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path: root/drivers/bootcount/bootcount_ram.c
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Diffstat (limited to 'drivers/bootcount/bootcount_ram.c')
-rw-r--r--drivers/bootcount/bootcount_ram.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/bootcount/bootcount_ram.c b/drivers/bootcount/bootcount_ram.c
new file mode 100644
index 0000000..8655af7
--- /dev/null
+++ b/drivers/bootcount/bootcount_ram.c
@@ -0,0 +1,72 @@
+/*
+ * (C) Copyright 2010
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+const ulong patterns[] = { 0x00000000,
+ 0xFFFFFFFF,
+ 0xFF00FF00,
+ 0x0F0F0F0F,
+ 0xF0F0F0F0};
+const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
+const ulong OFFS_PATTERN = 3;
+const ulong REPEAT_PATTERN = 1000;
+
+void bootcount_store(ulong a)
+{
+ ulong *save_addr;
+ ulong size = 0;
+ int i;
+
+ for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
+ size += gd->bd->bi_dram[i].size;
+ save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
+ writel(a, save_addr);
+ writel(BOOTCOUNT_MAGIC, &save_addr[1]);
+
+ for (i = 0; i < REPEAT_PATTERN; i++)
+ writel(patterns[i % NBR_OF_PATTERNS],
+ &save_addr[i + OFFS_PATTERN]);
+
+}
+
+ulong bootcount_load(void)
+{
+ ulong *save_addr;
+ ulong size = 0;
+ ulong counter = 0;
+ int i, tmp;
+
+ for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
+ size += gd->bd->bi_dram[i].size;
+ save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
+
+ counter = readl(&save_addr[0]);
+
+ /* Is the counter reliable, check in the big pattern for bit errors */
+ for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
+ tmp = readl(&save_addr[i + OFFS_PATTERN]);
+ if (tmp != patterns[i % NBR_OF_PATTERNS])
+ counter = 0;
+ }
+ return counter;
+}