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