LXR uboot/drivers/bootcount/bootcount

   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 */
  13void 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
  21ulong 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}
  31