fdt_support.c 43 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2007
  4. * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
  5. *
  6. * Copyright 2010-2011 Freescale Semiconductor, Inc.
  7. */
  8. #include <common.h>
  9. #include <stdio_dev.h>
  10. #include <linux/ctype.h>
  11. #include <linux/types.h>
  12. #include <asm/global_data.h>
  13. #include <linux/libfdt.h>
  14. #include <fdt_support.h>
  15. #include <exports.h>
  16. #include <fdtdec.h>
  17. /**
  18. * fdt_getprop_u32_default_node - Return a node's property or a default
  19. *
  20. * @fdt: ptr to device tree
  21. * @off: offset of node
  22. * @cell: cell offset in property
  23. * @prop: property name
  24. * @dflt: default value if the property isn't found
  25. *
  26. * Convenience function to return a node's property or a default value if
  27. * the property doesn't exist.
  28. */
  29. u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
  30. const char *prop, const u32 dflt)
  31. {
  32. const fdt32_t *val;
  33. int len;
  34. val = fdt_getprop(fdt, off, prop, &len);
  35. /* Check if property exists */
  36. if (!val)
  37. return dflt;
  38. /* Check if property is long enough */
  39. if (len < ((cell + 1) * sizeof(uint32_t)))
  40. return dflt;
  41. return fdt32_to_cpu(*val);
  42. }
  43. /**
  44. * fdt_getprop_u32_default - Find a node and return it's property or a default
  45. *
  46. * @fdt: ptr to device tree
  47. * @path: path of node
  48. * @prop: property name
  49. * @dflt: default value if the property isn't found
  50. *
  51. * Convenience function to find a node and return it's property or a
  52. * default value if it doesn't exist.
  53. */
  54. u32 fdt_getprop_u32_default(const void *fdt, const char *path,
  55. const char *prop, const u32 dflt)
  56. {
  57. int off;
  58. off = fdt_path_offset(fdt, path);
  59. if (off < 0)
  60. return dflt;
  61. return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
  62. }
  63. /**
  64. * fdt_find_and_setprop: Find a node and set it's property
  65. *
  66. * @fdt: ptr to device tree
  67. * @node: path of node
  68. * @prop: property name
  69. * @val: ptr to new value
  70. * @len: length of new property value
  71. * @create: flag to create the property if it doesn't exist
  72. *
  73. * Convenience function to directly set a property given the path to the node.
  74. */
  75. int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
  76. const void *val, int len, int create)
  77. {
  78. int nodeoff = fdt_path_offset(fdt, node);
  79. if (nodeoff < 0)
  80. return nodeoff;
  81. if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
  82. return 0; /* create flag not set; so exit quietly */
  83. return fdt_setprop(fdt, nodeoff, prop, val, len);
  84. }
  85. /**
  86. * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
  87. *
  88. * @fdt: pointer to the device tree blob
  89. * @parentoffset: structure block offset of a node
  90. * @name: name of the subnode to locate
  91. *
  92. * fdt_subnode_offset() finds a subnode of the node with a given name.
  93. * If the subnode does not exist, it will be created.
  94. */
  95. int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
  96. {
  97. int offset;
  98. offset = fdt_subnode_offset(fdt, parentoffset, name);
  99. if (offset == -FDT_ERR_NOTFOUND)
  100. offset = fdt_add_subnode(fdt, parentoffset, name);
  101. if (offset < 0)
  102. printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
  103. return offset;
  104. }
  105. /* rename to CONFIG_OF_STDOUT_PATH ? */
  106. #if defined(OF_STDOUT_PATH)
  107. static int fdt_fixup_stdout(void *fdt, int chosenoff)
  108. {
  109. return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
  110. OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
  111. }
  112. #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
  113. static int fdt_fixup_stdout(void *fdt, int chosenoff)
  114. {
  115. int err;
  116. int aliasoff;
  117. char sername[9] = { 0 };
  118. const void *path;
  119. int len;
  120. char tmp[256]; /* long enough */
  121. sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
  122. aliasoff = fdt_path_offset(fdt, "/aliases");
  123. if (aliasoff < 0) {
  124. err = aliasoff;
  125. goto noalias;
  126. }
  127. path = fdt_getprop(fdt, aliasoff, sername, &len);
  128. if (!path) {
  129. err = len;
  130. goto noalias;
  131. }
  132. /* fdt_setprop may break "path" so we copy it to tmp buffer */
  133. memcpy(tmp, path, len);
  134. err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
  135. if (err < 0)
  136. printf("WARNING: could not set linux,stdout-path %s.\n",
  137. fdt_strerror(err));
  138. return err;
  139. noalias:
  140. printf("WARNING: %s: could not read %s alias: %s\n",
  141. __func__, sername, fdt_strerror(err));
  142. return 0;
  143. }
  144. #else
  145. static int fdt_fixup_stdout(void *fdt, int chosenoff)
  146. {
  147. return 0;
  148. }
  149. #endif
  150. static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
  151. uint64_t val, int is_u64)
  152. {
  153. if (is_u64)
  154. return fdt_setprop_u64(fdt, nodeoffset, name, val);
  155. else
  156. return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
  157. }
  158. int fdt_root(void *fdt)
  159. {
  160. char *serial;
  161. int err;
  162. err = fdt_check_header(fdt);
  163. if (err < 0) {
  164. printf("fdt_root: %s\n", fdt_strerror(err));
  165. return err;
  166. }
  167. serial = env_get("serial#");
  168. if (serial) {
  169. err = fdt_setprop(fdt, 0, "serial-number", serial,
  170. strlen(serial) + 1);
  171. if (err < 0) {
  172. printf("WARNING: could not set serial-number %s.\n",
  173. fdt_strerror(err));
  174. return err;
  175. }
  176. }
  177. return 0;
  178. }
  179. int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
  180. {
  181. int nodeoffset;
  182. int err, j, total;
  183. int is_u64;
  184. uint64_t addr, size;
  185. /* just return if the size of initrd is zero */
  186. if (initrd_start == initrd_end)
  187. return 0;
  188. /* find or create "/chosen" node. */
  189. nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
  190. if (nodeoffset < 0)
  191. return nodeoffset;
  192. total = fdt_num_mem_rsv(fdt);
  193. /*
  194. * Look for an existing entry and update it. If we don't find
  195. * the entry, we will j be the next available slot.
