706
707 name = of_get_flat_dt_prop(dt_root, "model", NULL);
708 if (!name)
709 name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
710 return name;
711}
712
713/**
714 * of_flat_dt_match_machine - Iterate match tables to find matching machine.
715 *
716 * @default_match: A machine specific ptr to return in case of no match.
717 * @get_next_compat: callback function to return next compatible match table.
718 *
719 * Iterate through machine match tables to find the best match for the machine
720 * compatible string in the FDT.
721 */
722const void * __init of_flat_dt_match_machine(const void *default_match,
723 const void * (*get_next_compat)(const char * const**))
724{
725 const void *data = NULL;
726 const void *best_data = default_match;
727 const char *const *compat;
728 unsigned long dt_root;
729 unsigned int best_score = ~1, score = 0;
730
731 dt_root = of_get_flat_dt_root();
732 while ((data = get_next_compat(&compat))) {
733 score = of_flat_dt_match(dt_root, compat);
734 if (score > 0 && score < best_score) {
735 best_data = data;
736 best_score = score;
737 }
738 }
739 if (!best_data) {
740 const char *prop;
Rob Herring9d0c4df2014-04-01 23:49:03 -0500741 int size;
Rob Herring6a903a22013-08-27 21:41:56 -0500742
743 pr_err("\n unrecognized device tree list:\n[ ");
744
745 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
746 if (prop) {
747 while (size > 0) {
748 printk("'%s' ", prop);
749 size -= strlen(prop) + 1;
750 prop += strlen(prop) + 1;
751 }
752 }
753 printk("]\n\n");
754 return NULL;
755 }
756
757 pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
758
759 return best_data;
760}
761
Grant Likelyf7b3a832009-11-24 03:26:58 -0700762#ifdef CONFIG_BLK_DEV_INITRD
Ard Biesheuvel369bc9a2016-02-16 13:52:33 +0100763#ifndef __early_init_dt_declare_initrd
764static void __early_init_dt_declare_initrd(unsigned long start,
765 unsigned long end)
766{
767 initrd_start = (unsigned long)__va(start);
768 initrd_end = (unsigned long)__va(end);
769 initrd_below_start_ok = 1;
770}
771#endif
772
Grant Likelyf7b3a832009-11-24 03:26:58 -0700773/**
774 * early_init_dt_check_for_initrd - Decode initrd location from flat tree
775 * @node: reference to node containing initrd location ('chosen')
776 */
Rob Herring29eb45a2013-08-30 17:06:53 -0500777static void __init early_init_dt_check_for_initrd(unsigned long node)
Grant Likelyf7b3a832009-11-24 03:26:58 -0700778{
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400779 u64 start, end;
Rob Herring9d0c4df2014-04-01 23:49:03 -0500780 int len;
781 const __be32 *prop;
Grant Likelyf7b3a832009-11-24 03:26:58 -0700782
783 pr_debug("Looking for initrd properties... ");
784
785 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700786 if (!prop)
787 return;
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400788 start = of_read_number(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700789
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700790 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
791 if (!prop)
792 return;
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400793 end = of_read_number(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700794
Ard Biesheuvel369bc9a2016-02-16 13:52:33 +0100795 __early_init_dt_declare_initrd(start, end);
Rob Herring29eb45a2013-08-30 17:06:53 -0500796
Santosh Shilimkar374d5c92013-07-01 14:20:35 -0400797 pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
798 (unsigned long long)start, (unsigned long long)end);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700799}
800#else
Rob Herring29eb45a2013-08-30 17:06:53 -0500801static inline void early_init_dt_check_for_initrd(unsigned long node)
Grant Likelyf7b3a832009-11-24 03:26:58 -0700802{
803}
804#endif /* CONFIG_BLK_DEV_INITRD */
805
Rob Herringfb11ffe2014-03-27 08:07:01 -0500806#ifdef CONFIG_SERIAL_EARLYCON
Rob Herringfb11ffe2014-03-27 08:07:01 -0500807
Lad, Prabhakar523bf172015-02-04 12:04:06 +0000808static int __init early_init_dt_scan_chosen_serial(void)
Rob Herringfb11ffe2014-03-27 08:07:01 -0500809{
810 int offset;
