1 /*
2  * (C) Copyright 2011
3  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <bootcount.h>
9 #include <asm/davinci_rtc.h>
10 
11 void bootcount_store(ulong a)
12 {
13 	struct davinci_rtc *reg =
14 		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
15 
16 	/*
17 	 * write RTC kick register to enable write
18 	 * for RTC Scratch registers. Scratch0 and 1 are
19 	 * used for bootcount values.
20 	 */
21 	writel(RTC_KICK0R_WE, &reg->kick0r);
22 	writel(RTC_KICK1R_WE, &reg->kick1r);
23 	raw_bootcount_store(&reg->scratch0, a);
24 	raw_bootcount_store(&reg->scratch1, BOOTCOUNT_MAGIC);
25 }
26 
27 ulong bootcount_load(void)
28 {
29 	struct davinci_rtc *reg =
30 		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
31 
32 	if (raw_bootcount_load(&reg->scratch1) != BOOTCOUNT_MAGIC)
33 		return 0;
34 	else
35 		return raw_bootcount_load(&reg->scratch0);
36 }
37