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  */
bootcount_store(ulong a)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 
bootcount_load(void)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 }
31