drivers/bootcount/bootcount_at91.c

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