1 /*
2  * (C) Copyright 2011
3  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  */
19 
20 #include <bootcount.h>
21 #include <asm/arch/da850_lowlevel.h>
22 #include <asm/arch/davinci_misc.h>
23 
24 void bootcount_store(ulong a)
25 {
26 	struct davinci_rtc *reg =
27 		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
28 
29 	/*
30 	 * write RTC kick register to enable write
31 	 * for RTC Scratch registers. Scratch0 and 1 are
32 	 * used for bootcount values.
33 	 */
34 	writel(RTC_KICK0R_WE, &reg->kick0r);
35 	writel(RTC_KICK1R_WE, &reg->kick1r);
36 	raw_bootcount_store(&reg->scratch0, a);
37 	raw_bootcount_store(&reg->scratch1, BOOTCOUNT_MAGIC);
38 }
39 
40 ulong bootcount_load(void)
41 {
42 	struct davinci_rtc *reg =
43 		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
44 
45 	if (raw_bootcount_load(&reg->scratch1) != BOOTCOUNT_MAGIC)
46 		return 0;
47 	else
48 		return raw_bootcount_load(&reg->scratch0);
49 }
50