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authorAnders Darander <anders.darander@gmail.com>2010-02-25 15:57:03 +0100
committerTom Rix <Tom.Rix@windriver.com>2010-03-07 12:36:35 -0600
commitcade7d9577d4d17f55404b5e60cd5e5b0b605c31 (patch)
tree0c26dc39d34abe034f68a4798ace6b4b8e59d0ff /cpu/arm926ejs
parent5f353484093876d7021f20fa4bd63f82d32941b9 (diff)
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Add bootcount to AT91
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>
Diffstat (limited to 'cpu/arm926ejs')
-rw-r--r--cpu/arm926ejs/at91/cpu.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/cpu/arm926ejs/at91/cpu.c b/cpu/arm926ejs/at91/cpu.c
index 1094f8c..141a7d1 100644
--- a/cpu/arm926ejs/at91/cpu.c
+++ b/cpu/arm926ejs/at91/cpu.c
@@ -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 */