  196. */
  197. for (j = 0; j < total; j++) {
  198. err = fdt_get_mem_rsv(fdt, j, &addr, &size);
  199. if (addr == initrd_start) {
  200. fdt_del_mem_rsv(fdt, j);
  201. break;
  202. }
  203. }
  204. err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
  205. if (err < 0) {
  206. printf("fdt_initrd: %s\n", fdt_strerror(err));
  207. return err;
  208. }
  209. is_u64 = (fdt_address_cells(fdt, 0) == 2);
  210. err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
  211. (uint64_t)initrd_start, is_u64);
  212. if (err < 0) {
  213. printf("WARNING: could not set linux,initrd-start %s.\n",
  214. fdt_strerror(err));
  215. return err;
  216. }
  217. err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
  218. (uint64_t)initrd_end, is_u64);
  219. if (err < 0) {
  220. printf("WARNING: could not set linux,initrd-end %s.\n",
  221. fdt_strerror(err));
  222. return err;
  223. }
  224. return 0;
  225. }
  226. int fdt_chosen(void *fdt)
  227. {
  228. int nodeoffset;
  229. int err;
  230. char *str; /* used to set string properties */
  231. err = fdt_check_header(fdt);
  232. if (err < 0) {
  233. printf("fdt_chosen: %s\n", fdt_strerror(err));
  234. return err;
  235. }
  236. /* find or create "/chosen" node. */
  237. nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
  238. if (nodeoffset < 0)
  239. return nodeoffset;
  240. str = env_get("bootargs");
  241. if (str) {
  242. err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
  243. strlen(str) + 1);
  244. if (err < 0) {
  245. printf("WARNING: could not set bootargs %s.\n",
  246. fdt_strerror(err));
  247. return err;
  248. }
  249. }
  250. return fdt_fixup_stdout(fdt, nodeoffset);
  251. }
  252. void do_fixup_by_path(void *fdt, const char *path, const char *prop,
  253. const void *val, int len, int create)
  254. {
  255. #if defined(DEBUG)
  256. int i;
  257. debug("Updating property '%s/%s' = ", path, prop);
  258. for (i = 0; i < len; i++)
  259. debug(" %.2x", *(u8*)(val+i));
  260. debug("\n");
  261. #endif
  262. int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
  263. if (rc)
  264. printf("Unable to update property %s:%s, err=%s\n",
  265. path, prop, fdt_strerror(rc));
  266. }
  267. void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
  268. u32 val, int create)
  269. {
  270. fdt32_t tmp = cpu_to_fdt32(val);
  271. do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
  272. }
  273. void do_fixup_by_prop(void *fdt,
  274. const char *pname, const void *pval, int plen,
  275. const char *prop, const void *val, int len,
  276. int create)
  277. {
  278. int off;
  279. #if defined(DEBUG)
  280. int i;
  281. debug("Updating property '%s' = ", prop);
  282. for (i = 0; i < len; i++)
  283. debug(" %.2x", *(u8*)(val+i));
  284. debug("\n");
  285. #endif
  286. off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
  287. while (off != -FDT_ERR_NOTFOUND) {
  288. if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
  289. fdt_setprop(fdt, off, prop, val, len);
  290. off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
  291. }
  292. }
  293. void do_fixup_by_prop_u32(void *fdt,
  294. const char *pname, const void *pval, int plen,
  295. const char *prop, u32 val, int create)
  296. {
  297. fdt32_t tmp = cpu_to_fdt32(val);
  298. do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
  299. }
  300. void do_fixup_by_compat(void *fdt, const char *compat,
  301. const char *prop, const void *val, int len, int create)
  302. {
  303. int off = -1;
  304. #if defined(DEBUG)
  305. int i;
  306. debug("Updating property '%s' = ", prop);
  307. for (i = 0; i < len; i++)
  308. debug(" %.2x", *(u8*)(val+i));
  309. debug("\n");
  310. #endif
  311. off = fdt_node_offset_by_compatible(fdt, -1, compat);
  312. while (off != -FDT_ERR_NOTFOUND) {
  313. if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
  314. fdt_setprop(fdt, off, prop, val, len);
  315. off = fdt_node_offset_by_compatible(fdt, off, compat);
  316. }
  317. }
  318. void do_fixup_by_compat_u32(void *fdt, const char *compat,
  319. const char *prop, u32 val, int create)
  320. {
  321. fdt32_t tmp = cpu_to_fdt32(val);
  322. do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
  323. }
  324. #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
  325. /*
  326. * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
  327. */
  328. static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
  329. int n)
  330. {
  331. int i;
  332. int address_cells = fdt_address_cells(fdt, 0);
  333. int size_cells = fdt_size_cells(fdt, 0);
  334. char *p = buf;
  335. for (i = 0; i < n; i++) {
  336. if (address_cells == 2)
  337. *(fdt64_t *)p = cpu_to_fdt64(address[i]);
  338. else
  339. *(fdt32_t *)p = cpu_to_fdt32(address[i]);
  340. p += 4 * address_cells;
  341. if (size_cells == 2)
  342. *(fdt64_t *)p = cpu_to_fdt64(size[i]);
  343. else
  344. *(fdt32_t *)p = cpu_to_fdt32(size[i]);
  345. p += 4 * size_cells;
  346. }
  347. return p - (char *)buf;
  348. }
  349. #if CONFIG_NR_DRAM_BANKS > 4
  350. #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
  351. #else
  352. #define MEMORY_BANKS_MAX 4
  353. #endif
  354. int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
  355. {
  356. int err, nodeoffset;
  357. int len, i;
  358. u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
  359. if (banks > MEMORY_BANKS_MAX) {
  360. printf("%s: num banks %d exceeds hardcoded limit %d."
