1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * (C) Copyright 2013
3*4882a593Smuzhiyun * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <bootcount.h>
9*4882a593Smuzhiyun #include <linux/compiler.h>
10*4882a593Smuzhiyun #include <i2c.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define BC_MAGIC 0xbc
13*4882a593Smuzhiyun
bootcount_store(ulong a)14*4882a593Smuzhiyun void bootcount_store(ulong a)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun unsigned char buf[3];
17*4882a593Smuzhiyun int ret;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun buf[0] = BC_MAGIC;
20*4882a593Smuzhiyun buf[1] = (a & 0xff);
21*4882a593Smuzhiyun ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
22*4882a593Smuzhiyun CONFIG_BOOTCOUNT_ALEN, buf, 2);
23*4882a593Smuzhiyun if (ret != 0)
24*4882a593Smuzhiyun puts("Error writing bootcount\n");
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
bootcount_load(void)27*4882a593Smuzhiyun ulong bootcount_load(void)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun unsigned char buf[3];
30*4882a593Smuzhiyun int ret;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
33*4882a593Smuzhiyun CONFIG_BOOTCOUNT_ALEN, buf, 2);
34*4882a593Smuzhiyun if (ret != 0) {
35*4882a593Smuzhiyun puts("Error loading bootcount\n");
36*4882a593Smuzhiyun return 0;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun if (buf[0] == BC_MAGIC)
39*4882a593Smuzhiyun return buf[1];
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun bootcount_store(0);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun return 0;
44*4882a593Smuzhiyun }
45