xref: /openbmc/u-boot/common/spl/spl_fit.c (revision 1bad5e14)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Google, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6 
7 #include <common.h>
8 #include <errno.h>
9 #include <fpga.h>
10 #include <image.h>
11 #include <linux/libfdt.h>
12 #include <spl.h>
13 
14 #ifndef CONFIG_SYS_BOOTM_LEN
15 #define CONFIG_SYS_BOOTM_LEN	(64 << 20)
16 #endif
17 
18 /**
19  * spl_fit_get_image_name(): By using the matching configuration subnode,
20  * retrieve the name of an image, specified by a property name and an index
21  * into that.
22  * @fit:	Pointer to the FDT blob.
23  * @images:	Offset of the /images subnode.
24  * @type:	Name of the property within the configuration subnode.
25  * @index:	Index into the list of strings in this property.
26  * @outname:	Name of the image
27  *
28  * Return:	0 on success, or a negative error number
29  */
30 static int spl_fit_get_image_name(const void *fit, int images,
31 				  const char *type, int index,
32 				  char **outname)
33 {
34 	const char *name, *str;
35 	__maybe_unused int node;
36 	int conf_node;
37 	int len, i;
38 
39 	conf_node = fit_find_config_node(fit);
40 	if (conf_node < 0) {
41 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
42 		printf("No matching DT out of these options:\n");
43 		for (node = fdt_first_subnode(fit, conf_node);
44 		     node >= 0;
45 		     node = fdt_next_subnode(fit, node)) {
46 			name = fdt_getprop(fit, node, "description", &len);
47 			printf("   %s\n", name);
48 		}
49 #endif
50 		return conf_node;
51 	}
52 
53 	name = fdt_getprop(fit, conf_node, type, &len);
54 	if (!name) {
55 		debug("cannot find property '%s': %d\n", type, len);
56 		return -EINVAL;
57 	}
58 
59 	str = name;
60 	for (i = 0; i < index; i++) {
61 		str = strchr(str, '\0') + 1;
62 		if (!str || (str - name >= len)) {
63 			debug("no string for index %d\n", index);
64 			return -E2BIG;
65 		}
66 	}
67 
68 	*outname = (char *)str;
69 	return 0;
70 }
71 
72 /**
73  * spl_fit_get_image_node(): By using the matching configuration subnode,
74  * retrieve the name of an image, specified by a property name and an index
75  * into that.
76  * @fit:	Pointer to the FDT blob.
77  * @images:	Offset of the /images subnode.
78  * @type:	Name of the property within the configuration subnode.
79  * @index:	Index into the list of strings in this property.
80  *
81  * Return:	the node offset of the respective image node or a negative
82  *		error number.
83  */
84 static int spl_fit_get_image_node(const void *fit, int images,
85 				  const char *type, int index)
86 {
87 	char *str;
88 	int err;
89 	int node;
90 
91 	err = spl_fit_get_image_name(fit, images, type, index, &str);
92 	if (err)
93 		return err;
94 
95 	debug("%s: '%s'\n", type, str);
96 
97 	node = fdt_subnode_offset(fit, images, str);
98 	if (node < 0) {
99 		debug("cannot find image node '%s': %d\n", str, node);
100 		return -EINVAL;
101 	}
102 
103 	return node;
104 }
105 
106 static int get_aligned_image_offset(struct spl_load_info *info, int offset)
107 {
108 	/*
109 	 * If it is a FS read, get the first address before offset which is
110 	 * aligned to ARCH_DMA_MINALIGN. If it is raw read return the
111 	 * block number to which offset belongs.
112 	 */
113 	if (info->filename)
114 		return offset & ~(ARCH_DMA_MINALIGN - 1);
115 
116 	return offset / info->bl_len;
117 }
118 
119 static int get_aligned_image_overhead(struct spl_load_info *info, int offset)
120 {
121 	/*
122 	 * If it is a FS read, get the difference between the offset and
123 	 * the first address before offset which is aligned to
124 	 * ARCH_DMA_MINALIGN. If it is raw read return the offset within the
125 	 * block.
