bootcount_davinci.c
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/*
* (C) Copyright 2011
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*
* A bootcount driver for the RTC IP block found on many TI platforms.
* This requires the RTC clocks, etc, to be enabled prior to use and
* not all boards with this IP block on it will have the RTC in use.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <bootcount.h>
#include <asm/davinci_rtc.h>
void bootcount_store(ulong a)
{
struct davinci_rtc *reg =
(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
/*
* write RTC kick registers to enable write
* for RTC Scratch registers. Scratch register 2 is
* used for bootcount value.
*/
writel(RTC_KICK0R_WE, ®->kick0r);
writel(RTC_KICK1R_WE, ®->kick1r);
raw_bootcount_store(®->scratch2,
(BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff));
}
ulong bootcount_load(void)
{
unsigned long val;
struct davinci_rtc *reg =
(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
val = raw_bootcount_load(®->scratch2);
if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
return 0;
else
return val & 0x0000ffff;
}