xref: /openbmc/u-boot/common/image-fdt.c (revision 0edd82e2)
1 /*
2  * Copyright (c) 2013, Google Inc.
3  *
4  * (C) Copyright 2008 Semihalf
5  *
6  * (C) Copyright 2000-2006
7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
8  *
9  * SPDX-License-Identifier:	GPL-2.0+
10  */
11 
12 #include <common.h>
13 #include <fdt_support.h>
14 #include <errno.h>
15 #include <image.h>
16 #include <libfdt.h>
17 #include <mapmem.h>
18 #include <asm/io.h>
19 
20 #ifndef CONFIG_SYS_FDT_PAD
21 #define CONFIG_SYS_FDT_PAD 0x3000
22 #endif
23 
24 DECLARE_GLOBAL_DATA_PTR;
25 
26 static void fdt_error(const char *msg)
27 {
28 	puts("ERROR: ");
29 	puts(msg);
30 	puts(" - must RESET the board to recover.\n");
31 }
32 
33 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
34 static const image_header_t *image_get_fdt(ulong fdt_addr)
35 {
36 	const image_header_t *fdt_hdr = map_sysmem(fdt_addr, 0);
37 
38 	image_print_contents(fdt_hdr);
39 
40 	puts("   Verifying Checksum ... ");
41 	if (!image_check_hcrc(fdt_hdr)) {
42 		fdt_error("fdt header checksum invalid");
43 		return NULL;
44 	}
45 
46 	if (!image_check_dcrc(fdt_hdr)) {
47 		fdt_error("fdt checksum invalid");
48 		return NULL;
49 	}
50 	puts("OK\n");
51 
52 	if (!image_check_type(fdt_hdr, IH_TYPE_FLATDT)) {
53 		fdt_error("uImage is not a fdt");
54 		return NULL;
55 	}
56 	if (image_get_comp(fdt_hdr) != IH_COMP_NONE) {
57 		fdt_error("uImage is compressed");
58 		return NULL;
59 	}
60 	if (fdt_check_header((void *)image_get_data(fdt_hdr)) != 0) {
61 		fdt_error("uImage data is not a fdt");
62 		return NULL;
63 	}
64 	return fdt_hdr;
65 }
66 #endif
67 
68 /**
69  * boot_fdt_add_mem_rsv_regions - Mark the memreserve sections as unusable
70  * @lmb: pointer to lmb handle, will be used for memory mgmt
71  * @fdt_blob: pointer to fdt blob base address
72  *
73  * Adds the memreserve regions in the dtb to the lmb block.  Adding the
74  * memreserve regions prevents u-boot from using them to store the initrd
75  * or the fdt blob.
76  */
77 void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob)
78 {
79 	uint64_t addr, size;
80 	int i, total;
81 
82 	if (fdt_check_header(fdt_blob) != 0)
83 		return;
84 
85 	total = fdt_num_mem_rsv(fdt_blob);
86 	for (i = 0; i < total; i++) {
87 		if (fdt_get_mem_rsv(fdt_blob, i, &addr, &size) != 0)
88 			continue;
89 		printf("   reserving fdt memory region: addr=%llx size=%llx\n",
90 		       (unsigned long long)addr, (unsigned long long)size);
91 		lmb_reserve(lmb, addr, size);
92 	}
93 }
94 
95 /**
96  * boot_relocate_fdt - relocate flat device tree
97  * @lmb: pointer to lmb handle, will be used for memory mgmt
98  * @of_flat_tree: pointer to a char* variable, will hold fdt start address
99  * @of_size: pointer to a ulong variable, will hold fdt length
100  *
101  * boot_relocate_fdt() allocates a region of memory within the bootmap and
102  * relocates the of_flat_tree into that region, even if the fdt is already in
103  * the bootmap.  It also expands the size of the fdt by CONFIG_SYS_FDT_PAD
104  * bytes.