126 	 */
127 	if (info->filename)
128 		return offset & (ARCH_DMA_MINALIGN - 1);
129 
130 	return offset % info->bl_len;
131 }
132 
133 static int get_aligned_image_size(struct spl_load_info *info, int data_size,
134 				  int offset)
135 {
136 	data_size = data_size + get_aligned_image_overhead(info, offset);
137 
138 	if (info->filename)
139 		return data_size;
140 
141 	return (data_size + info->bl_len - 1) / info->bl_len;
142 }
143 
144 /**
145  * spl_load_fit_image(): load the image described in a certain FIT node
146  * @info:	points to information about the device to load data from
147  * @sector:	the start sector of the FIT image on the device
148  * @fit:	points to the flattened device tree blob describing the FIT
149  *		image
150  * @base_offset: the beginning of the data area containing the actual
151  *		image data, relative to the beginning of the FIT
152  * @node:	offset of the DT node describing the image to load (relative
153  *		to @fit)
154  * @image_info:	will be filled with information about the loaded image
155  *		If the FIT node does not contain a "load" (address) property,
156  *		the image gets loaded to the address pointed to by the
157  *		load_addr member in this struct.
158  *
159  * Return:	0 on success or a negative error number.
160  */
161 static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
162 			      void *fit, ulong base_offset, int node,
163 			      struct spl_image_info *image_info)
164 {
165 	int offset;
166 	size_t length;
167 	int len;
168 	ulong size;
169 	ulong load_addr, load_ptr;
170 	void *src;
171 	ulong overhead;
172 	int nr_sectors;
173 	int align_len = ARCH_DMA_MINALIGN - 1;
174 	uint8_t image_comp = -1, type = -1;
175 	const void *data;
176 	bool external_data = false;
177 
178 	if (IS_ENABLED(CONFIG_SPL_FPGA_SUPPORT) ||
179 	    (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP))) {
180 		if (fit_image_get_type(fit, node, &type))
181 			puts("Cannot get image type.\n");
182 		else
183 			debug("%s ", genimg_get_type_name(type));
184 	}
185 
186 	if (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP)) {
187 		if (fit_image_get_comp(fit, node, &image_comp))
188 			puts("Cannot get image compression format.\n");
189 		else
190 			debug("%s ", genimg_get_comp_name(image_comp));
191 	}
192 
193 	if (fit_image_get_load(fit, node, &load_addr))
194 		load_addr = image_info->load_addr;
195 
196 	if (!fit_image_get_data_position(fit, node, &offset)) {
197 		external_data = true;
198 	} else if (!fit_image_get_data_offset(fit, node, &offset)) {
199 		offset += base_offset;
200 		external_data = true;
201 	}
202 
203 	if (external_data) {
204 		/* External data */
205 		if (fit_image_get_data_size(fit, node, &len))
206 			return -ENOENT;
207 
208 		load_ptr = (load_addr + align_len) & ~align_len;
209 		length = len;
210 
211 		overhead = get_aligned_image_overhead(info, offset);
212 		nr_sectors = get_aligned_image_size(info, length, offset);
213 
214 		if (info->read(info,
215 			       sector + get_aligned_image_offset(info, offset),
216 			       nr_sectors, (void *)load_ptr) != nr_sectors)
217 			return -EIO;
218 
219 		debug("External data: dst=%lx, offset=%x, size=%lx\n",
220 		      load_ptr, offset, (unsigned long)length);
221 		src = (void *)load_ptr + overhead;
222 	} else {
223 		/* Embedded data */
224 		if (fit_image_get_data(fit, node, &data, &length)) {
225 			puts("Cannot get image data/size\n");
226 			return -ENOENT;
227 		}
228 		debug("Embedded data: dst=%lx, size=%lx\n", load_addr,
229 		      (unsigned long)length);
230 		src = (void *)data;
231 	}
232 
233 #ifdef CONFIG_SPL_FIT_SIGNATURE
234 	printf("## Checking hash(es) for Image %s ... ",
235 	       fit_get_name(fit, node, NULL));
236 	if (!fit_image_verify_with_data(fit, node,
237 					 src, length))
238 		return -EPERM;
239 	puts("OK\n");
240 #endif
241 
242 #ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
243 	board_fit_image_post_process(&src, &length);
244 #endif
245 
246 	if (IS_ENABLED(CONFIG_SPL_GZIP) && image_comp == IH_COMP_GZIP) {
247 		size = length;
248 		if (gunzip((void *)load_addr, CONFIG_SYS_BOOTM_LEN,
249 			   src, &size)) {
250 			puts("Uncompressing error\n");
251 			return -EIO;
252 		}
253 		length = size;
254 	} else {
255 		memcpy((void *)load_addr, src, length);
256 	}
257 
258 	if (image_info) {
259 		image_info->load_addr = load_addr;
260 		image_info->size = length;
261 		image_info->entry_point = fdt_getprop_u32(fit, node, "entry");
262 	}
263 
264 	return 0;
265 }
266 
267 static int spl_fit_append_fdt(struct spl_image_info *spl_image,
268 			      struct spl_load_info *info, ulong sector,
269 			      void *fit, int images, ulong base_offset)
270 {
271 	struct spl_image_info image_info;
272 	int node, ret;
273 
274 	/* Figure out which device tree the board wants to use */
275 	node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP, 0);
276 	if (node < 0) {
277 		debug("%s: cannot find FDT node\n", __func__);
278 		return node;
279 	}
280 
281 	/*
282 	 * Read the device tree and place it after the image.
