linux-kernel - Re: [PATCH v7 1/5] ARM: add basic support for Trusted Foundations

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Message-ID: <871u3xdjz8.fsf@linaro.org>
Date:	Mon, 07 Oct 2013 11:16:59 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Dave Martin <Dave.Martin@....com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	<gnurou@...il.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 1/5] ARM: add basic support for Trusted Foundations

Alexandre Courbot <acourbot@...dia.com> writes:

> Trusted Foundations is a TrustZone-based secure monitor for ARM that
> can be invoked using the same SMC-based API on all supported
> platforms. This patch adds initial basic support for Trusted
> Foundations using the ARM firmware API. Current features are limited
> to the ability to boot secondary processors.
>
> Note: The API followed by Trusted Foundations does *not* follow the SMC
> calling conventions. It has nothing to do with PSCI neither and is only
> relevant to devices that use Trusted Foundations (like most Tegra-based
> retail devices).
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> Reviewed-by: Tomasz Figa <t.figa@...sung.com>
> Reviewed-by: Stephen Warren <swarren@...dia.com>

[...]

> +void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
> +{
> +	/* we are not using version information for now since currently
> +	 * supported SMCs are compatible with all TF releases */

nit: multi-line comment style...

[...]

> +static inline void register_trusted_foundations(
> +				   struct trusted_foundations_platform_data *pd)
> +{
> +	/* If we try to register TF, this means the system needs it to continue.
> +	 * Its absence if thus a fatal error. */

...and here...

> +	panic("No support for Trusted Foundations, stopping...\n");
> +}
> +
> +static inline void of_register_trusted_foundations(void)
> +{
> +	/* If we find the target should enable TF but does not support it,
> +	 * fail as the system won't be able to do much anyway */

...and here.

> +	if (of_find_compatible_node(NULL, NULL, "tl,trusted-foundations"))
> +		register_trusted_foundations(NULL);
> +}
> +#endif /* CONFIG_TRUSTED_FOUNDATIONS */
> +
> +#endif

Kevin
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