| 1 | /* |
| 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 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/initrd.h> |
| 14 | #include <linux/memblock.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/of.h> |
| 17 | #include <linux/of_fdt.h> |
| 18 | #include <linux/of_reserved_mem.h> |
| 19 | #include <linux/sizes.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/slab.h> |
| 23 | |
| 24 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
| 25 | #ifdef CONFIG_PPC |
| 26 | #include <asm/machdep.h> |
| 27 | #endif /* CONFIG_PPC */ |
| 28 | |
| 29 | #include <asm/page.h> |
| 30 | |
| 31 | char *of_fdt_get_string(struct boot_param_header *blob, u32 offset) |
| 32 | { |
| 33 | return ((char *)blob) + |
| 34 | be32_to_cpu(blob->off_dt_strings) + offset; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * of_fdt_get_property - Given a node in the given flat blob, return |
| 39 | * the property ptr |
| 40 | */ |
| 41 | void *of_fdt_get_property(struct boot_param_header *blob, |
| 42 | unsigned long node, const char *name, |
| 43 | unsigned long *size) |
| 44 | { |
| 45 | unsigned long p = node; |
| 46 | |
| 47 | do { |
| 48 | u32 tag = be32_to_cpup((__be32 *)p); |
| 49 | u32 sz, noff; |
| 50 | const char *nstr; |
| 51 | |
| 52 | p += 4; |
| 53 | if (tag == OF_DT_NOP) |
| 54 | continue; |
| 55 | if (tag != OF_DT_PROP) |
| 56 | return NULL; |
| 57 | |
| 58 | sz = be32_to_cpup((__be32 *)p); |
| 59 | noff = be32_to_cpup((__be32 *)(p + 4)); |
| 60 | p += 8; |
| 61 | if (be32_to_cpu(blob->version) < 0x10) |
| 62 | p = ALIGN(p, sz >= 8 ? 8 : 4); |
| 63 | |
| 64 | nstr = of_fdt_get_string(blob, noff); |
| 65 | if (nstr == NULL) { |
| 66 | pr_warning("Can't find property index name !\n"); |
| 67 | return NULL; |
| 68 | } |
| 69 | if (strcmp(name, nstr) == 0) { |
| 70 | if (size) |
| 71 | *size = sz; |
| 72 | return (void *)p; |
| 73 | } |
| 74 | p += sz; |
| 75 | p = ALIGN(p, 4); |
| 76 | } while (1); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * of_fdt_is_compatible - Return true if given node from the given blob has |
| 81 | * compat in its compatible list |
| 82 | * @blob: A device tree blob |
| 83 | * @node: node to test |
| 84 | * @compat: compatible string to compare with compatible list. |
| 85 | * |
| 86 | * On match, returns a non-zero value with smaller values returned for more |
| 87 | * specific compatible values. |
| 88 | */ |
| 89 | int of_fdt_is_compatible(struct boot_param_header *blob, |
| 90 | unsigned long node, const char *compat) |
| 91 | { |
| 92 | const char *cp; |
| 93 | unsigned long cplen, l, score = 0; |
| 94 | |
| 95 | cp = of_fdt_get_property(blob, node, "compatible", &cplen); |
| 96 | if (cp == NULL) |
| 97 | return 0; |
| 98 | while (cplen > 0) { |
| 99 | score++; |
| 100 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
| 101 | return score; |
| 102 | l = strlen(cp) + 1; |
| 103 | cp += l; |
| 104 | cplen -= l; |
| 105 | } |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * of_fdt_match - Return true if node matches a list of compatible values |
| 112 | */ |
| 113 | int of_fdt_match(struct boot_param_header *blob, unsigned long node, |
| 114 | const char *const *compat) |
| 115 | { |
| 116 | unsigned int tmp, score = 0; |
| 117 | |
| 118 | if (!compat) |
| 119 | return 0; |
| 120 | |
| 121 | while (*compat) { |
| 122 | tmp = of_fdt_is_compatible(blob, node, *compat); |
| 123 | if (tmp && (score == 0 || (tmp < score))) |
| 124 | score = tmp; |
| 125 | compat++; |
| 126 | } |
| 127 | |
| 128 | return score; |
| 129 | } |
| 130 | |
| 131 | static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
| 132 | unsigned long align) |
| 133 | { |
| 134 | void *res; |
| 135 | |
| 136 | *mem = ALIGN(*mem, align); |
| 137 | res = (void *)*mem; |
| 138 | *mem += size; |
| 139 | |
| 140 | return res; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree |
| 145 | * @blob: The parent device tree blob |
| 146 | * @mem: Memory chunk to use for allocating device nodes and properties |
| 147 | * @p: pointer to node in flat tree |