  361. " Recompile with higher MEMORY_BANKS_MAX?\n",
  362. __FUNCTION__, banks, MEMORY_BANKS_MAX);
  363. return -1;
  364. }
  365. err = fdt_check_header(blob);
  366. if (err < 0) {
  367. printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
  368. return err;
  369. }
  370. /* find or create "/memory" node. */
  371. nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
  372. if (nodeoffset < 0)
  373. return nodeoffset;
  374. err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
  375. sizeof("memory"));
  376. if (err < 0) {
  377. printf("WARNING: could not set %s %s.\n", "device_type",
  378. fdt_strerror(err));
  379. return err;
  380. }
  381. for (i = 0; i < banks; i++) {
  382. if (start[i] == 0 && size[i] == 0)
  383. break;
  384. }
  385. banks = i;
  386. if (!banks)
  387. return 0;
  388. for (i = 0; i < banks; i++)
  389. if (start[i] == 0 && size[i] == 0)
  390. break;
  391. banks = i;
  392. len = fdt_pack_reg(blob, tmp, start, size, banks);
  393. err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
  394. if (err < 0) {
  395. printf("WARNING: could not set %s %s.\n",
  396. "reg", fdt_strerror(err));
  397. return err;
  398. }
  399. return 0;
  400. }
  401. #endif
  402. int fdt_fixup_memory(void *blob, u64 start, u64 size)
  403. {
  404. return fdt_fixup_memory_banks(blob, &start, &size, 1);
  405. }
  406. void fdt_fixup_ethernet(void *fdt)
  407. {
  408. int i = 0, j, prop;
  409. char *tmp, *end;
  410. char mac[16];
  411. const char *path;
  412. unsigned char mac_addr[ARP_HLEN];
  413. int offset;
  414. #ifdef FDT_SEQ_MACADDR_FROM_ENV
  415. int nodeoff;
  416. const struct fdt_property *fdt_prop;
  417. #endif
  418. if (fdt_path_offset(fdt, "/aliases") < 0)
  419. return;
  420. /* Cycle through all aliases */
  421. for (prop = 0; ; prop++) {
  422. const char *name;
  423. /* FDT might have been edited, recompute the offset */
  424. offset = fdt_first_property_offset(fdt,
  425. fdt_path_offset(fdt, "/aliases"));
  426. /* Select property number 'prop' */
  427. for (j = 0; j < prop; j++)
  428. offset = fdt_next_property_offset(fdt, offset);
  429. if (offset < 0)
  430. break;
  431. path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
  432. if (!strncmp(name, "ethernet", 8)) {
  433. /* Treat plain "ethernet" same as "ethernet0". */
  434. if (!strcmp(name, "ethernet")
  435. #ifdef FDT_SEQ_MACADDR_FROM_ENV
  436. || !strcmp(name, "ethernet0")
  437. #endif
  438. )
  439. i = 0;
  440. #ifndef FDT_SEQ_MACADDR_FROM_ENV
  441. else
  442. i = trailing_strtol(name);
  443. #endif
  444. if (i != -1) {
  445. if (i == 0)
  446. strcpy(mac, "ethaddr");
  447. else
  448. sprintf(mac, "eth%daddr", i);
  449. } else {
  450. continue;
  451. }
  452. #ifdef FDT_SEQ_MACADDR_FROM_ENV
  453. nodeoff = fdt_path_offset(fdt, path);
  454. fdt_prop = fdt_get_property(fdt, nodeoff, "status",
  455. NULL);
  456. if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
  457. continue;
  458. i++;
  459. #endif
  460. tmp = env_get(mac);
  461. if (!tmp)
  462. continue;
  463. for (j = 0; j < 6; j++) {
  464. mac_addr[j] = tmp ?
  465. simple_strtoul(tmp, &end, 16) : 0;
  466. if (tmp)
  467. tmp = (*end) ? end + 1 : end;
  468. }
  469. do_fixup_by_path(fdt, path, "mac-address",
  470. &mac_addr, 6, 0);
  471. do_fixup_by_path(fdt, path, "local-mac-address",
  472. &mac_addr, 6, 1);
  473. }
  474. }
  475. }
  476. int fdt_record_loadable(void *blob, u32 index, const char *name,
  477. uintptr_t load_addr, u32 size, uintptr_t entry_point,
  478. const char *type, const char *os)
  479. {
  480. int err, node;
  481. err = fdt_check_header(blob);
  482. if (err < 0) {
  483. printf("%s: %s\n", __func__, fdt_strerror(err));
  484. return err;
  485. }
  486. /* find or create "/fit-images" node */
  487. node = fdt_find_or_add_subnode(blob, 0, "fit-images");
  488. if (node < 0)
  489. return node;
  490. /* find or create "/fit-images/<name>" node */
  491. node = fdt_find_or_add_subnode(blob, node, name);
  492. if (node < 0)
  493. return node;
  494. /*
  495. * We record these as 32bit entities, possibly truncating addresses.
  496. * However, spl_fit.c is not 64bit safe either: i.e. we should not
  497. * have an issue here.
  498. */
  499. fdt_setprop_u32(blob, node, "load-addr", load_addr);
  500. if (entry_point != -1)
  501. fdt_setprop_u32(blob, node, "entry-point", entry_point);
  502. fdt_setprop_u32(blob, node, "size", size);
  503. if (type)
  504. fdt_setprop_string(blob, node, "type", type);
  505. if (os)
  506. fdt_setprop_string(blob, node, "os", os);
  507. return node;
  508. }
  509. /* Resize the fdt to its actual size + a bit of padding */
  510. int fdt_shrink_to_minimum(void *blob, uint extrasize)
  511. {
  512. int i;
  513. uint64_t addr, size;
  514. int total, ret;
  515. uint actualsize;
  516. if (!blob)
  517. return 0;
  518. total = fdt_num_mem_rsv(blob);
  519. for (i = 0; i < total; i++) {
  520. fdt_get_mem_rsv(blob, i, &addr, &size);
  521. if (addr == (uintptr_t)blob) {
  522. fdt_del_mem_rsv(blob, i);
  523. break;
  524. }
  525. }
  526. /*
  527. * Calculate the actual size of the fdt
  528. * plus the size needed for 5 fdt_add_mem_rsv, one
  529. * for the fdt itself and 4 for a possible initrd
  530. * ((initrd-start + initrd-end) * 2 (name & value))
  531. */
  532. actualsize = fdt_off_dt_strings(blob) +
  533. fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
  534. actualsize += extrasize;
  535. /* Make it so the fdt ends on a page boundary */
  536. actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
  537. actualsize = actualsize - ((uintptr_t)blob & 0xfff);
  538. /* Change the fdt header to reflect the correct size */
  539. fdt_set_totalsize(blob, actualsize);
  540. /* Add the new reservation */
  541. ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
  542. if (ret < 0)
  543. return ret;
  544. return actualsize;
  545. }
  546. #ifdef CONFIG_PCI
  547. #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
  548. #define FDT_PCI_PREFETCH (0x40000000)
  549. #define FDT_PCI_MEM32 (0x02000000)
  550. #define FDT_PCI_IO (0x01000000)
  551. #define FDT_PCI_MEM64 (0x03000000)
  552. int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
  553. int addrcell, sizecell, len, r;
  554. u32 *dma_range;
  555. /* sized based on pci addr cells, size-cells, & address-cells */
  556. u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
  557. addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
  558. sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
  559. dma_range = &dma_ranges[0];
  560. for (r = 0; r < hose->region_count; r++) {
  561. u64 bus_start, phys_start, size;
  562. /* skip if !PCI_REGION_SYS_MEMORY */
  563. if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
  564. continue;
  565. bus_start = (u64)hose->regions[r].bus_start;
  566. phys_start = (u64)hose->regions[r].phys_start;
  567. size = (u64)hose->regions[r].size;
  568. dma_range[0] = 0;
  569. if (size >= 0x100000000ull)
  570. dma_range[0] |= FDT_PCI_MEM64;
  571. else
  572. dma_range[0] |= FDT_PCI_MEM32;
  573. if (hose->regions[r].flags & PCI_REGION_PREFETCH)
  574. dma_range[0] |= FDT_PCI_PREFETCH;
  575. #ifdef CONFIG_SYS_PCI_64BIT
  576. dma_range[1] = bus_start >> 32;
  577. #else
  578. dma_range[1] = 0;
  579. #endif
  580. dma_range[2] = bus_start & 0xffffffff;
