blob: e27b168c55cc556f5006894d63e284bcc08f654e [file] [log] [blame]
Heiko Schocher9e50c402014-01-25 07:27:13 +01001/*
2 * (C) Copyright 2013
3 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <bootcount.h>
9#include <linux/compiler.h>
10#include <i2c.h>
11
12#define BC_MAGIC 0xbc
13
14void bootcount_store(ulong a)
15{
16 unsigned char buf[3];
17 int ret;
18
19 buf[0] = BC_MAGIC;
20 buf[1] = (a & 0xff);
21 ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
22 CONFIG_BOOTCOUNT_ALEN, buf, 2);
23 if (ret != 0)
24 puts("Error writing bootcount\n");
25}
26
27ulong bootcount_load(void)
28{
29 unsigned char buf[3];
30 int ret;
31
32 ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
33 CONFIG_BOOTCOUNT_ALEN, buf, 2);
34 if (ret != 0) {
35 puts("Error loading bootcount\n");
36 return 0;
37 }
38 if (buf[0] == BC_MAGIC)
39 return buf[1];
40
41 bootcount_store(0);
42
43 return 0;
44}