mirror of
https://github.com/AsahiLinux/u-boot
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35 lines
781 B
C
35 lines
781 B
C
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/*
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* functions for handling bootcount support
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*
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* Copyright (c) 2010 Analog Devices Inc.
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*
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* Licensed under the 2-clause BSD.
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*/
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/* This version uses one 32bit storage and combines the magic/count */
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#include <common.h>
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/* We abuse the EVT0 MMR for bootcount storage by default */
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#ifndef CONFIG_SYS_BOOTCOUNT_ADDR
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# define CONFIG_SYS_BOOTCOUNT_ADDR EVT0
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#endif
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#define MAGIC_MASK 0xffff0000
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#define COUNT_MASK 0x0000ffff
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void bootcount_store(ulong cnt)
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{
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ulong magic = (BOOTCOUNT_MAGIC & MAGIC_MASK) | (cnt & COUNT_MASK);
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bfin_write32(CONFIG_SYS_BOOTCOUNT_ADDR, magic);
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}
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ulong bootcount_load(void)
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{
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ulong magic = bfin_read32(CONFIG_SYS_BOOTCOUNT_ADDR);
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if ((magic & MAGIC_MASK) == (BOOTCOUNT_MAGIC & MAGIC_MASK))
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return magic & COUNT_MASK;
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else
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return 0;
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}
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