u-boot/arch/arm/mach-at91/include/mach/at91_gpbr.h
Masahiro Yamada af93082760 ARM: at91: move SoC headers to mach-at91/include/mach
Move arch/arm/include/asm/arch-at91/*
  -> arch/arm/mach-at91/include/mach/*

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Andreas Bießmann <andreas.devel@googlemail.com>
2015-02-21 08:23:52 -05:00

42 lines
991 B
C

/*
* Copyright (C) 2010
* Reinhard Meyer, reinhard.meyer@emk-elektronik.de
*
* General Purpose Backup Registers
* Based on AT91SAM9XE datasheet
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef AT91_GPBR_H
#define AT91_GPBR_H
/*
* The Atmel AT91SAM9 series has a small resource of 4 nonvolatile
* 32 Bit registers (buffered by the Vbu power).
*
* Please consider carefully before using this resource for tasks
* that do not really need nonvolatile registers. Maybe you can
* store information in EEPROM or FLASH instead.
*
* However, if you use a GPBR please document its use here and
* reference the define in your code!
*
* known typical uses of the GPBRs:
* GPBR[0]: offset for RTT timekeeping (u-boot, kernel)
* GPBR[1]: unused
* GPBR[2]: unused
* GPBR[3]: bootcount (u-boot)
*/
#define AT91_GPBR_INDEX_TIMEOFF 0
#define AT91_GPBR_INDEX_BOOTCOUNT 3
#ifndef __ASSEMBLY__
typedef struct at91_gpbr {
u32 reg[4];
} at91_gpbr_t;
#endif /* __ASSEMBLY__ */
#endif