  581. if (addrcell == 2) {
  582. dma_range[3] = phys_start >> 32;
  583. dma_range[4] = phys_start & 0xffffffff;
  584. } else {
  585. dma_range[3] = phys_start & 0xffffffff;
  586. }
  587. if (sizecell == 2) {
  588. dma_range[3 + addrcell + 0] = size >> 32;
  589. dma_range[3 + addrcell + 1] = size & 0xffffffff;
  590. } else {
  591. dma_range[3 + addrcell + 0] = size & 0xffffffff;
  592. }
  593. dma_range += (3 + addrcell + sizecell);
  594. }
  595. len = dma_range - &dma_ranges[0];
  596. if (len)
  597. fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
  598. return 0;
  599. }
  600. #endif
  601. int fdt_increase_size(void *fdt, int add_len)
  602. {
  603. int newlen;
  604. newlen = fdt_totalsize(fdt) + add_len;
  605. /* Open in place with a new len */
  606. return fdt_open_into(fdt, fdt, newlen);
  607. }
  608. #ifdef CONFIG_FDT_FIXUP_PARTITIONS
  609. #include <jffs2/load_kernel.h>
  610. #include <mtd_node.h>
  611. struct reg_cell {
  612. unsigned int r0;
  613. unsigned int r1;
  614. };
  615. static int fdt_del_subnodes(const void *blob, int parent_offset)
  616. {
  617. int off, ndepth;
  618. int ret;
  619. for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
  620. (off >= 0) && (ndepth > 0);
  621. off = fdt_next_node(blob, off, &ndepth)) {
  622. if (ndepth == 1) {
  623. debug("delete %s: offset: %x\n",
  624. fdt_get_name(blob, off, 0), off);
  625. ret = fdt_del_node((void *)blob, off);
  626. if (ret < 0) {
  627. printf("Can't delete node: %s\n",
  628. fdt_strerror(ret));
  629. return ret;
  630. } else {
  631. ndepth = 0;
  632. off = parent_offset;
  633. }
  634. }
  635. }
  636. return 0;
  637. }
  638. static int fdt_del_partitions(void *blob, int parent_offset)
  639. {
  640. const void *prop;
  641. int ndepth = 0;
  642. int off;
  643. int ret;
  644. off = fdt_next_node(blob, parent_offset, &ndepth);
  645. if (off > 0 && ndepth == 1) {
  646. prop = fdt_getprop(blob, off, "label", NULL);
  647. if (prop == NULL) {
  648. /*
  649. * Could not find label property, nand {}; node?
  650. * Check subnode, delete partitions there if any.
  651. */
  652. return fdt_del_partitions(blob, off);
  653. } else {
  654. ret = fdt_del_subnodes(blob, parent_offset);
  655. if (ret < 0) {
  656. printf("Can't remove subnodes: %s\n",
  657. fdt_strerror(ret));
  658. return ret;
  659. }
  660. }
  661. }
  662. return 0;
  663. }
  664. int fdt_node_set_part_info(void *blob, int parent_offset,
  665. struct mtd_device *dev)
  666. {
  667. struct list_head *pentry;
  668. struct part_info *part;
  669. struct reg_cell cell;
  670. int off, ndepth = 0;
  671. int part_num, ret;
  672. char buf[64];
  673. ret = fdt_del_partitions(blob, parent_offset);
  674. if (ret < 0)
  675. return ret;
  676. /*
  677. * Check if it is nand {}; subnode, adjust
  678. * the offset in this case
  679. */
  680. off = fdt_next_node(blob, parent_offset, &ndepth);
  681. if (off > 0 && ndepth == 1)
  682. parent_offset = off;
  683. part_num = 0;
  684. list_for_each_prev(pentry, &dev->parts) {
  685. int newoff;
  686. part = list_entry(pentry, struct part_info, link);
  687. debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
  688. part_num, part->name, part->size,
  689. part->offset, part->mask_flags);
  690. sprintf(buf, "partition@%llx", part->offset);
  691. add_sub:
  692. ret = fdt_add_subnode(blob, parent_offset, buf);
  693. if (ret == -FDT_ERR_NOSPACE) {
  694. ret = fdt_increase_size(blob, 512);
  695. if (!ret)
  696. goto add_sub;
  697. else
  698. goto err_size;
  699. } else if (ret < 0) {
  700. printf("Can't add partition node: %s\n",
  701. fdt_strerror(ret));
  702. return ret;
  703. }
  704. newoff = ret;
  705. /* Check MTD_WRITEABLE_CMD flag */
  706. if (part->mask_flags & 1) {
  707. add_ro:
  708. ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
  709. if (ret == -FDT_ERR_NOSPACE) {
  710. ret = fdt_increase_size(blob, 512);
  711. if (!ret)
  712. goto add_ro;
  713. else
  714. goto err_size;
  715. } else if (ret < 0)
  716. goto err_prop;
  717. }
  718. cell.r0 = cpu_to_fdt32(part->offset);
  719. cell.r1 = cpu_to_fdt32(part->size);
  720. add_reg:
  721. ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
  722. if (ret == -FDT_ERR_NOSPACE) {
  723. ret = fdt_increase_size(blob, 512);
  724. if (!ret)
  725. goto add_reg;
  726. else
  727. goto err_size;
  728. } else if (ret < 0)
  729. goto err_prop;
  730. add_label:
  731. ret = fdt_setprop_string(blob, newoff, "label", part->name);
  732. if (ret == -FDT_ERR_NOSPACE) {
  733. ret = fdt_increase_size(blob, 512);
  734. if (!ret)
  735. goto add_label;
  736. else
  737. goto err_size;
  738. } else if (ret < 0)
  739. goto err_prop;
  740. part_num++;
  741. }
  742. return 0;
  743. err_size:
  744. printf("Can't increase blob size: %s\n", fdt_strerror(ret));
  745. return ret;
  746. err_prop:
  747. printf("Can't add property: %s\n", fdt_strerror(ret));
  748. return ret;
  749. }
  750. /*
  751. * Update partitions in nor/nand nodes using info from
  752. * mtdparts environment variable. The nodes to update are
  753. * specified by node_info structure which contains mtd device
  754. * type and compatible string: E. g. the board code in
  755. * ft_board_setup() could use:
  756. *
  757. * struct node_info nodes[] = {
  758. * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
  759. * { "cfi-flash", MTD_DEV_TYPE_NOR, },
  760. * };
  761. *
  762. * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
  763. */
  764. void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info,
  765. int node_info_size)
  766. {
  767. struct mtd_device *dev;
  768. int i, idx;
  769. int noff;
  770. if (mtdparts_init() != 0)
  771. return;
  772. for (i = 0; i < node_info_size; i++) {
  773. idx = 0;
  774. noff = fdt_node_offset_by_compatible(blob, -1,
  775. node_info[i].compat);
  776. while (noff != -FDT_ERR_NOTFOUND) {
  777. debug("%s: %s, mtd dev type %d\n",
  778. fdt_get_name(blob, noff, 0),
  779. node_info[i].compat, node_info[i].type);
  780. dev = device_find(node_info[i].type, idx++);
  781. if (dev) {
  782. if (fdt_node_set_part_info(blob, noff, dev))
  783. return; /* return on error */
  784. }
  785. /* Jump to next flash node */
  786. noff = fdt_node_offset_by_compatible(blob, noff,
  787. node_info[i].compat);
  788. }
  789. }
  790. }
  791. #endif
  792. void fdt_del_node_and_alias(void *blob, const char *alias)
  793. {
  794. int off = fdt_path_offset(blob, alias);
  795. if (off < 0)
  796. return;
  797. fdt_del_node(blob, off);
  798. off = fdt_path_offset(blob, "/aliases");
  799. fdt_delprop(blob, off, alias);
  800. }
  801. /* Max address size we deal with */
  802. #define OF_MAX_ADDR_CELLS 4
  803. #define OF_BAD_ADDR FDT_ADDR_T_NONE
  804. #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
  805. (ns) > 0)
  806. /* Debug utility */
  807. #ifdef DEBUG
  808. static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
  809. {
  810. printf("%s", s);
  811. while(na--)
  812. printf(" %08x", *(addr++));
  813. printf("\n");
  814. }
  815. #else
  816. static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
  817. #endif
  818. /**
  819. * struct of_bus - Callbacks for bus specific translators
  820. * @name: A string used to identify this bus in debug output.