| 148 | * @dad: Parent struct device_node |
| 149 | * @allnextpp: pointer to ->allnext from last allocated device_node |
| 150 | * @fpsize: Size of the node path up at the current depth. |
| 151 | */ |
| 152 | static unsigned long unflatten_dt_node(struct boot_param_header *blob, |
| 153 | unsigned long mem, |
| 154 | unsigned long *p, |
| 155 | struct device_node *dad, |
| 156 | struct device_node ***allnextpp, |
| 157 | unsigned long fpsize) |
| 158 | { |
| 159 | struct device_node *np; |
| 160 | struct property *pp, **prev_pp = NULL; |
| 161 | char *pathp; |
| 162 | u32 tag; |
| 163 | unsigned int l, allocl; |
| 164 | int has_name = 0; |
| 165 | int new_format = 0; |
| 166 | |
| 167 | tag = be32_to_cpup((__be32 *)(*p)); |
| 168 | if (tag != OF_DT_BEGIN_NODE) { |
| 169 | pr_err("Weird tag at start of node: %x\n", tag); |
| 170 | return mem; |
| 171 | } |
| 172 | *p += 4; |
| 173 | pathp = (char *)*p; |
| 174 | l = allocl = strlen(pathp) + 1; |
| 175 | *p = ALIGN(*p + l, 4); |
| 176 | |
| 177 | /* version 0x10 has a more compact unit name here instead of the full |
| 178 | * path. we accumulate the full path size using "fpsize", we'll rebuild |
| 179 | * it later. We detect this because the first character of the name is |
| 180 | * not '/'. |
| 181 | */ |
| 182 | if ((*pathp) != '/') { |
| 183 | new_format = 1; |
| 184 | if (fpsize == 0) { |
| 185 | /* root node: special case. fpsize accounts for path |
| 186 | * plus terminating zero. root node only has '/', so |
| 187 | * fpsize should be 2, but we want to avoid the first |
| 188 | * level nodes to have two '/' so we use fpsize 1 here |
| 189 | */ |
| 190 | fpsize = 1; |
| 191 | allocl = 2; |
| 192 | l = 1; |
| 193 | *pathp = '\0'; |
| 194 | } else { |
| 195 | /* account for '/' and path size minus terminal 0 |
| 196 | * already in 'l' |
| 197 | */ |
| 198 | fpsize += l; |
| 199 | allocl = fpsize; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, |
| 204 | __alignof__(struct device_node)); |
| 205 | if (allnextpp) { |
| 206 | char *fn; |
| 207 | memset(np, 0, sizeof(*np)); |
| 208 | np->full_name = fn = ((char *)np) + sizeof(*np); |
| 209 | if (new_format) { |
| 210 | /* rebuild full path for new format */ |
| 211 | if (dad && dad->parent) { |
| 212 | strcpy(fn, dad->full_name); |
| 213 | #ifdef DEBUG |
| 214 | if ((strlen(fn) + l + 1) != allocl) { |
| 215 | pr_debug("%s: p: %d, l: %d, a: %d\n", |
| 216 | pathp, (int)strlen(fn), |
| 217 | l, allocl); |
| 218 | } |
| 219 | #endif |
| 220 | fn += strlen(fn); |
| 221 | } |
| 222 | *(fn++) = '/'; |
| 223 | } |
| 224 | memcpy(fn, pathp, l); |
| 225 | |
| 226 | prev_pp = &np->properties; |
| 227 | **allnextpp = np; |
| 228 | *allnextpp = &np->allnext; |
| 229 | if (dad != NULL) { |
| 230 | np->parent = dad; |
| 231 | /* we temporarily use the next field as `last_child'*/ |
| 232 | if (dad->next == NULL) |
| 233 | dad->child = np; |
| 234 | else |
| 235 | dad->next->sibling = np; |
| 236 | dad->next = np; |
| 237 | } |
| 238 | kref_init(&np->kref); |
| 239 | } |
| 240 | /* process properties */ |
| 241 | while (1) { |
| 242 | u32 sz, noff; |
| 243 | char *pname; |
| 244 | |
| 245 | tag = be32_to_cpup((__be32 *)(*p)); |
| 246 | if (tag == OF_DT_NOP) { |
| 247 | *p += 4; |
| 248 | continue; |
| 249 | } |
| 250 | if (tag != OF_DT_PROP) |
| 251 | break; |
| 252 | *p += 4; |
| 253 | sz = be32_to_cpup((__be32 *)(*p)); |
| 254 | noff = be32_to_cpup((__be32 *)((*p) + 4)); |
| 255 | *p += 8; |
| 256 | if (be32_to_cpu(blob->version) < 0x10) |
| 257 | *p = ALIGN(*p, sz >= 8 ? 8 : 4); |
| 258 | |
| 259 | pname = of_fdt_get_string(blob, noff); |
| 260 | if (pname == NULL) { |
| 261 | pr_info("Can't find property name in list !\n"); |
| 262 | break; |
| 263 | } |
| 264 | if (strcmp(pname, "name") == 0) |
| 265 | has_name = 1; |
| 266 | l = strlen(pname) + 1; |
| 267 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), |
| 268 | __alignof__(struct property)); |
| 269 | if (allnextpp) { |
| 270 | /* We accept flattened tree phandles either in |
| 271 | * ePAPR-style "phandle" properties, or the |
