[PATCH 4/8] ARM: l2x0: add arm,ecc-enable property for aurora

[Gregory CLEMENT]

Hi Jan,
 
 On ven., juin 30 2017, Jan Luebbe <jlu at pengutronix.de> wrote:

> From: Chris Packham <chris.packham at alliedtelesis.co.nz>
>
> The aurora cache on the Marvell Armada-XP SoC supports ECC protection
> for the L2 data arrays. Add a "arm,ecc-enable" device tree property
> which can be used to enable this.
>
> Signed-off-by: Chris Packham <chris.packham at alliedtelesis.co.nz>
> [jlu at pengutronix.de: use aurora specific define AURORA_ACR_ECC_EN]
> Signed-off-by: Jan Luebbe <jlu at pengutronix.de>
> ---
>  Documentation/devicetree/bindings/arm/l2c2x0.txt | 2 ++
>  arch/arm/mm/cache-l2x0.c                         | 7 +++++++
>  2 files changed, 9 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/l2c2x0.txt b/Documentation/devicetree/bindings/arm/l2c2x0.txt
> index d9650c1788f4..6316e673307a 100644
> --- a/Documentation/devicetree/bindings/arm/l2c2x0.txt
> +++ b/Documentation/devicetree/bindings/arm/l2c2x0.txt
> @@ -76,6 +76,8 @@ Optional properties:
>    specified to indicate that such transforms are precluded.
>  - arm,parity-enable : enable parity checking on the L2 cache (L220 or PL310).
>  - arm,parity-disable : disable parity checking on the L2 cache (L220 or PL310).
> +- arm,ecc-enable : enable ECC protection on the L2 cache
> +- arm,ecc-disable : disable ECC protection on the L2 cache
>  - arm,outer-sync-disable : disable the outer sync operation on the L2 cache.
>    Some core tiles, especially ARM PB11MPCore have a faulty L220 cache that
>    will randomly hang unless outer sync operations are disabled.
> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> index b70bee74750d..ea2a3dcc75a9 100644
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -1505,6 +1505,13 @@ static void __init aurora_of_parse(const struct device_node *np,
>  		mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
>  	}
>  
> +	if (of_property_read_bool(np, "arm,ecc-enable")) {
> +		mask |= AURORA_ACR_ECC_EN;
> +		val |= AURORA_ACR_ECC_EN;
> +	} else if (of_property_read_bool(np, "arm,ecc-disable")) {
> +		mask |= AURORA_ACR_ECC_EN;

As pointed by Russell on the previous patch for AURORA_ACR_PARITY_EN,
here again AURORA_ACR_ECC_EN is not declared yet.

Gregory

> +	}
> +
>  	if (of_property_read_bool(np, "arm,parity-enable")) {
>  		mask |= AURORA_ACR_PARITY_EN;
>  		val |= AURORA_ACR_PARITY_EN;
> -- 
> 2.11.0
>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com