[J-u-boot.git] / drivers / bootcount / bootcount_i2c.c

/*
 * (C) Copyright 2013
 * Heiko Schocher, DENX Software Engineering, [email protected].
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <bootcount.h>
#include <linux/compiler.h>
#include <i2c.h>

#define BC_MAGIC	0xbc

void bootcount_store(ulong a)
{
	unsigned char buf[3];
	int ret;

	buf[0] = BC_MAGIC;
	buf[1] = (a & 0xff);
	ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
		  CONFIG_BOOTCOUNT_ALEN, buf, 2);
	if (ret != 0)
		puts("Error writing bootcount\n");
}

ulong bootcount_load(void)
{
	unsigned char buf[3];
	int ret;

	ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
		       CONFIG_BOOTCOUNT_ALEN, buf, 2);
	if (ret != 0) {
		puts("Error loading bootcount\n");
		return 0;
	}
	if (buf[0] == BC_MAGIC)
		return buf[1];

	bootcount_store(0);

	return 0;
}
Commit	Line	Data
9e50c406 HS	1	/*
	2	* (C) Copyright 2013
	3	* Heiko Schocher, DENX Software Engineering, [email protected].
	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
	14	void 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
	27	ulong 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	}