LXR uboot/arch/blackfin/cpu/bootcount.c

   1/*
   2 * functions for handling bootcount support
   3 *
   4 * Copyright (c) 2010 Analog Devices Inc.
   5 *
   6 * Licensed under the 2-clause BSD.
   7 */
   8
   9/* This version uses one 32bit storage and combines the magic/count */
  10
  11#include <common.h>
  12
  13/* We abuse the EVT0 MMR for bootcount storage by default */
  14#ifndef CONFIG_SYS_BOOTCOUNT_ADDR
  15# define CONFIG_SYS_BOOTCOUNT_ADDR EVT0
  16#endif
  17
  18#define MAGIC_MASK 0xffff0000
  19#define COUNT_MASK 0x0000ffff
  20
  21void bootcount_store(ulong cnt)
  22{
  23        ulong magic = (BOOTCOUNT_MAGIC & MAGIC_MASK) | (cnt & COUNT_MASK);
  24        bfin_write32(CONFIG_SYS_BOOTCOUNT_ADDR, magic);
  25}
  26
  27ulong bootcount_load(void)
  28{
  29        ulong magic = bfin_read32(CONFIG_SYS_BOOTCOUNT_ADDR);
  30        if ((magic & MAGIC_MASK) == (BOOTCOUNT_MAGIC & MAGIC_MASK))
  31                return magic & COUNT_MASK;
  32        else
  33                return 0;
  34}
  35