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Subject: Re: [PATCH v4 02/18] iommu/mediatek: Use a struct as the platform
 data
To:     Yong Wu <yong.wu@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Tomasz Figa <tfiga@google.com>, Will Deacon <will.deacon@arm.com>,
        linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        iommu@lists.linux-foundation.org, arnd@arndb.de,
        yingjoe.chen@mediatek.com, youlin.pei@mediatek.com,
        Nicolas Boichat <drinkcat@chromium.org>,
        Arvind Yadav <arvind.yadav.cs@gmail.com>
References: <1544258371-4600-1-git-send-email-yong.wu@mediatek.com>
 <1544258371-4600-3-git-send-email-yong.wu@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
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Message-ID: <be32c912-359e-73c9-ca24-d0cbface47d3@gmail.com>
Date:   Fri, 21 Dec 2018 18:44:55 +0100
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On 08/12/2018 09:39, Yong Wu wrote:
> Use a struct as the platform special data instead of the enumeration.
> This is a prepare patch for adding mt8183 iommu support.
> 
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> ---

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

>  drivers/iommu/mtk_iommu.c | 24 ++++++++++++++++--------
>  drivers/iommu/mtk_iommu.h |  6 +++++-
>  2 files changed, 21 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 44bd5b9..9a2225b 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -54,7 +54,7 @@
>  #define REG_MMU_CTRL_REG			0x110
>  #define F_MMU_PREFETCH_RT_REPLACE_MOD		BIT(4)
>  #define F_MMU_TF_PROTECT_SEL_SHIFT(data) \
> -	((data)->m4u_plat == M4U_MT2712 ? 4 : 5)
> +	((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))
> @@ -517,7 +517,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  	}
>  
>  	regval = F_MMU_TF_PROTECT_SEL(2, data);
> -	if (data->m4u_plat == M4U_MT8173)
> +	if (data->plat_data->m4u_plat == M4U_MT8173)
>  		regval |= F_MMU_PREFETCH_RT_REPLACE_MOD;
>  	writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
>  
> @@ -538,14 +538,14 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  		F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
>  	writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
>  
> -	if (data->m4u_plat == M4U_MT8173)
> +	if (data->plat_data->m4u_plat == M4U_MT8173)
>  		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
>  	else
>  		regval = lower_32_bits(data->protect_base) |
>  			 upper_32_bits(data->protect_base);
>  	writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR);
>  
> -	if (data->enable_4GB && data->m4u_plat != M4U_MT8173) {
> +	if (data->enable_4GB && data->plat_data->m4u_plat != M4U_MT8173) {
>  		/*
>  		 * If 4GB mode is enabled, the validate PA range is from
>  		 * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30].
> @@ -556,7 +556,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  	writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
>  
>  	/* It's MISC control register whose default value is ok except mt8173.*/
> -	if (data->m4u_plat == M4U_MT8173)
> +	if (data->plat_data->m4u_plat == M4U_MT8173)
>  		writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
>  
>  	if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
> @@ -589,7 +589,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
>  	if (!data)
>  		return -ENOMEM;
>  	data->dev = dev;
> -	data->m4u_plat = (enum mtk_iommu_plat)of_device_get_match_data(dev);
> +	data->plat_data = of_device_get_match_data(dev);
>  
>  	/* Protect memory. HW will access here while translation fault.*/
>  	protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL);
> @@ -733,9 +733,17 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
>  };
>  
> +static const struct mtk_iommu_plat_data mt2712_data = {
> +	.m4u_plat     = M4U_MT2712,
> +};
> +
> +static const struct mtk_iommu_plat_data mt8173_data = {
> +	.m4u_plat     = M4U_MT8173,
> +};
> +
>  static const struct of_device_id mtk_iommu_of_ids[] = {
> -	{ .compatible = "mediatek,mt2712-m4u", .data = (void *)M4U_MT2712},
> -	{ .compatible = "mediatek,mt8173-m4u", .data = (void *)M4U_MT8173},
> +	{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
> +	{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
>  	{}
>  };
>  
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index 778498b..333a0ef 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -41,6 +41,10 @@ enum mtk_iommu_plat {
>  	M4U_MT8173,
>  };
>  
> +struct mtk_iommu_plat_data {
> +	enum mtk_iommu_plat m4u_plat;
> +};
> +
>  struct mtk_iommu_domain;
>  
>  struct mtk_iommu_data {
> @@ -57,7 +61,7 @@ struct mtk_iommu_data {
>  	bool				tlb_flush_active;
>  
>  	struct iommu_device		iommu;
> -	enum mtk_iommu_plat		m4u_plat;
> +	const struct mtk_iommu_plat_data *plat_data;
>  
>  	struct list_head		list;
>  };
>