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- // 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;
- }
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