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 * @spl_rc4: RC4 encode the SPL binary (same key as header) 50 */ 51 struct spl_info { 52 const char *imagename; 53 const char *spl_hdr; 54 const uint32_t spl_size; 55 const bool spl_rc4; 56 }; 57 58 static struct spl_info spl_infos[] = { 59 { "rk3036", "RK30", 0x1000, false }, 60 { "rk3188", "RK31", 0x8000 - 0x800, true }, 61 { "rk3288", "RK32", 0x8000, false }, 62 { "rk3399", "RK33", 0x20000, false }, 63 }; 64 65 static unsigned char rc4_key[16] = { 66 124, 78, 3, 4, 85, 5, 9, 7, 67 45, 44, 123, 56, 23, 13, 23, 17 68 }; 69 70 static struct spl_info *rkcommon_get_spl_info(char *imagename) 71 { 72 int i; 73 74 for (i = 0; i < ARRAY_SIZE(spl_infos); i++) 75 if (!strncmp(imagename, spl_infos[i].imagename, 6)) 76 return spl_infos + i; 77 78 return NULL; 79 } 80 81 int rkcommon_check_params(struct image_tool_params *params) 82 { 83 int i; 84 85 if (rkcommon_get_spl_info(params->imagename) != NULL) 86 return 0; 87 88 fprintf(stderr, "ERROR: imagename (%s) is not supported!\n", 89 strlen(params->imagename) > 0 ? params->imagename : "NULL"); 90 91 fprintf(stderr, "Available imagename:"); 92 for (i = 0; i < ARRAY_SIZE(spl_infos); i++) 93 fprintf(stderr, "\t%s", spl_infos[i].imagename); 94 fprintf(stderr, "\n"); 95 96 return -1; 97 } 98 99 const char *rkcommon_get_spl_hdr(struct image_tool_params *params) 100 { 101 struct spl_info *info = rkcommon_get_spl_info(params->imagename); 102 103 /* 104 * info would not be NULL, because of we checked params before. 105 */ 106 return info->spl_hdr; 107 } 108 109 int rkcommon_get_spl_size(struct image_tool_params *params) 110 { 111 struct spl_info *info = rkcommon_get_spl_info(params->imagename); 112 113 /* 114 * info would not be NULL, because of we checked params before. 115 */ 116 return info->spl_size; 117 } 118 119 bool rkcommon_need_rc4_spl(struct image_tool_params *params) 120 { 121 struct spl_info *info = rkcommon_get_spl_info(params->imagename); 122 123 /* 124 * info would not be NULL, because of we checked params before. 125 */ 126 return info->spl_rc4; 127 } 128 129 int rkcommon_set_header(void *buf, uint file_size, 130 struct image_tool_params *params) 131 { 132 struct header0_info *hdr; 133 134 if (file_size > rkcommon_get_spl_size(params)) 135 return -ENOSPC; 136 137 memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE); 138 hdr = (struct header0_info *)buf; 139 hdr->signature = RK_SIGNATURE; 140 hdr->disable_rc4 = !rkcommon_need_rc4_spl(params); 141 hdr->init_offset = RK_INIT_OFFSET; 142 143 hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE; 144 hdr->init_size = (hdr->init_size + 3) & ~3; 145 hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE; 146 147 rc4_encode(buf, RK_BLK_SIZE, rc4_key); 148 149 return 0; 150 } 151 152 void rkcommon_rc4_encode_spl(void *buf, unsigned int offset, unsigned int size) 153 { 154 unsigned int remaining = size; 155 156 while (remaining > 0) { 157 int step = (remaining > RK_BLK_SIZE) ? RK_BLK_SIZE : remaining; 158 159 rc4_encode(buf + offset, step, rc4_key); 160 offset += RK_BLK_SIZE; 161 remaining -= step; 162 } 163 } 164