linux-kernel - Re: [PATCH v3 7/7] iommu/mediatek: Add mt6779 basic support

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Date:   Mon, 25 May 2020 14:54:32 +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 7/7] iommu/mediatek: Add mt6779 basic support

On Sat, 2020-05-09 at 16:36 +0800, Chao Hao wrote:
> 1. Start from mt6779, INVLDT_SEL move to offset=0x2c, so we add
>    REG_MMU_INV_SEL_GEN2 definition and mt6779 uses it.
> 2. Change PROTECT_PA_ALIGN from 128 byte to 256 byte.
> 3. For REG_MMU_CTRL_REG register, we only need to change bit[2:0],
>    others bits keep default value, ex: enable victim tlb.
> 4. Add mt6779_data to support mm_iommu HW init.
> 
> Signed-off-by: Chao Hao <chao.hao@...iatek.com>
> ---
>  drivers/iommu/mtk_iommu.c | 18 +++++++++++++++---
>  drivers/iommu/mtk_iommu.h |  1 +
>  2 files changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index dc9ae944e712..34c4ffb77c73 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -37,6 +37,7 @@
>  #define REG_MMU_INVLD_START_A			0x024
>  #define REG_MMU_INVLD_END_A			0x028
>  
> +#define REG_MMU_INV_SEL_GEN2			0x02c
>  #define REG_MMU_INV_SEL_GEN1			0x038

Normally the register name comes from the CODA. In the lasted CODA,
this is called "MMU_INVLDT_SEL". But it's same with the previous 0x38
totally. Using _GEN1, _GEN2 is ok for me. Please add its coda name in
the comment. like:

#define REG_MMU_INV_SEL_GEN2		0x02c /* MMU_INVLDT_SEL */

>  #define F_INVLD_EN0				BIT(0)
>  #define F_INVLD_EN1				BIT(1)
> @@ -97,7 +98,7 @@
>  #define F_MMU_INT_ID_LARB_ID(a)			(((a) >> 7) & 0x7)
>  #define F_MMU_INT_ID_PORT_ID(a)			(((a) >> 2) & 0x1f)
>  
> -#define MTK_PROTECT_PA_ALIGN			128
> +#define MTK_PROTECT_PA_ALIGN			256
>  
>  /*
>   * Get the local arbiter ID and the portid within the larb arbiter
> @@ -554,11 +555,12 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  		return ret;
>  	}
>  
> +	regval = readl_relaxed(data->base + REG_MMU_CTRL_REG);
>  	if (data->plat_data->m4u_plat == M4U_MT8173)
> -		regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
> +		regval |= F_MMU_PREFETCH_RT_REPLACE_MOD |

The default value is not ok for mt8173(Its bit9 is in_order_write_en, we
could not use its default 1'b1). thus, Don't touch this line.

>  			 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
>  	else
> -		regval = F_MMU_TF_PROT_TO_PROGRAM_ADDR;
> +		regval |= F_MMU_TF_PROT_TO_PROGRAM_ADDR;
>  	writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
>  
>  	regval = F_L2_MULIT_HIT_EN |
> @@ -804,6 +806,15 @@ static const struct mtk_iommu_plat_data mt2712_data = {
>  	.larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}},
>  };
>  
> +static const struct mtk_iommu_plat_data mt6779_data = {
> +	.m4u_plat = M4U_MT6779,
> +	.larbid_remap = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}},
> +	.has_sub_comm = true,
> +	.has_wr_len = true,
> +	.has_misc_ctrl = true,
> +	.inv_sel_reg = REG_MMU_INV_SEL_GEN2,

align '=' a bit.

> +};
> +
>  static const struct mtk_iommu_plat_data mt8173_data = {
>  	.m4u_plat     = M4U_MT8173,
>  	.has_4gb_mode = true,
> @@ -822,6 +833,7 @@ static const struct mtk_iommu_plat_data mt8183_data = {
>  
>  static const struct of_device_id mtk_iommu_of_ids[] = {
>  	{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
> +	{ .compatible = "mediatek,mt6779-m4u", .data = &mt6779_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 9971cedd72ea..fb79e710c8d9 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -31,6 +31,7 @@ struct mtk_iommu_suspend_reg {
>  enum mtk_iommu_plat {
>  	M4U_MT2701,
>  	M4U_MT2712,
> +	M4U_MT6779,
>  	M4U_MT8173,
>  	M4U_MT8183,
>  };