Changes from v3:
* Cleanup comments
* Remove last byte masking and useless casting, the C standard guarntees
we are ok
* Removed some complexity from sid_read, thanks to Russel
* Replace dev_info with dev_dbg reducing the verbosity
* Removed driver version
* Reorderd variable declrations based on usage, return value always last
* Removed all goto in exchange for return, due to popular request
* Reduced line count by removing extra lines
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 (1):
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 +++++
2 files changed, 10 insertions(+)
--
1.8.1.5
From: Oliver Schinagl <[email protected]>
This patch shall add support for the sunxi-sid driver to the device table for
sun4i and sun5i.
Signed-off-by: Oliver Schinagl <[email protected]>
---
arch/arm/boot/dts/sun4i-a10.dtsi | 5 +++++
arch/arm/boot/dts/sun5i-a13.dtsi | 5 +++++
2 files changed, 10 insertions(+)
diff --git a/arch/arm/boot/dts/sun4i-a10.dtsi b/arch/arm/boot/dts/sun4i-a10.dtsi
index e7ef619..bc71d64 100644
--- a/arch/arm/boot/dts/sun4i-a10.dtsi
+++ b/arch/arm/boot/dts/sun4i-a10.dtsi
@@ -213,6 +213,11 @@
reg = <0x01c20c90 0x10>;
};
+ sid: eeprom@01c23800 {
+ compatible = "allwinner,sun4i-sid";
+ reg = <0x01c23800 0x10>;
+ };
+
uart0: serial@01c28000 {
compatible = "snps,dw-apb-uart";
reg = <0x01c28000 0x400>;
diff --git a/arch/arm/boot/dts/sun5i-a13.dtsi b/arch/arm/boot/dts/sun5i-a13.dtsi
index 8ba65c1..c80c81b 100644
--- a/arch/arm/boot/dts/sun5i-a13.dtsi
+++ b/arch/arm/boot/dts/sun5i-a13.dtsi
@@ -196,6 +196,11 @@
reg = <0x01c20c90 0x10>;
};
+ sid: eeprom@01c23800 {
+ compatible = "allwinner,sun4i-sid";
+ reg = <0x01c23800 0x10>;
+ };
+
uart1: serial@01c28400 {
compatible = "snps,dw-apb-uart";
reg = <0x01c28400 0x400>;
--
1.8.1.5