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arm: imx6ul: Add Engicam GEAM6UL Starter Kit initial support
[u-boot] / drivers / bootcount / bootcount_at91.c
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  */
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 }