| 272 | * legacy "linux,phandle" properties. If both |
| 273 | * appear and have different values, things |
| 274 | * will get weird. Don't do that. */ |
| 275 | if ((strcmp(pname, "phandle") == 0) || |
| 276 | (strcmp(pname, "linux,phandle") == 0)) { |
| 277 | if (np->phandle == 0) |
| 278 | np->phandle = be32_to_cpup((__be32*)*p); |
| 279 | } |
| 280 | /* And we process the "ibm,phandle" property |
| 281 | * used in pSeries dynamic device tree |
| 282 | * stuff */ |
| 283 | if (strcmp(pname, "ibm,phandle") == 0) |
| 284 | np->phandle = be32_to_cpup((__be32 *)*p); |
| 285 | pp->name = pname; |
| 286 | pp->length = sz; |
| 287 | pp->value = (void *)*p; |
| 288 | *prev_pp = pp; |
| 289 | prev_pp = &pp->next; |
| 290 | } |
| 291 | *p = ALIGN((*p) + sz, 4); |
| 292 | } |
| 293 | /* with version 0x10 we may not have the name property, recreate |
| 294 | * it here from the unit name if absent |
| 295 | */ |
| 296 | if (!has_name) { |
| 297 | char *p1 = pathp, *ps = pathp, *pa = NULL; |
| 298 | int sz; |
| 299 | |
| 300 | while (*p1) { |
| 301 | if ((*p1) == '@') |
| 302 | pa = p1; |
| 303 | if ((*p1) == '/') |
| 304 | ps = p1 + 1; |
| 305 | p1++; |
| 306 | } |
| 307 | if (pa < ps) |
| 308 | pa = p1; |
| 309 | sz = (pa - ps) + 1; |
| 310 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, |
| 311 | __alignof__(struct property)); |
| 312 | if (allnextpp) { |
| 313 | pp->name = "name"; |
| 314 | pp->length = sz; |
| 315 | pp->value = pp + 1; |
| 316 | *prev_pp = pp; |
| 317 | prev_pp = &pp->next; |
| 318 | memcpy(pp->value, ps, sz - 1); |
| 319 | ((char *)pp->value)[sz - 1] = 0; |
| 320 | pr_debug("fixed up name for %s -> %s\n", pathp, |
| 321 | (char *)pp->value); |
| 322 | } |
| 323 | } |
| 324 | if (allnextpp) { |
| 325 | *prev_pp = NULL; |
| 326 | np->name = of_get_property(np, "name", NULL); |
| 327 | np->type = of_get_property(np, "device_type", NULL); |
| 328 | |
| 329 | if (!np->name) |
| 330 | np->name = "<NULL>"; |
| 331 | if (!np->type) |
| 332 | np->type = "<NULL>"; |
| 333 | } |
| 334 | while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
| 335 | if (tag == OF_DT_NOP) |
| 336 | *p += 4; |
| 337 | else |
| 338 | mem = unflatten_dt_node(blob, mem, p, np, allnextpp, |
| 339 | fpsize); |
| 340 | tag = be32_to_cpup((__be32 *)(*p)); |
| 341 | } |
| 342 | if (tag != OF_DT_END_NODE) { |
| 343 | pr_err("Weird tag at end of node: %x\n", tag); |
| 344 | return mem; |
| 345 | } |
| 346 | *p += 4; |
| 347 | return mem; |
| 348 | } |
| 349 | |
| 350 | /** |
| 351 | * __unflatten_device_tree - create tree of device_nodes from flat blob |
| 352 | * |
| 353 | * unflattens a device-tree, creating the |
| 354 | * tree of struct device_node. It also fills the "name" and "type" |
| 355 | * pointers of the nodes so the normal device-tree walking functions |
| 356 | * can be used. |
| 357 | * @blob: The blob to expand |
| 358 | * @mynodes: The device_node tree created by the call |
| 359 | * @dt_alloc: An allocator that provides a virtual address to memory |
| 360 | * for the resulting tree |
| 361 | */ |
| 362 | static void __unflatten_device_tree(struct boot_param_header *blob, |
| 363 | struct device_node **mynodes, |
| 364 | void * (*dt_alloc)(u64 size, u64 align)) |
| 365 | { |
| 366 | unsigned long start, mem, size; |
| 367 | struct device_node **allnextp = mynodes; |
| 368 | |
| 369 | pr_debug(" -> unflatten_device_tree()\n"); |
| 370 | |
| 371 | if (!blob) { |
| 372 | pr_debug("No device tree pointer\n"); |
| 373 | return; |
| 374 | } |
| 375 | |
| 376 | pr_debug("Unflattening device tree:\n"); |
| 377 | pr_debug("magic: %08x\n", be32_to_cpu(blob->magic)); |
| 378 | pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize)); |
| 379 | pr_debug("version: %08x\n", be32_to_cpu(blob->version)); |
| 380 | |
| 381 | if (be32_to_cpu(blob->magic) != OF_DT_HEADER) { |
| 382 | pr_err("Invalid device tree blob header\n"); |
| 383 | return; |
| 384 | } |
| 385 | |
| 386 | /* First pass, scan for size */ |
| 387 | start = ((unsigned long)blob) + |
| 388 | be32_to_cpu(blob->off_dt_struct); |
