mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 02:38:56 +00:00
758694ff07
Add new Kconfig option, SYS_BOOTCOUNT_MAGIC, to select the boot counter magic word. This can be useful ie. in case the entire boot counter register is not usable. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Tom Rini <trini@konsulko.com>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (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.
|
|
*/
|
|
|
|
#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,
|
|
(CONFIG_SYS_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) != (CONFIG_SYS_BOOTCOUNT_MAGIC & 0xffff0000))
|
|
return 0;
|
|
else
|
|
return val & 0x0000ffff;
|
|
}
|