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 int rkspi_verify_header(unsigned char *buf, int size,
  21                                struct image_tool_params *params)
  22 {
  23         return 0;
  24 }
  25
  26 static void rkspi_print_header(const void *buf)
  27 {
  28 }
  29
  30 static void rkspi_set_header(void *buf, struct stat *sbuf, int ifd,
  31                              struct image_tool_params *params)
  32 {
  33         int sector;
  34         unsigned int size;
  35         int ret;
  36
  37         size = params->orig_file_size;
  38         ret = rkcommon_set_header(buf, size, params);
  39         debug("size %x\n", size);
  40         if (ret) {
  41                 /* TODO(sjg@chromium.org): This method should return an error */
  42                 printf("Warning: SPL image is too large (size %#x) and will "
  43                        "not boot\n", size);
  44         }
  45
  46         /*
  47          * Spread the image out so we only use the first 2KB of each 4KB
  48          * region. This is a feature of the SPI format required by the Rockchip
  49          * boot ROM. Its rationale is unknown.
  50          */
  51         for (sector = size / RKSPI_SECT_LEN - 1; sector >= 0; sector--) {
  52                 debug("sector %u\n", sector);
  53                 memmove(buf + sector * RKSPI_SECT_LEN * 2,
  54                         buf + sector * RKSPI_SECT_LEN,
  55                         RKSPI_SECT_LEN);
  56                 memset(buf + sector * RKSPI_SECT_LEN * 2 + RKSPI_SECT_LEN,
  57                        '\0', RKSPI_SECT_LEN);
  58         }
  59 }
  60
  61 static int rkspi_extract_subimage(void *buf, struct image_tool_params *params)
  62 {
  63         return 0;
  64 }
  65
  66 static int rkspi_check_image_type(uint8_t type)
  67 {
  68         if (type == IH_TYPE_RKSPI)
  69                 return EXIT_SUCCESS;
  70         else
  71                 return EXIT_FAILURE;
  72 }
  73
  74 /*
  75  * The SPI payload needs to be padded out to make space for odd half-sector
  76  * layout used in flash (i.e. only the first 2K of each 4K sector is used).
  77  */
  78 static int rkspi_vrec_header(struct image_tool_params *params,
  79                              struct image_type_params *tparams)
  80 {
  81         int padding = rkcommon_vrec_header(params, tparams, 2048);
  82         /*
  83          * The file size has not been adjusted at this point (our caller will
  84          * eventually add the header/padding to the file_size), so we need to
  85          * add up the header_size, file_size and padding ourselves.
  86          */
  87         int padded_size = tparams->header_size + params->file_size + padding;
  88
  89         /*
  90          * We need to store the original file-size (i.e. before padding), as
  91          * imagetool does not set this during its adjustment of file_size.
  92          */
  93         params->orig_file_size = padded_size;
  94
  95         /*
  96          * Converting to the SPI format (i.e. splitting each 4K page into two
  97          * 2K subpages and then padding these 2K pages up to take a complete
  98          * 4K sector again) will will double the image size.
  99          *
 100          * Thus we return the padded_size as an additional padding requirement
 101          * (be sure to add this to the padding returned from the common code).
 102          */
 103         return padded_size + padding;
 104 }
 105
 106 /*
 107  * rk_spi parameters
 108  */
 109 U_BOOT_IMAGE_TYPE(
 110         rkspi,
 111         "Rockchip SPI Boot Image support",
 112         0,
 113         NULL,
 114         rkcommon_check_params,
 115         rkspi_verify_header,
 116         rkspi_print_header,
 117         rkspi_set_header,
 118         rkspi_extract_subimage,
 119         rkspi_check_image_type,
 120         NULL,
 121         rkspi_vrec_header
 122 );