Peter Hurley4d118c92016-01-16 15:23:42 -0800811 const char *p, *q, *options = NULL;
Rob Herringfb11ffe2014-03-27 08:07:01 -0500812 int l;
Peter Hurley2eaa7902016-01-16 15:23:39 -0800813 const struct earlycon_id *match;
Rob Herringfb11ffe2014-03-27 08:07:01 -0500814 const void *fdt = initial_boot_params;
815
816 offset = fdt_path_offset(fdt, "/chosen");
817 if (offset < 0)
818 offset = fdt_path_offset(fdt, "/chosen@0");
819 if (offset < 0)
820 return -ENOENT;
821
822 p = fdt_getprop(fdt, offset, "stdout-path", &l);
823 if (!p)
824 p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);
825 if (!p || !l)
826 return -ENOENT;
827
Peter Hurley4d118c92016-01-16 15:23:42 -0800828 q = strchrnul(p, ':');
829 if (*q != '\0')
830 options = q + 1;
Peter Hurley0fcc2862016-01-16 15:23:48 -0800831 l = q - p;
Stefan Agner6296ad92015-10-10 01:29:30 -0700832
Rob Herringfb11ffe2014-03-27 08:07:01 -0500833 /* Get the node specified by stdout-path */
Peter Hurley0fcc2862016-01-16 15:23:48 -0800834 offset = fdt_path_offset_namelen(fdt, p, l);
835 if (offset < 0) {
836 pr_warn("earlycon: stdout-path %.*s not found\n", l, p);
837 return 0;
838 }
Rob Herringfb11ffe2014-03-27 08:07:01 -0500839
Peter Hurley2eaa7902016-01-16 15:23:39 -0800840 for (match = __earlycon_table; match < __earlycon_table_end; match++) {
Peter Hurley2eaa7902016-01-16 15:23:39 -0800841 if (!match->compatible[0])
Rob Herringfb11ffe2014-03-27 08:07:01 -0500842 continue;
Peter Hurley2eaa7902016-01-16 15:23:39 -0800843
844 if (fdt_node_check_compatible(fdt, offset, match->compatible))
845 continue;
Rob Herringfb11ffe2014-03-27 08:07:01 -0500846
Peter Hurleyc90fe9c2016-01-16 15:23:44 -0800847 of_setup_earlycon(match, offset, options);
Rob Herringfb11ffe2014-03-27 08:07:01 -0500848 return 0;
849 }
850 return -ENODEV;
851}
852
853static int __init setup_of_earlycon(char *buf)
854{
855 if (buf)
856 return 0;
857
858 return early_init_dt_scan_chosen_serial();
859}
860early_param("earlycon", setup_of_earlycon);
861#endif
862
Grant Likely41f88002009-11-23 20:07:01 -0700863/**
Grant Likelyf00abd92009-11-24 03:27:10 -0700864 * early_init_dt_scan_root - fetch the top level address and size cells
865 */
866int __init early_init_dt_scan_root(unsigned long node, const char *uname,
867 int depth, void *data)
868{
Rob Herring9d0c4df2014-04-01 23:49:03 -0500869 const __be32 *prop;
Grant Likelyf00abd92009-11-24 03:27:10 -0700870
871 if (depth != 0)
872 return 0;
873
Jeremy Kerr33714882010-01-30 01:45:26 -0700874 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
875 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
876
Grant Likelyf00abd92009-11-24 03:27:10 -0700877 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -0700878 if (prop)
879 dt_root_size_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -0700880 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
881
882 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -0700883 if (prop)
884 dt_root_addr_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -0700885 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
886
887 /* break now */
888 return 1;
889}
890
Rob Herring9d0c4df2014-04-01 23:49:03 -0500891u64 __init dt_mem_next_cell(int s, const __be32 **cellp)
Grant Likely83f7a062009-11-24 03:37:56 -0700892{
Rob Herring9d0c4df2014-04-01 23:49:03 -0500893 const __be32 *p = *cellp;
Grant Likely83f7a062009-11-24 03:37:56 -0700894
895 *cellp = p + s;
896 return of_read_number(p, s);
897}
898
Grant Likely51975db2010-02-01 21:34:14 -0700899/**
900 * early_init_dt_scan_memory - Look for an parse memory nodes
901 */
902int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
903 int depth, void *data)
904{
Rob Herring9d0c4df2014-04-01 23:49:03 -0500905 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
906 const __be32 *reg, *endp;
907 int l;
Grant Likely51975db2010-02-01 21:34:14 -0700908
909 /* We are scanning "memory" nodes only */
910 if (type == NULL) {
911 /*
912 * The longtrail doesn't have a device_type on the
913 * /memory node, so look for the node called /memory@0.
