u-boot/drivers/bootcount/bootcount_at91.c
Marek Vasut 758694ff07 bootcount: Make bootcount magic configurable
Add new Kconfig option, SYS_BOOTCOUNT_MAGIC, to select the boot
counter magic word. This can be useful ie. in case the entire
boot counter register is not usable.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
2018-10-19 14:16:43 -04:00

30 lines
774 B
C

// SPDX-License-Identifier: GPL-2.0+
#include <common.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_gpbr.h>
/*
* We combine the CONFIG_SYS_BOOTCOUNT_MAGIC and bootcount in one 32-bit
* register. This is done so we need to use only one of the four GPBR
* registers.
*/
void bootcount_store(ulong a)
{
at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
writel((CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
}
ulong bootcount_load(void)
{
at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
if ((val & 0xffff0000) != (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000))
return 0;
else
return val & 0x0000ffff;
}