drivers/bootcount/bootcount_ext.c

   1 /*
   2  * Copyright (c) 2017 General Electric Company. All rights reserved.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <bootcount.h>
   8 #include <fs.h>
   9 #include <mapmem.h>
  10
  11 #define BC_MAGIC        0xbc
  12
  13 void bootcount_store(ulong a)
  14 {
  15         u8 *buf;
  16         loff_t len;
  17         int ret;
  18
  19         if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
  20                            CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
  21                 puts("Error selecting device\n");
  22                 return;
  23         }
  24
  25         buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
  26         buf[0] = BC_MAGIC;
  27         buf[1] = (a & 0xff);
  28         unmap_sysmem(buf);
  29
  30         ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
  31                        CONFIG_SYS_BOOTCOUNT_ADDR, 0, 2, &len);
  32         if (ret != 0)
  33                 puts("Error storing bootcount\n");
  34 }
  35
  36 ulong bootcount_load(void)
  37 {
  38         u8 *buf;
  39         loff_t len_read;
  40         int ret;
  41
  42         if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
  43                            CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
  44                 puts("Error selecting device\n");
  45                 return 0;
  46         }
  47
  48         ret = fs_read(CONFIG_SYS_BOOTCOUNT_EXT_NAME, CONFIG_SYS_BOOTCOUNT_ADDR,
  49                       0, 2, &len_read);
  50         if (ret != 0 || len_read != 2) {
  51                 puts("Error loading bootcount\n");
  52                 return 0;
  53         }
  54
  55         buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
  56         if (buf[0] == BC_MAGIC)
  57                 ret = buf[1];
  58
  59         unmap_sysmem(buf);
  60
  61         return ret;
  62 }