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 BOOTCOUNT_MAGIC and bootcount in one 32-bit register.
10  * This is done so we need to use only one of the four GPBR registers.
11  */
12 void bootcount_store(ulong a)
13 {
14 	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
15 
16 	writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
17 		&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
18 }
19 
20 ulong bootcount_load(void)
21 {
22 	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
23 
24 	ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
25 	if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
26 		return 0;
27 	else
28 		return val & 0x0000ffff;
29 }
30