1234567891011121314151617181920212223242526272829303132333435363738394041 |
- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * Copyright (C) 2010
- * Reinhard Meyer, reinhard.meyer@emk-elektronik.de
- *
- * General Purpose Backup Registers
- * Based on AT91SAM9XE datasheet
- */
- #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
|