drivers/bootcount/bootcount_davinci.c

   1 /*
   2  * (C) Copyright 2011
   3  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <bootcount.h>
   9 #include <asm/arch/da850_lowlevel.h>
  10 #include <asm/arch/davinci_misc.h>
  11
  12 void bootcount_store(ulong a)
  13 {
  14         struct davinci_rtc *reg =
  15                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
  16
  17         /*
  18          * write RTC kick register to enable write
  19          * for RTC Scratch registers. Scratch0 and 1 are
  20          * used for bootcount values.
  21          */
  22         writel(RTC_KICK0R_WE, &reg->kick0r);
  23         writel(RTC_KICK1R_WE, &reg->kick1r);
  24         raw_bootcount_store(&reg->scratch0, a);
  25         raw_bootcount_store(&reg->scratch1, BOOTCOUNT_MAGIC);
  26 }
  27
  28 ulong bootcount_load(void)
  29 {
  30         struct davinci_rtc *reg =
  31                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
  32
  33         if (raw_bootcount_load(&reg->scratch1) != BOOTCOUNT_MAGIC)
  34                 return 0;
  35         else
  36                 return raw_bootcount_load(&reg->scratch0);
  37 }