| 389 | size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0); |
| 390 | size = (size | 3) + 1; |
| 391 | |
| 392 | pr_debug(" size is %lx, allocating...\n", size); |
| 393 | |
| 394 | /* Allocate memory for the expanded device tree */ |
| 395 | mem = (unsigned long) |
| 396 | dt_alloc(size + 4, __alignof__(struct device_node)); |
| 397 | |
| 398 | memset((void *)mem, 0, size); |
| 399 | |
| 400 | ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef); |
| 401 | |
| 402 | pr_debug(" unflattening %lx...\n", mem); |
| 403 | |
| 404 | /* Second pass, do actual unflattening */ |
| 405 | start = ((unsigned long)blob) + |
| 406 | be32_to_cpu(blob->off_dt_struct); |
| 407 | unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0); |
| 408 | if (be32_to_cpup((__be32 *)start) != OF_DT_END) |
| 409 | pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start)); |
| 410 | if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef) |
| 411 | pr_warning("End of tree marker overwritten: %08x\n", |
| 412 | be32_to_cpu(((__be32 *)mem)[size / 4])); |
| 413 | *allnextp = NULL; |
| 414 | |
| 415 | pr_debug(" <- unflatten_device_tree()\n"); |
| 416 | } |
| 417 | |
| 418 | static void *kernel_tree_alloc(u64 size, u64 align) |
| 419 | { |
| 420 | return kzalloc(size, GFP_KERNEL); |
| 421 | } |
| 422 | |
| 423 | /** |
| 424 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob |
| 425 | * |
| 426 | * unflattens the device-tree passed by the firmware, creating the |
| 427 | * tree of struct device_node. It also fills the "name" and "type" |
| 428 | * pointers of the nodes so the normal device-tree walking functions |
| 429 | * can be used. |
| 430 | */ |
| 431 | void of_fdt_unflatten_tree(unsigned long *blob, |
| 432 | struct device_node **mynodes) |
| 433 | { |
| 434 | struct boot_param_header *device_tree = |
| 435 | (struct boot_param_header *)blob; |
| 436 | __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc); |
| 437 | } |
| 438 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); |
| 439 | |
| 440 | /* Everything below here references initial_boot_params directly. */ |
| 441 | int __initdata dt_root_addr_cells; |
| 442 | int __initdata dt_root_size_cells; |
| 443 | |
| 444 | struct boot_param_header *initial_boot_params; |
| 445 | |
| 446 | #ifdef CONFIG_OF_EARLY_FLATTREE |
| 447 | |
| 448 | /** |
| 449 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property |
| 450 | */ |
| 451 | static int __init __reserved_mem_reserve_reg(unsigned long node, |
| 452 | const char *uname) |
| 453 | { |
| 454 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); |
| 455 | phys_addr_t base, size; |
| 456 | unsigned long len; |
| 457 | __be32 *prop; |
| 458 | int nomap, first = 1; |
| 459 | |
| 460 | prop = of_get_flat_dt_prop(node, "reg", &len); |
| 461 | if (!prop) |
| 462 | return -ENOENT; |
| 463 | |
| 464 | if (len && len % t_len != 0) { |
| 465 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", |
| 466 | uname); |
| 467 | return -EINVAL; |
| 468 | } |
| 469 | |
| 470 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; |
| 471 | |
| 472 | while (len >= t_len) { |
| 473 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); |
| 474 | size = dt_mem_next_cell(dt_root_size_cells, &prop); |
| 475 | |
| 476 | if (base && size && |
| 477 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
| 478 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", |
| 479 | uname, &base, (unsigned long)size / SZ_1M); |
| 480 | else |
| 481 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", |
| 482 | uname, &base, (unsigned long)size / SZ_1M); |
| 483 | |
| 484 | len -= t_len; |
| 485 | if (first) { |
| 486 | fdt_reserved_mem_save_node(node, uname, base, size); |
| 487 | first = 0; |
| 488 | } |
| 489 | } |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | /** |
| 494 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided |
| 495 | * in /reserved-memory matches the values supported by the current implementation, |
| 496 | * also check if ranges property has been provided |
| 497 | */ |
