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[u-boot] / drivers / bootcount / bootcount_davinci.c
1 /*
2  * (C) Copyright 2011
3  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4  *
5  * A bootcount driver for the RTC IP block found on many TI platforms.
6  * This requires the RTC clocks, etc, to be enabled prior to use and
7  * not all boards with this IP block on it will have the RTC in use.
8  *
9  * SPDX-License-Identifier:     GPL-2.0+
10  */
11
12 #include <bootcount.h>
13 #include <asm/davinci_rtc.h>
14
15 void bootcount_store(ulong a)
16 {
17         struct davinci_rtc *reg =
18                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
19
20         /*
21          * write RTC kick register to enable write
22          * for RTC Scratch registers. Scratch0 and 1 are
23          * used for bootcount values.
24          */
25         writel(RTC_KICK0R_WE, &reg->kick0r);
26         writel(RTC_KICK1R_WE, &reg->kick1r);
27         raw_bootcount_store(&reg->scratch2,
28                             (BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff));
29 }
30
31 ulong bootcount_load(void)
32 {
33         unsigned long val;
34         struct davinci_rtc *reg =
35                 (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
36
37         val = raw_bootcount_load(&reg->scratch2);
38         if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
39                 return 0;
40         else
41                 return val & 0x0000ffff;
42 }