The default storage location for bootcount is EVT0. This version uses one 32bit value and combines the magic/count value in the upper/lower 16bits. If there is demand for more, should be easy to do.
Signed-off-by: Mike Frysinger vapier@gentoo.org --- arch/blackfin/cpu/Makefile | 1 + arch/blackfin/cpu/bootcount.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+), 0 deletions(-) create mode 100644 arch/blackfin/cpu/bootcount.c
diff --git a/arch/blackfin/cpu/Makefile b/arch/blackfin/cpu/Makefile index 211b8d5..50c1eea 100644 --- a/arch/blackfin/cpu/Makefile +++ b/arch/blackfin/cpu/Makefile @@ -17,6 +17,7 @@ EXTRA := CEXTRA := initcode.o SEXTRA := start.o SOBJS := interrupt.o cache.o +COBJS-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount.o COBJS-y += cpu.o COBJS-y += interrupts.o COBJS-$(CONFIG_JTAG_CONSOLE) += jtag-console.o diff --git a/arch/blackfin/cpu/bootcount.c b/arch/blackfin/cpu/bootcount.c new file mode 100644 index 0000000..6cf6dd5 --- /dev/null +++ b/arch/blackfin/cpu/bootcount.c @@ -0,0 +1,34 @@ +/* + * 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; +}