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41 lines
1.1 KiB
41 lines
1.1 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright 2011 |
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* Heiko Schocher, DENX Software Engineering, [email protected]. |
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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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#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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