tools/rkspi.c

   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  * See README.rockchip for details of the rkspi format
   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         RKSPI_SECT_LEN          = RK_BLK_SIZE * 4,
  18 };
  19
  20 static char dummy_hdr[RK_IMAGE_HEADER_LEN];
  21
  22 static int rkspi_verify_header(unsigned char *buf, int size,
  23                                struct image_tool_params *params)
  24 {
  25         return 0;
  26 }
  27
  28 static void rkspi_print_header(const void *buf)
  29 {
  30 }
  31
  32 static void rkspi_set_header(void *buf, struct stat *sbuf, int ifd,
  33                              struct image_tool_params *params)
  34 {
  35         int sector;
  36         unsigned int size;
  37         int ret;
  38
  39         size = params->orig_file_size;
  40         ret = rkcommon_set_header(buf, size, params);
  41         debug("size %x\n", size);
  42         if (ret) {
  43                 /* TODO(sjg@chromium.org): This method should return an error */
  44                 printf("Warning: SPL image is too large (size %#x) and will not boot\n",
  45                        size);
  46         }
  47
  48         memcpy(buf + RK_SPL_HDR_START, rkcommon_get_spl_hdr(params),
  49                RK_SPL_HDR_SIZE);
  50
  51         if (rkcommon_need_rc4_spl(params))
  52                 rkcommon_rc4_encode_spl(buf, RK_SPL_START - 4,
  53                                         params->file_size - RK_SPL_START + 4);
  54
  55         /*
  56          * Spread the image out so we only use the first 2KB of each 4KB
  57          * region. This is a feature of the SPI format required by the Rockchip
  58          * boot ROM. Its rationale is unknown.
  59          */
  60         for (sector = size / RKSPI_SECT_LEN - 1; sector >= 0; sector--) {
  61                 debug("sector %u\n", sector);
  62                 memmove(buf + sector * RKSPI_SECT_LEN * 2,
  63                         buf + sector * RKSPI_SECT_LEN,
  64                         RKSPI_SECT_LEN);
  65                 memset(buf + sector * RKSPI_SECT_LEN * 2 + RKSPI_SECT_LEN,
  66                        '\0', RKSPI_SECT_LEN);
  67         }
  68 }
  69
  70 static int rkspi_extract_subimage(void *buf, struct image_tool_params *params)
  71 {
  72         return 0;
  73 }
  74
  75 static int rkspi_check_image_type(uint8_t type)
  76 {
  77         if (type == IH_TYPE_RKSPI)
  78                 return EXIT_SUCCESS;
  79         else
  80                 return EXIT_FAILURE;
  81 }
  82
  83 /* We pad the file out to a fixed size - this method returns that size */
  84 static int rkspi_vrec_header(struct image_tool_params *params,
  85                              struct image_type_params *tparams)
  86 {
  87         int pad_size;
  88
  89         pad_size = (rkcommon_get_spl_size(params) + 0x7ff) / 0x800 * 0x800;
  90         params->orig_file_size = pad_size;
  91
  92         /* We will double the image size due to the SPI format */
  93         pad_size *= 2;
  94         pad_size += RK_SPL_HDR_START;
  95         debug("pad_size %x\n", pad_size);
  96
  97         return pad_size - params->file_size;
  98 }
  99
 100 /*
 101  * rk_spi parameters
 102  */
 103 U_BOOT_IMAGE_TYPE(
 104         rkspi,
 105         "Rockchip SPI Boot Image support",
 106         RK_IMAGE_HEADER_LEN,
 107         dummy_hdr,
 108         rkcommon_check_params,
 109         rkspi_verify_header,
 110         rkspi_print_header,
 111         rkspi_set_header,
 112         rkspi_extract_subimage,
 113         rkspi_check_image_type,
 114         NULL,
 115         rkspi_vrec_header
 116 );