drivers/bootcount/bootcount_at91.c

   1 /*
   2  * SPDX-License-Identifier:     GPL-2.0+
   3  */
   4
   5 #include <common.h>
   6 #include <asm/io.h>
   7 #include <asm/arch/hardware.h>
   8 #include <asm/arch/at91_gpbr.h>
   9
  10 /*
  11  * We combine the BOOTCOUNT_MAGIC and bootcount in one 32-bit register.
  12  * This is done so we need to use only one of the four GPBR registers.
  13  */
  14 void bootcount_store(ulong a)
  15 {
  16         at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
  17
  18         writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
  19                 &gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
  20 }
  21
  22 ulong bootcount_load(void)
  23 {
  24         at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
  25
  26         ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
  27         if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
  28                 return 0;
  29         else
  30                 return val & 0x0000ffff;
  31 }