  821. * @addresses: The name of the DT property from which addresses are
  822. * to be read, typically "reg".
  823. * @match: Return non-zero if the node whose parent is at
  824. * parentoffset in the FDT blob corresponds to a bus
  825. * of this type, otherwise return zero. If NULL a match
  826. * is assumed.
  827. * @count_cells:Count how many cells (be32 values) a node whose parent
  828. * is at parentoffset in the FDT blob will require to
  829. * represent its address (written to *addrc) & size
  830. * (written to *sizec).
  831. * @map: Map the address addr from the address space of this
  832. * bus to that of its parent, making use of the ranges
  833. * read from DT to an array at range. na and ns are the
  834. * number of cells (be32 values) used to hold and address
  835. * or size, respectively, for this bus. pna is the number
  836. * of cells used to hold an address for the parent bus.
  837. * Returns the address in the address space of the parent
  838. * bus.
  839. * @translate: Update the value of the address cells at addr within an
  840. * FDT by adding offset to it. na specifies the number of
  841. * cells used to hold the address being translated. Returns
  842. * zero on success, non-zero on error.
  843. *
  844. * Each bus type will include a struct of_bus in the of_busses array,
  845. * providing implementations of some or all of the functions used to
  846. * match the bus & handle address translation for its children.
  847. */
  848. struct of_bus {
  849. const char *name;
  850. const char *addresses;
  851. int (*match)(const void *blob, int parentoffset);
  852. void (*count_cells)(const void *blob, int parentoffset,
  853. int *addrc, int *sizec);
  854. u64 (*map)(fdt32_t *addr, const fdt32_t *range,
  855. int na, int ns, int pna);
  856. int (*translate)(fdt32_t *addr, u64 offset, int na);
  857. };
  858. /* Default translator (generic bus) */
  859. void fdt_support_default_count_cells(const void *blob, int parentoffset,
  860. int *addrc, int *sizec)
  861. {
  862. const fdt32_t *prop;
  863. if (addrc)
  864. *addrc = fdt_address_cells(blob, parentoffset);
  865. if (sizec) {
  866. prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
  867. if (prop)
  868. *sizec = be32_to_cpup(prop);
  869. else
  870. *sizec = 1;
  871. }
  872. }
  873. static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
  874. int na, int ns, int pna)
  875. {
  876. u64 cp, s, da;
  877. cp = fdt_read_number(range, na);
  878. s = fdt_read_number(range + na + pna, ns);
  879. da = fdt_read_number(addr, na);
  880. debug("OF: default map, cp=%llu, s=%llu, da=%llu\n", cp, s, da);
  881. if (da < cp || da >= (cp + s))
  882. return OF_BAD_ADDR;
  883. return da - cp;
  884. }
  885. static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
  886. {
  887. u64 a = fdt_read_number(addr, na);
  888. memset(addr, 0, na * 4);
  889. a += offset;
  890. if (na > 1)
  891. addr[na - 2] = cpu_to_fdt32(a >> 32);
  892. addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
  893. return 0;
  894. }
  895. #ifdef CONFIG_OF_ISA_BUS
  896. /* ISA bus translator */
  897. static int of_bus_isa_match(const void *blob, int parentoffset)
  898. {
  899. const char *name;
  900. name = fdt_get_name(blob, parentoffset, NULL);
  901. if (!name)
  902. return 0;
  903. return !strcmp(name, "isa");
  904. }
  905. static void of_bus_isa_count_cells(const void *blob, int parentoffset,
  906. int *addrc, int *sizec)
  907. {
  908. if (addrc)
  909. *addrc = 2;
  910. if (sizec)
  911. *sizec = 1;
  912. }
  913. static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
  914. int na, int ns, int pna)
  915. {
  916. u64 cp, s, da;
  917. /* Check address type match */
  918. if ((addr[0] ^ range[0]) & cpu_to_be32(1))
  919. return OF_BAD_ADDR;
  920. cp = fdt_read_number(range + 1, na - 1);
  921. s = fdt_read_number(range + na + pna, ns);
  922. da = fdt_read_number(addr + 1, na - 1);
  923. debug("OF: ISA map, cp=%llu, s=%llu, da=%llu\n", cp, s, da);
  924. if (da < cp || da >= (cp + s))
  925. return OF_BAD_ADDR;
  926. return da - cp;
  927. }
  928. static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
  929. {
  930. return of_bus_default_translate(addr + 1, offset, na - 1);
  931. }
  932. #endif /* CONFIG_OF_ISA_BUS */
  933. /* Array of bus specific translators */
  934. static struct of_bus of_busses[] = {
  935. #ifdef CONFIG_OF_ISA_BUS
  936. /* ISA */
  937. {
  938. .name = "isa",
  939. .addresses = "reg",
  940. .match = of_bus_isa_match,
  941. .count_cells = of_bus_isa_count_cells,
  942. .map = of_bus_isa_map,
  943. .translate = of_bus_isa_translate,
  944. },
  945. #endif /* CONFIG_OF_ISA_BUS */
  946. /* Default */
  947. {
  948. .name = "default",
  949. .addresses = "reg",
  950. .count_cells = fdt_support_default_count_cells,
  951. .map = of_bus_default_map,
  952. .translate = of_bus_default_translate,
  953. },
  954. };
  955. static struct of_bus *of_match_bus(const void *blob, int parentoffset)
  956. {
  957. struct of_bus *bus;
  958. if (ARRAY_SIZE(of_busses) == 1)
  959. return of_busses;
  960. for (bus = of_busses; bus; bus++) {
  961. if (!bus->match || bus->match(blob, parentoffset))
  962. return bus;
  963. }
  964. /*
  965. * We should always have matched the default bus at least, since
  966. * it has a NULL match field. If we didn't then it somehow isn't
  967. * in the of_busses array or something equally catastrophic has
  968. * gone wrong.