105  *
106  * of_flat_tree and of_size are set to final (after relocation) values
107  *
108  * returns:
109  *      0 - success
110  *      1 - failure
111  */
112 int boot_relocate_fdt(struct lmb *lmb, char **of_flat_tree, ulong *of_size)
113 {
114 	void	*fdt_blob = *of_flat_tree;
115 	void	*of_start = NULL;
116 	char	*fdt_high;
117 	ulong	of_len = 0;
118 	int	err;
119 	int	disable_relocation = 0;
120 
121 	/* nothing to do */
122 	if (*of_size == 0)
123 		return 0;
124 
125 	if (fdt_check_header(fdt_blob) != 0) {
126 		fdt_error("image is not a fdt");
127 		goto error;
128 	}
129 
130 	/* position on a 4K boundary before the alloc_current */
131 	/* Pad the FDT by a specified amount */
132 	of_len = *of_size + CONFIG_SYS_FDT_PAD;
133 
134 	/* If fdt_high is set use it to select the relocation address */
135 	fdt_high = getenv("fdt_high");
136 	if (fdt_high) {
137 		void *desired_addr = (void *)simple_strtoul(fdt_high, NULL, 16);
138 
139 		if (((ulong) desired_addr) == ~0UL) {
140 			/* All ones means use fdt in place */
141 			of_start = fdt_blob;
142 			lmb_reserve(lmb, (ulong)of_start, of_len);
143 			disable_relocation = 1;
144 		} else if (desired_addr) {
145 			of_start =
146 			    (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000,
147 							   (ulong)desired_addr);
148 			if (of_start == NULL) {
149 				puts("Failed using fdt_high value for Device Tree");
150 				goto error;
151 			}
152 		} else {
153 			of_start =
154 			    (void *)(ulong) lmb_alloc(lmb, of_len, 0x1000);
155 		}
156 	} else {
157 		of_start =
158 		    (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000,
159 						   getenv_bootm_mapsize()
160 						   + getenv_bootm_low());
161 	}
162 
163 	if (of_start == NULL) {
164 		puts("device tree - allocation error\n");
165 		goto error;
166 	}
167 
168 	if (disable_relocation) {
169 		/*
170 		 * We assume there is space after the existing fdt to use
171 		 * for padding
172 		 */
173 		fdt_set_totalsize(of_start, of_len);
174 		printf("   Using Device Tree in place at %p, end %p\n",
175 		       of_start, of_start + of_len - 1);
176 	} else {
177 		debug("## device tree at %p ... %p (len=%ld [0x%lX])\n",
178 		      fdt_blob, fdt_blob + *of_size - 1, of_len, of_len);
179 
180 		printf("   Loading Device Tree to %p, end %p ... ",
181 		       of_start, of_start + of_len - 1);
182 
183 		err = fdt_open_into(fdt_blob, of_start, of_len);
184 		if (err != 0) {
185 			fdt_error("fdt move failed");
186 			goto error;
187 		}
188 		puts("OK\n");
189 	}
190 
191 	*of_flat_tree = of_start;
192 	*of_size = of_len;
193 
194 	set_working_fdt_addr((ulong)*of_flat_tree);
195 	return 0;
196 
197 error:
198 	return 1;
199 }
200 
201 /**
202  * boot_get_fdt - main fdt handling routine
203  * @argc: command argument count
204  * @argv: command argument list
205  * @arch: architecture (IH_ARCH_...)
206  * @images: pointer to the bootm images structure
207  * @of_flat_tree: pointer to a char* variable, will hold fdt start address
208  * @of_size: pointer to a ulong variable, will hold fdt length
209  *
210  * boot_get_fdt() is responsible for finding a valid flat device tree image.
211  * Curently supported are the following ramdisk sources:
212  *      - multicomponent kernel/ramdisk image,
213  *      - commandline provided address of decicated ramdisk image.
