This adds a hook at common late init to extract the 64 bits of
chip-unique data and throw it into the entropy pool to make it
more device-unique.
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
Stephen: since I don't have the Tegra reference manual I don't
know what "UID" means, but if it means "unique ID" then this
patch should be relevant for initializing the entropy pool.
---
arch/arm/mach-tegra/common.c | 1 +
arch/arm/mach-tegra/fuse.c | 9 +++++++++
arch/arm/mach-tegra/fuse.h | 1 +
3 files changed, 11 insertions(+)
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 94a119a..c1ab5f5 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -109,6 +109,7 @@ void __init tegra_init_early(void)
void __init tegra_init_late(void)
{
+ tegra_random_init();
tegra_init_suspend();
tegra_cpuidle_init();
tegra_powergate_debugfs_init();
diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index e035cd2..16673de 100644
--- a/arch/arm/mach-tegra/fuse.c
+++ b/arch/arm/mach-tegra/fuse.c
@@ -22,6 +22,7 @@
#include <linux/io.h>
#include <linux/export.h>
#include <linux/tegra-soc.h>
+#include <linux/random.h>
#include "fuse.h"
#include "iomap.h"
@@ -165,3 +166,11 @@ unsigned long long tegra_chip_uid(void)
return (hi << 32ull) | lo;
}
EXPORT_SYMBOL(tegra_chip_uid);
+
+void __init tegra_random_init(void)
+{
+ unsigned long long uid;
+
+ uid = tegra_chip_uid();
+ add_device_randomness(&uid, sizeof(uid));
+}
diff --git a/arch/arm/mach-tegra/fuse.h b/arch/arm/mach-tegra/fuse.h
index def7968..559d101 100644
--- a/arch/arm/mach-tegra/fuse.h
+++ b/arch/arm/mach-tegra/fuse.h
@@ -55,6 +55,7 @@ unsigned long long tegra_chip_uid(void);
void tegra_init_fuse(void);
bool tegra_spare_fuse(int bit);
u32 tegra_fuse_readl(unsigned long offset);
+void tegra_random_init(void);
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
void tegra20_init_speedo_data(void);
--
1.8.3.1
--
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