| 498 | static int __reserved_mem_check_root(unsigned long node) |
| 499 | { |
| 500 | __be32 *prop; |
| 501 | |
| 502 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
| 503 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) |
| 504 | return -EINVAL; |
| 505 | |
| 506 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); |
| 507 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) |
| 508 | return -EINVAL; |
| 509 | |
| 510 | prop = of_get_flat_dt_prop(node, "ranges", NULL); |
| 511 | if (!prop) |
| 512 | return -EINVAL; |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory |
| 518 | */ |
| 519 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, |
| 520 | int depth, void *data) |
| 521 | { |
| 522 | static int found; |
| 523 | const char *status; |
| 524 | int err; |
| 525 | |
| 526 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { |
| 527 | if (__reserved_mem_check_root(node) != 0) { |
| 528 | pr_err("Reserved memory: unsupported node format, ignoring\n"); |
| 529 | /* break scan */ |
| 530 | return 1; |
| 531 | } |
| 532 | found = 1; |
| 533 | /* scan next node */ |
| 534 | return 0; |
| 535 | } else if (!found) { |
| 536 | /* scan next node */ |
| 537 | return 0; |
| 538 | } else if (found && depth < 2) { |
| 539 | /* scanning of /reserved-memory has been finished */ |
| 540 | return 1; |
| 541 | } |
| 542 | |
| 543 | status = of_get_flat_dt_prop(node, "status", NULL); |
| 544 | if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) |
| 545 | return 0; |
| 546 | |
| 547 | err = __reserved_mem_reserve_reg(node, uname); |
| 548 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) |
| 549 | fdt_reserved_mem_save_node(node, uname, 0, 0); |
| 550 | |
| 551 | /* scan next node */ |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | /** |
| 556 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions |
| 557 | * |
| 558 | * This function grabs memory from early allocator for device exclusive use |
| 559 | * defined in device tree structures. It should be called by arch specific code |
| 560 | * once the early allocator (i.e. memblock) has been fully activated. |
| 561 | */ |
| 562 | void __init early_init_fdt_scan_reserved_mem(void) |
| 563 | { |
| 564 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
| 565 | fdt_init_reserved_mem(); |
| 566 | } |
| 567 | |
| 568 | /** |
| 569 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. |
| 570 | * @it: callback function |
| 571 | * @data: context data pointer |
| 572 | * |
| 573 | * This function is used to scan the flattened device-tree, it is |
| 574 | * used to extract the memory information at boot before we can |
| 575 | * unflatten the tree |
| 576 | */ |
| 577 | int __init of_scan_flat_dt(int (*it)(unsigned long node, |
| 578 | const char *uname, int depth, |
| 579 | void *data), |
| 580 | void *data) |
| 581 | { |
| 582 | unsigned long p = ((unsigned long)initial_boot_params) + |
| 583 | be32_to_cpu(initial_boot_params->off_dt_struct); |
| 584 | int rc = 0; |
| 585 | int depth = -1; |
| 586 | |
| 587 | do { |
| 588 | u32 tag = be32_to_cpup((__be32 *)p); |
| 589 | const char *pathp; |
| 590 | |
| 591 | p += 4; |
| 592 | if (tag == OF_DT_END_NODE) { |
| 593 | depth--; |
| 594 | continue; |
| 595 | } |
| 596 | if (tag == OF_DT_NOP) |
| 597 | continue; |
| 598 | if (tag == OF_DT_END) |
| 599 | break; |
| 600 | if (tag == OF_DT_PROP) { |
| 601 | u32 sz = be32_to_cpup((__be32 *)p); |
| 602 | p += 8; |
| 603 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
| 604 | p = ALIGN(p, sz >= 8 ? 8 : 4); |
| 605 | p += sz; |
| 606 | p = ALIGN(p, 4); |
| 607 | continue; |
| 608 | } |
| 609 | if (tag != OF_DT_BEGIN_NODE) { |
| 610 | pr_err("Invalid tag %x in flat device tree!\n", tag); |
| 611 | return -EINVAL; |
| 612 | } |
| 613 | depth++; |
| 614 | pathp = (char *)p; |
| 615 | p = ALIGN(p + strlen(pathp) + 1, 4); |
| 616 | if (*pathp == '/') |
| 617 | pathp = kbasename(pathp); |
| 618 | rc = it(p, pathp, depth, data); |
| 619 | if (rc != 0) |
| 620 | break; |
| 621 | } while (1); |
| 622 | |
| 623 | return rc; |
