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

/*
 * functions for handling bootcount support
 *
 * Copyright (c) 2010 Analog Devices Inc.
 *
 * Licensed under the 2-clause BSD.
 */

/* This version uses one 32bit storage and combines the magic/count */

#include <common.h>

/* We abuse the EVT0 MMR for bootcount storage by default */
#ifndef CONFIG_SYS_BOOTCOUNT_ADDR
# define CONFIG_SYS_BOOTCOUNT_ADDR EVT0
#endif

#define MAGIC_MASK 0xffff0000
#define COUNT_MASK 0x0000ffff

void bootcount_store(ulong cnt)
{
	ulong magic = (BOOTCOUNT_MAGIC & MAGIC_MASK) | (cnt & COUNT_MASK);
	bfin_write32(CONFIG_SYS_BOOTCOUNT_ADDR, magic);
}

ulong bootcount_load(void)
{
	ulong magic = bfin_read32(CONFIG_SYS_BOOTCOUNT_ADDR);
	if ((magic & MAGIC_MASK) == (BOOTCOUNT_MAGIC & MAGIC_MASK))
		return magic & COUNT_MASK;
	else
		return 0;
}
Commit	Line	Data
a5384ae4 MF	1	/*
	2	* functions for handling bootcount support
	3	*
	4	* Copyright (c) 2010 Analog Devices Inc.
	5	*
	6	* Licensed under the 2-clause BSD.
	7	*/
	8
	9	/* This version uses one 32bit storage and combines the magic/count */
	10
	11	#include <common.h>
	12
	13	/* We abuse the EVT0 MMR for bootcount storage by default */
	14	#ifndef CONFIG_SYS_BOOTCOUNT_ADDR
	15	# define CONFIG_SYS_BOOTCOUNT_ADDR EVT0
	16	#endif
	17
	18	#define MAGIC_MASK 0xffff0000
	19	#define COUNT_MASK 0x0000ffff
	20
	21	void bootcount_store(ulong cnt)
	22	{
	23	ulong magic = (BOOTCOUNT_MAGIC & MAGIC_MASK) \| (cnt & COUNT_MASK);
	24	bfin_write32(CONFIG_SYS_BOOTCOUNT_ADDR, magic);
	25	}
	26
	27	ulong bootcount_load(void)
	28	{
	29	ulong magic = bfin_read32(CONFIG_SYS_BOOTCOUNT_ADDR);
	30	if ((magic & MAGIC_MASK) == (BOOTCOUNT_MAGIC & MAGIC_MASK))
	31	return magic & COUNT_MASK;
	32	else
	33	return 0;
	34	}