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Blackfin: implement bootcount support

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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>
This commit is contained in:
Mike Frysinger 2010-04-29 01:34:57 -04:00
parent 66a4909a3d
commit a5384ae49a
2 changed files with 35 additions and 0 deletions
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1
arch/blackfin/cpu/Makefile
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@ -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

34
arch/blackfin/cpu/bootcount.c Normal file
View File

@ -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;
}