Re: Nokia N900: omap aes is broken

On Wednesday 18 February 2015 13:21:03 Pali Rohár wrote:

Hello,

I tried to test OMAP AES driver on Nokia N900 with special
Nokia bootloader which enable L3 firewall for OMAP AES HW
support.

I modified arch/arm/boot/dts/omap34xx-hs.dtsi file and
commented aes line which disable aes support in DT.

Then I booted kernel and loaded omap-aes.ko module. And I got
this output in dmesg:

[    0.222930] platform 480c5000.aes: Cannot lookup hwmod
'aes' [   27.758148] omap-aes 480c5000.aes:
_od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[   27.765960] omap-aes 480c5000.aes: omap_aes_probe: failed
to get_sync(-19)
[   29.257690] omap-aes 480c5000.aes: initialization failed.

So it looks like some initialization data are missing for
Nokia N900 (omap3430 device).

Can somebody look at it? I have patched 2.6.28 kernel were
omap aes support on this N900 device (with special
bootloader) is working.

Maybe some other data are missing in DT or in hwmod?

dma channels are missing in DT. I applied this patch:

diff --git a/arch/arm/boot/dts/omap3.dtsi b/arch/arm/boot/dts/omap3.dtsi
index 01b7111..473d460 100644
--- a/arch/arm/boot/dts/omap3.dtsi
+++ b/arch/arm/boot/dts/omap3.dtsi

@@ -92,6 +92,8 @@
 			ti,hwmods = "aes";
 			reg = <0x480c5000 0x50>;
 			interrupts = <0>;
+			dmas = <&sdma 65 &sdma 66>;
+			dma-names = "tx", "rx";
 		};
 
 		prm: prm@48306000 {

@@ -550,6 +552,8 @@
 			ti,hwmods = "sham";
 			reg = <0x480c3000 0x64>;
 			interrupts = <49>;
+			dmas = <&sdma 96>;
+			dma-names = "rx";
 		};
 
 		smartreflex_core: smartreflex@480cb000 {

and omap-aes driver was successfully loaded. now it is in /proc/crypto

I copied dma names and numbers from file arch/arm/mach-omap2/omap_hwmod_3xxx_data.c

-- 
Pali Rohár
pali.rohar@gmail.com