283 	 * Align the destination address to ARCH_DMA_MINALIGN.
284 	 */
285 	image_info.load_addr = spl_image->load_addr + spl_image->size;
286 	ret = spl_load_fit_image(info, sector, fit, base_offset, node,
287 				 &image_info);
288 
289 	if (ret < 0)
290 		return ret;
291 
292 	/* Make the load-address of the FDT available for the SPL framework */
293 	spl_image->fdt_addr = (void *)image_info.load_addr;
294 #if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
295 	/* Try to make space, so we can inject details on the loadables */
296 	ret = fdt_shrink_to_minimum(spl_image->fdt_addr, 8192);
297 #endif
298 
299 	return ret;
300 }
301 
302 static int spl_fit_record_loadable(const void *fit, int images, int index,
303 				   void *blob, struct spl_image_info *image)
304 {
305 	int ret = 0;
306 #if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
307 	char *name;
308 	int node;
309 
310 	ret = spl_fit_get_image_name(fit, images, "loadables",
311 				     index, &name);
312 	if (ret < 0)
313 		return ret;
314 
315 	node = spl_fit_get_image_node(fit, images, "loadables", index);
316 
317 	ret = fdt_record_loadable(blob, index, name, image->load_addr,
318 				  image->size, image->entry_point,
319 				  fdt_getprop(fit, node, "type", NULL),
320 				  fdt_getprop(fit, node, "os", NULL));
321 #endif
322 	return ret;
323 }
324 
325 static int spl_fit_image_get_os(const void *fit, int noffset, uint8_t *os)
326 {
327 #if CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
328 	return -ENOTSUPP;
329 #else
330 	return fit_image_get_os(fit, noffset, os);
331 #endif
332 }
333 
334 int spl_load_simple_fit(struct spl_image_info *spl_image,
335 			struct spl_load_info *info, ulong sector, void *fit)
336 {
337 	int sectors;
338 	ulong size;
339 	unsigned long count;
340 	struct spl_image_info image_info;
341 	int node = -1;
342 	int images, ret;
343 	int base_offset, hsize, align_len = ARCH_DMA_MINALIGN - 1;
344 	int index = 0;
345 
346 	/*
347 	 * For FIT with external data, figure out where the external images
348 	 * start. This is the base for the data-offset properties in each
349 	 * image.
350 	 */
351 	size = fdt_totalsize(fit);
352 	size = (size + 3) & ~3;
353 	base_offset = (size + 3) & ~3;
354 
355 	/*
356 	 * So far we only have one block of data from the FIT. Read the entire
357 	 * thing, including that first block, placing it so it finishes before
358 	 * where we will load the image.
359 	 *
360 	 * Note that we will load the image such that its first byte will be
361 	 * at the load address. Since that byte may be part-way through a
362 	 * block, we may load the image up to one block before the load
363 	 * address. So take account of that here by subtracting an addition
364 	 * block length from the FIT start position.
365 	 *
366 	 * In fact the FIT has its own load address, but we assume it cannot
367 	 * be before CONFIG_SYS_TEXT_BASE.
368 	 *
369 	 * For FIT with data embedded, data is loaded as part of FIT image.
370 	 * For FIT with external data, data is not loaded in this step.