214  *
215  * returns:
216  *     0, if fdt image was found and valid, or skipped
217  *     of_flat_tree and of_size are set to fdt start address and length if
218  *     fdt image is found and valid
219  *
220  *     1, if fdt image is found but corrupted
221  *     of_flat_tree and of_size are set to 0 if no fdt exists
222  */
223 int boot_get_fdt(int flag, int argc, char * const argv[], uint8_t arch,
224 		bootm_headers_t *images, char **of_flat_tree, ulong *of_size)
225 {
226 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
227 	const image_header_t *fdt_hdr;
228 	ulong		load, load_end;
229 	ulong		image_start, image_data, image_end;
230 #endif
231 	ulong		fdt_addr;
232 	char		*fdt_blob = NULL;
233 	void		*buf;
234 #if defined(CONFIG_FIT)
235 	const char	*fit_uname_config = images->fit_uname_cfg;
236 	const char	*fit_uname_fdt = NULL;
237 	ulong		default_addr;
238 	int		fdt_noffset;
239 #endif
240 	const char *select = NULL;
241 	int		ok_no_fdt = 0;
242 
243 	*of_flat_tree = NULL;
244 	*of_size = 0;
245 
246 	if (argc > 2)
247 		select = argv[2];
248 	if (select || genimg_has_config(images)) {
249 #if defined(CONFIG_FIT)
250 		if (select) {
251 			/*
252 			 * If the FDT blob comes from the FIT image and the
253 			 * FIT image address is omitted in the command line
254 			 * argument, try to use ramdisk or os FIT image
255 			 * address or default load address.
256 			 */
257 			if (images->fit_uname_rd)
258 				default_addr = (ulong)images->fit_hdr_rd;
259 			else if (images->fit_uname_os)
260 				default_addr = (ulong)images->fit_hdr_os;
261 			else
262 				default_addr = load_addr;
263 
264 			if (fit_parse_conf(select, default_addr,
265 					   &fdt_addr, &fit_uname_config)) {
266 				debug("*  fdt: config '%s' from image at 0x%08lx\n",
267 				      fit_uname_config, fdt_addr);
268 			} else if (fit_parse_subimage(select, default_addr,
269 				   &fdt_addr, &fit_uname_fdt)) {
270 				debug("*  fdt: subimage '%s' from image at 0x%08lx\n",
271 				      fit_uname_fdt, fdt_addr);
272 			} else
273 #endif
274 			{
275 				fdt_addr = simple_strtoul(select, NULL, 16);
276 				debug("*  fdt: cmdline image address = 0x%08lx\n",
277 				      fdt_addr);
278 			}
279 #if defined(CONFIG_FIT)
280 		} else {
281 			/* use FIT configuration provided in first bootm
282 			 * command argument
283 			 */
284 			fdt_addr = map_to_sysmem(images->fit_hdr_os);
285 			fdt_noffset = fit_get_node_from_config(images,
286 							       FIT_FDT_PROP,
287 							       fdt_addr);
288 			if (fdt_noffset == -ENOLINK)
289 				return 0;
290 			else if (fdt_noffset < 0)
291 				return 1;
292 		}
293 #endif
294 		debug("## Checking for 'FDT'/'FDT Image' at %08lx\n",
295 		      fdt_addr);
296 
297 		/* copy from dataflash if needed */
298 		fdt_addr = genimg_get_image(fdt_addr);
299 
300 		/*
301 		 * Check if there is an FDT image at the
302 		 * address provided in the second bootm argument
303 		 * check image type, for FIT images get a FIT node.
