LXR uboot/drivers/bootcount/bootcount

   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 */
  14void 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
  22ulong 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}
  32