  969. */
  970. assert(0);
  971. return NULL;
  972. }
  973. static int of_translate_one(const void *blob, int parent, struct of_bus *bus,
  974. struct of_bus *pbus, fdt32_t *addr,
  975. int na, int ns, int pna, const char *rprop)
  976. {
  977. const fdt32_t *ranges;
  978. int rlen;
  979. int rone;
  980. u64 offset = OF_BAD_ADDR;
  981. /* Normally, an absence of a "ranges" property means we are
  982. * crossing a non-translatable boundary, and thus the addresses
  983. * below the current not cannot be converted to CPU physical ones.
  984. * Unfortunately, while this is very clear in the spec, it's not
  985. * what Apple understood, and they do have things like /uni-n or
  986. * /ht nodes with no "ranges" property and a lot of perfectly
  987. * useable mapped devices below them. Thus we treat the absence of
  988. * "ranges" as equivalent to an empty "ranges" property which means
  989. * a 1:1 translation at that level. It's up to the caller not to try
  990. * to translate addresses that aren't supposed to be translated in
  991. * the first place. --BenH.
  992. */
  993. ranges = fdt_getprop(blob, parent, rprop, &rlen);
  994. if (ranges == NULL || rlen == 0) {
  995. offset = fdt_read_number(addr, na);
  996. memset(addr, 0, pna * 4);
  997. debug("OF: no ranges, 1:1 translation\n");
  998. goto finish;
  999. }
  1000. debug("OF: walking ranges...\n");
  1001. /* Now walk through the ranges */
  1002. rlen /= 4;
  1003. rone = na + pna + ns;
  1004. for (; rlen >= rone; rlen -= rone, ranges += rone) {
  1005. offset = bus->map(addr, ranges, na, ns, pna);
  1006. if (offset != OF_BAD_ADDR)
  1007. break;
  1008. }
  1009. if (offset == OF_BAD_ADDR) {
  1010. debug("OF: not found !\n");
  1011. return 1;
  1012. }
  1013. memcpy(addr, ranges + na, 4 * pna);
  1014. finish:
  1015. of_dump_addr("OF: parent translation for:", addr, pna);
  1016. debug("OF: with offset: %llu\n", offset);
  1017. /* Translate it into parent bus space */
  1018. return pbus->translate(addr, offset, pna);
  1019. }
  1020. /*
  1021. * Translate an address from the device-tree into a CPU physical address,
  1022. * this walks up the tree and applies the various bus mappings on the
  1023. * way.
  1024. *
  1025. * Note: We consider that crossing any level with #size-cells == 0 to mean
  1026. * that translation is impossible (that is we are not dealing with a value
  1027. * that can be mapped to a cpu physical address). This is not really specified
  1028. * that way, but this is traditionally the way IBM at least do things
  1029. */
  1030. static u64 __of_translate_address(const void *blob, int node_offset,
  1031. const fdt32_t *in_addr, const char *rprop)
  1032. {
  1033. int parent;
  1034. struct of_bus *bus, *pbus;
  1035. fdt32_t addr[OF_MAX_ADDR_CELLS];
  1036. int na, ns, pna, pns;
  1037. u64 result = OF_BAD_ADDR;
  1038. debug("OF: ** translation for device %s **\n",
  1039. fdt_get_name(blob, node_offset, NULL));
  1040. /* Get parent & match bus type */
  1041. parent = fdt_parent_offset(blob, node_offset);
  1042. if (parent < 0)
  1043. goto bail;
  1044. bus = of_match_bus(blob, parent);
  1045. /* Cound address cells & copy address locally */
  1046. bus->count_cells(blob, parent, &na, &ns);
  1047. if (!OF_CHECK_COUNTS(na, ns)) {
  1048. printf("%s: Bad cell count for %s\n", __FUNCTION__,
  1049. fdt_get_name(blob, node_offset, NULL));
  1050. goto bail;
  1051. }
  1052. memcpy(addr, in_addr, na * 4);
  1053. debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
  1054. bus->name, na, ns, fdt_get_name(blob, parent, NULL));
  1055. of_dump_addr("OF: translating address:", addr, na);
  1056. /* Translate */
  1057. for (;;) {
  1058. /* Switch to parent bus */
  1059. node_offset = parent;
  1060. parent = fdt_parent_offset(blob, node_offset);
  1061. /* If root, we have finished */
  1062. if (parent < 0) {
  1063. debug("OF: reached root node\n");
  1064. result = fdt_read_number(addr, na);
  1065. break;
  1066. }
  1067. /* Get new parent bus and counts */
  1068. pbus = of_match_bus(blob, parent);
  1069. pbus->count_cells(blob, parent, &pna, &pns);
  1070. if (!OF_CHECK_COUNTS(pna, pns)) {
  1071. printf("%s: Bad cell count for %s\n", __FUNCTION__,
  1072. fdt_get_name(blob, node_offset, NULL));
  1073. break;
  1074. }
  1075. debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
  1076. pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
  1077. /* Apply bus translation */
  1078. if (of_translate_one(blob, node_offset, bus, pbus,
  1079. addr, na, ns, pna, rprop))
  1080. break;
  1081. /* Complete the move up one level */
  1082. na = pna;
  1083. ns = pns;
  1084. bus = pbus;
  1085. of_dump_addr("OF: one level translation:", addr, na);
  1086. }
  1087. bail:
  1088. return result;
  1089. }
  1090. u64 fdt_translate_address(const void *blob, int node_offset,
  1091. const fdt32_t *in_addr)
  1092. {
  1093. return __of_translate_address(blob, node_offset, in_addr, "ranges");
  1094. }
  1095. /**
  1096. * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
  1097. * who's reg property matches a physical cpu address
  1098. *
  1099. * @blob: ptr to device tree
  1100. * @compat: compatiable string to match
  1101. * @compat_off: property name
  1102. *
  1103. */
  1104. int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
  1105. phys_addr_t compat_off)
  1106. {
  1107. int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
  1108. while (off != -FDT_ERR_NOTFOUND) {
  1109. const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
  1110. if (reg) {
  1111. if (compat_off == fdt_translate_address(blob, off, reg))
  1112. return off;
  1113. }
  1114. off = fdt_node_offset_by_compatible(blob, off, compat);
  1115. }
  1116. return -FDT_ERR_NOTFOUND;
  1117. }
  1118. /**
  1119. * fdt_alloc_phandle: Return next free phandle value
  1120. *
  1121. * @blob: ptr to device tree
  1122. */
  1123. int fdt_alloc_phandle(void *blob)
  1124. {
  1125. int offset;
  1126. uint32_t phandle = 0;
  1127. for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
  1128. offset = fdt_next_node(blob, offset, NULL)) {
  1129. phandle = max(phandle, fdt_get_phandle(blob, offset));
  1130. }
  1131. return phandle + 1;
  1132. }
  1133. /*
  1134. * fdt_set_phandle: Create a phandle property for the given node
  1135. *
  1136. * @fdt: ptr to device tree
  1137. * @nodeoffset: node to update
  1138. * @phandle: phandle value to set (must be unique)
  1139. */
  1140. int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
  1141. {
  1142. int ret;
  1143. #ifdef DEBUG
  1144. int off = fdt_node_offset_by_phandle(fdt, phandle);
  1145. if ((off >= 0) && (off != nodeoffset)) {
  1146. char buf[64];
  1147. fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
  1148. printf("Trying to update node %s with phandle %u ",
  1149. buf, phandle);
  1150. fdt_get_path(fdt, off, buf, sizeof(buf));
  1151. printf("that already exists in node %s.\n", buf);
  1152. return -FDT_ERR_BADPHANDLE;
  1153. }
  1154. #endif
  1155. ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
  1156. if (ret < 0)
  1157. return ret;
  1158. /*
  1159. * For now, also set the deprecated "linux,phandle" property, so that we
  1160. * don't break older kernels.