304 		 */
305 		buf = map_sysmem(fdt_addr, 0);
306 		switch (genimg_get_format(buf)) {
307 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
308 		case IMAGE_FORMAT_LEGACY:
309 			/* verify fdt_addr points to a valid image header */
310 			printf("## Flattened Device Tree from Legacy Image at %08lx\n",
311 			       fdt_addr);
312 			fdt_hdr = image_get_fdt(fdt_addr);
313 			if (!fdt_hdr)
314 				goto no_fdt;
315 
316 			/*
317 			 * move image data to the load address,
318 			 * make sure we don't overwrite initial image
319 			 */
320 			image_start = (ulong)fdt_hdr;
321 			image_data = (ulong)image_get_data(fdt_hdr);
322 			image_end = image_get_image_end(fdt_hdr);
323 
324 			load = image_get_load(fdt_hdr);
325 			load_end = load + image_get_data_size(fdt_hdr);
326 
327 			if (load == image_start ||
328 			    load == image_data) {
329 				fdt_addr = load;
330 				break;
331 			}
332 
333 			if ((load < image_end) && (load_end > image_start)) {
334 				fdt_error("fdt overwritten");
335 				goto error;
336 			}
337 
338 			debug("   Loading FDT from 0x%08lx to 0x%08lx\n",
339 			      image_data, load);
340 
341 			memmove((void *)load,
342 				(void *)image_data,
343 				image_get_data_size(fdt_hdr));
344 
345 			fdt_addr = load;
346 			break;
347 #endif
348 		case IMAGE_FORMAT_FIT:
349 			/*
350 			 * This case will catch both: new uImage format
351 			 * (libfdt based) and raw FDT blob (also libfdt
352 			 * based).
353 			 */
354 #if defined(CONFIG_FIT)
355 			/* check FDT blob vs FIT blob */
356 			if (fit_check_format(buf)) {
357 				ulong load, len;
358 
359 				fdt_noffset = fit_image_load(images,
360 					fdt_addr, &fit_uname_fdt,
361 					&fit_uname_config,
362 					arch, IH_TYPE_FLATDT,
363 					BOOTSTAGE_ID_FIT_FDT_START,
364 					FIT_LOAD_OPTIONAL, &load, &len);
365 
366 				images->fit_hdr_fdt = map_sysmem(fdt_addr, 0);
367 				images->fit_uname_fdt = fit_uname_fdt;
368 				images->fit_noffset_fdt = fdt_noffset;
369 				fdt_addr = load;
370 				break;
371 			} else
372 #endif
373 			{
374 				/*
375 				 * FDT blob
376 				 */
377 				debug("*  fdt: raw FDT blob\n");
378 				printf("## Flattened Device Tree blob at %08lx\n",
379 				       (long)fdt_addr);
380 			}
381 			break;
382 		default:
383 			puts("ERROR: Did not find a cmdline Flattened Device Tree\n");
384 			goto no_fdt;
385 		}
386 
387 		printf("   Booting using the fdt blob at %#08lx\n", fdt_addr);
388 		fdt_blob = map_sysmem(fdt_addr, 0);
389 	} else if (images->legacy_hdr_valid &&
390 			image_check_type(&images->legacy_hdr_os_copy,
391 					 IH_TYPE_MULTI)) {
392 		ulong fdt_data, fdt_len;
393 
394 		/*
395 		 * Now check if we have a legacy multi-component image,
396 		 * get second entry data start address and len.
397 		 */
398 		printf("## Flattened Device Tree from multi component Image at %08lX\n",
399 		       (ulong)images->legacy_hdr_os);
400 
401 		image_multi_getimg(images->legacy_hdr_os, 2, &fdt_data,
402 				   &fdt_len);
403 		if (fdt_len) {
404 			fdt_blob = (char *)fdt_data;
405 			printf("   Booting using the fdt at 0x%p\n", fdt_blob);
406 
407 			if (fdt_check_header(fdt_blob) != 0) {
408 				fdt_error("image is not a fdt");
409 				goto error;
410 			}
411 
412 			if (fdt_totalsize(fdt_blob) != fdt_len) {
413 				fdt_error("fdt size != image size");
414 				goto error;
415 			}
416 		} else {
417 			debug("## No Flattened Device Tree\n");
418 			goto no_fdt;
419 		}
420 	} else {
421 		debug("## No Flattened Device Tree\n");
422 		goto no_fdt;
423 	}
424 
425 	*of_flat_tree = fdt_blob;
426 	*of_size = fdt_totalsize(fdt_blob);
427 	debug("   of_flat_tree at 0x%08lx size 0x%08lx\n",
428 	      (ulong)*of_flat_tree, *of_size);
429 
430 	return 0;
431 
432 no_fdt:
433 	ok_no_fdt = 1;
434 error:
435 	*of_flat_tree = NULL;
436 	*of_size = 0;
437 	if (!select && ok_no_fdt) {
438 		debug("Continuing to boot without FDT\n");
439 		return 0;
440 	}
441 	return 1;
442 }
443 
444 /*
445  * Verify the device tree.
