xref: /openbmc/u-boot/tools/rkcommon.c (revision 70b26cd0)
1 /*
2  * (C) Copyright 2015 Google,  Inc
3  * Written by Simon Glass <sjg@chromium.org>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  *
7  * Helper functions for Rockchip images
8  */
9 
10 #include "imagetool.h"
11 #include <image.h>
12 #include <rc4.h>
13 #include "mkimage.h"
14 #include "rkcommon.h"
15 
16 enum {
17 	RK_SIGNATURE		= 0x0ff0aa55,
18 };
19 
20 /**
21  * struct header0_info - header block for boot ROM
22  *
23  * This is stored at SD card block 64 (where each block is 512 bytes, or at
24  * the start of SPI flash. It is encoded with RC4.
25  *
26  * @signature:		Signature (must be RKSD_SIGNATURE)
27  * @disable_rc4:	0 to use rc4 for boot image,  1 to use plain binary
28  * @init_offset:	Offset in blocks of the SPL code from this header
29  *			block. E.g. 4 means 2KB after the start of this header.
30  * Other fields are not used by U-Boot
31  */
32 struct header0_info {
33 	uint32_t signature;
34 	uint8_t reserved[4];
35 	uint32_t disable_rc4;
36 	uint16_t init_offset;
37 	uint8_t reserved1[492];
38 	uint16_t init_size;
39 	uint16_t init_boot_size;
40 	uint8_t reserved2[2];
41 };
42 
43 /**
44  * struct spl_info - spl info for each chip
45  *
46  * @imagename:		Image name(passed by "mkimage -n")
47  * @spl_hdr:		Boot ROM requires a 4-bytes spl header
48  * @spl_size:		Spl size(include extra 4-bytes spl header)
49  */
50 struct spl_info {
51 	const char *imagename;
52 	const char *spl_hdr;
53 	const uint32_t spl_size;
54 };
55 
56 static struct spl_info spl_infos[] = {
57 	{ "rk3036", "RK30", 0x1000 },
58 	{ "rk3288", "RK32", 0x8000 },
59 	{ "rk3399", "RK33", 0x20000 },
60 };
61 
62 static unsigned char rc4_key[16] = {
63 	124, 78, 3, 4, 85, 5, 9, 7,
64 	45, 44, 123, 56, 23, 13, 23, 17
65 };
66 
67 static struct spl_info *rkcommon_get_spl_info(char *imagename)
68 {
69 	int i;
70 
71 	for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
72 		if (!strncmp(imagename, spl_infos[i].imagename, 6))
73 			return spl_infos + i;
74 
75 	return NULL;
76 }
77 
78 int rkcommon_check_params(struct image_tool_params *params)
79 {
80 	int i;
81 
82 	if (rkcommon_get_spl_info(params->imagename) != NULL)
83 		return 0;
84 
85 	fprintf(stderr, "ERROR: imagename (%s) is not supported!\n",
86 		strlen(params->imagename) > 0 ? params->imagename : "NULL");
87 
88 	fprintf(stderr, "Available imagename:");
89 	for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
90 		fprintf(stderr, "\t%s", spl_infos[i].imagename);
91 	fprintf(stderr, "\n");
92 
93 	return -1;
94 }
95 
96 const char *rkcommon_get_spl_hdr(struct image_tool_params *params)
97 {
98 	struct spl_info *info = rkcommon_get_spl_info(params->imagename);
99 
100 	/*
101 	 * info would not be NULL, because of we checked params before.
102 	 */
103 	return info->spl_hdr;
104 }
105 
106 int rkcommon_get_spl_size(struct image_tool_params *params)
107 {
108 	struct spl_info *info = rkcommon_get_spl_info(params->imagename);
109 
110 	/*
111 	 * info would not be NULL, because of we checked params before.
112 	 */
113 	return info->spl_size;
114 }
115 
116 int rkcommon_set_header(void *buf, uint file_size,
117 			struct image_tool_params *params)
118 {
119 	struct header0_info *hdr;
120 
121 	if (file_size > rkcommon_get_spl_size(params))
122 		return -ENOSPC;
123 
124 	memset(buf,  '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
125 	hdr = (struct header0_info *)buf;
126 	hdr->signature = RK_SIGNATURE;
127 	hdr->disable_rc4 = 1;
128 	hdr->init_offset = RK_INIT_OFFSET;
129 
130 	hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE;
131 	hdr->init_size = (hdr->init_size + 3) & ~3;
132 	hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;
133 
134 	rc4_encode(buf, RK_BLK_SIZE, rc4_key);
135 
136 	return 0;
137 }
138