[ARM] tegra: kfuse driver

factory programmed encrypted key fuses held in kfuse module.
use APB DMA for accessing kfuse registers, reading directly can hang if any
other DMA is active.

Change-Id: I85e44cc169607bc22116075e28938014aa299d75
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
Tested-by: Jon Mayo <jmayo@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Signed-off-by: Jon Mayo <jmayo@nvidia.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/include/mach/kfuse.h b/arch/arm/mach-tegra/include/mach/kfuse.h
new file mode 100644
index 000000000000..cfe85cc86ff2
--- /dev/null
+++ b/arch/arm/mach-tegra/include/mach/kfuse.h
@@ -0,0 +1,20 @@
+/*
+ * arch/arm/mach-tegra/kfuse.h
+ *
+ * Copyright (C) 2010-2011 NVIDIA Corporation.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+/* there are 144 32-bit values in total */
+#define KFUSE_DATA_SZ (144 * 4)
+
+int tegra_kfuse_read(void *dest, size_t len);