tools/rkspi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2015 Google,  Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  *
   6  * See README.rockchip for details of the rkspi format
   7  */
   8
   9 #include "imagetool.h"
  10 #include <image.h>
  11 #include <rc4.h>
  12 #include "mkimage.h"
  13 #include "rkcommon.h"
  14
  15 enum {
  16         RKSPI_SECT_LEN          = RK_BLK_SIZE * 4,
  17 };
  18
  19 static void rkspi_set_header(void *buf, struct stat *sbuf, int ifd,
  20                              struct image_tool_params *params)
  21 {
  22         int sector;
  23         unsigned int size;
  24
  25         size = params->orig_file_size;
  26
  27         rkcommon_set_header(buf, sbuf, ifd, params);
  28
  29         /*
  30          * Spread the image out so we only use the first 2KB of each 4KB
  31          * region. This is a feature of the SPI format required by the Rockchip
  32          * boot ROM. Its rationale is unknown.
  33          */
  34         if (params->vflag)
  35                 fprintf(stderr, "Spreading spi image from %u to %u\n",
  36                         size, params->file_size);
  37
  38         for (sector = size / RKSPI_SECT_LEN - 1; sector >= 0; sector--) {
  39                 debug("sector %u\n", sector);
  40                 memmove(buf + sector * RKSPI_SECT_LEN * 2,
  41                         buf + sector * RKSPI_SECT_LEN,
  42                         RKSPI_SECT_LEN);
  43                 memset(buf + sector * RKSPI_SECT_LEN * 2 + RKSPI_SECT_LEN,
  44                        '\0', RKSPI_SECT_LEN);
  45         }
  46 }
  47
  48 static int rkspi_check_image_type(uint8_t type)
  49 {
  50         if (type == IH_TYPE_RKSPI)
  51                 return EXIT_SUCCESS;
  52         else
  53                 return EXIT_FAILURE;
  54 }
  55
  56 /*
  57  * The SPI payload needs to make space for odd half-sector layout used in flash
  58  * (i.e. only the first 2K of each 4K sector is used).
  59  */
  60 static int rkspi_vrec_header(struct image_tool_params *params,
  61                              struct image_type_params *tparams)
  62 {
  63         rkcommon_vrec_header(params, tparams);
  64
  65         /*
  66          * Converting to the SPI format (i.e. splitting each 4K page into two
  67          * 2K subpages and then padding these 2K pages up to take a complete
  68          * 4K sector again) which will double the image size.
  69          */
  70         params->file_size = ROUND(params->file_size, RKSPI_SECT_LEN) << 1;
  71
  72         /* Ignoring pad len, since we are using our own copy_image() */
  73         return 0;
  74 }
  75
  76 /*
  77  * rk_spi parameters
  78  */
  79 U_BOOT_IMAGE_TYPE(
  80         rkspi,
  81         "Rockchip SPI Boot Image support",
  82         0,
  83         NULL,
  84         rkcommon_check_params,
  85         rkcommon_verify_header,
  86         rkcommon_print_header,
  87         rkspi_set_header,
  88         NULL,
  89         rkspi_check_image_type,
  90         NULL,
  91         rkspi_vrec_header
  92 );