[u-boot.git] / drivers / bootcount / bootcount_at91.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 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((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) != (BOOTCOUNT_MAGIC & 0xffff0000))
		return 0;
	else
		return val & 0x0000ffff;
}
Commit	Line	Data
0044c42e	1	/*
1a459660	2	* SPDX-License-Identifier: GPL-2.0+
0044c42e SR	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	}