| 624 | } |
| 625 | |
| 626 | /** |
| 627 | * of_get_flat_dt_root - find the root node in the flat blob |
| 628 | */ |
| 629 | unsigned long __init of_get_flat_dt_root(void) |
| 630 | { |
| 631 | unsigned long p = ((unsigned long)initial_boot_params) + |
| 632 | be32_to_cpu(initial_boot_params->off_dt_struct); |
| 633 | |
| 634 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) |
| 635 | p += 4; |
| 636 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); |
| 637 | p += 4; |
| 638 | return ALIGN(p + strlen((char *)p) + 1, 4); |
| 639 | } |
| 640 | |
| 641 | /** |
| 642 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr |
| 643 | * |
| 644 | * This function can be used within scan_flattened_dt callback to get |
| 645 | * access to properties |
| 646 | */ |
| 647 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
| 648 | unsigned long *size) |
| 649 | { |
| 650 | return of_fdt_get_property(initial_boot_params, node, name, size); |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list |
| 655 | * @node: node to test |
| 656 | * @compat: compatible string to compare with compatible list. |
| 657 | */ |
| 658 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) |
| 659 | { |
| 660 | return of_fdt_is_compatible(initial_boot_params, node, compat); |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * of_flat_dt_match - Return true if node matches a list of compatible values |
| 665 | */ |
| 666 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
| 667 | { |
| 668 | return of_fdt_match(initial_boot_params, node, compat); |
| 669 | } |
| 670 | |
| 671 | struct fdt_scan_status { |
| 672 | const char *name; |
| 673 | int namelen; |
| 674 | int depth; |
| 675 | int found; |
| 676 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); |
| 677 | void *data; |
| 678 | }; |
| 679 | |
| 680 | /** |
| 681 | * fdt_scan_node_by_path - iterator for of_scan_flat_dt_by_path function |
| 682 | */ |
| 683 | static int __init fdt_scan_node_by_path(unsigned long node, const char *uname, |
| 684 | int depth, void *data) |
| 685 | { |
| 686 | struct fdt_scan_status *st = data; |
| 687 | |
| 688 | /* |
| 689 | * if scan at the requested fdt node has been completed, |
| 690 | * return -ENXIO to abort further scanning |
| 691 | */ |
| 692 | if (depth <= st->depth) |
| 693 | return -ENXIO; |
| 694 | |
| 695 | /* requested fdt node has been found, so call iterator function */ |
| 696 | if (st->found) |
| 697 | return st->iterator(node, uname, depth, st->data); |
| 698 | |
| 699 | /* check if scanning automata is entering next level of fdt nodes */ |
| 700 | if (depth == st->depth + 1 && |
| 701 | strncmp(st->name, uname, st->namelen) == 0 && |
| 702 | uname[st->namelen] == 0) { |
| 703 | st->depth += 1; |
| 704 | if (st->name[st->namelen] == 0) { |
| 705 | st->found = 1; |
| 706 | } else { |
| 707 | const char *next = st->name + st->namelen + 1; |
| 708 | st->name = next; |
| 709 | st->namelen = strcspn(next, "/"); |
| 710 | } |
| 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | /* scan next fdt node */ |
| 715 | return 0; |
| 716 | } |
| 717 | |
| 718 | /** |
| 719 | * of_scan_flat_dt_by_path - scan flattened tree blob and call callback on each |
| 720 | * child of the given path. |
| 721 | * @path: path to start searching for children |
| 722 | * @it: callback function |
| 723 | * @data: context data pointer |
| 724 | * |
| 725 | * This function is used to scan the flattened device-tree starting from the |
| 726 | * node given by path. It is used to extract information (like reserved |
| 727 | * memory), which is required on ealy boot before we can unflatten the tree. |
| 728 | */ |
| 729 | int __init of_scan_flat_dt_by_path(const char *path, |
| 730 | int (*it)(unsigned long node, const char *name, int depth, void *data), |
| 731 | void *data) |
| 732 | { |
| 733 | struct fdt_scan_status st = {path, 0, -1, 0, it, data}; |
| 734 | int ret = 0; |
| 735 | |
| 736 | if (initial_boot_params) |
| 737 | ret = of_scan_flat_dt(fdt_scan_node_by_path, &st); |
| 738 | |
