drivers/bootcount/bootcount_ext.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2017 General Electric Company. All rights reserved.
   4  */
   5
   6 #include <bootcount.h>
   7 #include <fs.h>
   8 #include <mapmem.h>
   9
  10 #define BC_MAGIC        0xbc
  11
  12 void bootcount_store(ulong a)
  13 {
  14         u8 *buf;
  15         loff_t len;
  16         int ret;
  17
  18         if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
  19                            CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
  20                 puts("Error selecting device\n");
  21                 return;
  22         }
  23
  24         buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
  25         buf[0] = BC_MAGIC;
  26         buf[1] = (a & 0xff);
  27         unmap_sysmem(buf);
  28
  29         ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
  30                        CONFIG_SYS_BOOTCOUNT_ADDR, 0, 2, &len);
  31         if (ret != 0)
  32                 puts("Error storing bootcount\n");
  33 }
  34
  35 ulong bootcount_load(void)
  36 {
  37         u8 *buf;
  38         loff_t len_read;
  39         int ret;
  40
  41         if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
  42                            CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
  43                 puts("Error selecting device\n");
  44                 return 0;
  45         }
  46
  47         ret = fs_read(CONFIG_SYS_BOOTCOUNT_EXT_NAME, CONFIG_SYS_BOOTCOUNT_ADDR,
  48                       0, 2, &len_read);
  49         if (ret != 0 || len_read != 2) {
  50                 puts("Error loading bootcount\n");
  51                 return 0;
  52         }
  53
  54         buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
  55         if (buf[0] == BC_MAGIC)
  56                 ret = buf[1];
  57
  58         unmap_sysmem(buf);
  59
  60         return ret;
  61 }