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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
16enum {
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
3641339e 28 * @init_offset: Offset in blocks of the SPL code from this header
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29 * block. E.g. 4 means 2KB after the start of this header.
30 * Other fields are not used by U-Boot
31 */
32struct header0_info {
33 uint32_t signature;
34 uint8_t reserved[4];
35 uint32_t disable_rc4;
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36 uint16_t init_offset;
37 uint8_t reserved1[492];
38 uint16_t init_size;
39 uint16_t init_boot_size;
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40 uint8_t reserved2[2];
41};
42
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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 */
50struct spl_info {
51 const char *imagename;
52 const char *spl_hdr;
53 const uint32_t spl_size;
54};
55
56static struct spl_info spl_infos[] = {
57 { "rk3036", "RK30", 0x1000 },
58 { "rk3288", "RK32", 0x8000 },
9191090e 59 { "rk3399", "RK33", 0x20000 },
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60};
61
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62static 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
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67static 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
78int 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
96const 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
106int 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
116int rkcommon_set_header(void *buf, uint file_size,
117 struct image_tool_params *params)
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118{
119 struct header0_info *hdr;
120
7bf274b9 121 if (file_size > rkcommon_get_spl_size(params))
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122 return -ENOSPC;
123
3641339e 124 memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
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125 hdr = (struct header0_info *)buf;
126 hdr->signature = RK_SIGNATURE;
127 hdr->disable_rc4 = 1;
3641339e 128 hdr->init_offset = RK_INIT_OFFSET;
a131c1f4 129
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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;
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133
134 rc4_encode(buf, RK_BLK_SIZE, rc4_key);
135
136 return 0;
137}