58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2011
|
|
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
|
|
* (C) Copyright 2018 Robert Bosch Power Tools GmbH.
|
|
*
|
|
* 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>
|
|
|
|
#define BC_VERSION 2
|
|
|
|
void bootcount_store(ulong bootcount)
|
|
{
|
|
u8 upgrade_available = 0;
|
|
ulong val = 0;
|
|
struct davinci_rtc *reg =
|
|
(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
|
|
|
|
val = raw_bootcount_load(®->scratch2);
|
|
upgrade_available = (val >> 8) & 0x000000ff;
|
|
|
|
/* Only update bootcount during upgrade process */
|
|
if (!upgrade_available)
|
|
bootcount = 0;
|
|
|
|
val = (bootcount & 0x000000ff) |
|
|
(upgrade_available << 8) |
|
|
(BC_VERSION << 16) |
|
|
(CONFIG_SYS_BOOTCOUNT_MAGIC << 24);
|
|
|
|
/*
|
|
* 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, val);
|
|
}
|
|
|
|
ulong bootcount_load(void)
|
|
{
|
|
unsigned long val = 0;
|
|
struct davinci_rtc *reg =
|
|
(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
|
|
|
|
val = raw_bootcount_load(®->scratch2);
|
|
if ((val >> 24) != CONFIG_SYS_BOOTCOUNT_MAGIC)
|
|
return 0;
|
|
else
|
|
return val & 0x000000ff;
|
|
}
|