  1161. */
  1162. ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
  1163. return ret;
  1164. }
  1165. /*
  1166. * fdt_create_phandle: Create a phandle property for the given node
  1167. *
  1168. * @fdt: ptr to device tree
  1169. * @nodeoffset: node to update
  1170. */
  1171. unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
  1172. {
  1173. /* see if there is a phandle already */
  1174. int phandle = fdt_get_phandle(fdt, nodeoffset);
  1175. /* if we got 0, means no phandle so create one */
  1176. if (phandle == 0) {
  1177. int ret;
  1178. phandle = fdt_alloc_phandle(fdt);
  1179. ret = fdt_set_phandle(fdt, nodeoffset, phandle);
  1180. if (ret < 0) {
  1181. printf("Can't set phandle %u: %s\n", phandle,
  1182. fdt_strerror(ret));
  1183. return 0;
  1184. }
  1185. }
  1186. return phandle;
  1187. }
  1188. /*
  1189. * fdt_set_node_status: Set status for the given node
  1190. *
  1191. * @fdt: ptr to device tree
  1192. * @nodeoffset: node to update
  1193. * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
  1194. * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
  1195. * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
  1196. */
  1197. int fdt_set_node_status(void *fdt, int nodeoffset,
  1198. enum fdt_status status, unsigned int error_code)
  1199. {
  1200. char buf[16];
  1201. int ret = 0;
  1202. if (nodeoffset < 0)
  1203. return nodeoffset;
  1204. switch (status) {
  1205. case FDT_STATUS_OKAY:
  1206. ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
  1207. break;
  1208. case FDT_STATUS_DISABLED:
  1209. ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
  1210. break;
  1211. case FDT_STATUS_FAIL:
  1212. ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
  1213. break;
  1214. case FDT_STATUS_FAIL_ERROR_CODE:
  1215. sprintf(buf, "fail-%d", error_code);
  1216. ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
  1217. break;
  1218. default:
  1219. printf("Invalid fdt status: %x\n", status);
  1220. ret = -1;
  1221. break;
  1222. }
  1223. return ret;
  1224. }
  1225. /*
  1226. * fdt_set_status_by_alias: Set status for the given node given an alias
  1227. *
  1228. * @fdt: ptr to device tree
  1229. * @alias: alias of node to update
  1230. * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
  1231. * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
  1232. * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
  1233. */
  1234. int fdt_set_status_by_alias(void *fdt, const char* alias,
  1235. enum fdt_status status, unsigned int error_code)
  1236. {
  1237. int offset = fdt_path_offset(fdt, alias);
  1238. return fdt_set_node_status(fdt, offset, status, error_code);
  1239. }
  1240. #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
  1241. int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
  1242. {
  1243. int noff;
  1244. int ret;
  1245. noff = fdt_node_offset_by_compatible(blob, -1, compat);
  1246. if (noff != -FDT_ERR_NOTFOUND) {
  1247. debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
  1248. add_edid:
  1249. ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
  1250. if (ret == -FDT_ERR_NOSPACE) {
  1251. ret = fdt_increase_size(blob, 512);
  1252. if (!ret)
  1253. goto add_edid;
  1254. else
  1255. goto err_size;
  1256. } else if (ret < 0) {
  1257. printf("Can't add property: %s\n", fdt_strerror(ret));
  1258. return ret;
  1259. }
  1260. }
  1261. return 0;
  1262. err_size:
  1263. printf("Can't increase blob size: %s\n", fdt_strerror(ret));
  1264. return ret;
  1265. }
  1266. #endif
  1267. /*
  1268. * Verify the physical address of device tree node for a given alias
  1269. *
  1270. * This function locates the device tree node of a given alias, and then
  1271. * verifies that the physical address of that device matches the given
  1272. * parameter. It displays a message if there is a mismatch.
  1273. *
  1274. * Returns 1 on success, 0 on failure
  1275. */
  1276. int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
  1277. {
  1278. const char *path;
  1279. const fdt32_t *reg;
  1280. int node, len;
  1281. u64 dt_addr;
  1282. path = fdt_getprop(fdt, anode, alias, NULL);
  1283. if (!path) {
  1284. /* If there's no such alias, then it's not a failure */
  1285. return 1;
  1286. }
  1287. node = fdt_path_offset(fdt, path);
  1288. if (node < 0) {
  1289. printf("Warning: device tree alias '%s' points to invalid "
  1290. "node %s.\n", alias, path);
  1291. return 0;
  1292. }
  1293. reg = fdt_getprop(fdt, node, "reg", &len);
  1294. if (!reg) {
  1295. printf("Warning: device tree node '%s' has no address.\n",
  1296. path);
  1297. return 0;
  1298. }
  1299. dt_addr = fdt_translate_address(fdt, node, reg);
  1300. if (addr != dt_addr) {
  1301. printf("Warning: U-Boot configured device %s at address %llu,\n"
  1302. "but the device tree has it address %llx.\n",
  1303. alias, addr, dt_addr);
  1304. return 0;
  1305. }
  1306. return 1;
  1307. }
  1308. /*
  1309. * Returns the base address of an SOC or PCI node
  1310. */
  1311. u64 fdt_get_base_address(const void *fdt, int node)
  1312. {
  1313. int size;
  1314. const fdt32_t *prop;
  1315. prop = fdt_getprop(fdt, node, "reg", &size);
  1316. return prop ? fdt_translate_address(fdt, node, prop) : 0;
  1317. }
  1318. /*
  1319. * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
  1320. */
  1321. static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
  1322. uint64_t *val, int cells)
  1323. {
  1324. const fdt32_t *prop32 = &prop[cell_off];
  1325. const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
  1326. if ((cell_off + cells) > prop_len)
  1327. return -FDT_ERR_NOSPACE;
  1328. switch (cells) {
  1329. case 1:
  1330. *val = fdt32_to_cpu(*prop32);
  1331. break;
  1332. case 2:
  1333. *val = fdt64_to_cpu(*prop64);
  1334. break;
  1335. default:
  1336. return -FDT_ERR_NOSPACE;
  1337. }
  1338. return 0;
  1339. }
  1340. /**
  1341. * fdt_read_range - Read a node's n'th range property
  1342. *
  1343. * @fdt: ptr to device tree
  1344. * @node: offset of node
  1345. * @n: range index
  1346. * @child_addr: pointer to storage for the "child address" field
  1347. * @addr: pointer to storage for the CPU view translated physical start
  1348. * @len: pointer to storage for the range length
  1349. *
  1350. * Convenience function that reads and interprets a specific range out of
  1351. * a number of the "ranges" property array.
