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Subject: Re: [PATCH v7 13/21] iommu/mediatek: Add mt8183 IOMMU support
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:     Evan Green <evgreen@chromium.org>, 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, yingjoe.chen@mediatek.com,
        youlin.pei@mediatek.com, Nicolas Boichat <drinkcat@chromium.org>,
        anan.sun@mediatek.com, Matthias Kaehlcke <mka@chromium.org>
References: <1560169080-27134-1-git-send-email-yong.wu@mediatek.com>
 <1560169080-27134-14-git-send-email-yong.wu@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
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Message-ID: <fa54a1a3-d39a-1235-7cee-3fb10593e5ef@gmail.com>
Date:   Mon, 17 Jun 2019 17:51:51 +0200
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On 10/06/2019 14:17, Yong Wu wrote:
> The M4U IP blocks in mt8183 is MediaTek's generation2 M4U which use
> the ARM Short-descriptor like mt8173, and most of the HW registers
> are the same.
> 
> Here list main differences between mt8183 and mt8173/mt2712:
> 1) mt8183 has only one M4U HW like mt8173 while mt2712 has two.
> 2) mt8183 don't have the "bclk" clock, it use the EMI clock instead.
> 3) mt8183 can support the dram over 4GB, but it doesn't call this "4GB
> mode".
> 4) mt8183 pgtable base register(0x0) extend bit[1:0] which represent
> the bit[33:32] in the physical address of the pgtable base, But the
> standard ttbr0[1] means the S bit which is enabled defaultly, Hence,
> we add a mask.
> 5) mt8183 HW has a GALS modules, SMI should enable "has_gals" support.
> 6) mt8183 need reset_axi like mt8173.
> 7) the larb-id in smi-common is remapped. M4U should add its larbid_remap.
> 
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> Reviewed-by: Evan Green <evgreen@chromium.org>

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

> ---
>  drivers/iommu/mtk_iommu.c | 15 ++++++++++++---
>  drivers/iommu/mtk_iommu.h |  1 +
>  drivers/memory/mtk-smi.c  | 20 ++++++++++++++++++++
>  3 files changed, 33 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index a535dcd..3a14301 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -36,6 +36,7 @@
>  #include "mtk_iommu.h"
>  
>  #define REG_MMU_PT_BASE_ADDR			0x000
> +#define MMU_PT_ADDR_MASK			GENMASK(31, 7)
>  
>  #define REG_MMU_INVALIDATE			0x020
>  #define F_ALL_INVLD				0x2
> @@ -341,7 +342,7 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
>  	/* Update the pgtable base address register of the M4U HW */
>  	if (!data->m4u_dom) {
>  		data->m4u_dom = dom;
> -		writel(dom->cfg.arm_v7s_cfg.ttbr[0],
> +		writel(dom->cfg.arm_v7s_cfg.ttbr[0] & MMU_PT_ADDR_MASK,
>  		       data->base + REG_MMU_PT_BASE_ADDR);
>  	}
>  
> @@ -715,6 +716,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  {
>  	struct mtk_iommu_data *data = dev_get_drvdata(dev);
>  	struct mtk_iommu_suspend_reg *reg = &data->reg;
> +	struct mtk_iommu_domain *m4u_dom = data->m4u_dom;
>  	void __iomem *base = data->base;
>  	int ret;
>  
> @@ -730,8 +732,8 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  	writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
>  	writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
>  	writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR);
> -	if (data->m4u_dom)
> -		writel(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
> +	if (m4u_dom)
> +		writel(m4u_dom->cfg.arm_v7s_cfg.ttbr[0] & MMU_PT_ADDR_MASK,
>  		       base + REG_MMU_PT_BASE_ADDR);
>  	return 0;
>  }
> @@ -756,9 +758,16 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  	.larbid_remap = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */
>  };
>  
> +static const struct mtk_iommu_plat_data mt8183_data = {
> +	.m4u_plat     = M4U_MT8183,
> +	.reset_axi    = true,
> +	.larbid_remap = {0, 4, 5, 6, 7, 2, 3, 1},
> +};
> +
>  static const struct of_device_id mtk_iommu_of_ids[] = {
>  	{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
>  	{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
> +	{ .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},
>  	{}
>  };
>  
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index e5c9dde..c0b5c65 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -38,6 +38,7 @@ enum mtk_iommu_plat {
>  	M4U_MT2701,
>  	M4U_MT2712,
>  	M4U_MT8173,
> +	M4U_MT8183,
>  };
>  
>  struct mtk_iommu_plat_data {
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 91634d7..a430721 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -285,6 +285,13 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
>  	.larb_direct_to_common_mask = BIT(8) | BIT(9),      /* bdpsys */
>  };
>  
> +static const struct mtk_smi_larb_gen mtk_smi_larb_mt8183 = {
> +	.has_gals                   = true,
> +	.config_port                = mtk_smi_larb_config_port_gen2_general,
> +	.larb_direct_to_common_mask = BIT(2) | BIT(3) | BIT(7),
> +				      /* IPU0 | IPU1 | CCU */
> +};
> +
>  static const struct of_device_id mtk_smi_larb_of_ids[] = {
>  	{
>  		.compatible = "mediatek,mt8173-smi-larb",
> @@ -298,6 +305,10 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
>  		.compatible = "mediatek,mt2712-smi-larb",
>  		.data = &mtk_smi_larb_mt2712
>  	},
> +	{
> +		.compatible = "mediatek,mt8183-smi-larb",
> +		.data = &mtk_smi_larb_mt8183
> +	},
>  	{}
>  };
>  
> @@ -391,6 +402,11 @@ static int mtk_smi_larb_remove(struct platform_device *pdev)
>  	.gen = MTK_SMI_GEN2,
>  };
>  
> +static const struct mtk_smi_common_plat mtk_smi_common_mt8183 = {
> +	.gen      = MTK_SMI_GEN2,
> +	.has_gals = true,
> +};
> +
>  static const struct of_device_id mtk_smi_common_of_ids[] = {
>  	{
>  		.compatible = "mediatek,mt8173-smi-common",
> @@ -404,6 +420,10 @@ static int mtk_smi_larb_remove(struct platform_device *pdev)
>  		.compatible = "mediatek,mt2712-smi-common",
>  		.data = &mtk_smi_common_gen2,
>  	},
> +	{
> +		.compatible = "mediatek,mt8183-smi-common",
> +		.data = &mtk_smi_common_mt8183,
> +	},
>  	{}
>  };
>  
>