[PATCH 0/2] v3 Driver for Allwinner sunxi Security ID

Oliver Schinagl
2013-06-14T23:16:19Z

From: Oliver Schinagl <oliver@schinagl.nl>

I've tried to incoperate all requests/issues but as always could have possibly
missed some. I've talked to a few people, maxime mostly about the return vs
goto and he said it was up to me, and have choosen to stick with the goto for
the error handling.

Changes from v2:
* Removed the global pointer, we can change that when the need for external
access arises
* Fixed header inclusions
* Corrected if guards. There where some crude mistakes there
* Changed offset to an unsigned int so we don't have to worry about negatives
* Cleaned up variable declarations
* Changed ret value, ENXIO (No device/io) as that better matches a missing dt
* Made the loading informercial print version so it is somewhat usefull

Changes from v1:
* Renamed the sys-fs exported key to eeprom, since it really a read-only eeprom
* Removed mention of sun[67]i since we haven't tested those
* Fixed up mistakes in comments
* Removed PAGE_SIZE references, since this is a binary only driver
* Removed lookup table and calculate offsets better
* Use proper endianess
* Add the SID to seed the kernel entropy pool
* Rewrite probe to use platform_get_resource/devm_ioremap_resource instead

The Allwinner A-series of SoC's have efuses exposed via registers to read the
factory programmed e-fuses. These should in theory be programmable but this is
still to be confirmed. It does appear that these fuses are unique enough to be
used as serial numbers, RSA keys, generate MAC addresses from etc. If it turns
out to be user programmable, the use obviously increases. Allwinner did use the
fuses initially to determine the chip-type.

This driver supports all currently known chips based on datasheets and 'dumped'
drivers that we have so far, the dts is only implemented for known chips.

It has been tested on a Cubieboard 1

This is my very first driver so please try to be gentle

Oliver Schinagl (2):
Initial support for Allwinner's Security ID fuses
Add sunxi-sid to dts for sun4i and sun5i

arch/arm/boot/dts/sun4i-a10.dtsi | 5 ++
arch/arm/boot/dts/sun5i-a13.dtsi | 5 ++
drivers/misc/eeprom/Kconfig | 17 ++++
drivers/misc/eeprom/Makefile | 1 +
drivers/misc/eeprom/sunxi_sid.c | 167 +++++++++++++++++++++++++++++++++++++++
5 files changed, 195 insertions(+)
create mode 100644 drivers/misc/eeprom/sunxi_sid.c

--
1.8.1.5