linux-kernel - Re: [PATCH v3 4/7] iommu/mediatek: Move inv_sel_reg into the plat

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Date:   Mon, 25 May 2020 14:22:23 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Chao Hao <chao.hao@...iatek.com>
CC:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <iommu@...ts.linux-foundation.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        FY Yang <fy.yang@...iatek.com>, Jun Yan <jun.yan@...iatek.com>
Subject: Re: [PATCH v3 4/7] iommu/mediatek: Move inv_sel_reg into the
 plat_data

On Sat, 2020-05-09 at 16:36 +0800, Chao Hao wrote:
> For mt6779, MMU_INVLDT_SEL register's offset is changed from

At this patch, the register is still called by "MMU_INV_SEL".

> 0x38 to 0x2c, so we can put inv_sel_reg in the plat_data to
> use it.
> In addition, we renamed it to REG_MMU_INV_SEL_GEN1 and use it
> before mt6779.
> 
> Signed-off-by: Chao Hao <chao.hao@...iatek.com>
> ---
>  drivers/iommu/mtk_iommu.c | 9 ++++++---
>  drivers/iommu/mtk_iommu.h | 1 +
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 9ede327a418d..d73de987f8be 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -37,7 +37,7 @@
>  #define REG_MMU_INVLD_START_A			0x024
>  #define REG_MMU_INVLD_END_A			0x028
>  
> -#define REG_MMU_INV_SEL				0x038
> +#define REG_MMU_INV_SEL_GEN1			0x038
>  #define F_INVLD_EN0				BIT(0)
>  #define F_INVLD_EN1				BIT(1)
>  
> @@ -167,7 +167,7 @@ static void mtk_iommu_tlb_flush_all(void *cookie)
>  
>  	for_each_m4u(data) {
>  		writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
> -			       data->base + REG_MMU_INV_SEL);
> +			       data->base + data->plat_data->inv_sel_reg);
>  		writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
>  		wmb(); /* Make sure the tlb flush all done */
>  	}
> @@ -184,7 +184,7 @@ static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
>  	for_each_m4u(data) {
>  		spin_lock_irqsave(&data->tlb_lock, flags);
>  		writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
> -			       data->base + REG_MMU_INV_SEL);
> +			       data->base + data->plat_data->inv_sel_reg);
>  
>  		writel_relaxed(iova, data->base + REG_MMU_INVLD_START_A);
>  		writel_relaxed(iova + size - 1,
> @@ -784,6 +784,7 @@ static const struct mtk_iommu_plat_data mt2712_data = {
>  	.has_4gb_mode = true,
>  	.has_bclk     = true,
>  	.has_vld_pa_rng   = true,
> +	.inv_sel_reg = REG_MMU_INV_SEL_GEN1,

nitpick: align '=' with the next line.

>  	.larbid_remap = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
>  };
>  
> @@ -792,12 +793,14 @@ static const struct mtk_iommu_plat_data mt8173_data = {
>  	.has_4gb_mode = true,
>  	.has_bclk     = true,
>  	.reset_axi    = true,
> +	.inv_sel_reg = REG_MMU_INV_SEL_GEN1,

align '='

>  	.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,
> +	.inv_sel_reg = REG_MMU_INV_SEL_GEN1,
>  	.larbid_remap = {0, 4, 5, 6, 7, 2, 3, 1},
>  };
>  
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index d711ac630037..afd7a2de5c1e 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -43,6 +43,7 @@ struct mtk_iommu_plat_data {
>  	bool		    has_misc_ctrl;
>  	bool                has_vld_pa_rng;
>  	bool                reset_axi;
> +	u32                 inv_sel_reg;
>  	unsigned char       larbid_remap[MTK_LARB_NR_MAX];
>  };
>