446  *
447  * This function is called after all device tree fix-ups have been enacted,
448  * so that the final device tree can be verified.  The definition of "verified"
449  * is up to the specific implementation.  However, it generally means that the
450  * addresses of some of the devices in the device tree are compared with the
451  * actual addresses at which U-Boot has placed them.
452  *
453  * Returns 1 on success, 0 on failure.  If 0 is returned, U-Boot will halt the
454  * boot process.
455  */
456 __weak int ft_verify_fdt(void *fdt)
457 {
458 	return 1;
459 }
460 
461 __weak int arch_fixup_fdt(void *blob)
462 {
463 	return 0;
464 }
465 
466 int image_setup_libfdt(bootm_headers_t *images, void *blob,
467 		       int of_size, struct lmb *lmb)
468 {
469 	ulong *initrd_start = &images->initrd_start;
470 	ulong *initrd_end = &images->initrd_end;
471 	int ret = -EPERM;
472 	int fdt_ret;
473 
474 	if (fdt_root(blob) < 0) {
475 		printf("ERROR: root node setup failed\n");
476 		goto err;
477 	}
478 	if (fdt_chosen(blob) < 0) {
479 		printf("ERROR: /chosen node create failed\n");
480 		goto err;
481 	}
482 	if (arch_fixup_fdt(blob) < 0) {
483 		printf("ERROR: arch-specific fdt fixup failed\n");
484 		goto err;
485 	}
486 	if (IMAGE_OF_BOARD_SETUP) {
487 		fdt_ret = ft_board_setup(blob, gd->bd);
488 		if (fdt_ret) {
489 			printf("ERROR: board-specific fdt fixup failed: %s\n",
490 			       fdt_strerror(fdt_ret));
491 			goto err;
492 		}
493 	}
494 	if (IMAGE_OF_SYSTEM_SETUP) {
495 		fdt_ret = ft_system_setup(blob, gd->bd);
496 		if (fdt_ret) {
497 			printf("ERROR: system-specific fdt fixup failed: %s\n",
498 			       fdt_strerror(fdt_ret));
499 			goto err;
500 		}
501 	}
502 	fdt_fixup_ethernet(blob);
503 
504 	/* Delete the old LMB reservation */
505 	lmb_free(lmb, (phys_addr_t)(u32)(uintptr_t)blob,
506 		 (phys_size_t)fdt_totalsize(blob));
507 
508 	ret = fdt_shrink_to_minimum(blob);
509 	if (ret < 0)
510 		goto err;
511 	of_size = ret;
512 
513 	if (*initrd_start && *initrd_end) {
514 		of_size += FDT_RAMDISK_OVERHEAD;
515 		fdt_set_totalsize(blob, of_size);
516 	}
517 	/* Create a new LMB reservation */
518 	lmb_reserve(lmb, (ulong)blob, of_size);
519 
520 	fdt_initrd(blob, *initrd_start, *initrd_end);
521 	if (!ft_verify_fdt(blob))
522 		goto err;
523 
524 #if defined(CONFIG_SOC_KEYSTONE)
525 	if (IMAGE_OF_BOARD_SETUP)
526 		ft_board_setup_ex(blob, gd->bd);
527 #endif
528 
529 	return 0;
530 err:
531 	printf(" - must RESET the board to recover.\n\n");
532 
533 	return ret;
534 }
535