914 */
Leif Lindholmb44aa252014-04-17 18:42:01 +0100915 if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0)
Grant Likely51975db2010-02-01 21:34:14 -0700916 return 0;
917 } else if (strcmp(type, "memory") != 0)
918 return 0;
919
920 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
921 if (reg == NULL)
922 reg = of_get_flat_dt_prop(node, "reg", &l);
923 if (reg == NULL)
924 return 0;
925
926 endp = reg + (l / sizeof(__be32));
927
Florian Fainellic954b362015-04-12 13:16:26 -0700928 pr_debug("memory scan node %s, reg size %d,\n", uname, l);
Grant Likely51975db2010-02-01 21:34:14 -0700929
930 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
931 u64 base, size;
932
933 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
934 size = dt_mem_next_cell(dt_root_size_cells, &reg);
935
936 if (size == 0)
937 continue;
938 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
939 (unsigned long long)size);
940
941 early_init_dt_add_memory_arch(base, size);
942 }
943
944 return 0;
945}
946
Grant Likely86e03222009-12-10 23:42:21 -0700947int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
948 int depth, void *data)
949{
Rob Herring9d0c4df2014-04-01 23:49:03 -0500950 int l;
951 const char *p;
Grant Likely86e03222009-12-10 23:42:21 -0700952
953 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
954
Grant Likely85f60ae2011-04-29 00:18:16 -0600955 if (depth != 1 || !data ||
Grant Likely86e03222009-12-10 23:42:21 -0700956 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
957 return 0;
958
959 early_init_dt_check_for_initrd(node);
960
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300961 /* Retrieve command line */
Grant Likely86e03222009-12-10 23:42:21 -0700962 p = of_get_flat_dt_prop(node, "bootargs", &l);
963 if (p != NULL && l > 0)
Grant Likely85f60ae2011-04-29 00:18:16 -0600964 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
Grant Likely86e03222009-12-10 23:42:21 -0700965
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +0000966 /*
967 * CONFIG_CMDLINE is meant to be a default in case nothing else
968 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
969 * is set in which case we override whatever was found earlier.
970 */
Grant Likely86e03222009-12-10 23:42:21 -0700971#ifdef CONFIG_CMDLINE
972#ifndef CONFIG_CMDLINE_FORCE
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +0000973 if (!((char *)data)[0])
Grant Likely86e03222009-12-10 23:42:21 -0700974#endif
Grant Likely85f60ae2011-04-29 00:18:16 -0600975 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
Grant Likely86e03222009-12-10 23:42:21 -0700976#endif /* CONFIG_CMDLINE */
977
Grant Likely85f60ae2011-04-29 00:18:16 -0600978 pr_debug("Command line is: %s\n", (char*)data);
Grant Likely86e03222009-12-10 23:42:21 -0700979
980 /* break now */
981 return 1;
982}
983
Grant Likelya1727da2013-08-28 21:18:32 +0100984#ifdef CONFIG_HAVE_MEMBLOCK
Ard Biesheuvel270522a2016-02-16 13:52:32 +0100985#ifndef MIN_MEMBLOCK_ADDR
986#define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET)
987#endif
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +0100988#ifndef MAX_MEMBLOCK_ADDR
989#define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0)
990#endif
Laura Abbott3069f0c2014-07-07 17:45:43 -0700991
Rob Herring068f6312013-09-24 22:20:01 -0500992void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
993{
Ard Biesheuvel270522a2016-02-16 13:52:32 +0100994 const u64 phys_offset = MIN_MEMBLOCK_ADDR;
Geert Uytterhoeven8f73d4b2014-08-20 17:10:31 +0200995
996 if (!PAGE_ALIGNED(base)) {
Ard Biesheuvel8cccffc2014-10-29 17:09:32 +0100997 if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
998 pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
999 base, base + size);
1000 return;
1001 }
Geert Uytterhoeven8f73d4b2014-08-20 17:10:31 +02001002 size -= PAGE_SIZE - (base & ~PAGE_MASK);
1003 base = PAGE_ALIGN(base);
1004 }
Rob Herring068f6312013-09-24 22:20:01 -05001005 size &= PAGE_MASK;
Laura Abbotta67a6ed2014-06-19 20:13:38 -07001006
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +01001007 if (base > MAX_MEMBLOCK_ADDR) {
Laura Abbott3069f0c2014-07-07 17:45:43 -07001008 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
1009 base, base + size);
1010 return;
1011 }
Laura Abbotta67a6ed2014-06-19 20:13:38 -07001012
