arch/arm/imx-common/cmd_dek.c

   1 /*
   2  * Copyright 2008-2015 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier: GPL-2.0+
   5  *
   6  * Command for encapsulating DEK blob
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <environment.h>
  12 #include <malloc.h>
  13 #include <asm/byteorder.h>
  14 #include <linux/compiler.h>
  15 #include <fsl_sec.h>
  16 #include <asm/arch/clock.h>
  17 #include <mapmem.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 /**
  22 * blob_dek() - Encapsulate the DEK as a blob using CAM's Key
  23 * @src: - Address of data to be encapsulated
  24 * @dst: - Desination address of encapsulated data
  25 * @len: - Size of data to be encapsulated
  26 *
  27 * Returns zero on success,and negative on error.
  28 */
  29 static int blob_encap_dek(const u8 *src, u8 *dst, u32 len)
  30 {
  31         int ret = 0;
  32         u32 jr_size = 4;
  33
  34         u32 out_jr_size = sec_in32(CONFIG_SYS_FSL_JR0_ADDR + 0x102c);
  35         if (out_jr_size != jr_size) {
  36                 hab_caam_clock_enable(1);
  37                 sec_init();
  38         }
  39
  40         if (!((len == 128) | (len == 192) | (len == 256))) {
  41                 debug("Invalid DEK size. Valid sizes are 128, 192 and 256b\n");
  42                 return -1;
  43         }
  44
  45         len /= 8;
  46         ret = blob_dek(src, dst, len);
  47
  48         return ret;
  49 }
  50
  51 /**
  52  * do_dek_blob() - Handle the "dek_blob" command-line command
  53  * @cmdtp:  Command data struct pointer
  54  * @flag:   Command flag
  55  * @argc:   Command-line argument count
  56  * @argv:   Array of command-line arguments
  57  *
  58  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
  59  * on error.
  60  */
  61 static int do_dek_blob(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  62 {
  63         uint32_t src_addr, dst_addr, len;
  64         uint8_t *src_ptr, *dst_ptr;
  65         int ret = 0;
  66
  67         if (argc != 4)
  68                 return CMD_RET_USAGE;
  69
  70         src_addr = simple_strtoul(argv[1], NULL, 16);
  71         dst_addr = simple_strtoul(argv[2], NULL, 16);
  72         len = simple_strtoul(argv[3], NULL, 10);
  73
  74         src_ptr = map_sysmem(src_addr, len/8);
  75         dst_ptr = map_sysmem(dst_addr, BLOB_SIZE(len/8));
  76
  77         ret = blob_encap_dek(src_ptr, dst_ptr, len);
  78
  79         return ret;
  80 }
  81
  82 /***************************************************/
  83 static char dek_blob_help_text[] =
  84         "src dst len            - Encapsulate and create blob of data\n"
  85         "                         $len bits long at address $src and\n"
  86         "                         store the result at address $dst.\n";
  87
  88 U_BOOT_CMD(
  89         dek_blob, 4, 1, do_dek_blob,
  90         "Data Encryption Key blob encapsulation",
  91         dek_blob_help_text
  92 );