drivers/bootcount/bootcount_davinci.c

   1 /*
   2  * (C) Copyright 2011
   3  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #include <bootcount.h>
  21 #include <asm/arch/da850_lowlevel.h>
  22 #include <asm/arch/davinci_misc.h>
  23
  24 void bootcount_store(ulong a)
  25 {
  26         struct davinci_rtc *reg =
  27                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
  28
  29         /*
  30          * write RTC kick register to enable write
  31          * for RTC Scratch registers. Scratch0 and 1 are
  32          * used for bootcount values.
  33          */
  34         writel(RTC_KICK0R_WE, &reg->kick0r);
  35         writel(RTC_KICK1R_WE, &reg->kick1r);
  36         raw_bootcount_store(&reg->scratch0, a);
  37         raw_bootcount_store(&reg->scratch1, BOOTCOUNT_MAGIC);
  38 }
  39
  40 ulong bootcount_load(void)
  41 {
  42         struct davinci_rtc *reg =
  43                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
  44
  45         if (raw_bootcount_load(&reg->scratch1) != BOOTCOUNT_MAGIC)
  46                 return 0;
  47         else
  48                 return raw_bootcount_load(&reg->scratch0);
  49 }