linux-kernel - Re: [PATCH v7 09/21] iommu/mediatek: Refine protect memory definition

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Message-ID: <d5bf7ef9-d6dd-2e09-5ad8-e72a26dd3880@gmail.com>
Date:   Mon, 17 Jun 2019 11:59:22 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Evan Green <evgreen@...omium.org>, Tomasz Figa <tfiga@...gle.com>,
        Will Deacon <will.deacon@....com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, yingjoe.chen@...iatek.com,
        youlin.pei@...iatek.com, Nicolas Boichat <drinkcat@...omium.org>,
        anan.sun@...iatek.com, Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v7 09/21] iommu/mediatek: Refine protect memory definition



On 10/06/2019 14:17, Yong Wu wrote:
> The protect memory setting is a little different in the different SoCs.
> In the register REG_MMU_CTRL_REG(0x110), the TF_PROT(translation fault
> protect) shift bit is normally 4 while it shift 5 bits only in the
> mt8173. This patch delete the complex MACRO and use a common if-else
> instead.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: Evan Green <evgreen@...omium.org>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>  drivers/iommu/mtk_iommu.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index ad838b9..d38dfa2 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -52,12 +52,9 @@
>  #define REG_MMU_DCM_DIS				0x050
>  
>  #define REG_MMU_CTRL_REG			0x110
> +#define F_MMU_TF_PROT_TO_PROGRAM_ADDR		(2 << 4)
>  #define F_MMU_PREFETCH_RT_REPLACE_MOD		BIT(4)
> -#define F_MMU_TF_PROTECT_SEL_SHIFT(data) \
> -	((data)->plat_data->m4u_plat == M4U_MT2712 ? 4 : 5)
> -/* It's named by F_MMU_TF_PROT_SEL in mt2712. */
> -#define F_MMU_TF_PROTECT_SEL(prot, data) \
> -	(((prot) & 0x3) << F_MMU_TF_PROTECT_SEL_SHIFT(data))
> +#define F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173	(2 << 5)
>  
>  #define REG_MMU_IVRP_PADDR			0x114
>  
> @@ -519,9 +516,11 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  		return ret;
>  	}
>  
> -	regval = F_MMU_TF_PROTECT_SEL(2, data);
>  	if (data->plat_data->m4u_plat == M4U_MT8173)
> -		regval |= F_MMU_PREFETCH_RT_REPLACE_MOD;
> +		regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
> +			 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
> +	else
> +		regval = F_MMU_TF_PROT_TO_PROGRAM_ADDR;
>  	writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
>  
>  	regval = F_L2_MULIT_HIT_EN |
>