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/davinci_rtc.h>
  10
  11 void bootcount_store(ulong a)
  12 {
  13         struct davinci_rtc *reg =
  14                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
  15
  16         /*
  17          * write RTC kick register to enable write
  18          * for RTC Scratch registers. Scratch0 and 1 are
  19          * used for bootcount values.
  20          */
  21         writel(RTC_KICK0R_WE, &reg->kick0r);
  22         writel(RTC_KICK1R_WE, &reg->kick1r);
  23         raw_bootcount_store(&reg->scratch2,
  24                             (BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff));
  25 }
  26
  27 ulong bootcount_load(void)
  28 {
  29         unsigned long val;
  30         struct davinci_rtc *reg =
  31                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
  32
  33         val = raw_bootcount_load(&reg->scratch2);
  34         if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
  35                 return 0;
  36         else
  37                 return val & 0x0000ffff;
  38 }