xref: /openbmc/u-boot/common/boot_fit.c (revision e3963c09)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2017
4  * Texas Instruments, <www.ti.com>
5  *
6  * Franklin S Cooper Jr. <fcooper@ti.com>
7  */
8 
9 #include <boot_fit.h>
10 #include <common.h>
11 #include <errno.h>
12 #include <image.h>
13 #include <linux/libfdt.h>
14 
15 static int fdt_offset(const void *fit)
16 {
17 	int images, node, fdt_len, fdt_node, fdt_offset;
18 	const char *fdt_name;
19 
20 	node = fit_find_config_node(fit);
21 	if (node < 0)
22 		return node;
23 
24 	images = fdt_path_offset(fit, FIT_IMAGES_PATH);
25 	if (images < 0) {
26 		debug("%s: Cannot find /images node: %d\n", __func__, images);
27 		return -EINVAL;
28 	}
29 
30 	fdt_name = fdt_getprop(fit, node, FIT_FDT_PROP, &fdt_len);
31 	if (!fdt_name) {
32 		debug("%s: Cannot find fdt name property: %d\n",
33 		      __func__, fdt_len);
34 		return -EINVAL;
35 	}
36 
37 	fdt_node = fdt_subnode_offset(fit, images, fdt_name);
38 	if (fdt_node < 0) {
39 		debug("%s: Cannot find fdt node '%s': %d\n",
40 		      __func__, fdt_name, fdt_node);
41 		return -EINVAL;
42 	}
43 
44 	fdt_offset = fdt_getprop_u32(fit, fdt_node, "data-offset");
45 
46 	if (fdt_offset == FDT_ERROR)
47 		return -ENOENT;
48 
49 	fdt_len = fdt_getprop_u32(fit, fdt_node, "data-size");
50 
51 	if (fdt_len < 0)
52 		return fdt_len;
53 
54 	return fdt_offset;
55 }
56 
57 void *locate_dtb_in_fit(const void *fit)
58 {
59 	struct image_header *header;
60 	int size;
61 	int ret;
62 
63 	size = fdt_totalsize(fit);
64 	size = (size + 3) & ~3;
65 
66 	header = (struct image_header *)fit;
67 
68 	if (image_get_magic(header) != FDT_MAGIC) {
69 		debug("No FIT image appended to U-boot\n");
70 		return NULL;
71 	}
72 
73 	ret = fdt_offset(fit);
74 
75 	if (ret < 0)
76 		return NULL;
77 	else
78 		return (void *)fit+size+ret;
79 }
80