| 739 | if (!st.found) |
| 740 | return -ENOENT; |
| 741 | else if (ret == -ENXIO) /* scan has been completed */ |
| 742 | return 0; |
| 743 | else |
| 744 | return ret; |
| 745 | } |
| 746 | |
| 747 | #ifdef CONFIG_BLK_DEV_INITRD |
| 748 | /** |
| 749 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree |
| 750 | * @node: reference to node containing initrd location ('chosen') |
| 751 | */ |
| 752 | void __init early_init_dt_check_for_initrd(unsigned long node) |
| 753 | { |
| 754 | unsigned long start, end, len; |
| 755 | __be32 *prop; |
| 756 | |
| 757 | pr_debug("Looking for initrd properties... "); |
| 758 | |
| 759 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); |
| 760 | if (!prop) |
| 761 | return; |
| 762 | start = of_read_ulong(prop, len/4); |
| 763 | |
| 764 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); |
| 765 | if (!prop) |
| 766 | return; |
| 767 | end = of_read_ulong(prop, len/4); |
| 768 | |
| 769 | early_init_dt_setup_initrd_arch(start, end); |
| 770 | pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end); |
| 771 | } |
| 772 | #else |
| 773 | inline void early_init_dt_check_for_initrd(unsigned long node) |
| 774 | { |
| 775 | } |
| 776 | #endif /* CONFIG_BLK_DEV_INITRD */ |
| 777 | |
| 778 | /** |
| 779 | * early_init_dt_scan_root - fetch the top level address and size cells |
| 780 | */ |
| 781 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, |
| 782 | int depth, void *data) |
| 783 | { |
| 784 | __be32 *prop; |
| 785 | |
| 786 | if (depth != 0) |
| 787 | return 0; |
| 788 | |
| 789 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
| 790 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; |
| 791 | |
| 792 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
| 793 | if (prop) |
| 794 | dt_root_size_cells = be32_to_cpup(prop); |
| 795 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
| 796 | |
| 797 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); |
| 798 | if (prop) |
| 799 | dt_root_addr_cells = be32_to_cpup(prop); |
| 800 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
| 801 | |
| 802 | /* break now */ |
| 803 | return 1; |
| 804 | } |
| 805 | |
| 806 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
| 807 | { |
| 808 | __be32 *p = *cellp; |
| 809 | |
| 810 | *cellp = p + s; |
| 811 | return of_read_number(p, s); |
| 812 | } |
| 813 | |
| 814 | /** |
| 815 | * early_init_dt_scan_memory - Look for an parse memory nodes |
| 816 | */ |
| 817 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, |
| 818 | int depth, void *data) |
| 819 | { |
| 820 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
| 821 | __be32 *reg, *endp; |
| 822 | unsigned long l; |
| 823 | |
| 824 | /* We are scanning "memory" nodes only */ |
| 825 | if (type == NULL) { |
| 826 | /* |
| 827 | * The longtrail doesn't have a device_type on the |
| 828 | * /memory node, so look for the node called /memory@0. |
| 829 | */ |
| 830 | if (depth != 1 || strcmp(uname, "memory@0") != 0) |
| 831 | return 0; |
| 832 | } else if (strcmp(type, "memory") != 0) |
| 833 | return 0; |
| 834 | |
| 835 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); |
| 836 | if (reg == NULL) |
| 837 | reg = of_get_flat_dt_prop(node, "reg", &l); |
| 838 | if (reg == NULL) |
| 839 | return 0; |
| 840 | |
| 841 | endp = reg + (l / sizeof(__be32)); |
| 842 | |
| 843 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", |
| 844 | uname, l, reg[0], reg[1], reg[2], reg[3]); |
| 845 | |
| 846 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { |
| 847 | u64 base, size; |
| 848 | |
| 849 | base = dt_mem_next_cell(dt_root_addr_cells, ®); |
| 850 | size = dt_mem_next_cell(dt_root_size_cells, ®); |
| 851 | |
| 852 | if (size == 0) |
| 853 | continue; |
| 854 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, |
| 855 | (unsigned long long)size); |
| 856 | |
| 857 | early_init_dt_add_memory_arch(base, size); |
| 858 | } |
| 859 | |
| 860 | return 0; |
| 861 | } |
| 862 | |
| 863 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
| 864 | phys_addr_t size, bool nomap) |
