Re: [RFC] ARM: omap3: Enable HWMODS for HW Random Number Generator

From: "Pali Rohár" <pali.rohar@gmail.com>
To: Adam Ford <aford173@gmail.com>
Cc: "Mark Rutland" <mark.rutland@arm.com>,
	devicetree <devicetree@vger.kernel.org>,
	"Paul Walmsley" <paul@pwsan.com>,
	"Aaro Koskinen" <aaro.koskinen@iki.fi>,
	"Tony Lindgren" <tony@atomide.com>,
	"Russell King" <linux@armlinux.org.uk>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Tero Kristo" <t-kristo@ti.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Benoît Cousson" <bcousson@baylibre.com>,
	Linux-OMAP <linux-omap@vger.kernel.org>,
	"Adam Ford" <adam.ford@logicpd.com>,
	arm-soc <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC] ARM: omap3: Enable HWMODS for HW Random Number Generator
Date: Tue, 10 Sep 2019 18:39:06 +0200	[thread overview]
Message-ID: <20190910163906.ypyeaido6h4nurvv@pali> (raw)
In-Reply-To: <CAHCN7xLaGQMM67VC-2_G8XC7UuG4c+TbbYb4z=ibJwZsQF4YVw@mail.gmail.com>

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On Tuesday 10 September 2019 11:21:34 Adam Ford wrote:
> According to a note in omap_hwmod_3xxx_data.c,
> 
> /*
>  * Apparently the SHA/MD5 and AES accelerator IP blocks are
>  * only present on some AM35xx chips, and no one knows which
>  * ones.  See
>  * http://www.spinics.net/lists/arm-kernel/msg215466.html So
>  * if you need these IP blocks on an AM35xx, try uncommenting
>  * the following lines.
>  */
> 
> I decided to uncomment the hwmod entries, and I got the following:
> 
> [    0.263222] omap_hwmod: sham: _wait_target_ready failed: -16
> [    0.263248] omap_hwmod: sham: cannot be enabled for reset (3)
> [    0.265837] omap_hwmod: aes: _wait_target_ready failed: -16
> [    0.265851] omap_hwmod: aes: cannot be enabled for reset (3)
> [    6.208866] omap_hwmod: sham: _wait_target_ready failed: -16
> [    6.287732] omap_hwmod: aes: _wait_target_ready failed: -16

Hi! Same errors I got in qemu-n900, but not on real N900. So I guess
those errors means that IP blocks are not present.

> Based on this, I wonder if the sham and aes modules are not present.
> If this is the case, it might explain why I cannot use the rng either.

Probably this is the reason, you do not have crypto/rng HW engine.

-- 
Pali Rohár
pali.rohar@gmail.com

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