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9e50c406c8
add support for bootcounter on an i2c device. And add a README for all bootcounter options. Signed-off-by: Heiko Schocher <hs@denx.de>
45 lines
807 B
C
45 lines
807 B
C
/*
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* (C) Copyright 2013
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* Heiko Schocher, DENX Software Engineering, hs@denx.de.
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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 <linux/compiler.h>
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#include <i2c.h>
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#define BC_MAGIC 0xbc
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void bootcount_store(ulong a)
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{
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unsigned char buf[3];
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int ret;
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buf[0] = BC_MAGIC;
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buf[1] = (a & 0xff);
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ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
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CONFIG_BOOTCOUNT_ALEN, buf, 2);
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if (ret != 0)
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puts("Error writing bootcount\n");
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}
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ulong bootcount_load(void)
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{
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unsigned char buf[3];
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int ret;
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ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
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CONFIG_BOOTCOUNT_ALEN, buf, 2);
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if (ret != 0) {
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puts("Error loading bootcount\n");
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return 0;
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}
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if (buf[0] == BC_MAGIC)
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return buf[1];
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bootcount_store(0);
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return 0;
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}
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