  1352. */
  1353. int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
  1354. uint64_t *addr, uint64_t *len)
  1355. {
  1356. int pnode = fdt_parent_offset(fdt, node);
  1357. const fdt32_t *ranges;
  1358. int pacells;
  1359. int acells;
  1360. int scells;
  1361. int ranges_len;
  1362. int cell = 0;
  1363. int r = 0;
  1364. /*
  1365. * The "ranges" property is an array of
  1366. * { <child address> <parent address> <size in child address space> }
  1367. *
  1368. * All 3 elements can span a diffent number of cells. Fetch their size.
  1369. */
  1370. pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
  1371. acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
  1372. scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
  1373. /* Now try to get the ranges property */
  1374. ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
  1375. if (!ranges)
  1376. return -FDT_ERR_NOTFOUND;
  1377. ranges_len /= sizeof(uint32_t);
  1378. /* Jump to the n'th entry */
  1379. cell = n * (pacells + acells + scells);
  1380. /* Read <child address> */
  1381. if (child_addr) {
  1382. r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
  1383. acells);
  1384. if (r)
  1385. return r;
  1386. }
  1387. cell += acells;
  1388. /* Read <parent address> */
  1389. if (addr)
  1390. *addr = fdt_translate_address(fdt, node, ranges + cell);
  1391. cell += pacells;
  1392. /* Read <size in child address space> */
  1393. if (len) {
  1394. r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
  1395. if (r)
  1396. return r;
  1397. }
  1398. return 0;
  1399. }
  1400. /**
  1401. * fdt_setup_simplefb_node - Fill and enable a simplefb node
  1402. *
  1403. * @fdt: ptr to device tree
  1404. * @node: offset of the simplefb node
  1405. * @base_address: framebuffer base address
  1406. * @width: width in pixels
  1407. * @height: height in pixels
  1408. * @stride: bytes per line
  1409. * @format: pixel format string
  1410. *
  1411. * Convenience function to fill and enable a simplefb node.
  1412. */
  1413. int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
  1414. u32 height, u32 stride, const char *format)
  1415. {
  1416. char name[32];
  1417. fdt32_t cells[4];
  1418. int i, addrc, sizec, ret;
  1419. fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node),
  1420. &addrc, &sizec);
  1421. i = 0;
  1422. if (addrc == 2)
  1423. cells[i++] = cpu_to_fdt32(base_address >> 32);
  1424. cells[i++] = cpu_to_fdt32(base_address);
  1425. if (sizec == 2)
  1426. cells[i++] = 0;
  1427. cells[i++] = cpu_to_fdt32(height * stride);
  1428. ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
  1429. if (ret < 0)
  1430. return ret;
  1431. snprintf(name, sizeof(name), "framebuffer@%llx", base_address);
  1432. ret = fdt_set_name(fdt, node, name);
  1433. if (ret < 0)
  1434. return ret;
  1435. ret = fdt_setprop_u32(fdt, node, "width", width);
  1436. if (ret < 0)
  1437. return ret;
  1438. ret = fdt_setprop_u32(fdt, node, "height", height);
  1439. if (ret < 0)
  1440. return ret;
  1441. ret = fdt_setprop_u32(fdt, node, "stride", stride);
  1442. if (ret < 0)
  1443. return ret;
  1444. ret = fdt_setprop_string(fdt, node, "format", format);
  1445. if (ret < 0)
  1446. return ret;
  1447. ret = fdt_setprop_string(fdt, node, "status", "okay");
  1448. if (ret < 0)
  1449. return ret;
  1450. return 0;
  1451. }
  1452. /*
  1453. * Update native-mode in display-timings from display environment variable.
  1454. * The node to update are specified by path.
  1455. */
  1456. int fdt_fixup_display(void *blob, const char *path, const char *display)
  1457. {
  1458. int off, toff;
  1459. if (!display || !path)
  1460. return -FDT_ERR_NOTFOUND;
  1461. toff = fdt_path_offset(blob, path);
  1462. if (toff >= 0)
  1463. toff = fdt_subnode_offset(blob, toff, "display-timings");
  1464. if (toff < 0)
  1465. return toff;
  1466. for (off = fdt_first_subnode(blob, toff);
  1467. off >= 0;
  1468. off = fdt_next_subnode(blob, off)) {
  1469. uint32_t h = fdt_get_phandle(blob, off);
  1470. debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
  1471. fdt32_to_cpu(h));
  1472. if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
  1473. return fdt_setprop_u32(blob, toff, "native-mode", h);
  1474. }
  1475. return toff;
  1476. }
  1477. #ifdef CONFIG_OF_LIBFDT_OVERLAY
  1478. /**
  1479. * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
  1480. *
  1481. * @fdt: ptr to device tree
  1482. * @fdto: ptr to device tree overlay
  1483. *
  1484. * Convenience function to apply an overlay and display helpful messages
  1485. * in the case of an error
  1486. */
  1487. int fdt_overlay_apply_verbose(void *fdt, void *fdto)
  1488. {
  1489. int err;
  1490. bool has_symbols;
  1491. err = fdt_path_offset(fdt, "/__symbols__");
  1492. has_symbols = err >= 0;
  1493. err = fdt_overlay_apply(fdt, fdto);
  1494. if (err < 0) {
  1495. printf("failed on fdt_overlay_apply(): %s\n",
  1496. fdt_strerror(err));
  1497. if (!has_symbols) {
  1498. printf("base fdt does did not have a /__symbols__ node\n");
  1499. printf("make sure you've compiled with -@\n");
  1500. }
  1501. }
  1502. return err;
  1503. }
  1504. #endif