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w18sm9398387wru.54.2018.12.21.09.44.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 21 Dec 2018 09:44:56 -0800 (PST) Subject: Re: [PATCH v4 02/18] iommu/mediatek: Use a struct as the platform data To: Yong Wu , Joerg Roedel , Robin Murphy , Rob Herring Cc: Tomasz Figa , Will Deacon , 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 , Arvind Yadav References: <1544258371-4600-1-git-send-email-yong.wu@mediatek.com> <1544258371-4600-3-git-send-email-yong.wu@mediatek.com> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa 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<1544258371-4600-3-git-send-email-yong.wu@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > --- Reviewed-by: Matthias Brugger > 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; > }; >