| 865 | { |
| 866 | if (memblock_is_region_reserved(base, size)) |
| 867 | return -EBUSY; |
| 868 | if (nomap) |
| 869 | return memblock_remove(base, size); |
| 870 | return memblock_reserve(base, size); |
| 871 | } |
| 872 | |
| 873 | /* |
| 874 | * Convert configs to something easy to use in C code |
| 875 | */ |
| 876 | #if defined(CONFIG_CMDLINE_FORCE) |
| 877 | static const int overwrite_incoming_cmdline = 1; |
| 878 | static const int read_dt_cmdline; |
| 879 | static const int concat_cmdline; |
| 880 | #elif defined(CONFIG_CMDLINE_EXTEND) |
| 881 | static const int overwrite_incoming_cmdline; |
| 882 | static const int read_dt_cmdline = 1; |
| 883 | static const int concat_cmdline = 1; |
| 884 | #else /* CMDLINE_FROM_BOOTLOADER */ |
| 885 | static const int overwrite_incoming_cmdline; |
| 886 | static const int read_dt_cmdline = 1; |
| 887 | static const int concat_cmdline; |
| 888 | #endif |
| 889 | |
| 890 | #ifdef CONFIG_CMDLINE |
| 891 | static const char *config_cmdline = CONFIG_CMDLINE; |
| 892 | #else |
| 893 | static const char *config_cmdline = ""; |
| 894 | #endif |
| 895 | |
| 896 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
| 897 | int depth, void *data) |
| 898 | { |
| 899 | unsigned long l = 0; |
| 900 | char *p = NULL; |
| 901 | char *cmdline = data; |
| 902 | |
| 903 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); |
| 904 | |
| 905 | if (depth != 1 || !cmdline || |
| 906 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
| 907 | return 0; |
| 908 | |
| 909 | early_init_dt_check_for_initrd(node); |
| 910 | |
| 911 | /* Put CONFIG_CMDLINE in if forced or if data had nothing in it to start */ |
| 912 | if (overwrite_incoming_cmdline || !cmdline[0]) |
| 913 | strlcpy(cmdline, config_cmdline, COMMAND_LINE_SIZE); |
| 914 | |
| 915 | /* Retrieve command line unless forcing */ |
| 916 | if (read_dt_cmdline) |
| 917 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
| 918 | |
| 919 | if (p != NULL && l > 0) { |
| 920 | if (concat_cmdline) { |
| 921 | int cmdline_len; |
| 922 | int copy_len; |
| 923 | strlcat(cmdline, " ", COMMAND_LINE_SIZE); |
| 924 | cmdline_len = strlen(cmdline); |
| 925 | copy_len = COMMAND_LINE_SIZE - cmdline_len - 1; |
| 926 | copy_len = min((int)l, copy_len); |
| 927 | strncpy(cmdline + cmdline_len, p, copy_len); |
| 928 | cmdline[cmdline_len + copy_len] = '\0'; |
| 929 | } else { |
| 930 | strlcpy(cmdline, p, min((int)l, COMMAND_LINE_SIZE)); |
| 931 | } |
| 932 | } |
| 933 | |
| 934 | pr_debug("Command line is: %s\n", (char*)data); |
| 935 | |
| 936 | /* break now */ |
| 937 | return 1; |
| 938 | } |
| 939 | |
| 940 | #ifdef CONFIG_HAVE_MEMBLOCK |
| 941 | /* |
| 942 | * called from unflatten_device_tree() to bootstrap devicetree itself |
| 943 | * Architectures can override this definition if memblock isn't used |
| 944 | */ |
| 945 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) |
| 946 | { |
| 947 | return __va(memblock_alloc(size, align)); |
| 948 | } |
| 949 | #else |
| 950 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
| 951 | phys_addr_t size, bool nomap) |
| 952 | { |
| 953 | pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n", |
| 954 | base, size, nomap ? " (nomap)" : ""); |
| 955 | return -ENOSYS; |
| 956 | } |
| 957 | #endif |
| 958 | |
| 959 | /** |
| 960 | * unflatten_device_tree - create tree of device_nodes from flat blob |
| 961 | * |
| 962 | * unflattens the device-tree passed by the firmware, creating the |
| 963 | * tree of struct device_node. It also fills the "name" and "type" |
| 964 | * pointers of the nodes so the normal device-tree walking functions |
| 965 | * can be used. |
| 966 | */ |
| 967 | void __init unflatten_device_tree(void) |
| 968 | { |
| 969 | __unflatten_device_tree(initial_boot_params, &of_allnodes, |
| 970 | early_init_dt_alloc_memory_arch); |
| 971 | |
| 972 | /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */ |
| 973 | of_alias_scan(early_init_dt_alloc_memory_arch); |
| 974 | } |
| 975 | |
| 976 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |