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 void rkspi_set_header(void *buf, struct stat *sbuf, int ifd,
  21                              struct image_tool_params *params)
  22 {
  23         int sector;
  24         unsigned int size;
  25         int ret;
  26
  27         size = params->orig_file_size;
  28         ret = rkcommon_set_header(buf, size, params);
  29         debug("size %x\n", size);
  30         if (ret) {
  31                 /* TODO(sjg@chromium.org): This method should return an error */
  32                 printf("Warning: SPL image is too large (size %#x) and will "
  33                        "not boot\n", size);
  34         }
  35
  36         /*
  37          * Spread the image out so we only use the first 2KB of each 4KB
  38          * region. This is a feature of the SPI format required by the Rockchip
  39          * boot ROM. Its rationale is unknown.
  40          */
  41         for (sector = size / RKSPI_SECT_LEN - 1; sector >= 0; sector--) {
  42                 debug("sector %u\n", sector);
  43                 memmove(buf + sector * RKSPI_SECT_LEN * 2,
  44                         buf + sector * RKSPI_SECT_LEN,
  45                         RKSPI_SECT_LEN);
  46                 memset(buf + sector * RKSPI_SECT_LEN * 2 + RKSPI_SECT_LEN,
  47                        '\0', RKSPI_SECT_LEN);
  48         }
  49 }
  50
  51 static int rkspi_check_image_type(uint8_t type)
  52 {
  53         if (type == IH_TYPE_RKSPI)
  54                 return EXIT_SUCCESS;
  55         else
  56                 return EXIT_FAILURE;
  57 }
  58
  59 /*
  60  * The SPI payload needs to be padded out to make space for odd half-sector
  61  * layout used in flash (i.e. only the first 2K of each 4K sector is used).
  62  */
  63 static int rkspi_vrec_header(struct image_tool_params *params,
  64                              struct image_type_params *tparams)
  65 {
  66         int padding = rkcommon_vrec_header(params, tparams, RK_INIT_SIZE_ALIGN);
  67         /*
  68          * The file size has not been adjusted at this point (our caller will
  69          * eventually add the header/padding to the file_size), so we need to
  70          * add up the header_size, file_size and padding ourselves.
  71          */
  72         int padded_size = tparams->header_size + params->file_size + padding;
  73
  74         /*
  75          * We need to store the original file-size (i.e. before padding), as
  76          * imagetool does not set this during its adjustment of file_size.
  77          */
  78         params->orig_file_size = padded_size;
  79
  80         /*
  81          * Converting to the SPI format (i.e. splitting each 4K page into two
  82          * 2K subpages and then padding these 2K pages up to take a complete
  83          * 4K sector again) will will double the image size.
  84          *
  85          * Thus we return the padded_size as an additional padding requirement
  86          * (be sure to add this to the padding returned from the common code).
  87          */
  88         return padded_size + padding;
  89 }
  90
  91 /*
  92  * rk_spi parameters
  93  */
  94 U_BOOT_IMAGE_TYPE(
  95         rkspi,
  96         "Rockchip SPI Boot Image support",
  97         0,
  98         NULL,
  99         rkcommon_check_params,
 100         rkcommon_verify_header,
 101         rkcommon_print_header,
 102         rkspi_set_header,
 103         NULL,
 104         rkspi_check_image_type,
 105         NULL,
 106         rkspi_vrec_header
 107 );