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +01001013 if (base + size - 1 > MAX_MEMBLOCK_ADDR) {
Srinivas Kandagatla9aacd602014-09-23 10:59:09 +01001014 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
Ard Biesheuvel8eafeb42015-08-18 10:34:41 +01001015 ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size);
1016 size = MAX_MEMBLOCK_ADDR - base + 1;
Laura Abbotta67a6ed2014-06-19 20:13:38 -07001017 }
1018
Rob Herring068f6312013-09-24 22:20:01 -05001019 if (base + size < phys_offset) {
1020 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
1021 base, base + size);
1022 return;
1023 }
1024 if (base < phys_offset) {
1025 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
1026 base, phys_offset);
1027 size -= phys_offset - base;
1028 base = phys_offset;
1029 }
1030 memblock_add(base, size);
1031}
1032
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001033int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
1034 phys_addr_t size, bool nomap)
1035{
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001036 if (nomap)
1037 return memblock_remove(base, size);
1038 return memblock_reserve(base, size);
1039}
1040
Grant Likelya1727da2013-08-28 21:18:32 +01001041/*
1042 * called from unflatten_device_tree() to bootstrap devicetree itself
1043 * Architectures can override this definition if memblock isn't used
1044 */
1045void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
1046{
1047 return __va(memblock_alloc(size, align));
1048}
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001049#else
Rob Herringaefc7ec2015-06-18 20:35:46 -05001050void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
1051{
1052 WARN_ON(1);
1053}
1054
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001055int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
1056 phys_addr_t size, bool nomap)
1057{
Dmitry V. Krivenok78bb2ab2015-11-30 23:45:48 +03001058 pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n",
Rob Herring1d1a6612014-04-22 12:50:24 -05001059 &base, &size, nomap ? " (nomap)" : "");
Marek Szyprowskie8d9d1f2014-02-28 14:42:47 +01001060 return -ENOSYS;
1061}
Rob Herringaefc7ec2015-06-18 20:35:46 -05001062
1063void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
1064{
1065 WARN_ON(1);
1066 return NULL;
1067}
Grant Likelya1727da2013-08-28 21:18:32 +01001068#endif
1069
Laura Abbott4972a742014-07-15 10:03:34 -07001070bool __init early_init_dt_verify(void *params)
Rob Herring0288ffcb2013-08-26 09:47:40 -05001071{
1072 if (!params)
1073 return false;
1074
Bjorn Helgaas50ba08f2014-10-29 12:15:00 -06001075 /* check device tree validity */
1076 if (fdt_check_header(params))
1077 return false;
1078
Rob Herring0288ffcb2013-08-26 09:47:40 -05001079 /* Setup flat device-tree pointer */
1080 initial_boot_params = params;
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001081 of_fdt_crc32 = crc32_be(~0, initial_boot_params,
1082 fdt_totalsize(initial_boot_params));
Laura Abbott4972a742014-07-15 10:03:34 -07001083 return true;
1084}
1085
1086
1087void __init early_init_dt_scan_nodes(void)
1088{
Rob Herring0288ffcb2013-08-26 09:47:40 -05001089 /* Retrieve various information from the /chosen node */
1090 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
1091
1092 /* Initialize {size,address}-cells info */
1093 of_scan_flat_dt(early_init_dt_scan_root, NULL);
1094
1095 /* Setup memory, calling early_init_dt_add_memory_arch */
1096 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
Laura Abbott4972a742014-07-15 10:03:34 -07001097}
Rob Herring0288ffcb2013-08-26 09:47:40 -05001098
Laura Abbott4972a742014-07-15 10:03:34 -07001099bool __init early_init_dt_scan(void *params)
1100{
1101 bool status;
1102
1103 status = early_init_dt_verify(params);
1104 if (!status)
1105 return false;
1106
1107 early_init_dt_scan_nodes();
Rob Herring0288ffcb2013-08-26 09:47:40 -05001108 return true;
1109}
1110
Grant Likelyf00abd92009-11-24 03:27:10 -07001111/**
Grant Likely41f88002009-11-23 20:07:01 -07001112 * unflatten_device_tree - create tree of device_nodes from flat blob
1113 *
1114 * unflattens the device-tree passed by the firmware, creating the
1115 * tree of struct device_node. It also fills the "name" and "type"
1116 * pointers of the nodes so the normal device-tree walking functions
1117 * can be used.
