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Add bootcount to AT91

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Use AT91_GPBR 3 as a bootcount register.
The bootmagic and the bootcount shares AT91_GPBR 3.

Signed-off-by: Anders Darander <ad@datarespons.se>
This commit is contained in:
Anders Darander 2010-02-25 15:57:03 +01:00 • committed by Tom Rix
parent 5f35348409
commit cade7d9577
1 changed files with 34 additions and 0 deletions
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34
cpu/arm926ejs/at91/cpu.c
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@ -35,6 +35,13 @@
#define CONFIG_SYS_AT91_MAIN_CLOCK 0
#endif
/*
* The at91sam9260 has 4 GPBR (0-3), we'll use the last one, nr 3,
* to keep track of the bootcount.
*/
#define AT91_GPBR_BOOTCOUNT_REGISTER 3
#define AT91_BOOTCOUNT_ADDRESS (AT91_GPBR + 4*AT91_GPBR_BOOTCOUNT_REGISTER)
int arch_cpu_init(void)
{
return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
@ -56,3 +63,30 @@ int print_cpuinfo(void)
return 0;
}
#endif
#ifdef CONFIG_BOOTCOUNT_LIMIT
/*
* Just as the mpc5xxx, we combine the BOOTCOUNT_MAGIC and boocount
* in one 32-bit register. This is done, as the AT91SAM9260 only has
* 4 GPBR.
*/
void bootcount_store (ulong a)
{
volatile ulong *save_addr =
(volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS);
*save_addr = (BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff);
}
ulong bootcount_load (void)
{
volatile ulong *save_addr =
(volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS);
if ((*save_addr & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
return 0;
else
return (*save_addr & 0x0000ffff);
}
#endif /* CONFIG_BOOTCOUNT_LIMIT */