371 	 */
372 	hsize = (size + info->bl_len + align_len) & ~align_len;
373 	fit = spl_get_load_buffer(-hsize, hsize);
374 	sectors = get_aligned_image_size(info, size, 0);
375 	count = info->read(info, sector, sectors, fit);
376 	debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n",
377 	      sector, sectors, fit, count);
378 	if (count == 0)
379 		return -EIO;
380 
381 	/* find the node holding the images information */
382 	images = fdt_path_offset(fit, FIT_IMAGES_PATH);
383 	if (images < 0) {
384 		debug("%s: Cannot find /images node: %d\n", __func__, images);
385 		return -1;
386 	}
387 
388 #ifdef CONFIG_SPL_FPGA_SUPPORT
389 	node = spl_fit_get_image_node(fit, images, "fpga", 0);
390 	if (node >= 0) {
391 		/* Load the image and set up the spl_image structure */
392 		ret = spl_load_fit_image(info, sector, fit, base_offset, node,
393 					 spl_image);
394 		if (ret) {
395 			printf("%s: Cannot load the FPGA: %i\n", __func__, ret);
396 			return ret;
397 		}
398 
399 		debug("FPGA bitstream at: %x, size: %x\n",
400 		      (u32)spl_image->load_addr, spl_image->size);
401 
402 		ret = fpga_load(0, (const void *)spl_image->load_addr,
403 				spl_image->size, BIT_FULL);
404 		if (ret) {
405 			printf("%s: Cannot load the image to the FPGA\n",
406 			       __func__);
407 			return ret;
408 		}
409 
410 		puts("FPGA image loaded from FIT\n");
411 		node = -1;
412 	}
413 #endif
414 
415 	/*
416 	 * Find the U-Boot image using the following search order:
417 	 *   - start at 'firmware' (e.g. an ARM Trusted Firmware)
418 	 *   - fall back 'kernel' (e.g. a Falcon-mode OS boot
419 	 *   - fall back to using the first 'loadables' entry
420 	 */
421 	if (node < 0)
422 		node = spl_fit_get_image_node(fit, images, FIT_FIRMWARE_PROP,
423 					      0);
424 #ifdef CONFIG_SPL_OS_BOOT
425 	if (node < 0)
426 		node = spl_fit_get_image_node(fit, images, FIT_KERNEL_PROP, 0);
427 #endif
428 	if (node < 0) {
429 		debug("could not find firmware image, trying loadables...\n");
430 		node = spl_fit_get_image_node(fit, images, "loadables", 0);
431 		/*
432 		 * If we pick the U-Boot image from "loadables", start at
433 		 * the second image when later loading additional images.
434 		 */
435 		index = 1;
436 	}
437 	if (node < 0) {
438 		debug("%s: Cannot find u-boot image node: %d\n",
439 		      __func__, node);
440 		return -1;
441 	}
442 
443 	/* Load the image and set up the spl_image structure */
444 	ret = spl_load_fit_image(info, sector, fit, base_offset, node,
445 				 spl_image);
446 	if (ret)
447 		return ret;
448 
449 	/*
450 	 * For backward compatibility, we treat the first node that is
451 	 * as a U-Boot image, if no OS-type has been declared.
452 	 */
453 	if (!spl_fit_image_get_os(fit, node, &spl_image->os))
454 		debug("Image OS is %s\n", genimg_get_os_name(spl_image->os));
455 #if !defined(CONFIG_SPL_OS_BOOT)
456 	else
457 		spl_image->os = IH_OS_U_BOOT;
458 #endif
459 
460 	/*
461 	 * Booting a next-stage U-Boot may require us to append the FDT.
462 	 * We allow this to fail, as the U-Boot image might embed its FDT.
463 	 */
464 	if (spl_image->os == IH_OS_U_BOOT)
465 		spl_fit_append_fdt(spl_image, info, sector, fit,
466 				   images, base_offset);
467 
468 	/* Now check if there are more images for us to load */
469 	for (; ; index++) {
470 		uint8_t os_type = IH_OS_INVALID;
471 
472 		node = spl_fit_get_image_node(fit, images, "loadables", index);
473 		if (node < 0)
474 			break;
475 
476 		ret = spl_load_fit_image(info, sector, fit, base_offset, node,
477 					 &image_info);
478 		if (ret < 0)
479 			continue;
480 
481 		if (!spl_fit_image_get_os(fit, node, &os_type))
482 			debug("Loadable is %s\n", genimg_get_os_name(os_type));
483 
484 		if (os_type == IH_OS_U_BOOT) {
485 			spl_fit_append_fdt(&image_info, info, sector,
486 					   fit, images, base_offset);
487 			spl_image->fdt_addr = image_info.fdt_addr;
488 		}
489 
490 		/*
491 		 * If the "firmware" image did not provide an entry point,
492 		 * use the first valid entry point from the loadables.
493 		 */
494 		if (spl_image->entry_point == FDT_ERROR &&
495 		    image_info.entry_point != FDT_ERROR)
496 			spl_image->entry_point = image_info.entry_point;
497 
498 		/* Record our loadables into the FDT */
499 		if (spl_image->fdt_addr)
500 			spl_fit_record_loadable(fit, images, index,
501 						spl_image->fdt_addr,
502 						&image_info);
503 	}
504 
505 	/*
506 	 * If a platform does not provide CONFIG_SYS_UBOOT_START, U-Boot's
507 	 * Makefile will set it to 0 and it will end up as the entry point
508 	 * here. What it actually means is: use the load address.
509 	 */
510 	if (spl_image->entry_point == FDT_ERROR || spl_image->entry_point == 0)
511 		spl_image->entry_point = spl_image->load_addr;
512 
513 	return 0;
514 }
515