1118 */
1119void __init unflatten_device_tree(void)
1120{
Grant Likely5063e252014-10-03 16:28:27 +01001121 __unflatten_device_tree(initial_boot_params, &of_root,
Grant Likely672c5442011-01-13 15:36:09 -07001122 early_init_dt_alloc_memory_arch);
Grant Likely41f88002009-11-23 20:07:01 -07001123
Robert P. J. Day4c7d6362013-05-30 05:38:08 -04001124 /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
Shawn Guo611cad72011-08-15 15:28:14 +08001125 of_alias_scan(early_init_dt_alloc_memory_arch);
Grant Likely41f88002009-11-23 20:07:01 -07001126}
Stephen Neuendorffere6ce1322010-11-18 15:54:56 -08001127
Rob Herringa8bf7522013-08-26 11:22:45 -05001128/**
1129 * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
1130 *
1131 * Copies and unflattens the device-tree passed by the firmware, creating the
1132 * tree of struct device_node. It also fills the "name" and "type"
1133 * pointers of the nodes so the normal device-tree walking functions
1134 * can be used. This should only be used when the FDT memory has not been
1135 * reserved such is the case when the FDT is built-in to the kernel init
1136 * section. If the FDT memory is reserved already then unflatten_device_tree
1137 * should be used instead.
1138 */
1139void __init unflatten_and_copy_device_tree(void)
1140{
James Hogan6f041e92013-11-21 13:44:14 +00001141 int size;
1142 void *dt;
1143
1144 if (!initial_boot_params) {
1145 pr_warn("No valid device tree found, continuing without\n");
1146 return;
1147 }
1148
Rob Herringc972de12014-04-01 22:48:01 -05001149 size = fdt_totalsize(initial_boot_params);
James Hogan6f041e92013-11-21 13:44:14 +00001150 dt = early_init_dt_alloc_memory_arch(size,
Rob Herringc972de12014-04-01 22:48:01 -05001151 roundup_pow_of_two(FDT_V17_SIZE));
Rob Herringa8bf7522013-08-26 11:22:45 -05001152
1153 if (dt) {
1154 memcpy(dt, initial_boot_params, size);
1155 initial_boot_params = dt;
1156 }
1157 unflatten_device_tree();
1158}
1159
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001160#ifdef CONFIG_SYSFS
1161static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj,
1162 struct bin_attribute *bin_attr,
1163 char *buf, loff_t off, size_t count)
Rob Herringb0a6fb32014-04-02 16:56:48 -05001164{
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001165 memcpy(buf, initial_boot_params + off, count);
1166 return count;
Rob Herringb0a6fb32014-04-02 16:56:48 -05001167}
Ard Biesheuvel08d53aa2014-11-14 18:05:35 +01001168
1169static int __init of_fdt_raw_init(void)
1170{
1171 static struct bin_attribute of_fdt_raw_attr =
1172 __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0);
1173
1174 if (!initial_boot_params)
1175 return 0;
1176
1177 if (of_fdt_crc32 != crc32_be(~0, initial_boot_params,
1178 fdt_totalsize(initial_boot_params))) {
1179 pr_warn("fdt: not creating '/sys/firmware/fdt': CRC check failed\n");
1180 return 0;
1181 }
1182 of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params);
1183 return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr);
1184}
1185late_initcall(of_fdt_raw_init);
Rob Herringb0a6fb32014-04-02 16:56:48 -05001186#endif
1187
Stephen Neuendorffere6ce1322010-11-18 15:54:56 -08001188#endif /* CONFIG_OF_EARLY_FLATTREE */