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[v2,0/4] crypto: atmel-sha204a - read out otp zone

Message ID 20240503211054.1231-1-l.rubusch@gmail.com (mailing list archive)
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Series crypto: atmel-sha204a - read out otp zone | expand

Message

Lothar Rubusch May 3, 2024, 9:10 p.m. UTC
Read out otp memory zone of this secure eeprom and rng chip. The chip
has an otp zone and data zone, both still not accessed. The otp zone
can be used to store persistently serial numbers or similar, if externally
pre-configured. In any way the Atmel SHA204a needs to be preconfgured and
fuse locked in order to be useful also for the already implemented RNG
functionality. Placing data into the otp zone is optional. If empty, the
chip returns 0xff on all field. The implementation passes the content to
a new sysfs handle to userspace. If the chip is locked or not accessible
no sysfs handle is set.

Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
---
v1 -> v2
- fix typo in commit title
- drop patch: remove unused includes

Lothar Rubusch (4):
  crypto: atmel-i2c - add missing arg description
  crypto: atmel-i2c - rename read function
  crypto: atmel-sha204a - add reading from otp zone
  crypto: atmel-sha204a - provide the otp content

 drivers/crypto/atmel-i2c.c     | 30 +++++++++++++--
 drivers/crypto/atmel-i2c.h     |  8 +++-
 drivers/crypto/atmel-sha204a.c | 68 ++++++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+), 4 deletions(-)

Comments

Herbert Xu May 10, 2024, 9:23 a.m. UTC | #1
On Fri, May 03, 2024 at 09:10:50PM +0000, Lothar Rubusch wrote:
> Read out otp memory zone of this secure eeprom and rng chip. The chip
> has an otp zone and data zone, both still not accessed. The otp zone
> can be used to store persistently serial numbers or similar, if externally
> pre-configured. In any way the Atmel SHA204a needs to be preconfgured and
> fuse locked in order to be useful also for the already implemented RNG
> functionality. Placing data into the otp zone is optional. If empty, the
> chip returns 0xff on all field. The implementation passes the content to
> a new sysfs handle to userspace. If the chip is locked or not accessible
> no sysfs handle is set.
> 
> Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
> ---
> v1 -> v2
> - fix typo in commit title
> - drop patch: remove unused includes
> 
> Lothar Rubusch (4):
>   crypto: atmel-i2c - add missing arg description
>   crypto: atmel-i2c - rename read function
>   crypto: atmel-sha204a - add reading from otp zone
>   crypto: atmel-sha204a - provide the otp content
> 
>  drivers/crypto/atmel-i2c.c     | 30 +++++++++++++--
>  drivers/crypto/atmel-i2c.h     |  8 +++-
>  drivers/crypto/atmel-sha204a.c | 68 ++++++++++++++++++++++++++++++++++
>  3 files changed, 102 insertions(+), 4 deletions(-)
> 
> -- 
> 2.25.1

All applied.  Thanks.